net/tls/tls_main.c

   1 /*
   2  * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
   3  * Copyright (c) 2016-2017, Dave Watson <[email protected]>. 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 struct proto *saved_tcpv6_prot;
  60 static DEFINE_MUTEX(tcpv6_prot_mutex);
  61 static 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                          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         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 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
 213 {
 214         struct scatterlist *sg;
 215
 216         for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
 217                 put_page(sg_page(sg));
 218                 sk_mem_uncharge(sk, sg->length);
 219         }
 220         ctx->partially_sent_record = NULL;
 221 }
 222
 223 static void tls_write_space(struct sock *sk)
 224 {
 225         struct tls_context *ctx = tls_get_ctx(sk);
 226
 227         /* If in_tcp_sendpages call lower protocol write space handler
 228          * to ensure we wake up any waiting operations there. For example
 229          * if do_tcp_sendpages where to call sk_wait_event.
 230          */
 231         if (ctx->in_tcp_sendpages) {
 232                 ctx->sk_write_space(sk);
 233                 return;
 234         }
 235
 236 #ifdef CONFIG_TLS_DEVICE
 237         if (ctx->tx_conf == TLS_HW)
 238                 tls_device_write_space(sk, ctx);
 239         else
 240 #endif
 241                 tls_sw_write_space(sk, ctx);
 242
 243         ctx->sk_write_space(sk);
 244 }
 245
 246 /**
 247  * tls_ctx_free() - free TLS ULP context
 248  * @sk:  socket to with @ctx is attached
 249  * @ctx: TLS context structure
 250  *
 251  * Free TLS context. If @sk is %NULL caller guarantees that the socket
 252  * to which @ctx was attached has no outstanding references.
 253  */
 254 void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
 255 {
 256         if (!ctx)
 257                 return;
 258
 259         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 260         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 261         mutex_destroy(&ctx->tx_lock);
 262
 263         if (sk)
 264                 kfree_rcu(ctx, rcu);
 265         else
 266                 kfree(ctx);
 267 }
 268
 269 static void tls_sk_proto_cleanup(struct sock *sk,
 270                                  struct tls_context *ctx, long timeo)
 271 {
 272         if (unlikely(sk->sk_write_pending) &&
 273             !wait_on_pending_writer(sk, &timeo))
 274                 tls_handle_open_record(sk, 0);
 275
 276         /* We need these for tls_sw_fallback handling of other packets */
 277         if (ctx->tx_conf == TLS_SW) {
 278                 kfree(ctx->tx.rec_seq);
 279                 kfree(ctx->tx.iv);
 280                 tls_sw_release_resources_tx(sk);
 281                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 282         } else if (ctx->tx_conf == TLS_HW) {
 283                 tls_device_free_resources_tx(sk);
 284                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 285         }
 286
 287         if (ctx->rx_conf == TLS_SW) {
 288                 tls_sw_release_resources_rx(sk);
 289                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 290         } else if (ctx->rx_conf == TLS_HW) {
 291                 tls_device_offload_cleanup_rx(sk);
 292                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 293         }
 294 }
 295
 296 static void tls_sk_proto_close(struct sock *sk, long timeout)
 297 {
 298         struct inet_connection_sock *icsk = inet_csk(sk);
 299         struct tls_context *ctx = tls_get_ctx(sk);
 300         long timeo = sock_sndtimeo(sk, 0);
 301         bool free_ctx;
 302
 303         if (ctx->tx_conf == TLS_SW)
 304                 tls_sw_cancel_work_tx(ctx);
 305
 306         lock_sock(sk);
 307         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 308
 309         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 310                 tls_sk_proto_cleanup(sk, ctx, timeo);
 311
 312         write_lock_bh(&sk->sk_callback_lock);
 313         if (free_ctx)
 314                 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 315         sk->sk_prot = ctx->sk_proto;
 316         if (sk->sk_write_space == tls_write_space)
 317                 sk->sk_write_space = ctx->sk_write_space;
 318         write_unlock_bh(&sk->sk_callback_lock);
 319         release_sock(sk);
 320         if (ctx->tx_conf == TLS_SW)
 321                 tls_sw_free_ctx_tx(ctx);
 322         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 323                 tls_sw_strparser_done(ctx);
 324         if (ctx->rx_conf == TLS_SW)
 325                 tls_sw_free_ctx_rx(ctx);
 326         ctx->sk_proto->close(sk, timeout);
 327
 328         if (free_ctx)
 329                 tls_ctx_free(sk, ctx);
 330 }
 331
