net/tls/tls_device.c

   1 /* Copyright (c) 2018, Mellanox Technologies All rights reserved.
   2  *
   3  * This software is available to you under a choice of one of two
   4  * licenses.  You may choose to be licensed under the terms of the GNU
   5  * General Public License (GPL) Version 2, available from the file
   6  * COPYING in the main directory of this source tree, or the
   7  * OpenIB.org BSD license below:
   8  *
   9  *     Redistribution and use in source and binary forms, with or
  10  *     without modification, are permitted provided that the following
  11  *     conditions are met:
  12  *
  13  *      - Redistributions of source code must retain the above
  14  *        copyright notice, this list of conditions and the following
  15  *        disclaimer.
  16  *
  17  *      - Redistributions in binary form must reproduce the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer in the documentation and/or other materials
  20  *        provided with the distribution.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  26  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  27  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  28  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  29  * SOFTWARE.
  30  */
  31
  32 #include <crypto/aead.h>
  33 #include <linux/highmem.h>
  34 #include <linux/module.h>
  35 #include <linux/netdevice.h>
  36 #include <net/dst.h>
  37 #include <net/inet_connection_sock.h>
  38 #include <net/tcp.h>
  39 #include <net/tls.h>
  40
  41 #include "trace.h"
  42
  43 /* device_offload_lock is used to synchronize tls_dev_add
  44  * against NETDEV_DOWN notifications.
  45  */
  46 static DECLARE_RWSEM(device_offload_lock);
  47
  48 static void tls_device_gc_task(struct work_struct *work);
  49
  50 static DECLARE_WORK(tls_device_gc_work, tls_device_gc_task);
  51 static LIST_HEAD(tls_device_gc_list);
  52 static LIST_HEAD(tls_device_list);
  53 static DEFINE_SPINLOCK(tls_device_lock);
  54
  55 static void tls_device_free_ctx(struct tls_context *ctx)
  56 {
  57         if (ctx->tx_conf == TLS_HW) {
  58                 kfree(tls_offload_ctx_tx(ctx));
  59                 kfree(ctx->tx.rec_seq);
  60                 kfree(ctx->tx.iv);
  61         }
  62
  63         if (ctx->rx_conf == TLS_HW)
  64                 kfree(tls_offload_ctx_rx(ctx));
  65
  66         tls_ctx_free(NULL, ctx);
  67 }
  68
  69 static void tls_device_gc_task(struct work_struct *work)
  70 {
  71         struct tls_context *ctx, *tmp;
  72         unsigned long flags;
  73         LIST_HEAD(gc_list);
  74
  75         spin_lock_irqsave(&tls_device_lock, flags);
  76         list_splice_init(&tls_device_gc_list, &gc_list);
  77         spin_unlock_irqrestore(&tls_device_lock, flags);
  78
  79         list_for_each_entry_safe(ctx, tmp, &gc_list, list) {
  80                 struct net_device *netdev = ctx->netdev;
  81
  82                 if (netdev && ctx->tx_conf == TLS_HW) {
  83                         netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
  84                                                         TLS_OFFLOAD_CTX_DIR_TX);
  85                         dev_put(netdev);
  86                         ctx->netdev = NULL;
  87                 }
  88
  89                 list_del(&ctx->list);
  90                 tls_device_free_ctx(ctx);
  91         }
  92 }
  93
  94 static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
  95 {
  96         unsigned long flags;
  97
  98         spin_lock_irqsave(&tls_device_lock, flags);
  99         list_move_tail(&ctx->list, &tls_device_gc_list);
 100
 101         /* schedule_work inside the spinlock
 102          * to make sure tls_device_down waits for that work.
 103          */
 104         schedule_work(&tls_device_gc_work);
 105
 106         spin_unlock_irqrestore(&tls_device_lock, flags);
 107 }
 108
 109 /* We assume that the socket is already connected */
 110 static struct net_device *get_netdev_for_sock(struct sock *sk)
 111 {
 112         struct dst_entry *dst = sk_dst_get(sk);
 113         struct net_device *netdev = NULL;
 114
 115         if (likely(dst)) {
 116                 netdev = dst->dev;
 117                 dev_hold(netdev);
 118         }
 119
 120         dst_release(dst);
 121
 122         return netdev;
 123 }
 124
 125 static void destroy_record(struct tls_record_info *record)
 126 {
 127         int i;
 128
 129         for (i = 0; i < record->num_frags; i++)
 130                 __skb_frag_unref(&record->frags[i]);
 131         kfree(record);
 132 }
 133
 134 static void delete_all_records(struct tls_offload_context_tx *offload_ctx)
 135 {
 136         struct tls_record_info *info, *temp;
 137
 138         list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) {
 139                 list_del(&info->list);
 140                 destroy_record(info);
 141         }
 142
 143         offload_ctx->retransmit_hint = NULL;
 144 }
 145
 146 static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq)
 147 {
 148         struct tls_context *tls_ctx = tls_get_ctx(sk);
 149         struct tls_record_info *info, *temp;
 150         struct tls_offload_context_tx *ctx;
 151         u64 deleted_records = 0;
 152         unsigned long flags;
 153
 154         if (!tls_ctx)
 155                 return;
 156
 157         ctx = tls_offload_ctx_tx(tls_ctx);
 158
 159         spin_lock_irqsave(&ctx->lock, flags);
 160         info = ctx->retransmit_hint;
 161         if (info && !before(acked_seq, info->end_seq))
 162                 ctx->retransmit_hint = NULL;
 163
 164         list_for_each_entry_safe(info, temp, &ctx->records_list, list) {
 165                 if (before(acked_seq, info->end_seq))
 166                         break;
 167                 list_del(&info->list);
 168
 169                 destroy_record(info);
 170                 deleted_records++;
 171         }
 172
 173         ctx->unacked_record_sn += deleted_records;
 174         spin_unlock_irqrestore(&ctx->lock, flags);
 175 }
 176
 177 /* At this point, there should be no references on this
 178  * socket and no in-flight SKBs associated with this
 179  * socket, so it is safe to free all the resources.
