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 CHECK_CIPHER_DESC(cipher,ci)                            \
  62         static_assert(cipher ## _IV_SIZE <= TLS_MAX_IV_SIZE);           \
  63         static_assert(cipher ## _SALT_SIZE <= TLS_MAX_SALT_SIZE);               \
  64         static_assert(cipher ## _REC_SEQ_SIZE <= TLS_MAX_REC_SEQ_SIZE); \
  65         static_assert(cipher ## _TAG_SIZE == TLS_TAG_SIZE);             \
  66         static_assert(sizeof_field(struct ci, iv) == cipher ## _IV_SIZE);       \
  67         static_assert(sizeof_field(struct ci, key) == cipher ## _KEY_SIZE);     \
  68         static_assert(sizeof_field(struct ci, salt) == cipher ## _SALT_SIZE);   \
  69         static_assert(sizeof_field(struct ci, rec_seq) == cipher ## _REC_SEQ_SIZE);
  70
  71 #define __CIPHER_DESC(ci) \
  72         .iv_offset = offsetof(struct ci, iv), \
  73         .key_offset = offsetof(struct ci, key), \
  74         .salt_offset = offsetof(struct ci, salt), \
  75         .rec_seq_offset = offsetof(struct ci, rec_seq), \
  76         .crypto_info = sizeof(struct ci)
  77
  78 #define CIPHER_DESC(cipher,ci,algname,_offloadable) [cipher - TLS_CIPHER_MIN] = {       \
  79         .nonce = cipher ## _IV_SIZE, \
  80         .iv = cipher ## _IV_SIZE, \
  81         .key = cipher ## _KEY_SIZE, \
  82         .salt = cipher ## _SALT_SIZE, \
  83         .tag = cipher ## _TAG_SIZE, \
  84         .rec_seq = cipher ## _REC_SEQ_SIZE, \
  85         .cipher_name = algname, \
  86         .offloadable = _offloadable, \
  87         __CIPHER_DESC(ci), \
  88 }
  89
  90 #define CIPHER_DESC_NONCE0(cipher,ci,algname,_offloadable) [cipher - TLS_CIPHER_MIN] = { \
  91         .nonce = 0, \
  92         .iv = cipher ## _IV_SIZE, \
  93         .key = cipher ## _KEY_SIZE, \
  94         .salt = cipher ## _SALT_SIZE, \
  95         .tag = cipher ## _TAG_SIZE, \
  96         .rec_seq = cipher ## _REC_SEQ_SIZE, \
  97         .cipher_name = algname, \
  98         .offloadable = _offloadable, \
  99         __CIPHER_DESC(ci), \
 100 }
 101
 102 const struct tls_cipher_desc tls_cipher_desc[TLS_CIPHER_MAX + 1 - TLS_CIPHER_MIN] = {
 103         CIPHER_DESC(TLS_CIPHER_AES_GCM_128, tls12_crypto_info_aes_gcm_128, "gcm(aes)", true),
 104         CIPHER_DESC(TLS_CIPHER_AES_GCM_256, tls12_crypto_info_aes_gcm_256, "gcm(aes)", true),
 105         CIPHER_DESC(TLS_CIPHER_AES_CCM_128, tls12_crypto_info_aes_ccm_128, "ccm(aes)", false),
 106         CIPHER_DESC_NONCE0(TLS_CIPHER_CHACHA20_POLY1305, tls12_crypto_info_chacha20_poly1305, "rfc7539(chacha20,poly1305)", false),
 107         CIPHER_DESC(TLS_CIPHER_SM4_GCM, tls12_crypto_info_sm4_gcm, "gcm(sm4)", false),
 108         CIPHER_DESC(TLS_CIPHER_SM4_CCM, tls12_crypto_info_sm4_ccm, "ccm(sm4)", false),
 109         CIPHER_DESC(TLS_CIPHER_ARIA_GCM_128, tls12_crypto_info_aria_gcm_128, "gcm(aria)", false),
 110         CIPHER_DESC(TLS_CIPHER_ARIA_GCM_256, tls12_crypto_info_aria_gcm_256, "gcm(aria)", false),
 111 };
 112
 113 CHECK_CIPHER_DESC(TLS_CIPHER_AES_GCM_128, tls12_crypto_info_aes_gcm_128);
 114 CHECK_CIPHER_DESC(TLS_CIPHER_AES_GCM_256, tls12_crypto_info_aes_gcm_256);
 115 CHECK_CIPHER_DESC(TLS_CIPHER_AES_CCM_128, tls12_crypto_info_aes_ccm_128);
 116 CHECK_CIPHER_DESC(TLS_CIPHER_CHACHA20_POLY1305, tls12_crypto_info_chacha20_poly1305);
 117 CHECK_CIPHER_DESC(TLS_CIPHER_SM4_GCM, tls12_crypto_info_sm4_gcm);
 118 CHECK_CIPHER_DESC(TLS_CIPHER_SM4_CCM, tls12_crypto_info_sm4_ccm);
 119 CHECK_CIPHER_DESC(TLS_CIPHER_ARIA_GCM_128, tls12_crypto_info_aria_gcm_128);
 120 CHECK_CIPHER_DESC(TLS_CIPHER_ARIA_GCM_256, tls12_crypto_info_aria_gcm_256);
 121
 122 static const struct proto *saved_tcpv6_prot;
 123 static DEFINE_MUTEX(tcpv6_prot_mutex);
 124 static const struct proto *saved_tcpv4_prot;
 125 static DEFINE_MUTEX(tcpv4_prot_mutex);
 126 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
 127 static struct proto_ops tls_proto_ops[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
 128 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 129                          const struct proto *base);
 130
 131 void update_sk_prot(struct sock *sk, struct tls_context *ctx)
 132 {
 133         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 134
 135         WRITE_ONCE(sk->sk_prot,
 136                    &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]);
 137         WRITE_ONCE(sk->sk_socket->ops,
 138                    &tls_proto_ops[ip_ver][ctx->tx_conf][ctx->rx_conf]);
 139 }
 140
 141 int wait_on_pending_writer(struct sock *sk, long *timeo)
 142 {
 143         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 144         int ret, rc = 0;
 145
 146         add_wait_queue(sk_sleep(sk), &wait);
 147         while (1) {
 148                 if (!*timeo) {
 149                         rc = -EAGAIN;
 150                         break;
 151                 }
 152
 153                 if (signal_pending(current)) {
 154                         rc = sock_intr_errno(*timeo);
 155                         break;
