net/tls/tls_main.c

   1 /*
   2  * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
   3  * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/module.h>
  35
  36 #include <net/tcp.h>
  37 #include <net/inet_common.h>
  38 #include <linux/highmem.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/sched/signal.h>
  41 #include <linux/inetdevice.h>
  42
  43 #include <net/tls.h>
  44
  45 MODULE_AUTHOR("Mellanox Technologies");
  46 MODULE_DESCRIPTION("Transport Layer Security Support");
  47 MODULE_LICENSE("Dual BSD/GPL");
  48 MODULE_ALIAS_TCP_ULP("tls");
  49
  50 enum {
  51         TLSV4,
  52         TLSV6,
  53         TLS_NUM_PROTS,
  54 };
  55
  56 static struct proto *saved_tcpv6_prot;
  57 static DEFINE_MUTEX(tcpv6_prot_mutex);
  58 static struct proto *saved_tcpv4_prot;
  59 static DEFINE_MUTEX(tcpv4_prot_mutex);
  60 static LIST_HEAD(device_list);
  61 static DEFINE_SPINLOCK(device_spinlock);
  62 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  63 static struct proto_ops tls_sw_proto_ops;
  64 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
  65                          struct proto *base);
  66
  67 static void update_sk_prot(struct sock *sk, struct tls_context *ctx)
  68 {
  69         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
  70
  71         sk->sk_prot = &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf];
  72 }
  73
  74 int wait_on_pending_writer(struct sock *sk, long *timeo)
  75 {
  76         int rc = 0;
  77         DEFINE_WAIT_FUNC(wait, woken_wake_function);
  78
  79         add_wait_queue(sk_sleep(sk), &wait);
  80         while (1) {
  81                 if (!*timeo) {
  82                         rc = -EAGAIN;
  83                         break;
  84                 }
  85
  86                 if (signal_pending(current)) {
  87                         rc = sock_intr_errno(*timeo);
  88                         break;
  89                 }
  90
  91                 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
  92                         break;
  93         }
  94         remove_wait_queue(sk_sleep(sk), &wait);
  95         return rc;
  96 }
  97
  98 int tls_push_sg(struct sock *sk,
  99                 struct tls_context *ctx,
 100                 struct scatterlist *sg,
 101                 u16 first_offset,
 102                 int flags)
 103 {
 104         int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
 105         int ret = 0;
 106         struct page *p;
 107         size_t size;
 108         int offset = first_offset;
 109
 110         size = sg->length - offset;
 111         offset += sg->offset;
 112
 113         ctx->in_tcp_sendpages = true;
 114         while (1) {
 115                 if (sg_is_last(sg))
 116                         sendpage_flags = flags;
 117
 118                 /* is sending application-limited? */
 119                 tcp_rate_check_app_limited(sk);
 120                 p = sg_page(sg);
 121 retry:
 122                 ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);
 123
 124                 if (ret != size) {
 125                         if (ret > 0) {
 126                                 offset += ret;
 127                                 size -= ret;
 128                                 goto retry;
 129                         }
 130
 131                         offset -= sg->offset;
 132                         ctx->partially_sent_offset = offset;
 133                         ctx->partially_sent_record = (void *)sg;
 134                         ctx->in_tcp_sendpages = false;
 135                         return ret;
 136                 }
 137
 138                 put_page(p);
 139                 sk_mem_uncharge(sk, sg->length);
 140                 sg = sg_next(sg);
 141                 if (!sg)
 142                         break;
 143
 144                 offset = sg->offset;
 145                 size = sg->length;
 146         }
 147
 148         ctx->in_tcp_sendpages = false;
 149
 150         return 0;
 151 }
 152
 153 static int tls_handle_open_record(struct sock *sk, int flags)
 154 {
 155         struct tls_context *ctx = tls_get_ctx(sk);
 156
 157         if (tls_is_pending_open_record(ctx))
 158                 return ctx->push_pending_record(sk, flags);
 159
 160         return 0;
 161 }
 162
 163 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
 164                       unsigned char *record_type)
 165 {
 166         struct cmsghdr *cmsg;
 167         int rc = -EINVAL;
 168
 169         for_each_cmsghdr(cmsg, msg) {
 170                 if (!CMSG_OK(msg, cmsg))
 171                         return -EINVAL;
 172                 if (cmsg->cmsg_level != SOL_TLS)
 173                         continue;
 174
 175                 switch (cmsg->cmsg_type) {
 176                 case TLS_SET_RECORD_TYPE:
 177                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 178                                 return -EINVAL;
 179
 180                         if (msg->msg_flags & MSG_MORE)
 181                                 return -EINVAL;
