2 * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
3 * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
4 * Copyright (c) 2016-2017, Lance Chao <lancerchao@fb.com>. All rights reserved.
5 * Copyright (c) 2016, Fridolin Pokorny <fridolin.pokorny@gmail.com>. All rights reserved.
6 * Copyright (c) 2016, Nikos Mavrogiannopoulos <nmav@gnutls.org>. All rights reserved.
7 * Copyright (c) 2018, Covalent IO, Inc. http://covalent.io
9 * This software is available to you under a choice of one of two
10 * licenses. You may choose to be licensed under the terms of the GNU
11 * General Public License (GPL) Version 2, available from the file
12 * COPYING in the main directory of this source tree, or the
13 * OpenIB.org BSD license below:
15 * Redistribution and use in source and binary forms, with or
16 * without modification, are permitted provided that the following
19 * - Redistributions of source code must retain the above
20 * copyright notice, this list of conditions and the following
23 * - Redistributions in binary form must reproduce the above
24 * copyright notice, this list of conditions and the following
25 * disclaimer in the documentation and/or other materials
26 * provided with the distribution.
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
32 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
33 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
34 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
38 #include <linux/bug.h>
39 #include <linux/sched/signal.h>
40 #include <linux/module.h>
41 #include <linux/kernel.h>
42 #include <linux/splice.h>
43 #include <crypto/aead.h>
45 #include <net/strparser.h>
47 #include <trace/events/sock.h>
51 struct tls_decrypt_arg {
61 struct tls_decrypt_ctx {
63 u8 iv[TLS_MAX_IV_SIZE];
64 u8 aad[TLS_MAX_AAD_SIZE];
66 struct scatterlist sg[];
69 noinline void tls_err_abort(struct sock *sk, int err)
71 WARN_ON_ONCE(err >= 0);
72 /* sk->sk_err should contain a positive error code. */
73 WRITE_ONCE(sk->sk_err, -err);
74 /* Paired with smp_rmb() in tcp_poll() */
79 static int __skb_nsg(struct sk_buff *skb, int offset, int len,
80 unsigned int recursion_level)
82 int start = skb_headlen(skb);
83 int i, chunk = start - offset;
84 struct sk_buff *frag_iter;
87 if (unlikely(recursion_level >= 24))
100 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
103 WARN_ON(start > offset + len);
105 end = start + skb_frag_size(&skb_shinfo(skb)->frags[i]);
106 chunk = end - offset;
119 if (unlikely(skb_has_frag_list(skb))) {
120 skb_walk_frags(skb, frag_iter) {
123 WARN_ON(start > offset + len);
125 end = start + frag_iter->len;
126 chunk = end - offset;
130 ret = __skb_nsg(frag_iter, offset - start, chunk,
131 recursion_level + 1);
132 if (unlikely(ret < 0))
147 /* Return the number of scatterlist elements required to completely map the
148 * skb, or -EMSGSIZE if the recursion depth is exceeded.
150 static int skb_nsg(struct sk_buff *skb, int offset, int len)
152 return __skb_nsg(skb, offset, len, 0);
155 static int tls_padding_length(struct tls_prot_info *prot, struct sk_buff *skb,
156 struct tls_decrypt_arg *darg)
158 struct strp_msg *rxm = strp_msg(skb);
159 struct tls_msg *tlm = tls_msg(skb);
162 /* Determine zero-padding length */
163 if (prot->version == TLS_1_3_VERSION) {
164 int offset = rxm->full_len - TLS_TAG_SIZE - 1;
165 char content_type = darg->zc ? darg->tail : 0;
168 while (content_type == 0) {
169 if (offset < prot->prepend_size)
171 err = skb_copy_bits(skb, rxm->offset + offset,
180 tlm->control = content_type;
