net/tls/tls_main.c

   1 /*
   2  * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
   3  * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/module.h>
  35
  36 #include <net/tcp.h>
  37 #include <net/inet_common.h>
  38 #include <linux/highmem.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/sched/signal.h>
  41 #include <linux/inetdevice.h>
  42 #include <linux/inet_diag.h>
  43
  44 #include <net/snmp.h>
  45 #include <net/tls.h>
  46 #include <net/tls_toe.h>
  47
  48 #include "tls.h"
  49
  50 MODULE_AUTHOR("Mellanox Technologies");
  51 MODULE_DESCRIPTION("Transport Layer Security Support");
  52 MODULE_LICENSE("Dual BSD/GPL");
  53 MODULE_ALIAS_TCP_ULP("tls");
  54
  55 enum {
  56         TLSV4,
  57         TLSV6,
  58         TLS_NUM_PROTS,
  59 };
  60
  61 #define CIPHER_SIZE_DESC(cipher) [cipher] = { \
  62         .iv = cipher ## _IV_SIZE, \
  63         .key = cipher ## _KEY_SIZE, \
  64         .salt = cipher ## _SALT_SIZE, \
  65         .tag = cipher ## _TAG_SIZE, \
  66         .rec_seq = cipher ## _REC_SEQ_SIZE, \
  67 }
  68
  69 const struct tls_cipher_size_desc tls_cipher_size_desc[] = {
  70         CIPHER_SIZE_DESC(TLS_CIPHER_AES_GCM_128),
  71         CIPHER_SIZE_DESC(TLS_CIPHER_AES_GCM_256),
  72         CIPHER_SIZE_DESC(TLS_CIPHER_AES_CCM_128),
  73         CIPHER_SIZE_DESC(TLS_CIPHER_CHACHA20_POLY1305),
  74         CIPHER_SIZE_DESC(TLS_CIPHER_SM4_GCM),
  75         CIPHER_SIZE_DESC(TLS_CIPHER_SM4_CCM),
  76 };
  77
  78 static const struct proto *saved_tcpv6_prot;
  79 static DEFINE_MUTEX(tcpv6_prot_mutex);
  80 static const struct proto *saved_tcpv4_prot;
  81 static DEFINE_MUTEX(tcpv4_prot_mutex);
  82 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  83 static struct proto_ops tls_proto_ops[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  84 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
  85                          const struct proto *base);
  86
  87 void update_sk_prot(struct sock *sk, struct tls_context *ctx)
  88 {
  89         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
  90
  91         WRITE_ONCE(sk->sk_prot,
  92                    &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]);
  93         WRITE_ONCE(sk->sk_socket->ops,
  94                    &tls_proto_ops[ip_ver][ctx->tx_conf][ctx->rx_conf]);
  95 }
  96
  97 int wait_on_pending_writer(struct sock *sk, long *timeo)
  98 {
  99         int rc = 0;
 100         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 101
 102         add_wait_queue(sk_sleep(sk), &wait);
 103         while (1) {
 104                 if (!*timeo) {
 105                         rc = -EAGAIN;
 106                         break;
 107                 }
 108
 109                 if (signal_pending(current)) {
 110                         rc = sock_intr_errno(*timeo);
 111                         break;
 112                 }
 113
 114                 if (sk_wait_event(sk, timeo,
 115                                   !READ_ONCE(sk->sk_write_pending), &wait))
 116                         break;
 117         }
 118         remove_wait_queue(sk_sleep(sk), &wait);
 119         return rc;
 120 }
 121
 122 int tls_push_sg(struct sock *sk,
 123                 struct tls_context *ctx,
 124                 struct scatterlist *sg,
 125                 u16 first_offset,
 126                 int flags)
 127 {
 128         struct bio_vec bvec;
 129         struct msghdr msg = {
 130                 .msg_flags = MSG_SENDPAGE_NOTLAST | MSG_SPLICE_PAGES | flags,
 131         };
 132         int ret = 0;
 133         struct page *p;
 134         size_t size;
 135         int offset = first_offset;
 136
 137         size = sg->length - offset;
 138         offset += sg->offset;
 139
 140         ctx->splicing_pages = true;
 141         while (1) {
 142                 if (sg_is_last(sg))
 143                         msg.msg_flags = flags;
 144
 145                 /* is sending application-limited? */
 146                 tcp_rate_check_app_limited(sk);
 147                 p = sg_page(sg);
 148 retry:
 149                 bvec_set_page(&bvec, p, size, offset);
 150                 iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size);
 151
 152                 ret = tcp_sendmsg_locked(sk, &msg, size);
 153
 154                 if (ret != size) {
 155                         if (ret > 0) {
 156                                 offset += ret;
 157                                 size -= ret;
 158                                 goto retry;
 159                         }
 160
 161                         offset -= sg->offset;
 162                         ctx->partially_sent_offset = offset;
 163                         ctx->partially_sent_record = (void *)sg;
 164                         ctx->splicing_pages = false;
 165                         return ret;
 166                 }
 167
 168                 put_page(p);
 169                 sk_mem_uncharge(sk, sg->length);
 170                 sg = sg_next(sg);
 171                 if (!sg)
 172                         break;
 173
 174                 offset = sg->offset;
 175                 size = sg->length;
 176         }
 177
 178         ctx->splicing_pages = false;
 179
 180         return 0;
 181 }
 182
 183 static int tls_handle_open_record(struct sock *sk, int flags)
 184 {
 185         struct tls_context *ctx = tls_get_ctx(sk);
 186
 187         if (tls_is_pending_open_record(ctx))
 188                 return ctx->push_pending_record(sk, flags);
 189
 190         return 0;
 191 }
 192
 193 int tls_process_cmsg(struct sock *sk, struct msghdr *msg,