 180  */
 181 static void tls_device_sk_destruct(struct sock *sk)
 182 {
 183         struct tls_context *tls_ctx = tls_get_ctx(sk);
 184         struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
 185
 186         tls_ctx->sk_destruct(sk);
 187
 188         if (tls_ctx->tx_conf == TLS_HW) {
 189                 if (ctx->open_record)
 190                         destroy_record(ctx->open_record);
 191                 delete_all_records(ctx);
 192                 crypto_free_aead(ctx->aead_send);
 193                 clean_acked_data_disable(inet_csk(sk));
 194         }
 195
 196         if (refcount_dec_and_test(&tls_ctx->refcount))
 197                 tls_device_queue_ctx_destruction(tls_ctx);
 198 }
 199
 200 void tls_device_free_resources_tx(struct sock *sk)
 201 {
 202         struct tls_context *tls_ctx = tls_get_ctx(sk);
 203
 204         tls_free_partial_record(sk, tls_ctx);
 205 }
 206
 207 void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq)
 208 {
 209         struct tls_context *tls_ctx = tls_get_ctx(sk);
 210
 211         trace_tls_device_tx_resync_req(sk, got_seq, exp_seq);
 212         WARN_ON(test_and_set_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags));
 213 }
 214 EXPORT_SYMBOL_GPL(tls_offload_tx_resync_request);
 215
 216 static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx,
 217                                  u32 seq)
 218 {
 219         struct net_device *netdev;
 220         struct sk_buff *skb;
 221         int err = 0;
 222         u8 *rcd_sn;
 223
 224         skb = tcp_write_queue_tail(sk);
 225         if (skb)
 226                 TCP_SKB_CB(skb)->eor = 1;
 227
 228         rcd_sn = tls_ctx->tx.rec_seq;
 229
 230         trace_tls_device_tx_resync_send(sk, seq, rcd_sn);
 231         down_read(&device_offload_lock);
 232         netdev = tls_ctx->netdev;
 233         if (netdev)
 234                 err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq,
 235                                                          rcd_sn,
 236                                                          TLS_OFFLOAD_CTX_DIR_TX);
 237         up_read(&device_offload_lock);
 238         if (err)
 239                 return;
 240
 241         clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags);
 242 }
 243
 244 static void tls_append_frag(struct tls_record_info *record,
 245                             struct page_frag *pfrag,
 246                             int size)
 247 {
 248         skb_frag_t *frag;
 249
 250         frag = &record->frags[record->num_frags - 1];
 251         if (skb_frag_page(frag) == pfrag->page &&
 252             skb_frag_off(frag) + skb_frag_size(frag) == pfrag->offset) {
 253                 skb_frag_size_add(frag, size);
 254         } else {
 255                 ++frag;
 256                 __skb_frag_set_page(frag, pfrag->page);
 257                 skb_frag_off_set(frag, pfrag->offset);
 258                 skb_frag_size_set(frag, size);
 259                 ++record->num_frags;
 260                 get_page(pfrag->page);
 261         }
 262
 263         pfrag->offset += size;
 264         record->len += size;
 265 }
 266
 267 static int tls_push_record(struct sock *sk,
 268                            struct tls_context *ctx,
 269                            struct tls_offload_context_tx *offload_ctx,
 270                            struct tls_record_info *record,
 271                            int flags)
 272 {
 273         struct tls_prot_info *prot = &ctx->prot_info;
 274         struct tcp_sock *tp = tcp_sk(sk);
 275         skb_frag_t *frag;
 276         int i;
 277
 278         record->end_seq = tp->write_seq + record->len;
 279         list_add_tail_rcu(&record->list, &offload_ctx->records_list);
 280         offload_ctx->open_record = NULL;
 281
 282         if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags))
 283                 tls_device_resync_tx(sk, ctx, tp->write_seq);
 284
 285         tls_advance_record_sn(sk, prot, &ctx->tx);
 286
 287         for (i = 0; i < record->num_frags; i++) {
 288                 frag = &record->frags[i];
 289                 sg_unmark_end(&offload_ctx->sg_tx_data[i]);
 290                 sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag),
 291                             skb_frag_size(frag), skb_frag_off(frag));
 292                 sk_mem_charge(sk, skb_frag_size(frag));
 293                 get_page(skb_frag_page(frag));
 294         }
 295         sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]);
 296
 297         /* all ready, send */
 298         return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags);
 299 }
 300
 301 static int tls_device_record_close(struct sock *sk,
 302                                    struct tls_context *ctx,
 303                                    struct tls_record_info *record,
 304                                    struct page_frag *pfrag,
 305                                    unsigned char record_type)
 306 {
 307         struct tls_prot_info *prot = &ctx->prot_info;
 308         int ret;
 309
 310         /* append tag
 311          * device will fill in the tag, we just need to append a placeholder
 312          * use socket memory to improve coalescing (re-using a single buffer
