net/tls/tls_main.c

   1 /*
   2  * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
   3  * Copyright (c) 2016-2017, Dave Watson <[email protected]>. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/module.h>
  35
  36 #include <net/tcp.h>
  37 #include <net/inet_common.h>
  38 #include <linux/highmem.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/sched/signal.h>
  41 #include <linux/inetdevice.h>
  42 #include <linux/inet_diag.h>
  43
  44 #include <net/snmp.h>
  45 #include <net/tls.h>
  46 #include <net/tls_toe.h>
  47
  48 #include "tls.h"
  49
  50 MODULE_AUTHOR("Mellanox Technologies");
  51 MODULE_DESCRIPTION("Transport Layer Security Support");
  52 MODULE_LICENSE("Dual BSD/GPL");
  53 MODULE_ALIAS_TCP_ULP("tls");
  54
  55 enum {
  56         TLSV4,
  57         TLSV6,
  58         TLS_NUM_PROTS,
  59 };
  60
  61 #define CHECK_CIPHER_DESC(cipher,ci)                            \
  62         static_assert(cipher ## _IV_SIZE <= TLS_MAX_IV_SIZE);           \
  63         static_assert(cipher ## _SALT_SIZE <= TLS_MAX_SALT_SIZE);               \
  64         static_assert(cipher ## _REC_SEQ_SIZE <= TLS_MAX_REC_SEQ_SIZE); \
  65         static_assert(cipher ## _TAG_SIZE == TLS_TAG_SIZE);             \
  66         static_assert(sizeof_field(struct ci, iv) == cipher ## _IV_SIZE);       \
  67         static_assert(sizeof_field(struct ci, key) == cipher ## _KEY_SIZE);     \
  68         static_assert(sizeof_field(struct ci, salt) == cipher ## _SALT_SIZE);   \
  69         static_assert(sizeof_field(struct ci, rec_seq) == cipher ## _REC_SEQ_SIZE);
  70
  71 #define __CIPHER_DESC(ci) \
  72         .iv_offset = offsetof(struct ci, iv), \
  73         .key_offset = offsetof(struct ci, key), \
  74         .salt_offset = offsetof(struct ci, salt), \
  75         .rec_seq_offset = offsetof(struct ci, rec_seq), \
  76         .crypto_info = sizeof(struct ci)
  77
  78 #define CIPHER_DESC(cipher,ci,algname,_offloadable) [cipher - TLS_CIPHER_MIN] = {       \
  79         .nonce = cipher ## _IV_SIZE, \
  80         .iv = cipher ## _IV_SIZE, \
  81         .key = cipher ## _KEY_SIZE, \
  82         .salt = cipher ## _SALT_SIZE, \
  83         .tag = cipher ## _TAG_SIZE, \
  84         .rec_seq = cipher ## _REC_SEQ_SIZE, \
  85         .cipher_name = algname, \
  86         .offloadable = _offloadable, \
  87         __CIPHER_DESC(ci), \
  88 }
  89
  90 #define CIPHER_DESC_NONCE0(cipher,ci,algname,_offloadable) [cipher - TLS_CIPHER_MIN] = { \
  91         .nonce = 0, \
  92         .iv = cipher ## _IV_SIZE, \
  93         .key = cipher ## _KEY_SIZE, \
  94         .salt = cipher ## _SALT_SIZE, \
  95         .tag = cipher ## _TAG_SIZE, \
  96         .rec_seq = cipher ## _REC_SEQ_SIZE, \
  97         .cipher_name = algname, \
  98         .offloadable = _offloadable, \
  99         __CIPHER_DESC(ci), \
 100 }
 101
 102 const struct tls_cipher_desc tls_cipher_desc[TLS_CIPHER_MAX + 1 - TLS_CIPHER_MIN] = {
 103         CIPHER_DESC(TLS_CIPHER_AES_GCM_128, tls12_crypto_info_aes_gcm_128, "gcm(aes)", true),
 104         CIPHER_DESC(TLS_CIPHER_AES_GCM_256, tls12_crypto_info_aes_gcm_256, "gcm(aes)", true),
 105         CIPHER_DESC(TLS_CIPHER_AES_CCM_128, tls12_crypto_info_aes_ccm_128, "ccm(aes)", false),
 106         CIPHER_DESC_NONCE0(TLS_CIPHER_CHACHA20_POLY1305, tls12_crypto_info_chacha20_poly1305, "rfc7539(chacha20,poly1305)", false),
 107         CIPHER_DESC(TLS_CIPHER_SM4_GCM, tls12_crypto_info_sm4_gcm, "gcm(sm4)", false),
 108         CIPHER_DESC(TLS_CIPHER_SM4_CCM, tls12_crypto_info_sm4_ccm, "ccm(sm4)", false),
 109         CIPHER_DESC(TLS_CIPHER_ARIA_GCM_128, tls12_crypto_info_aria_gcm_128, "gcm(aria)", false),
 110         CIPHER_DESC(TLS_CIPHER_ARIA_GCM_256, tls12_crypto_info_aria_gcm_256, "gcm(aria)", false),
 111 };
 112
 113 CHECK_CIPHER_DESC(TLS_CIPHER_AES_GCM_128, tls12_crypto_info_aes_gcm_128);
 114 CHECK_CIPHER_DESC(TLS_CIPHER_AES_GCM_256, tls12_crypto_info_aes_gcm_256);
 115 CHECK_CIPHER_DESC(TLS_CIPHER_AES_CCM_128, tls12_crypto_info_aes_ccm_128);
 116 CHECK_CIPHER_DESC(TLS_CIPHER_CHACHA20_POLY1305, tls12_crypto_info_chacha20_poly1305);
 117 CHECK_CIPHER_DESC(TLS_CIPHER_SM4_GCM, tls12_crypto_info_sm4_gcm);
 118 CHECK_CIPHER_DESC(TLS_CIPHER_SM4_CCM, tls12_crypto_info_sm4_ccm);
 119 CHECK_CIPHER_DESC(TLS_CIPHER_ARIA_GCM_128, tls12_crypto_info_aria_gcm_128);
 120 CHECK_CIPHER_DESC(TLS_CIPHER_ARIA_GCM_256, tls12_crypto_info_aria_gcm_256);
 121
 122 static const struct proto *saved_tcpv6_prot;
 123 static DEFINE_MUTEX(tcpv6_prot_mutex);
 124 static const struct proto *saved_tcpv4_prot;
 125 static DEFINE_MUTEX(tcpv4_prot_mutex);
 126 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
 127 static struct proto_ops tls_proto_ops[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
 128 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 129                          const struct proto *base);
 130
 131 void update_sk_prot(struct sock *sk, struct tls_context *ctx)
 132 {
