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