 313          * increases frag count)
 314          * if we can't allocate memory now, steal some back from data
 315          */
 316         if (likely(skb_page_frag_refill(prot->tag_size, pfrag,
 317                                         sk->sk_allocation))) {
 318                 ret = 0;
 319                 tls_append_frag(record, pfrag, prot->tag_size);
 320         } else {
 321                 ret = prot->tag_size;
 322                 if (record->len <= prot->overhead_size)
 323                         return -ENOMEM;
 324         }
 325
 326         /* fill prepend */
 327         tls_fill_prepend(ctx, skb_frag_address(&record->frags[0]),
 328                          record->len - prot->overhead_size,
 329                          record_type, prot->version);
 330         return ret;
 331 }
 332
 333 static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx,
 334                                  struct page_frag *pfrag,
 335                                  size_t prepend_size)
 336 {
 337         struct tls_record_info *record;
 338         skb_frag_t *frag;
 339
 340         record = kmalloc(sizeof(*record), GFP_KERNEL);
 341         if (!record)
 342                 return -ENOMEM;
 343
 344         frag = &record->frags[0];
 345         __skb_frag_set_page(frag, pfrag->page);
 346         skb_frag_off_set(frag, pfrag->offset);
 347         skb_frag_size_set(frag, prepend_size);
 348
 349         get_page(pfrag->page);
 350         pfrag->offset += prepend_size;
 351
 352         record->num_frags = 1;
 353         record->len = prepend_size;
 354         offload_ctx->open_record = record;
 355         return 0;
 356 }
 357
 358 static int tls_do_allocation(struct sock *sk,
 359                              struct tls_offload_context_tx *offload_ctx,
 360                              struct page_frag *pfrag,
 361                              size_t prepend_size)
 362 {
 363         int ret;
 364
 365         if (!offload_ctx->open_record) {
 366                 if (unlikely(!skb_page_frag_refill(prepend_size, pfrag,
 367                                                    sk->sk_allocation))) {
 368                         sk->sk_prot->enter_memory_pressure(sk);
 369                         sk_stream_moderate_sndbuf(sk);
 370                         return -ENOMEM;
 371                 }
 372
 373                 ret = tls_create_new_record(offload_ctx, pfrag, prepend_size);
 374                 if (ret)
 375                         return ret;
 376
 377                 if (pfrag->size > pfrag->offset)
 378                         return 0;
 379         }
 380
 381         if (!sk_page_frag_refill(sk, pfrag))
 382                 return -ENOMEM;
 383
 384         return 0;
 385 }
 386
 387 static int tls_device_copy_data(void *addr, size_t bytes, struct iov_iter *i)
 388 {
 389         size_t pre_copy, nocache;
 390
 391         pre_copy = ~((unsigned long)addr - 1) & (SMP_CACHE_BYTES - 1);
 392         if (pre_copy) {
 393                 pre_copy = min(pre_copy, bytes);
 394                 if (copy_from_iter(addr, pre_copy, i) != pre_copy)
 395                         return -EFAULT;
 396                 bytes -= pre_copy;
 397                 addr += pre_copy;
 398         }
 399
 400         nocache = round_down(bytes, SMP_CACHE_BYTES);
 401         if (copy_from_iter_nocache(addr, nocache, i) != nocache)
 402                 return -EFAULT;
 403         bytes -= nocache;
 404         addr += nocache;
 405
 406         if (bytes && copy_from_iter(addr, bytes, i) != bytes)
 407                 return -EFAULT;
 408
 409         return 0;
 410 }
 411
 412 static int tls_push_data(struct sock *sk,
 413                          struct iov_iter *msg_iter,
 414                          size_t size, int flags,
 415                          unsigned char record_type)
 416 {
 417         struct tls_context *tls_ctx = tls_get_ctx(sk);
 418         struct tls_prot_info *prot = &tls_ctx->prot_info;
 419         struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
 420         int more = flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE);
 421         struct tls_record_info *record = ctx->open_record;
 422         int tls_push_record_flags;
 423         struct page_frag *pfrag;
 424         size_t orig_size = size;
 425         u32 max_open_record_len;
 426         int copy, rc = 0;
 427         bool done = false;
 428         long timeo;
 429
 430         if (flags &
 431             ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST))
 432                 return -EOPNOTSUPP;
 433
 434         if (unlikely(sk->sk_err))
 435                 return -sk->sk_err;
 436
 437         flags |= MSG_SENDPAGE_DECRYPTED;
 438         tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST;
 439
 440         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
 441         if (tls_is_partially_sent_record(tls_ctx)) {
 442                 rc = tls_push_partial_record(sk, tls_ctx, flags);
 443                 if (rc < 0)
 444                         return rc;
 445         }
 446
 447         pfrag = sk_page_frag(sk);
 448
 449         /* TLS_HEADER_SIZE is not counted as part of the TLS record, and
 450          * we need to leave room for an authentication tag.
