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                 lock_sock(sk);
 409                 memcpy(crypto_info_aes_gcm_128->iv,
 410                        cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 411                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 412                 memcpy(crypto_info_aes_gcm_128->rec_seq, cctx->rec_seq,
 413                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 414                 release_sock(sk);
 415                 if (copy_to_user(optval,
 416                                  crypto_info_aes_gcm_128,
 417                                  sizeof(*crypto_info_aes_gcm_128)))
 418                         rc = -EFAULT;
 419                 break;
 420         }
 421         case TLS_CIPHER_AES_GCM_256: {
 422                 struct tls12_crypto_info_aes_gcm_256 *
 423                   crypto_info_aes_gcm_256 =
 424                   container_of(crypto_info,
 425                                struct tls12_crypto_info_aes_gcm_256,
 426                                info);
 427
 428                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 429                         rc = -EINVAL;
 430                         goto out;
 431                 }
 432                 lock_sock(sk);
 433                 memcpy(crypto_info_aes_gcm_256->iv,
 434                        cctx->iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 435                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 436                 memcpy(crypto_info_aes_gcm_256->rec_seq, cctx->rec_seq,
 437                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 438                 release_sock(sk);
 439                 if (copy_to_user(optval,
 440                                  crypto_info_aes_gcm_256,
 441                                  sizeof(*crypto_info_aes_gcm_256)))
 442                         rc = -EFAULT;
 443                 break;
 444         }
 445         case TLS_CIPHER_AES_CCM_128: {
 446                 struct tls12_crypto_info_aes_ccm_128 *aes_ccm_128 =
 447                         container_of(crypto_info,
 448                                 struct tls12_crypto_info_aes_ccm_128, info);
 449
 450                 if (len != sizeof(*aes_ccm_128)) {
 451                         rc = -EINVAL;
 452                         goto out;
 453                 }
 454                 lock_sock(sk);
 455                 memcpy(aes_ccm_128->iv,
 456                        cctx->iv + TLS_CIPHER_AES_CCM_128_SALT_SIZE,
 457                        TLS_CIPHER_AES_CCM_128_IV_SIZE);
 458                 memcpy(aes_ccm_128->rec_seq, cctx->rec_seq,
 459                        TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE);
 460                 release_sock(sk);
 461                 if (copy_to_user(optval, aes_ccm_128, sizeof(*aes_ccm_128)))
 462                         rc = -EFAULT;
 463                 break;
 464         }
 465         case TLS_CIPHER_CHACHA20_POLY1305: {
 466                 struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305 =
 467                         container_of(crypto_info,
 468                                 struct tls12_crypto_info_chacha20_poly1305,
 469                                 info);
 470
 471                 if (len != sizeof(*chacha20_poly1305)) {
 472                         rc = -EINVAL;
 473                         goto out;
 474                 }
 475                 lock_sock(sk);
 476                 memcpy(chacha20_poly1305->iv,
 477                        cctx->iv + TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE,
 478                        TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);
 479                 memcpy(chacha20_poly1305->rec_seq, cctx->rec_seq,
 480                        TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE);
 481                 release_sock(sk);
 482                 if (copy_to_user(optval, chacha20_poly1305,
 483                                 sizeof(*chacha20_poly1305)))
 484                         rc = -EFAULT;
 485                 break;
 486         }
 487         case TLS_CIPHER_SM4_GCM: {
 488                 struct tls12_crypto_info_sm4_gcm *sm4_gcm_info =
 489                         container_of(crypto_info,
 490                                 struct tls12_crypto_info_sm4_gcm, info);
 491
 492                 if (len != sizeof(*sm4_gcm_info)) {
 493                         rc = -EINVAL;
 494                         goto out;
 495                 }
 496                 lock_sock(sk);
 497                 memcpy(sm4_gcm_info->iv,
 498                        cctx->iv + TLS_CIPHER_SM4_GCM_SALT_SIZE,
 499                        TLS_CIPHER_SM4_GCM_IV_SIZE);