 182
 183                         rc = tls_handle_open_record(sk, msg->msg_flags);
 184                         if (rc)
 185                                 return rc;
 186
 187                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 188                         rc = 0;
 189                         break;
 190                 default:
 191                         return -EINVAL;
 192                 }
 193         }
 194
 195         return rc;
 196 }
 197
 198 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 199                             int flags)
 200 {
 201         struct scatterlist *sg;
 202         u16 offset;
 203
 204         sg = ctx->partially_sent_record;
 205         offset = ctx->partially_sent_offset;
 206
 207         ctx->partially_sent_record = NULL;
 208         return tls_push_sg(sk, ctx, sg, offset, flags);
 209 }
 210
 211 bool tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
 212 {
 213         struct scatterlist *sg;
 214
 215         sg = ctx->partially_sent_record;
 216         if (!sg)
 217                 return false;
 218
 219         while (1) {
 220                 put_page(sg_page(sg));
 221                 sk_mem_uncharge(sk, sg->length);
 222
 223                 if (sg_is_last(sg))
 224                         break;
 225                 sg++;
 226         }
 227         ctx->partially_sent_record = NULL;
 228         return true;
 229 }
 230
 231 static void tls_write_space(struct sock *sk)
 232 {
 233         struct tls_context *ctx = tls_get_ctx(sk);
 234
 235         /* If in_tcp_sendpages call lower protocol write space handler
 236          * to ensure we wake up any waiting operations there. For example
 237          * if do_tcp_sendpages where to call sk_wait_event.
 238          */
 239         if (ctx->in_tcp_sendpages) {
 240                 ctx->sk_write_space(sk);
 241                 return;
 242         }
 243
 244 #ifdef CONFIG_TLS_DEVICE
 245         if (ctx->tx_conf == TLS_HW)
 246                 tls_device_write_space(sk, ctx);
 247         else
 248 #endif
 249                 tls_sw_write_space(sk, ctx);
 250
 251         ctx->sk_write_space(sk);
 252 }
 253
 254 /**
 255  * tls_ctx_free() - free TLS ULP context
 256  * @sk:  socket to with @ctx is attached
 257  * @ctx: TLS context structure
 258  *
 259  * Free TLS context. If @sk is %NULL caller guarantees that the socket
 260  * to which @ctx was attached has no outstanding references.
 261  */
 262 void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
 263 {
 264         if (!ctx)
 265                 return;
 266
 267         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 268         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 269
 270         if (sk)
 271                 kfree_rcu(ctx, rcu);
 272         else
 273                 kfree(ctx);
 274 }
 275
 276 static void tls_sk_proto_cleanup(struct sock *sk,
 277                                  struct tls_context *ctx, long timeo)
 278 {
 279         if (unlikely(sk->sk_write_pending) &&
 280             !wait_on_pending_writer(sk, &timeo))
 281                 tls_handle_open_record(sk, 0);
 282
 283         /* We need these for tls_sw_fallback handling of other packets */
 284         if (ctx->tx_conf == TLS_SW) {
 285                 kfree(ctx->tx.rec_seq);
 286                 kfree(ctx->tx.iv);
 287                 tls_sw_release_resources_tx(sk);
 288 #ifdef CONFIG_TLS_DEVICE
 289         } else if (ctx->tx_conf == TLS_HW) {
 290                 tls_device_free_resources_tx(sk);
 291 #endif
 292         }
 293
 294         if (ctx->rx_conf == TLS_SW)
 295                 tls_sw_release_resources_rx(sk);
 296
 297 #ifdef CONFIG_TLS_DEVICE
 298         if (ctx->rx_conf == TLS_HW)
 299                 tls_device_offload_cleanup_rx(sk);
 300 #endif
 301 }
 302
 303 static void tls_sk_proto_close(struct sock *sk, long timeout)
 304 {
 305         struct inet_connection_sock *icsk = inet_csk(sk);
 306         struct tls_context *ctx = tls_get_ctx(sk);
 307         long timeo = sock_sndtimeo(sk, 0);
 308         bool free_ctx;
 309
 310         if (ctx->tx_conf == TLS_SW)
 311                 tls_sw_cancel_work_tx(ctx);
 312
 313         lock_sock(sk);
 314         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 315
 316         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 317                 tls_sk_proto_cleanup(sk, ctx, timeo);
 318
 319         write_lock_bh(&sk->sk_callback_lock);
 320         if (free_ctx)
 321                 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 322         sk->sk_prot = ctx->sk_proto;
 323         if (sk->sk_write_space == tls_write_space)
 324                 sk->sk_write_space = ctx->sk_write_space;
 325         write_unlock_bh(&sk->sk_callback_lock);
 326         release_sock(sk);
 327         if (ctx->tx_conf == TLS_SW)
 328                 tls_sw_free_ctx_tx(ctx);
 329         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 330                 tls_sw_strparser_done(ctx);
