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_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                 /* is sending application-limited? */
 143                 tcp_rate_check_app_limited(sk);
 144                 p = sg_page(sg);
 145 retry:
 146                 bvec_set_page(&bvec, p, size, offset);
 147                 iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size);
 148
 149                 ret = tcp_sendmsg_locked(sk, &msg, size);
 150
 151                 if (ret != size) {
 152                         if (ret > 0) {
 153                                 offset += ret;
 154                                 size -= ret;
 155                                 goto retry;
 156                         }
 157
 158                         offset -= sg->offset;
 159                         ctx->partially_sent_offset = offset;
 160                         ctx->partially_sent_record = (void *)sg;
 161                         ctx->splicing_pages = false;
 162                         return ret;
 163                 }
 164
 165                 put_page(p);
 166                 sk_mem_uncharge(sk, sg->length);
 167                 sg = sg_next(sg);
 168                 if (!sg)
 169                         break;
 170
 171                 offset = sg->offset;
 172                 size = sg->length;
 173         }
 174
 175         ctx->splicing_pages = false;
 176
 177         return 0;
 178 }
 179
 180 static int tls_handle_open_record(struct sock *sk, int flags)
 181 {
 182         struct tls_context *ctx = tls_get_ctx(sk);
 183
 184         if (tls_is_pending_open_record(ctx))
 185                 return ctx->push_pending_record(sk, flags);
 186
 187         return 0;
 188 }
 189
 190 int tls_process_cmsg(struct sock *sk, struct msghdr *msg,
 191                      unsigned char *record_type)
 192 {
 193         struct cmsghdr *cmsg;
 194         int rc = -EINVAL;
 195
 196         for_each_cmsghdr(cmsg, msg) {
 197                 if (!CMSG_OK(msg, cmsg))
 198                         return -EINVAL;
 199                 if (cmsg->cmsg_level != SOL_TLS)
 200                         continue;
 201
 202                 switch (cmsg->cmsg_type) {
 203                 case TLS_SET_RECORD_TYPE:
 204                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 205                                 return -EINVAL;
 206
 207                         if (msg->msg_flags & MSG_MORE)
 208                                 return -EINVAL;
 209
 210                         rc = tls_handle_open_record(sk, msg->msg_flags);
 211                         if (rc)
 212                                 return rc;
 213
 214                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 215                         rc = 0;
 216                         break;
 217                 default:
 218                         return -EINVAL;
 219                 }
 220         }
 221
 222         return rc;
 223 }
 224
 225 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 226                             int flags)
 227 {
 228         struct scatterlist *sg;
 229         u16 offset;
 230
 231         sg = ctx->partially_sent_record;
 232         offset = ctx->partially_sent_offset;
 233
 234         ctx->partially_sent_record = NULL;
 235         return tls_push_sg(sk, ctx, sg, offset, flags);
 236 }
 237
 238 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
 239 {
 240         struct scatterlist *sg;
 241
 242         for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
 243                 put_page(sg_page(sg));
 244                 sk_mem_uncharge(sk, sg->length);
 245         }
 246         ctx->partially_sent_record = NULL;
 247 }
 248
 249 static void tls_write_space(struct sock *sk)
 250 {
 251         struct tls_context *ctx = tls_get_ctx(sk);
 252
 253         /* If splicing_pages call lower protocol write space handler
 254          * to ensure we wake up any waiting operations there. For example
 255          * if splicing pages where to call sk_wait_event.
 256          */
 257         if (ctx->splicing_pages) {
 258                 ctx->sk_write_space(sk);
 259                 return;
 260         }
 261
 262 #ifdef CONFIG_TLS_DEVICE
 263         if (ctx->tx_conf == TLS_HW)
 264                 tls_device_write_space(sk, ctx);
 265         else
 266 #endif
 267                 tls_sw_write_space(sk, ctx);
 268
 269         ctx->sk_write_space(sk);
 270 }
 271
 272 /**
 273  * tls_ctx_free() - free TLS ULP context
 274  * @sk:  socket to with @ctx is attached
 275  * @ctx: TLS context structure
 276  *
 277  * Free TLS context. If @sk is %NULL caller guarantees that the socket
 278  * to which @ctx was attached has no outstanding references.