 194                      unsigned char *record_type)
 195 {
 196         struct cmsghdr *cmsg;
 197         int rc = -EINVAL;
 198
 199         for_each_cmsghdr(cmsg, msg) {
 200                 if (!CMSG_OK(msg, cmsg))
 201                         return -EINVAL;
 202                 if (cmsg->cmsg_level != SOL_TLS)
 203                         continue;
 204
 205                 switch (cmsg->cmsg_type) {
 206                 case TLS_SET_RECORD_TYPE:
 207                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 208                                 return -EINVAL;
 209
 210                         if (msg->msg_flags & MSG_MORE)
 211                                 return -EINVAL;
 212
 213                         rc = tls_handle_open_record(sk, msg->msg_flags);
 214                         if (rc)
 215                                 return rc;
 216
 217                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 218                         rc = 0;
 219                         break;
 220                 default:
 221                         return -EINVAL;
 222                 }
 223         }
 224
 225         return rc;
 226 }
 227
 228 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 229                             int flags)
 230 {
 231         struct scatterlist *sg;
 232         u16 offset;
 233
 234         sg = ctx->partially_sent_record;
 235         offset = ctx->partially_sent_offset;
 236
 237         ctx->partially_sent_record = NULL;
 238         return tls_push_sg(sk, ctx, sg, offset, flags);
 239 }
 240
 241 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
 242 {
 243         struct scatterlist *sg;
 244
 245         for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
 246                 put_page(sg_page(sg));
 247                 sk_mem_uncharge(sk, sg->length);
 248         }
 249         ctx->partially_sent_record = NULL;
 250 }
 251
 252 static void tls_write_space(struct sock *sk)
 253 {
 254         struct tls_context *ctx = tls_get_ctx(sk);
 255
 256         /* If splicing_pages call lower protocol write space handler
 257          * to ensure we wake up any waiting operations there. For example
 258          * if splicing pages where to call sk_wait_event.
 259          */
 260         if (ctx->splicing_pages) {
 261                 ctx->sk_write_space(sk);
 262                 return;
 263         }
 264
 265 #ifdef CONFIG_TLS_DEVICE
 266         if (ctx->tx_conf == TLS_HW)
 267                 tls_device_write_space(sk, ctx);
 268         else
 269 #endif
 270                 tls_sw_write_space(sk, ctx);
 271
 272         ctx->sk_write_space(sk);
 273 }
 274
 275 /**
 276  * tls_ctx_free() - free TLS ULP context
 277  * @sk:  socket to with @ctx is attached
 278  * @ctx: TLS context structure
 279  *
 280  * Free TLS context. If @sk is %NULL caller guarantees that the socket
 281  * to which @ctx was attached has no outstanding references.
 282  */
 283 void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
 284 {
 285         if (!ctx)
 286                 return;
 287
 288         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 289         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 290         mutex_destroy(&ctx->tx_lock);
 291
 292         if (sk)
 293                 kfree_rcu(ctx, rcu);
 294         else
 295                 kfree(ctx);
 296 }
 297
 298 static void tls_sk_proto_cleanup(struct sock *sk,
 299                                  struct tls_context *ctx, long timeo)
 300 {
 301         if (unlikely(sk->sk_write_pending) &&
 302             !wait_on_pending_writer(sk, &timeo))
 303                 tls_handle_open_record(sk, 0);
 304
 305         /* We need these for tls_sw_fallback handling of other packets */
 306         if (ctx->tx_conf == TLS_SW) {
 307                 kfree(ctx->tx.rec_seq);
 308                 kfree(ctx->tx.iv);
 309                 tls_sw_release_resources_tx(sk);
 310                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 311         } else if (ctx->tx_conf == TLS_HW) {
 312                 tls_device_free_resources_tx(sk);
 313                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 314         }
 315
 316         if (ctx->rx_conf == TLS_SW) {
 317                 tls_sw_release_resources_rx(sk);
 318                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 319         } else if (ctx->rx_conf == TLS_HW) {
 320                 tls_device_offload_cleanup_rx(sk);
 321                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 322         }
 323 }
 324
 325 static void tls_sk_proto_close(struct sock *sk, long timeout)
 326 {
 327         struct inet_connection_sock *icsk = inet_csk(sk);
 328         struct tls_context *ctx = tls_get_ctx(sk);
 329         long timeo = sock_sndtimeo(sk, 0);
 330         bool free_ctx;
 331
 332         if (ctx->tx_conf == TLS_SW)
 333                 tls_sw_cancel_work_tx(ctx);
 334
 335         lock_sock(sk);
 336         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 337
 338         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 339                 tls_sk_proto_cleanup(sk, ctx, timeo);
 340
 341         write_lock_bh(&sk->sk_callback_lock);
 342         if (free_ctx)
 343                 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 344         WRITE_ONCE(sk->sk_prot, ctx->sk_proto);
 345         if (sk->sk_write_space == tls_write_space)
 346                 sk->sk_write_space = ctx->sk_write_space;
 347         write_unlock_bh(&sk->sk_callback_lock);
 348         release_sock(sk);
