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 static const struct proto *saved_tcpv6_prot;
  62 static DEFINE_MUTEX(tcpv6_prot_mutex);
  63 static const struct proto *saved_tcpv4_prot;
  64 static DEFINE_MUTEX(tcpv4_prot_mutex);
  65 static struct proto tls_prots[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  66 static struct proto_ops tls_proto_ops[TLS_NUM_PROTS][TLS_NUM_CONFIG][TLS_NUM_CONFIG];
  67 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
  68                          const struct proto *base);
  69
  70 void update_sk_prot(struct sock *sk, struct tls_context *ctx)
  71 {
  72         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
  73
  74         WRITE_ONCE(sk->sk_prot,
  75                    &tls_prots[ip_ver][ctx->tx_conf][ctx->rx_conf]);
  76         WRITE_ONCE(sk->sk_socket->ops,
  77                    &tls_proto_ops[ip_ver][ctx->tx_conf][ctx->rx_conf]);
  78 }
  79
  80 int wait_on_pending_writer(struct sock *sk, long *timeo)
  81 {
  82         int rc = 0;
  83         DEFINE_WAIT_FUNC(wait, woken_wake_function);
  84
  85         add_wait_queue(sk_sleep(sk), &wait);
  86         while (1) {
  87                 if (!*timeo) {
  88                         rc = -EAGAIN;
  89                         break;
  90                 }
  91
  92                 if (signal_pending(current)) {
  93                         rc = sock_intr_errno(*timeo);
  94                         break;
  95                 }
  96
  97                 if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
  98                         break;
  99         }
 100         remove_wait_queue(sk_sleep(sk), &wait);
 101         return rc;
 102 }
 103
 104 int tls_push_sg(struct sock *sk,
 105                 struct tls_context *ctx,
 106                 struct scatterlist *sg,
 107                 u16 first_offset,
 108                 int flags)
 109 {
 110         int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
 111         int ret = 0;
 112         struct page *p;
 113         size_t size;
 114         int offset = first_offset;
 115
 116         size = sg->length - offset;
 117         offset += sg->offset;
 118
 119         ctx->in_tcp_sendpages = true;
 120         while (1) {
 121                 if (sg_is_last(sg))
 122                         sendpage_flags = flags;
 123
 124                 /* is sending application-limited? */
 125                 tcp_rate_check_app_limited(sk);
 126                 p = sg_page(sg);
 127 retry:
 128                 ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);
 129
 130                 if (ret != size) {
 131                         if (ret > 0) {
 132                                 offset += ret;
 133                                 size -= ret;
 134                                 goto retry;
 135                         }
 136
 137                         offset -= sg->offset;
 138                         ctx->partially_sent_offset = offset;
 139                         ctx->partially_sent_record = (void *)sg;
 140                         ctx->in_tcp_sendpages = false;
 141                         return ret;
 142                 }
 143
 144                 put_page(p);
 145                 sk_mem_uncharge(sk, sg->length);
 146                 sg = sg_next(sg);
 147                 if (!sg)
 148                         break;
 149
 150                 offset = sg->offset;
 151                 size = sg->length;
 152         }
 153
 154         ctx->in_tcp_sendpages = false;
 155
 156         return 0;
 157 }
 158
 159 static int tls_handle_open_record(struct sock *sk, int flags)
 160 {
 161         struct tls_context *ctx = tls_get_ctx(sk);
 162
 163         if (tls_is_pending_open_record(ctx))
 164                 return ctx->push_pending_record(sk, flags);
 165
 166         return 0;
 167 }
 168
 169 int tls_process_cmsg(struct sock *sk, struct msghdr *msg,
 170                      unsigned char *record_type)
 171 {
 172         struct cmsghdr *cmsg;
 173         int rc = -EINVAL;
 174
 175         for_each_cmsghdr(cmsg, msg) {
 176                 if (!CMSG_OK(msg, cmsg))
 177                         return -EINVAL;
 178                 if (cmsg->cmsg_level != SOL_TLS)
 179                         continue;
 180
 181                 switch (cmsg->cmsg_type) {
 182                 case TLS_SET_RECORD_TYPE:
 183                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 184                                 return -EINVAL;
 185
 186                         if (msg->msg_flags & MSG_MORE)
 187                                 return -EINVAL;
 188
 189                         rc = tls_handle_open_record(sk, msg->msg_flags);
 190                         if (rc)
 191                                 return rc;
 192
 193                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
 194                         rc = 0;
 195                         break;
 196                 default:
 197                         return -EINVAL;
 198                 }
 199         }
 200
 201         return rc;
 202 }
 203
 204 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 205                             int flags)
 206 {
 207         struct scatterlist *sg;
 208         u16 offset;
 209
 210         sg = ctx->partially_sent_record;
 211         offset = ctx->partially_sent_offset;
 212
 213         ctx->partially_sent_record = NULL;
 214         return tls_push_sg(sk, ctx, sg, offset, flags);
 215 }
 216
 217 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
 218 {
 219         struct scatterlist *sg;
 220
 221         for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
 222                 put_page(sg_page(sg));
 223                 sk_mem_uncharge(sk, sg->length);
 224         }
 225         ctx->partially_sent_record = NULL;
 226 }
 227
 228 static void tls_write_space(struct sock *sk)
 229 {
 230         struct tls_context *ctx = tls_get_ctx(sk);
 231
 232         /* If in_tcp_sendpages call lower protocol write space handler
 233          * to ensure we wake up any waiting operations there. For example
 234          * if do_tcp_sendpages where to call sk_wait_event.