 451          */
 452         max_open_record_len = TLS_MAX_PAYLOAD_SIZE +
 453                               prot->prepend_size;
 454         do {
 455                 rc = tls_do_allocation(sk, ctx, pfrag, prot->prepend_size);
 456                 if (unlikely(rc)) {
 457                         rc = sk_stream_wait_memory(sk, &timeo);
 458                         if (!rc)
 459                                 continue;
 460
 461                         record = ctx->open_record;
 462                         if (!record)
 463                                 break;
 464 handle_error:
 465                         if (record_type != TLS_RECORD_TYPE_DATA) {
 466                                 /* avoid sending partial
 467                                  * record with type !=
 468                                  * application_data
 469                                  */
 470                                 size = orig_size;
 471                                 destroy_record(record);
 472                                 ctx->open_record = NULL;
 473                         } else if (record->len > prot->prepend_size) {
 474                                 goto last_record;
 475                         }
 476
 477                         break;
 478                 }
 479
 480                 record = ctx->open_record;
 481                 copy = min_t(size_t, size, (pfrag->size - pfrag->offset));
 482                 copy = min_t(size_t, copy, (max_open_record_len - record->len));
 483
 484                 rc = tls_device_copy_data(page_address(pfrag->page) +
 485                                           pfrag->offset, copy, msg_iter);
 486                 if (rc)
 487                         goto handle_error;
 488                 tls_append_frag(record, pfrag, copy);
 489
 490                 size -= copy;
 491                 if (!size) {
 492 last_record:
 493                         tls_push_record_flags = flags;
 494                         if (more) {
 495                                 tls_ctx->pending_open_record_frags =
 496                                                 !!record->num_frags;
 497                                 break;
 498                         }
 499
 500                         done = true;
 501                 }
 502
 503                 if (done || record->len >= max_open_record_len ||
 504                     (record->num_frags >= MAX_SKB_FRAGS - 1)) {
 505                         rc = tls_device_record_close(sk, tls_ctx, record,
 506                                                      pfrag, record_type);
 507                         if (rc) {
 508                                 if (rc > 0) {
 509                                         size += rc;
 510                                 } else {
 511                                         size = orig_size;
 512                                         destroy_record(record);
 513                                         ctx->open_record = NULL;
 514                                         break;
 515                                 }
 516                         }
 517
 518                         rc = tls_push_record(sk,
 519                                              tls_ctx,
 520                                              ctx,
 521                                              record,
 522                                              tls_push_record_flags);
 523                         if (rc < 0)
 524                                 break;
 525                 }
 526         } while (!done);
 527
 528         if (orig_size - size > 0)
 529                 rc = orig_size - size;
 530
 531         return rc;
 532 }
 533
 534 int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 535 {
 536         unsigned char record_type = TLS_RECORD_TYPE_DATA;
 537         struct tls_context *tls_ctx = tls_get_ctx(sk);
 538         int rc;
 539
 540         mutex_lock(&tls_ctx->tx_lock);
 541         lock_sock(sk);
 542
 543         if (unlikely(msg->msg_controllen)) {
 544                 rc = tls_proccess_cmsg(sk, msg, &record_type);
 545                 if (rc)
 546                         goto out;
 547         }
 548
 549         rc = tls_push_data(sk, &msg->msg_iter, size,
 550                            msg->msg_flags, record_type);
 551
 552 out:
 553         release_sock(sk);
 554         mutex_unlock(&tls_ctx->tx_lock);
 555         return rc;
 556 }
 557
 558 int tls_device_sendpage(struct sock *sk, struct page *page,
 559                         int offset, size_t size, int flags)
 560 {
 561         struct tls_context *tls_ctx = tls_get_ctx(sk);
 562         struct iov_iter msg_iter;
 563         char *kaddr = kmap(page);
 564         struct kvec iov;
 565         int rc;
 566
 567         if (flags & MSG_SENDPAGE_NOTLAST)
 568                 flags |= MSG_MORE;
 569
 570         mutex_lock(&tls_ctx->tx_lock);
 571         lock_sock(sk);
 572
 573         if (flags & MSG_OOB) {
 574                 rc = -EOPNOTSUPP;
 575                 goto out;
 576         }
 577
 578         iov.iov_base = kaddr + offset;
 579         iov.iov_len = size;
 580         iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size);
 581         rc = tls_push_data(sk, &msg_iter, size,
 582                            flags, TLS_RECORD_TYPE_DATA);
 583         kunmap(page);
 584
 585 out:
 586         release_sock(sk);
 587         mutex_unlock(&tls_ctx->tx_lock);
 588         return rc;
 589 }
 590
 591 struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
 592                                        u32 seq, u64 *p_record_sn)
 593 {
 594         u64 record_sn = context->hint_record_sn;
 595         struct tls_record_info *info;
 596
 597         info = context->retransmit_hint;
 598         if (!info ||
 599             before(seq, info->end_seq - info->len)) {
 600                 /* if retransmit_hint is irrelevant start
 601                  * from the beggining of the list
 602                  */
 603                 info = list_first_entry_or_null(&context->records_list,
 604                                                 struct tls_record_info, list);
 605                 if (!info)
 606                         return NULL;
 607                 record_sn = context->unacked_record_sn;
 608         }
 609
 610         /* We just need the _rcu for the READ_ONCE() */
 611         rcu_read_lock();
 612         list_for_each_entry_from_rcu(info, &context->records_list, list) {
 613                 if (before(seq, info->end_seq)) {
 614                         if (!context->retransmit_hint ||
 615                             after(info->end_seq,
 616                                   context->retransmit_hint->end_seq)) {
 617                                 context->hint_record_sn = record_sn;
 618                                 context->retransmit_hint = info;
 619                         }
 620                         *p_record_sn = record_sn;
 621                         goto exit_rcu_unlock;
 622                 }
 623                 record_sn++;
 624         }
 625         info = NULL;
 626
 627 exit_rcu_unlock:
 628         rcu_read_unlock();
 629         return info;
 630 }
 631 EXPORT_SYMBOL(tls_get_record);
 632
 633 static int tls_device_push_pending_record(struct sock *sk, int flags)
 634 {
 635         struct iov_iter msg_iter;
 636
 637         iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0);
 638         return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA);
 639 }
 640
 641 void tls_device_write_space(struct sock *sk, struct tls_context *ctx)
 642 {
 643         if (tls_is_partially_sent_record(ctx)) {
 644                 gfp_t sk_allocation = sk->sk_allocation;
 645
 646                 WARN_ON_ONCE(sk->sk_write_pending);
 647