 349         if (ctx->tx_conf == TLS_SW)
 350                 tls_sw_free_ctx_tx(ctx);
 351         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 352                 tls_sw_strparser_done(ctx);
 353         if (ctx->rx_conf == TLS_SW)
 354                 tls_sw_free_ctx_rx(ctx);
 355         ctx->sk_proto->close(sk, timeout);
 356
 357         if (free_ctx)
 358                 tls_ctx_free(sk, ctx);
 359 }
 360
 361 static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
 362                                   int __user *optlen, int tx)
 363 {
 364         int rc = 0;
 365         struct tls_context *ctx = tls_get_ctx(sk);
 366         struct tls_crypto_info *crypto_info;
 367         struct cipher_context *cctx;
 368         int len;
 369
 370         if (get_user(len, optlen))
 371                 return -EFAULT;
 372
 373         if (!optval || (len < sizeof(*crypto_info))) {
 374                 rc = -EINVAL;
 375                 goto out;
 376         }
 377
 378         if (!ctx) {
 379                 rc = -EBUSY;
 380                 goto out;
 381         }
 382
 383         /* get user crypto info */
 384         if (tx) {
 385                 crypto_info = &ctx->crypto_send.info;
 386                 cctx = &ctx->tx;
 387         } else {
 388                 crypto_info = &ctx->crypto_recv.info;
 389                 cctx = &ctx->rx;
 390         }
 391
 392         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 393                 rc = -EBUSY;
 394                 goto out;
 395         }
 396
 397         if (len == sizeof(*crypto_info)) {
 398                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 399                         rc = -EFAULT;
 400                 goto out;
 401         }
 402
 403         switch (crypto_info->cipher_type) {
 404         case TLS_CIPHER_AES_GCM_128: {
 405                 struct tls12_crypto_info_aes_gcm_128 *
 406                   crypto_info_aes_gcm_128 =
 407                   container_of(crypto_info,
 408                                struct tls12_crypto_info_aes_gcm_128,
 409                                info);
 410
 411                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 412                         rc = -EINVAL;
 413                         goto out;
 414                 }
 415                 memcpy(crypto_info_aes_gcm_128->iv,
 416                        cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 417                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 418                 memcpy(crypto_info_aes_gcm_128->rec_seq, cctx->rec_seq,
 419                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 420                 if (copy_to_user(optval,
 421                                  crypto_info_aes_gcm_128,
 422                                  sizeof(*crypto_info_aes_gcm_128)))
 423                         rc = -EFAULT;
 424                 break;
 425         }
 426         case TLS_CIPHER_AES_GCM_256: {
 427                 struct tls12_crypto_info_aes_gcm_256 *
 428                   crypto_info_aes_gcm_256 =
 429                   container_of(crypto_info,
 430                                struct tls12_crypto_info_aes_gcm_256,
 431                                info);
 432
 433                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 434                         rc = -EINVAL;
 435                         goto out;
 436                 }
 437                 memcpy(crypto_info_aes_gcm_256->iv,
 438                        cctx->iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 439                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 440                 memcpy(crypto_info_aes_gcm_256->rec_seq, cctx->rec_seq,
 441                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 442                 if (copy_to_user(optval,
 443                                  crypto_info_aes_gcm_256,
 444                                  sizeof(*crypto_info_aes_gcm_256)))
 445                         rc = -EFAULT;
 446                 break;
 447         }
 448         case TLS_CIPHER_AES_CCM_128: {
 449                 struct tls12_crypto_info_aes_ccm_128 *aes_ccm_128 =
 450                         container_of(crypto_info,
 451                                 struct tls12_crypto_info_aes_ccm_128, info);
 452
 453                 if (len != sizeof(*aes_ccm_128)) {
 454                         rc = -EINVAL;
 455                         goto out;
 456                 }
 457                 memcpy(aes_ccm_128->iv,
 458                        cctx->iv + TLS_CIPHER_AES_CCM_128_SALT_SIZE,
 459                        TLS_CIPHER_AES_CCM_128_IV_SIZE);
 460                 memcpy(aes_ccm_128->rec_seq, cctx->rec_seq,
 461                        TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE);
 462                 if (copy_to_user(optval, aes_ccm_128, sizeof(*aes_ccm_128)))
 463                         rc = -EFAULT;
 464                 break;
 465         }
 466         case TLS_CIPHER_CHACHA20_POLY1305: {
 467                 struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305 =
 468                         container_of(crypto_info,
 469                                 struct tls12_crypto_info_chacha20_poly1305,
 470                                 info);
 471
 472                 if (len != sizeof(*chacha20_poly1305)) {
 473                         rc = -EINVAL;
 474                         goto out;
 475                 }
 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                 if (copy_to_user(optval, chacha20_poly1305,