 500                 memcpy(sm4_gcm_info->rec_seq, cctx->rec_seq,
 501                        TLS_CIPHER_SM4_GCM_REC_SEQ_SIZE);
 502                 release_sock(sk);
 503                 if (copy_to_user(optval, sm4_gcm_info, sizeof(*sm4_gcm_info)))
 504                         rc = -EFAULT;
 505                 break;
 506         }
 507         case TLS_CIPHER_SM4_CCM: {
 508                 struct tls12_crypto_info_sm4_ccm *sm4_ccm_info =
 509                         container_of(crypto_info,
 510                                 struct tls12_crypto_info_sm4_ccm, info);
 511
 512                 if (len != sizeof(*sm4_ccm_info)) {
 513                         rc = -EINVAL;
 514                         goto out;
 515                 }
 516                 lock_sock(sk);
 517                 memcpy(sm4_ccm_info->iv,
 518                        cctx->iv + TLS_CIPHER_SM4_CCM_SALT_SIZE,
 519                        TLS_CIPHER_SM4_CCM_IV_SIZE);
 520                 memcpy(sm4_ccm_info->rec_seq, cctx->rec_seq,
 521                        TLS_CIPHER_SM4_CCM_REC_SEQ_SIZE);
 522                 release_sock(sk);
 523                 if (copy_to_user(optval, sm4_ccm_info, sizeof(*sm4_ccm_info)))
 524                         rc = -EFAULT;
 525                 break;
 526         }
 527         case TLS_CIPHER_ARIA_GCM_128: {
 528                 struct tls12_crypto_info_aria_gcm_128 *
 529                   crypto_info_aria_gcm_128 =
 530                   container_of(crypto_info,
 531                                struct tls12_crypto_info_aria_gcm_128,
 532                                info);
 533
 534                 if (len != sizeof(*crypto_info_aria_gcm_128)) {
 535                         rc = -EINVAL;
 536                         goto out;
 537                 }
 538                 lock_sock(sk);
 539                 memcpy(crypto_info_aria_gcm_128->iv,
 540                        cctx->iv + TLS_CIPHER_ARIA_GCM_128_SALT_SIZE,
 541                        TLS_CIPHER_ARIA_GCM_128_IV_SIZE);
 542                 memcpy(crypto_info_aria_gcm_128->rec_seq, cctx->rec_seq,
 543                        TLS_CIPHER_ARIA_GCM_128_REC_SEQ_SIZE);
 544                 release_sock(sk);
 545                 if (copy_to_user(optval,
 546                                  crypto_info_aria_gcm_128,
 547                                  sizeof(*crypto_info_aria_gcm_128)))
 548                         rc = -EFAULT;
 549                 break;
 550         }
 551         case TLS_CIPHER_ARIA_GCM_256: {
 552                 struct tls12_crypto_info_aria_gcm_256 *
 553                   crypto_info_aria_gcm_256 =
 554                   container_of(crypto_info,
 555                                struct tls12_crypto_info_aria_gcm_256,
 556                                info);
 557
 558                 if (len != sizeof(*crypto_info_aria_gcm_256)) {
 559                         rc = -EINVAL;
 560                         goto out;
 561                 }
 562                 lock_sock(sk);
 563                 memcpy(crypto_info_aria_gcm_256->iv,
 564                        cctx->iv + TLS_CIPHER_ARIA_GCM_256_SALT_SIZE,
 565                        TLS_CIPHER_ARIA_GCM_256_IV_SIZE);
 566                 memcpy(crypto_info_aria_gcm_256->rec_seq, cctx->rec_seq,
 567                        TLS_CIPHER_ARIA_GCM_256_REC_SEQ_SIZE);
 568                 release_sock(sk);
 569                 if (copy_to_user(optval,
 570                                  crypto_info_aria_gcm_256,
 571                                  sizeof(*crypto_info_aria_gcm_256)))
 572                         rc = -EFAULT;
 573                 break;
 574         }
 575         default:
 576                 rc = -EINVAL;
 577         }
 578
 579 out:
 580         return rc;
 581 }
 582
 583 static int do_tls_getsockopt_tx_zc(struct sock *sk, char __user *optval,
 584                                    int __user *optlen)
 585 {
 586         struct tls_context *ctx = tls_get_ctx(sk);
 587         unsigned int value;
 588         int len;
 589
 590         if (get_user(len, optlen))
 591                 return -EFAULT;
 592
 593         if (len != sizeof(value))
 594                 return -EINVAL;
 595
 596         value = ctx->zerocopy_sendfile;
 597         if (copy_to_user(optval, &value, sizeof(value)))
 598                 return -EFAULT;
 599
 600         return 0;
 601 }
 602
 603 static int do_tls_getsockopt_no_pad(struct sock *sk, char __user *optval,
 604                                     int __user *optlen)
 605 {
 606         struct tls_context *ctx = tls_get_ctx(sk);
 607         int value, len;
 608
 609         if (ctx->prot_info.version != TLS_1_3_VERSION)
 610                 return -EINVAL;
 611
