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 LIST_HEAD(tls_device_down_list); 54 static DEFINE_SPINLOCK(tls_device_lock); 55 56 static void tls_device_free_ctx(struct tls_context *ctx) 57 { 58 if (ctx->tx_conf == TLS_HW) { 59 kfree(tls_offload_ctx_tx(ctx)); 60 kfree(ctx->tx.rec_seq); 61 kfree(ctx->tx.iv); 62 } 63 64 if (ctx->rx_conf == TLS_HW) 65 kfree(tls_offload_ctx_rx(ctx)); 66 67 tls_ctx_free(NULL, ctx); 68 } 69 70 static void tls_device_gc_task(struct work_struct *work) 71 { 72 struct tls_context *ctx, *tmp; 73 unsigned long flags; 74 LIST_HEAD(gc_list); 75 76 spin_lock_irqsave(&tls_device_lock, flags); 77 list_splice_init(&tls_device_gc_list, &gc_list); 78 spin_unlock_irqrestore(&tls_device_lock, flags); 79 80 list_for_each_entry_safe(ctx, tmp, &gc_list, list) { 81 struct net_device *netdev = ctx->netdev; 82 83 if (netdev && ctx->tx_conf == TLS_HW) { 84 netdev->tlsdev_ops->tls_dev_del(netdev, ctx, 85 TLS_OFFLOAD_CTX_DIR_TX); 86 dev_put(netdev); 87 ctx->netdev = NULL; 88 } 89 90 list_del(&ctx->list); 91 tls_device_free_ctx(ctx); 92 } 93 } 94 95 static void tls_device_queue_ctx_destruction(struct tls_context *ctx) 96 { 97 unsigned long flags; 98 99 spin_lock_irqsave(&tls_device_lock, flags); 100 list_move_tail(&ctx->list, &tls_device_gc_list); 101 102 /* schedule_work inside the spinlock 103 * to make sure tls_device_down waits for that work. 104 */ 105 schedule_work(&tls_device_gc_work); 106 107 spin_unlock_irqrestore(&tls_device_lock, flags); 108 } 109 110 /* We assume that the socket is already connected */ 111 static struct net_device *get_netdev_for_sock(struct sock *sk) 112 { 113 struct dst_entry *dst = sk_dst_get(sk); 114 struct net_device *netdev = NULL; 115 116 if (likely(dst)) { 117 netdev = netdev_sk_get_lowest_dev(dst->dev, sk); 118 dev_hold(netdev); 119 } 120 121 dst_release(dst); 122 123 return netdev; 124 } 125 126 static void destroy_record(struct tls_record_info *record) 127 { 128 int i; 129 130 for (i = 0; i < record->num_frags; i++) 131 __skb_frag_unref(&record->frags[i], false); 132 kfree(record); 133 } 134 135 static void delete_all_records(struct tls_offload_context_tx *offload_ctx) 136 { 137 struct tls_record_info *info, *temp; 138 139 list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) { 140 list_del(&info->list); 141 destroy_record(info); 142 } 143 144 offload_ctx->retransmit_hint = NULL; 145 } 146 147 static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq) 148 { 149 struct tls_context *tls_ctx = tls_get_ctx(sk); 150 struct tls_record_info *info, *temp; 151 struct tls_offload_context_tx *ctx; 152 u64 deleted_records = 0; 153 unsigned long flags; 154 155 if (!tls_ctx) 156 return; 157 158 ctx = tls_offload_ctx_tx(tls_ctx); 159 160 spin_lock_irqsave(&ctx->lock, flags); 161 info = ctx->retransmit_hint; 162 if (info && !before(acked_seq, info->end_seq)) 163 ctx->retransmit_hint = NULL; 164 165 list_for_each_entry_safe(info, temp, &ctx->records_list, list) { 166 if (before(acked_seq, info->end_seq)) 167 break; 168 list_del(&info->list); 169 170 destroy_record(info); 171 deleted_records++; 172 } 173 174 ctx->unacked_record_sn += deleted_records; 175 spin_unlock_irqrestore(&ctx->lock, flags); 176 } 177 178 /* At this point, there should be no references on this 179 * socket and no in-flight SKBs associated with this 180 * socket, so it is safe to free all the resources. 181 */ 182 void tls_device_sk_destruct(struct sock *sk) 183 { 184 struct tls_context *tls_ctx = tls_get_ctx(sk); 185 struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); 186 187 tls_ctx->sk_destruct(sk); 188 189 if (tls_ctx->tx_conf == TLS_HW) { 190 if (ctx->open_record) 191 destroy_record(ctx->open_record); 192 delete_all_records(ctx); 193 crypto_free_aead(ctx->aead_send); 194 clean_acked_data_disable(inet_csk(sk)); 195 } 196 197 if (refcount_dec_and_test(&tls_ctx->refcount)) 198 tls_device_queue_ctx_destruction(tls_ctx); 199 } 200 EXPORT_SYMBOL_GPL(tls_device_sk_destruct); 201 202 void tls_device_free_resources_tx(struct sock *sk) 203 { 204 struct tls_context *tls_ctx = tls_get_ctx(sk); 205 206 tls_free_partial_record(sk, tls_ctx); 207 } 208 209 void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq) 210 { 211 struct tls_context *tls_ctx = tls_get_ctx(sk); 212 213 trace_tls_device_tx_resync_req(sk, got_seq, exp_seq); 214 WARN_ON(test_and_set_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags)); 215 } 216 EXPORT_SYMBOL_GPL(tls_offload_tx_resync_request); 217 218 static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx, 219 u32 seq) 220 { 221 struct net_device *netdev; 222 struct sk_buff *skb; 223 int err = 0; 224 u8 *rcd_sn; 225 226 skb = tcp_write_queue_tail(sk); 227 if (skb) 228 TCP_SKB_CB(skb)->eor = 1; 229 230 rcd_sn = tls_ctx->tx.rec_seq; 231 232 