185 static void tls_decrypt_done(void *data, int err)
187 struct aead_request *aead_req = data;
188 struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
189 struct scatterlist *sgout = aead_req->dst;
190 struct scatterlist *sgin = aead_req->src;
191 struct tls_sw_context_rx *ctx;
192 struct tls_decrypt_ctx *dctx;
193 struct tls_context *tls_ctx;
194 struct scatterlist *sg;
199 aead_size = sizeof(*aead_req) + crypto_aead_reqsize(aead);
200 aead_size = ALIGN(aead_size, __alignof__(*dctx));
201 dctx = (void *)((u8 *)aead_req + aead_size);
204 tls_ctx = tls_get_ctx(sk);
205 ctx = tls_sw_ctx_rx(tls_ctx);
207 /* Propagate if there was an err */
210 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSDECRYPTERROR);
211 ctx->async_wait.err = err;
212 tls_err_abort(sk, err);
215 /* Free the destination pages if skb was not decrypted inplace */
217 /* Skip the first S/G entry as it points to AAD */
218 for_each_sg(sg_next(sgout), sg, UINT_MAX, pages) {
221 put_page(sg_page(sg));
227 spin_lock_bh(&ctx->decrypt_compl_lock);
228 if (!atomic_dec_return(&ctx->decrypt_pending))
229 complete(&ctx->async_wait.completion);
230 spin_unlock_bh(&ctx->decrypt_compl_lock);
233 static int tls_do_decryption(struct sock *sk,
234 struct scatterlist *sgin,
235 struct scatterlist *sgout,
238 struct aead_request *aead_req,
239 struct tls_decrypt_arg *darg)
241 struct tls_context *tls_ctx = tls_get_ctx(sk);
242 struct tls_prot_info *prot = &tls_ctx->prot_info;
243 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
246 aead_request_set_tfm(aead_req, ctx->aead_recv);
247 aead_request_set_ad(aead_req, prot->aad_size);
248 aead_request_set_crypt(aead_req, sgin, sgout,
249 data_len + prot->tag_size,
253 aead_request_set_callback(aead_req,
254 CRYPTO_TFM_REQ_MAY_BACKLOG,
255 tls_decrypt_done, aead_req);
256 atomic_inc(&ctx->decrypt_pending);
258 aead_request_set_callback(aead_req,
259 CRYPTO_TFM_REQ_MAY_BACKLOG,
260 crypto_req_done, &ctx->async_wait);
263 ret = crypto_aead_decrypt(aead_req);
264 if (ret == -EINPROGRESS) {
268 ret = crypto_wait_req(ret, &ctx->async_wait);
275 static void tls_trim_both_msgs(struct sock *sk, int target_size)
277 struct tls_context *tls_ctx = tls_get_ctx(sk);
278 struct tls_prot_info *prot = &tls_ctx->prot_info;
279 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
280 struct tls_rec *rec = ctx->open_rec;
282 sk_msg_trim(sk, &rec->msg_plaintext, target_size);
284 target_size += prot->overhead_size;
285 sk_msg_trim(sk, &rec->msg_encrypted, target_size);
288 static int tls_alloc_encrypted_msg(struct sock *sk, int len)
290 struct tls_context *tls_ctx = tls_get_ctx(sk);
291 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
292 struct tls_rec *rec = ctx->open_rec;
293 struct sk_msg *msg_en = &rec->msg_encrypted;
295 return sk_msg_alloc(sk, msg_en, len, 0);
298 static int tls_clone_plaintext_msg(struct sock *sk, int required)
300 struct tls_context *tls_ctx = tls_get_ctx(sk);
301 struct tls_prot_info *prot = &tls_ctx->prot_info;
302 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
303 struct tls_rec *rec = ctx->open_rec;
304 struct sk_msg *msg_pl = &rec->msg_plaintext;
305 struct sk_msg *msg_en = &rec->msg_encrypted;
308 /* We add page references worth len bytes from encrypted sg
309 * at the end of plaintext sg. It is guaranteed that msg_en
310 * has enough required room (ensured by caller).
312 len = required - msg_pl->sg.size;
314 /* Skip initial bytes in msg_en's data to be able to use
315 * same offset of both plain and encrypted data.