 156                 }
 157
 158                 ret = sk_wait_event(sk, timeo,
 159                                     !READ_ONCE(sk->sk_write_pending), &wait);
 160                 if (ret) {
 161                         if (ret < 0)
 162                                 rc = ret;
 163                         break;
 164                 }
 165         }
 166         remove_wait_queue(sk_sleep(sk), &wait);
 167         return rc;
 168 }
 169
 170 int tls_push_sg(struct sock *sk,
 171                 struct tls_context *ctx,
 172                 struct scatterlist *sg,
 173                 u16 first_offset,
 174                 int flags)
 175 {
 176         struct bio_vec bvec;
 177         struct msghdr msg = {
 178                 .msg_flags = MSG_SPLICE_PAGES | flags,
 179         };
 180         int ret = 0;
 181         struct page *p;
 182         size_t size;
 183         int offset = first_offset;
 184
 185         size = sg->length - offset;
 186         offset += sg->offset;
 187
 188         ctx->splicing_pages = true;
 189         while (1) {
 190                 /* is sending application-limited? */
 191                 tcp_rate_check_app_limited(sk);
 192                 p = sg_page(sg);
 193 retry:
 194                 bvec_set_page(&bvec, p, size, offset);
 195                 iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size);
 196
 197                 ret = tcp_sendmsg_locked(sk, &msg, size);
 198
 199                 if (ret != size) {
 200                         if (ret > 0) {
 201                                 offset += ret;
 202                                 size -= ret;
 203                                 goto retry;
 204                         }
 205
 206                         offset -= sg->offset;
 207                         ctx->partially_sent_offset = offset;
 208                         ctx->partially_sent_record = (void *)sg;
 209                         ctx->splicing_pages = false;
 210                         return ret;
 211                 }
 212
 213                 put_page(p);
 214                 sk_mem_uncharge(sk, sg->length);
 215                 sg = sg_next(sg);
 216                 if (!sg)
 217                         break;
 218
 219                 offset = sg->offset;
 220                 size = sg->length;
 221         }
 222
 223         ctx->splicing_pages = false;
 224
 225         return 0;
 226 }
 227
 228 static int tls_handle_open_record(struct sock *sk, int flags)
 229 {
 230         struct tls_context *ctx = tls_get_ctx(sk);
 231
 232         if (tls_is_pending_open_record(ctx))
 233                 return ctx->push_pending_record(sk, flags);
 234
 235         return 0;
 236 }
 237
 238 int tls_process_cmsg(struct sock *sk, struct msghdr *msg,
 239                      unsigned char *record_type)
 240 {
 241         struct cmsghdr *cmsg;
 242         int rc = -EINVAL;
 243
 244         for_each_cmsghdr(cmsg, msg) {
 245                 if (!CMSG_OK(msg, cmsg))
 246                         return -EINVAL;
 247                 if (cmsg->cmsg_level != SOL_TLS)
 248                         continue;
 249
 250                 switch (cmsg->cmsg_type) {
 251                 case TLS_SET_RECORD_TYPE:
 252                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 253                                 return -EINVAL;
 254
 255                         if (msg->msg_flags & MSG_MORE)
 256                                 return -EINVAL;
 257
 258                         rc = tls_handle_open_record(sk, msg->msg_flags);
 259                         if (rc)
 260                                 return rc;
 261
 262                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 263                         rc = 0;
 264                         break;
 265                 default:
 266                         return -EINVAL;
 267                 }
 268         }
 269
 270         return rc;
 271 }
 272
 273 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 274                             int flags)
 275 {
 276         struct scatterlist *sg;
 277         u16 offset;
 278
 279         sg = ctx->partially_sent_record;
 280         offset = ctx->partially_sent_offset;
 281
 282         ctx->partially_sent_record = NULL;
 283         return tls_push_sg(sk, ctx, sg, offset, flags);
 284 }
 285
 286 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
 287 {
 288         struct scatterlist *sg;
 289
 290         for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
 291                 put_page(sg_page(sg));
 292                 sk_mem_uncharge(sk, sg->length);
 293         }
 294         ctx->partially_sent_record = NULL;
 295 }
 296
 297 static void tls_write_space(struct sock *sk)
 298 {
 299         struct tls_context *ctx = tls_get_ctx(sk);
 300
 301         /* If splicing_pages call lower protocol write space handler
 302          * to ensure we wake up any waiting operations there. For example
 303          * if splicing pages where to call sk_wait_event.