 279  */
 280 void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
 281 {
 282         if (!ctx)
 283                 return;
 284
 285         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 286         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 287         mutex_destroy(&ctx->tx_lock);
 288
 289         if (sk)
 290                 kfree_rcu(ctx, rcu);
 291         else
 292                 kfree(ctx);
 293 }
 294
 295 static void tls_sk_proto_cleanup(struct sock *sk,
 296                                  struct tls_context *ctx, long timeo)
 297 {
 298         if (unlikely(sk->sk_write_pending) &&
 299             !wait_on_pending_writer(sk, &timeo))
 300                 tls_handle_open_record(sk, 0);
 301
 302         /* We need these for tls_sw_fallback handling of other packets */
 303         if (ctx->tx_conf == TLS_SW) {
 304                 kfree(ctx->tx.rec_seq);
 305                 kfree(ctx->tx.iv);
 306                 tls_sw_release_resources_tx(sk);
 307                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 308         } else if (ctx->tx_conf == TLS_HW) {
 309                 tls_device_free_resources_tx(sk);
 310                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 311         }
 312
 313         if (ctx->rx_conf == TLS_SW) {
 314                 tls_sw_release_resources_rx(sk);
 315                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 316         } else if (ctx->rx_conf == TLS_HW) {
 317                 tls_device_offload_cleanup_rx(sk);
 318                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 319         }
 320 }
 321
 322 static void tls_sk_proto_close(struct sock *sk, long timeout)
 323 {
 324         struct inet_connection_sock *icsk = inet_csk(sk);
 325         struct tls_context *ctx = tls_get_ctx(sk);
 326         long timeo = sock_sndtimeo(sk, 0);
 327         bool free_ctx;
 328
 329         if (ctx->tx_conf == TLS_SW)
 330                 tls_sw_cancel_work_tx(ctx);
 331
 332         lock_sock(sk);
 333         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 334
 335         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 336                 tls_sk_proto_cleanup(sk, ctx, timeo);
 337
 338         write_lock_bh(&sk->sk_callback_lock);
 339         if (free_ctx)
 340                 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 341         WRITE_ONCE(sk->sk_prot, ctx->sk_proto);
 342         if (sk->sk_write_space == tls_write_space)
 343                 sk->sk_write_space = ctx->sk_write_space;
 344         write_unlock_bh(&sk->sk_callback_lock);
 345         release_sock(sk);
 346         if (ctx->tx_conf == TLS_SW)
 347                 tls_sw_free_ctx_tx(ctx);
 348         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 349                 tls_sw_strparser_done(ctx);
 350         if (ctx->rx_conf == TLS_SW)
 351                 tls_sw_free_ctx_rx(ctx);
 352         ctx->sk_proto->close(sk, timeout);
 353
 354         if (free_ctx)
 355                 tls_ctx_free(sk, ctx);
 356 }
 357
 358 static __poll_t tls_sk_poll(struct file *file, struct socket *sock,
 359                             struct poll_table_struct *wait)
 360 {
 361         struct tls_sw_context_rx *ctx;
 362         struct tls_context *tls_ctx;
 363         struct sock *sk = sock->sk;
 364         struct sk_psock *psock;
 365         __poll_t mask = 0;
 366         u8 shutdown;
 367         int state;
 368
 369         mask = tcp_poll(file, sock, wait);
 370
 371         state = inet_sk_state_load(sk);
 372         shutdown = READ_ONCE(sk->sk_shutdown);
 373         if (unlikely(state != TCP_ESTABLISHED || shutdown & RCV_SHUTDOWN))
 374                 return mask;
 375
 376         tls_ctx = tls_get_ctx(sk);
 377         ctx = tls_sw_ctx_rx(tls_ctx);
 378         psock = sk_psock_get(sk);
 379
 380         if (skb_queue_empty_lockless(&ctx->rx_list) &&
 381             !tls_strp_msg_ready(ctx) &&
 382             sk_psock_queue_empty(psock))
 383                 mask &= ~(EPOLLIN | EPOLLRDNORM);
 384
 385         if (psock)
 386                 sk_psock_put(sk, psock);
 387
 388         return mask;
 389 }
 390
 391 static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
 392                                   int __user *optlen, int tx)
 393 {
 394         int rc = 0;
 395         struct tls_context *ctx = tls_get_ctx(sk);
 396         struct tls_crypto_info *crypto_info;
 397         struct cipher_context *cctx;
 398         int len;
 399
 400         if (get_user(len, optlen))
 401                 return -EFAULT;
 402
 403         if (!optval || (len < sizeof(*crypto_info))) {
 404                 rc = -EINVAL;
 405                 goto out;
 406         }
 407
 408         if (!ctx) {
 409                 rc = -EBUSY;
 410                 goto out;
 411         }
 412
 413         /* get user crypto info */
 414         if (tx) {
 415                 crypto_info = &ctx->crypto_send.info;
 416                 cctx = &ctx->tx;
 417         } else {
 418                 crypto_info = &ctx->crypto_recv.info;
 419                 cctx = &ctx->rx;
 420         }
 421
 422         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 423                 rc = -EBUSY;
 424                 goto out;
 425         }
 426
 427         if (len == sizeof(*crypto_info)) {