 235          */
 236         if (ctx->in_tcp_sendpages) {
 237                 ctx->sk_write_space(sk);
 238                 return;
 239         }
 240
 241 #ifdef CONFIG_TLS_DEVICE
 242         if (ctx->tx_conf == TLS_HW)
 243                 tls_device_write_space(sk, ctx);
 244         else
 245 #endif
 246                 tls_sw_write_space(sk, ctx);
 247
 248         ctx->sk_write_space(sk);
 249 }
 250
 251 /**
 252  * tls_ctx_free() - free TLS ULP context
 253  * @sk:  socket to with @ctx is attached
 254  * @ctx: TLS context structure
 255  *
 256  * Free TLS context. If @sk is %NULL caller guarantees that the socket
 257  * to which @ctx was attached has no outstanding references.
 258  */
 259 void tls_ctx_free(struct sock *sk, struct tls_context *ctx)
 260 {
 261         if (!ctx)
 262                 return;
 263
 264         memzero_explicit(&ctx->crypto_send, sizeof(ctx->crypto_send));
 265         memzero_explicit(&ctx->crypto_recv, sizeof(ctx->crypto_recv));
 266         mutex_destroy(&ctx->tx_lock);
 267
 268         if (sk)
 269                 kfree_rcu(ctx, rcu);
 270         else
 271                 kfree(ctx);
 272 }
 273
 274 static void tls_sk_proto_cleanup(struct sock *sk,
 275                                  struct tls_context *ctx, long timeo)
 276 {
 277         if (unlikely(sk->sk_write_pending) &&
 278             !wait_on_pending_writer(sk, &timeo))
 279                 tls_handle_open_record(sk, 0);
 280
 281         /* We need these for tls_sw_fallback handling of other packets */
 282         if (ctx->tx_conf == TLS_SW) {
 283                 kfree(ctx->tx.rec_seq);
 284                 kfree(ctx->tx.iv);
 285                 tls_sw_release_resources_tx(sk);
 286                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 287         } else if (ctx->tx_conf == TLS_HW) {
 288                 tls_device_free_resources_tx(sk);
 289                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 290         }
 291
 292         if (ctx->rx_conf == TLS_SW) {
 293                 tls_sw_release_resources_rx(sk);
 294                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 295         } else if (ctx->rx_conf == TLS_HW) {
 296                 tls_device_offload_cleanup_rx(sk);
 297                 TLS_DEC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 298         }
 299 }
 300
 301 static void tls_sk_proto_close(struct sock *sk, long timeout)
 302 {
 303         struct inet_connection_sock *icsk = inet_csk(sk);
 304         struct tls_context *ctx = tls_get_ctx(sk);
 305         long timeo = sock_sndtimeo(sk, 0);
 306         bool free_ctx;
 307
 308         if (ctx->tx_conf == TLS_SW)
 309                 tls_sw_cancel_work_tx(ctx);
 310
 311         lock_sock(sk);
 312         free_ctx = ctx->tx_conf != TLS_HW && ctx->rx_conf != TLS_HW;
 313
 314         if (ctx->tx_conf != TLS_BASE || ctx->rx_conf != TLS_BASE)
 315                 tls_sk_proto_cleanup(sk, ctx, timeo);
 316
 317         write_lock_bh(&sk->sk_callback_lock);
 318         if (free_ctx)
 319                 rcu_assign_pointer(icsk->icsk_ulp_data, NULL);
 320         WRITE_ONCE(sk->sk_prot, ctx->sk_proto);
 321         if (sk->sk_write_space == tls_write_space)
 322                 sk->sk_write_space = ctx->sk_write_space;
 323         write_unlock_bh(&sk->sk_callback_lock);
 324         release_sock(sk);
 325         if (ctx->tx_conf == TLS_SW)
 326                 tls_sw_free_ctx_tx(ctx);
 327         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 328                 tls_sw_strparser_done(ctx);
 329         if (ctx->rx_conf == TLS_SW)
 330                 tls_sw_free_ctx_rx(ctx);
 331         ctx->sk_proto->close(sk, timeout);
 332
 333         if (free_ctx)
 334                 tls_ctx_free(sk, ctx);
 335 }
 336
 337 static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
 338                                   int __user *optlen, int tx)
 339 {
 340         int rc = 0;
 341         struct tls_context *ctx = tls_get_ctx(sk);
 342         struct tls_crypto_info *crypto_info;
 343         struct cipher_context *cctx;
 344         int len;
 345
 346         if (get_user(len, optlen))
 347                 return -EFAULT;
 348
 349         if (!optval || (len < sizeof(*crypto_info))) {
 350                 rc = -EINVAL;
 351                 goto out;
 352         }
 353
 354         if (!ctx) {
 355                 rc = -EBUSY;
 356                 goto out;
 357         }
 358
 359         /* get user crypto info */
 360         if (tx) {
 361                 crypto_info = &ctx->crypto_send.info;
 362                 cctx = &ctx->tx;
 363         } else {
 364                 crypto_info = &ctx->crypto_recv.info;
 365                 cctx = &ctx->rx;
 366         }
 367
 368         if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 369                 rc = -EBUSY;