 612         if (get_user(len, optlen))
 613                 return -EFAULT;
 614         if (len < sizeof(value))
 615                 return -EINVAL;
 616
 617         lock_sock(sk);
 618         value = -EINVAL;
 619         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 620                 value = ctx->rx_no_pad;
 621         release_sock(sk);
 622         if (value < 0)
 623                 return value;
 624
 625         if (put_user(sizeof(value), optlen))
 626                 return -EFAULT;
 627         if (copy_to_user(optval, &value, sizeof(value)))
 628                 return -EFAULT;
 629
 630         return 0;
 631 }
 632
 633 static int do_tls_getsockopt(struct sock *sk, int optname,
 634                              char __user *optval, int __user *optlen)
 635 {
 636         int rc = 0;
 637
 638         switch (optname) {
 639         case TLS_TX:
 640         case TLS_RX:
 641                 rc = do_tls_getsockopt_conf(sk, optval, optlen,
 642                                             optname == TLS_TX);
 643                 break;
 644         case TLS_TX_ZEROCOPY_RO:
 645                 rc = do_tls_getsockopt_tx_zc(sk, optval, optlen);
 646                 break;
 647         case TLS_RX_EXPECT_NO_PAD:
 648                 rc = do_tls_getsockopt_no_pad(sk, optval, optlen);
 649                 break;
 650         default:
 651                 rc = -ENOPROTOOPT;
 652                 break;
 653         }
 654         return rc;
 655 }
 656
 657 static int tls_getsockopt(struct sock *sk, int level, int optname,
 658                           char __user *optval, int __user *optlen)
 659 {
 660         struct tls_context *ctx = tls_get_ctx(sk);
 661
 662         if (level != SOL_TLS)
 663                 return ctx->sk_proto->getsockopt(sk, level,
 664                                                  optname, optval, optlen);
 665
 666         return do_tls_getsockopt(sk, optname, optval, optlen);
 667 }
 668
 669 static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
 670                                   unsigned int optlen, int tx)
 671 {
 672         struct tls_crypto_info *crypto_info;
 673         struct tls_crypto_info *alt_crypto_info;
 674         struct tls_context *ctx = tls_get_ctx(sk);
 675         size_t optsize;
 676         int rc = 0;
 677         int conf;
 678
 679         if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info)))
 680                 return -EINVAL;
 681
 682         if (tx) {
 683                 crypto_info = &ctx->crypto_send.info;
 684                 alt_crypto_info = &ctx->crypto_recv.info;
 685         } else {
 686                 crypto_info = &ctx->crypto_recv.info;
 687                 alt_crypto_info = &ctx->crypto_send.info;
 688         }
 689
 690         /* Currently we don't support set crypto info more than one time */
 691         if (TLS_CRYPTO_INFO_READY(crypto_info))
 692                 return -EBUSY;
 693
 694         rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
 695         if (rc) {
 696                 rc = -EFAULT;
 697                 goto err_crypto_info;
 698         }
 699
 700         /* check version */
 701         if (crypto_info->version != TLS_1_2_VERSION &&
 702             crypto_info->version != TLS_1_3_VERSION) {
 703                 rc = -EINVAL;
 704                 goto err_crypto_info;
 705         }
 706
 707         /* Ensure that TLS version and ciphers are same in both directions */
 708         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 709                 if (alt_crypto_info->version != crypto_info->version ||
 710                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 711                         rc = -EINVAL;
 712                         goto err_crypto_info;
 713                 }
 714         }
 715
 716         switch (crypto_info->cipher_type) {
 717         case TLS_CIPHER_AES_GCM_128:
 718                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 719                 break;
 720         case TLS_CIPHER_AES_GCM_256: {
 721                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 722                 break;
 723         }
 724         case TLS_CIPHER_AES_CCM_128:
 725                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 726                 break;
 727         case TLS_CIPHER_CHACHA20_POLY1305:
 728                 optsize = sizeof(struct tls12_crypto_info_chacha20_poly1305);
 729                 break;
 730         case TLS_CIPHER_SM4_GCM:
 731                 optsize = sizeof(struct tls12_crypto_info_sm4_gcm);
 732                 break;
 733         case TLS_CIPHER_SM4_CCM:
 734                 optsize = sizeof(struct tls12_crypto_info_sm4_ccm);
 735                 break;