 331         if (ctx->rx_conf == TLS_SW)
 332                 tls_sw_free_ctx_rx(ctx);
 333         ctx->sk_proto_close(sk, timeout);
 334
 335         if (free_ctx)
 336                 tls_ctx_free(sk, ctx);
 337 }
 338
 339 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 340                                 int __user *optlen)
 341 {
 342         int rc = 0;
 343         struct tls_context *ctx = tls_get_ctx(sk);
 344         struct tls_crypto_info *crypto_info;
 345         int len;
 346
 347         if (get_user(len, optlen))
 348                 return -EFAULT;
 349
 350         if (!optval || (len < sizeof(*crypto_info))) {
 351                 rc = -EINVAL;
 352                 goto out;
 353         }
 354
 355         if (!ctx) {
 356                 rc = -EBUSY;
 357                 goto out;
 358         }
 359
 360         /* get user crypto info */
 361         crypto_info = &ctx->crypto_send.info;
 362
 363         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 364                 rc = -EBUSY;
 365                 goto out;
 366         }
 367
 368         if (len == sizeof(*crypto_info)) {
 369                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 370                         rc = -EFAULT;
 371                 goto out;
 372         }
 373
 374         switch (crypto_info->cipher_type) {
 375         case TLS_CIPHER_AES_GCM_128: {
 376                 struct tls12_crypto_info_aes_gcm_128 *
 377                   crypto_info_aes_gcm_128 =
 378                   container_of(crypto_info,
 379                                struct tls12_crypto_info_aes_gcm_128,
 380                                info);
 381
 382                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 383                         rc = -EINVAL;
 384                         goto out;
 385                 }
 386                 lock_sock(sk);
 387                 memcpy(crypto_info_aes_gcm_128->iv,
 388                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 389                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 390                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 391                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 392                 release_sock(sk);
 393                 if (copy_to_user(optval,
 394                                  crypto_info_aes_gcm_128,
 395                                  sizeof(*crypto_info_aes_gcm_128)))
 396                         rc = -EFAULT;
 397                 break;
 398         }
 399         case TLS_CIPHER_AES_GCM_256: {
 400                 struct tls12_crypto_info_aes_gcm_256 *
 401                   crypto_info_aes_gcm_256 =
 402                   container_of(crypto_info,
 403                                struct tls12_crypto_info_aes_gcm_256,
 404                                info);
 405
 406                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 407                         rc = -EINVAL;
 408                         goto out;
 409                 }
 410                 lock_sock(sk);
 411                 memcpy(crypto_info_aes_gcm_256->iv,
 412                        ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 413                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 414                 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq,
 415                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 416                 release_sock(sk);
 417                 if (copy_to_user(optval,
 418                                  crypto_info_aes_gcm_256,
 419                                  sizeof(*crypto_info_aes_gcm_256)))
 420                         rc = -EFAULT;
 421                 break;
 422         }
 423         default:
 424                 rc = -EINVAL;
 425         }
 426
 427 out:
 428         return rc;
 429 }
 430
 431 static int do_tls_getsockopt(struct sock *sk, int optname,
 432                              char __user *optval, int __user *optlen)
 433 {
 434         int rc = 0;
 435
 436         switch (optname) {
 437         case TLS_TX:
 438                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 439                 break;
 440         default:
 441                 rc = -ENOPROTOOPT;
 442                 break;
 443         }
 444         return rc;
 445 }
 446
 447 static int tls_getsockopt(struct sock *sk, int level, int optname,
 448                           char __user *optval, int __user *optlen)
 449 {
 450         struct tls_context *ctx = tls_get_ctx(sk);
 451
 452         if (level != SOL_TLS)
 453                 return ctx->getsockopt(sk, level, optname, optval, optlen);
 454
 455         return do_tls_getsockopt(sk, optname, optval, optlen);
 456 }
 457
 458 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 459                                   unsigned int optlen, int tx)
 460 {
 461         struct tls_crypto_info *crypto_info;
 462         struct tls_crypto_info *alt_crypto_info;
 463         struct tls_context *ctx = tls_get_ctx(sk);