 428                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 429                         rc = -EFAULT;
 430                 goto out;
 431         }
 432
 433         switch (crypto_info->cipher_type) {
 434         case TLS_CIPHER_AES_GCM_128: {
 435                 struct tls12_crypto_info_aes_gcm_128 *
 436                   crypto_info_aes_gcm_128 =
 437                   container_of(crypto_info,
 438                                struct tls12_crypto_info_aes_gcm_128,
 439                                info);
 440
 441                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 442                         rc = -EINVAL;
 443                         goto out;
 444                 }
 445                 memcpy(crypto_info_aes_gcm_128->iv,
 446                        cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 447                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 448                 memcpy(crypto_info_aes_gcm_128->rec_seq, cctx->rec_seq,
 449                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 450                 if (copy_to_user(optval,
 451                                  crypto_info_aes_gcm_128,
 452                                  sizeof(*crypto_info_aes_gcm_128)))
 453                         rc = -EFAULT;
 454                 break;
 455         }
 456         case TLS_CIPHER_AES_GCM_256: {
 457                 struct tls12_crypto_info_aes_gcm_256 *
 458                   crypto_info_aes_gcm_256 =
 459                   container_of(crypto_info,
 460                                struct tls12_crypto_info_aes_gcm_256,
 461                                info);
 462
 463                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 464                         rc = -EINVAL;
 465                         goto out;
 466                 }
 467                 memcpy(crypto_info_aes_gcm_256->iv,
 468                        cctx->iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 469                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 470                 memcpy(crypto_info_aes_gcm_256->rec_seq, cctx->rec_seq,
 471                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 472                 if (copy_to_user(optval,
 473                                  crypto_info_aes_gcm_256,
 474                                  sizeof(*crypto_info_aes_gcm_256)))
 475                         rc = -EFAULT;
 476                 break;
 477         }
 478         case TLS_CIPHER_AES_CCM_128: {
 479                 struct tls12_crypto_info_aes_ccm_128 *aes_ccm_128 =
 480                         container_of(crypto_info,
 481                                 struct tls12_crypto_info_aes_ccm_128, info);
 482
 483                 if (len != sizeof(*aes_ccm_128)) {
 484                         rc = -EINVAL;
 485                         goto out;
 486                 }
 487                 memcpy(aes_ccm_128->iv,
 488                        cctx->iv + TLS_CIPHER_AES_CCM_128_SALT_SIZE,
 489                        TLS_CIPHER_AES_CCM_128_IV_SIZE);
 490                 memcpy(aes_ccm_128->rec_seq, cctx->rec_seq,
 491                        TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE);
 492                 if (copy_to_user(optval, aes_ccm_128, sizeof(*aes_ccm_128)))
 493                         rc = -EFAULT;
 494                 break;
 495         }
 496         case TLS_CIPHER_CHACHA20_POLY1305: {
 497                 struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305 =
 498                         container_of(crypto_info,
 499                                 struct tls12_crypto_info_chacha20_poly1305,
 500                                 info);
 501
 502                 if (len != sizeof(*chacha20_poly1305)) {
 503                         rc = -EINVAL;
 504                         goto out;
 505                 }
 506                 memcpy(chacha20_poly1305->iv,
 507                        cctx->iv + TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE,
 508                        TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);
 509                 memcpy(chacha20_poly1305->rec_seq, cctx->rec_seq,
 510                        TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE);
 511                 if (copy_to_user(optval, chacha20_poly1305,
 512                                 sizeof(*chacha20_poly1305)))
 513                         rc = -EFAULT;
 514                 break;
 515         }
 516         case TLS_CIPHER_SM4_GCM: {
 517                 struct tls12_crypto_info_sm4_gcm *sm4_gcm_info =
 518                         container_of(crypto_info,
 519                                 struct tls12_crypto_info_sm4_gcm, info);
 520
 521                 if (len != sizeof(*sm4_gcm_info)) {
 522                         rc = -EINVAL;
 523                         goto out;
 524                 }
 525                 memcpy(sm4_gcm_info->iv,
 526                        cctx->iv + TLS_CIPHER_SM4_GCM_SALT_SIZE,
 527                        TLS_CIPHER_SM4_GCM_IV_SIZE);
 528                 memcpy(sm4_gcm_info->rec_seq, cctx->rec_seq,
 529                        TLS_CIPHER_SM4_GCM_REC_SEQ_SIZE);
 530                 if (copy_to_user(optval, sm4_gcm_info, sizeof(*sm4_gcm_info)))
 531                         rc = -EFAULT;
 532                 break;