 370                 goto out;
 371         }
 372
 373         if (len == sizeof(*crypto_info)) {
 374                 if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
 375                         rc = -EFAULT;
 376                 goto out;
 377         }
 378
 379         switch (crypto_info->cipher_type) {
 380         case TLS_CIPHER_AES_GCM_128: {
 381                 struct tls12_crypto_info_aes_gcm_128 *
 382                   crypto_info_aes_gcm_128 =
 383                   container_of(crypto_info,
 384                                struct tls12_crypto_info_aes_gcm_128,
 385                                info);
 386
 387                 if (len != sizeof(*crypto_info_aes_gcm_128)) {
 388                         rc = -EINVAL;
 389                         goto out;
 390                 }
 391                 lock_sock(sk);
 392                 memcpy(crypto_info_aes_gcm_128->iv,
 393                        cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 394                        TLS_CIPHER_AES_GCM_128_IV_SIZE);
 395                 memcpy(crypto_info_aes_gcm_128->rec_seq, cctx->rec_seq,
 396                        TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 397                 release_sock(sk);
 398                 if (copy_to_user(optval,
 399                                  crypto_info_aes_gcm_128,
 400                                  sizeof(*crypto_info_aes_gcm_128)))
 401                         rc = -EFAULT;
 402                 break;
 403         }
 404         case TLS_CIPHER_AES_GCM_256: {
 405                 struct tls12_crypto_info_aes_gcm_256 *
 406                   crypto_info_aes_gcm_256 =
 407                   container_of(crypto_info,
 408                                struct tls12_crypto_info_aes_gcm_256,
 409                                info);
 410
 411                 if (len != sizeof(*crypto_info_aes_gcm_256)) {
 412                         rc = -EINVAL;
 413                         goto out;
 414                 }
 415                 lock_sock(sk);
 416                 memcpy(crypto_info_aes_gcm_256->iv,
 417                        cctx->iv + TLS_CIPHER_AES_GCM_256_SALT_SIZE,
 418                        TLS_CIPHER_AES_GCM_256_IV_SIZE);
 419                 memcpy(crypto_info_aes_gcm_256->rec_seq, cctx->rec_seq,
 420                        TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE);
 421                 release_sock(sk);
 422                 if (copy_to_user(optval,
 423                                  crypto_info_aes_gcm_256,
 424                                  sizeof(*crypto_info_aes_gcm_256)))
 425                         rc = -EFAULT;
 426                 break;
 427         }
 428         case TLS_CIPHER_AES_CCM_128: {
 429                 struct tls12_crypto_info_aes_ccm_128 *aes_ccm_128 =
 430                         container_of(crypto_info,
 431                                 struct tls12_crypto_info_aes_ccm_128, info);
 432
 433                 if (len != sizeof(*aes_ccm_128)) {
 434                         rc = -EINVAL;
 435                         goto out;
 436                 }
 437                 lock_sock(sk);
 438                 memcpy(aes_ccm_128->iv,
 439                        cctx->iv + TLS_CIPHER_AES_CCM_128_SALT_SIZE,
 440                        TLS_CIPHER_AES_CCM_128_IV_SIZE);
 441                 memcpy(aes_ccm_128->rec_seq, cctx->rec_seq,
 442                        TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE);
 443                 release_sock(sk);
 444                 if (copy_to_user(optval, aes_ccm_128, sizeof(*aes_ccm_128)))
 445                         rc = -EFAULT;
 446                 break;
 447         }
 448         case TLS_CIPHER_CHACHA20_POLY1305: {
 449                 struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305 =
 450                         container_of(crypto_info,
 451                                 struct tls12_crypto_info_chacha20_poly1305,
 452                                 info);
 453
 454                 if (len != sizeof(*chacha20_poly1305)) {
 455                         rc = -EINVAL;
 456                         goto out;
 457                 }
 458                 lock_sock(sk);
 459                 memcpy(chacha20_poly1305->iv,
 460                        cctx->iv + TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE,
 461                        TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE);
 462                 memcpy(chacha20_poly1305->rec_seq, cctx->rec_seq,
 463                        TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE);
 464                 release_sock(sk);
 465                 if (copy_to_user(optval, chacha20_poly1305,
 466                                 sizeof(*chacha20_poly1305)))
 467                         rc = -EFAULT;
 468                 break;
 469         }