 482                                 sizeof(*chacha20_poly1305)))
 483                         rc = -EFAULT;
 484                 break;
 485         }
 486         case TLS_CIPHER_SM4_GCM: {
 487                 struct tls12_crypto_info_sm4_gcm *sm4_gcm_info =
 488                         container_of(crypto_info,
 489                                 struct tls12_crypto_info_sm4_gcm, info);
 490
 491                 if (len != sizeof(*sm4_gcm_info)) {
 492                         rc = -EINVAL;
 493                         goto out;
 494                 }
 495                 memcpy(sm4_gcm_info->iv,
 496                        cctx->iv + TLS_CIPHER_SM4_GCM_SALT_SIZE,
 497                        TLS_CIPHER_SM4_GCM_IV_SIZE);
 498                 memcpy(sm4_gcm_info->rec_seq, cctx->rec_seq,
 499                        TLS_CIPHER_SM4_GCM_REC_SEQ_SIZE);
 500                 if (copy_to_user(optval, sm4_gcm_info, sizeof(*sm4_gcm_info)))
 501                         rc = -EFAULT;
 502                 break;
 503         }
 504         case TLS_CIPHER_SM4_CCM: {
 505                 struct tls12_crypto_info_sm4_ccm *sm4_ccm_info =
 506                         container_of(crypto_info,
 507                                 struct tls12_crypto_info_sm4_ccm, info);
 508
 509                 if (len != sizeof(*sm4_ccm_info)) {
 510                         rc = -EINVAL;
 511                         goto out;
 512                 }
 513                 memcpy(sm4_ccm_info->iv,
 514                        cctx->iv + TLS_CIPHER_SM4_CCM_SALT_SIZE,
 515                        TLS_CIPHER_SM4_CCM_IV_SIZE);
 516                 memcpy(sm4_ccm_info->rec_seq, cctx->rec_seq,
 517                        TLS_CIPHER_SM4_CCM_REC_SEQ_SIZE);
 518                 if (copy_to_user(optval, sm4_ccm_info, sizeof(*sm4_ccm_info)))
 519                         rc = -EFAULT;
 520                 break;
 521         }
 522         case TLS_CIPHER_ARIA_GCM_128: {
 523                 struct tls12_crypto_info_aria_gcm_128 *
 524                   crypto_info_aria_gcm_128 =
 525                   container_of(crypto_info,
 526                                struct tls12_crypto_info_aria_gcm_128,
 527                                info);
 528
 529                 if (len != sizeof(*crypto_info_aria_gcm_128)) {
 530                         rc = -EINVAL;
 531                         goto out;
 532                 }
 533                 memcpy(crypto_info_aria_gcm_128->iv,
 534                        cctx->iv + TLS_CIPHER_ARIA_GCM_128_SALT_SIZE,
 535                        TLS_CIPHER_ARIA_GCM_128_IV_SIZE);
 536                 memcpy(crypto_info_aria_gcm_128->rec_seq, cctx->rec_seq,
 537                        TLS_CIPHER_ARIA_GCM_128_REC_SEQ_SIZE);
 538                 if (copy_to_user(optval,
 539                                  crypto_info_aria_gcm_128,
 540                                  sizeof(*crypto_info_aria_gcm_128)))
 541                         rc = -EFAULT;
 542                 break;
 543         }
 544         case TLS_CIPHER_ARIA_GCM_256: {
 545                 struct tls12_crypto_info_aria_gcm_256 *
 546                   crypto_info_aria_gcm_256 =
 547                   container_of(crypto_info,
 548                                struct tls12_crypto_info_aria_gcm_256,
 549                                info);
 550
 551                 if (len != sizeof(*crypto_info_aria_gcm_256)) {
 552                         rc = -EINVAL;
 553                         goto out;
 554                 }
 555                 memcpy(crypto_info_aria_gcm_256->iv,
 556                        cctx->iv + TLS_CIPHER_ARIA_GCM_256_SALT_SIZE,
 557                        TLS_CIPHER_ARIA_GCM_256_IV_SIZE);
 558                 memcpy(crypto_info_aria_gcm_256->rec_seq, cctx->rec_seq,
 559                        TLS_CIPHER_ARIA_GCM_256_REC_SEQ_SIZE);
 560                 if (copy_to_user(optval,
 561                                  crypto_info_aria_gcm_256,
 562                                  sizeof(*crypto_info_aria_gcm_256)))
 563                         rc = -EFAULT;
 564                 break;
 565         }
 566         default:
 567                 rc = -EINVAL;
 568         }
 569
 570 out:
 571         return rc;
 572 }
 573
 574 static int do_tls_getsockopt_tx_zc(struct sock *sk, char __user *optval,
 575                                    int __user *optlen)
 576 {
 577         struct tls_context *ctx = tls_get_ctx(sk);
 578         unsigned int value;
 579         int len;
 580
 581         if (get_user(len, optlen))
 582                 return -EFAULT;
 583
 584         if (len != sizeof(value))
 585                 return -EINVAL;
 586
 587         value = ctx->zerocopy_sendfile;
 588         if (copy_to_user(optval, &value, sizeof(value)))
 589                 return -EFAULT;
 590
 591         return 0;
 592 }
 593
 594 static int do_tls_getsockopt_no_pad(struct sock *sk, char __user *optval,
 595                                     int __user *optlen)
 596 {
 597         struct tls_context *ctx = tls_get_ctx(sk);
 598         int value, len;
 599
 600         if (ctx->prot_info.version != TLS_1_3_VERSION)
 601                 return -EINVAL;
 602
 603         if (get_user(len, optlen))
 604                 return -EFAULT;
 605         if (len < sizeof(value))
 606                 return -EINVAL;
 607
 608         value = -EINVAL;
 609         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 610                 value = ctx->rx_no_pad;
 611         if (value < 0)
 612                 return value;
 613
 614         if (put_user(sizeof(value), optlen))
