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 #include "tls.h"
  49
  50 MODULE_AUTHOR("Mellanox Technologies");
  51 MODULE_DESCRIPTION("Transport Layer Security Support");
  52 MODULE_LICENSE("Dual BSD/GPL");
  53 MODULE_ALIAS_TCP_ULP("tls");
  54
  55 enum {
  56         TLSV4,
  57         TLSV6,
  58         TLS_NUM_PROTS,
  59 };
  60
  61 #define CIPHER_SIZE_DESC(cipher) [cipher] = { \
  62         .iv = cipher ## _IV_SIZE, \
  63         .key = cipher ## _KEY_SIZE, \
  64         .salt = cipher ## _SALT_SIZE, \
  65         .tag = cipher ## _TAG_SIZE, \
  66         .rec_seq = cipher ## _REC_SEQ_SIZE, \
  67 }
  68
  69 const struct tls_cipher_size_desc tls_cipher_size_desc[] = {
  70         CIPHER_SIZE_DESC(TLS_CIPHER_AES_GCM_128),
  71         CIPHER_SIZE_DESC(TLS_CIPHER_AES_GCM_256),
  72         CIPHER_SIZE_DESC(TLS_CIPHER_AES_CCM_128),
  73         CIPHER_SIZE_DESC(TLS_CIPHER_CHACHA20_POLY1305),
  74         CIPHER_SIZE_DESC(TLS_CIPHER_SM4_GCM),
  75         CIPHER_SIZE_DESC(TLS_CIPHER_SM4_CCM),
  76 };
  77
  78 static const struct proto *saved_tcpv6_prot;
  79 static DEFINE_MUTEX(tcpv6_prot_mutex);
  80 static const struct proto *saved_tcpv4_prot;
  81 static DEFINE_MUTEX(tcpv4_prot_mutex);
  82 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  83 static struct proto_ops tls_proto_ops[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  84 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
  85                          const struct proto *base);
  86
  87 void update_sk_prot(struct sock *sk, struct tls_context *ctx)
  88 {
  89         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
  90
  91         WRITE_ONCE(sk->sk_prot,
  92                    &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]);
  93         WRITE_ONCE(sk->sk_socket->ops,
  94                    &tls_proto_ops[ip_ver][ctx->tx_conf][ctx->rx_conf]);
  95 }
  96
  97 int wait_on_pending_writer(struct sock *sk, long *timeo)
  98 {
  99         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 100         int ret, rc = 0;
 101
 102         add_wait_queue(sk_sleep(sk), &wait);
 103         while (1) {
 104                 if (!*timeo) {
 105                         rc = -EAGAIN;
 106                         break;
 107                 }
 108
 109                 if (signal_pending(current)) {
 110                         rc = sock_intr_errno(*timeo);
 111                         break;
 112                 }
 113
 114                 ret = sk_wait_event(sk, timeo,
 115                                     !READ_ONCE(sk->sk_write_pending), &wait);
 116                 if (ret) {
 117                         if (ret < 0)
 118                                 rc = ret;
 119                         break;
 120                 }
 121         }
 122         remove_wait_queue(sk_sleep(sk), &wait);
 123         return rc;
 124 }
 125
 126 int tls_push_sg(struct sock *sk,
 127                 struct tls_context *ctx,
 128                 struct scatterlist *sg,
 129                 u16 first_offset,
 130                 int flags)
 131 {
 132         int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
 133         int ret = 0;
 134         struct page *p;
 135         size_t size;
 136         int offset = first_offset;
 137
 138         size = sg->length - offset;
 139         offset += sg->offset;
 140
 141         ctx->in_tcp_sendpages = true;
 142         while (1) {
 143                 if (sg_is_last(sg))
 144                         sendpage_flags = flags;
 145
 146                 /* is sending application-limited? */
 147                 tcp_rate_check_app_limited(sk);
 148                 p = sg_page(sg);
 149 retry:
 150                 ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);
 151
 152                 if (ret != size) {
 153                         if (ret > 0) {
 154                                 offset += ret;
 155                                 size -= ret;
 156                                 goto retry;
 157                         }
 158
 159                         offset -= sg->offset;
 160                         ctx->partially_sent_offset = offset;
 161                         ctx->partially_sent_record = (void *)sg;
 162                         ctx->in_tcp_sendpages = false;
 163                         return ret;
 164                 }
 165
 166                 put_page(p);
 167                 sk_mem_uncharge(sk, sg->length);
 168                 sg = sg_next(sg);
 169                 if (!sg)
 170                         break;
 171
 172                 offset = sg->offset;
 173                 size = sg->length;
 174         }
 175
 176         ctx->in_tcp_sendpages = false;
 177
 178         return 0;
 179 }
 180
 181 static int tls_handle_open_record(struct sock *sk, int flags)
 182 {
 183         struct tls_context *ctx = tls_get_ctx(sk);
 184
 185         if (tls_is_pending_open_record(ctx))
 186                 return ctx->push_pending_record(sk, flags);
 187
 188         return 0;
 189 }
 190
 191 int tls_process_cmsg(struct sock *sk, struct msghdr *msg,
 192                      unsigned char *record_type)
 193 {
 194         struct cmsghdr *cmsg;
 195         int rc = -EINVAL;
 196
 197         for_each_cmsghdr(cmsg, msg) {
 198                 if (!CMSG_OK(msg, cmsg))
 199                         return -EINVAL;
 200                 if (cmsg->cmsg_level != SOL_TLS)
 201                         continue;
 202
 203                 switch (cmsg->cmsg_type) {
 204                 case TLS_SET_RECORD_TYPE:
 205                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 206                                 return -EINVAL;
 207
 208                         if (msg->msg_flags & MSG_MORE)
 209                                 return -EINVAL;
 210
 211                         rc = tls_handle_open_record(sk, msg->msg_flags);
 212                         if (rc)
 213                                 return rc;
 214
 215                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 216                         rc = 0;
 217                         break;
 218                 default:
 219                         return -EINVAL;
 220                 }
 221         }
 222
 223         return rc;
 224 }
 225
 226 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 227                             int flags)
 228 {
 229         struct scatterlist *sg;
 230         u16 offset;
 231
 232         sg = ctx->partially_sent_record;
 233         offset = ctx->partially_sent_offset;
 234
 235         ctx->partially_sent_record = NULL;
 236         return tls_push_sg(sk, ctx, sg, offset, flags);
 237 }
 238
 239 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
 240 {
 241         struct scatterlist *sg;
 242
 243         for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
 244                 put_page(sg_page(sg));
 245                 sk_mem_uncharge(sk, sg->length);
 246         }
 247         ctx->partially_sent_record = NULL;
 248 }
 249
 250 static void tls_write_space(struct sock *sk)
 251 {
 252         struct tls_context *ctx = tls_get_ctx(sk);
 253
 254         /* If in_tcp_sendpages call lower protocol write space handler
 255          * to ensure we wake up any waiting operations there. For example
 256          * if do_tcp_sendpages where to call sk_wait_event.
 257          */
 258         if (ctx->in_tcp_sendpages) {
 259                 ctx->sk_write_space(sk);
 260                 return;
 261         }
 262
 263 #ifdef CONFIG_TLS_DEVICE
 264         if (ctx->tx_conf == TLS_HW)
 265                 tls_device_write_space(sk, ctx);
 266         else
 267 #endif
 268                 tls_sw_write_space(sk, ctx);
 269
 270         ctx->sk_write_space(sk);
 271 }
 272
 273 /**
 274  * tls_ctx_free() - free TLS ULP context
 275  * @sk:  socket to with @ctx is attached
 276  * @ctx: TLS context structure
 277  *
 278  * Free TLS context. If @sk is %NULL caller guarantees that the socket
 279  * to which @ctx was attached has no outstanding references.
 280  */
 281 void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
 282 {
 283         if (!ctx)
 284                 return;
 285
 286         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 287         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 288         mutex_destroy(&ctx->tx_lock);
 289
 290         if (sk)
 291                 kfree_rcu(ctx, rcu);
 292         else
 293                 kfree(ctx);
 294 }
 295
 296 static void tls_sk_proto_cleanup(struct sock *sk,
 297                                  struct tls_context *ctx, long timeo)
 298 {
 299         if (unlikely(sk->sk_write_pending) &&
 300             !wait_on_pending_writer(sk, &timeo))
 301                 tls_handle_open_record(sk, 0);
 302
 303         /* We need these for tls_sw_fallback handling of other packets */
 304         if (ctx->tx_conf == TLS_SW) {
 305                 kfree(ctx->tx.rec_seq);
 306                 kfree(ctx->tx.iv);
 307                 tls_sw_release_resources_tx(sk);
 308                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 309         } else if (ctx->tx_conf == TLS_HW) {
 310                 tls_device_free_resources_tx(sk);
 311                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 312         }
 313
 314         if (ctx->rx_conf == TLS_SW) {
 315                 tls_sw_release_resources_rx(sk);
 316                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 317         } else if (ctx->rx_conf == TLS_HW) {
 318                 tls_device_offload_cleanup_rx(sk);
 319                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 320         }
 321 }
 322
 323 static void tls_sk_proto_close(struct sock *sk, long timeout)
 324 {
 325         struct inet_connection_sock *icsk = inet_csk(sk);
 326         struct tls_context *ctx = tls_get_ctx(sk);
 327         long timeo = sock_sndtimeo(sk, 0);
 328         bool free_ctx;
 329
 330         if (ctx->tx_conf == TLS_SW)
 331                 tls_sw_cancel_work_tx(ctx);
 332
 333         lock_sock(sk);
 334         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 335
 336         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 337                 tls_sk_proto_cleanup(sk, ctx, timeo);
 338
 339         write_lock_bh(&sk->sk_callback_lock);
 340         if (free_ctx)
 341                 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 342         WRITE_ONCE(sk->sk_prot, ctx->sk_proto);
 343         if (sk->sk_write_space == tls_write_space)
 344                 sk->sk_write_space = ctx->sk_write_space;
 345         write_unlock_bh(&sk->sk_callback_lock);
 346         release_sock(sk);
 347         if (ctx->tx_conf == TLS_SW)
 348                 tls_sw_free_ctx_tx(ctx);
 349         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 350                 tls_sw_strparser_done(ctx);
 351         if (ctx->rx_conf == TLS_SW)
 352                 tls_sw_free_ctx_rx(ctx);
 353         ctx->sk_proto->close(sk, timeout);
 354
 355         if (free_ctx)
 356                 tls_ctx_free(sk, ctx);
 357 }
 358
 359 static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