 133         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 134
 135         WRITE_ONCE(sk->sk_prot,
 136                    &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]);
 137         WRITE_ONCE(sk->sk_socket->ops,
 138                    &tls_proto_ops[ip_ver][ctx->tx_conf][ctx->rx_conf]);
 139 }
 140
 141 int wait_on_pending_writer(struct sock *sk, long *timeo)
 142 {
 143         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 144         int ret, rc = 0;
 145
 146         add_wait_queue(sk_sleep(sk), &wait);
 147         while (1) {
 148                 if (!*timeo) {
 149                         rc = -EAGAIN;
 150                         break;
 151                 }
 152
 153                 if (signal_pending(current)) {
 154                         rc = sock_intr_errno(*timeo);
 155                         break;
 156                 }
 157
 158                 ret = sk_wait_event(sk, timeo,
 159                                     !READ_ONCE(sk->sk_write_pending), &wait);
 160                 if (ret) {
 161                         if (ret < 0)
 162                                 rc = ret;
 163                         break;
 164                 }
 165         }
 166         remove_wait_queue(sk_sleep(sk), &wait);
 167         return rc;
 168 }
 169
 170 int tls_push_sg(struct sock *sk,
 171                 struct tls_context *ctx,
 172                 struct scatterlist *sg,
 173                 u16 first_offset,
 174                 int flags)
 175 {
 176         struct bio_vec bvec;
 177         struct msghdr msg = {
 178                 .msg_flags = MSG_SPLICE_PAGES | flags,
 179         };
 180         int ret = 0;
 181         struct page *p;
 182         size_t size;
 183         int offset = first_offset;
 184
 185         size = sg->length - offset;
 186         offset += sg->offset;
 187
 188         ctx->splicing_pages = true;
 189         while (1) {
 190                 /* is sending application-limited? */
 191                 tcp_rate_check_app_limited(sk);
 192                 p = sg_page(sg);
 193 retry:
 194                 bvec_set_page(&bvec, p, size, offset);
 195                 iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size);
 196
 197                 ret = tcp_sendmsg_locked(sk, &msg, size);
 198
 199                 if (ret != size) {
 200                         if (ret > 0) {
 201                                 offset += ret;
 202                                 size -= ret;
 203                                 goto retry;
 204                         }
 205
 206                         offset -= sg->offset;
 207                         ctx->partially_sent_offset = offset;
 208                         ctx->partially_sent_record = (void *)sg;
 209                         ctx->splicing_pages = false;
 210                         return ret;
 211                 }
 212
 213                 put_page(p);
 214                 sk_mem_uncharge(sk, sg->length);
 215                 sg = sg_next(sg);
 216                 if (!sg)
 217                         break;
 218
 219                 offset = sg->offset;
 220                 size = sg->length;
 221         }
 222
 223         ctx->splicing_pages = false;
 224
 225         return 0;
 226 }
 227
 228 static int tls_handle_open_record(struct sock *sk, int flags)
 229 {
 230         struct tls_context *ctx = tls_get_ctx(sk);
 231
 232         if (tls_is_pending_open_record(ctx))
 233                 return ctx->push_pending_record(sk, flags);
 234
 235         return 0;
 236 }
 237
 238 int tls_process_cmsg(struct sock *sk, struct msghdr *msg,
 239                      unsigned char *record_type)
 240 {
 241         struct cmsghdr *cmsg;
 242         int rc = -EINVAL;
 243
 244         for_each_cmsghdr(cmsg, msg) {
 245                 if (!CMSG_OK(msg, cmsg))
 246                         return -EINVAL;
 247                 if (cmsg->cmsg_level != SOL_TLS)
 248                         continue;
 249
 250                 switch (cmsg->cmsg_type) {
 251                 case TLS_SET_RECORD_TYPE:
 252                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 253                                 return -EINVAL;
 254
 255                         if (msg->msg_flags & MSG_MORE)
 256                                 return -EINVAL;
 257
 258                         rc = tls_handle_open_record(sk, msg->msg_flags);
 259                         if (rc)
 260                                 return rc;
 261
 262                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 263                         rc = 0;
 264                         break;
 265                 default:
 266                         return -EINVAL;
 267                 }
 268         }
 269
 270         return rc;
 271 }
 272
 273 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 274                             int flags)
 275 {
 276         struct scatterlist *sg;
 277         u16 offset;
 278