 615                 return -EFAULT;
 616         if (copy_to_user(optval, &value, sizeof(value)))
 617                 return -EFAULT;
 618
 619         return 0;
 620 }
 621
 622 static int do_tls_getsockopt(struct sock *sk, int optname,
 623                              char __user *optval, int __user *optlen)
 624 {
 625         int rc = 0;
 626
 627         lock_sock(sk);
 628
 629         switch (optname) {
 630         case TLS_TX:
 631         case TLS_RX:
 632                 rc = do_tls_getsockopt_conf(sk, optval, optlen,
 633                                             optname == TLS_TX);
 634                 break;
 635         case TLS_TX_ZEROCOPY_RO:
 636                 rc = do_tls_getsockopt_tx_zc(sk, optval, optlen);
 637                 break;
 638         case TLS_RX_EXPECT_NO_PAD:
 639                 rc = do_tls_getsockopt_no_pad(sk, optval, optlen);
 640                 break;
 641         default:
 642                 rc = -ENOPROTOOPT;
 643                 break;
 644         }
 645
 646         release_sock(sk);
 647
 648         return rc;
 649 }
 650
 651 static int tls_getsockopt(struct sock *sk, int level, int optname,
 652                           char __user *optval, int __user *optlen)
 653 {
 654         struct tls_context *ctx = tls_get_ctx(sk);
 655
 656         if (level != SOL_TLS)
 657                 return ctx->sk_proto->getsockopt(sk, level,
 658                                                  optname, optval, optlen);
 659
 660         return do_tls_getsockopt(sk, optname, optval, optlen);
 661 }
 662
 663 static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
 664                                   unsigned int optlen, int tx)
 665 {
 666         struct tls_crypto_info *crypto_info;
 667         struct tls_crypto_info *alt_crypto_info;
 668         struct tls_context *ctx = tls_get_ctx(sk);
 669         size_t optsize;
 670         int rc = 0;
 671         int conf;
 672
 673         if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info)))
 674                 return -EINVAL;
 675
 676         if (tx) {
 677                 crypto_info = &ctx->crypto_send.info;
 678                 alt_crypto_info = &ctx->crypto_recv.info;
 679         } else {
 680                 crypto_info = &ctx->crypto_recv.info;
 681                 alt_crypto_info = &ctx->crypto_send.info;
 682         }
 683
 684         /* Currently we don't support set crypto info more than one time */
 685         if (TLS_CRYPTO_INFO_READY(crypto_info))
 686                 return -EBUSY;
 687
 688         rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
 689         if (rc) {
 690                 rc = -EFAULT;
 691                 goto err_crypto_info;
 692         }
 693
 694         /* check version */
 695         if (crypto_info->version != TLS_1_2_VERSION &&
 696             crypto_info->version != TLS_1_3_VERSION) {
 697                 rc = -EINVAL;
 698                 goto err_crypto_info;
 699         }
 700
 701         /* Ensure that TLS version and ciphers are same in both directions */
 702         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 703                 if (alt_crypto_info->version != crypto_info->version ||
 704                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 705                         rc = -EINVAL;
 706                         goto err_crypto_info;
 707                 }
 708         }
 709
 710         switch (crypto_info->cipher_type) {
 711         case TLS_CIPHER_AES_GCM_128:
 712                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 713                 break;
 714         case TLS_CIPHER_AES_GCM_256: {
 715                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 716                 break;
 717         }
 718         case TLS_CIPHER_AES_CCM_128:
 719                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 720                 break;
 721         case TLS_CIPHER_CHACHA20_POLY1305:
 722                 optsize = sizeof(struct tls12_crypto_info_chacha20_poly1305);
 723                 break;
 724         case TLS_CIPHER_SM4_GCM:
 725                 optsize = sizeof(struct tls12_crypto_info_sm4_gcm);
 726                 break;
 727         case TLS_CIPHER_SM4_CCM:
 728                 optsize = sizeof(struct tls12_crypto_info_sm4_ccm);
 729                 break;
 730         case TLS_CIPHER_ARIA_GCM_128:
 731                 if (crypto_info->version != TLS_1_2_VERSION) {
 732                         rc = -EINVAL;
 733                         goto err_crypto_info;
 734                 }
 735                 optsize = sizeof(struct tls12_crypto_info_aria_gcm_128);
 736                 break;
 737         case TLS_CIPHER_ARIA_GCM_256:
 738                 if (crypto_info->version != TLS_1_2_VERSION) {
 739                         rc = -EINVAL;
 740                         goto err_crypto_info;
 741                 }
 742                 optsize = sizeof(struct tls12_crypto_info_aria_gcm_256);
 743                 break;
 744         default:
 745                 rc = -EINVAL;
 746                 goto err_crypto_info;
 747         }
 748
 749         if (optlen != optsize) {
 750                 rc = -EINVAL;
 751                 goto err_crypto_info;
 752         }
 753
 754         rc = copy_from_sockptr_offset(crypto_info + 1, optval,
 755                                       sizeof(*crypto_info),
 756                                       optlen - sizeof(*crypto_info));
 757         if (rc) {
 758                 rc = -EFAULT;
 759                 goto err_crypto_info;
 760         }
