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 MODULE_AUTHOR("Mellanox Technologies");
  49 MODULE_DESCRIPTION("Transport Layer Security Support");
  50 MODULE_LICENSE("Dual BSD/GPL");
  51 MODULE_ALIAS_TCP_ULP("tls");
  52
  53 enum {
  54         TLSV4,
  55         TLSV6,
  56         TLS_NUM_PROTS,
  57 };
  58
  59 static const struct proto *saved_tcpv6_prot;
  60 static DEFINE_MUTEX(tcpv6_prot_mutex);
  61 static const struct proto *saved_tcpv4_prot;
  62 static DEFINE_MUTEX(tcpv4_prot_mutex);
  63 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  64 static struct proto_ops tls_proto_ops[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  65 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
  66                          const struct proto *base);
  67
  68 void update_sk_prot(struct sock *sk, struct tls_context *ctx)
  69 {
  70         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
  71
  72         WRITE_ONCE(sk->sk_prot,
  73                    &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]);
  74         WRITE_ONCE(sk->sk_socket->ops,
  75                    &tls_proto_ops[ip_ver][ctx->tx_conf][ctx->rx_conf]);
  76 }
  77
  78 int wait_on_pending_writer(struct sock *sk, long *timeo)
  79 {
  80         int rc = 0;
  81         DEFINE_WAIT_FUNC(wait, woken_wake_function);
  82
  83         add_wait_queue(sk_sleep(sk), &wait);
  84         while (1) {
  85                 if (!*timeo) {
  86                         rc = -EAGAIN;
  87                         break;
  88                 }
  89
  90                 if (signal_pending(current)) {
  91                         rc = sock_intr_errno(*timeo);
  92                         break;
  93                 }
  94
  95                 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
  96                         break;
  97         }
  98         remove_wait_queue(sk_sleep(sk), &wait);
  99         return rc;
 100 }
 101
 102 int tls_push_sg(struct sock *sk,
 103                 struct tls_context *ctx,
 104                 struct scatterlist *sg,
 105                 u16 first_offset,
 106                 int flags)
 107 {
 108         int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
 109         int ret = 0;
 110         struct page *p;
 111         size_t size;
 112         int offset = first_offset;
 113
 114         size = sg->length - offset;
 115         offset += sg->offset;
 116
 117         ctx->in_tcp_sendpages = true;
 118         while (1) {
 119                 if (sg_is_last(sg))
 120                         sendpage_flags = flags;
 121
 122                 /* is sending application-limited? */
 123                 tcp_rate_check_app_limited(sk);
 124                 p = sg_page(sg);
 125 retry:
 126                 ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);
 127
 128                 if (ret != size) {
 129                         if (ret > 0) {
 130                                 offset += ret;
 131                                 size -= ret;
 132                                 goto retry;
 133                         }
 134
 135                         offset -= sg->offset;
 136                         ctx->partially_sent_offset = offset;
 137                         ctx->partially_sent_record = (void *)sg;
 138                         ctx->in_tcp_sendpages = false;
 139                         return ret;
 140                 }
 141
 142                 put_page(p);
 143                 sk_mem_uncharge(sk, sg->length);
 144                 sg = sg_next(sg);
 145                 if (!sg)
 146                         break;
 147
 148                 offset = sg->offset;
 149                 size = sg->length;
 150         }
 151
 152         ctx->in_tcp_sendpages = false;
 153
 154         return 0;
 155 }
 156
 157 static int tls_handle_open_record(struct sock *sk, int flags)
 158 {
 159         struct tls_context *ctx = tls_get_ctx(sk);
 160
 161         if (tls_is_pending_open_record(ctx))
 162                 return ctx->push_pending_record(sk, flags);
 163
 164         return 0;
 165 }
 166
 167 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
 168                       unsigned char *record_type)
 169 {
 170         struct cmsghdr *cmsg;
 171         int rc = -EINVAL;
 172
 173         for_each_cmsghdr(cmsg, msg) {
 174                 if (!CMSG_OK(msg, cmsg))
 175                         return -EINVAL;
 176                 if (cmsg->cmsg_level != SOL_TLS)
 177                         continue;
 178
 179                 switch (cmsg->cmsg_type) {
 180                 case TLS_SET_RECORD_TYPE:
 181                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 182                                 return -EINVAL;