 279         sg = ctx->partially_sent_record;
 280         offset = ctx->partially_sent_offset;
 281
 282         ctx->partially_sent_record = NULL;
 283         return tls_push_sg(sk, ctx, sg, offset, flags);
 284 }
 285
 286 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
 287 {
 288         struct scatterlist *sg;
 289
 290         for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
 291                 put_page(sg_page(sg));
 292                 sk_mem_uncharge(sk, sg->length);
 293         }
 294         ctx->partially_sent_record = NULL;
 295 }
 296
 297 static void tls_write_space(struct sock *sk)
 298 {
 299         struct tls_context *ctx = tls_get_ctx(sk);
 300
 301         /* If splicing_pages call lower protocol write space handler
 302          * to ensure we wake up any waiting operations there. For example
 303          * if splicing pages where to call sk_wait_event.
 304          */
 305         if (ctx->splicing_pages) {
 306                 ctx->sk_write_space(sk);
 307                 return;
 308         }
 309
 310 #ifdef CONFIG_TLS_DEVICE
 311         if (ctx->tx_conf == TLS_HW)
 312                 tls_device_write_space(sk, ctx);
 313         else
 314 #endif
 315                 tls_sw_write_space(sk, ctx);
 316
 317         ctx->sk_write_space(sk);
 318 }
 319
 320 /**
 321  * tls_ctx_free() - free TLS ULP context
 322  * @sk:  socket to with @ctx is attached
 323  * @ctx: TLS context structure
 324  *
 325  * Free TLS context. If @sk is %NULL caller guarantees that the socket
 326  * to which @ctx was attached has no outstanding references.
 327  */
 328 void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
 329 {
 330         if (!ctx)
 331                 return;
 332
 333         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 334         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 335         mutex_destroy(&ctx->tx_lock);
 336
 337         if (sk)
 338                 kfree_rcu(ctx, rcu);
 339         else
 340                 kfree(ctx);
 341 }
 342
 343 static void tls_sk_proto_cleanup(struct sock *sk,
 344                                  struct tls_context *ctx, long timeo)
 345 {
 346         if (unlikely(sk->sk_write_pending) &&
 347             !wait_on_pending_writer(sk, &timeo))
 348                 tls_handle_open_record(sk, 0);
 349
 350         /* We need these for tls_sw_fallback handling of other packets */
 351         if (ctx->tx_conf == TLS_SW) {
 352                 tls_sw_release_resources_tx(sk);
 353                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 354         } else if (ctx->tx_conf == TLS_HW) {
 355                 tls_device_free_resources_tx(sk);
 356                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 357         }
 358
 359         if (ctx->rx_conf == TLS_SW) {
 360                 tls_sw_release_resources_rx(sk);
 361                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 362         } else if (ctx->rx_conf == TLS_HW) {
 363                 tls_device_offload_cleanup_rx(sk);
 364                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 365         }
 366 }
 367
 368 static void tls_sk_proto_close(struct sock *sk, long timeout)
 369 {
 370         struct inet_connection_sock *icsk = inet_csk(sk);
 371         struct tls_context *ctx = tls_get_ctx(sk);
 372         long timeo = sock_sndtimeo(sk, 0);
 373         bool free_ctx;
 374
 375         if (ctx->tx_conf == TLS_SW)
 376                 tls_sw_cancel_work_tx(ctx);
 377
 378         lock_sock(sk);
 379         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 380
 381         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 382                 tls_sk_proto_cleanup(sk, ctx, timeo);
 383
 384         write_lock_bh(&sk->sk_callback_lock);
 385         if (free_ctx)
 386                 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 387         WRITE_ONCE(sk->sk_prot, ctx->sk_proto);
 388         if (sk->sk_write_space == tls_write_space)
 389                 sk->sk_write_space = ctx->sk_write_space;
 390         write_unlock_bh(&sk->sk_callback_lock);
 391         release_sock(sk);
 392         if (ctx->tx_conf == TLS_SW)
 393                 tls_sw_free_ctx_tx(ctx);
 394         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 395                 tls_sw_strparser_done(ctx);
 396         if (ctx->rx_conf == TLS_SW)
 397                 tls_sw_free_ctx_rx(ctx);
 398         ctx->sk_proto->close(sk, timeout);
 399
 400         if (free_ctx)
 401                 tls_ctx_free(sk, ctx);
 402 }
 403
 404 static __poll_t tls_sk_poll(struct file *file, struct socket *sock,
 405                             struct poll_table_struct *wait)
 406 {
 407         struct tls_sw_context_rx *ctx;
 408         struct tls_context *tls_ctx;
 409         struct sock *sk = sock->sk;
 410         struct sk_psock *psock;
 411         __poll_t mask = 0;
 412         u8 shutdown;
 413         int state;