 464         size_t optsize;
 465         int rc = 0;
 466         int conf;
 467
 468         if (!optval || (optlen < sizeof(*crypto_info))) {
 469                 rc = -EINVAL;
 470                 goto out;
 471         }
 472
 473         if (tx) {
 474                 crypto_info = &ctx->crypto_send.info;
 475                 alt_crypto_info = &ctx->crypto_recv.info;
 476         } else {
 477                 crypto_info = &ctx->crypto_recv.info;
 478                 alt_crypto_info = &ctx->crypto_send.info;
 479         }
 480
 481         /* Currently we don't support set crypto info more than one time */
 482         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 483                 rc = -EBUSY;
 484                 goto out;
 485         }
 486
 487         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 488         if (rc) {
 489                 rc = -EFAULT;
 490                 goto err_crypto_info;
 491         }
 492
 493         /* check version */
 494         if (crypto_info->version != TLS_1_2_VERSION &&
 495             crypto_info->version != TLS_1_3_VERSION) {
 496                 rc = -ENOTSUPP;
 497                 goto err_crypto_info;
 498         }
 499
 500         /* Ensure that TLS version and ciphers are same in both directions */
 501         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 502                 if (alt_crypto_info->version != crypto_info->version ||
 503                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 504                         rc = -EINVAL;
 505                         goto err_crypto_info;
 506                 }
 507         }
 508
 509         switch (crypto_info->cipher_type) {
 510         case TLS_CIPHER_AES_GCM_128:
 511                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 512                 break;
 513         case TLS_CIPHER_AES_GCM_256: {
 514                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 515                 break;
 516         }
 517         case TLS_CIPHER_AES_CCM_128:
 518                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 519                 break;
 520         default:
 521                 rc = -EINVAL;
 522                 goto err_crypto_info;
 523         }
 524
 525         if (optlen != optsize) {
 526                 rc = -EINVAL;
 527                 goto err_crypto_info;
 528         }
 529
 530         rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 531                             optlen - sizeof(*crypto_info));
 532         if (rc) {
 533                 rc = -EFAULT;
 534                 goto err_crypto_info;
 535         }
 536
 537         if (tx) {
 538 #ifdef CONFIG_TLS_DEVICE
 539                 rc = tls_set_device_offload(sk, ctx);
 540                 conf = TLS_HW;
 541                 if (rc) {
 542 #else
 543                 {
 544 #endif
 545                         rc = tls_set_sw_offload(sk, ctx, 1);
 546                         if (rc)
 547                                 goto err_crypto_info;
 548                         conf = TLS_SW;
 549                 }
 550         } else {
 551 #ifdef CONFIG_TLS_DEVICE
 552                 rc = tls_set_device_offload_rx(sk, ctx);
 553                 conf = TLS_HW;
 554                 if (rc) {
 555 #else
 556                 {
 557 #endif
 558                         rc = tls_set_sw_offload(sk, ctx, 0);
 559                         if (rc)
 560                                 goto err_crypto_info;
 561                         conf = TLS_SW;
 562                 }
 563                 tls_sw_strparser_arm(sk, ctx);
 564         }
 565
 566         if (tx)
 567                 ctx->tx_conf = conf;
 568         else
 569                 ctx->rx_conf = conf;
 570         update_sk_prot(sk, ctx);
 571         if (tx) {
 572                 ctx->sk_write_space = sk->sk_write_space;
 573                 sk->sk_write_space = tls_write_space;
 574         } else {
 575                 sk->sk_socket->ops = &tls_sw_proto_ops;
 576         }
 577         goto out;
 578
 579 err_crypto_info:
 580         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 581 out:
 582         return rc;
 583 }
 584
 585 static int do_tls_setsockopt(struct sock *sk, int optname,
 586                              char __user *optval, unsigned int optlen)
 587 {
 588         int rc = 0;
 589
 590         switch (optname) {
 591         case TLS_TX:
 592         case TLS_RX:
 593                 lock_sock(sk);
 594                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 595                                             optname == TLS_TX);
 596                 release_sock(sk);
 597                 break;
 598         default:
 599                 rc = -ENOPROTOOPT;
 600                 break;
 601         }
 602         return rc;
 603 }
 604
 605 static int tls_setsockopt(struct sock *sk, int level, int optname,
 606                           char __user *optval, unsigned int optlen)
 607 {
 608         struct tls_context *ctx = tls_get_ctx(sk);
 609