 470         case TLS_CIPHER_SM4_GCM: {
 471                 struct tls12_crypto_info_sm4_gcm *sm4_gcm_info =
 472                         container_of(crypto_info,
 473                                 struct tls12_crypto_info_sm4_gcm, info);
 474
 475                 if (len != sizeof(*sm4_gcm_info)) {
 476                         rc = -EINVAL;
 477                         goto out;
 478                 }
 479                 lock_sock(sk);
 480                 memcpy(sm4_gcm_info->iv,
 481                        cctx->iv + TLS_CIPHER_SM4_GCM_SALT_SIZE,
 482                        TLS_CIPHER_SM4_GCM_IV_SIZE);
 483                 memcpy(sm4_gcm_info->rec_seq, cctx->rec_seq,
 484                        TLS_CIPHER_SM4_GCM_REC_SEQ_SIZE);
 485                 release_sock(sk);
 486                 if (copy_to_user(optval, sm4_gcm_info, sizeof(*sm4_gcm_info)))
 487                         rc = -EFAULT;
 488                 break;
 489         }
 490         case TLS_CIPHER_SM4_CCM: {
 491                 struct tls12_crypto_info_sm4_ccm *sm4_ccm_info =
 492                         container_of(crypto_info,
 493                                 struct tls12_crypto_info_sm4_ccm, info);
 494
 495                 if (len != sizeof(*sm4_ccm_info)) {
 496                         rc = -EINVAL;
 497                         goto out;
 498                 }
 499                 lock_sock(sk);
 500                 memcpy(sm4_ccm_info->iv,
 501                        cctx->iv + TLS_CIPHER_SM4_CCM_SALT_SIZE,
 502                        TLS_CIPHER_SM4_CCM_IV_SIZE);
 503                 memcpy(sm4_ccm_info->rec_seq, cctx->rec_seq,
 504                        TLS_CIPHER_SM4_CCM_REC_SEQ_SIZE);
 505                 release_sock(sk);
 506                 if (copy_to_user(optval, sm4_ccm_info, sizeof(*sm4_ccm_info)))
 507                         rc = -EFAULT;
 508                 break;
 509         }
 510         default:
 511                 rc = -EINVAL;
 512         }
 513
 514 out:
 515         return rc;
 516 }
 517
 518 static int do_tls_getsockopt_tx_zc(struct sock *sk, char __user *optval,
 519                                    int __user *optlen)
 520 {
 521         struct tls_context *ctx = tls_get_ctx(sk);
 522         unsigned int value;
 523         int len;
 524
 525         if (get_user(len, optlen))
 526                 return -EFAULT;
 527
 528         if (len != sizeof(value))
 529                 return -EINVAL;
 530
 531         value = ctx->zerocopy_sendfile;
 532         if (copy_to_user(optval, &value, sizeof(value)))
 533                 return -EFAULT;
 534
 535         return 0;
 536 }
 537
 538 static int do_tls_getsockopt_no_pad(struct sock *sk, char __user *optval,
 539                                     int __user *optlen)
 540 {
 541         struct tls_context *ctx = tls_get_ctx(sk);
 542         int value, len;
 543
 544         if (ctx->prot_info.version != TLS_1_3_VERSION)
 545                 return -EINVAL;
 546
 547         if (get_user(len, optlen))
 548                 return -EFAULT;
 549         if (len < sizeof(value))
 550                 return -EINVAL;
 551
 552         lock_sock(sk);
 553         value = -EINVAL;
 554         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW)
 555                 value = ctx->rx_no_pad;
 556         release_sock(sk);
 557         if (value < 0)
 558                 return value;
 559
 560         if (put_user(sizeof(value), optlen))
 561                 return -EFAULT;
 562         if (copy_to_user(optval, &value, sizeof(value)))
 563                 return -EFAULT;
 564
 565         return 0;
 566 }
 567
 568 static int do_tls_getsockopt(struct sock *sk, int optname,
 569                              char __user *optval, int __user *optlen)
 570 {
 571         int rc = 0;
 572
 573         switch (optname) {
 574         case TLS_TX:
 575         case TLS_RX:
 576                 rc = do_tls_getsockopt_conf(sk, optval, optlen,
 577                                             optname == TLS_TX);
 578                 break;
 579         case TLS_TX_ZEROCOPY_RO:
 580                 rc = do_tls_getsockopt_tx_zc(sk, optval, optlen);
 581                 break;
 582         case TLS_RX_EXPECT_NO_PAD:
 583                 rc = do_tls_getsockopt_no_pad(sk, optval, optlen);
 584                 break;
 585         default:
 586                 rc = -ENOPROTOOPT;
 587                 break;
 588         }
 589         return rc;
 590 }
 591
 592 static int tls_getsockopt(struct sock *sk, int level, int optname,
 593                           char __user *optval, int __user *optlen)
 594 {
 595         struct tls_context *ctx = tls_get_ctx(sk);
 596
 597         if (level != SOL_TLS)
 598                 return ctx->sk_proto->getsockopt(sk, level,
 599                                                  optname, optval, optlen);
 600