 332 static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 333                                 int __user *optlen)
 334 {
 335         int rc = 0;
 336         struct tls_context *ctx = tls_get_ctx(sk);
 337         struct tls_crypto_info *crypto_info;
 338         int len;
 339
 340         if (get_user(len, optlen))
 341                 return -EFAULT;
 342
 343         if (!optval || (len < sizeof(*crypto_info))) {
 344                 rc = -EINVAL;
 345                 goto out;
 346         }
 347
 348         if (!ctx) {
 349                 rc = -EBUSY;
 350                 goto out;
 351         }
 352
 353         /* get user crypto info */
 354         crypto_info = &ctx->crypto_send.info;
 355
 356         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 357                 rc = -EBUSY;
 358                 goto out;
 359         }
 360
 361         if (len == sizeof(*crypto_info)) {
 362                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 363                         rc = -EFAULT;
 364                 goto out;
 365         }
 366
 367         switch (crypto_info->cipher_type) {
 368         case TLS_CIPHER_AES_GCM_128: {
 369                 struct tls12_crypto_info_aes_gcm_128 *
 370                   crypto_info_aes_gcm_128 =
 371                   container_of(crypto_info,
 372                                struct tls12_crypto_info_aes_gcm_128,
 373                                info);
 374
 375                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 376                         rc = -EINVAL;
 377                         goto out;
 378                 }
 379                 lock_sock(sk);
 380                 memcpy(crypto_info_aes_gcm_128->iv,
 381                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 382                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 383                 memcpy(crypto_info_aes_gcm_128->rec_seq, ctx->tx.rec_seq,
 384                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 385                 release_sock(sk);
 386                 if (copy_to_user(optval,
 387                                  crypto_info_aes_gcm_128,
 388                                  sizeof(*crypto_info_aes_gcm_128)))
 389                         rc = -EFAULT;
 390                 break;
 391         }
 392         case TLS_CIPHER_AES_GCM_256: {
 393                 struct tls12_crypto_info_aes_gcm_256 *
 394                   crypto_info_aes_gcm_256 =
 395                   container_of(crypto_info,
 396                                struct tls12_crypto_info_aes_gcm_256,
 397                                info);
 398
 399                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 400                         rc = -EINVAL;
 401                         goto out;
 402                 }
 403                 lock_sock(sk);
 404                 memcpy(crypto_info_aes_gcm_256->iv,
 405                        ctx->tx.iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 406                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 407                 memcpy(crypto_info_aes_gcm_256->rec_seq, ctx->tx.rec_seq,
 408                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 409                 release_sock(sk);
 410                 if (copy_to_user(optval,
 411                                  crypto_info_aes_gcm_256,
 412                                  sizeof(*crypto_info_aes_gcm_256)))
 413                         rc = -EFAULT;
 414                 break;
 415         }
 416         default:
 417                 rc = -EINVAL;
 418         }
 419
 420 out:
 421         return rc;
 422 }
 423
 424 static int do_tls_getsockopt(struct sock *sk, int optname,
 425                              char __user *optval, int __user *optlen)
 426 {
 427         int rc = 0;
 428
 429         switch (optname) {
 430         case TLS_TX:
 431                 rc = do_tls_getsockopt_tx(sk, optval, optlen);
 432                 break;
 433         default:
 434                 rc = -ENOPROTOOPT;
 435                 break;
 436         }
 437         return rc;
 438 }
 439
 440 static int tls_getsockopt(struct sock *sk, int level, int optname,
 441                           char __user *optval, int __user *optlen)
 442 {
 443         struct tls_context *ctx = tls_get_ctx(sk);
 444
 445         if (level != SOL_TLS)
 446                 return ctx->sk_proto->getsockopt(sk, level,
 447                                                  optname, optval, optlen);
 448
 449         return do_tls_getsockopt(sk, optname, optval, optlen);
 450 }
 451
 452 static int do_tls_setsockopt_conf(struct sock *sk, char __user *optval,
 453                                   unsigned int optlen, int tx)
 454 {
 455         struct tls_crypto_info *crypto_info;
 456         struct tls_crypto_info *alt_crypto_info;
 457         struct tls_context *ctx = tls_get_ctx(sk);
 458         size_t optsize;
 459         int rc = 0;
 460         int conf;
 461