 183
 184                         if (msg->msg_flags & MSG_MORE)
 185                                 return -EINVAL;
 186
 187                         rc = tls_handle_open_record(sk, msg->msg_flags);
 188                         if (rc)
 189                                 return rc;
 190
 191                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 192                         rc = 0;
 193                         break;
 194                 default:
 195                         return -EINVAL;
 196                 }
 197         }
 198
 199         return rc;
 200 }
 201
 202 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 203                             int flags)
 204 {
 205         struct scatterlist *sg;
 206         u16 offset;
 207
 208         sg = ctx->partially_sent_record;
 209         offset = ctx->partially_sent_offset;
 210
 211         ctx->partially_sent_record = NULL;
 212         return tls_push_sg(sk, ctx, sg, offset, flags);
 213 }
 214
 215 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
 216 {
 217         struct scatterlist *sg;
 218
 219         for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
 220                 put_page(sg_page(sg));
 221                 sk_mem_uncharge(sk, sg->length);
 222         }
 223         ctx->partially_sent_record = NULL;
 224 }
 225
 226 static void tls_write_space(struct sock *sk)
 227 {
 228         struct tls_context *ctx = tls_get_ctx(sk);
 229
 230         /* If in_tcp_sendpages call lower protocol write space handler
 231          * to ensure we wake up any waiting operations there. For example
 232          * if do_tcp_sendpages where to call sk_wait_event.
 233          */
 234         if (ctx->in_tcp_sendpages) {
 235                 ctx->sk_write_space(sk);
 236                 return;
 237         }
 238
 239 #ifdef CONFIG_TLS_DEVICE
 240         if (ctx->tx_conf == TLS_HW)
 241                 tls_device_write_space(sk, ctx);
 242         else
 243 #endif
 244                 tls_sw_write_space(sk, ctx);
 245
 246         ctx->sk_write_space(sk);
 247 }
 248
 249 /**
 250  * tls_ctx_free() - free TLS ULP context
 251  * @sk:  socket to with @ctx is attached
 252  * @ctx: TLS context structure
 253  *
 254  * Free TLS context. If @sk is %NULL caller guarantees that the socket
 255  * to which @ctx was attached has no outstanding references.
 256  */
 257 void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
 258 {
 259         if (!ctx)
 260                 return;
 261
 262         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 263         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 264         mutex_destroy(&ctx->tx_lock);
 265
 266         if (sk)
 267                 kfree_rcu(ctx, rcu);
 268         else
 269                 kfree(ctx);
 270 }
 271
 272 static void tls_sk_proto_cleanup(struct sock *sk,
 273                                  struct tls_context *ctx, long timeo)
 274 {
 275         if (unlikely(sk->sk_write_pending) &&
 276             !wait_on_pending_writer(sk, &timeo))
 277                 tls_handle_open_record(sk, 0);
 278
 279         /* We need these for tls_sw_fallback handling of other packets */
 280         if (ctx->tx_conf == TLS_SW) {
 281                 kfree(ctx->tx.rec_seq);
 282                 kfree(ctx->tx.iv);
 283                 tls_sw_release_resources_tx(sk);
 284                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 285         } else if (ctx->tx_conf == TLS_HW) {
 286                 tls_device_free_resources_tx(sk);
 287                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 288         }
 289
 290         if (ctx->rx_conf == TLS_SW) {
 291                 tls_sw_release_resources_rx(sk);
 292                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 293         } else if (ctx->rx_conf == TLS_HW) {
 294                 tls_device_offload_cleanup_rx(sk);
 295                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 296         }
 297 }
 298
 299 static void tls_sk_proto_close(struct sock *sk, long timeout)
 300 {
 301         struct inet_connection_sock *icsk = inet_csk(sk);
 302         struct tls_context *ctx = tls_get_ctx(sk);
 303         long timeo = sock_sndtimeo(sk, 0);
 304         bool free_ctx;
 305
 306         if (ctx->tx_conf == TLS_SW)
 307                 tls_sw_cancel_work_tx(ctx);
 308
 309         lock_sock(sk);
 310         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 311
 312         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 313                 tls_sk_proto_cleanup(sk, ctx, timeo);
 314
 315         write_lock_bh(&sk->sk_callback_lock);
 316         if (free_ctx)