 360                                   int __user *optlen, int tx)
 361 {
 362         int rc = 0;
 363         struct tls_context *ctx = tls_get_ctx(sk);
 364         struct tls_crypto_info *crypto_info;
 365         struct cipher_context *cctx;
 366         int len;
 367
 368         if (get_user(len, optlen))
 369                 return -EFAULT;
 370
 371         if (!optval || (len < sizeof(*crypto_info))) {
 372                 rc = -EINVAL;
 373                 goto out;
 374         }
 375
 376         if (!ctx) {
 377                 rc = -EBUSY;
 378                 goto out;
 379         }
 380
 381         /* get user crypto info */
 382         if (tx) {
 383                 crypto_info = &ctx->crypto_send.info;
 384                 cctx = &ctx->tx;
 385         } else {
 386                 crypto_info = &ctx->crypto_recv.info;
 387                 cctx = &ctx->rx;
 388         }
 389
 390         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 391                 rc = -EBUSY;
 392                 goto out;
 393         }
 394
 395         if (len == sizeof(*crypto_info)) {
 396                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 397                         rc = -EFAULT;
 398                 goto out;
 399         }
 400
 401         switch (crypto_info->cipher_type) {
 402         case TLS_CIPHER_AES_GCM_128: {
 403                 struct tls12_crypto_info_aes_gcm_128 *
 404                   crypto_info_aes_gcm_128 =
 405                   container_of(crypto_info,
 406                                struct tls12_crypto_info_aes_gcm_128,
 407                                info);
 408
 409                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 410                         rc = -EINVAL;
 411                         goto out;
 412                 }
 413                 memcpy(crypto_info_aes_gcm_128->iv,
 414                        cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 415                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 416                 memcpy(crypto_info_aes_gcm_128->rec_seq, cctx->rec_seq,
 417                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 418                 if (copy_to_user(optval,
 419                                  crypto_info_aes_gcm_128,
 420                                  sizeof(*crypto_info_aes_gcm_128)))
 421                         rc = -EFAULT;
 422                 break;
 423         }
 424         case TLS_CIPHER_AES_GCM_256: {
 425                 struct tls12_crypto_info_aes_gcm_256 *
 426                   crypto_info_aes_gcm_256 =
 427                   container_of(crypto_info,
 428                                struct tls12_crypto_info_aes_gcm_256,
 429                                info);
 430
 431                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 432                         rc = -EINVAL;
 433                         goto out;
 434                 }
 435                 memcpy(crypto_info_aes_gcm_256->iv,
 436                        cctx->iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 437                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 438                 memcpy(crypto_info_aes_gcm_256->rec_seq, cctx->rec_seq,
 439                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 440                 if (copy_to_user(optval,
 441                                  crypto_info_aes_gcm_256,
 442                                  sizeof(*crypto_info_aes_gcm_256)))
 443                         rc = -EFAULT;
 444                 break;
 445         }
 446         case TLS_CIPHER_AES_CCM_128: {
 447                 struct tls12_crypto_info_aes_ccm_128 *aes_ccm_128 =
 448                         container_of(crypto_info,
 449                                 struct tls12_crypto_info_aes_ccm_128, info);
 450
 451                 if (len != sizeof(*aes_ccm_128)) {
 452                         rc = -EINVAL;
 453                         goto out;
 454                 }
 455                 memcpy(aes_ccm_128->iv,
 456                        cctx->iv + TLS_CIPHER_AES_CCM_128_SALT_SIZE,
 457                        TLS_CIPHER_AES_CCM_128_IV_SIZE);
 458                 memcpy(aes_ccm_128->rec_seq, cctx->rec_seq,
 459                        TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE);
 460                 if (copy_to_user(optval, aes_ccm_128, sizeof(*aes_ccm_128)))
 461                         rc = -EFAULT;
 462                 break;
 463         }
 464         case TLS_CIPHER_CHACHA20_POLY1305: {
 465                 struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305 =
 466                         container_of(crypto_info,
 467                                 struct tls12_crypto_info_chacha20_poly1305,
 468                                 info);
 469
 470                 if (len != sizeof(*chacha20_poly1305)) {
 471                         rc = -EINVAL;
 472                         goto out;
 473                 }
 474                 memcpy(chacha20_poly1305->iv,
 475                        cctx->iv + TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE,
 476                        TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);
 477                 memcpy(chacha20_poly1305->rec_seq, cctx->rec_seq,
 478                        TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE);
 479                 if (copy_to_user(optval, chacha20_poly1305,
 480                                 sizeof(*chacha20_poly1305)))
 481                         rc = -EFAULT;
 482                 break;
 483         }