 304          */
 305         if (ctx->splicing_pages) {
 306                 ctx->sk_write_space(sk);
 307                 return;
 308         }
 309
 310 #ifdef CONFIG_TLS_DEVICE
 311         if (ctx->tx_conf == TLS_HW)
 312                 tls_device_write_space(sk, ctx);
 313         else
 314 #endif
 315                 tls_sw_write_space(sk, ctx);
 316
 317         ctx->sk_write_space(sk);
 318 }
 319
 320 /**
 321  * tls_ctx_free() - free TLS ULP context
 322  * @sk:  socket to with @ctx is attached
 323  * @ctx: TLS context structure
 324  *
 325  * Free TLS context. If @sk is %NULL caller guarantees that the socket
 326  * to which @ctx was attached has no outstanding references.
 327  */
 328 void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
 329 {
 330         if (!ctx)
 331                 return;
 332
 333         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 334         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 335         mutex_destroy(&ctx->tx_lock);
 336
 337         if (sk)
 338                 kfree_rcu(ctx, rcu);
 339         else
 340                 kfree(ctx);
 341 }
 342
 343 static void tls_sk_proto_cleanup(struct sock *sk,
 344                                  struct tls_context *ctx, long timeo)
 345 {
 346         if (unlikely(sk->sk_write_pending) &&
 347             !wait_on_pending_writer(sk, &timeo))
 348                 tls_handle_open_record(sk, 0);
 349
 350         /* We need these for tls_sw_fallback handling of other packets */
 351         if (ctx->tx_conf == TLS_SW) {
 352                 tls_sw_release_resources_tx(sk);
 353                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 354         } else if (ctx->tx_conf == TLS_HW) {
 355                 tls_device_free_resources_tx(sk);
 356                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 357         }
 358
 359         if (ctx->rx_conf == TLS_SW) {
 360                 tls_sw_release_resources_rx(sk);
 361                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 362         } else if (ctx->rx_conf == TLS_HW) {
 363                 tls_device_offload_cleanup_rx(sk);
 364                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 365         }
 366 }
 367
 368 static void tls_sk_proto_close(struct sock *sk, long timeout)
 369 {
 370         struct inet_connection_sock *icsk = inet_csk(sk);
 371         struct tls_context *ctx = tls_get_ctx(sk);
 372         long timeo = sock_sndtimeo(sk, 0);
 373         bool free_ctx;
 374
 375         if (ctx->tx_conf == TLS_SW)
 376                 tls_sw_cancel_work_tx(ctx);
 377
 378         lock_sock(sk);
 379         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 380
 381         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 382                 tls_sk_proto_cleanup(sk, ctx, timeo);
 383
 384         write_lock_bh(&sk->sk_callback_lock);
 385         if (free_ctx)
 386                 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 387         WRITE_ONCE(sk->sk_prot, ctx->sk_proto);
 388         if (sk->sk_write_space == tls_write_space)
 389                 sk->sk_write_space = ctx->sk_write_space;
 390         write_unlock_bh(&sk->sk_callback_lock);
 391         release_sock(sk);
 392         if (ctx->tx_conf == TLS_SW)
 393                 tls_sw_free_ctx_tx(ctx);
 394         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 395                 tls_sw_strparser_done(ctx);
 396         if (ctx->rx_conf == TLS_SW)
 397                 tls_sw_free_ctx_rx(ctx);
 398         ctx->sk_proto->close(sk, timeout);
 399
 400         if (free_ctx)
 401                 tls_ctx_free(sk, ctx);
 402 }
 403
 404 static __poll_t tls_sk_poll(struct file *file, struct socket *sock,
 405                             struct poll_table_struct *wait)
 406 {
 407         struct tls_sw_context_rx *ctx;
 408         struct tls_context *tls_ctx;
 409         struct sock *sk = sock->sk;
 410         struct sk_psock *psock;
 411         __poll_t mask = 0;
 412         u8 shutdown;
 413         int state;
 414
 415         mask = tcp_poll(file, sock, wait);
 416
 417         state = inet_sk_state_load(sk);
 418         shutdown = READ_ONCE(sk->sk_shutdown);
 419         if (unlikely(state != TCP_ESTABLISHED || shutdown & RCV_SHUTDOWN))
 420                 return mask;
 421
 422         tls_ctx = tls_get_ctx(sk);
 423         ctx = tls_sw_ctx_rx(tls_ctx);
 424         psock = sk_psock_get(sk);
 425
 426         if ((skb_queue_empty_lockless(&ctx->rx_list) &&
 427              !tls_strp_msg_ready(ctx) &&
 428              sk_psock_queue_empty(psock)) ||
 429             READ_ONCE(ctx->key_update_pending))
 430                 mask &= ~(EPOLLIN | EPOLLRDNORM);
 431
 432         if (psock)
 433                 sk_psock_put(sk, psock);
 434
 435         return mask;
 436 }
 437
 438 static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
 439                                   int __user *optlen, int tx)
 440 {
 441         int rc = 0;
 442         const struct tls_cipher_desc *cipher_desc;
 443         struct tls_context *ctx = tls_get_ctx(sk);
 444         struct tls_crypto_info *crypto_info;
 445         struct cipher_context *cctx;
 446         int len;
 447
 448         if (get_user(len, optlen))