trace_tls_device_tx_resync_send(sk, seq, rcd_sn); 233 down_read(&device_offload_lock); 234 netdev = tls_ctx->netdev; 235 if (netdev) 236 err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, 237 rcd_sn, 238 TLS_OFFLOAD_CTX_DIR_TX); 239 up_read(&device_offload_lock); 240 if (err) 241 return; 242 243 clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags); 244 } 245 246 static void tls_append_frag(struct tls_record_info *record, 247 struct page_frag *pfrag, 248 int size) 249 { 250 skb_frag_t *frag; 251 252 frag = &record->frags[record->num_frags - 1]; 253 if (skb_frag_page(frag) == pfrag->page && 254 skb_frag_off(frag) + skb_frag_size(frag) == pfrag->offset) { 255 skb_frag_size_add(frag, size); 256 } else { 257 ++frag; 258 __skb_frag_set_page(frag, pfrag->page); 259 skb_frag_off_set(frag, pfrag->offset); 260 skb_frag_size_set(frag, size); 261 ++record->num_frags; 262 get_page(pfrag->page); 263 } 264 265 pfrag->offset += size; 266 record->len += size; 267 } 268 269 static int tls_push_record(struct sock *sk, 270 struct tls_context *ctx, 271 struct tls_offload_context_tx *offload_ctx, 272 struct tls_record_info *record, 273 int flags) 274 { 275 struct tls_prot_info *prot = &ctx->prot_info; 276 struct tcp_sock *tp = tcp_sk(sk); 277 skb_frag_t *frag; 278 int i; 279 280 record->end_seq = tp->write_seq + record->len; 281 list_add_tail_rcu(&record->list, &offload_ctx->records_list); 282 offload_ctx->open_record = NULL; 283 284 if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags)) 285 tls_device_resync_tx(sk, ctx, tp->write_seq); 286 287 tls_advance_record_sn(sk, prot, &ctx->tx); 288 289 for (i = 0; i < record->num_frags; i++) { 290 frag = &record->frags[i]; 291 sg_unmark_end(&offload_ctx->sg_tx_data[i]); 292 sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag), 293 skb_frag_size(frag), skb_frag_off(frag)); 294 sk_mem_charge(sk, skb_frag_size(frag)); 295 get_page(skb_frag_page(frag)); 296 } 297 sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]); 298 299 /* all ready, send */ 300 return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags); 301 } 302 303 static int tls_device_record_close(struct sock *sk, 304 struct tls_context *ctx, 305 struct tls_record_info *record, 306 struct page_frag *pfrag, 307 unsigned char record_type) 308 { 309 struct tls_prot_info *prot = &ctx->prot_info; 310 int ret; 311 312 /* append tag 313 * device will fill in the tag, we just need to append a placeholder 314 * use socket memory to improve coalescing (re-using a single buffer 315 * increases frag count) 316 * if we can't allocate memory now, steal some back from data 317 */ 318 if (likely(skb_page_frag_refill(prot->tag_size, pfrag, 319 sk->sk_allocation))) { 320 ret = 0; 321 tls_append_frag(record, pfrag, prot->tag_size); 322 } else { 323 ret = prot->tag_size; 324 if (record->len <= prot->overhead_size) 325 return -ENOMEM; 326 } 327 328 /* fill prepend */ 329 tls_fill_prepend(ctx, skb_frag_address(&record->frags[0]), 330 record->len - prot->overhead_size, 331 record_type); 332 return ret; 333 } 334 335 static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx, 336 struct page_frag *pfrag, 337 size_t prepend_size) 338 { 339 struct tls_record_info *record; 340 skb_frag_t *frag; 341 342 record = kmalloc(sizeof(*record), GFP_KERNEL); 343 if (!record) 344 return -ENOMEM; 345 346 frag = &record->frags[0]; 347 __skb_frag_set_page(frag, pfrag->page); 348 skb_frag_off_set(frag, pfrag->offset); 349 skb_frag_size_set(frag, prepend_size); 350 351 get_page(pfrag->page); 352 pfrag->offset += prepend_size; 353 354 record->num_frags = 1; 355 record->len = prepend_size; 356 offload_ctx->open_record = record; 357 return 0; 358 } 359 360 static int tls_do_allocation(struct sock *sk, 361 struct tls_offload_context_tx *offload_ctx, 362 struct page_frag *pfrag, 363 size_t prepend_size) 364 { 365 int ret; 366 367 if (!offload_ctx->open_record) { 368 if (unlikely(!skb_page_frag_refill(prepend_size, pfrag, 369 sk->sk_allocation))) { 370 READ_ONCE(sk->sk_prot)->enter_memory_pressure(sk); 371 sk_stream_moderate_sndbuf(sk); 372 return -ENOMEM; 373 } 374 375 ret = tls_create_new_record(offload_ctx, pfrag, prepend_size); 376 if (ret) 377 return ret; 378 379 if (pfrag->size > pfrag->offset) 380 return 0; 381 } 382 383 if (!sk_page_frag_refill(sk, pfrag)) 384 return -ENOMEM; 385 386 return 0; 387 } 388 389 static int tls_device_copy_data(void *addr, size_t bytes, struct iov_iter *i) 390 { 391 size_t pre_copy, nocache; 392 393 pre_copy = ~((unsigned long)addr - 1) & (SMP_CACHE_BYTES - 1); 394 if (pre_copy) { 395 pre_copy = min(pre_copy, bytes); 396 if (copy_from_iter(addr, pre_copy, i) != pre_copy) 397 return -EFAULT; 398 bytes -= pre_copy; 399 addr += pre_copy; 400 } 401 402 nocache = round_down(bytes, SMP_CACHE_BYTES); 403 if (copy_from_iter_nocache(addr, nocache, i) != nocache) 404 return -EFAULT; 405 bytes -= nocache; 406 addr += nocache; 407 408 if (bytes && copy_from_iter(addr, bytes, i) != bytes) 409 return -EFAULT; 410 411 return 0; 412 } 413 414 static int tls_push_data(struct sock *sk, 415 struct iov_iter *msg_iter, 416 size_t size, int flags, 417 unsigned char record_type) 418 { 419 struct tls_context *tls_ctx = tls_get_ctx(sk); 420 struct tls_prot_info *prot = &tls_ctx->prot_info; 421 struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); 422 struct tls_record_info *record; 423 int tls_push_record_flags; 424 struct page_frag *pfrag; 425 size_t orig_size = size; 426 u32 max_open_record_len; 427 bool more = false; 428 bool done = false; 429 int copy, rc = 0; 430 long timeo; 431 432 if (flags & 433 ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST)) 434 return -EOPNOTSUPP; 435 436 if (unlikely(sk->sk_err)) 437 return -sk->sk_err; 438 439 flags |= MSG_SENDPAGE_DECRYPTED; 440 tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST; 441 442 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); 443 if (tls_is_partially_sent_record(tls_ctx)) { 444 rc = tls_push_partial_record(sk, tls_ctx, flags); 445 if (rc < 0) 446 return rc; 447 } 448 449 pfrag = sk_page_frag(sk); 450 451 /* TLS_HEADER_SIZE is not counted as part of the TLS record, and 452 * we need to leave room for an authentication tag. 453 */ 454 max_open_record_len = TLS_MAX_PAYLOAD_SIZE + 455 prot->prepend_size; 456 do { 457 rc = tls_do_allocation(sk, ctx, pfrag, prot->prepend_size); 458 if (unlikely(rc)) { 459 rc = sk_stream_wait_memory(sk, &timeo); 460 if (!rc) 461 continue; 462 463 record = ctx->open_record; 464 if (!record) 465 break; 466 handle_error: 467 if (record_type != TLS_RECORD_TYPE_DATA) { 468 /* avoid sending partial 469 * record with type != 470 * application_data 471 */ 472 size = orig_size; 473 destroy_record(record); 474 ctx->open_record = NULL; 475 } else if (record->len > prot->prepend_size) { 476 goto last_record; 477 } 478 479 break; 480 } 481 482 record = ctx->open_record; 483 copy = min_t(size_t, size, (pfrag->size - pfrag->offset)); 484 copy = min_t(size_t, copy, (max_open_record_len - record->len)); 485 486 rc = tls_device_copy_data(page_address(pfrag->page) + 487 pfrag->offset, copy, msg_iter); 488 if (rc) 489 goto handle_error; 490 tls_append_frag(record, pfrag, copy); 491 492 size -= copy; 493 if (!size) { 494 last_record: 495 tls_push_record_flags = flags; 496 if (flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE)) { 497 more = true; 498 break; 499 } 500 501 done = true; 502 } 503 504 if (done || record->len >= max_open_record_len || 505 (record->num_frags >= MAX_SKB_FRAGS - 1)) { 506 rc = tls_device_record_close(sk, tls_ctx, record, 507 pfrag, record_type); 508 if (rc) { 509 if (rc > 0) { 510 size += rc; 511 } else { 512 size = orig_size; 513 destroy_record(record); 514 ctx->open_record = NULL; 515 break; 516 } 517 } 518 519 rc = tls_push_record(sk, 520 tls_ctx, 521 ctx, 522 record, 523 tls_push_record_flags); 524 if (rc < 0) 525 break; 526 } 527 } while (!done); 528 529 tls_ctx->pending_open_record_frags = more; 530 531 if (orig_size - size > 0) 532 rc = orig_size - size; 533 534 return rc; 535 } 536 537 int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) 538 { 539 unsigned char record_type = TLS_RECORD_TYPE_DATA; 540 struct tls_context *tls_ctx = tls_get_ctx(sk); 541 int rc; 542 543 mutex_lock(&tls_ctx->tx_lock); 544 lock_sock(sk); 545 546 if (unlikely(msg->msg_controllen)) { 547 rc = tls_proccess_cmsg(sk, msg, &record_type); 548 if (rc) 549 goto out; 550 } 551 552 rc = tls_push_data(sk, &msg->msg_iter, size, 553 msg->msg_flags, record_type); 554 555 out: 556 release_sock(sk); 557 mutex_unlock(&tls_ctx->tx_lock); 558 return rc; 559 } 560 561 int tls_device_sendpage(struct sock *sk, struct page *page, 562 int offset, size_t size, int flags) 563 { 564 struct tls_context *tls_ctx = tls_get_ctx(sk); 565 struct iov_iter msg_iter; 566 char *kaddr; 567 struct kvec iov; 568 int rc; 569 570 if (flags & MSG_SENDPAGE_NOTLAST) 571 flags |= MSG_MORE; 572 573 mutex_lock(&tls_ctx->tx_lock); 574 lock_sock(sk); 575 576 if (flags & MSG_OOB) { 577 rc = -EOPNOTSUPP; 578 goto out; 579 } 580 581 kaddr = kmap(page); 582 iov.iov_base = kaddr + offset; 583 iov.iov_len = size; 584 iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size); 585 rc = tls_push_data(sk, &msg_iter, size, 586 flags, TLS_RECORD_TYPE_DATA); 587 kunmap(page); 588 589 out: 590 release_sock(sk); 591 mutex_unlock(&tls_ctx->tx_lock); 592 return rc; 593 } 594 595 struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context, 596 u32 seq, u64 *p_record_sn) 597 { 598 u64 record_sn = context->hint_record_sn; 599 struct tls_record_info *info, *last; 600 601 info = context->retransmit_hint; 602 if (!info || 603 before(seq, info->end_seq - info->len)) { 604 /* if retransmit_hint is irrelevant start 605 * from the beginning of the list 606 */ 607 info = list_first_entry_or_null(&context->records_list, 608 struct tls_record_info, list); 609 if (!info) 610 return NULL; 611 /* send the start_marker record if seq number is before the 612 * tls offload start marker sequence number. This record is 613 * required to handle TCP packets which are before TLS offload 614 * started. 