 533         }
 534         case TLS_CIPHER_SM4_CCM: {
 535                 struct tls12_crypto_info_sm4_ccm *sm4_ccm_info =
 536                         container_of(crypto_info,
 537                                 struct tls12_crypto_info_sm4_ccm, info);
 538
 539                 if (len != sizeof(*sm4_ccm_info)) {
 540                         rc = -EINVAL;
 541                         goto out;
 542                 }
 543                 memcpy(sm4_ccm_info->iv,
 544                        cctx->iv + TLS_CIPHER_SM4_CCM_SALT_SIZE,
 545                        TLS_CIPHER_SM4_CCM_IV_SIZE);
 546                 memcpy(sm4_ccm_info->rec_seq, cctx->rec_seq,
 547                        TLS_CIPHER_SM4_CCM_REC_SEQ_SIZE);
 548                 if (copy_to_user(optval, sm4_ccm_info, sizeof(*sm4_ccm_info)))
 549                         rc = -EFAULT;
 550                 break;
 551         }
 552         case TLS_CIPHER_ARIA_GCM_128: {
 553                 struct tls12_crypto_info_aria_gcm_128 *
 554                   crypto_info_aria_gcm_128 =
 555                   container_of(crypto_info,
 556                                struct tls12_crypto_info_aria_gcm_128,
 557                                info);
 558
 559                 if (len != sizeof(*crypto_info_aria_gcm_128)) {
 560                         rc = -EINVAL;
 561                         goto out;
 562                 }
 563                 memcpy(crypto_info_aria_gcm_128->iv,
 564                        cctx->iv + TLS_CIPHER_ARIA_GCM_128_SALT_SIZE,
 565                        TLS_CIPHER_ARIA_GCM_128_IV_SIZE);
 566                 memcpy(crypto_info_aria_gcm_128->rec_seq, cctx->rec_seq,
 567                        TLS_CIPHER_ARIA_GCM_128_REC_SEQ_SIZE);
 568                 if (copy_to_user(optval,
 569                                  crypto_info_aria_gcm_128,
 570                                  sizeof(*crypto_info_aria_gcm_128)))
 571                         rc = -EFAULT;
 572                 break;
 573         }
 574         case TLS_CIPHER_ARIA_GCM_256: {
 575                 struct tls12_crypto_info_aria_gcm_256 *
 576                   crypto_info_aria_gcm_256 =
 577                   container_of(crypto_info,
 578                                struct tls12_crypto_info_aria_gcm_256,
 579                                info);
 580
 581                 if (len != sizeof(*crypto_info_aria_gcm_256)) {
 582                         rc = -EINVAL;
 583                         goto out;
 584                 }
 585                 memcpy(crypto_info_aria_gcm_256->iv,
 586                        cctx->iv + TLS_CIPHER_ARIA_GCM_256_SALT_SIZE,
 587                        TLS_CIPHER_ARIA_GCM_256_IV_SIZE);
 588                 memcpy(crypto_info_aria_gcm_256->rec_seq, cctx->rec_seq,
 589                        TLS_CIPHER_ARIA_GCM_256_REC_SEQ_SIZE);
 590                 if (copy_to_user(optval,
 591                                  crypto_info_aria_gcm_256,
 592                                  sizeof(*crypto_info_aria_gcm_256)))
 593                         rc = -EFAULT;
 594                 break;
 595         }
 596         default:
 597                 rc = -EINVAL;
 598         }
 599
 600 out:
 601         return rc;
 602 }
 603
 604 static int do_tls_getsockopt_tx_zc(struct sock *sk, char __user *optval,
 605                                    int __user *optlen)
 606 {
 607         struct tls_context *ctx = tls_get_ctx(sk);
 608         unsigned int value;
 609         int len;
 610
 611         if (get_user(len, optlen))
 612                 return -EFAULT;
 613
 614         if (len != sizeof(value))
 615                 return -EINVAL;
 616
 617         value = ctx->zerocopy_sendfile;
 618         if (copy_to_user(optval, &value, sizeof(value)))
 619                 return -EFAULT;
 620
 621         return 0;
 622 }
 623
 624 static int do_tls_getsockopt_no_pad(struct sock *sk, char __user *optval,
 625                                     int __user *optlen)
 626 {
 627         struct tls_context *ctx = tls_get_ctx(sk);
 628         int value, len;
 629
 630         if (ctx->prot_info.version != TLS_1_3_VERSION)
 631                 return -EINVAL;
 632
 633         if (get_user(len, optlen))
 634                 return -EFAULT;
 635         if (len < sizeof(value))
 636                 return -EINVAL;
 637
 638         value = -EINVAL;
 639         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 640                 value = ctx->rx_no_pad;
 641         if (value < 0)
 642                 return value;
 643
 644         if (put_user(sizeof(value), optlen))
 645                 return -EFAULT;
 646         if (copy_to_user(optval, &value, sizeof(value)))
 647                 return -EFAULT;
 648
 649         return 0;
 650 }
 651
 652 static int do_tls_getsockopt(struct sock *sk, int optname,
 653                              char __user *optval, int __user *optlen)
 654 {
 655         int rc = 0;
 656
 657         lock_sock(sk);
 658
 659         switch (optname) {
 660         case TLS_TX:
 661         case TLS_RX:
 662                 rc = do_tls_getsockopt_conf(sk, optval, optlen,
 663                                             optname == TLS_TX);
 664                 break;
 665         case TLS_TX_ZEROCOPY_RO:
 666                 rc = do_tls_getsockopt_tx_zc(sk, optval, optlen);