 736         case TLS_CIPHER_ARIA_GCM_128:
 737                 if (crypto_info->version != TLS_1_2_VERSION) {
 738                         rc = -EINVAL;
 739                         goto err_crypto_info;
 740                 }
 741                 optsize = sizeof(struct tls12_crypto_info_aria_gcm_128);
 742                 break;
 743         case TLS_CIPHER_ARIA_GCM_256:
 744                 if (crypto_info->version != TLS_1_2_VERSION) {
 745                         rc = -EINVAL;
 746                         goto err_crypto_info;
 747                 }
 748                 optsize = sizeof(struct tls12_crypto_info_aria_gcm_256);
 749                 break;
 750         default:
 751                 rc = -EINVAL;
 752                 goto err_crypto_info;
 753         }
 754
 755         if (optlen != optsize) {
 756                 rc = -EINVAL;
 757                 goto err_crypto_info;
 758         }
 759
 760         rc = copy_from_sockptr_offset(crypto_info + 1, optval,
 761                                       sizeof(*crypto_info),
 762                                       optlen - sizeof(*crypto_info));
 763         if (rc) {
 764                 rc = -EFAULT;
 765                 goto err_crypto_info;
 766         }
 767
 768         if (tx) {
 769                 rc = tls_set_device_offload(sk, ctx);
 770                 conf = TLS_HW;
 771                 if (!rc) {
 772                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
 773                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 774                 } else {
 775                         rc = tls_set_sw_offload(sk, ctx, 1);
 776                         if (rc)
 777                                 goto err_crypto_info;
 778                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
 779                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 780                         conf = TLS_SW;
 781                 }
 782         } else {
 783                 rc = tls_set_device_offload_rx(sk, ctx);
 784                 conf = TLS_HW;
 785                 if (!rc) {
 786                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
 787                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 788                 } else {
 789                         rc = tls_set_sw_offload(sk, ctx, 0);
 790                         if (rc)
 791                                 goto err_crypto_info;
 792                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
 793                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 794                         conf = TLS_SW;
 795                 }
 796                 tls_sw_strparser_arm(sk, ctx);
 797         }
 798
 799         if (tx)
 800                 ctx->tx_conf = conf;
 801         else
 802                 ctx->rx_conf = conf;
 803         update_sk_prot(sk, ctx);
 804         if (tx) {
 805                 ctx->sk_write_space = sk->sk_write_space;
 806                 sk->sk_write_space = tls_write_space;
 807         } else {
 808                 struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(ctx);
 809
 810                 tls_strp_check_rcv(&rx_ctx->strp);
 811         }
 812         return 0;
 813
 814 err_crypto_info:
 815         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 816         return rc;
 817 }
 818
 819 static int do_tls_setsockopt_tx_zc(struct sock *sk, sockptr_t optval,
 820                                    unsigned int optlen)
 821 {
 822         struct tls_context *ctx = tls_get_ctx(sk);
 823         unsigned int value;
 824
 825         if (sockptr_is_null(optval) || optlen != sizeof(value))
 826                 return -EINVAL;
 827
 828         if (copy_from_sockptr(&value, optval, sizeof(value)))
 829                 return -EFAULT;
 830
 831         if (value > 1)
 832                 return -EINVAL;
 833
 834         ctx->zerocopy_sendfile = value;
 835
 836         return 0;
 837 }
 838
 839 static int do_tls_setsockopt_no_pad(struct sock *sk, sockptr_t optval,
 840                                     unsigned int optlen)
 841 {
 842         struct tls_context *ctx = tls_get_ctx(sk);
 843         u32 val;
 844         int rc;
 845
 846         if (ctx->prot_info.version != TLS_1_3_VERSION ||
 847             sockptr_is_null(optval) || optlen < sizeof(val))
 848                 return -EINVAL;
 849
 850         rc = copy_from_sockptr(&val, optval, sizeof(val));
 851         if (rc)
 852                 return -EFAULT;
 853         if (val > 1)
 854                 return -EINVAL;
 855         rc = check_zeroed_sockptr(optval, sizeof(val), optlen - sizeof(val));
 856         if (rc < 1)
 857                 return rc == 0 ? -EINVAL : rc;