615 * And if it's not start marker, look if this seq number 616 * belongs to the list. 617 */ 618 if (likely(!tls_record_is_start_marker(info))) { 619 /* we have the first record, get the last record to see 620 * if this seq number belongs to the list. 621 */ 622 last = list_last_entry(&context->records_list, 623 struct tls_record_info, list); 624 625 if (!between(seq, tls_record_start_seq(info), 626 last->end_seq)) 627 return NULL; 628 } 629 record_sn = context->unacked_record_sn; 630 } 631 632 /* We just need the _rcu for the READ_ONCE() */ 633 rcu_read_lock(); 634 list_for_each_entry_from_rcu(info, &context->records_list, list) { 635 if (before(seq, info->end_seq)) { 636 if (!context->retransmit_hint || 637 after(info->end_seq, 638 context->retransmit_hint->end_seq)) { 639 context->hint_record_sn = record_sn; 640 context->retransmit_hint = info; 641 } 642 *p_record_sn = record_sn; 643 goto exit_rcu_unlock; 644 } 645 record_sn++; 646 } 647 info = NULL; 648 649 exit_rcu_unlock: 650 rcu_read_unlock(); 651 return info; 652 } 653 EXPORT_SYMBOL(tls_get_record); 654 655 static int tls_device_push_pending_record(struct sock *sk, int flags) 656 { 657 struct iov_iter msg_iter; 658 659 iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0); 660 return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA); 661 } 662 663 void tls_device_write_space(struct sock *sk, struct tls_context *ctx) 664 { 665 if (tls_is_partially_sent_record(ctx)) { 666 gfp_t sk_allocation = sk->sk_allocation; 667 668 WARN_ON_ONCE(sk->sk_write_pending); 669 670 sk->sk_allocation = GFP_ATOMIC; 671 tls_push_partial_record(sk, ctx, 672 MSG_DONTWAIT | MSG_NOSIGNAL | 673 MSG_SENDPAGE_DECRYPTED); 674 sk->sk_allocation = sk_allocation; 675 } 676 } 677 678 static void tls_device_resync_rx(struct tls_context *tls_ctx, 679 struct sock *sk, u32 seq, u8 *rcd_sn) 680 { 681 struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx); 682 struct net_device *netdev; 683 684 trace_tls_device_rx_resync_send(sk, seq, rcd_sn, rx_ctx->resync_type); 685 rcu_read_lock(); 686 netdev = READ_ONCE(tls_ctx->netdev); 687 if (netdev) 688 netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn, 689 TLS_OFFLOAD_CTX_DIR_RX); 690 rcu_read_unlock(); 691 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICERESYNC); 692 } 693 694 static bool 695 tls_device_rx_resync_async(struct tls_offload_resync_async *resync_async, 696 s64 resync_req, u32 *seq, u16 *rcd_delta) 697 { 698 u32 is_async = resync_req & RESYNC_REQ_ASYNC; 699 u32 req_seq = resync_req >> 32; 700 u32 req_end = req_seq + ((resync_req >> 16) & 0xffff); 701 u16 i; 702 703 *rcd_delta = 0; 704 705 if (is_async) { 706 /* shouldn't get to wraparound: 707 * too long in async stage, something bad happened 708 */ 709 if (WARN_ON_ONCE(resync_async->rcd_delta == USHRT_MAX)) 710 return false; 711 712 /* asynchronous stage: log all headers seq such that 713 * req_seq <= seq <= end_seq, and wait for real resync request 714 */ 715 if (before(*seq, req_seq)) 716 return false; 717 if (!after(*seq, req_end) && 718 resync_async->loglen < TLS_DEVICE_RESYNC_ASYNC_LOGMAX) 719 resync_async->log[resync_async->loglen++] = *seq; 720 721 resync_async->rcd_delta++; 722 723 return false; 724 } 725 726 /* synchronous stage: check against the logged entries and 727 * proceed to check the next entries if no match was found 728 */ 729 for (i = 0; i < resync_async->loglen; i++) 730 if (req_seq == resync_async->log[i] && 731 atomic64_try_cmpxchg(&resync_async->req, &resync_req, 0)) { 732 *rcd_delta = resync_async->rcd_delta - i; 733 *seq = req_seq; 734 resync_async->loglen = 0; 735 resync_async->rcd_delta = 0; 736 return true; 737 } 738 739 resync_async->loglen = 0; 740 resync_async->rcd_delta = 0; 741 742 if (req_seq == *seq && 743 atomic64_try_cmpxchg(&resync_async->req, 744 &resync_req, 0)) 745 return true; 746 747 return false; 748 } 749 750 void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) 751 { 752 struct tls_context *tls_ctx = tls_get_ctx(sk); 753 struct tls_offload_context_rx *rx_ctx; 754 u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; 755 u32 sock_data, is_req_pending; 756 struct tls_prot_info *prot; 757 s64 resync_req; 758 u16 rcd_delta; 759 u32 req_seq; 760 761 if (tls_ctx->rx_conf != TLS_HW) 762 return; 763 if (unlikely(test_bit(TLS_RX_DEV_DEGRADED, &tls_ctx->flags))) 764 return; 765 766 prot = &tls_ctx->prot_info; 767 rx_ctx = tls_offload_ctx_rx(tls_ctx); 768 memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); 769 770 switch (rx_ctx->resync_type) { 771 case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ: 772 resync_req = atomic64_read(&rx_ctx->resync_req); 773 req_seq = resync_req >> 32; 774 seq += TLS_HEADER_SIZE - 1; 775 is_req_pending = resync_req; 776 777 if (likely(!is_req_pending) || req_seq != seq || 778 !atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0)) 779 return; 780 break; 781 case TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT: 782 if (likely(!rx_ctx->resync_nh_do_now)) 783 return; 784 785 /* head of next rec is already in, note that the sock_inq will 786 * include the currently parsed message when called from parser 787 */ 788 sock_data = tcp_inq(sk); 789 if (sock_data > rcd_len) { 790 trace_tls_device_rx_resync_nh_delay(sk, sock_data, 791 rcd_len); 792 return; 793 } 794 795 rx_ctx->resync_nh_do_now = 0; 796 seq += rcd_len; 797 tls_bigint_increment(rcd_sn, prot->rec_seq_size); 798 break; 799 case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ_ASYNC: 800 resync_req = atomic64_read(&rx_ctx->resync_async->req); 801 is_req_pending = resync_req; 802 if (likely(!is_req_pending)) 803 return; 804 805 if (!tls_device_rx_resync_async(rx_ctx->resync_async, 806 resync_req, &seq, &rcd_delta)) 807 return; 808 tls_bigint_subtract(rcd_sn, rcd_delta); 809 break; 810 } 811 812 tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn); 813 } 814 815 static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx, 816 struct tls_offload_context_rx *ctx, 817 struct sock *sk, struct sk_buff *skb) 818 { 819 struct strp_msg *rxm; 820 821 /* device will request resyncs by itself based on stream scan */ 822 if (ctx->resync_type != TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT) 823 return; 824 /* already scheduled */ 825 if (ctx->resync_nh_do_now) 826 return; 827 /* seen decrypted fragments since last fully-failed record */ 828 if (ctx->resync_nh_reset) { 829 ctx->resync_nh_reset = 0; 830 ctx->resync_nh.decrypted_failed = 1; 831 ctx->resync_nh.decrypted_tgt = TLS_DEVICE_RESYNC_NH_START_IVAL; 832 return; 833 } 834 835 if (++ctx->resync_nh.decrypted_failed <= ctx->resync_nh.decrypted_tgt) 836 return; 837 838 /* doing resync, bump the next target in case it fails */ 839 if (ctx->resync_nh.decrypted_tgt < TLS_DEVICE_RESYNC_NH_MAX_IVAL) 840 ctx->resync_nh.decrypted_tgt *= 2; 841 else 842 ctx->resync_nh.decrypted_tgt += TLS_DEVICE_RESYNC_NH_MAX_IVAL; 843 844 rxm = strp_msg(skb); 845 846 /* head of next rec is already in, parser will sync for us */ 847 if (tcp_inq(sk) > rxm->full_len) { 848 trace_tls_device_rx_resync_nh_schedule(sk); 849 ctx->resync_nh_do_now = 1; 850 } else { 851 struct tls_prot_info *prot = &tls_ctx->prot_info; 852 u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; 853 854 memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); 855 tls_bigint_increment(rcd_sn, prot->rec_seq_size); 856 857 tls_device_resync_rx(tls_ctx, sk, tcp_sk(sk)->copied_seq, 858 rcd_sn); 859 } 860 } 861 862 static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb) 863 { 864 struct strp_msg *rxm = strp_msg(skb); 865 int err = 0, offset = rxm->offset, copy, nsg, data_len, pos; 866 struct sk_buff *skb_iter, *unused; 867 struct scatterlist sg[1]; 868 char *orig_buf, *buf; 869 870 orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE + 871 TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation); 872 if (!orig_buf) 873 return -ENOMEM; 874 buf = orig_buf; 875 876 nsg = skb_cow_data(skb, 0, &unused); 877 if (unlikely(nsg < 0)) { 878 err = nsg; 879 goto free_buf; 880 } 881 882 sg_init_table(sg, 1); 883 sg_set_buf(&sg[0], buf, 884 rxm->full_len + TLS_HEADER_SIZE + 885 TLS_CIPHER_AES_GCM_128_IV_SIZE); 886 err = skb_copy_bits(skb, offset, buf, 887 TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE); 888 if (err) 889 goto free_buf; 890 891 /* We are interested only in the decrypted data not the auth */ 892 err = decrypt_skb(sk, skb, sg); 893 if (err != -EBADMSG) 894 goto free_buf; 895 else 896 err = 0; 897 898 data_len = rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE; 899 900 if (skb_pagelen(skb) > offset) { 901 copy = min_t(int, skb_pagelen(skb) - offset, data_len); 902 903 if (skb->decrypted) { 904 err = skb_store_bits(skb, offset, buf, copy); 905 if (err) 906 goto free_buf; 907 } 908 909 offset += copy; 910 buf += copy; 911 } 912 913 pos = skb_pagelen(skb); 914 skb_walk_frags(skb, skb_iter) { 915 int frag_pos; 916 917 /* Practically all frags must belong to msg if reencrypt 918 * is needed with current strparser and coalescing logic, 