 648                 sk->sk_allocation = GFP_ATOMIC;
 649                 tls_push_partial_record(sk, ctx,
 650                                         MSG_DONTWAIT | MSG_NOSIGNAL |
 651                                         MSG_SENDPAGE_DECRYPTED);
 652                 sk->sk_allocation = sk_allocation;
 653         }
 654 }
 655
 656 static void tls_device_resync_rx(struct tls_context *tls_ctx,
 657                                  struct sock *sk, u32 seq, u8 *rcd_sn)
 658 {
 659         struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);
 660         struct net_device *netdev;
 661
 662         if (WARN_ON(test_and_set_bit(TLS_RX_SYNC_RUNNING, &tls_ctx->flags)))
 663                 return;
 664
 665         trace_tls_device_rx_resync_send(sk, seq, rcd_sn, rx_ctx->resync_type);
 666         netdev = READ_ONCE(tls_ctx->netdev);
 667         if (netdev)
 668                 netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn,
 669                                                    TLS_OFFLOAD_CTX_DIR_RX);
 670         clear_bit_unlock(TLS_RX_SYNC_RUNNING, &tls_ctx->flags);
 671         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICERESYNC);
 672 }
 673
 674 void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq)
 675 {
 676         struct tls_context *tls_ctx = tls_get_ctx(sk);
 677         struct tls_offload_context_rx *rx_ctx;
 678         u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE];
 679         u32 sock_data, is_req_pending;
 680         struct tls_prot_info *prot;
 681         s64 resync_req;
 682         u32 req_seq;
 683
 684         if (tls_ctx->rx_conf != TLS_HW)
 685                 return;
 686
 687         prot = &tls_ctx->prot_info;
 688         rx_ctx = tls_offload_ctx_rx(tls_ctx);
 689         memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size);
 690
 691         switch (rx_ctx->resync_type) {
 692         case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ:
 693                 resync_req = atomic64_read(&rx_ctx->resync_req);
 694                 req_seq = resync_req >> 32;
 695                 seq += TLS_HEADER_SIZE - 1;
 696                 is_req_pending = resync_req;
 697
 698                 if (likely(!is_req_pending) || req_seq != seq ||
 699                     !atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0))
 700                         return;
 701                 break;
 702         case TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT:
 703                 if (likely(!rx_ctx->resync_nh_do_now))
 704                         return;
 705
 706                 /* head of next rec is already in, note that the sock_inq will
 707                  * include the currently parsed message when called from parser
 708                  */
 709                 sock_data = tcp_inq(sk);
 710                 if (sock_data > rcd_len) {
 711                         trace_tls_device_rx_resync_nh_delay(sk, sock_data,
 712                                                             rcd_len);
 713                         return;
 714                 }
 715
 716                 rx_ctx->resync_nh_do_now = 0;
 717                 seq += rcd_len;
 718                 tls_bigint_increment(rcd_sn, prot->rec_seq_size);
 719                 break;
 720         }
 721
 722         tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn);
 723 }
 724
 725 static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx,
 726                                            struct tls_offload_context_rx *ctx,
 727                                            struct sock *sk, struct sk_buff *skb)
 728 {
 729         struct strp_msg *rxm;
 730
 731         /* device will request resyncs by itself based on stream scan */
 732         if (ctx->resync_type != TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT)
 733                 return;
 734         /* already scheduled */
 735         if (ctx->resync_nh_do_now)
 736                 return;
 737         /* seen decrypted fragments since last fully-failed record */
 738         if (ctx->resync_nh_reset) {
 739                 ctx->resync_nh_reset = 0;
 740                 ctx->resync_nh.decrypted_failed = 1;
 741                 ctx->resync_nh.decrypted_tgt = TLS_DEVICE_RESYNC_NH_START_IVAL;
 742                 return;
 743         }
 744
 745         if (++ctx->resync_nh.decrypted_failed <= ctx->resync_nh.decrypted_tgt)
 746                 return;
 747
 748         /* doing resync, bump the next target in case it fails */
 749         if (ctx->resync_nh.decrypted_tgt < TLS_DEVICE_RESYNC_NH_MAX_IVAL)
 750                 ctx->resync_nh.decrypted_tgt *= 2;
 751         else
 752                 ctx->resync_nh.decrypted_tgt += TLS_DEVICE_RESYNC_NH_MAX_IVAL;
 753
 754         rxm = strp_msg(skb);
 755
 756         /* head of next rec is already in, parser will sync for us */
 757         if (tcp_inq(sk) > rxm->full_len) {
 758                 trace_tls_device_rx_resync_nh_schedule(sk);
 759                 ctx->resync_nh_do_now = 1;
 760         } else {
 761                 struct tls_prot_info *prot = &tls_ctx->prot_info;
 762                 u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE];
 763
 764                 memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size);
 765                 tls_bigint_increment(rcd_sn, prot->rec_seq_size);
 766
 767                 tls_device_resync_rx(tls_ctx, sk, tcp_sk(sk)->copied_seq,
 768                                      rcd_sn);
 769         }
 770 }
 771
 772 static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb)
 773 {
 774         struct strp_msg *rxm = strp_msg(skb);
 775         int err = 0, offset = rxm->offset, copy, nsg, data_len, pos;
 776         struct sk_buff *skb_iter, *unused;
 777         struct scatterlist sg[1];
 778         char *orig_buf, *buf;
 779
 780         orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE +
 781                            TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation);
 782         if (!orig_buf)
 783                 return -ENOMEM;
 784         buf = orig_buf;
 785
 786         nsg = skb_cow_data(skb, 0, &unused);
 787         if (unlikely(nsg < 0)) {
 788                 err = nsg;
 789                 goto free_buf;
 790         }
 791
 792         sg_init_table(sg, 1);
 793         sg_set_buf(&sg[0], buf,
 794                    rxm->full_len + TLS_HEADER_SIZE +
 795                    TLS_CIPHER_AES_GCM_128_IV_SIZE);
 796         err = skb_copy_bits(skb, offset, buf,
 797                             TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE);
 798         if (err)
 799                 goto free_buf;
 800
 801         /* We are interested only in the decrypted data not the auth */
 802         err = decrypt_skb(sk, skb, sg);
 803         if (err != -EBADMSG)
 804                 goto free_buf;
 805         else
 806                 err = 0;
 807
 808         data_len = rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE;
 809
 810         if (skb_pagelen(skb) > offset) {
 811                 copy = min_t(int, skb_pagelen(skb) - offset, data_len);
 812
 813                 if (skb->decrypted) {
 814                         err = skb_store_bits(skb, offset, buf, copy);
 815                         if (err)
 816                                 goto free_buf;
 817                 }
 818
 819                 offset += copy;
 820                 buf += copy;
 821         }
 822
 823         pos = skb_pagelen(skb);
 824         skb_walk_frags(skb, skb_iter) {
 825                 int frag_pos;
 826
 827                 /* Practically all frags must belong to msg if reencrypt
 828                  * is needed with current strparser and coalescing logic,
 829                  * but strparser may "get optimized", so let's be safe.