 858
 859         lock_sock(sk);
 860         rc = -EINVAL;
 861         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) {
 862                 ctx->rx_no_pad = val;
 863                 tls_update_rx_zc_capable(ctx);
 864                 rc = 0;
 865         }
 866         release_sock(sk);
 867
 868         return rc;
 869 }
 870
 871 static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
 872                              unsigned int optlen)
 873 {
 874         int rc = 0;
 875
 876         switch (optname) {
 877         case TLS_TX:
 878         case TLS_RX:
 879                 lock_sock(sk);
 880                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 881                                             optname == TLS_TX);
 882                 release_sock(sk);
 883                 break;
 884         case TLS_TX_ZEROCOPY_RO:
 885                 lock_sock(sk);
 886                 rc = do_tls_setsockopt_tx_zc(sk, optval, optlen);
 887                 release_sock(sk);
 888                 break;
 889         case TLS_RX_EXPECT_NO_PAD:
 890                 rc = do_tls_setsockopt_no_pad(sk, optval, optlen);
 891                 break;
 892         default:
 893                 rc = -ENOPROTOOPT;
 894                 break;
 895         }
 896         return rc;
 897 }
 898
 899 static int tls_setsockopt(struct sock *sk, int level, int optname,
 900                           sockptr_t optval, unsigned int optlen)
 901 {
 902         struct tls_context *ctx = tls_get_ctx(sk);
 903
 904         if (level != SOL_TLS)
 905                 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
 906                                                  optlen);
 907
 908         return do_tls_setsockopt(sk, optname, optval, optlen);
 909 }
 910
 911 struct tls_context *tls_ctx_create(struct sock *sk)
 912 {
 913         struct inet_connection_sock *icsk = inet_csk(sk);
 914         struct tls_context *ctx;
 915
 916         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 917         if (!ctx)
 918                 return NULL;
 919
 920         mutex_init(&ctx->tx_lock);
 921         rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 922         ctx->sk_proto = READ_ONCE(sk->sk_prot);
 923         ctx->sk = sk;
 924         return ctx;
 925 }
 926
 927 static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 928                             const struct proto_ops *base)
 929 {
 930         ops[TLS_BASE][TLS_BASE] = *base;
 931
 932         ops[TLS_SW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 933         ops[TLS_SW  ][TLS_BASE].sendpage_locked = tls_sw_sendpage_locked;
 934
 935         ops[TLS_BASE][TLS_SW  ] = ops[TLS_BASE][TLS_BASE];
 936         ops[TLS_BASE][TLS_SW  ].splice_read     = tls_sw_splice_read;
 937
 938         ops[TLS_SW  ][TLS_SW  ] = ops[TLS_SW  ][TLS_BASE];
 939         ops[TLS_SW  ][TLS_SW  ].splice_read     = tls_sw_splice_read;
 940
 941 #ifdef CONFIG_TLS_DEVICE
 942         ops[TLS_HW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 943         ops[TLS_HW  ][TLS_BASE].sendpage_locked = NULL;
 944
 945         ops[TLS_HW  ][TLS_SW  ] = ops[TLS_BASE][TLS_SW  ];
 946         ops[TLS_HW  ][TLS_SW  ].sendpage_locked = NULL;
 947
 948         ops[TLS_BASE][TLS_HW  ] = ops[TLS_BASE][TLS_SW  ];
 949
 950         ops[TLS_SW  ][TLS_HW  ] = ops[TLS_SW  ][TLS_SW  ];
 951
 952         ops[TLS_HW  ][TLS_HW  ] = ops[TLS_HW  ][TLS_SW  ];
 953         ops[TLS_HW  ][TLS_HW  ].sendpage_locked = NULL;
 954 #endif
 955 #ifdef CONFIG_TLS_TOE
 956         ops[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 957 #endif
 958 }
 959
 960 static void tls_build_proto(struct sock *sk)
 961 {
 962         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 963         struct proto *prot = READ_ONCE(sk->sk_prot);
 964
 965         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 966         if (ip_ver == TLSV6 &&
 967             unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
 968                 mutex_lock(&tcpv6_prot_mutex);
 969                 if (likely(prot != saved_tcpv6_prot)) {
 970                         build_protos(tls_prots[TLSV6], prot);
 971                         build_proto_ops(tls_proto_ops[TLSV6],
 972                                         sk->sk_socket->ops);
 973                         smp_store_release(&saved_tcpv6_prot, prot);
 974                 }
 975                 mutex_unlock(&tcpv6_prot_mutex);
 976         }
 977
 978         if (ip_ver == TLSV4 &&
 979             unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
 980                 mutex_lock(&tcpv4_prot_mutex);
 981                 if (likely(prot != saved_tcpv4_prot)) {
 982                         build_protos(tls_prots[TLSV4], prot);