919 * but strparser may "get optimized", so let's be safe. 920 */ 921 if (pos + skb_iter->len <= offset) 922 goto done_with_frag; 923 if (pos >= data_len + rxm->offset) 924 break; 925 926 frag_pos = offset - pos; 927 copy = min_t(int, skb_iter->len - frag_pos, 928 data_len + rxm->offset - offset); 929 930 if (skb_iter->decrypted) { 931 err = skb_store_bits(skb_iter, frag_pos, buf, copy); 932 if (err) 933 goto free_buf; 934 } 935 936 offset += copy; 937 buf += copy; 938 done_with_frag: 939 pos += skb_iter->len; 940 } 941 942 free_buf: 943 kfree(orig_buf); 944 return err; 945 } 946 947 int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx, 948 struct sk_buff *skb, struct strp_msg *rxm) 949 { 950 struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx); 951 int is_decrypted = skb->decrypted; 952 int is_encrypted = !is_decrypted; 953 struct sk_buff *skb_iter; 954 955 /* Check if all the data is decrypted already */ 956 skb_walk_frags(skb, skb_iter) { 957 is_decrypted &= skb_iter->decrypted; 958 is_encrypted &= !skb_iter->decrypted; 959 } 960 961 trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len, 962 tls_ctx->rx.rec_seq, rxm->full_len, 963 is_encrypted, is_decrypted); 964 965 ctx->sw.decrypted |= is_decrypted; 966 967 if (unlikely(test_bit(TLS_RX_DEV_DEGRADED, &tls_ctx->flags))) { 968 if (likely(is_encrypted || is_decrypted)) 969 return 0; 970 971 /* After tls_device_down disables the offload, the next SKB will 972 * likely have initial fragments decrypted, and final ones not 973 * decrypted. We need to reencrypt that single SKB. 974 */ 975 return tls_device_reencrypt(sk, skb); 976 } 977 978 /* Return immediately if the record is either entirely plaintext or 979 * entirely ciphertext. Otherwise handle reencrypt partially decrypted 980 * record. 981 */ 982 if (is_decrypted) { 983 ctx->resync_nh_reset = 1; 984 return 0; 985 } 986 if (is_encrypted) { 987 tls_device_core_ctrl_rx_resync(tls_ctx, ctx, sk, skb); 988 return 0; 989 } 990 991 ctx->resync_nh_reset = 1; 992 return tls_device_reencrypt(sk, skb); 993 } 994 995 static void tls_device_attach(struct tls_context *ctx, struct sock *sk, 996 struct net_device *netdev) 997 { 998 if (sk->sk_destruct != tls_device_sk_destruct) { 999 refcount_set(&ctx->refcount, 1); 1000 dev_hold(netdev); 1001 ctx->netdev = netdev; 1002 spin_lock_irq(&tls_device_lock); 1003 list_add_tail(&ctx->list, &tls_device_list); 1004 spin_unlock_irq(&tls_device_lock); 1005 1006 ctx->sk_destruct = sk->sk_destruct; 1007 smp_store_release(&sk->sk_destruct, tls_device_sk_destruct); 1008 } 1009 } 1010 1011 int tls_set_device_offload(struct sock *sk, struct tls_context *ctx) 1012 { 1013 u16 nonce_size, tag_size, iv_size, rec_seq_size, salt_size; 1014 struct tls_context *tls_ctx = tls_get_ctx(sk); 1015 struct tls_prot_info *prot = &tls_ctx->prot_info; 1016 struct tls_record_info *start_marker_record; 1017 struct tls_offload_context_tx *offload_ctx; 1018 struct tls_crypto_info *crypto_info; 1019 struct net_device *netdev; 1020 char *iv, *rec_seq; 1021 struct sk_buff *skb; 1022 __be64 rcd_sn; 1023 int rc; 1024 1025 if (!ctx) 1026 return -EINVAL; 1027 1028 if (ctx->priv_ctx_tx) 1029 return -EEXIST; 1030 1031 start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL); 1032 if (!start_marker_record) 1033 return -ENOMEM; 1034 1035 offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL); 1036 if (!offload_ctx) { 1037 rc = -ENOMEM; 1038 goto free_marker_record; 1039 } 1040 1041 crypto_info = &ctx->crypto_send.info; 1042 if (crypto_info->version != TLS_1_2_VERSION) { 1043 rc = -EOPNOTSUPP; 1044 goto free_offload_ctx; 1045 } 1046 1047 switch (crypto_info->cipher_type) { 1048 case TLS_CIPHER_AES_GCM_128: 1049 nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; 1050 tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE; 1051 iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE; 1052 iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; 1053 rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE; 1054 salt_size = TLS_CIPHER_AES_GCM_128_SALT_SIZE; 1055 rec_seq = 1056 ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq; 1057 break; 1058 default: 1059 rc = -EINVAL; 1060 goto free_offload_ctx; 1061 } 1062 1063 /* Sanity-check the rec_seq_size for stack allocations */ 1064 if (rec_seq_size > TLS_MAX_REC_SEQ_SIZE) { 1065 rc = -EINVAL; 1066 goto free_offload_ctx; 1067 } 1068 1069 prot->version = crypto_info->version; 1070 prot->cipher_type = crypto_info->cipher_type; 1071 prot->prepend_size = TLS_HEADER_SIZE + nonce_size; 1072 prot->tag_size = tag_size; 1073 prot->overhead_size = prot->prepend_size + prot->tag_size; 1074 prot->iv_size = iv_size; 1075 prot->salt_size = salt_size; 1076 ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE, 1077 GFP_KERNEL); 1078 if (!ctx->tx.iv) { 