 830                  */
 831                 if (pos + skb_iter->len <= offset)
 832                         goto done_with_frag;
 833                 if (pos >= data_len + rxm->offset)
 834                         break;
 835
 836                 frag_pos = offset - pos;
 837                 copy = min_t(int, skb_iter->len - frag_pos,
 838                              data_len + rxm->offset - offset);
 839
 840                 if (skb_iter->decrypted) {
 841                         err = skb_store_bits(skb_iter, frag_pos, buf, copy);
 842                         if (err)
 843                                 goto free_buf;
 844                 }
 845
 846                 offset += copy;
 847                 buf += copy;
 848 done_with_frag:
 849                 pos += skb_iter->len;
 850         }
 851
 852 free_buf:
 853         kfree(orig_buf);
 854         return err;
 855 }
 856
 857 int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx,
 858                          struct sk_buff *skb, struct strp_msg *rxm)
 859 {
 860         struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx);
 861         int is_decrypted = skb->decrypted;
 862         int is_encrypted = !is_decrypted;
 863         struct sk_buff *skb_iter;
 864
 865         /* Check if all the data is decrypted already */
 866         skb_walk_frags(skb, skb_iter) {
 867                 is_decrypted &= skb_iter->decrypted;
 868                 is_encrypted &= !skb_iter->decrypted;
 869         }
 870
 871         trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len,
 872                                    tls_ctx->rx.rec_seq, rxm->full_len,
 873                                    is_encrypted, is_decrypted);
 874
 875         ctx->sw.decrypted |= is_decrypted;
 876
 877         /* Return immediately if the record is either entirely plaintext or
 878          * entirely ciphertext. Otherwise handle reencrypt partially decrypted
 879          * record.
 880          */
 881         if (is_decrypted) {
 882                 ctx->resync_nh_reset = 1;
 883                 return 0;
 884         }
 885         if (is_encrypted) {
 886                 tls_device_core_ctrl_rx_resync(tls_ctx, ctx, sk, skb);
 887                 return 0;
 888         }
 889
 890         ctx->resync_nh_reset = 1;
 891         return tls_device_reencrypt(sk, skb);
 892 }
 893
 894 static void tls_device_attach(struct tls_context *ctx, struct sock *sk,
 895                               struct net_device *netdev)
 896 {
 897         if (sk->sk_destruct != tls_device_sk_destruct) {
 898                 refcount_set(&ctx->refcount, 1);
 899                 dev_hold(netdev);
 900                 ctx->netdev = netdev;
 901                 spin_lock_irq(&tls_device_lock);
 902                 list_add_tail(&ctx->list, &tls_device_list);
 903                 spin_unlock_irq(&tls_device_lock);
 904
 905                 ctx->sk_destruct = sk->sk_destruct;
 906                 sk->sk_destruct = tls_device_sk_destruct;
 907         }
 908 }
 909
 910 int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
 911 {
 912         u16 nonce_size, tag_size, iv_size, rec_seq_size;
 913         struct tls_context *tls_ctx = tls_get_ctx(sk);
 914         struct tls_prot_info *prot = &tls_ctx->prot_info;
 915         struct tls_record_info *start_marker_record;
 916         struct tls_offload_context_tx *offload_ctx;
 917         struct tls_crypto_info *crypto_info;
 918         struct net_device *netdev;
 919         char *iv, *rec_seq;
 920         struct sk_buff *skb;
 921         __be64 rcd_sn;
 922         int rc;
 923
 924         if (!ctx)
 925                 return -EINVAL;
 926
 927         if (ctx->priv_ctx_tx)
 928                 return -EEXIST;
 929
 930         start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL);
 931         if (!start_marker_record)
 932                 return -ENOMEM;
 933
 934         offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL);
 935         if (!offload_ctx) {
 936                 rc = -ENOMEM;
 937                 goto free_marker_record;
 938         }
 939
 940         crypto_info = &ctx->crypto_send.info;
 941         if (crypto_info->version != TLS_1_2_VERSION) {
 942                 rc = -EOPNOTSUPP;
 943                 goto free_offload_ctx;
 944         }
 945
 946         switch (crypto_info->cipher_type) {
 947         case TLS_CIPHER_AES_GCM_128:
 948                 nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
 949                 tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE;
 950                 iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
 951                 iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv;
 952                 rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE;
 953                 rec_seq =
 954                  ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq;
 955                 break;
 956         default:
 957                 rc = -EINVAL;
 958                 goto free_offload_ctx;
 959         }
 960
 961         /* Sanity-check the rec_seq_size for stack allocations */
 962         if (rec_seq_size > TLS_MAX_REC_SEQ_SIZE) {
 963                 rc = -EINVAL;
 964                 goto free_offload_ctx;
 965         }
 966
 967         prot->version = crypto_info->version;
 968         prot->cipher_type = crypto_info->cipher_type;
 969         prot->prepend_size = TLS_HEADER_SIZE + nonce_size;
 970         prot->tag_size = tag_size;