 484         case TLS_CIPHER_SM4_GCM: {
 485                 struct tls12_crypto_info_sm4_gcm *sm4_gcm_info =
 486                         container_of(crypto_info,
 487                                 struct tls12_crypto_info_sm4_gcm, info);
 488
 489                 if (len != sizeof(*sm4_gcm_info)) {
 490                         rc = -EINVAL;
 491                         goto out;
 492                 }
 493                 memcpy(sm4_gcm_info->iv,
 494                        cctx->iv + TLS_CIPHER_SM4_GCM_SALT_SIZE,
 495                        TLS_CIPHER_SM4_GCM_IV_SIZE);
 496                 memcpy(sm4_gcm_info->rec_seq, cctx->rec_seq,
 497                        TLS_CIPHER_SM4_GCM_REC_SEQ_SIZE);
 498                 if (copy_to_user(optval, sm4_gcm_info, sizeof(*sm4_gcm_info)))
 499                         rc = -EFAULT;
 500                 break;
 501         }
 502         case TLS_CIPHER_SM4_CCM: {
 503                 struct tls12_crypto_info_sm4_ccm *sm4_ccm_info =
 504                         container_of(crypto_info,
 505                                 struct tls12_crypto_info_sm4_ccm, info);
 506
 507                 if (len != sizeof(*sm4_ccm_info)) {
 508                         rc = -EINVAL;
 509                         goto out;
 510                 }
 511                 memcpy(sm4_ccm_info->iv,
 512                        cctx->iv + TLS_CIPHER_SM4_CCM_SALT_SIZE,
 513                        TLS_CIPHER_SM4_CCM_IV_SIZE);
 514                 memcpy(sm4_ccm_info->rec_seq, cctx->rec_seq,
 515                        TLS_CIPHER_SM4_CCM_REC_SEQ_SIZE);
 516                 if (copy_to_user(optval, sm4_ccm_info, sizeof(*sm4_ccm_info)))
 517                         rc = -EFAULT;
 518                 break;
 519         }
 520         case TLS_CIPHER_ARIA_GCM_128: {
 521                 struct tls12_crypto_info_aria_gcm_128 *
 522                   crypto_info_aria_gcm_128 =
 523                   container_of(crypto_info,
 524                                struct tls12_crypto_info_aria_gcm_128,
 525                                info);
 526
 527                 if (len != sizeof(*crypto_info_aria_gcm_128)) {
 528                         rc = -EINVAL;
 529                         goto out;
 530                 }
 531                 memcpy(crypto_info_aria_gcm_128->iv,
 532                        cctx->iv + TLS_CIPHER_ARIA_GCM_128_SALT_SIZE,
 533                        TLS_CIPHER_ARIA_GCM_128_IV_SIZE);
 534                 memcpy(crypto_info_aria_gcm_128->rec_seq, cctx->rec_seq,
 535                        TLS_CIPHER_ARIA_GCM_128_REC_SEQ_SIZE);
 536                 if (copy_to_user(optval,
 537                                  crypto_info_aria_gcm_128,
 538                                  sizeof(*crypto_info_aria_gcm_128)))
 539                         rc = -EFAULT;
 540                 break;
 541         }
 542         case TLS_CIPHER_ARIA_GCM_256: {
 543                 struct tls12_crypto_info_aria_gcm_256 *
 544                   crypto_info_aria_gcm_256 =
 545                   container_of(crypto_info,
 546                                struct tls12_crypto_info_aria_gcm_256,
 547                                info);
 548
 549                 if (len != sizeof(*crypto_info_aria_gcm_256)) {
 550                         rc = -EINVAL;
 551                         goto out;
 552                 }
 553                 memcpy(crypto_info_aria_gcm_256->iv,
 554                        cctx->iv + TLS_CIPHER_ARIA_GCM_256_SALT_SIZE,
 555                        TLS_CIPHER_ARIA_GCM_256_IV_SIZE);
 556                 memcpy(crypto_info_aria_gcm_256->rec_seq, cctx->rec_seq,
 557                        TLS_CIPHER_ARIA_GCM_256_REC_SEQ_SIZE);
 558                 if (copy_to_user(optval,
 559                                  crypto_info_aria_gcm_256,
 560                                  sizeof(*crypto_info_aria_gcm_256)))
 561                         rc = -EFAULT;
 562                 break;
 563         }
 564         default:
 565                 rc = -EINVAL;
 566         }
 567
 568 out:
 569         return rc;
 570 }
 571
 572 static int do_tls_getsockopt_tx_zc(struct sock *sk, char __user *optval,
 573                                    int __user *optlen)
 574 {
 575         struct tls_context *ctx = tls_get_ctx(sk);
 576         unsigned int value;
 577         int len;
 578
 579         if (get_user(len, optlen))
 580                 return -EFAULT;
 581
 582         if (len != sizeof(value))
 583                 return -EINVAL;
 584
 585         value = ctx->zerocopy_sendfile;
 586         if (copy_to_user(optval, &value, sizeof(value)))
 587                 return -EFAULT;
 588
 589         return 0;
 590 }
 591
 592 static int do_tls_getsockopt_no_pad(struct sock *sk, char __user *optval,
 593                                     int __user *optlen)
 594 {
 595         struct tls_context *ctx = tls_get_ctx(sk);
 596         int value, len;
 597
 598         if (ctx->prot_info.version != TLS_1_3_VERSION)
 599                 return -EINVAL;
 600
 601         if (get_user(len, optlen))
 602                 return -EFAULT;
 603         if (len < sizeof(value))
 604                 return -EINVAL;
 605
 606         value = -EINVAL;
 607         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 608                 value = ctx->rx_no_pad;
 609         if (value < 0)
 610                 return value;
 611
 612         if (put_user(sizeof(value), optlen))
 613                 return -EFAULT;
 614         if (copy_to_user(optval, &value, sizeof(value)))
 615                 return -EFAULT;
 616
 617         return 0;