1079 rc = -ENOMEM; 1080 goto free_offload_ctx; 1081 } 1082 1083 memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size); 1084 1085 prot->rec_seq_size = rec_seq_size; 1086 ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL); 1087 if (!ctx->tx.rec_seq) { 1088 rc = -ENOMEM; 1089 goto free_iv; 1090 } 1091 1092 rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info); 1093 if (rc) 1094 goto free_rec_seq; 1095 1096 /* start at rec_seq - 1 to account for the start marker record */ 1097 memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn)); 1098 offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1; 1099 1100 start_marker_record->end_seq = tcp_sk(sk)->write_seq; 1101 start_marker_record->len = 0; 1102 start_marker_record->num_frags = 0; 1103 1104 INIT_LIST_HEAD(&offload_ctx->records_list); 1105 list_add_tail(&start_marker_record->list, &offload_ctx->records_list); 1106 spin_lock_init(&offload_ctx->lock); 1107 sg_init_table(offload_ctx->sg_tx_data, 1108 ARRAY_SIZE(offload_ctx->sg_tx_data)); 1109 1110 clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked); 1111 ctx->push_pending_record = tls_device_push_pending_record; 1112 1113 /* TLS offload is greatly simplified if we don't send 1114 * SKBs where only part of the payload needs to be encrypted. 1115 * So mark the last skb in the write queue as end of record. 1116 */ 1117 skb = tcp_write_queue_tail(sk); 1118 if (skb) 1119 TCP_SKB_CB(skb)->eor = 1; 1120 1121 netdev = get_netdev_for_sock(sk); 1122 if (!netdev) { 1123 pr_err_ratelimited("%s: netdev not found\n", __func__); 1124 rc = -EINVAL; 1125 goto disable_cad; 1126 } 1127 1128 if (!(netdev->features & NETIF_F_HW_TLS_TX)) { 1129 rc = -EOPNOTSUPP; 1130 goto release_netdev; 1131 } 1132 1133 /* Avoid offloading if the device is down 1134 * We don't want to offload new flows after 1135 * the NETDEV_DOWN event 1136 * 1137 * device_offload_lock is taken in tls_devices's NETDEV_DOWN 1138 * handler thus protecting from the device going down before 1139 * ctx was added to tls_device_list. 1140 */ 1141 down_read(&device_offload_lock); 1142 if (!(netdev->flags & IFF_UP)) { 1143 rc = -EINVAL; 1144 goto release_lock; 1145 } 1146 1147 ctx->priv_ctx_tx = offload_ctx; 1148 rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX, 1149 &ctx->crypto_send.info, 1150 tcp_sk(sk)->write_seq); 1151 trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_TX, 1152 tcp_sk(sk)->write_seq, rec_seq, rc); 1153 if (rc) 1154 goto release_lock; 1155 1156 tls_device_attach(ctx, sk, netdev); 1157 up_read(&device_offload_lock); 1158 1159 /* following this assignment tls_is_sk_tx_device_offloaded 1160 * will return true and the context might be accessed 1161 * by the netdev's xmit function. 1162 */ 1163 smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb); 1164 dev_put(netdev); 1165 1166 return 0; 1167 1168 release_lock: 1169 up_read(&device_offload_lock); 1170 release_netdev: 1171 dev_put(netdev); 1172 disable_cad: 1173 clean_acked_data_disable(inet_csk(sk)); 1174 crypto_free_aead(offload_ctx->aead_send); 1175 free_rec_seq: 1176 kfree(ctx->tx.rec_seq); 1177 free_iv: 1178 kfree(ctx->tx.iv); 1179 free_offload_ctx: 1180 kfree(offload_ctx); 1181 ctx->priv_ctx_tx = NULL; 1182 free_marker_record: 1183 kfree(start_marker_record); 1184 return rc; 1185 } 1186 1187 int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx) 1188 { 1189 struct tls12_crypto_info_aes_gcm_128 *info; 1190 struct tls_offload_context_rx *context; 1191 struct net_device *netdev; 1192 int rc = 0; 1193 1194 if (ctx->crypto_recv.info.version != TLS_1_2_VERSION) 1195 return -EOPNOTSUPP; 1196 1197 netdev = get_netdev_for_sock(sk); 1198 if (!netdev) { 1199 pr_err_ratelimited("%s: netdev not found\n", __func__); 1200 return -EINVAL; 1201 } 1202 1203 if (!(netdev->features & NETIF_F_HW_TLS_RX)) { 1204 rc = -EOPNOTSUPP; 1205 goto release_netdev; 1206 } 1207 1208 /* Avoid offloading if the device is down 1209 * We don't want to offload new flows after 1210 * the NETDEV_DOWN event 1211 * 1212 * device_offload_lock is taken in tls_devices's NETDEV_DOWN 1213 * handler thus protecting from the device going down before 1214 * ctx was added to tls_device_list. 1215 */ 1216 down_read(&device_offload_lock); 1217 if (!