 414
 415         mask = tcp_poll(file, sock, wait);
 416
 417         state = inet_sk_state_load(sk);
 418         shutdown = READ_ONCE(sk->sk_shutdown);
 419         if (unlikely(state != TCP_ESTABLISHED || shutdown & RCV_SHUTDOWN))
 420                 return mask;
 421
 422         tls_ctx = tls_get_ctx(sk);
 423         ctx = tls_sw_ctx_rx(tls_ctx);
 424         psock = sk_psock_get(sk);
 425
 426         if (skb_queue_empty_lockless(&ctx->rx_list) &&
 427             !tls_strp_msg_ready(ctx) &&
 428             sk_psock_queue_empty(psock))
 429                 mask &= ~(EPOLLIN | EPOLLRDNORM);
 430
 431         if (psock)
 432                 sk_psock_put(sk, psock);
 433
 434         return mask;
 435 }
 436
 437 static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
 438                                   int __user *optlen, int tx)
 439 {
 440         int rc = 0;
 441         const struct tls_cipher_desc *cipher_desc;
 442         struct tls_context *ctx = tls_get_ctx(sk);
 443         struct tls_crypto_info *crypto_info;
 444         struct cipher_context *cctx;
 445         int len;
 446
 447         if (get_user(len, optlen))
 448                 return -EFAULT;
 449
 450         if (!optval || (len < sizeof(*crypto_info))) {
 451                 rc = -EINVAL;
 452                 goto out;
 453         }
 454
 455         if (!ctx) {
 456                 rc = -EBUSY;
 457                 goto out;
 458         }
 459
 460         /* get user crypto info */
 461         if (tx) {
 462                 crypto_info = &ctx->crypto_send.info;
 463                 cctx = &ctx->tx;
 464         } else {
 465                 crypto_info = &ctx->crypto_recv.info;
 466                 cctx = &ctx->rx;
 467         }
 468
 469         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 470                 rc = -EBUSY;
 471                 goto out;
 472         }
 473
 474         if (len == sizeof(*crypto_info)) {
 475                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 476                         rc = -EFAULT;
 477                 goto out;
 478         }
 479
 480         cipher_desc = get_cipher_desc(crypto_info->cipher_type);
 481         if (!cipher_desc || len != cipher_desc->crypto_info) {
 482                 rc = -EINVAL;
 483                 goto out;
 484         }
 485
 486         memcpy(crypto_info_iv(crypto_info, cipher_desc),
 487                cctx->iv + cipher_desc->salt, cipher_desc->iv);
 488         memcpy(crypto_info_rec_seq(crypto_info, cipher_desc),
 489                cctx->rec_seq, cipher_desc->rec_seq);
 490
 491         if (copy_to_user(optval, crypto_info, cipher_desc->crypto_info))
 492                 rc = -EFAULT;
 493
 494 out:
 495         return rc;
 496 }
 497
 498 static int do_tls_getsockopt_tx_zc(struct sock *sk, char __user *optval,
 499                                    int __user *optlen)
 500 {
 501         struct tls_context *ctx = tls_get_ctx(sk);
 502         unsigned int value;
 503         int len;
 504
 505         if (get_user(len, optlen))
 506                 return -EFAULT;
 507
 508         if (len != sizeof(value))
 509                 return -EINVAL;
 510
 511         value = ctx->zerocopy_sendfile;
 512         if (copy_to_user(optval, &value, sizeof(value)))
 513                 return -EFAULT;
 514
 515         return 0;
 516 }
 517
 518 static int do_tls_getsockopt_no_pad(struct sock *sk, char __user *optval,
 519                                     int __user *optlen)
 520 {
 521         struct tls_context *ctx = tls_get_ctx(sk);
 522         int value, len;
 523
 524         if (ctx->prot_info.version != TLS_1_3_VERSION)
 525                 return -EINVAL;
 526
 527         if (get_user(len, optlen))
 528                 return -EFAULT;
 529         if (len < sizeof(value))
 530                 return -EINVAL;
 531
 532         value = -EINVAL;
 533         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 534                 value = ctx->rx_no_pad;
 535         if (value < 0)
 536                 return value;
 537
 538         if (put_user(sizeof(value), optlen))
 539                 return -EFAULT;
 540         if (copy_to_user(optval, &value, sizeof(value)))
 541                 return -EFAULT;
 542
 543         return 0;
 544 }
 545
 546 static int do_tls_getsockopt(struct sock *sk, int optname,
 547                              char __user *optval, int __user *optlen)
 548 {
 549         int rc = 0;
 550
 551         lock_sock(sk);
 552
 553         switch (optname) {
 554         case TLS_TX:
 555         case TLS_RX:
 556                 rc = do_tls_getsockopt_conf(sk, optval, optlen,
 557                                             optname == TLS_TX);
 558                 break;
 559         case TLS_TX_ZEROCOPY_RO:
 560                 rc = do_tls_getsockopt_tx_zc(sk, optval, optlen);
 561                 break;
 562         case TLS_RX_EXPECT_NO_PAD:
 563                 rc = do_tls_getsockopt_no_pad(sk, optval, optlen);
 564                 break;
 565         default:
 566                 rc = -ENOPROTOOPT;
 567                 break;
 568         }
 569
 570         release_sock(sk);
 571
 572         return rc;
 573 }
 574
 575 static int tls_getsockopt(struct sock *sk, int level, int optname,
 576                           char __user *optval, int __user *optlen)
 577 {
 578         struct tls_context *ctx = tls_get_ctx(sk);
 579
 580         if (level != SOL_TLS)
 581                 return ctx->sk_proto->getsockopt(sk, level,
 582                                                  optname, optval, optlen);
 583
 584         return do_tls_getsockopt(sk, optname, optval, optlen);
 585 }
 586
 587 static int validate_crypto_info(const struct tls_crypto_info *crypto_info,
 588                                 const struct tls_crypto_info *alt_crypto_info)
 589 {
 590         if (crypto_info->version != TLS_1_2_VERSION &&
 591             crypto_info->version != TLS_1_3_VERSION)
 592                 return -EINVAL;
 593
 594         switch (crypto_info->cipher_type) {
 595         case TLS_CIPHER_ARIA_GCM_128:
 596         case TLS_CIPHER_ARIA_GCM_256:
 597                 if (crypto_info->version != TLS_1_2_VERSION)
 598                         return -EINVAL;
 599                 break;
 600         }
 601
 602         /* Ensure that TLS version and ciphers are same in both directions */
 603         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 604                 if (alt_crypto_info->version != crypto_info->version ||
 605                     alt_crypto_info->cipher_type != crypto_info->cipher_type)
 606                         return -EINVAL;
 607         }
 608
 609         return 0;
 610 }
 611
 612 static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
 613                                   unsigned int optlen, int tx)
 614 {
 615         struct tls_crypto_info *crypto_info;
 616         struct tls_crypto_info *alt_crypto_info;
 617         struct tls_context *ctx = tls_get_ctx(sk);
 618         const struct tls_cipher_desc *cipher_desc;
 619         int rc = 0;
 620         int conf;
 621
 622         if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info)))
 623                 return -EINVAL;
 624
 625         if (tx) {
 626                 crypto_info = &ctx->crypto_send.info;
 627                 alt_crypto_info = &ctx->crypto_recv.info;
 628         } else {
 629                 crypto_info = &ctx->crypto_recv.info;
 630                 alt_crypto_info = &ctx->crypto_send.info;
 631         }
 632
 633         /* Currently we don't support set crypto info more than one time */
 634         if (TLS_CRYPTO_INFO_READY(crypto_info))
 635                 return -EBUSY;
 636
 637         rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
 638         if (rc) {
 639                 rc = -EFAULT;
 640                 goto err_crypto_info;
 641         }
 642
 643         rc = validate_crypto_info(crypto_info, alt_crypto_info);
 644         if (rc)
 645                 goto err_crypto_info;
 646
 647         cipher_desc = get_cipher_desc(crypto_info->cipher_type);
 648         if (!cipher_desc) {
 649                 rc = -EINVAL;
 650                 goto err_crypto_info;
 651         }
 652
 653         if (optlen != cipher_desc->crypto_info) {
 654                 rc = -EINVAL;
 655                 goto err_crypto_info;
 656         }
 657
 658         rc = copy_from_sockptr_offset(crypto_info + 1, optval,
 659                                       sizeof(*crypto_info),
 660                                       optlen - sizeof(*crypto_info));
 661         if (rc) {
 662                 rc = -EFAULT;
 663                 goto err_crypto_info;
 664         }
 665
 666         if (tx) {
 667                 rc = tls_set_device_offload(sk);
 668                 conf = TLS_HW;
 669                 if (!rc) {
 670                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
 671                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 672                 } else {
 673                         rc = tls_set_sw_offload(sk, 1);
 674                         if (rc)
 675                                 goto err_crypto_info;
 676                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
 677                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 678                         conf = TLS_SW;
 679                 }
 680         } else {
 681                 rc = tls_set_device_offload_rx(sk, ctx);
 682                 conf = TLS_HW;
 683                 if (!rc) {
 684                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
 685                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 686                 } else {
 687                         rc = tls_set_sw_offload(sk, 0);
 688                         if (rc)
 689                                 goto err_crypto_info;