 462         if (!optval || (optlen < sizeof(*crypto_info))) {
 463                 rc = -EINVAL;
 464                 goto out;
 465         }
 466
 467         if (tx) {
 468                 crypto_info = &ctx->crypto_send.info;
 469                 alt_crypto_info = &ctx->crypto_recv.info;
 470         } else {
 471                 crypto_info = &ctx->crypto_recv.info;
 472                 alt_crypto_info = &ctx->crypto_send.info;
 473         }
 474
 475         /* Currently we don't support set crypto info more than one time */
 476         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 477                 rc = -EBUSY;
 478                 goto out;
 479         }
 480
 481         rc = copy_from_user(crypto_info, optval, sizeof(*crypto_info));
 482         if (rc) {
 483                 rc = -EFAULT;
 484                 goto err_crypto_info;
 485         }
 486
 487         /* check version */
 488         if (crypto_info->version != TLS_1_2_VERSION &&
 489             crypto_info->version != TLS_1_3_VERSION) {
 490                 rc = -EINVAL;
 491                 goto err_crypto_info;
 492         }
 493
 494         /* Ensure that TLS version and ciphers are same in both directions */
 495         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 496                 if (alt_crypto_info->version != crypto_info->version ||
 497                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 498                         rc = -EINVAL;
 499                         goto err_crypto_info;
 500                 }
 501         }
 502
 503         switch (crypto_info->cipher_type) {
 504         case TLS_CIPHER_AES_GCM_128:
 505                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 506                 break;
 507         case TLS_CIPHER_AES_GCM_256: {
 508                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 509                 break;
 510         }
 511         case TLS_CIPHER_AES_CCM_128:
 512                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 513                 break;
 514         default:
 515                 rc = -EINVAL;
 516                 goto err_crypto_info;
 517         }
 518
 519         if (optlen != optsize) {
 520                 rc = -EINVAL;
 521                 goto err_crypto_info;
 522         }
 523
 524         rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
 525                             optlen - sizeof(*crypto_info));
 526         if (rc) {
 527                 rc = -EFAULT;
 528                 goto err_crypto_info;
 529         }
 530
 531         if (tx) {
 532                 rc = tls_set_device_offload(sk, ctx);
 533                 conf = TLS_HW;
 534                 if (!rc) {
 535                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
 536                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 537                 } else {
 538                         rc = tls_set_sw_offload(sk, ctx, 1);
 539                         if (rc)
 540                                 goto err_crypto_info;
 541                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
 542                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 543                         conf = TLS_SW;
 544                 }
 545         } else {
 546                 rc = tls_set_device_offload_rx(sk, ctx);
 547                 conf = TLS_HW;
 548                 if (!rc) {
 549                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
 550                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 551                 } else {
 552                         rc = tls_set_sw_offload(sk, ctx, 0);
 553                         if (rc)
 554                                 goto err_crypto_info;
 555                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
 556                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 557                         conf = TLS_SW;
 558                 }
 559                 tls_sw_strparser_arm(sk, ctx);
 560         }
 561
 562         if (tx)
 563                 ctx->tx_conf = conf;
 564         else
 565                 ctx->rx_conf = conf;
 566         update_sk_prot(sk, ctx);
 567         if (tx) {
 568                 ctx->sk_write_space = sk->sk_write_space;
 569                 sk->sk_write_space = tls_write_space;
 570         } else {
 571                 sk->sk_socket->ops = &tls_sw_proto_ops;
 572         }
 573         goto out;
 574
 575 err_crypto_info:
 576         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 577 out:
 578         return rc;
 579 }
 580
 581 static int do_tls_setsockopt(struct sock *sk, int optname,
 582                              char __user *optval, unsigned int optlen)
 583 {
 584         int rc = 0;
 585
 586         switch (optname) {
 587         case TLS_TX:
 588         case TLS_RX:
 589                 lock_sock(sk);
 590                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 591                                             optname == TLS_TX);