 667                 break;
 668         case TLS_RX_EXPECT_NO_PAD:
 669                 rc = do_tls_getsockopt_no_pad(sk, optval, optlen);
 670                 break;
 671         default:
 672                 rc = -ENOPROTOOPT;
 673                 break;
 674         }
 675
 676         release_sock(sk);
 677
 678         return rc;
 679 }
 680
 681 static int tls_getsockopt(struct sock *sk, int level, int optname,
 682                           char __user *optval, int __user *optlen)
 683 {
 684         struct tls_context *ctx = tls_get_ctx(sk);
 685
 686         if (level != SOL_TLS)
 687                 return ctx->sk_proto->getsockopt(sk, level,
 688                                                  optname, optval, optlen);
 689
 690         return do_tls_getsockopt(sk, optname, optval, optlen);
 691 }
 692
 693 static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
 694                                   unsigned int optlen, int tx)
 695 {
 696         struct tls_crypto_info *crypto_info;
 697         struct tls_crypto_info *alt_crypto_info;
 698         struct tls_context *ctx = tls_get_ctx(sk);
 699         size_t optsize;
 700         int rc = 0;
 701         int conf;
 702
 703         if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info)))
 704                 return -EINVAL;
 705
 706         if (tx) {
 707                 crypto_info = &ctx->crypto_send.info;
 708                 alt_crypto_info = &ctx->crypto_recv.info;
 709         } else {
 710                 crypto_info = &ctx->crypto_recv.info;
 711                 alt_crypto_info = &ctx->crypto_send.info;
 712         }
 713
 714         /* Currently we don't support set crypto info more than one time */
 715         if (TLS_CRYPTO_INFO_READY(crypto_info))
 716                 return -EBUSY;
 717
 718         rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
 719         if (rc) {
 720                 rc = -EFAULT;
 721                 goto err_crypto_info;
 722         }
 723
 724         /* check version */
 725         if (crypto_info->version != TLS_1_2_VERSION &&
 726             crypto_info->version != TLS_1_3_VERSION) {
 727                 rc = -EINVAL;
 728                 goto err_crypto_info;
 729         }
 730
 731         /* Ensure that TLS version and ciphers are same in both directions */
 732         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 733                 if (alt_crypto_info->version != crypto_info->version ||
 734                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 735                         rc = -EINVAL;
 736                         goto err_crypto_info;
 737                 }
 738         }
 739
 740         switch (crypto_info->cipher_type) {
 741         case TLS_CIPHER_AES_GCM_128:
 742                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 743                 break;
 744         case TLS_CIPHER_AES_GCM_256: {
 745                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 746                 break;
 747         }
 748         case TLS_CIPHER_AES_CCM_128:
 749                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 750                 break;
 751         case TLS_CIPHER_CHACHA20_POLY1305:
 752                 optsize = sizeof(struct tls12_crypto_info_chacha20_poly1305);
 753                 break;
 754         case TLS_CIPHER_SM4_GCM:
 755                 optsize = sizeof(struct tls12_crypto_info_sm4_gcm);
 756                 break;
 757         case TLS_CIPHER_SM4_CCM:
 758                 optsize = sizeof(struct tls12_crypto_info_sm4_ccm);
 759                 break;
 760         case TLS_CIPHER_ARIA_GCM_128:
 761                 if (crypto_info->version != TLS_1_2_VERSION) {
 762                         rc = -EINVAL;
 763                         goto err_crypto_info;
 764                 }
 765                 optsize = sizeof(struct tls12_crypto_info_aria_gcm_128);
 766                 break;
 767         case TLS_CIPHER_ARIA_GCM_256:
 768                 if (crypto_info->version != TLS_1_2_VERSION) {
 769                         rc = -EINVAL;
 770                         goto err_crypto_info;
 771                 }
 772                 optsize = sizeof(struct tls12_crypto_info_aria_gcm_256);
 773                 break;
 774         default:
 775                 rc = -EINVAL;
 776                 goto err_crypto_info;
 777         }
 778
 779         if (optlen != optsize) {
 780                 rc = -EINVAL;
 781                 goto err_crypto_info;
 782         }
 783
 784         rc = copy_from_sockptr_offset(crypto_info + 1, optval,
 785                                       sizeof(*crypto_info),
 786                                       optlen - sizeof(*crypto_info));
 787         if (rc) {
 788                 rc = -EFAULT;
 789                 goto err_crypto_info;
 790         }
 791
 792         if (tx) {
 793                 rc = tls_set_device_offload(sk, ctx);
 794                 conf = TLS_HW;
 795                 if (!rc) {
 796                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
 797                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 798                 } else {
 799                         rc = tls_set_sw_offload(sk, ctx, 1);
 800                         if (rc)
 801                                 goto err_crypto_info;