 449                 return -EFAULT;
 450
 451         if (!optval || (len < sizeof(*crypto_info))) {
 452                 rc = -EINVAL;
 453                 goto out;
 454         }
 455
 456         if (!ctx) {
 457                 rc = -EBUSY;
 458                 goto out;
 459         }
 460
 461         /* get user crypto info */
 462         if (tx) {
 463                 crypto_info = &ctx->crypto_send.info;
 464                 cctx = &ctx->tx;
 465         } else {
 466                 crypto_info = &ctx->crypto_recv.info;
 467                 cctx = &ctx->rx;
 468         }
 469
 470         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 471                 rc = -EBUSY;
 472                 goto out;
 473         }
 474
 475         if (len == sizeof(*crypto_info)) {
 476                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 477                         rc = -EFAULT;
 478                 goto out;
 479         }
 480
 481         cipher_desc = get_cipher_desc(crypto_info->cipher_type);
 482         if (!cipher_desc || len != cipher_desc->crypto_info) {
 483                 rc = -EINVAL;
 484                 goto out;
 485         }
 486
 487         memcpy(crypto_info_iv(crypto_info, cipher_desc),
 488                cctx->iv + cipher_desc->salt, cipher_desc->iv);
 489         memcpy(crypto_info_rec_seq(crypto_info, cipher_desc),
 490                cctx->rec_seq, cipher_desc->rec_seq);
 491
 492         if (copy_to_user(optval, crypto_info, cipher_desc->crypto_info))
 493                 rc = -EFAULT;
 494
 495 out:
 496         return rc;
 497 }
 498
 499 static int do_tls_getsockopt_tx_zc(struct sock *sk, char __user *optval,
 500                                    int __user *optlen)
 501 {
 502         struct tls_context *ctx = tls_get_ctx(sk);
 503         unsigned int value;
 504         int len;
 505
 506         if (get_user(len, optlen))
 507                 return -EFAULT;
 508
 509         if (len != sizeof(value))
 510                 return -EINVAL;
 511
 512         value = ctx->zerocopy_sendfile;
 513         if (copy_to_user(optval, &value, sizeof(value)))
 514                 return -EFAULT;
 515
 516         return 0;
 517 }
 518
 519 static int do_tls_getsockopt_no_pad(struct sock *sk, char __user *optval,
 520                                     int __user *optlen)
 521 {
 522         struct tls_context *ctx = tls_get_ctx(sk);
 523         int value, len;
 524
 525         if (ctx->prot_info.version != TLS_1_3_VERSION)
 526                 return -EINVAL;
 527
 528         if (get_user(len, optlen))
 529                 return -EFAULT;
 530         if (len < sizeof(value))
 531                 return -EINVAL;
 532
 533         value = -EINVAL;
 534         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 535                 value = ctx->rx_no_pad;
 536         if (value < 0)
 537                 return value;
 538
 539         if (put_user(sizeof(value), optlen))
 540                 return -EFAULT;
 541         if (copy_to_user(optval, &value, sizeof(value)))
 542                 return -EFAULT;
 543
 544         return 0;
 545 }
 546
 547 static int do_tls_getsockopt(struct sock *sk, int optname,
 548                              char __user *optval, int __user *optlen)
 549 {
 550         int rc = 0;
 551
 552         lock_sock(sk);
 553
 554         switch (optname) {
 555         case TLS_TX:
 556         case TLS_RX:
 557                 rc = do_tls_getsockopt_conf(sk, optval, optlen,
 558                                             optname == TLS_TX);
 559                 break;
 560         case TLS_TX_ZEROCOPY_RO:
 561                 rc = do_tls_getsockopt_tx_zc(sk, optval, optlen);
 562                 break;
 563         case TLS_RX_EXPECT_NO_PAD:
 564                 rc = do_tls_getsockopt_no_pad(sk, optval, optlen);
 565                 break;
 566         default:
 567                 rc = -ENOPROTOOPT;
 568                 break;
 569         }
 570
 571         release_sock(sk);
 572
 573         return rc;
 574 }
 575
 576 static int tls_getsockopt(struct sock *sk, int level, int optname,
 577                           char __user *optval, int __user *optlen)
 578 {
 579         struct tls_context *ctx = tls_get_ctx(sk);
 580
 581         if (level != SOL_TLS)
 582                 return ctx->sk_proto->getsockopt(sk, level,
 583                                                  optname, optval, optlen);
 584
 585         return do_tls_getsockopt(sk, optname, optval, optlen);
 586 }
 587
 588 static int validate_crypto_info(const struct tls_crypto_info *crypto_info,
 589                                 const struct tls_crypto_info *alt_crypto_info)
 590 {
 591         if (crypto_info->version != TLS_1_2_VERSION &&
 592             crypto_info->version != TLS_1_3_VERSION)
 593                 return -EINVAL;
 594
 595         switch (crypto_info->cipher_type) {
 596         case TLS_CIPHER_ARIA_GCM_128:
 597         case TLS_CIPHER_ARIA_GCM_256:
 598                 if (crypto_info->version != TLS_1_2_VERSION)
 599                         return -EINVAL;
 600                 break;
 601         }
 602
 603         /* Ensure that TLS version and ciphers are same in both directions */
 604         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 605                 if (alt_crypto_info->version != crypto_info->version ||