(netdev->flags & IFF_UP)) { 1218 rc = -EINVAL; 1219 goto release_lock; 1220 } 1221 1222 context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL); 1223 if (!context) { 1224 rc = -ENOMEM; 1225 goto release_lock; 1226 } 1227 context->resync_nh_reset = 1; 1228 1229 ctx->priv_ctx_rx = context; 1230 rc = tls_set_sw_offload(sk, ctx, 0); 1231 if (rc) 1232 goto release_ctx; 1233 1234 rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX, 1235 &ctx->crypto_recv.info, 1236 tcp_sk(sk)->copied_seq); 1237 info = (void *)&ctx->crypto_recv.info; 1238 trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_RX, 1239 tcp_sk(sk)->copied_seq, info->rec_seq, rc); 1240 if (rc) 1241 goto free_sw_resources; 1242 1243 tls_device_attach(ctx, sk, netdev); 1244 up_read(&device_offload_lock); 1245 1246 dev_put(netdev); 1247 1248 return 0; 1249 1250 free_sw_resources: 1251 up_read(&device_offload_lock); 1252 tls_sw_free_resources_rx(sk); 1253 down_read(&device_offload_lock); 1254 release_ctx: 1255 ctx->priv_ctx_rx = NULL; 1256 release_lock: 1257 up_read(&device_offload_lock); 1258 release_netdev: 1259 dev_put(netdev); 1260 return rc; 1261 } 1262 1263 void tls_device_offload_cleanup_rx(struct sock *sk) 1264 { 1265 struct tls_context *tls_ctx = tls_get_ctx(sk); 1266 struct net_device *netdev; 1267 1268 down_read(&device_offload_lock); 1269 netdev = tls_ctx->netdev; 1270 if (!netdev) 1271 goto out; 1272 1273 netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx, 1274 TLS_OFFLOAD_CTX_DIR_RX); 1275 1276 if (tls_ctx->tx_conf != TLS_HW) { 1277 dev_put(netdev); 1278 tls_ctx->netdev = NULL; 1279 } else { 1280 set_bit(TLS_RX_DEV_CLOSED, &tls_ctx->flags); 1281 } 1282 out: 1283 up_read(&device_offload_lock); 1284 tls_sw_release_resources_rx(sk); 1285 } 1286 1287 static int tls_device_down(struct net_device *netdev) 1288 { 1289 struct tls_context *ctx, *tmp; 1290 unsigned long flags; 1291 LIST_HEAD(list); 1292 1293 /* Request a write lock to block new offload attempts */ 1294 down_write(&device_offload_lock); 1295 1296 spin_lock_irqsave(&tls_device_lock, flags); 1297 list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) { 1298 if (ctx->netdev != netdev || 1299 !refcount_inc_not_zero(&ctx->refcount)) 1300 continue; 1301 1302 list_move(&ctx->list, &list); 1303 } 1304 spin_unlock_irqrestore(&tls_device_lock, flags); 1305 1306 list_for_each_entry_safe(ctx, tmp, &list, list) { 1307 /* Stop offloaded TX and switch to the fallback. 1308 * tls_is_sk_tx_device_offloaded will return false. 1309 */ 1310 WRITE_ONCE(ctx->sk->sk_validate_xmit_skb, tls_validate_xmit_skb_sw); 1311 1312 /* Stop the RX and TX resync. 1313 * tls_dev_resync must not be called after tls_dev_del. 1314 */ 1315 WRITE_ONCE(ctx->netdev, NULL); 1316 1317 /* Start skipping the RX resync logic completely. */ 1318 set_bit(TLS_RX_DEV_DEGRADED, &ctx->flags); 1319 1320 /* Sync with inflight packets. After this point: 1321 * TX: no non-encrypted packets will be passed to the driver. 1322 * RX: resync requests from the driver will be ignored. 1323 */ 1324 synchronize_net(); 1325 1326 /* Release the offload context on the driver side. */ 1327 if (ctx->tx_conf == TLS_HW) 1328 netdev->tlsdev_ops->tls_dev_del(netdev, ctx, 1329 TLS_OFFLOAD_CTX_DIR_TX); 1330 if (ctx->rx_conf == TLS_HW && 1331 !test_bit(TLS_RX_DEV_CLOSED, &ctx->flags)) 1332 netdev->tlsdev_ops->tls_dev_del(netdev, ctx, 1333 TLS_OFFLOAD_CTX_DIR_RX); 1334 1335 dev_put(netdev); 1336 1337 /* Move the context to a separate list for two reasons: 1338 * 1. When the context is deallocated, list_del is called. 1339 * 2. It's no longer an offloaded context, so we don't want to 1340 * run offload-specific code on this context. 1341 */ 1342 spin_lock_irqsave(&tls_device_lock, flags); 1343 list_move_tail(&ctx->list, &tls_device_down_list); 1344 spin_unlock_irqrestore(&tls_device_lock, flags); 1345 1346 /* Device contexts for RX and TX will be freed in on sk_destruct 1347 * by tls_device_free_ctx. rx_conf and tx_conf stay in TLS_HW. 1348 */ 1349 } 1350 1351 up_write(&device_offload_lock); 1352 1353 flush_work(&tls_device_gc_work); 1354 1355 return NOTIFY_DONE; 1356 } 1357 1358 static int tls_dev_event(struct notifier_block *this, unsigned long event, 1359 void *ptr) 1360 { 1361 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1362 1363 if (!dev->tlsdev_ops && 1364 !(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX))) 1365 return NOTIFY_DONE; 1366 1367 switch (event) { 1368 case NETDEV_REGISTER: 1369 case NETDEV_FEAT_CHANGE: 1370 if (netif_is_bond_master(dev)) 1371 return NOTIFY_DONE; 1372 if ((dev->features & NETIF_F_HW_TLS_RX) && 1373 !dev->tlsdev_ops->tls_dev_resync) 1374 return NOTIFY_BAD; 1375 1376 if (dev->tlsdev_ops && 1377 dev->tlsdev_ops->tls_dev_add && 1378 dev->tlsdev_ops->tls_dev_del) 1379 return NOTIFY_DONE; 1380 else 1381 return NOTIFY_BAD; 1382 case NETDEV_DOWN: 1383 return tls_device_down(dev); 1384 } 1385 return NOTIFY_DONE; 1386 } 1387 1388 static struct notifier_block tls_dev_notifier = { 1389 .notifier_call = tls_dev_event, 1390 }; 1391 1392 void __init tls_device_init(void) 1393 { 1394 register_netdevice_notifier(&tls_dev_notifier); 1395 } 1396 1397 void __exit tls_device_cleanup(void) 1398 { 1399 unregister_netdevice_notifier(&tls_dev_notifier); 1400 flush_work(&tls_device_gc_work); 1401 clean_acked_data_flush(); 1402 } 1403