317 skip = prot->prepend_size + msg_pl->sg.size;
319 return sk_msg_clone(sk, msg_pl, msg_en, skip, len);
322 static struct tls_rec *tls_get_rec(struct sock *sk)
324 struct tls_context *tls_ctx = tls_get_ctx(sk);
325 struct tls_prot_info *prot = &tls_ctx->prot_info;
326 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
327 struct sk_msg *msg_pl, *msg_en;
331 mem_size = sizeof(struct tls_rec) + crypto_aead_reqsize(ctx->aead_send);
333 rec = kzalloc(mem_size, sk->sk_allocation);
337 msg_pl = &rec->msg_plaintext;
338 msg_en = &rec->msg_encrypted;
343 sg_init_table(rec->sg_aead_in, 2);
344 sg_set_buf(&rec->sg_aead_in[0], rec->aad_space, prot->aad_size);
345 sg_unmark_end(&rec->sg_aead_in[1]);
347 sg_init_table(rec->sg_aead_out, 2);
348 sg_set_buf(&rec->sg_aead_out[0], rec->aad_space, prot->aad_size);
349 sg_unmark_end(&rec->sg_aead_out[1]);
356 static void tls_free_rec(struct sock *sk, struct tls_rec *rec)
358 sk_msg_free(sk, &rec->msg_encrypted);
359 sk_msg_free(sk, &rec->msg_plaintext);
363 static void tls_free_open_rec(struct sock *sk)
365 struct tls_context *tls_ctx = tls_get_ctx(sk);
366 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
367 struct tls_rec *rec = ctx->open_rec;
370 tls_free_rec(sk, rec);
371 ctx->open_rec = NULL;
375 int tls_tx_records(struct sock *sk, int flags)
377 struct tls_context *tls_ctx = tls_get_ctx(sk);
378 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
379 struct tls_rec *rec, *tmp;
380 struct sk_msg *msg_en;
381 int tx_flags, rc = 0;
383 if (tls_is_partially_sent_record(tls_ctx)) {
384 rec = list_first_entry(&ctx->tx_list,
385 struct tls_rec, list);
388 tx_flags = rec->tx_flags;
392 rc = tls_push_partial_record(sk, tls_ctx, tx_flags);
396 /* Full record has been transmitted.
397 * Remove the head of tx_list
399 list_del(&rec->list);
400 sk_msg_free(sk, &rec->msg_plaintext);
404 /* Tx all ready records */
405 list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) {
406 if (READ_ONCE(rec->tx_ready)) {
408 tx_flags = rec->tx_flags;
412 msg_en = &rec->msg_encrypted;
413 rc = tls_push_sg(sk, tls_ctx,
414 &msg_en->sg.data[msg_en->sg.curr],
419 list_del(&rec->list);
420 sk_msg_free(sk, &rec->msg_plaintext);
428 if (rc < 0 && rc != -EAGAIN)
429 tls_err_abort(sk, -EBADMSG);
434 static void tls_encrypt_done(void *data, int err)
436 struct tls_sw_context_tx *ctx;
437 struct tls_context *tls_ctx;
438 struct tls_prot_info *prot;
439 struct tls_rec *rec = data;
440 struct scatterlist *sge;
441 struct sk_msg *msg_en;
446 msg_en = &rec->msg_encrypted;
449 tls_ctx = tls_get_ctx(sk);
450 prot = &tls_ctx->prot_info;
451 ctx = tls_sw_ctx_tx(tls_ctx);
453 sge = sk_msg_elem(msg_en, msg_en->sg.curr);
454 sge->offset -= prot->prepend_size;
455 sge->length += prot->prepend_size;
457 /* Check if error is previously set on socket */
458 if (err || sk->sk_err) {
461 /* If err is already set on socket, return the same code */
463 ctx->async_wait.err = -sk->sk_err;
465 ctx->async_wait.err = err;
466 tls_err_abort(sk, err);
471 struct tls_rec *first_rec;
473 /* Mark the record as ready for transmission */
474 smp_store_mb(rec->tx_ready, true);
476 /* If received record is at head of tx_list, schedule tx */
477 first_rec = list_first_entry(&ctx->tx_list,
478 struct tls_rec, list);
479 if (rec == first_rec)