 618 }
 619
 620 static int do_tls_getsockopt(struct sock *sk, int optname,
 621                              char __user *optval, int __user *optlen)
 622 {
 623         int rc = 0;
 624
 625         lock_sock(sk);
 626
 627         switch (optname) {
 628         case TLS_TX:
 629         case TLS_RX:
 630                 rc = do_tls_getsockopt_conf(sk, optval, optlen,
 631                                             optname == TLS_TX);
 632                 break;
 633         case TLS_TX_ZEROCOPY_RO:
 634                 rc = do_tls_getsockopt_tx_zc(sk, optval, optlen);
 635                 break;
 636         case TLS_RX_EXPECT_NO_PAD:
 637                 rc = do_tls_getsockopt_no_pad(sk, optval, optlen);
 638                 break;
 639         default:
 640                 rc = -ENOPROTOOPT;
 641                 break;
 642         }
 643
 644         release_sock(sk);
 645
 646         return rc;
 647 }
 648
 649 static int tls_getsockopt(struct sock *sk, int level, int optname,
 650                           char __user *optval, int __user *optlen)
 651 {
 652         struct tls_context *ctx = tls_get_ctx(sk);
 653
 654         if (level != SOL_TLS)
 655                 return ctx->sk_proto->getsockopt(sk, level,
 656                                                  optname, optval, optlen);
 657
 658         return do_tls_getsockopt(sk, optname, optval, optlen);
 659 }
 660
 661 static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
 662                                   unsigned int optlen, int tx)
 663 {
 664         struct tls_crypto_info *crypto_info;
 665         struct tls_crypto_info *alt_crypto_info;
 666         struct tls_context *ctx = tls_get_ctx(sk);
 667         size_t optsize;
 668         int rc = 0;
 669         int conf;
 670
 671         if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info)))
 672                 return -EINVAL;
 673
 674         if (tx) {
 675                 crypto_info = &ctx->crypto_send.info;
 676                 alt_crypto_info = &ctx->crypto_recv.info;
 677         } else {
 678                 crypto_info = &ctx->crypto_recv.info;
 679                 alt_crypto_info = &ctx->crypto_send.info;
 680         }
 681
 682         /* Currently we don't support set crypto info more than one time */
 683         if (TLS_CRYPTO_INFO_READY(crypto_info))
 684                 return -EBUSY;
 685
 686         rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
 687         if (rc) {
 688                 rc = -EFAULT;
 689                 goto err_crypto_info;
 690         }
 691
 692         /* check version */
 693         if (crypto_info->version != TLS_1_2_VERSION &&
 694             crypto_info->version != TLS_1_3_VERSION) {
 695                 rc = -EINVAL;
 696                 goto err_crypto_info;
 697         }
 698
 699         /* Ensure that TLS version and ciphers are same in both directions */
 700         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 701                 if (alt_crypto_info->version != crypto_info->version ||
 702                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 703                         rc = -EINVAL;
 704                         goto err_crypto_info;
 705                 }
 706         }
 707
 708         switch (crypto_info->cipher_type) {
 709         case TLS_CIPHER_AES_GCM_128:
 710                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 711                 break;
 712         case TLS_CIPHER_AES_GCM_256: {
 713                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 714                 break;
 715         }
 716         case TLS_CIPHER_AES_CCM_128:
 717                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 718                 break;
 719         case TLS_CIPHER_CHACHA20_POLY1305:
 720                 optsize = sizeof(struct tls12_crypto_info_chacha20_poly1305);
 721                 break;
 722         case TLS_CIPHER_SM4_GCM:
 723                 optsize = sizeof(struct tls12_crypto_info_sm4_gcm);
 724                 break;
 725         case TLS_CIPHER_SM4_CCM:
 726                 optsize = sizeof(struct tls12_crypto_info_sm4_ccm);
 727                 break;
 728         case TLS_CIPHER_ARIA_GCM_128:
 729                 if (crypto_info->version != TLS_1_2_VERSION) {
 730                         rc = -EINVAL;
 731                         goto err_crypto_info;
 732                 }
 733                 optsize = sizeof(struct tls12_crypto_info_aria_gcm_128);
 734                 break;
 735         case TLS_CIPHER_ARIA_GCM_256:
 736                 if (crypto_info->version != TLS_1_2_VERSION) {
 737                         rc = -EINVAL;
 738                         goto err_crypto_info;
 739                 }
 740                 optsize = sizeof(struct tls12_crypto_info_aria_gcm_256);
 741                 break;
 742         default:
 743                 rc = -EINVAL;
 744                 goto err_crypto_info;
 745         }
 746
 747         if (optlen != optsize) {
 748                 rc = -EINVAL;
 749                 goto err_crypto_info;
 750         }
 751
 752         rc = copy_from_sockptr_offset(crypto_info + 1, optval,
 753                                       sizeof(*crypto_info),
 754                                       optlen - sizeof(*crypto_info));
 755         if (rc) {
 756                 rc = -EFAULT;
 757                 goto err_crypto_info;
 758         }
 759
 760         if (tx) {
 761                 rc = tls_set_device_offload(sk, ctx);
 762                 conf = TLS_HW;
 763                 if (!rc) {