 761
 762         if (tx) {
 763                 rc = tls_set_device_offload(sk, ctx);
 764                 conf = TLS_HW;
 765                 if (!rc) {
 766                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
 767                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 768                 } else {
 769                         rc = tls_set_sw_offload(sk, ctx, 1);
 770                         if (rc)
 771                                 goto err_crypto_info;
 772                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
 773                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 774                         conf = TLS_SW;
 775                 }
 776         } else {
 777                 rc = tls_set_device_offload_rx(sk, ctx);
 778                 conf = TLS_HW;
 779                 if (!rc) {
 780                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
 781                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 782                 } else {
 783                         rc = tls_set_sw_offload(sk, ctx, 0);
 784                         if (rc)
 785                                 goto err_crypto_info;
 786                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
 787                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 788                         conf = TLS_SW;
 789                 }
 790                 tls_sw_strparser_arm(sk, ctx);
 791         }
 792
 793         if (tx)
 794                 ctx->tx_conf = conf;
 795         else
 796                 ctx->rx_conf = conf;
 797         update_sk_prot(sk, ctx);
 798         if (tx) {
 799                 ctx->sk_write_space = sk->sk_write_space;
 800                 sk->sk_write_space = tls_write_space;
 801         } else {
 802                 struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(ctx);
 803
 804                 tls_strp_check_rcv(&rx_ctx->strp);
 805         }
 806         return 0;
 807
 808 err_crypto_info:
 809         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 810         return rc;
 811 }
 812
 813 static int do_tls_setsockopt_tx_zc(struct sock *sk, sockptr_t optval,
 814                                    unsigned int optlen)
 815 {
 816         struct tls_context *ctx = tls_get_ctx(sk);
 817         unsigned int value;
 818
 819         if (sockptr_is_null(optval) || optlen != sizeof(value))
 820                 return -EINVAL;
 821
 822         if (copy_from_sockptr(&value, optval, sizeof(value)))
 823                 return -EFAULT;
 824
 825         if (value > 1)
 826                 return -EINVAL;
 827
 828         ctx->zerocopy_sendfile = value;
 829
 830         return 0;
 831 }
 832
 833 static int do_tls_setsockopt_no_pad(struct sock *sk, sockptr_t optval,
 834                                     unsigned int optlen)
 835 {
 836         struct tls_context *ctx = tls_get_ctx(sk);
 837         u32 val;
 838         int rc;
 839
 840         if (ctx->prot_info.version != TLS_1_3_VERSION ||
 841             sockptr_is_null(optval) || optlen < sizeof(val))
 842                 return -EINVAL;
 843
 844         rc = copy_from_sockptr(&val, optval, sizeof(val));
 845         if (rc)
 846                 return -EFAULT;
 847         if (val > 1)
 848                 return -EINVAL;
 849         rc = check_zeroed_sockptr(optval, sizeof(val), optlen - sizeof(val));
 850         if (rc < 1)
 851                 return rc == 0 ? -EINVAL : rc;
 852
 853         lock_sock(sk);
 854         rc = -EINVAL;
 855         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) {
 856                 ctx->rx_no_pad = val;
 857                 tls_update_rx_zc_capable(ctx);
 858                 rc = 0;
 859         }
 860         release_sock(sk);
 861
 862         return rc;
 863 }
 864
 865 static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
 866                              unsigned int optlen)
 867 {
 868         int rc = 0;
 869
 870         switch (optname) {
 871         case TLS_TX:
 872         case TLS_RX:
 873                 lock_sock(sk);
 874                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 875                                             optname == TLS_TX);
 876                 release_sock(sk);
 877                 break;
 878         case TLS_TX_ZEROCOPY_RO:
 879                 lock_sock(sk);
 880                 rc = do_tls_setsockopt_tx_zc(sk, optval, optlen);
 881                 release_sock(sk);
 882                 break;
 883         case TLS_RX_EXPECT_NO_PAD:
 884                 rc = do_tls_setsockopt_no_pad(sk, optval, optlen);
 885                 break;
 886         default:
 887                 rc = -ENOPROTOOPT;
 888                 break;
 889         }
 890         return rc;
 891 }
 892
 893 static int tls_setsockopt(struct sock *sk, int level, int optname,
 894                           sockptr_t optval, unsigned int optlen)
 895 {
 896         struct tls_context *ctx = tls_get_ctx(sk);
 897
 898         if (level != SOL_TLS)
 899                 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
 900                                                  optlen);
 901
 902         return do_tls_setsockopt(sk, optname, optval, optlen);
 903 }
 904
 905 struct tls_context *tls_ctx_create(struct sock *sk)
 906 {
 907         struct inet_connection_sock *icsk = inet_csk(sk);
 908         struct tls_context *ctx;
 909
 910         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 911         if (!ctx)
 912                 return NULL;
 913
 914         mutex_init(&ctx->tx_lock);