 802                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
 803                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 804                         conf = TLS_SW;
 805                 }
 806         } else {
 807                 rc = tls_set_device_offload_rx(sk, ctx);
 808                 conf = TLS_HW;
 809                 if (!rc) {
 810                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
 811                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 812                 } else {
 813                         rc = tls_set_sw_offload(sk, ctx, 0);
 814                         if (rc)
 815                                 goto err_crypto_info;
 816                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
 817                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 818                         conf = TLS_SW;
 819                 }
 820                 tls_sw_strparser_arm(sk, ctx);
 821         }
 822
 823         if (tx)
 824                 ctx->tx_conf = conf;
 825         else
 826                 ctx->rx_conf = conf;
 827         update_sk_prot(sk, ctx);
 828         if (tx) {
 829                 ctx->sk_write_space = sk->sk_write_space;
 830                 sk->sk_write_space = tls_write_space;
 831         } else {
 832                 struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(ctx);
 833
 834                 tls_strp_check_rcv(&rx_ctx->strp);
 835         }
 836         return 0;
 837
 838 err_crypto_info:
 839         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 840         return rc;
 841 }
 842
 843 static int do_tls_setsockopt_tx_zc(struct sock *sk, sockptr_t optval,
 844                                    unsigned int optlen)
 845 {
 846         struct tls_context *ctx = tls_get_ctx(sk);
 847         unsigned int value;
 848
 849         if (sockptr_is_null(optval) || optlen != sizeof(value))
 850                 return -EINVAL;
 851
 852         if (copy_from_sockptr(&value, optval, sizeof(value)))
 853                 return -EFAULT;
 854
 855         if (value > 1)
 856                 return -EINVAL;
 857
 858         ctx->zerocopy_sendfile = value;
 859
 860         return 0;
 861 }
 862
 863 static int do_tls_setsockopt_no_pad(struct sock *sk, sockptr_t optval,
 864                                     unsigned int optlen)
 865 {
 866         struct tls_context *ctx = tls_get_ctx(sk);
 867         u32 val;
 868         int rc;
 869
 870         if (ctx->prot_info.version != TLS_1_3_VERSION ||
 871             sockptr_is_null(optval) || optlen < sizeof(val))
 872                 return -EINVAL;
 873
 874         rc = copy_from_sockptr(&val, optval, sizeof(val));
 875         if (rc)
 876                 return -EFAULT;
 877         if (val > 1)
 878                 return -EINVAL;
 879         rc = check_zeroed_sockptr(optval, sizeof(val), optlen - sizeof(val));
 880         if (rc < 1)
 881                 return rc == 0 ? -EINVAL : rc;
 882
 883         lock_sock(sk);
 884         rc = -EINVAL;
 885         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) {
 886                 ctx->rx_no_pad = val;
 887                 tls_update_rx_zc_capable(ctx);
 888                 rc = 0;
 889         }
 890         release_sock(sk);
 891
 892         return rc;
 893 }
 894
 895 static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
 896                              unsigned int optlen)
 897 {
 898         int rc = 0;
 899
 900         switch (optname) {
 901         case TLS_TX:
 902         case TLS_RX:
 903                 lock_sock(sk);
 904                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 905                                             optname == TLS_TX);
 906                 release_sock(sk);
 907                 break;
 908         case TLS_TX_ZEROCOPY_RO:
 909                 lock_sock(sk);
 910                 rc = do_tls_setsockopt_tx_zc(sk, optval, optlen);
 911                 release_sock(sk);
 912                 break;
 913         case TLS_RX_EXPECT_NO_PAD:
 914                 rc = do_tls_setsockopt_no_pad(sk, optval, optlen);
 915                 break;
 916         default:
 917                 rc = -ENOPROTOOPT;
 918                 break;
 919         }
 920         return rc;
 921 }
 922
 923 static int tls_setsockopt(struct sock *sk, int level, int optname,
 924                           sockptr_t optval, unsigned int optlen)
 925 {
 926         struct tls_context *ctx = tls_get_ctx(sk);
 927
 928         if (level != SOL_TLS)
 929                 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
 930                                                  optlen);
 931
 932         return do_tls_setsockopt(sk, optname, optval, optlen);
 933 }
 934
 935 struct tls_context *tls_ctx_create(struct sock *sk)
 936 {
 937         struct inet_connection_sock *icsk = inet_csk(sk);
 938         struct tls_context *ctx;
 939
 940         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 941         if (!ctx)
 942                 return NULL;
 943
 944         mutex_init(&ctx->tx_lock);
 945         rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 946         ctx->sk_proto = READ_ONCE(sk->sk_prot);
 947         ctx->sk = sk;
 948         return ctx;
 949 }
 950