 764                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
 765                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 766                 } else {
 767                         rc = tls_set_sw_offload(sk, ctx, 1);
 768                         if (rc)
 769                                 goto err_crypto_info;
 770                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
 771                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 772                         conf = TLS_SW;
 773                 }
 774         } else {
 775                 rc = tls_set_device_offload_rx(sk, ctx);
 776                 conf = TLS_HW;
 777                 if (!rc) {
 778                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
 779                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 780                 } else {
 781                         rc = tls_set_sw_offload(sk, ctx, 0);
 782                         if (rc)
 783                                 goto err_crypto_info;
 784                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
 785                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 786                         conf = TLS_SW;
 787                 }
 788                 tls_sw_strparser_arm(sk, ctx);
 789         }
 790
 791         if (tx)
 792                 ctx->tx_conf = conf;
 793         else
 794                 ctx->rx_conf = conf;
 795         update_sk_prot(sk, ctx);
 796         if (tx) {
 797                 ctx->sk_write_space = sk->sk_write_space;
 798                 sk->sk_write_space = tls_write_space;
 799         } else {
 800                 struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(ctx);
 801
 802                 tls_strp_check_rcv(&rx_ctx->strp);
 803         }
 804         return 0;
 805
 806 err_crypto_info:
 807         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 808         return rc;
 809 }
 810
 811 static int do_tls_setsockopt_tx_zc(struct sock *sk, sockptr_t optval,
 812                                    unsigned int optlen)
 813 {
 814         struct tls_context *ctx = tls_get_ctx(sk);
 815         unsigned int value;
 816
 817         if (sockptr_is_null(optval) || optlen != sizeof(value))
 818                 return -EINVAL;
 819
 820         if (copy_from_sockptr(&value, optval, sizeof(value)))
 821                 return -EFAULT;
 822
 823         if (value > 1)
 824                 return -EINVAL;
 825
 826         ctx->zerocopy_sendfile = value;
 827
 828         return 0;
 829 }
 830
 831 static int do_tls_setsockopt_no_pad(struct sock *sk, sockptr_t optval,
 832                                     unsigned int optlen)
 833 {
 834         struct tls_context *ctx = tls_get_ctx(sk);
 835         u32 val;
 836         int rc;
 837
 838         if (ctx->prot_info.version != TLS_1_3_VERSION ||
 839             sockptr_is_null(optval) || optlen < sizeof(val))
 840                 return -EINVAL;
 841
 842         rc = copy_from_sockptr(&val, optval, sizeof(val));
 843         if (rc)
 844                 return -EFAULT;
 845         if (val > 1)
 846                 return -EINVAL;
 847         rc = check_zeroed_sockptr(optval, sizeof(val), optlen - sizeof(val));
 848         if (rc < 1)
 849                 return rc == 0 ? -EINVAL : rc;
 850
 851         lock_sock(sk);
 852         rc = -EINVAL;
 853         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) {
 854                 ctx->rx_no_pad = val;
 855                 tls_update_rx_zc_capable(ctx);
 856                 rc = 0;
 857         }
 858         release_sock(sk);
 859
 860         return rc;
 861 }
 862
 863 static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
 864                              unsigned int optlen)
 865 {
 866         int rc = 0;
 867
 868         switch (optname) {
 869         case TLS_TX:
 870         case TLS_RX:
 871                 lock_sock(sk);
 872                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 873                                             optname == TLS_TX);
 874                 release_sock(sk);
 875                 break;
 876         case TLS_TX_ZEROCOPY_RO:
 877                 lock_sock(sk);
 878                 rc = do_tls_setsockopt_tx_zc(sk, optval, optlen);
 879                 release_sock(sk);
 880                 break;
 881         case TLS_RX_EXPECT_NO_PAD:
 882                 rc = do_tls_setsockopt_no_pad(sk, optval, optlen);
 883                 break;
 884         default:
 885                 rc = -ENOPROTOOPT;
 886                 break;
 887         }
 888         return rc;
 889 }
 890
 891 static int tls_setsockopt(struct sock *sk, int level, int optname,
 892                           sockptr_t optval, unsigned int optlen)
 893 {
 894         struct tls_context *ctx = tls_get_ctx(sk);
 895
 896         if (level != SOL_TLS)
 897                 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
 898                                                  optlen);
 899
 900         return do_tls_setsockopt(sk, optname, optval, optlen);
 901 }
 902
 903 struct tls_context *tls_ctx_create(struct sock *sk)
 904 {
 905         struct inet_connection_sock *icsk = inet_csk(sk);
 906         struct tls_context *ctx;
 907
 908         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 909         if (!ctx)
 910                 return NULL;
 911
 912         mutex_init(&ctx->tx_lock);
 913         rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 914         ctx->sk_proto = READ_ONCE(sk->sk_prot);
 915         ctx->sk = sk;