 606                     alt_crypto_info->cipher_type != crypto_info->cipher_type)
 607                         return -EINVAL;
 608         }
 609
 610         return 0;
 611 }
 612
 613 static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
 614                                   unsigned int optlen, int tx)
 615 {
 616         struct tls_crypto_info *crypto_info, *alt_crypto_info;
 617         struct tls_crypto_info *old_crypto_info = NULL;
 618         struct tls_context *ctx = tls_get_ctx(sk);
 619         const struct tls_cipher_desc *cipher_desc;
 620         union tls_crypto_context *crypto_ctx;
 621         union tls_crypto_context tmp = {};
 622         bool update = false;
 623         int rc = 0;
 624         int conf;
 625
 626         if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info)))
 627                 return -EINVAL;
 628
 629         if (tx) {
 630                 crypto_ctx = &ctx->crypto_send;
 631                 alt_crypto_info = &ctx->crypto_recv.info;
 632         } else {
 633                 crypto_ctx = &ctx->crypto_recv;
 634                 alt_crypto_info = &ctx->crypto_send.info;
 635         }
 636
 637         crypto_info = &crypto_ctx->info;
 638
 639         if (TLS_CRYPTO_INFO_READY(crypto_info)) {
 640                 /* Currently we only support setting crypto info more
 641                  * than one time for TLS 1.3
 642                  */
 643                 if (crypto_info->version != TLS_1_3_VERSION) {
 644                         TLS_INC_STATS(sock_net(sk), tx ? LINUX_MIB_TLSTXREKEYERROR
 645                                                        : LINUX_MIB_TLSRXREKEYERROR);
 646                         return -EBUSY;
 647                 }
 648
 649                 update = true;
 650                 old_crypto_info = crypto_info;
 651                 crypto_info = &tmp.info;
 652                 crypto_ctx = &tmp;
 653         }
 654
 655         rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
 656         if (rc) {
 657                 rc = -EFAULT;
 658                 goto err_crypto_info;
 659         }
 660
 661         if (update) {
 662                 /* Ensure that TLS version and ciphers are not modified */
 663                 if (crypto_info->version != old_crypto_info->version ||
 664                     crypto_info->cipher_type != old_crypto_info->cipher_type)
 665                         rc = -EINVAL;
 666         } else {
 667                 rc = validate_crypto_info(crypto_info, alt_crypto_info);
 668         }
 669         if (rc)
 670                 goto err_crypto_info;
 671
 672         cipher_desc = get_cipher_desc(crypto_info->cipher_type);
 673         if (!cipher_desc) {
 674                 rc = -EINVAL;
 675                 goto err_crypto_info;
 676         }
 677
 678         if (optlen != cipher_desc->crypto_info) {
 679                 rc = -EINVAL;
 680                 goto err_crypto_info;
 681         }
 682
 683         rc = copy_from_sockptr_offset(crypto_info + 1, optval,
 684                                       sizeof(*crypto_info),
 685                                       optlen - sizeof(*crypto_info));
 686         if (rc) {
 687                 rc = -EFAULT;
 688                 goto err_crypto_info;
 689         }
 690
 691         if (tx) {
 692                 rc = tls_set_device_offload(sk);
 693                 conf = TLS_HW;
 694                 if (!rc) {
 695                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
 696                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 697                 } else {
 698                         rc = tls_set_sw_offload(sk, 1,
 699                                                 update ? crypto_info : NULL);
 700                         if (rc)
 701                                 goto err_crypto_info;
 702
 703                         if (update) {
 704                                 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXREKEYOK);
 705                         } else {
 706                                 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
 707                                 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 708                         }
 709                         conf = TLS_SW;
 710                 }
 711         } else {
 712                 rc = tls_set_device_offload_rx(sk, ctx);
 713                 conf = TLS_HW;
 714                 if (!rc) {
 715                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
 716                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 717                 } else {
 718                         rc = tls_set_sw_offload(sk, 0,
 719                                                 update ? crypto_info : NULL);
 720                         if (rc)
 721                                 goto err_crypto_info;
 722
 723                         if (update) {
 724                                 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXREKEYOK);
 725                         } else {
 726                                 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
 727                                 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 728                         }