 951 static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 952                             const struct proto_ops *base)
 953 {
 954         ops[TLS_BASE][TLS_BASE] = *base;
 955
 956         ops[TLS_SW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 957         ops[TLS_SW  ][TLS_BASE].splice_eof      = tls_sw_splice_eof;
 958
 959         ops[TLS_BASE][TLS_SW  ] = ops[TLS_BASE][TLS_BASE];
 960         ops[TLS_BASE][TLS_SW  ].splice_read     = tls_sw_splice_read;
 961         ops[TLS_BASE][TLS_SW  ].poll            = tls_sk_poll;
 962
 963         ops[TLS_SW  ][TLS_SW  ] = ops[TLS_SW  ][TLS_BASE];
 964         ops[TLS_SW  ][TLS_SW  ].splice_read     = tls_sw_splice_read;
 965         ops[TLS_SW  ][TLS_SW  ].poll            = tls_sk_poll;
 966
 967 #ifdef CONFIG_TLS_DEVICE
 968         ops[TLS_HW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 969
 970         ops[TLS_HW  ][TLS_SW  ] = ops[TLS_BASE][TLS_SW  ];
 971
 972         ops[TLS_BASE][TLS_HW  ] = ops[TLS_BASE][TLS_SW  ];
 973
 974         ops[TLS_SW  ][TLS_HW  ] = ops[TLS_SW  ][TLS_SW  ];
 975
 976         ops[TLS_HW  ][TLS_HW  ] = ops[TLS_HW  ][TLS_SW  ];
 977 #endif
 978 #ifdef CONFIG_TLS_TOE
 979         ops[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 980 #endif
 981 }
 982
 983 static void tls_build_proto(struct sock *sk)
 984 {
 985         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 986         struct proto *prot = READ_ONCE(sk->sk_prot);
 987
 988         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 989         if (ip_ver == TLSV6 &&
 990             unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
 991                 mutex_lock(&tcpv6_prot_mutex);
 992                 if (likely(prot != saved_tcpv6_prot)) {
 993                         build_protos(tls_prots[TLSV6], prot);
 994                         build_proto_ops(tls_proto_ops[TLSV6],
 995                                         sk->sk_socket->ops);
 996                         smp_store_release(&saved_tcpv6_prot, prot);
 997                 }
 998                 mutex_unlock(&tcpv6_prot_mutex);
 999         }
1000
1001         if (ip_ver == TLSV4 &&
1002             unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
1003                 mutex_lock(&tcpv4_prot_mutex);
1004                 if (likely(prot != saved_tcpv4_prot)) {
1005                         build_protos(tls_prots[TLSV4], prot);
1006                         build_proto_ops(tls_proto_ops[TLSV4],
1007                                         sk->sk_socket->ops);
1008                         smp_store_release(&saved_tcpv4_prot, prot);
1009                 }
1010                 mutex_unlock(&tcpv4_prot_mutex);
1011         }
1012 }
1013
1014 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
1015                          const struct proto *base)
1016 {
1017         prot[TLS_BASE][TLS_BASE] = *base;
1018         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
1019         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
1020         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
1021
1022         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
1023         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
1024         prot[TLS_SW][TLS_BASE].splice_eof       = tls_sw_splice_eof;
1025
1026         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
1027         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
1028         prot[TLS_BASE][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
1029         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
1030
1031         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
1032         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
1033         prot[TLS_SW][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
1034         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
1035
1036 #ifdef CONFIG_TLS_DEVICE
1037         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
1038         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
1039         prot[TLS_HW][TLS_BASE].splice_eof       = tls_device_splice_eof;
1040
1041         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
1042         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
1043         prot[TLS_HW][TLS_SW].splice_eof         = tls_device_splice_eof;
1044
1045         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
1046
1047         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
1048
1049         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
1050 #endif
1051 #ifdef CONFIG_TLS_TOE
1052         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
1053         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_toe_hash;
1054         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_toe_unhash;
1055 #endif
1056 }
1057
1058 static int tls_init(struct sock *sk)
1059 {
1060         struct tls_context *ctx;
1061         int rc = 0;
1062
1063         tls_build_proto(sk);
1064
1065 #ifdef CONFIG_TLS_TOE
1066         if (tls_toe_bypass(sk))
1067                 return 0;
1068 #endif
1069
1070         /* The TLS ulp is currently supported only for TCP sockets
1071          * in ESTABLISHED state.
1072          * Supporting sockets in LISTEN state will require us
1073          * to modify the accept implementation to clone rather then
1074          * share the ulp context.