 971         prot->overhead_size = prot->prepend_size + prot->tag_size;
 972         prot->iv_size = iv_size;
 973         ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 974                              GFP_KERNEL);
 975         if (!ctx->tx.iv) {
 976                 rc = -ENOMEM;
 977                 goto free_offload_ctx;
 978         }
 979
 980         memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size);
 981
 982         prot->rec_seq_size = rec_seq_size;
 983         ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL);
 984         if (!ctx->tx.rec_seq) {
 985                 rc = -ENOMEM;
 986                 goto free_iv;
 987         }
 988
 989         rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info);
 990         if (rc)
 991                 goto free_rec_seq;
 992
 993         /* start at rec_seq - 1 to account for the start marker record */
 994         memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn));
 995         offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1;
 996
 997         start_marker_record->end_seq = tcp_sk(sk)->write_seq;
 998         start_marker_record->len = 0;
 999         start_marker_record->num_frags = 0;
1000
1001         INIT_LIST_HEAD(&offload_ctx->records_list);
1002         list_add_tail(&start_marker_record->list, &offload_ctx->records_list);
1003         spin_lock_init(&offload_ctx->lock);
1004         sg_init_table(offload_ctx->sg_tx_data,
1005                       ARRAY_SIZE(offload_ctx->sg_tx_data));
1006
1007         clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked);
1008         ctx->push_pending_record = tls_device_push_pending_record;
1009
1010         /* TLS offload is greatly simplified if we don't send
1011          * SKBs where only part of the payload needs to be encrypted.
1012          * So mark the last skb in the write queue as end of record.
1013          */
1014         skb = tcp_write_queue_tail(sk);
1015         if (skb)
1016                 TCP_SKB_CB(skb)->eor = 1;
1017
1018         netdev = get_netdev_for_sock(sk);
1019         if (!netdev) {
1020                 pr_err_ratelimited("%s: netdev not found\n", __func__);
1021                 rc = -EINVAL;
1022                 goto disable_cad;
1023         }
1024
1025         if (!(netdev->features & NETIF_F_HW_TLS_TX)) {
1026                 rc = -EOPNOTSUPP;
1027                 goto release_netdev;
1028         }
1029
1030         /* Avoid offloading if the device is down
1031          * We don't want to offload new flows after
1032          * the NETDEV_DOWN event
1033          *
1034          * device_offload_lock is taken in tls_devices's NETDEV_DOWN
1035          * handler thus protecting from the device going down before
1036          * ctx was added to tls_device_list.
1037          */
1038         down_read(&device_offload_lock);
1039         if (!(netdev->flags & IFF_UP)) {
1040                 rc = -EINVAL;
1041                 goto release_lock;
1042         }
1043
1044         ctx->priv_ctx_tx = offload_ctx;
1045         rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX,
1046                                              &ctx->crypto_send.info,
1047                                              tcp_sk(sk)->write_seq);
1048         trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_TX,
1049                                      tcp_sk(sk)->write_seq, rec_seq, rc);
1050         if (rc)
1051                 goto release_lock;
1052
1053         tls_device_attach(ctx, sk, netdev);
1054         up_read(&device_offload_lock);
1055
1056         /* following this assignment tls_is_sk_tx_device_offloaded
1057          * will return true and the context might be accessed
1058          * by the netdev's xmit function.
1059          */
1060         smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb);
1061         dev_put(netdev);
1062
1063         return 0;
1064
1065 release_lock:
1066         up_read(&device_offload_lock);
1067 release_netdev:
1068         dev_put(netdev);
1069 disable_cad:
1070         clean_acked_data_disable(inet_csk(sk));
1071         crypto_free_aead(offload_ctx->aead_send);
1072 free_rec_seq:
1073         kfree(ctx->tx.rec_seq);
1074 free_iv:
1075         kfree(ctx->tx.iv);
1076 free_offload_ctx:
1077         kfree(offload_ctx);
1078         ctx->priv_ctx_tx = NULL;
1079 free_marker_record:
1080         kfree(start_marker_record);
1081         return rc;
1082 }
1083
1084 int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
1085 {
1086         struct tls12_crypto_info_aes_gcm_128 *info;
1087         struct tls_offload_context_rx *context;
1088         struct net_device *netdev;
1089         int rc = 0;
1090
1091         if (ctx->crypto_recv.info.version != TLS_1_2_VERSION)
1092                 return -EOPNOTSUPP;
1093
1094         netdev = get_netdev_for_sock(sk);
1095         if (!netdev) {
1096                 pr_err_ratelimited("%s: netdev not found\n", __func__);
1097                 return -EINVAL;
1098         }
1099
1100         if (!(netdev->features & NETIF_F_HW_TLS_RX)) {
1101                 rc = -EOPNOTSUPP;
1102                 goto release_netdev;
1103         }
1104
1105         /* Avoid offloading if the device is down
1106          * We don't want to offload new flows after
1107          * the NETDEV_DOWN event
1108          *
1109          * device_offload_lock is taken in tls_devices's NETDEV_DOWN
1110          * handler thus protecting from the device going down before
1111          * ctx was added to tls_device_list.