 915         rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 916         ctx->sk_proto = READ_ONCE(sk->sk_prot);
 917         ctx->sk = sk;
 918         return ctx;
 919 }
 920
 921 static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 922                             const struct proto_ops *base)
 923 {
 924         ops[TLS_BASE][TLS_BASE] = *base;
 925
 926         ops[TLS_SW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 927         ops[TLS_SW  ][TLS_BASE].sendpage_locked = tls_sw_sendpage_locked;
 928
 929         ops[TLS_BASE][TLS_SW  ] = ops[TLS_BASE][TLS_BASE];
 930         ops[TLS_BASE][TLS_SW  ].splice_read     = tls_sw_splice_read;
 931
 932         ops[TLS_SW  ][TLS_SW  ] = ops[TLS_SW  ][TLS_BASE];
 933         ops[TLS_SW  ][TLS_SW  ].splice_read     = tls_sw_splice_read;
 934
 935 #ifdef CONFIG_TLS_DEVICE
 936         ops[TLS_HW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 937         ops[TLS_HW  ][TLS_BASE].sendpage_locked = NULL;
 938
 939         ops[TLS_HW  ][TLS_SW  ] = ops[TLS_BASE][TLS_SW  ];
 940         ops[TLS_HW  ][TLS_SW  ].sendpage_locked = NULL;
 941
 942         ops[TLS_BASE][TLS_HW  ] = ops[TLS_BASE][TLS_SW  ];
 943
 944         ops[TLS_SW  ][TLS_HW  ] = ops[TLS_SW  ][TLS_SW  ];
 945
 946         ops[TLS_HW  ][TLS_HW  ] = ops[TLS_HW  ][TLS_SW  ];
 947         ops[TLS_HW  ][TLS_HW  ].sendpage_locked = NULL;
 948 #endif
 949 #ifdef CONFIG_TLS_TOE
 950         ops[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 951 #endif
 952 }
 953
 954 static void tls_build_proto(struct sock *sk)
 955 {
 956         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 957         struct proto *prot = READ_ONCE(sk->sk_prot);
 958
 959         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 960         if (ip_ver == TLSV6 &&
 961             unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
 962                 mutex_lock(&tcpv6_prot_mutex);
 963                 if (likely(prot != saved_tcpv6_prot)) {
 964                         build_protos(tls_prots[TLSV6], prot);
 965                         build_proto_ops(tls_proto_ops[TLSV6],
 966                                         sk->sk_socket->ops);
 967                         smp_store_release(&saved_tcpv6_prot, prot);
 968                 }
 969                 mutex_unlock(&tcpv6_prot_mutex);
 970         }
 971
 972         if (ip_ver == TLSV4 &&
 973             unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
 974                 mutex_lock(&tcpv4_prot_mutex);
 975                 if (likely(prot != saved_tcpv4_prot)) {
 976                         build_protos(tls_prots[TLSV4], prot);
 977                         build_proto_ops(tls_proto_ops[TLSV4],
 978                                         sk->sk_socket->ops);
 979                         smp_store_release(&saved_tcpv4_prot, prot);
 980                 }
 981                 mutex_unlock(&tcpv4_prot_mutex);
 982         }
 983 }
 984
 985 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 986                          const struct proto *base)
 987 {
 988         prot[TLS_BASE][TLS_BASE] = *base;
 989         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 990         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 991         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 992
 993         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 994         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 995         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 996
 997         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 998         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 999         prot[TLS_BASE][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
1000         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
1001
1002         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
1003         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
1004         prot[TLS_SW][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
1005         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
1006
1007 #ifdef CONFIG_TLS_DEVICE
1008         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
1009         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
1010         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
1011
1012         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
1013         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
1014         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
1015
1016         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
1017
1018         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
1019
1020         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
1021 #endif
1022 #ifdef CONFIG_TLS_TOE
1023         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
1024         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_toe_hash;
1025         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_toe_unhash;
1026 #endif
1027 }
1028
1029 static int tls_init(struct sock *sk)
1030 {
1031         struct tls_context *ctx;
1032         int rc = 0;
1033
1034         tls_build_proto(sk);
1035
1036 #ifdef CONFIG_TLS_TOE
1037         if (tls_toe_bypass(sk))
1038                 return 0;
1039 #endif
1040
1041         /* The TLS ulp is currently supported only for TCP sockets
1042          * in ESTABLISHED state.
1043          * Supporting sockets in LISTEN state will require us
1044          * to modify the accept implementation to clone rather then
1045          * share the ulp context.