 601         return do_tls_getsockopt(sk, optname, optval, optlen);
 602 }
 603
 604 static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
 605                                   unsigned int optlen, int tx)
 606 {
 607         struct tls_crypto_info *crypto_info;
 608         struct tls_crypto_info *alt_crypto_info;
 609         struct tls_context *ctx = tls_get_ctx(sk);
 610         size_t optsize;
 611         int rc = 0;
 612         int conf;
 613
 614         if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info)))
 615                 return -EINVAL;
 616
 617         if (tx) {
 618                 crypto_info = &ctx->crypto_send.info;
 619                 alt_crypto_info = &ctx->crypto_recv.info;
 620         } else {
 621                 crypto_info = &ctx->crypto_recv.info;
 622                 alt_crypto_info = &ctx->crypto_send.info;
 623         }
 624
 625         /* Currently we don't support set crypto info more than one time */
 626         if (TLS_CRYPTO_INFO_READY(crypto_info))
 627                 return -EBUSY;
 628
 629         rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
 630         if (rc) {
 631                 rc = -EFAULT;
 632                 goto err_crypto_info;
 633         }
 634
 635         /* check version */
 636         if (crypto_info->version != TLS_1_2_VERSION &&
 637             crypto_info->version != TLS_1_3_VERSION) {
 638                 rc = -EINVAL;
 639                 goto err_crypto_info;
 640         }
 641
 642         /* Ensure that TLS version and ciphers are same in both directions */
 643         if (TLS_CRYPTO_INFO_READY(alt_crypto_info)) {
 644                 if (alt_crypto_info->version != crypto_info->version ||
 645                     alt_crypto_info->cipher_type != crypto_info->cipher_type) {
 646                         rc = -EINVAL;
 647                         goto err_crypto_info;
 648                 }
 649         }
 650
 651         switch (crypto_info->cipher_type) {
 652         case TLS_CIPHER_AES_GCM_128:
 653                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_128);
 654                 break;
 655         case TLS_CIPHER_AES_GCM_256: {
 656                 optsize = sizeof(struct tls12_crypto_info_aes_gcm_256);
 657                 break;
 658         }
 659         case TLS_CIPHER_AES_CCM_128:
 660                 optsize = sizeof(struct tls12_crypto_info_aes_ccm_128);
 661                 break;
 662         case TLS_CIPHER_CHACHA20_POLY1305:
 663                 optsize = sizeof(struct tls12_crypto_info_chacha20_poly1305);
 664                 break;
 665         case TLS_CIPHER_SM4_GCM:
 666                 optsize = sizeof(struct tls12_crypto_info_sm4_gcm);
 667                 break;
 668         case TLS_CIPHER_SM4_CCM:
 669                 optsize = sizeof(struct tls12_crypto_info_sm4_ccm);
 670                 break;
 671         default:
 672                 rc = -EINVAL;
 673                 goto err_crypto_info;
 674         }
 675
 676         if (optlen != optsize) {
 677                 rc = -EINVAL;
 678                 goto err_crypto_info;
 679         }
 680
 681         rc = copy_from_sockptr_offset(crypto_info + 1, optval,
 682                                       sizeof(*crypto_info),
 683                                       optlen - sizeof(*crypto_info));
 684         if (rc) {
 685                 rc = -EFAULT;
 686                 goto err_crypto_info;
 687         }
 688
 689         if (tx) {
 690                 rc = tls_set_device_offload(sk, ctx);
 691                 conf = TLS_HW;
 692                 if (!rc) {
 693                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXDEVICE);
 694                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXDEVICE);
 695                 } else {
 696                         rc = tls_set_sw_offload(sk, ctx, 1);
 697                         if (rc)
 698                                 goto err_crypto_info;
 699                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSTXSW);
 700                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRTXSW);
 701                         conf = TLS_SW;
 702                 }
 703         } else {
 704                 rc = tls_set_device_offload_rx(sk, ctx);
 705                 conf = TLS_HW;
 706                 if (!rc) {
 707                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICE);
 708                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXDEVICE);
 709                 } else {
 710                         rc = tls_set_sw_offload(sk, ctx, 0);
 711                         if (rc)
 712                                 goto err_crypto_info;
 713                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXSW);
 714                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSCURRRXSW);
 715                         conf = TLS_SW;