 592                 release_sock(sk);
 593                 break;
 594         default:
 595                 rc = -ENOPROTOOPT;
 596                 break;
 597         }
 598         return rc;
 599 }
 600
 601 static int tls_setsockopt(struct sock *sk, int level, int optname,
 602                           char __user *optval, unsigned int optlen)
 603 {
 604         struct tls_context *ctx = tls_get_ctx(sk);
 605
 606         if (level != SOL_TLS)
 607                 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
 608                                                  optlen);
 609
 610         return do_tls_setsockopt(sk, optname, optval, optlen);
 611 }
 612
 613 struct tls_context *tls_ctx_create(struct sock *sk)
 614 {
 615         struct inet_connection_sock *icsk = inet_csk(sk);
 616         struct tls_context *ctx;
 617
 618         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 619         if (!ctx)
 620                 return NULL;
 621
 622         mutex_init(&ctx->tx_lock);
 623         rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 624         ctx->sk_proto = sk->sk_prot;
 625         return ctx;
 626 }
 627
 628 static void tls_build_proto(struct sock *sk)
 629 {
 630         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 631
 632         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 633         if (ip_ver == TLSV6 &&
 634             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv6_prot))) {
 635                 mutex_lock(&tcpv6_prot_mutex);
 636                 if (likely(sk->sk_prot != saved_tcpv6_prot)) {
 637                         build_protos(tls_prots[TLSV6], sk->sk_prot);
 638                         smp_store_release(&saved_tcpv6_prot, sk->sk_prot);
 639                 }
 640                 mutex_unlock(&tcpv6_prot_mutex);
 641         }
 642
 643         if (ip_ver == TLSV4 &&
 644             unlikely(sk->sk_prot != smp_load_acquire(&saved_tcpv4_prot))) {
 645                 mutex_lock(&tcpv4_prot_mutex);
 646                 if (likely(sk->sk_prot != saved_tcpv4_prot)) {
 647                         build_protos(tls_prots[TLSV4], sk->sk_prot);
 648                         smp_store_release(&saved_tcpv4_prot, sk->sk_prot);
 649                 }
 650                 mutex_unlock(&tcpv4_prot_mutex);
 651         }
 652 }
 653
 654 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 655                          struct proto *base)
 656 {
 657         prot[TLS_BASE][TLS_BASE] = *base;
 658         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 659         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 660         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 661
 662         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 663         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 664         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 665
 666         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 667         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 668         prot[TLS_BASE][TLS_SW].stream_memory_read = tls_sw_stream_read;
 669         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 670
 671         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 672         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 673         prot[TLS_SW][TLS_SW].stream_memory_read = tls_sw_stream_read;
 674         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 675
 676 #ifdef CONFIG_TLS_DEVICE
 677         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 678         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 679         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 680
 681         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 682         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 683         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 684
 685         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 686
 687         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 688
 689         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 690 #endif
 691 #ifdef CONFIG_TLS_TOE
 692         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 693         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_toe_hash;
 694         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_toe_unhash;
 695 #endif
 696 }
 697
 698 static int tls_init(struct sock *sk)
 699 {
 700         struct tls_context *ctx;
 701         int rc = 0;
 702
 703         tls_build_proto(sk);
 704
 705 #ifdef CONFIG_TLS_TOE
 706         if (tls_toe_bypass(sk))
 707                 return 0;
 708 #endif
 709
 710         /* The TLS ulp is currently supported only for TCP sockets
 711          * in ESTABLISHED state.
 712          * Supporting sockets in LISTEN state will require us
 713          * to modify the accept implementation to clone rather then
 714          * share the ulp context.