 916         return ctx;
 917 }
 918
 919 static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 920                             const struct proto_ops *base)
 921 {
 922         ops[TLS_BASE][TLS_BASE] = *base;
 923
 924         ops[TLS_SW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 925         ops[TLS_SW  ][TLS_BASE].splice_eof      = tls_sw_splice_eof;
 926         ops[TLS_SW  ][TLS_BASE].sendpage_locked = tls_sw_sendpage_locked;
 927
 928         ops[TLS_BASE][TLS_SW  ] = ops[TLS_BASE][TLS_BASE];
 929         ops[TLS_BASE][TLS_SW  ].splice_read     = tls_sw_splice_read;
 930
 931         ops[TLS_SW  ][TLS_SW  ] = ops[TLS_SW  ][TLS_BASE];
 932         ops[TLS_SW  ][TLS_SW  ].splice_read     = tls_sw_splice_read;
 933
 934 #ifdef CONFIG_TLS_DEVICE
 935         ops[TLS_HW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 936         ops[TLS_HW  ][TLS_BASE].sendpage_locked = NULL;
 937
 938         ops[TLS_HW  ][TLS_SW  ] = ops[TLS_BASE][TLS_SW  ];
 939         ops[TLS_HW  ][TLS_SW  ].sendpage_locked = NULL;
 940
 941         ops[TLS_BASE][TLS_HW  ] = ops[TLS_BASE][TLS_SW  ];
 942
 943         ops[TLS_SW  ][TLS_HW  ] = ops[TLS_SW  ][TLS_SW  ];
 944
 945         ops[TLS_HW  ][TLS_HW  ] = ops[TLS_HW  ][TLS_SW  ];
 946         ops[TLS_HW  ][TLS_HW  ].sendpage_locked = NULL;
 947 #endif
 948 #ifdef CONFIG_TLS_TOE
 949         ops[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 950 #endif
 951 }
 952
 953 static void tls_build_proto(struct sock *sk)
 954 {
 955         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 956         struct proto *prot = READ_ONCE(sk->sk_prot);
 957
 958         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 959         if (ip_ver == TLSV6 &&
 960             unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
 961                 mutex_lock(&tcpv6_prot_mutex);
 962                 if (likely(prot != saved_tcpv6_prot)) {
 963                         build_protos(tls_prots[TLSV6], prot);
 964                         build_proto_ops(tls_proto_ops[TLSV6],
 965                                         sk->sk_socket->ops);
 966                         smp_store_release(&saved_tcpv6_prot, prot);
 967                 }
 968                 mutex_unlock(&tcpv6_prot_mutex);
 969         }
 970
 971         if (ip_ver == TLSV4 &&
 972             unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
 973                 mutex_lock(&tcpv4_prot_mutex);
 974                 if (likely(prot != saved_tcpv4_prot)) {
 975                         build_protos(tls_prots[TLSV4], prot);
 976                         build_proto_ops(tls_proto_ops[TLSV4],
 977                                         sk->sk_socket->ops);
 978                         smp_store_release(&saved_tcpv4_prot, prot);
 979                 }
 980                 mutex_unlock(&tcpv4_prot_mutex);
 981         }
 982 }
 983
 984 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 985                          const struct proto *base)
 986 {
 987         prot[TLS_BASE][TLS_BASE] = *base;
 988         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 989         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 990         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 991
 992         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 993         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 994         prot[TLS_SW][TLS_BASE].splice_eof       = tls_sw_splice_eof;
 995         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 996
 997         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 998         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 999         prot[TLS_BASE][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
1000         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
1001
1002         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
1003         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
1004         prot[TLS_SW][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
1005         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
1006
1007 #ifdef CONFIG_TLS_DEVICE
1008         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
1009         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
1010         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
1011
1012         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
1013         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
1014         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
1015
1016         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
1017
1018         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
1019
1020         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
1021 #endif
1022 #ifdef CONFIG_TLS_TOE
1023         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
1024         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_toe_hash;
1025         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_toe_unhash;
1026 #endif
1027 }
1028
1029 static int tls_init(struct sock *sk)
1030 {
1031         struct tls_context *ctx;
1032         int rc = 0;
1033
1034         tls_build_proto(sk);
1035
1036 #ifdef CONFIG_TLS_TOE
1037         if (tls_toe_bypass(sk))
1038                 return 0;
1039 #endif
1040
1041         /* The TLS ulp is currently supported only for TCP sockets
1042          * in ESTABLISHED state.
1043          * Supporting sockets in LISTEN state will require us
1044          * to modify the accept implementation to clone rather then
1045          * share the ulp context.