 729                         conf = TLS_SW;
 730                 }
 731                 if (!update)
 732                         tls_sw_strparser_arm(sk, ctx);
 733         }
 734
 735         if (tx)
 736                 ctx->tx_conf = conf;
 737         else
 738                 ctx->rx_conf = conf;
 739         update_sk_prot(sk, ctx);
 740
 741         if (update)
 742                 return 0;
 743
 744         if (tx) {
 745                 ctx->sk_write_space = sk->sk_write_space;
 746                 sk->sk_write_space = tls_write_space;
 747         } else {
 748                 struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(ctx);
 749
 750                 tls_strp_check_rcv(&rx_ctx->strp);
 751         }
 752         return 0;
 753
 754 err_crypto_info:
 755         if (update) {
 756                 TLS_INC_STATS(sock_net(sk), tx ? LINUX_MIB_TLSTXREKEYERROR
 757                                                : LINUX_MIB_TLSRXREKEYERROR);
 758         }
 759         memzero_explicit(crypto_ctx, sizeof(*crypto_ctx));
 760         return rc;
 761 }
 762
 763 static int do_tls_setsockopt_tx_zc(struct sock *sk, sockptr_t optval,
 764                                    unsigned int optlen)
 765 {
 766         struct tls_context *ctx = tls_get_ctx(sk);
 767         unsigned int value;
 768
 769         if (sockptr_is_null(optval) || optlen != sizeof(value))
 770                 return -EINVAL;
 771
 772         if (copy_from_sockptr(&value, optval, sizeof(value)))
 773                 return -EFAULT;
 774
 775         if (value > 1)
 776                 return -EINVAL;
 777
 778         ctx->zerocopy_sendfile = value;
 779
 780         return 0;
 781 }
 782
 783 static int do_tls_setsockopt_no_pad(struct sock *sk, sockptr_t optval,
 784                                     unsigned int optlen)
 785 {
 786         struct tls_context *ctx = tls_get_ctx(sk);
 787         u32 val;
 788         int rc;
 789
 790         if (ctx->prot_info.version != TLS_1_3_VERSION ||
 791             sockptr_is_null(optval) || optlen < sizeof(val))
 792                 return -EINVAL;
 793
 794         rc = copy_from_sockptr(&val, optval, sizeof(val));
 795         if (rc)
 796                 return -EFAULT;
 797         if (val > 1)
 798                 return -EINVAL;
 799         rc = check_zeroed_sockptr(optval, sizeof(val), optlen - sizeof(val));
 800         if (rc < 1)
 801                 return rc == 0 ? -EINVAL : rc;
 802
 803         lock_sock(sk);
 804         rc = -EINVAL;
 805         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) {
 806                 ctx->rx_no_pad = val;
 807                 tls_update_rx_zc_capable(ctx);
 808                 rc = 0;
 809         }
 810         release_sock(sk);
 811
 812         return rc;
 813 }
 814
 815 static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
 816                              unsigned int optlen)
 817 {
 818         int rc = 0;
 819
 820         switch (optname) {
 821         case TLS_TX:
 822         case TLS_RX:
 823                 lock_sock(sk);
 824                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 825                                             optname == TLS_TX);
 826                 release_sock(sk);
 827                 break;
 828         case TLS_TX_ZEROCOPY_RO:
 829                 lock_sock(sk);
 830                 rc = do_tls_setsockopt_tx_zc(sk, optval, optlen);
 831                 release_sock(sk);
 832                 break;
 833         case TLS_RX_EXPECT_NO_PAD:
 834                 rc = do_tls_setsockopt_no_pad(sk, optval, optlen);
 835                 break;
 836         default:
 837                 rc = -ENOPROTOOPT;
 838                 break;
 839         }
 840         return rc;
 841 }
 842
 843 static int tls_setsockopt(struct sock *sk, int level, int optname,
 844                           sockptr_t optval, unsigned int optlen)
 845 {
 846         struct tls_context *ctx = tls_get_ctx(sk);
 847
 848         if (level != SOL_TLS)
 849                 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
 850                                                  optlen);
 851
 852         return do_tls_setsockopt(sk, optname, optval, optlen);
 853 }
 854
 855 static int tls_disconnect(struct sock *sk, int flags)
 856 {
 857         return -EOPNOTSUPP;
 858 }
 859
 860 struct tls_context *tls_ctx_create(struct sock *sk)
 861 {
 862         struct inet_connection_sock *icsk = inet_csk(sk);
 863         struct tls_context *ctx;
 864
 865         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 866         if (!ctx)
 867                 return NULL;
 868
 869         mutex_init(&ctx->tx_lock);
 870         ctx->sk_proto = READ_ONCE(sk->sk_prot);
 871         ctx->sk = sk;
 872         /* Release semantic of rcu_assign_pointer() ensures that
 873          * ctx->sk_proto is visible before changing sk->sk_prot in
 874          * update_sk_prot(), and prevents reading uninitialized value in
 875          * tls_{getsockopt, setsockopt}. Note that we do not need a
 876          * read barrier in tls_{getsockopt,setsockopt} as there is an
 877          * address dependency between sk->sk_proto->{getsockopt,setsockopt}
 878          * and ctx->sk_proto.
