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