 317                 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 318         WRITE_ONCE(sk->sk_prot, ctx->sk_proto);
 319         if (sk->sk_write_space == tls_write_space)
 320                 sk->sk_write_space = ctx->sk_write_space;
 321         write_unlock_bh(&sk->sk_callback_lock);
 322         release_sock(sk);
 323         if (ctx->tx_conf == TLS_SW)
 324                 tls_sw_free_ctx_tx(ctx);
 325         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 326                 tls_sw_strparser_done(ctx);
 327         if (ctx->rx_conf == TLS_SW)
 328                 tls_sw_free_ctx_rx(ctx);
 329         ctx->sk_proto->close(sk, timeout);
 330
 331         if (free_ctx)
 332                 tls_ctx_free(sk, ctx);
 333 }
 334
 335 static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
 336                                   int __user *optlen, int tx)
 337 {
 338         int rc = 0;
 339         struct tls_context *ctx = tls_get_ctx(sk);
 340         struct tls_crypto_info *crypto_info;
 341         struct cipher_context *cctx;
 342         int len;
 343
 344         if (get_user(len, optlen))
 345                 return -EFAULT;
 346
 347         if (!optval || (len < sizeof(*crypto_info))) {
 348                 rc = -EINVAL;
 349                 goto out;
 350         }
 351
 352         if (!ctx) {
 353                 rc = -EBUSY;
 354                 goto out;
 355         }
 356
 357         /* get user crypto info */
 358         if (tx) {
 359                 crypto_info = &ctx->crypto_send.info;
 360                 cctx = &ctx->tx;
 361         } else {
 362                 crypto_info = &ctx->crypto_recv.info;
 363                 cctx = &ctx->rx;
 364         }
 365
 366         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 367                 rc = -EBUSY;
 368                 goto out;
 369         }
 370
 371         if (len == sizeof(*crypto_info)) {
 372                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 373                         rc = -EFAULT;
 374                 goto out;
 375         }
 376
 377         switch (crypto_info->cipher_type) {
 378         case TLS_CIPHER_AES_GCM_128: {
 379                 struct tls12_crypto_info_aes_gcm_128 *
 380                   crypto_info_aes_gcm_128 =
 381                   container_of(crypto_info,
 382                                struct tls12_crypto_info_aes_gcm_128,
 383                                info);
 384
 385                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 386                         rc = -EINVAL;
 387                         goto out;
 388                 }
 389                 lock_sock(sk);
 390                 memcpy(crypto_info_aes_gcm_128->iv,
 391                        cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 392                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 393                 memcpy(crypto_info_aes_gcm_128->rec_seq, cctx->rec_seq,
 394                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 395                 release_sock(sk);
 396                 if (copy_to_user(optval,
 397                                  crypto_info_aes_gcm_128,
 398                                  sizeof(*crypto_info_aes_gcm_128)))
 399                         rc = -EFAULT;
 400                 break;
 401         }
 402         case TLS_CIPHER_AES_GCM_256: {
 403                 struct tls12_crypto_info_aes_gcm_256 *
 404                   crypto_info_aes_gcm_256 =
 405                   container_of(crypto_info,
 406                                struct tls12_crypto_info_aes_gcm_256,
 407                                info);
 408
 409                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 410                         rc = -EINVAL;
 411                         goto out;
 412                 }
 413                 lock_sock(sk);
 414                 memcpy(crypto_info_aes_gcm_256->iv,
 415                        cctx->iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 416                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 417                 memcpy(crypto_info_aes_gcm_256->rec_seq, cctx->rec_seq,
 418                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 419                 release_sock(sk);
 420                 if (copy_to_user(optval,
 421                                  crypto_info_aes_gcm_256,
 422                                  sizeof(*crypto_info_aes_gcm_256)))
 423                         rc = -EFAULT;
 424                 break;
 425         }
 426         case TLS_CIPHER_AES_CCM_128: {
 427                 struct tls12_crypto_info_aes_ccm_128 *aes_ccm_128 =
 428                         container_of(crypto_info,