 879          */
 880         rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 881         return ctx;
 882 }
 883
 884 static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 885                             const struct proto_ops *base)
 886 {
 887         ops[TLS_BASE][TLS_BASE] = *base;
 888
 889         ops[TLS_SW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 890         ops[TLS_SW  ][TLS_BASE].splice_eof      = tls_sw_splice_eof;
 891
 892         ops[TLS_BASE][TLS_SW  ] = ops[TLS_BASE][TLS_BASE];
 893         ops[TLS_BASE][TLS_SW  ].splice_read     = tls_sw_splice_read;
 894         ops[TLS_BASE][TLS_SW  ].poll            = tls_sk_poll;
 895         ops[TLS_BASE][TLS_SW  ].read_sock       = tls_sw_read_sock;
 896
 897         ops[TLS_SW  ][TLS_SW  ] = ops[TLS_SW  ][TLS_BASE];
 898         ops[TLS_SW  ][TLS_SW  ].splice_read     = tls_sw_splice_read;
 899         ops[TLS_SW  ][TLS_SW  ].poll            = tls_sk_poll;
 900         ops[TLS_SW  ][TLS_SW  ].read_sock       = tls_sw_read_sock;
 901
 902 #ifdef CONFIG_TLS_DEVICE
 903         ops[TLS_HW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 904
 905         ops[TLS_HW  ][TLS_SW  ] = ops[TLS_BASE][TLS_SW  ];
 906
 907         ops[TLS_BASE][TLS_HW  ] = ops[TLS_BASE][TLS_SW  ];
 908
 909         ops[TLS_SW  ][TLS_HW  ] = ops[TLS_SW  ][TLS_SW  ];
 910
 911         ops[TLS_HW  ][TLS_HW  ] = ops[TLS_HW  ][TLS_SW  ];
 912 #endif
 913 #ifdef CONFIG_TLS_TOE
 914         ops[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 915 #endif
 916 }
 917
 918 static void tls_build_proto(struct sock *sk)
 919 {
 920         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 921         struct proto *prot = READ_ONCE(sk->sk_prot);
 922
 923         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 924         if (ip_ver == TLSV6 &&
 925             unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
 926                 mutex_lock(&tcpv6_prot_mutex);
 927                 if (likely(prot != saved_tcpv6_prot)) {
 928                         build_protos(tls_prots[TLSV6], prot);
 929                         build_proto_ops(tls_proto_ops[TLSV6],
 930                                         sk->sk_socket->ops);
 931                         smp_store_release(&saved_tcpv6_prot, prot);
 932                 }
 933                 mutex_unlock(&tcpv6_prot_mutex);
 934         }
 935
 936         if (ip_ver == TLSV4 &&
 937             unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
 938                 mutex_lock(&tcpv4_prot_mutex);
 939                 if (likely(prot != saved_tcpv4_prot)) {
 940                         build_protos(tls_prots[TLSV4], prot);
 941                         build_proto_ops(tls_proto_ops[TLSV4],
 942                                         sk->sk_socket->ops);
 943                         smp_store_release(&saved_tcpv4_prot, prot);
 944                 }
 945                 mutex_unlock(&tcpv4_prot_mutex);
 946         }
 947 }
 948
 949 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 950                          const struct proto *base)
 951 {
 952         prot[TLS_BASE][TLS_BASE] = *base;
 953         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 954         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 955         prot[TLS_BASE][TLS_BASE].disconnect     = tls_disconnect;
 956         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 957
 958         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 959         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 960         prot[TLS_SW][TLS_BASE].splice_eof       = tls_sw_splice_eof;
 961
 962         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 963         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 964         prot[TLS_BASE][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
 965         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 966
 967         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 968         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 969         prot[TLS_SW][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
 970         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 971
 972 #ifdef CONFIG_TLS_DEVICE
 973         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 974         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 975         prot[TLS_HW][TLS_BASE].splice_eof       = tls_device_splice_eof;
 976
 977         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 978         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 979         prot[TLS_HW][TLS_SW].splice_eof         = tls_device_splice_eof;
 980
 981         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 982
 983         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 984
 985         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 986 #endif
 987 #ifdef CONFIG_TLS_TOE
 988         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 989         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_toe_hash;
 990         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_toe_unhash;
 991 #endif
 992 }
 993
 994 static int tls_init(struct sock *sk)
 995 {
 996         struct tls_context *ctx;
 997         int rc = 0;
 998
 999         tls_build_proto(sk);
1000
1001 #ifdef CONFIG_TLS_TOE
1002         if (tls_toe_bypass(sk))
1003                 return 0;
1004 #endif
1005
1006         /* The TLS ulp is currently supported only for TCP sockets
1007          * in ESTABLISHED state.
1008          * Supporting sockets in LISTEN state will require us
1009          * to modify the accept implementation to clone rather then
1010          * share the ulp context.