 690                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
 691                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 692                         conf = TLS_SW;
 693                 }
 694                 tls_sw_strparser_arm(sk, ctx);
 695         }
 696
 697         if (tx)
 698                 ctx->tx_conf = conf;
 699         else
 700                 ctx->rx_conf = conf;
 701         update_sk_prot(sk, ctx);
 702         if (tx) {
 703                 ctx->sk_write_space = sk->sk_write_space;
 704                 sk->sk_write_space = tls_write_space;
 705         } else {
 706                 struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(ctx);
 707
 708                 tls_strp_check_rcv(&rx_ctx->strp);
 709         }
 710         return 0;
 711
 712 err_crypto_info:
 713         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 714         return rc;
 715 }
 716
 717 static int do_tls_setsockopt_tx_zc(struct sock *sk, sockptr_t optval,
 718                                    unsigned int optlen)
 719 {
 720         struct tls_context *ctx = tls_get_ctx(sk);
 721         unsigned int value;
 722
 723         if (sockptr_is_null(optval) || optlen != sizeof(value))
 724                 return -EINVAL;
 725
 726         if (copy_from_sockptr(&value, optval, sizeof(value)))
 727                 return -EFAULT;
 728
 729         if (value > 1)
 730                 return -EINVAL;
 731
 732         ctx->zerocopy_sendfile = value;
 733
 734         return 0;
 735 }
 736
 737 static int do_tls_setsockopt_no_pad(struct sock *sk, sockptr_t optval,
 738                                     unsigned int optlen)
 739 {
 740         struct tls_context *ctx = tls_get_ctx(sk);
 741         u32 val;
 742         int rc;
 743
 744         if (ctx->prot_info.version != TLS_1_3_VERSION ||
 745             sockptr_is_null(optval) || optlen < sizeof(val))
 746                 return -EINVAL;
 747
 748         rc = copy_from_sockptr(&val, optval, sizeof(val));
 749         if (rc)
 750                 return -EFAULT;
 751         if (val > 1)
 752                 return -EINVAL;
 753         rc = check_zeroed_sockptr(optval, sizeof(val), optlen - sizeof(val));
 754         if (rc < 1)
 755                 return rc == 0 ? -EINVAL : rc;
 756
 757         lock_sock(sk);
 758         rc = -EINVAL;
 759         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) {
 760                 ctx->rx_no_pad = val;
 761                 tls_update_rx_zc_capable(ctx);
 762                 rc = 0;
 763         }
 764         release_sock(sk);
 765
 766         return rc;
 767 }
 768
 769 static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
 770                              unsigned int optlen)
 771 {
 772         int rc = 0;
 773
 774         switch (optname) {
 775         case TLS_TX:
 776         case TLS_RX:
 777                 lock_sock(sk);
 778                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 779                                             optname == TLS_TX);
 780                 release_sock(sk);
 781                 break;
 782         case TLS_TX_ZEROCOPY_RO:
 783                 lock_sock(sk);
 784                 rc = do_tls_setsockopt_tx_zc(sk, optval, optlen);
 785                 release_sock(sk);
 786                 break;
 787         case TLS_RX_EXPECT_NO_PAD:
 788                 rc = do_tls_setsockopt_no_pad(sk, optval, optlen);
 789                 break;
 790         default:
 791                 rc = -ENOPROTOOPT;
 792                 break;
 793         }
 794         return rc;
 795 }
 796
 797 static int tls_setsockopt(struct sock *sk, int level, int optname,
 798                           sockptr_t optval, unsigned int optlen)
 799 {
 800         struct tls_context *ctx = tls_get_ctx(sk);
 801
 802         if (level != SOL_TLS)
 803                 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
 804                                                  optlen);
 805
 806         return do_tls_setsockopt(sk, optname, optval, optlen);
 807 }
 808
 809 struct tls_context *tls_ctx_create(struct sock *sk)
 810 {
 811         struct inet_connection_sock *icsk = inet_csk(sk);
 812         struct tls_context *ctx;
 813
 814         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 815         if (!ctx)
 816                 return NULL;
 817
 818         mutex_init(&ctx->tx_lock);
 819         ctx->sk_proto = READ_ONCE(sk->sk_prot);
 820         ctx->sk = sk;
 821         /* Release semantic of rcu_assign_pointer() ensures that
 822          * ctx->sk_proto is visible before changing sk->sk_prot in
 823          * update_sk_prot(), and prevents reading uninitialized value in
 824          * tls_{getsockopt, setsockopt}. Note that we do not need a
 825          * read barrier in tls_{getsockopt,setsockopt} as there is an
 826          * address dependency between sk->sk_proto->{getsockopt,setsockopt}
 827          * and ctx->sk_proto.