 429                                 struct tls12_crypto_info_aes_ccm_128, info);
 430
 431                 if (len != sizeof(*aes_ccm_128)) {
 432                         rc = -EINVAL;
 433                         goto out;
 434                 }
 435                 lock_sock(sk);
 436                 memcpy(aes_ccm_128->iv,
 437                        cctx->iv + TLS_CIPHER_AES_CCM_128_SALT_SIZE,
 438                        TLS_CIPHER_AES_CCM_128_IV_SIZE);
 439                 memcpy(aes_ccm_128->rec_seq, cctx->rec_seq,
 440                        TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE);
 441                 release_sock(sk);
 442                 if (copy_to_user(optval, aes_ccm_128, sizeof(*aes_ccm_128)))
 443                         rc = -EFAULT;
 444                 break;
 445         }
 446         case TLS_CIPHER_CHACHA20_POLY1305: {
 447                 struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305 =
 448                         container_of(crypto_info,
 449                                 struct tls12_crypto_info_chacha20_poly1305,
 450                                 info);
 451
 452                 if (len != sizeof(*chacha20_poly1305)) {
 453                         rc = -EINVAL;
 454                         goto out;
 455                 }
 456                 lock_sock(sk);
 457                 memcpy(chacha20_poly1305->iv,
 458                        cctx->iv + TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE,
 459                        TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);
 460                 memcpy(chacha20_poly1305->rec_seq, cctx->rec_seq,
 461                        TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE);
 462                 release_sock(sk);
 463                 if (copy_to_user(optval, chacha20_poly1305,
 464                                 sizeof(*chacha20_poly1305)))
 465                         rc = -EFAULT;
 466                 break;
 467         }
 468         case TLS_CIPHER_SM4_GCM: {
 469                 struct tls12_crypto_info_sm4_gcm *sm4_gcm_info =
 470                         container_of(crypto_info,
 471                                 struct tls12_crypto_info_sm4_gcm, info);
 472
 473                 if (len != sizeof(*sm4_gcm_info)) {
 474                         rc = -EINVAL;
 475                         goto out;
 476                 }
 477                 lock_sock(sk);
 478                 memcpy(sm4_gcm_info->iv,
 479                        cctx->iv + TLS_CIPHER_SM4_GCM_SALT_SIZE,
 480                        TLS_CIPHER_SM4_GCM_IV_SIZE);
 481                 memcpy(sm4_gcm_info->rec_seq, cctx->rec_seq,
 482                        TLS_CIPHER_SM4_GCM_REC_SEQ_SIZE);
 483                 release_sock(sk);
 484                 if (copy_to_user(optval, sm4_gcm_info, sizeof(*sm4_gcm_info)))
 485                         rc = -EFAULT;
 486                 break;
 487         }
 488         case TLS_CIPHER_SM4_CCM: {
 489                 struct tls12_crypto_info_sm4_ccm *sm4_ccm_info =
 490                         container_of(crypto_info,
 491                                 struct tls12_crypto_info_sm4_ccm, info);
 492
 493                 if (len != sizeof(*sm4_ccm_info)) {
 494                         rc = -EINVAL;
 495                         goto out;
 496                 }
 497                 lock_sock(sk);
 498                 memcpy(sm4_ccm_info->iv,
 499                        cctx->iv + TLS_CIPHER_SM4_CCM_SALT_SIZE,
 500                        TLS_CIPHER_SM4_CCM_IV_SIZE);
 501                 memcpy(sm4_ccm_info->rec_seq, cctx->rec_seq,
 502                        TLS_CIPHER_SM4_CCM_REC_SEQ_SIZE);
 503                 release_sock(sk);
 504                 if (copy_to_user(optval, sm4_ccm_info, sizeof(*sm4_ccm_info)))
 505                         rc = -EFAULT;
 506                 break;
 507         }
 508         default:
 509                 rc = -EINVAL;
 510         }
 511
 512 out:
 513         return rc;
 514 }
 515
 516 static int do_tls_getsockopt_tx_zc(struct sock *sk, char __user *optval,
 517                                    int __user *optlen)
 518 {
 519         struct tls_context *ctx = tls_get_ctx(sk);
 520         unsigned int value;
 521         int len;
 522
 523         if (get_user(len, optlen))
 524                 return -EFAULT;
 525
 526         if (len != sizeof(value))
 527                 return -EINVAL;
 528
 529         value = ctx->zerocopy_sendfile;
 530         if (copy_to_user(optval, &value, sizeof(value)))
 531                 return -EFAULT;
 532
 533         return 0;
 534 }
 535
 536 static int do_tls_getsockopt(struct sock *sk, int optname,
 537                              char __user *optval, int __user *optlen)
 538 {