 983                         build_proto_ops(tls_proto_ops[TLSV4],
 984                                         sk->sk_socket->ops);
 985                         smp_store_release(&saved_tcpv4_prot, prot);
 986                 }
 987                 mutex_unlock(&tcpv4_prot_mutex);
 988         }
 989 }
 990
 991 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 992                          const struct proto *base)
 993 {
 994         prot[TLS_BASE][TLS_BASE] = *base;
 995         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 996         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 997         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 998
 999         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
1000         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
1001         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
1002
1003         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
1004         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
1005         prot[TLS_BASE][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
1006         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
1007
1008         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
1009         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
1010         prot[TLS_SW][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
1011         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
1012
1013 #ifdef CONFIG_TLS_DEVICE
1014         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
1015         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
1016         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
1017
1018         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
1019         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
1020         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
1021
1022         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
1023
1024         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
1025
1026         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
1027 #endif
1028 #ifdef CONFIG_TLS_TOE
1029         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
1030         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_toe_hash;
1031         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_toe_unhash;
1032 #endif
1033 }
1034
1035 static int tls_init(struct sock *sk)
1036 {
1037         struct tls_context *ctx;
1038         int rc = 0;
1039
1040         tls_build_proto(sk);
1041
1042 #ifdef CONFIG_TLS_TOE
1043         if (tls_toe_bypass(sk))
1044                 return 0;
1045 #endif
1046
1047         /* The TLS ulp is currently supported only for TCP sockets
1048          * in ESTABLISHED state.
1049          * Supporting sockets in LISTEN state will require us
1050          * to modify the accept implementation to clone rather then
1051          * share the ulp context.
1052          */
1053         if (sk->sk_state != TCP_ESTABLISHED)
1054                 return -ENOTCONN;
1055
1056         /* allocate tls context */
1057         write_lock_bh(&sk->sk_callback_lock);
1058         ctx = tls_ctx_create(sk);
1059         if (!ctx) {
1060                 rc = -ENOMEM;
1061                 goto out;
1062         }
1063
1064         ctx->tx_conf = TLS_BASE;
1065         ctx->rx_conf = TLS_BASE;
1066         update_sk_prot(sk, ctx);
1067 out:
1068         write_unlock_bh(&sk->sk_callback_lock);
1069         return rc;
1070 }
1071
1072 static void tls_update(struct sock *sk, struct proto *p,
1073                        void (*write_space)(struct sock *sk))
1074 {
1075         struct tls_context *ctx;
1076
1077         WARN_ON_ONCE(sk->sk_prot == p);
1078
1079         ctx = tls_get_ctx(sk);
1080         if (likely(ctx)) {
1081                 ctx->sk_write_space = write_space;
1082                 ctx->sk_proto = p;
1083         } else {
1084                 /* Pairs with lockless read in sk_clone_lock(). */
1085                 WRITE_ONCE(sk->sk_prot, p);
1086                 sk->sk_write_space = write_space;
1087         }
1088 }
1089
1090 static u16 tls_user_config(struct tls_context *ctx, bool tx)
1091 {
1092         u16 config = tx ? ctx->tx_conf : ctx->rx_conf;
1093
1094         switch (config) {
1095         case TLS_BASE:
1096                 return TLS_CONF_BASE;
1097         case TLS_SW:
1098                 return TLS_CONF_SW;
1099         case TLS_HW:
1100                 return TLS_CONF_HW;
1101         case TLS_HW_RECORD:
1102                 return TLS_CONF_HW_RECORD;
1103         }
1104         return 0;
1105 }
1106
1107 static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
1108 {