1112          */
1113         down_read(&device_offload_lock);
1114         if (!(netdev->flags & IFF_UP)) {
1115                 rc = -EINVAL;
1116                 goto release_lock;
1117         }
1118
1119         context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL);
1120         if (!context) {
1121                 rc = -ENOMEM;
1122                 goto release_lock;
1123         }
1124         context->resync_nh_reset = 1;
1125
1126         ctx->priv_ctx_rx = context;
1127         rc = tls_set_sw_offload(sk, ctx, 0);
1128         if (rc)
1129                 goto release_ctx;
1130
1131         rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX,
1132                                              &ctx->crypto_recv.info,
1133                                              tcp_sk(sk)->copied_seq);
1134         info = (void *)&ctx->crypto_recv.info;
1135         trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_RX,
1136                                      tcp_sk(sk)->copied_seq, info->rec_seq, rc);
1137         if (rc)
1138                 goto free_sw_resources;
1139
1140         tls_device_attach(ctx, sk, netdev);
1141         up_read(&device_offload_lock);
1142
1143         dev_put(netdev);
1144
1145         return 0;
1146
1147 free_sw_resources:
1148         up_read(&device_offload_lock);
1149         tls_sw_free_resources_rx(sk);
1150         down_read(&device_offload_lock);
1151 release_ctx:
1152         ctx->priv_ctx_rx = NULL;
1153 release_lock:
1154         up_read(&device_offload_lock);
1155 release_netdev:
1156         dev_put(netdev);
1157         return rc;
1158 }
1159
1160 void tls_device_offload_cleanup_rx(struct sock *sk)
1161 {
1162         struct tls_context *tls_ctx = tls_get_ctx(sk);
1163         struct net_device *netdev;
1164
1165         down_read(&device_offload_lock);
1166         netdev = tls_ctx->netdev;
1167         if (!netdev)
1168                 goto out;
1169
1170         netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx,
1171                                         TLS_OFFLOAD_CTX_DIR_RX);
1172
1173         if (tls_ctx->tx_conf != TLS_HW) {
1174                 dev_put(netdev);
1175                 tls_ctx->netdev = NULL;
1176         }
1177 out:
1178         up_read(&device_offload_lock);
1179         tls_sw_release_resources_rx(sk);
1180 }
1181
1182 static int tls_device_down(struct net_device *netdev)
1183 {
1184         struct tls_context *ctx, *tmp;
1185         unsigned long flags;
1186         LIST_HEAD(list);
1187
1188         /* Request a write lock to block new offload attempts */
1189         down_write(&device_offload_lock);
1190
1191         spin_lock_irqsave(&tls_device_lock, flags);
1192         list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) {
1193                 if (ctx->netdev != netdev ||
1194                     !refcount_inc_not_zero(&ctx->refcount))
1195                         continue;
1196
1197                 list_move(&ctx->list, &list);
1198         }
1199         spin_unlock_irqrestore(&tls_device_lock, flags);
1200
1201         list_for_each_entry_safe(ctx, tmp, &list, list) {
1202                 if (ctx->tx_conf == TLS_HW)
1203                         netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
1204                                                         TLS_OFFLOAD_CTX_DIR_TX);
1205                 if (ctx->rx_conf == TLS_HW)
1206                         netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
1207                                                         TLS_OFFLOAD_CTX_DIR_RX);
1208                 WRITE_ONCE(ctx->netdev, NULL);
1209                 smp_mb__before_atomic(); /* pairs with test_and_set_bit() */
1210                 while (test_bit(TLS_RX_SYNC_RUNNING, &ctx->flags))
1211                         usleep_range(10, 200);
1212                 dev_put(netdev);
1213                 list_del_init(&ctx->list);
1214
1215                 if (refcount_dec_and_test(&ctx->refcount))
1216                         tls_device_free_ctx(ctx);
1217         }
1218
1219         up_write(&device_offload_lock);
1220
1221         flush_work(&tls_device_gc_work);
1222
1223         return NOTIFY_DONE;
1224 }
1225
1226 static int tls_dev_event(struct notifier_block *this, unsigned long event,
1227                          void *ptr)
1228 {
1229         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1230
1231         if (!dev->tlsdev_ops &&
1232             !(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX)))
1233                 return NOTIFY_DONE;
1234
1235         switch (event) {
1236         case NETDEV_REGISTER:
1237         case NETDEV_FEAT_CHANGE:
1238                 if ((dev->features & NETIF_F_HW_TLS_RX) &&
1239                     !dev->tlsdev_ops->tls_dev_resync)
1240                         return NOTIFY_BAD;
1241
1242                 if  (dev->tlsdev_ops &&
1243                      dev->tlsdev_ops->tls_dev_add &&
1244                      dev->tlsdev_ops->tls_dev_del)
1245                         return NOTIFY_DONE;
1246                 else
1247                         return NOTIFY_BAD;
1248         case NETDEV_DOWN:
1249                 return tls_device_down(dev);
1250         }
1251         return NOTIFY_DONE;
1252 }
1253
1254 static struct notifier_block tls_dev_notifier = {
1255         .notifier_call  = tls_dev_event,
1256 };
1257
1258 void __init tls_device_init(void)
1259 {
1260         register_netdevice_notifier(&tls_dev_notifier);
1261 }
1262
1263 void __exit tls_device_cleanup(void)
1264 {
1265         unregister_netdevice_notifier(&tls_dev_notifier);
1266         flush_work(&tls_device_gc_work);
1267         clean_acked_data_flush();
1268 }