 539         int rc = 0;
 540
 541         switch (optname) {
 542         case TLS_TX:
 543         case TLS_RX:
 544                 rc = do_tls_getsockopt_conf(sk, optval, optlen,
 545                                             optname == TLS_TX);
 546                 break;
 547         case TLS_TX_ZEROCOPY_SENDFILE:
 548                 rc = do_tls_getsockopt_tx_zc(sk, optval, optlen);
 549                 break;
 550         default:
 551                 rc = -ENOPROTOOPT;
 552                 break;
 553         }
 554         return rc;
 555 }
 556
 557 static int tls_getsockopt(struct sock *sk, int level, int optname,
 558                           char __user *optval, int __user *optlen)
 559 {
 560         struct tls_context *ctx = tls_get_ctx(sk);
 561
 562         if (level != SOL_TLS)
 563                 return ctx->sk_proto->getsockopt(sk, level,
 564                                                  optname, optval, optlen);
 565
 566         return do_tls_getsockopt(sk, optname, optval, optlen);
 567 }
 568
 569 static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
 570                                   unsigned int optlen, int tx)
 571 {
 572         struct tls_crypto_info *crypto_info;
 573         struct tls_crypto_info *alt_crypto_info;
 574         struct tls_context *ctx = tls_get_ctx(sk);
 575         size_t optsize;
 576         int rc = 0;
 577         int conf;
 578
 579         if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info)))
 580                 return -EINVAL;
 581
 582         if (tx) {
 583                 crypto_info = &ctx->crypto_send.info;
 584                 alt_crypto_info = &ctx->crypto_recv.info;
 585         } else {
 586                 crypto_info = &ctx->crypto_recv.info;
 587                 alt_crypto_info = &ctx->crypto_send.info;
 588         }
 589
 590         /* Currently we don't support set crypto info more than one time */
 591         if (TLS_CRYPTO_INFO_READY(crypto_info))
 592                 return -EBUSY;
 593
 594         rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
 595         if (rc) {
 596                 rc = -EFAULT;
 597                 goto err_crypto_info;
 598         }
 599
 600         /* check version */
 601         if (crypto_info->version != TLS_1_2_VERSION &&
 602             crypto_info->version != TLS_1_3_VERSION) {
 603                 rc = -EINVAL;
 604                 goto err_crypto_info;
 605         }
 606
 607         /* Ensure that TLS version and ciphers are same in both directions */
 608         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 609                 if (alt_crypto_info->version != crypto_info->version ||
 610                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 611                         rc = -EINVAL;
 612                         goto err_crypto_info;
 613                 }
 614         }
 615
 616         switch (crypto_info->cipher_type) {
 617         case TLS_CIPHER_AES_GCM_128:
 618                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 619                 break;
 620         case TLS_CIPHER_AES_GCM_256: {
 621                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 622                 break;
 623         }
 624         case TLS_CIPHER_AES_CCM_128:
 625                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 626                 break;
 627         case TLS_CIPHER_CHACHA20_POLY1305:
 628                 optsize = sizeof(struct tls12_crypto_info_chacha20_poly1305);
 629                 break;
 630         case TLS_CIPHER_SM4_GCM:
 631                 optsize = sizeof(struct tls12_crypto_info_sm4_gcm);
 632                 break;
 633         case TLS_CIPHER_SM4_CCM:
 634                 optsize = sizeof(struct tls12_crypto_info_sm4_ccm);
 635                 break;
 636         default:
 637                 rc = -EINVAL;
 638                 goto err_crypto_info;
 639         }
 640
 641         if (optlen != optsize) {
 642                 rc = -EINVAL;
 643                 goto err_crypto_info;
 644         }
 645
 646         rc = copy_from_sockptr_offset(crypto_info + 1, optval,
 647                                       sizeof(*crypto_info),
 648                                       optlen - sizeof(*crypto_info));
 649         if (rc) {
 650                 rc = -EFAULT;
 651                 goto err_crypto_info;
 652         }
 653
 654         if (tx) {
 655                 rc = tls_set_device_offload(sk, ctx);
 656                 conf = TLS_HW;
 657                 if (!rc) {
 658                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
 659                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 660                 } else {