1046          */
1047         if (sk->sk_state != TCP_ESTABLISHED)
1048                 return -ENOTCONN;
1049
1050         /* allocate tls context */
1051         write_lock_bh(&sk->sk_callback_lock);
1052         ctx = tls_ctx_create(sk);
1053         if (!ctx) {
1054                 rc = -ENOMEM;
1055                 goto out;
1056         }
1057
1058         ctx->tx_conf = TLS_BASE;
1059         ctx->rx_conf = TLS_BASE;
1060         update_sk_prot(sk, ctx);
1061 out:
1062         write_unlock_bh(&sk->sk_callback_lock);
1063         return rc;
1064 }
1065
1066 static void tls_update(struct sock *sk, struct proto *p,
1067                        void (*write_space)(struct sock *sk))
1068 {
1069         struct tls_context *ctx;
1070
1071         WARN_ON_ONCE(sk->sk_prot == p);
1072
1073         ctx = tls_get_ctx(sk);
1074         if (likely(ctx)) {
1075                 ctx->sk_write_space = write_space;
1076                 ctx->sk_proto = p;
1077         } else {
1078                 /* Pairs with lockless read in sk_clone_lock(). */
1079                 WRITE_ONCE(sk->sk_prot, p);
1080                 sk->sk_write_space = write_space;
1081         }
1082 }
1083
1084 static u16 tls_user_config(struct tls_context *ctx, bool tx)
1085 {
1086         u16 config = tx ? ctx->tx_conf : ctx->rx_conf;
1087
1088         switch (config) {
1089         case TLS_BASE:
1090                 return TLS_CONF_BASE;
1091         case TLS_SW:
1092                 return TLS_CONF_SW;
1093         case TLS_HW:
1094                 return TLS_CONF_HW;
1095         case TLS_HW_RECORD:
1096                 return TLS_CONF_HW_RECORD;
1097         }
1098         return 0;
1099 }
1100
1101 static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
1102 {
1103         u16 version, cipher_type;
1104         struct tls_context *ctx;
1105         struct nlattr *start;
1106         int err;
1107
1108         start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
1109         if (!start)
1110                 return -EMSGSIZE;
1111
1112         rcu_read_lock();
1113         ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
1114         if (!ctx) {
1115                 err = 0;
1116                 goto nla_failure;
1117         }
1118         version = ctx->prot_info.version;
1119         if (version) {
1120                 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
1121                 if (err)
1122                         goto nla_failure;
1123         }
1124         cipher_type = ctx->prot_info.cipher_type;
1125         if (cipher_type) {
1126                 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
1127                 if (err)
1128                         goto nla_failure;
1129         }
1130         err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
1131         if (err)
1132                 goto nla_failure;
1133
1134         err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
1135         if (err)
1136                 goto nla_failure;
1137
1138         if (ctx->tx_conf == TLS_HW && ctx->zerocopy_sendfile) {
1139                 err = nla_put_flag(skb, TLS_INFO_ZC_RO_TX);
1140                 if (err)
1141                         goto nla_failure;
1142         }
1143         if (ctx->rx_no_pad) {
1144                 err = nla_put_flag(skb, TLS_INFO_RX_NO_PAD);
1145                 if (err)
1146                         goto nla_failure;
1147         }
1148
1149         rcu_read_unlock();
1150         nla_nest_end(skb, start);
1151         return 0;
1152
1153 nla_failure:
1154         rcu_read_unlock();
1155         nla_nest_cancel(skb, start);
1156         return err;
1157 }
1158
1159 static size_t tls_get_info_size(const struct sock *sk)
1160 {
1161         size_t size = 0;
1162
1163         size += nla_total_size(0) +             /* INET_ULP_INFO_TLS */
1164                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_VERSION */
1165                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_CIPHER */
1166                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_RXCONF */
1167                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_TXCONF */
1168                 nla_total_size(0) +             /* TLS_INFO_ZC_RO_TX */
1169                 nla_total_size(0) +             /* TLS_INFO_RX_NO_PAD */
1170                 0;
1171
1172         return size;
1173 }
1174
1175 static int __net_init tls_init_net(struct net *net)
1176 {
1177         int err;
1178
1179         net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
1180         if (!net->mib.tls_statistics)
1181                 return -ENOMEM;
1182
1183         err = tls_proc_init(net);
1184         if (err)
1185                 goto err_free_stats;
1186
1187         return 0;
1188 err_free_stats:
1189         free_percpu(net->mib.tls_statistics);
1190         return err;
1191 }
1192
1193 static void __net_exit tls_exit_net(struct net *net)
1194 {
1195         tls_proc_fini(net);
1196         free_percpu(net->mib.tls_statistics);
1197 }
1198
1199 static struct pernet_operations tls_proc_ops = {
1200         .init = tls_init_net,
1201         .exit = tls_exit_net,
1202 };
1203
1204 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
1205         .name                   = "tls",
1206         .owner                  = THIS_MODULE,
1207         .init                   = tls_init,
1208         .update                 = tls_update,
1209         .get_info               = tls_get_info,
1210         .get_info_size          = tls_get_info_size,
1211 };
1212
1213 static int __init tls_register(void)
1214 {
1215         int err;
1216
1217         err = register_pernet_subsys(&tls_proc_ops);
1218         if (err)
1219                 return err;
1220
1221         err = tls_strp_dev_init();
1222         if (err)
1223                 goto err_pernet;
1224
1225         err = tls_device_init();
1226         if (err)
1227                 goto err_strp;
1228
1229         tcp_register_ulp(&tcp_tls_ulp_ops);
1230
1231         return 0;
1232 err_strp:
1233         tls_strp_dev_exit();
1234 err_pernet:
1235         unregister_pernet_subsys(&tls_proc_ops);
1236         return err;
1237 }
1238
1239 static void __exit tls_unregister(void)
1240 {
1241         tcp_unregister_ulp(&tcp_tls_ulp_ops);
1242         tls_strp_dev_exit();
1243         tls_device_cleanup();
1244         unregister_pernet_subsys(&tls_proc_ops);
1245 }
1246
1247 module_init(tls_register);
1248 module_exit(tls_unregister);