 716                 }
 717                 tls_sw_strparser_arm(sk, ctx);
 718         }
 719
 720         if (tx)
 721                 ctx->tx_conf = conf;
 722         else
 723                 ctx->rx_conf = conf;
 724         update_sk_prot(sk, ctx);
 725         if (tx) {
 726                 ctx->sk_write_space = sk->sk_write_space;
 727                 sk->sk_write_space = tls_write_space;
 728         }
 729         return 0;
 730
 731 err_crypto_info:
 732         memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
 733         return rc;
 734 }
 735
 736 static int do_tls_setsockopt_tx_zc(struct sock *sk, sockptr_t optval,
 737                                    unsigned int optlen)
 738 {
 739         struct tls_context *ctx = tls_get_ctx(sk);
 740         unsigned int value;
 741
 742         if (sockptr_is_null(optval) || optlen != sizeof(value))
 743                 return -EINVAL;
 744
 745         if (copy_from_sockptr(&value, optval, sizeof(value)))
 746                 return -EFAULT;
 747
 748         if (value > 1)
 749                 return -EINVAL;
 750
 751         ctx->zerocopy_sendfile = value;
 752
 753         return 0;
 754 }
 755
 756 static int do_tls_setsockopt_no_pad(struct sock *sk, sockptr_t optval,
 757                                     unsigned int optlen)
 758 {
 759         struct tls_context *ctx = tls_get_ctx(sk);
 760         u32 val;
 761         int rc;
 762
 763         if (ctx->prot_info.version != TLS_1_3_VERSION ||
 764             sockptr_is_null(optval) || optlen < sizeof(val))
 765                 return -EINVAL;
 766
 767         rc = copy_from_sockptr(&val, optval, sizeof(val));
 768         if (rc)
 769                 return -EFAULT;
 770         if (val > 1)
 771                 return -EINVAL;
 772         rc = check_zeroed_sockptr(optval, sizeof(val), optlen - sizeof(val));
 773         if (rc < 1)
 774                 return rc == 0 ? -EINVAL : rc;
 775
 776         lock_sock(sk);
 777         rc = -EINVAL;
 778         if (ctx->rx_conf == TLS_SW || ctx->rx_conf == TLS_HW) {
 779                 ctx->rx_no_pad = val;
 780                 tls_update_rx_zc_capable(ctx);
 781                 rc = 0;
 782         }
 783         release_sock(sk);
 784
 785         return rc;
 786 }
 787
 788 static int do_tls_setsockopt(struct sock *sk, int optname, sockptr_t optval,
 789                              unsigned int optlen)
 790 {
 791         int rc = 0;
 792
 793         switch (optname) {
 794         case TLS_TX:
 795         case TLS_RX:
 796                 lock_sock(sk);
 797                 rc = do_tls_setsockopt_conf(sk, optval, optlen,
 798                                             optname == TLS_TX);
 799                 release_sock(sk);
 800                 break;
 801         case TLS_TX_ZEROCOPY_RO:
 802                 lock_sock(sk);
 803                 rc = do_tls_setsockopt_tx_zc(sk, optval, optlen);
 804                 release_sock(sk);
 805                 break;
 806         case TLS_RX_EXPECT_NO_PAD:
 807                 rc = do_tls_setsockopt_no_pad(sk, optval, optlen);
 808                 break;
 809         default:
 810                 rc = -ENOPROTOOPT;
 811                 break;
 812         }
 813         return rc;
 814 }
 815
 816 static int tls_setsockopt(struct sock *sk, int level, int optname,
 817                           sockptr_t optval, unsigned int optlen)
 818 {
 819         struct tls_context *ctx = tls_get_ctx(sk);
 820
 821         if (level != SOL_TLS)
 822                 return ctx->sk_proto->setsockopt(sk, level, optname, optval,
 823                                                  optlen);
 824
 825         return do_tls_setsockopt(sk, optname, optval, optlen);
 826 }
 827
 828 struct tls_context *tls_ctx_create(struct sock *sk)
 829 {
 830         struct inet_connection_sock *icsk = inet_csk(sk);
 831         struct tls_context *ctx;
 832
 833         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 834         if (!ctx)
 835                 return NULL;
 836
 837         mutex_init(&ctx->tx_lock);
 838         rcu_assign_pointer(icsk->icsk_ulp_data, ctx);
 839         ctx->sk_proto = READ_ONCE(sk->sk_prot);
 840         ctx->sk = sk;
 841         return ctx;
 842 }
 843
 844 static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 845                             const struct proto_ops *base)
 846 {
 847         ops[TLS_BASE][TLS_BASE] = *base;
 848
 849         ops[TLS_SW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 850         ops[TLS_SW  ][TLS_BASE].sendpage_locked = tls_sw_sendpage_locked;
 851
 852         ops[TLS_BASE][TLS_SW  ] = ops[TLS_BASE][TLS_BASE];
 853         ops[TLS_BASE][TLS_SW  ].splice_read     = tls_sw_splice_read;
 854
 855         ops[TLS_SW  ][TLS_SW  ] = ops[TLS_SW  ][TLS_BASE];
 856         ops[TLS_SW  ][TLS_SW  ].splice_read     = tls_sw_splice_read;