 661                         rc = tls_set_sw_offload(sk, ctx, 1);
 662                         if (rc)
 663                                 goto err_crypto_info;
 664                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
 665                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 666                         conf = TLS_SW;
 667                 }
 668         } else {
 669                 rc = tls_set_device_offload_rx(sk, ctx);
 670                 conf = TLS_HW;
 671                 if (!rc) {
 672                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
 673                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 674                 } else {
 675                         rc = tls_set_sw_offload(sk, ctx, 0);
 676                         if (rc)
 677                                 goto err_crypto_info;
 678                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
 679                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 680                         conf = TLS_SW;
 681                 }
 682                 tls_sw_strparser_arm(sk, ctx);
 683         }
 684
 685         if (tx)
 686                 ctx->tx_conf = conf;
 687         else
 688                 ctx->rx_conf = conf;
 689         update_sk_prot(sk, ctx);
 690         if (tx) {
 691                 ctx->sk_write_space = sk->sk_write_space;
 692                 sk->sk_write_space = tls_write_space;
 693         }
 694         return 0;
 695
 696 err_crypto_info:
 697         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 698         return rc;
 699 }
 700
 701 static int do_tls_setsockopt_tx_zc(struct sock *sk, sockptr_t optval,
 702                                    unsigned int optlen)
 703 {
 704         struct tls_context *ctx = tls_get_ctx(sk);
 705         unsigned int value;
 706
 707         if (sockptr_is_null(optval) || optlen != sizeof(value))
 708                 return -EINVAL;
 709
 710         if (copy_from_sockptr(&value, optval, sizeof(value)))
 711                 return -EFAULT;
 712
 713         if (value > 1)
 714                 return -EINVAL;
 715
 716         ctx->zerocopy_sendfile = value;
 717
 718         return 0;
 719 }
 720
 721 static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
 722                              unsigned int optlen)
 723 {
 724         int rc = 0;
 725
 726         switch (optname) {
 727         case TLS_TX:
 728         case TLS_RX:
 729                 lock_sock(sk);
 730                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 731                                             optname == TLS_TX);
 732                 release_sock(sk);
 733                 break;
 734         case TLS_TX_ZEROCOPY_SENDFILE:
 735                 lock_sock(sk);
 736                 rc = do_tls_setsockopt_tx_zc(sk, optval, optlen);
 737                 release_sock(sk);
 738                 break;
 739         default:
 740                 rc = -ENOPROTOOPT;
 741                 break;
 742         }
 743         return rc;
 744 }
 745
 746 static int tls_setsockopt(struct sock *sk, int level, int optname,
 747                           sockptr_t optval, unsigned int optlen)
 748 {
 749         struct tls_context *ctx = tls_get_ctx(sk);
 750
 751         if (level != SOL_TLS)
 752                 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
 753                                                  optlen);
 754
 755         return do_tls_setsockopt(sk, optname, optval, optlen);
 756 }
 757
 758 struct tls_context *tls_ctx_create(struct sock *sk)
 759 {
 760         struct inet_connection_sock *icsk = inet_csk(sk);
 761         struct tls_context *ctx;
 762
 763         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 764         if (!ctx)
 765                 return NULL;
 766
 767         mutex_init(&ctx->tx_lock);
 768         rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 769         ctx->sk_proto = READ_ONCE(sk->sk_prot);
 770         ctx->sk = sk;
 771         return ctx;
 772 }
 773
 774 static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 775                             const struct proto_ops *base)
 776 {
 777         ops[TLS_BASE][TLS_BASE] = *base;
 778
 779         ops[TLS_SW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 780         ops[TLS_SW  ][TLS_BASE].sendpage_locked = tls_sw_sendpage_locked;
 781
 782         ops[TLS_BASE][TLS_SW  ] = ops[TLS_BASE][TLS_BASE];
 783         ops[TLS_BASE][TLS_SW  ].splice_read     = tls_sw_splice_read;
 784
 785         ops[TLS_SW  ][TLS_SW  ] = ops[TLS_SW  ][TLS_BASE];
 786         ops[TLS_SW  ][TLS_SW  ].splice_read     = tls_sw_splice_read;
 787
 788 #ifdef CONFIG_TLS_DEVICE