1075          */
1076         if (sk->sk_state != TCP_ESTABLISHED)
1077                 return -ENOTCONN;
1078
1079         /* allocate tls context */
1080         write_lock_bh(&sk->sk_callback_lock);
1081         ctx = tls_ctx_create(sk);
1082         if (!ctx) {
1083                 rc = -ENOMEM;
1084                 goto out;
1085         }
1086
1087         ctx->tx_conf = TLS_BASE;
1088         ctx->rx_conf = TLS_BASE;
1089         update_sk_prot(sk, ctx);
1090 out:
1091         write_unlock_bh(&sk->sk_callback_lock);
1092         return rc;
1093 }
1094
1095 static void tls_update(struct sock *sk, struct proto *p,
1096                        void (*write_space)(struct sock *sk))
1097 {
1098         struct tls_context *ctx;
1099
1100         WARN_ON_ONCE(sk->sk_prot == p);
1101
1102         ctx = tls_get_ctx(sk);
1103         if (likely(ctx)) {
1104                 ctx->sk_write_space = write_space;
1105                 ctx->sk_proto = p;
1106         } else {
1107                 /* Pairs with lockless read in sk_clone_lock(). */
1108                 WRITE_ONCE(sk->sk_prot, p);
1109                 sk->sk_write_space = write_space;
1110         }
1111 }
1112
1113 static u16 tls_user_config(struct tls_context *ctx, bool tx)
1114 {
1115         u16 config = tx ? ctx->tx_conf : ctx->rx_conf;
1116
1117         switch (config) {
1118         case TLS_BASE:
1119                 return TLS_CONF_BASE;
1120         case TLS_SW:
1121                 return TLS_CONF_SW;
1122         case TLS_HW:
1123                 return TLS_CONF_HW;
1124         case TLS_HW_RECORD:
1125                 return TLS_CONF_HW_RECORD;
1126         }
1127         return 0;
1128 }
1129
1130 static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
1131 {
1132         u16 version, cipher_type;
1133         struct tls_context *ctx;
1134         struct nlattr *start;
1135         int err;
1136
1137         start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
1138         if (!start)
1139                 return -EMSGSIZE;
1140
1141         rcu_read_lock();
1142         ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
1143         if (!ctx) {
1144                 err = 0;
1145                 goto nla_failure;
1146         }
1147         version = ctx->prot_info.version;
1148         if (version) {
1149                 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
1150                 if (err)
1151                         goto nla_failure;
1152         }
1153         cipher_type = ctx->prot_info.cipher_type;
1154         if (cipher_type) {
1155                 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
1156                 if (err)
1157                         goto nla_failure;
1158         }
1159         err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
1160         if (err)
1161                 goto nla_failure;
1162
1163         err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
1164         if (err)
1165                 goto nla_failure;
1166
1167         if (ctx->tx_conf == TLS_HW && ctx->zerocopy_sendfile) {
1168                 err = nla_put_flag(skb, TLS_INFO_ZC_RO_TX);
1169                 if (err)
1170                         goto nla_failure;
1171         }
1172         if (ctx->rx_no_pad) {
1173                 err = nla_put_flag(skb, TLS_INFO_RX_NO_PAD);
1174                 if (err)
1175                         goto nla_failure;
1176         }
1177
1178         rcu_read_unlock();
1179         nla_nest_end(skb, start);
1180         return 0;
1181
1182 nla_failure:
1183         rcu_read_unlock();
1184         nla_nest_cancel(skb, start);
1185         return err;
1186 }
1187
1188 static size_t tls_get_info_size(const struct sock *sk)
1189 {
1190         size_t size = 0;
1191
1192         size += nla_total_size(0) +             /* INET_ULP_INFO_TLS */
1193                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_VERSION */
1194                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_CIPHER */
1195                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_RXCONF */
1196                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_TXCONF */
1197                 nla_total_size(0) +             /* TLS_INFO_ZC_RO_TX */
1198                 nla_total_size(0) +             /* TLS_INFO_RX_NO_PAD */
1199                 0;
1200
1201         return size;
1202 }
1203
1204 static int __net_init tls_init_net(struct net *net)
1205 {
1206         int err;
1207
1208         net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
1209         if (!net->mib.tls_statistics)
1210                 return -ENOMEM;
1211
1212         err = tls_proc_init(net);
1213         if (err)
1214                 goto err_free_stats;
1215
1216         return 0;
1217 err_free_stats:
1218         free_percpu(net->mib.tls_statistics);
1219         return err;
1220 }
1221
1222 static void __net_exit tls_exit_net(struct net *net)
1223 {
1224         tls_proc_fini(net);
1225         free_percpu(net->mib.tls_statistics);
1226 }
1227
1228 static struct pernet_operations tls_proc_ops = {
1229         .init = tls_init_net,
1230         .exit = tls_exit_net,
1231 };
1232
1233 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
1234         .name                   = "tls",
1235         .owner                  = THIS_MODULE,
1236         .init                   = tls_init,
1237         .update                 = tls_update,
1238         .get_info               = tls_get_info,
1239         .get_info_size          = tls_get_info_size,
1240 };
1241
1242 static int __init tls_register(void)
1243 {
1244         int err;
1245
1246         err = register_pernet_subsys(&tls_proc_ops);
1247         if (err)
1248                 return err;
1249
1250         err = tls_strp_dev_init();
1251         if (err)
1252                 goto err_pernet;
1253
1254         err = tls_device_init();
1255         if (err)
1256                 goto err_strp;
1257
1258         tcp_register_ulp(&tcp_tls_ulp_ops);
1259
1260         return 0;
1261 err_strp:
1262         tls_strp_dev_exit();
1263 err_pernet:
1264         unregister_pernet_subsys(&tls_proc_ops);
1265         return err;
1266 }
1267
1268 static void __exit tls_unregister(void)
1269 {
1270         tcp_unregister_ulp(&tcp_tls_ulp_ops);
1271         tls_strp_dev_exit();
1272         tls_device_cleanup();
1273         unregister_pernet_subsys(&tls_proc_ops);
1274 }
1275
1276 module_init(tls_register);
1277 module_exit(tls_unregister);