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