 789         ops[TLS_HW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 790         ops[TLS_HW  ][TLS_BASE].sendpage_locked = NULL;
 791
 792         ops[TLS_HW  ][TLS_SW  ] = ops[TLS_BASE][TLS_SW  ];
 793         ops[TLS_HW  ][TLS_SW  ].sendpage_locked = NULL;
 794
 795         ops[TLS_BASE][TLS_HW  ] = ops[TLS_BASE][TLS_SW  ];
 796
 797         ops[TLS_SW  ][TLS_HW  ] = ops[TLS_SW  ][TLS_SW  ];
 798
 799         ops[TLS_HW  ][TLS_HW  ] = ops[TLS_HW  ][TLS_SW  ];
 800         ops[TLS_HW  ][TLS_HW  ].sendpage_locked = NULL;
 801 #endif
 802 #ifdef CONFIG_TLS_TOE
 803         ops[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 804 #endif
 805 }
 806
 807 static void tls_build_proto(struct sock *sk)
 808 {
 809         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 810         struct proto *prot = READ_ONCE(sk->sk_prot);
 811
 812         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 813         if (ip_ver == TLSV6 &&
 814             unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
 815                 mutex_lock(&tcpv6_prot_mutex);
 816                 if (likely(prot != saved_tcpv6_prot)) {
 817                         build_protos(tls_prots[TLSV6], prot);
 818                         build_proto_ops(tls_proto_ops[TLSV6],
 819                                         sk->sk_socket->ops);
 820                         smp_store_release(&saved_tcpv6_prot, prot);
 821                 }
 822                 mutex_unlock(&tcpv6_prot_mutex);
 823         }
 824
 825         if (ip_ver == TLSV4 &&
 826             unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
 827                 mutex_lock(&tcpv4_prot_mutex);
 828                 if (likely(prot != saved_tcpv4_prot)) {
 829                         build_protos(tls_prots[TLSV4], prot);
 830                         build_proto_ops(tls_proto_ops[TLSV4],
 831                                         sk->sk_socket->ops);
 832                         smp_store_release(&saved_tcpv4_prot, prot);
 833                 }
 834                 mutex_unlock(&tcpv4_prot_mutex);
 835         }
 836 }
 837
 838 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 839                          const struct proto *base)
 840 {
 841         prot[TLS_BASE][TLS_BASE] = *base;
 842         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 843         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 844         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 845
 846         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 847         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 848         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 849
 850         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 851         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 852         prot[TLS_BASE][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
 853         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 854
 855         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 856         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 857         prot[TLS_SW][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
 858         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 859
 860 #ifdef CONFIG_TLS_DEVICE
 861         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 862         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 863         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 864
 865         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 866         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 867         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 868
 869         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 870
 871         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 872
 873         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 874 #endif
 875 #ifdef CONFIG_TLS_TOE
 876         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 877         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_toe_hash;
 878         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_toe_unhash;
 879 #endif
 880 }
 881
 882 static int tls_init(struct sock *sk)
 883 {
 884         struct tls_context *ctx;
 885         int rc = 0;
 886
 887         tls_build_proto(sk);
 888
 889 #ifdef CONFIG_TLS_TOE
 890         if (tls_toe_bypass(sk))
 891                 return 0;
 892 #endif
 893
 894         /* The TLS ulp is currently supported only for TCP sockets
 895          * in ESTABLISHED state.
 896          * Supporting sockets in LISTEN state will require us
 897          * to modify the accept implementation to clone rather then
 898          * share the ulp context.