 610         if (level != SOL_TLS)
 611                 return ctx->setsockopt(sk, level, optname, optval, optlen);
 612
 613         return do_tls_setsockopt(sk, optname, optval, optlen);
 614 }
 615
 616 static struct tls_context *create_ctx(struct sock *sk)
 617 {
 618         struct inet_connection_sock *icsk = inet_csk(sk);
 619         struct tls_context *ctx;
 620
 621         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 622         if (!ctx)
 623                 return NULL;
 624
 625         rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 626         ctx->setsockopt = sk->sk_prot->setsockopt;
 627         ctx->getsockopt = sk->sk_prot->getsockopt;
 628         ctx->sk_proto_close = sk->sk_prot->close;
 629         ctx->unhash = sk->sk_prot->unhash;
 630         return ctx;
 631 }
 632
 633 static void tls_build_proto(struct sock *sk)
 634 {
 635         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 636
 637         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 638         if (ip_ver == TLSV6 &&
 639             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 640                 mutex_lock(&tcpv6_prot_mutex);
 641                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 642                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 643                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 644                 }
 645                 mutex_unlock(&tcpv6_prot_mutex);
 646         }
 647
 648         if (ip_ver == TLSV4 &&
 649             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) {
 650                 mutex_lock(&tcpv4_prot_mutex);
 651                 if (likely(sk->sk_prot != saved_tcpv4_prot)) {
 652                         build_protos(tls_prots[TLSV4], sk->sk_prot);
 653                         smp_store_release(&saved_tcpv4_prot, sk->sk_prot);
 654                 }
 655                 mutex_unlock(&tcpv4_prot_mutex);
 656         }
 657 }
 658
 659 static void tls_hw_sk_destruct(struct sock *sk)
 660 {
 661         struct tls_context *ctx = tls_get_ctx(sk);
 662         struct inet_connection_sock *icsk = inet_csk(sk);
 663
 664         ctx->sk_destruct(sk);
 665         /* Free ctx */
 666         rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 667         tls_ctx_free(sk, ctx);
 668 }
 669
 670 static int tls_hw_prot(struct sock *sk)
 671 {
 672         struct tls_context *ctx;
 673         struct tls_device *dev;
 674         int rc = 0;
 675
 676         spin_lock_bh(&device_spinlock);
 677         list_for_each_entry(dev, &device_list, dev_list) {
 678                 if (dev->feature && dev->feature(dev)) {
 679                         ctx = create_ctx(sk);
 680                         if (!ctx)
 681                                 goto out;
 682
 683                         spin_unlock_bh(&device_spinlock);
 684                         tls_build_proto(sk);
 685                         ctx->hash = sk->sk_prot->hash;
 686                         ctx->unhash = sk->sk_prot->unhash;
 687                         ctx->sk_proto_close = sk->sk_prot->close;
 688                         ctx->sk_destruct = sk->sk_destruct;
 689                         sk->sk_destruct = tls_hw_sk_destruct;
 690                         ctx->rx_conf = TLS_HW_RECORD;
 691                         ctx->tx_conf = TLS_HW_RECORD;
 692                         update_sk_prot(sk, ctx);
 693                         spin_lock_bh(&device_spinlock);
 694                         rc = 1;
 695                         break;
 696                 }
 697         }
 698 out:
 699         spin_unlock_bh(&device_spinlock);
 700         return rc;
 701 }
 702
 703 static void tls_hw_unhash(struct sock *sk)
 704 {
 705         struct tls_context *ctx = tls_get_ctx(sk);
 706         struct tls_device *dev;
 707
 708         spin_lock_bh(&device_spinlock);
 709         list_for_each_entry(dev, &device_list, dev_list) {
 710                 if (dev->unhash) {
 711                         kref_get(&dev->kref);
 712                         spin_unlock_bh(&device_spinlock);
 713                         dev->unhash(dev, sk);
 714                         kref_put(&dev->kref, dev->release);
 715                         spin_lock_bh(&device_spinlock);
 716                 }
 717         }
 718         spin_unlock_bh(&device_spinlock);
 719         ctx->unhash(sk);
 720 }
 721
 722 static int tls_hw_hash(struct sock *sk)
 723 {
 724         struct tls_context *ctx = tls_get_ctx(sk);
 725         struct tls_device *dev;
 726         int err;
 727
 728         err = ctx->hash(sk);
 729         spin_lock_bh(&device_spinlock);
 730         list_for_each_entry(dev, &device_list, dev_list) {
 731                 if (dev->hash) {
 732                         kref_get(&dev->kref);
 733                         spin_unlock_bh(&device_spinlock);
 734                         err |= dev->hash(dev, sk);
 735                         kref_put(&dev->kref, dev->release);
 736                         spin_lock_bh(&device_spinlock);
 737                 }