483 spin_lock_bh(&ctx->encrypt_compl_lock);
484 pending = atomic_dec_return(&ctx->encrypt_pending);
486 if (!pending && ctx->async_notify)
487 complete(&ctx->async_wait.completion);
488 spin_unlock_bh(&ctx->encrypt_compl_lock);
493 /* Schedule the transmission */
494 if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask))
495 schedule_delayed_work(&ctx->tx_work.work, 1);
498 static int tls_do_encryption(struct sock *sk,
499 struct tls_context *tls_ctx,
500 struct tls_sw_context_tx *ctx,
501 struct aead_request *aead_req,
502 size_t data_len, u32 start)
504 struct tls_prot_info *prot = &tls_ctx->prot_info;
505 struct tls_rec *rec = ctx->open_rec;
506 struct sk_msg *msg_en = &rec->msg_encrypted;
507 struct scatterlist *sge = sk_msg_elem(msg_en, start);
508 int rc, iv_offset = 0;
510 /* For CCM based ciphers, first byte of IV is a constant */
511 switch (prot->cipher_type) {
512 case TLS_CIPHER_AES_CCM_128:
513 rec->iv_data[0] = TLS_AES_CCM_IV_B0_BYTE;
516 case TLS_CIPHER_SM4_CCM:
517 rec->iv_data[0] = TLS_SM4_CCM_IV_B0_BYTE;
522 memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv,
523 prot->iv_size + prot->salt_size);
525 tls_xor_iv_with_seq(prot, rec->iv_data + iv_offset,
526 tls_ctx->tx.rec_seq);
528 sge->offset += prot->prepend_size;
529 sge->length -= prot->prepend_size;
531 msg_en->sg.curr = start;
533 aead_request_set_tfm(aead_req, ctx->aead_send);
534 aead_request_set_ad(aead_req, prot->aad_size);
535 aead_request_set_crypt(aead_req, rec->sg_aead_in,
537 data_len, rec->iv_data);
539 aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
540 tls_encrypt_done, rec);
542 /* Add the record in tx_list */
543 list_add_tail((struct list_head *)&rec->list, &ctx->tx_list);
544 atomic_inc(&ctx->encrypt_pending);
546 rc = crypto_aead_encrypt(aead_req);
547 if (!rc || rc != -EINPROGRESS) {
548 atomic_dec(&ctx->encrypt_pending);
549 sge->offset -= prot->prepend_size;
550 sge->length += prot->prepend_size;
554 WRITE_ONCE(rec->tx_ready, true);
555 } else if (rc != -EINPROGRESS) {
556 list_del(&rec->list);
560 /* Unhook the record from context if encryption is not failure */
561 ctx->open_rec = NULL;
562 tls_advance_record_sn(sk, prot, &tls_ctx->tx);
566 static int tls_split_open_record(struct sock *sk, struct tls_rec *from,
567 struct tls_rec **to, struct sk_msg *msg_opl,
568 struct sk_msg *msg_oen, u32 split_point,
569 u32 tx_overhead_size, u32 *orig_end)
571 u32 i, j, bytes = 0, apply = msg_opl->apply_bytes;
572 struct scatterlist *sge, *osge, *nsge;
573 u32 orig_size = msg_opl->sg.size;
574 struct scatterlist tmp = { };
575 struct sk_msg *msg_npl;
579 new = tls_get_rec(sk);
582 ret = sk_msg_alloc(sk, &new->msg_encrypted, msg_opl->sg.size +
583 tx_overhead_size, 0);
585 tls_free_rec(sk, new);
589 *orig_end = msg_opl->sg.end;
590 i = msg_opl->sg.start;
591 sge = sk_msg_elem(msg_opl, i);
592 while (apply && sge->length) {
593 if (sge->length > apply) {
594 u32 len = sge->length - apply;
596 get_page(sg_page(sge));
597 sg_set_page(&tmp, sg_page(sge), len,
598 sge->offset + apply);
603 apply -= sge->length;
604 bytes += sge->length;
607 sk_msg_iter_var_next(i);
608 if (i == msg_opl->sg.end)
610 sge = sk_msg_elem(msg_opl, i);
614 msg_opl->sg.curr = i;
615 msg_opl->sg.copybreak = 0;
616 msg_opl->apply_bytes = 0;
617 msg_opl->sg.size = bytes;