1109         u16 version, cipher_type;
1110         struct tls_context *ctx;
1111         struct nlattr *start;
1112         int err;
1113
1114         start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
1115         if (!start)
1116                 return -EMSGSIZE;
1117
1118         rcu_read_lock();
1119         ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
1120         if (!ctx) {
1121                 err = 0;
1122                 goto nla_failure;
1123         }
1124         version = ctx->prot_info.version;
1125         if (version) {
1126                 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
1127                 if (err)
1128                         goto nla_failure;
1129         }
1130         cipher_type = ctx->prot_info.cipher_type;
1131         if (cipher_type) {
1132                 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
1133                 if (err)
1134                         goto nla_failure;
1135         }
1136         err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
1137         if (err)
1138                 goto nla_failure;
1139
1140         err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
1141         if (err)
1142                 goto nla_failure;
1143
1144         if (ctx->tx_conf == TLS_HW && ctx->zerocopy_sendfile) {
1145                 err = nla_put_flag(skb, TLS_INFO_ZC_RO_TX);
1146                 if (err)
1147                         goto nla_failure;
1148         }
1149         if (ctx->rx_no_pad) {
1150                 err = nla_put_flag(skb, TLS_INFO_RX_NO_PAD);
1151                 if (err)
1152                         goto nla_failure;
1153         }
1154
1155         rcu_read_unlock();
1156         nla_nest_end(skb, start);
1157         return 0;
1158
1159 nla_failure:
1160         rcu_read_unlock();
1161         nla_nest_cancel(skb, start);
1162         return err;
1163 }
1164
1165 static size_t tls_get_info_size(const struct sock *sk)
1166 {
1167         size_t size = 0;
1168
1169         size += nla_total_size(0) +             /* INET_ULP_INFO_TLS */
1170                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_VERSION */
1171                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_CIPHER */
1172                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_RXCONF */
1173                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_TXCONF */
1174                 nla_total_size(0) +             /* TLS_INFO_ZC_RO_TX */
1175                 nla_total_size(0) +             /* TLS_INFO_RX_NO_PAD */
1176                 0;
1177
1178         return size;
1179 }
1180
1181 static int __net_init tls_init_net(struct net *net)
1182 {
1183         int err;
1184
1185         net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
1186         if (!net->mib.tls_statistics)
1187                 return -ENOMEM;
1188
1189         err = tls_proc_init(net);
1190         if (err)
1191                 goto err_free_stats;
1192
1193         return 0;
1194 err_free_stats:
1195         free_percpu(net->mib.tls_statistics);
1196         return err;
1197 }
1198
1199 static void __net_exit tls_exit_net(struct net *net)
1200 {
1201         tls_proc_fini(net);
1202         free_percpu(net->mib.tls_statistics);
1203 }
1204
1205 static struct pernet_operations tls_proc_ops = {
1206         .init = tls_init_net,
1207         .exit = tls_exit_net,
1208 };
1209
1210 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
1211         .name                   = "tls",
1212         .owner                  = THIS_MODULE,
1213         .init                   = tls_init,
1214         .update                 = tls_update,
1215         .get_info               = tls_get_info,
1216         .get_info_size          = tls_get_info_size,
1217 };
1218
1219 static int __init tls_register(void)
1220 {
1221         int err;
1222
1223         err = register_pernet_subsys(&tls_proc_ops);
1224         if (err)
1225                 return err;
1226
1227         err = tls_strp_dev_init();
1228         if (err)
1229                 goto err_pernet;
1230
1231         err = tls_device_init();
1232         if (err)
1233                 goto err_strp;
1234
1235         tcp_register_ulp(&tcp_tls_ulp_ops);
1236
1237         return 0;
1238 err_strp:
1239         tls_strp_dev_exit();
1240 err_pernet:
1241         unregister_pernet_subsys(&tls_proc_ops);
1242         return err;
1243 }
1244
1245 static void __exit tls_unregister(void)
1246 {
1247         tcp_unregister_ulp(&tcp_tls_ulp_ops);
1248         tls_strp_dev_exit();
1249         tls_device_cleanup();
1250         unregister_pernet_subsys(&tls_proc_ops);
1251 }
1252
1253 module_init(tls_register);
1254 module_exit(tls_unregister);