 738         }
 739         spin_unlock_bh(&device_spinlock);
 740
 741         if (err)
 742                 tls_hw_unhash(sk);
 743         return err;
 744 }
 745
 746 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 747                          struct proto *base)
 748 {
 749         prot[TLS_BASE][TLS_BASE] = *base;
 750         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 751         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 752         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 753
 754         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 755         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 756         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 757
 758         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 759         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 760         prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read;
 761         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 762
 763         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 764         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 765         prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read;
 766         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 767
 768 #ifdef CONFIG_TLS_DEVICE
 769         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 770         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 771         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 772
 773         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 774         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 775         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 776
 777         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 778
 779         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 780
 781         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 782 #endif
 783
 784         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 785         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_hw_hash;
 786         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_hw_unhash;
 787 }
 788
 789 static int tls_init(struct sock *sk)
 790 {
 791         struct tls_context *ctx;
 792         int rc = 0;
 793
 794         if (tls_hw_prot(sk))
 795                 return 0;
 796
 797         /* The TLS ulp is currently supported only for TCP sockets
 798          * in ESTABLISHED state.
 799          * Supporting sockets in LISTEN state will require us
 800          * to modify the accept implementation to clone rather then
 801          * share the ulp context.
 802          */
 803         if (sk->sk_state != TCP_ESTABLISHED)
 804                 return -ENOTSUPP;
 805
 806         tls_build_proto(sk);
 807
 808         /* allocate tls context */
 809         write_lock_bh(&sk->sk_callback_lock);
 810         ctx = create_ctx(sk);
 811         if (!ctx) {
 812                 rc = -ENOMEM;
 813                 goto out;
 814         }
 815
 816         ctx->tx_conf = TLS_BASE;
 817         ctx->rx_conf = TLS_BASE;
 818         ctx->sk_proto = sk->sk_prot;
 819         update_sk_prot(sk, ctx);
 820 out:
 821         write_unlock_bh(&sk->sk_callback_lock);
 822         return rc;
 823 }
 824
 825 static void tls_update(struct sock *sk, struct proto *p)
 826 {
 827         struct tls_context *ctx;
 828
 829         ctx = tls_get_ctx(sk);
 830         if (likely(ctx)) {
 831                 ctx->sk_proto_close = p->close;
 832                 ctx->sk_proto = p;
 833         } else {
 834                 sk->sk_prot = p;
 835         }
 836 }
 837
 838 void tls_register_device(struct tls_device *device)
 839 {
 840         spin_lock_bh(&device_spinlock);
 841         list_add_tail(&device->dev_list, &device_list);
 842         spin_unlock_bh(&device_spinlock);
 843 }
 844 EXPORT_SYMBOL(tls_register_device);
 845
 846 void tls_unregister_device(struct tls_device *device)
 847 {
 848         spin_lock_bh(&device_spinlock);
 849         list_del(&device->dev_list);
 850         spin_unlock_bh(&device_spinlock);
 851 }
 852 EXPORT_SYMBOL(tls_unregister_device);
 853
 854 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 855         .name                   = "tls",
 856         .owner                  = THIS_MODULE,
 857         .init                   = tls_init,
 858         .update                 = tls_update,
 859 };
 860
 861 static int __init tls_register(void)
 862 {
 863         tls_sw_proto_ops = inet_stream_ops;
 864         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 865
 866 #ifdef CONFIG_TLS_DEVICE
 867         tls_device_init();
 868 #endif
 869         tcp_register_ulp(&tcp_tls_ulp_ops);
 870
 871         return 0;
 872 }
 873
 874 static void __exit tls_unregister(void)
 875 {
 876         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 877 #ifdef CONFIG_TLS_DEVICE
 878         tls_device_cleanup();
 879 #endif
 880 }
 881
 882 module_init(tls_register);
 883 module_exit(tls_unregister);