 857
 858 #ifdef CONFIG_TLS_DEVICE
 859         ops[TLS_HW  ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];
 860         ops[TLS_HW  ][TLS_BASE].sendpage_locked = NULL;
 861
 862         ops[TLS_HW  ][TLS_SW  ] = ops[TLS_BASE][TLS_SW  ];
 863         ops[TLS_HW  ][TLS_SW  ].sendpage_locked = NULL;
 864
 865         ops[TLS_BASE][TLS_HW  ] = ops[TLS_BASE][TLS_SW  ];
 866
 867         ops[TLS_SW  ][TLS_HW  ] = ops[TLS_SW  ][TLS_SW  ];
 868
 869         ops[TLS_HW  ][TLS_HW  ] = ops[TLS_HW  ][TLS_SW  ];
 870         ops[TLS_HW  ][TLS_HW  ].sendpage_locked = NULL;
 871 #endif
 872 #ifdef CONFIG_TLS_TOE
 873         ops[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 874 #endif
 875 }
 876
 877 static void tls_build_proto(struct sock *sk)
 878 {
 879         int ip_ver = sk->sk_family == AF_INET6 ? TLSV6 : TLSV4;
 880         struct proto *prot = READ_ONCE(sk->sk_prot);
 881
 882         /* Build IPv6 TLS whenever the address of tcpv6 _prot changes */
 883         if (ip_ver == TLSV6 &&
 884             unlikely(prot != smp_load_acquire(&saved_tcpv6_prot))) {
 885                 mutex_lock(&tcpv6_prot_mutex);
 886                 if (likely(prot != saved_tcpv6_prot)) {
 887                         build_protos(tls_prots[TLSV6], prot);
 888                         build_proto_ops(tls_proto_ops[TLSV6],
 889                                         sk->sk_socket->ops);
 890                         smp_store_release(&saved_tcpv6_prot, prot);
 891                 }
 892                 mutex_unlock(&tcpv6_prot_mutex);
 893         }
 894
 895         if (ip_ver == TLSV4 &&
 896             unlikely(prot != smp_load_acquire(&saved_tcpv4_prot))) {
 897                 mutex_lock(&tcpv4_prot_mutex);
 898                 if (likely(prot != saved_tcpv4_prot)) {
 899                         build_protos(tls_prots[TLSV4], prot);
 900                         build_proto_ops(tls_proto_ops[TLSV4],
 901                                         sk->sk_socket->ops);
 902                         smp_store_release(&saved_tcpv4_prot, prot);
 903                 }
 904                 mutex_unlock(&tcpv4_prot_mutex);
 905         }
 906 }
 907
 908 static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],
 909                          const struct proto *base)
 910 {
 911         prot[TLS_BASE][TLS_BASE] = *base;
 912         prot[TLS_BASE][TLS_BASE].setsockopt     = tls_setsockopt;
 913         prot[TLS_BASE][TLS_BASE].getsockopt     = tls_getsockopt;
 914         prot[TLS_BASE][TLS_BASE].close          = tls_sk_proto_close;
 915
 916         prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 917         prot[TLS_SW][TLS_BASE].sendmsg          = tls_sw_sendmsg;
 918         prot[TLS_SW][TLS_BASE].sendpage         = tls_sw_sendpage;
 919
 920         prot[TLS_BASE][TLS_SW] = prot[TLS_BASE][TLS_BASE];
 921         prot[TLS_BASE][TLS_SW].recvmsg            = tls_sw_recvmsg;
 922         prot[TLS_BASE][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
 923         prot[TLS_BASE][TLS_SW].close              = tls_sk_proto_close;
 924
 925         prot[TLS_SW][TLS_SW] = prot[TLS_SW][TLS_BASE];
 926         prot[TLS_SW][TLS_SW].recvmsg            = tls_sw_recvmsg;
 927         prot[TLS_SW][TLS_SW].sock_is_readable   = tls_sw_sock_is_readable;
 928         prot[TLS_SW][TLS_SW].close              = tls_sk_proto_close;
 929
 930 #ifdef CONFIG_TLS_DEVICE
 931         prot[TLS_HW][TLS_BASE] = prot[TLS_BASE][TLS_BASE];
 932         prot[TLS_HW][TLS_BASE].sendmsg          = tls_device_sendmsg;
 933         prot[TLS_HW][TLS_BASE].sendpage         = tls_device_sendpage;
 934
 935         prot[TLS_HW][TLS_SW] = prot[TLS_BASE][TLS_SW];
 936         prot[TLS_HW][TLS_SW].sendmsg            = tls_device_sendmsg;
 937         prot[TLS_HW][TLS_SW].sendpage           = tls_device_sendpage;
 938
 939         prot[TLS_BASE][TLS_HW] = prot[TLS_BASE][TLS_SW];
 940
 941         prot[TLS_SW][TLS_HW] = prot[TLS_SW][TLS_SW];
 942
 943         prot[TLS_HW][TLS_HW] = prot[TLS_HW][TLS_SW];
 944 #endif
 945 #ifdef CONFIG_TLS_TOE
 946         prot[TLS_HW_RECORD][TLS_HW_RECORD] = *base;
 947         prot[TLS_HW_RECORD][TLS_HW_RECORD].hash         = tls_toe_hash;
 948         prot[TLS_HW_RECORD][TLS_HW_RECORD].unhash       = tls_toe_unhash;
 949 #endif
 950 }
 951
 952 static int tls_init(struct sock *sk)
 953 {
 954         struct tls_context *ctx;
 955         int rc = 0;
 956
 957         tls_build_proto(sk);
 958
 959 #ifdef CONFIG_TLS_TOE
 960         if (tls_toe_bypass(sk))
 961                 return 0;
 962 #endif
 963
 964         /* The TLS ulp is currently supported only for TCP sockets
 965          * in ESTABLISHED state.
 966          * Supporting sockets in LISTEN state will require us
 967          * to modify the accept implementation to clone rather then
 968          * share the ulp context.