 715          */
 716         if (sk->sk_state != TCP_ESTABLISHED)
 717                 return -ENOTCONN;
 718
 719         /* allocate tls context */
 720         write_lock_bh(&sk->sk_callback_lock);
 721         ctx = tls_ctx_create(sk);
 722         if (!ctx) {
 723                 rc = -ENOMEM;
 724                 goto out;
 725         }
 726
 727         ctx->tx_conf = TLS_BASE;
 728         ctx->rx_conf = TLS_BASE;
 729         update_sk_prot(sk, ctx);
 730 out:
 731         write_unlock_bh(&sk->sk_callback_lock);
 732         return rc;
 733 }
 734
 735 static void tls_update(struct sock *sk, struct proto *p,
 736                        void (*write_space)(struct sock *sk))
 737 {
 738         struct tls_context *ctx;
 739
 740         ctx = tls_get_ctx(sk);
 741         if (likely(ctx)) {
 742                 ctx->sk_write_space = write_space;
 743                 ctx->sk_proto = p;
 744         } else {
 745                 sk->sk_prot = p;
 746                 sk->sk_write_space = write_space;
 747         }
 748 }
 749
 750 static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
 751 {
 752         u16 version, cipher_type;
 753         struct tls_context *ctx;
 754         struct nlattr *start;
 755         int err;
 756
 757         start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
 758         if (!start)
 759                 return -EMSGSIZE;
 760
 761         rcu_read_lock();
 762         ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
 763         if (!ctx) {
 764                 err = 0;
 765                 goto nla_failure;
 766         }
 767         version = ctx->prot_info.version;
 768         if (version) {
 769                 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
 770                 if (err)
 771                         goto nla_failure;
 772         }
 773         cipher_type = ctx->prot_info.cipher_type;
 774         if (cipher_type) {
 775                 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
 776                 if (err)
 777                         goto nla_failure;
 778         }
 779         err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
 780         if (err)
 781                 goto nla_failure;
 782
 783         err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
 784         if (err)
 785                 goto nla_failure;
 786
 787         rcu_read_unlock();
 788         nla_nest_end(skb, start);
 789         return 0;
 790
 791 nla_failure:
 792         rcu_read_unlock();
 793         nla_nest_cancel(skb, start);
 794         return err;
 795 }
 796
 797 static size_t tls_get_info_size(const struct sock *sk)
 798 {
 799         size_t size = 0;
 800
 801         size += nla_total_size(0) +             /* INET_ULP_INFO_TLS */
 802                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_VERSION */
 803                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_CIPHER */
 804                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_RXCONF */
 805                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_TXCONF */
 806                 0;
 807
 808         return size;
 809 }
 810
 811 static int __net_init tls_init_net(struct net *net)
 812 {
 813         int err;
 814
 815         net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
 816         if (!net->mib.tls_statistics)
 817                 return -ENOMEM;
 818
 819         err = tls_proc_init(net);
 820         if (err)
 821                 goto err_free_stats;
 822
 823         return 0;
 824 err_free_stats:
 825         free_percpu(net->mib.tls_statistics);
 826         return err;
 827 }
 828
 829 static void __net_exit tls_exit_net(struct net *net)
 830 {
 831         tls_proc_fini(net);
 832         free_percpu(net->mib.tls_statistics);
 833 }
 834
 835 static struct pernet_operations tls_proc_ops = {
 836         .init = tls_init_net,
 837         .exit = tls_exit_net,
 838 };
 839
 840 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
 841         .name                   = "tls",
 842         .owner                  = THIS_MODULE,
 843         .init                   = tls_init,
 844         .update                 = tls_update,
 845         .get_info               = tls_get_info,
 846         .get_info_size          = tls_get_info_size,
 847 };
 848
 849 static int __init tls_register(void)
 850 {
 851         int err;
 852
 853         err = register_pernet_subsys(&tls_proc_ops);
 854         if (err)
 855                 return err;
 856
 857         tls_sw_proto_ops = inet_stream_ops;
 858         tls_sw_proto_ops.splice_read = tls_sw_splice_read;
 859         tls_sw_proto_ops.sendpage_locked   = tls_sw_sendpage_locked,
 860
 861         tls_device_init();
 862         tcp_register_ulp(&tcp_tls_ulp_ops);
 863
 864         return 0;
 865 }
 866
 867 static void __exit tls_unregister(void)
 868 {
 869         tcp_unregister_ulp(&tcp_tls_ulp_ops);
 870         tls_device_cleanup();
 871         unregister_pernet_subsys(&tls_proc_ops);
 872 }
 873
 874 module_init(tls_register);
 875 module_exit(tls_unregister);