1011          */
1012         if (sk->sk_state != TCP_ESTABLISHED)
1013                 return -ENOTCONN;
1014
1015         /* allocate tls context */
1016         write_lock_bh(&sk->sk_callback_lock);
1017         ctx = tls_ctx_create(sk);
1018         if (!ctx) {
1019                 rc = -ENOMEM;
1020                 goto out;
1021         }
1022
1023         ctx->tx_conf = TLS_BASE;
1024         ctx->rx_conf = TLS_BASE;
1025         update_sk_prot(sk, ctx);
1026 out:
1027         write_unlock_bh(&sk->sk_callback_lock);
1028         return rc;
1029 }
1030
1031 static void tls_update(struct sock *sk, struct proto *p,
1032                        void (*write_space)(struct sock *sk))
1033 {
1034         struct tls_context *ctx;
1035
1036         WARN_ON_ONCE(sk->sk_prot == p);
1037
1038         ctx = tls_get_ctx(sk);
1039         if (likely(ctx)) {
1040                 ctx->sk_write_space = write_space;
1041                 ctx->sk_proto = p;
1042         } else {
1043                 /* Pairs with lockless read in sk_clone_lock(). */
1044                 WRITE_ONCE(sk->sk_prot, p);
1045                 sk->sk_write_space = write_space;
1046         }
1047 }
1048
1049 static u16 tls_user_config(struct tls_context *ctx, bool tx)
1050 {
1051         u16 config = tx ? ctx->tx_conf : ctx->rx_conf;
1052
1053         switch (config) {
1054         case TLS_BASE:
1055                 return TLS_CONF_BASE;
1056         case TLS_SW:
1057                 return TLS_CONF_SW;
1058         case TLS_HW:
1059                 return TLS_CONF_HW;
1060         case TLS_HW_RECORD:
1061                 return TLS_CONF_HW_RECORD;
1062         }
1063         return 0;
1064 }
1065
1066 static int tls_get_info(struct sock *sk, struct sk_buff *skb, bool net_admin)
1067 {
1068         u16 version, cipher_type;
1069         struct tls_context *ctx;
1070         struct nlattr *start;
1071         int err;
1072
1073         start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
1074         if (!start)
1075                 return -EMSGSIZE;
1076
1077         rcu_read_lock();
1078         ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
1079         if (!ctx) {
1080                 err = 0;
1081                 goto nla_failure;
1082         }
1083         version = ctx->prot_info.version;
1084         if (version) {
1085                 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
1086                 if (err)
1087                         goto nla_failure;
1088         }
1089         cipher_type = ctx->prot_info.cipher_type;
1090         if (cipher_type) {
1091                 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
1092                 if (err)
1093                         goto nla_failure;
1094         }
1095         err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
1096         if (err)
1097                 goto nla_failure;
1098
1099         err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
1100         if (err)
1101                 goto nla_failure;
1102
1103         if (ctx->tx_conf == TLS_HW && ctx->zerocopy_sendfile) {
1104                 err = nla_put_flag(skb, TLS_INFO_ZC_RO_TX);
1105                 if (err)
1106                         goto nla_failure;
1107         }
1108         if (ctx->rx_no_pad) {
1109                 err = nla_put_flag(skb, TLS_INFO_RX_NO_PAD);
1110                 if (err)
1111                         goto nla_failure;
1112         }
1113
1114         rcu_read_unlock();
1115         nla_nest_end(skb, start);
1116         return 0;
1117
1118 nla_failure:
1119         rcu_read_unlock();
1120         nla_nest_cancel(skb, start);
1121         return err;
1122 }
1123
1124 static size_t tls_get_info_size(const struct sock *sk, bool net_admin)
1125 {
1126         size_t size = 0;
1127
1128         size += nla_total_size(0) +             /* INET_ULP_INFO_TLS */
1129                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_VERSION */
1130                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_CIPHER */
1131                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_RXCONF */
1132                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_TXCONF */
1133                 nla_total_size(0) +             /* TLS_INFO_ZC_RO_TX */
1134                 nla_total_size(0) +             /* TLS_INFO_RX_NO_PAD */
1135                 0;
1136
1137         return size;
1138 }
1139
1140 static int __net_init tls_init_net(struct net *net)
1141 {
1142         int err;
1143
1144         net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
1145         if (!net->mib.tls_statistics)
1146                 return -ENOMEM;
1147
1148         err = tls_proc_init(net);
1149         if (err)
1150                 goto err_free_stats;
1151
1152         return 0;
1153 err_free_stats:
1154         free_percpu(net->mib.tls_statistics);
1155         return err;
1156 }
1157
1158 static void __net_exit tls_exit_net(struct net *net)
1159 {
1160         tls_proc_fini(net);
1161         free_percpu(net->mib.tls_statistics);
1162 }
1163
1164 static struct pernet_operations tls_proc_ops = {
1165         .init = tls_init_net,
1166         .exit = tls_exit_net,
1167 };
1168
1169 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
1170         .name                   = "tls",
1171         .owner                  = THIS_MODULE,
1172         .init                   = tls_init,
1173         .update                 = tls_update,
1174         .get_info               = tls_get_info,
1175         .get_info_size          = tls_get_info_size,
1176 };
1177
1178 static int __init tls_register(void)
1179 {
1180         int err;
1181
1182         err = register_pernet_subsys(&tls_proc_ops);
1183         if (err)
1184                 return err;
1185
1186         err = tls_strp_dev_init();
1187         if (err)
1188                 goto err_pernet;
1189
1190         err = tls_device_init();
1191         if (err)
1192                 goto err_strp;
1193
1194         tcp_register_ulp(&tcp_tls_ulp_ops);
1195
1196         return 0;
1197 err_strp:
1198         tls_strp_dev_exit();
1199 err_pernet:
1200         unregister_pernet_subsys(&tls_proc_ops);
1201         return err;
1202 }
1203
1204 static void __exit tls_unregister(void)
1205 {
1206         tcp_unregister_ulp(&tcp_tls_ulp_ops);
1207         tls_strp_dev_exit();
1208         tls_device_cleanup();
1209         unregister_pernet_subsys(&tls_proc_ops);
1210 }
1211
1212 module_init(tls_register);
1213 module_exit(tls_unregister);