 969          */
 970         if (sk->sk_state != TCP_ESTABLISHED)
 971                 return -ENOTCONN;
 972
 973         /* allocate tls context */
 974         write_lock_bh(&sk->sk_callback_lock);
 975         ctx = tls_ctx_create(sk);
 976         if (!ctx) {
 977                 rc = -ENOMEM;
 978                 goto out;
 979         }
 980
 981         ctx->tx_conf = TLS_BASE;
 982         ctx->rx_conf = TLS_BASE;
 983         update_sk_prot(sk, ctx);
 984 out:
 985         write_unlock_bh(&sk->sk_callback_lock);
 986         return rc;
 987 }
 988
 989 static void tls_update(struct sock *sk, struct proto *p,
 990                        void (*write_space)(struct sock *sk))
 991 {
 992         struct tls_context *ctx;
 993
 994         WARN_ON_ONCE(sk->sk_prot == p);
 995
 996         ctx = tls_get_ctx(sk);
 997         if (likely(ctx)) {
 998                 ctx->sk_write_space = write_space;
 999                 ctx->sk_proto = p;
1000         } else {
1001                 /* Pairs with lockless read in sk_clone_lock(). */
1002                 WRITE_ONCE(sk->sk_prot, p);
1003                 sk->sk_write_space = write_space;
1004         }
1005 }
1006
1007 static u16 tls_user_config(struct tls_context *ctx, bool tx)
1008 {
1009         u16 config = tx ? ctx->tx_conf : ctx->rx_conf;
1010
1011         switch (config) {
1012         case TLS_BASE:
1013                 return TLS_CONF_BASE;
1014         case TLS_SW:
1015                 return TLS_CONF_SW;
1016         case TLS_HW:
1017                 return TLS_CONF_HW;
1018         case TLS_HW_RECORD:
1019                 return TLS_CONF_HW_RECORD;
1020         }
1021         return 0;
1022 }
1023
1024 static int tls_get_info(const struct sock *sk, struct sk_buff *skb)
1025 {
1026         u16 version, cipher_type;
1027         struct tls_context *ctx;
1028         struct nlattr *start;
1029         int err;
1030
1031         start = nla_nest_start_noflag(skb, INET_ULP_INFO_TLS);
1032         if (!start)
1033                 return -EMSGSIZE;
1034
1035         rcu_read_lock();
1036         ctx = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
1037         if (!ctx) {
1038                 err = 0;
1039                 goto nla_failure;
1040         }
1041         version = ctx->prot_info.version;
1042         if (version) {
1043                 err = nla_put_u16(skb, TLS_INFO_VERSION, version);
1044                 if (err)
1045                         goto nla_failure;
1046         }
1047         cipher_type = ctx->prot_info.cipher_type;
1048         if (cipher_type) {
1049                 err = nla_put_u16(skb, TLS_INFO_CIPHER, cipher_type);
1050                 if (err)
1051                         goto nla_failure;
1052         }
1053         err = nla_put_u16(skb, TLS_INFO_TXCONF, tls_user_config(ctx, true));
1054         if (err)
1055                 goto nla_failure;
1056
1057         err = nla_put_u16(skb, TLS_INFO_RXCONF, tls_user_config(ctx, false));
1058         if (err)
1059                 goto nla_failure;
1060
1061         if (ctx->tx_conf == TLS_HW && ctx->zerocopy_sendfile) {
1062                 err = nla_put_flag(skb, TLS_INFO_ZC_RO_TX);
1063                 if (err)
1064                         goto nla_failure;
1065         }
1066         if (ctx->rx_no_pad) {
1067                 err = nla_put_flag(skb, TLS_INFO_RX_NO_PAD);
1068                 if (err)
1069                         goto nla_failure;
1070         }
1071
1072         rcu_read_unlock();
1073         nla_nest_end(skb, start);
1074         return 0;
1075
1076 nla_failure:
1077         rcu_read_unlock();
1078         nla_nest_cancel(skb, start);
1079         return err;
1080 }
1081
1082 static size_t tls_get_info_size(const struct sock *sk)
1083 {
1084         size_t size = 0;
1085
1086         size += nla_total_size(0) +             /* INET_ULP_INFO_TLS */
1087                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_VERSION */
1088                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_CIPHER */
1089                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_RXCONF */
1090                 nla_total_size(sizeof(u16)) +   /* TLS_INFO_TXCONF */
1091                 nla_total_size(0) +             /* TLS_INFO_ZC_RO_TX */
1092                 nla_total_size(0) +             /* TLS_INFO_RX_NO_PAD */
1093                 0;
1094
1095         return size;
1096 }
1097
1098 static int __net_init tls_init_net(struct net *net)
1099 {
1100         int err;
1101
1102         net->mib.tls_statistics = alloc_percpu(struct linux_tls_mib);
1103         if (!net->mib.tls_statistics)
1104                 return -ENOMEM;
1105
1106         err = tls_proc_init(net);
1107         if (err)
1108                 goto err_free_stats;
1109
1110         return 0;
1111 err_free_stats:
1112         free_percpu(net->mib.tls_statistics);
1113         return err;
1114 }
1115
1116 static void __net_exit tls_exit_net(struct net *net)
1117 {
1118         tls_proc_fini(net);
1119         free_percpu(net->mib.tls_statistics);
1120 }
1121
1122 static struct pernet_operations tls_proc_ops = {
1123         .init = tls_init_net,
1124         .exit = tls_exit_net,
1125 };
1126
1127 static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
1128         .name                   = "tls",
1129         .owner                  = THIS_MODULE,
1130         .init                   = tls_init,
1131         .update                 = tls_update,
1132         .get_info               = tls_get_info,
1133         .get_info_size          = tls_get_info_size,
1134 };
1135
1136 static int __init tls_register(void)
1137 {
1138         int err;
1139
1140         err = register_pernet_subsys(&tls_proc_ops);
1141         if (err)
1142                 return err;
1143
1144         err = tls_device_init();
1145         if (err) {
1146                 unregister_pernet_subsys(&tls_proc_ops);
1147                 return err;
1148         }
1149
1150         tcp_register_ulp(&tcp_tls_ulp_ops);
1151
1152         return 0;
1153 }
1154
1155 static void __exit tls_unregister(void)
1156 {
1157         tcp_unregister_ulp(&tcp_tls_ulp_ops);
1158         tls_device_cleanup();
1159         unregister_pernet_subsys(&tls_proc_ops);
1160 }
1161
1162 module_init(tls_register);
1163 module_exit(tls_unregister);