1046          */
1047         if (sk->sk_state != TCP_ESTABLISHED)
1048                 return -ENOTCONN;
1049
1050         /* allocate tls context */
1051         write_lock_bh(&sk->sk_callback_lock);
1052         ctx = tls_ctx_create(sk);
1053         if (!ctx) {
1054                 rc = -ENOMEM;
1055                 goto out;
1056         }
1057
1058         ctx->tx_conf = TLS_BASE;
1059         ctx->rx_conf = TLS_BASE;
1060         update_sk_prot(sk, ctx);
1061 out:
1062         write_unlock_bh(&sk->sk_callback_lock);
1063         return rc;
1064 }
1065
1066 static void tls_update(struct sock *sk, struct proto *p,
1067                        void (*write_space)(struct sock *sk))
1068 {
1069         struct tls_context *ctx;
1070
1071         WARN_ON_ONCE(sk->sk_prot == p);
1072
1073         ctx = tls_get_ctx(sk);
1074         if (likely(ctx)) {
1075                 ctx->sk_write_space = write_space;
1076                 ctx->sk_proto = p;
1077         } else {
1078                 /* Pairs with lockless read in sk_clone_lock(). */
1079                 WRITE_ONCE(sk->sk_prot, p);
1080                 sk->sk_write_space = write_space;
1081         }
1082 }
1083
1084 static u16 tls_user_config(struct tls_context *ctx, bool tx)
1085 {
1086         u16 config = tx ? ctx->tx_conf : ctx->rx_conf;
1087
1088         switch (config) {
1089         case TLS_BASE:
1090                 return TLS_CONF_BASE;
1091         case TLS_SW:
1092                 return TLS_CONF_SW;
1093         case TLS_HW:
1094                 return TLS_CONF_HW;
1095         case TLS_HW_RECORD:
1096                 return TLS_CONF_HW_RECORD;
1097         }
1098         return 0;
1099 }
1100
1101 static int tls_get_info(struct sock *sk, struct sk_buff *skb)
1102 {
1103         u16 version, cipher_type;
1104         struct tls_context *ctx;
1105         struct nlattr *start;
1106         int err;
1107
1108         start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
1109         if (!start)
1110                 return -EMSGSIZE;
1111
1112         rcu_read_lock();
1113         ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
1114         if (!ctx) {
1115                 err = 0;
1116                 goto nla_failure;
1117         }
1118         version = ctx->prot_info.version;
1119         if (version) {
1120                 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
1121                 if (err)
1122                         goto nla_failure;
1123         }
1124         cipher_type = ctx->prot_info.cipher_type;
1125         if (cipher_type) {
1126                 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
1127                 if (err)
1128                         goto nla_failure;
1129         }
1130         err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
1131         if (err)
1132                 goto nla_failure;
1133
1134         err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
1135         if (err)
1136                 goto nla_failure;
1137
1138         if (ctx->tx_conf == TLS_HW && ctx->zerocopy_sendfile) {
1139                 err = nla_put_flag(skb, TLS_INFO_ZC_RO_TX);
1140                 if (err)
1141                         goto nla_failure;
1142         }
1143         if (ctx->rx_no_pad) {
1144                 err = nla_put_flag(skb, TLS_INFO_RX_NO_PAD);
1145                 if (err)
1146                         goto nla_failure;
1147         }
1148
1149         rcu_read_unlock();
1150         nla_nest_end(skb, start);
1151         return 0;
1152
1153 nla_failure:
1154         rcu_read_unlock();
1155         nla_nest_cancel(skb, start);
1156         return err;
1157 }
1158
1159 static size_t tls_get_info_size(const struct sock *sk)
1160 {
1161         size_t size = 0;
1162
1163         size += nla_total_size(0) +             /* INET_ULP_INFO_TLS */
1164                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_VERSION */
1165                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_CIPHER */
1166                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_RXCONF */
1167                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_TXCONF */
1168                 nla_total_size(0) +             /* TLS_INFO_ZC_RO_TX */
1169                 nla_total_size(0) +             /* TLS_INFO_RX_NO_PAD */
1170                 0;
1171
1172         return size;
1173 }
1174
1175 static int __net_init tls_init_net(struct net *net)
1176 {
1177         int err;
1178
1179         net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
1180         if (!net->mib.tls_statistics)
1181                 return -ENOMEM;
1182
1183         err = tls_proc_init(net);
1184         if (err)
1185                 goto err_free_stats;
1186
1187         return 0;
1188 err_free_stats:
1189         free_percpu(net->mib.tls_statistics);
1190         return err;
1191 }
1192
1193 static void __net_exit tls_exit_net(struct net *net)
1194 {
1195         tls_proc_fini(net);
1196         free_percpu(net->mib.tls_statistics);
1197 }
1198
1199 static struct pernet_operations tls_proc_ops = {
1200         .init = tls_init_net,
1201         .exit = tls_exit_net,
1202 };
1203
1204 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
1205         .name                   = "tls",
1206         .owner                  = THIS_MODULE,
1207         .init                   = tls_init,
1208         .update                 = tls_update,
1209         .get_info               = tls_get_info,
1210         .get_info_size          = tls_get_info_size,
1211 };
1212
1213 static int __init tls_register(void)
1214 {
1215         int err;
1216
1217         err = register_pernet_subsys(&tls_proc_ops);
1218         if (err)
1219                 return err;
1220
1221         err = tls_strp_dev_init();
1222         if (err)
1223                 goto err_pernet;
1224
1225         err = tls_device_init();
1226         if (err)
1227                 goto err_strp;
1228
1229         tcp_register_ulp(&tcp_tls_ulp_ops);
1230
1231         return 0;
1232 err_strp:
1233         tls_strp_dev_exit();
1234 err_pernet:
1235         unregister_pernet_subsys(&tls_proc_ops);
1236         return err;
1237 }
1238
1239 static void __exit tls_unregister(void)
1240 {
1241         tcp_unregister_ulp(&tcp_tls_ulp_ops);
1242         tls_strp_dev_exit();
1243         tls_device_cleanup();
1244         unregister_pernet_subsys(&tls_proc_ops);
1245 }
1246
1247 module_init(tls_register);
1248 module_exit(tls_unregister);