net/tls/tls_main.c

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