 828          */
 829         rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 830         return ctx;
 831 }
 832
 833 static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 834                             const struct proto_ops *base)
 835 {
 836         ops[TLS_BASE][TLS_BASE] = *base;
 837
 838         ops[TLS_SW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 839         ops[TLS_SW  ][TLS_BASE].splice_eof      = tls_sw_splice_eof;
 840
 841         ops[TLS_BASE][TLS_SW  ] = ops[TLS_BASE][TLS_BASE];
 842         ops[TLS_BASE][TLS_SW  ].splice_read     = tls_sw_splice_read;
 843         ops[TLS_BASE][TLS_SW  ].poll            = tls_sk_poll;
 844         ops[TLS_BASE][TLS_SW  ].read_sock       = tls_sw_read_sock;
 845
 846         ops[TLS_SW  ][TLS_SW  ] = ops[TLS_SW  ][TLS_BASE];
 847         ops[TLS_SW  ][TLS_SW  ].splice_read     = tls_sw_splice_read;
 848         ops[TLS_SW  ][TLS_SW  ].poll            = tls_sk_poll;
 849         ops[TLS_SW  ][TLS_SW  ].read_sock       = tls_sw_read_sock;
 850
 851 #ifdef CONFIG_TLS_DEVICE
 852         ops[TLS_HW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 853
 854         ops[TLS_HW  ][TLS_SW  ] = ops[TLS_BASE][TLS_SW  ];
 855
 856         ops[TLS_BASE][TLS_HW  ] = ops[TLS_BASE][TLS_SW  ];
 857
 858         ops[TLS_SW  ][TLS_HW  ] = ops[TLS_SW  ][TLS_SW  ];
 859
 860         ops[TLS_HW  ][TLS_HW  ] = ops[TLS_HW  ][TLS_SW  ];
 861 #endif
 862 #ifdef CONFIG_TLS_TOE
 863         ops[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 864 #endif
 865 }
 866
 867 static void tls_build_proto(struct sock *sk)
 868 {
 869         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 870         struct proto *prot = READ_ONCE(sk->sk_prot);
 871
 872         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 873         if (ip_ver == TLSV6 &&
 874             unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
 875                 mutex_lock(&tcpv6_prot_mutex);
 876                 if (likely(prot != saved_tcpv6_prot)) {
 877                         build_protos(tls_prots[TLSV6], prot);
 878                         build_proto_ops(tls_proto_ops[TLSV6],
 879                                         sk->sk_socket->ops);
 880                         smp_store_release(&saved_tcpv6_prot, prot);
 881                 }
 882                 mutex_unlock(&tcpv6_prot_mutex);
 883         }
 884
 885         if (ip_ver == TLSV4 &&
 886             unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
 887                 mutex_lock(&tcpv4_prot_mutex);
 888                 if (likely(prot != saved_tcpv4_prot)) {
 889                         build_protos(tls_prots[TLSV4], prot);
 890                         build_proto_ops(tls_proto_ops[TLSV4],
 891                                         sk->sk_socket->ops);
 892                         smp_store_release(&saved_tcpv4_prot, prot);
 893                 }
 894                 mutex_unlock(&tcpv4_prot_mutex);
 895         }
 896 }
 897
 898 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 899                          const struct proto *base)
 900 {
 901         prot[TLS_BASE][TLS_BASE] = *base;
 902         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 903         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 904         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 905
 906         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 907         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 908         prot[TLS_SW][TLS_BASE].splice_eof       = tls_sw_splice_eof;
 909
 910         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 911         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 912         prot[TLS_BASE][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
 913         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 914
 915         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 916         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 917         prot[TLS_SW][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
 918         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 919
 920 #ifdef CONFIG_TLS_DEVICE
 921         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 922         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 923         prot[TLS_HW][TLS_BASE].splice_eof       = tls_device_splice_eof;
 924
 925         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 926         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 927         prot[TLS_HW][TLS_SW].splice_eof         = tls_device_splice_eof;
 928
 929         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 930
 931         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 932
 933         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 934 #endif
 935 #ifdef CONFIG_TLS_TOE
 936         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 937         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_toe_hash;
 938         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_toe_unhash;
 939 #endif
 940 }
 941
 942 static int tls_init(struct sock *sk)
 943 {
 944         struct tls_context *ctx;
 945         int rc = 0;
 946
 947         tls_build_proto(sk);
 948
 949 #ifdef CONFIG_TLS_TOE
 950         if (tls_toe_bypass(sk))
 951                 return 0;
 952 #endif
 953
 954         /* The TLS ulp is currently supported only for TCP sockets
 955          * in ESTABLISHED state.
 956          * Supporting sockets in LISTEN state will require us
 957          * to modify the accept implementation to clone rather then
 958          * share the ulp context.