 899          */
 900         if (sk->sk_state != TCP_ESTABLISHED)
 901                 return -ENOTCONN;
 902
 903         /* allocate tls context */
 904         write_lock_bh(&sk->sk_callback_lock);
 905         ctx = tls_ctx_create(sk);
 906         if (!ctx) {
 907                 rc = -ENOMEM;
 908                 goto out;
 909         }
 910
 911         ctx->tx_conf = TLS_BASE;
 912         ctx->rx_conf = TLS_BASE;
 913         update_sk_prot(sk, ctx);
 914 out:
 915         write_unlock_bh(&sk->sk_callback_lock);
 916         return rc;
 917 }
 918
 919 static void tls_update(struct sock *sk, struct proto *p,
 920                        void (*write_space)(struct sock *sk))
 921 {
 922         struct tls_context *ctx;
 923
 924         ctx = tls_get_ctx(sk);
 925         if (likely(ctx)) {
 926                 ctx->sk_write_space = write_space;
 927                 ctx->sk_proto = p;
 928         } else {
 929                 /* Pairs with lockless read in sk_clone_lock(). */
 930                 WRITE_ONCE(sk->sk_prot, p);
 931                 sk->sk_write_space = write_space;
 932         }
 933 }
 934
 935 static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
 936 {
 937         u16 version, cipher_type;
 938         struct tls_context *ctx;
 939         struct nlattr *start;
 940         int err;
 941
 942         start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
 943         if (!start)
 944                 return -EMSGSIZE;
 945
 946         rcu_read_lock();
 947         ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
 948         if (!ctx) {
 949                 err = 0;
 950                 goto nla_failure;
 951         }
 952         version = ctx->prot_info.version;
 953         if (version) {
 954                 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
 955                 if (err)
 956                         goto nla_failure;
 957         }
 958         cipher_type = ctx->prot_info.cipher_type;
 959         if (cipher_type) {
 960                 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
 961                 if (err)
 962                         goto nla_failure;
 963         }
 964         err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
 965         if (err)
 966                 goto nla_failure;
 967
 968         err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
 969         if (err)
 970                 goto nla_failure;
 971
 972         if (ctx->tx_conf == TLS_HW && ctx->zerocopy_sendfile) {
 973                 err = nla_put_flag(skb, TLS_INFO_ZC_SENDFILE);
 974                 if (err)
 975                         goto nla_failure;
 976         }
 977
 978         rcu_read_unlock();
 979         nla_nest_end(skb, start);
 980         return 0;
 981
 982 nla_failure:
 983         rcu_read_unlock();
 984         nla_nest_cancel(skb, start);
 985         return err;
 986 }
 987
 988 static size_t tls_get_info_size(const struct sock *sk)
 989 {
 990         size_t size = 0;
 991
 992         size += nla_total_size(0) +             /* INET_ULP_INFO_TLS */
 993                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_VERSION */
 994                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_CIPHER */
 995                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_RXCONF */
 996                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_TXCONF */
 997                 nla_total_size(0) +             /* TLS_INFO_ZC_SENDFILE */
 998                 0;
 999
1000         return size;
1001 }
1002
1003 static int __net_init tls_init_net(struct net *net)
1004 {
1005         int err;
1006
1007         net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
1008         if (!net->mib.tls_statistics)
1009                 return -ENOMEM;
1010
1011         err = tls_proc_init(net);
1012         if (err)
1013                 goto err_free_stats;
1014
1015         return 0;
1016 err_free_stats:
1017         free_percpu(net->mib.tls_statistics);
1018         return err;
1019 }
1020
1021 static void __net_exit tls_exit_net(struct net *net)
1022 {
1023         tls_proc_fini(net);
1024         free_percpu(net->mib.tls_statistics);
1025 }
1026
1027 static struct pernet_operations tls_proc_ops = {
1028         .init = tls_init_net,
1029         .exit = tls_exit_net,
1030 };
1031
1032 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
1033         .name                   = "tls",
1034         .owner                  = THIS_MODULE,
1035         .init                   = tls_init,
1036         .update                 = tls_update,
1037         .get_info               = tls_get_info,
1038         .get_info_size          = tls_get_info_size,
1039 };
1040
1041 static int __init tls_register(void)
1042 {
1043         int err;
1044
1045         err = register_pernet_subsys(&tls_proc_ops);
1046         if (err)
1047                 return err;
1048
1049         tls_device_init();
1050         tcp_register_ulp(&tcp_tls_ulp_ops);
1051
1052         return 0;
1053 }
1054
1055 static void __exit tls_unregister(void)
1056 {
1057         tcp_unregister_ulp(&tcp_tls_ulp_ops);
1058         tls_device_cleanup();
1059         unregister_pernet_subsys(&tls_proc_ops);
1060 }
1061
1062 module_init(tls_register);
1063 module_exit(tls_unregister);