 959          */
 960         if (sk->sk_state != TCP_ESTABLISHED)
 961                 return -ENOTCONN;
 962
 963         /* allocate tls context */
 964         write_lock_bh(&sk->sk_callback_lock);
 965         ctx = tls_ctx_create(sk);
 966         if (!ctx) {
 967                 rc = -ENOMEM;
 968                 goto out;
 969         }
 970
 971         ctx->tx_conf = TLS_BASE;
 972         ctx->rx_conf = TLS_BASE;
 973         update_sk_prot(sk, ctx);
 974 out:
 975         write_unlock_bh(&sk->sk_callback_lock);
 976         return rc;
 977 }
 978
 979 static void tls_update(struct sock *sk, struct proto *p,
 980                        void (*write_space)(struct sock *sk))
 981 {
 982         struct tls_context *ctx;
 983
 984         WARN_ON_ONCE(sk->sk_prot == p);
 985
 986         ctx = tls_get_ctx(sk);
 987         if (likely(ctx)) {
 988                 ctx->sk_write_space = write_space;
 989                 ctx->sk_proto = p;
 990         } else {
 991                 /* Pairs with lockless read in sk_clone_lock(). */
 992                 WRITE_ONCE(sk->sk_prot, p);
 993                 sk->sk_write_space = write_space;
 994         }
 995 }
 996
 997 static u16 tls_user_config(struct tls_context *ctx, bool tx)
 998 {
 999         u16 config = tx ? ctx->tx_conf : ctx->rx_conf;
1000
1001         switch (config) {
1002         case TLS_BASE:
1003                 return TLS_CONF_BASE;
1004         case TLS_SW:
1005                 return TLS_CONF_SW;
1006         case TLS_HW:
1007                 return TLS_CONF_HW;
1008         case TLS_HW_RECORD:
1009                 return TLS_CONF_HW_RECORD;
1010         }
1011         return 0;
1012 }
1013
1014 static int tls_get_info(struct sock *sk, struct sk_buff *skb)
1015 {
1016         u16 version, cipher_type;
1017         struct tls_context *ctx;
1018         struct nlattr *start;
1019         int err;
1020
1021         start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
1022         if (!start)
1023                 return -EMSGSIZE;
1024
1025         rcu_read_lock();
1026         ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
1027         if (!ctx) {
1028                 err = 0;
1029                 goto nla_failure;
1030         }
1031         version = ctx->prot_info.version;
1032         if (version) {
1033                 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
1034                 if (err)
1035                         goto nla_failure;
1036         }
1037         cipher_type = ctx->prot_info.cipher_type;
1038         if (cipher_type) {
1039                 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
1040                 if (err)
1041                         goto nla_failure;
1042         }
1043         err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
1044         if (err)
1045                 goto nla_failure;
1046
1047         err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
1048         if (err)
1049                 goto nla_failure;
1050
1051         if (ctx->tx_conf == TLS_HW && ctx->zerocopy_sendfile) {
1052                 err = nla_put_flag(skb, TLS_INFO_ZC_RO_TX);
1053                 if (err)
1054                         goto nla_failure;
1055         }
1056         if (ctx->rx_no_pad) {
1057                 err = nla_put_flag(skb, TLS_INFO_RX_NO_PAD);
1058                 if (err)
1059                         goto nla_failure;
1060         }
1061
1062         rcu_read_unlock();
1063         nla_nest_end(skb, start);
1064         return 0;
1065
1066 nla_failure:
1067         rcu_read_unlock();
1068         nla_nest_cancel(skb, start);
1069         return err;
1070 }
1071
1072 static size_t tls_get_info_size(const struct sock *sk)
1073 {
1074         size_t size = 0;
1075
1076         size += nla_total_size(0) +             /* INET_ULP_INFO_TLS */
1077                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_VERSION */
1078                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_CIPHER */
1079                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_RXCONF */
1080                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_TXCONF */
1081                 nla_total_size(0) +             /* TLS_INFO_ZC_RO_TX */
1082                 nla_total_size(0) +             /* TLS_INFO_RX_NO_PAD */
1083                 0;
1084
1085         return size;
1086 }
1087
1088 static int __net_init tls_init_net(struct net *net)
1089 {
1090         int err;
1091
1092         net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
1093         if (!net->mib.tls_statistics)
1094                 return -ENOMEM;
1095
1096         err = tls_proc_init(net);
1097         if (err)
1098                 goto err_free_stats;
1099
1100         return 0;
1101 err_free_stats:
1102         free_percpu(net->mib.tls_statistics);
1103         return err;
1104 }
1105
1106 static void __net_exit tls_exit_net(struct net *net)
1107 {
1108         tls_proc_fini(net);
1109         free_percpu(net->mib.tls_statistics);
1110 }
1111
1112 static struct pernet_operations tls_proc_ops = {
1113         .init = tls_init_net,
1114         .exit = tls_exit_net,
1115 };
1116
1117 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
1118         .name                   = "tls",
1119         .owner                  = THIS_MODULE,
1120         .init                   = tls_init,
1121         .update                 = tls_update,
1122         .get_info               = tls_get_info,
1123         .get_info_size          = tls_get_info_size,
1124 };
1125
1126 static int __init tls_register(void)
1127 {
1128         int err;
1129
1130         err = register_pernet_subsys(&tls_proc_ops);
1131         if (err)
1132                 return err;
1133
1134         err = tls_strp_dev_init();
1135         if (err)
1136                 goto err_pernet;
1137
1138         err = tls_device_init();
1139         if (err)
1140                 goto err_strp;
1141
1142         tcp_register_ulp(&tcp_tls_ulp_ops);
1143
1144         return 0;
1145 err_strp:
1146         tls_strp_dev_exit();
1147 err_pernet:
1148         unregister_pernet_subsys(&tls_proc_ops);
1149         return err;
1150 }
1151
1152 static void __exit tls_unregister(void)
1153 {
1154         tcp_unregister_ulp(&tcp_tls_ulp_ops);
1155         tls_strp_dev_exit();
1156         tls_device_cleanup();
1157         unregister_pernet_subsys(&tls_proc_ops);
1158 }
1159
1160 module_init(tls_register);
1161 module_exit(tls_unregister);