619 msg_npl = &new->msg_plaintext;
620 msg_npl->apply_bytes = apply;
621 msg_npl->sg.size = orig_size - bytes;
623 j = msg_npl->sg.start;
624 nsge = sk_msg_elem(msg_npl, j);
626 memcpy(nsge, &tmp, sizeof(*nsge));
627 sk_msg_iter_var_next(j);
628 nsge = sk_msg_elem(msg_npl, j);
631 osge = sk_msg_elem(msg_opl, i);
632 while (osge->length) {
633 memcpy(nsge, osge, sizeof(*nsge));
635 sk_msg_iter_var_next(i);
636 sk_msg_iter_var_next(j);
639 osge = sk_msg_elem(msg_opl, i);
640 nsge = sk_msg_elem(msg_npl, j);
644 msg_npl->sg.curr = j;
645 msg_npl->sg.copybreak = 0;
651 static void tls_merge_open_record(struct sock *sk, struct tls_rec *to,
652 struct tls_rec *from, u32 orig_end)
654 struct sk_msg *msg_npl = &from->msg_plaintext;
655 struct sk_msg *msg_opl = &to->msg_plaintext;
656 struct scatterlist *osge, *nsge;
660 sk_msg_iter_var_prev(i);
661 j = msg_npl->sg.start;
663 osge = sk_msg_elem(msg_opl, i);
664 nsge = sk_msg_elem(msg_npl, j);
666 if (sg_page(osge) == sg_page(nsge) &&
667 osge->offset + osge->length == nsge->offset) {
668 osge->length += nsge->length;
669 put_page(sg_page(nsge));
672 msg_opl->sg.end = orig_end;
673 msg_opl->sg.curr = orig_end;
674 msg_opl->sg.copybreak = 0;
675 msg_opl->apply_bytes = msg_opl->sg.size + msg_npl->sg.size;
676 msg_opl->sg.size += msg_npl->sg.size;
678 sk_msg_free(sk, &to->msg_encrypted);
679 sk_msg_xfer_full(&to->msg_encrypted, &from->msg_encrypted);
684 static int tls_push_record(struct sock *sk, int flags,
685 unsigned char record_type)
687 struct tls_context *tls_ctx = tls_get_ctx(sk);
688 struct tls_prot_info *prot = &tls_ctx->prot_info;
689 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
690 struct tls_rec *rec = ctx->open_rec, *tmp = NULL;
691 u32 i, split_point, orig_end;
692 struct sk_msg *msg_pl, *msg_en;
693 struct aead_request *req;
700 msg_pl = &rec->msg_plaintext;
701 msg_en = &rec->msg_encrypted;
703 split_point = msg_pl->apply_bytes;
704 split = split_point && split_point < msg_pl->sg.size;
705 if (unlikely((!split &&
707 prot->overhead_size > msg_en->sg.size) ||
710 prot->overhead_size > msg_en->sg.size))) {
712 split_point = msg_en->sg.size;
715 rc = tls_split_open_record(sk, rec, &tmp, msg_pl, msg_en,
716 split_point, prot->overhead_size,
720 /* This can happen if above tls_split_open_record allocates
721 * a single large encryption buffer instead of two smaller
722 * ones. In this case adjust pointers and continue without
725 if (!msg_pl->sg.size) {
726 tls_merge_open_record(sk, rec, tmp, orig_end);
727 msg_pl = &rec->msg_plaintext;
728 msg_en = &rec->msg_encrypted;
731 sk_msg_trim(sk, msg_en, msg_pl->sg.size +
732 prot->overhead_size);
735 rec->tx_flags = flags;
736 req = &rec->aead_req;
739 sk_msg_iter_var_prev(i);
741 rec->content_type = record_type;
742 if (prot->version == TLS_1_3_VERSION) {
743 /* Add content type to end of message. No padding added */
744 sg_set_buf(&rec->sg_content_type, &rec->content_type, 1);
745 sg_mark_end(&rec->sg_content_type);
746 sg_chain(msg_pl->sg.data, msg_pl->sg.end + 1,
747 &rec->sg_content_type);
749 sg_mark_end(sk_msg_elem(msg_pl, i));
752 if (msg_pl->sg.end < msg_pl->sg.start) {
753 sg_chain(&msg_pl->sg.data[msg_pl->sg.start],
754 MAX_SKB_FRAGS - msg_pl->sg.start + 1,
758 i = msg_pl->sg.start;
759 sg_chain(rec->sg_aead_in, 2, &msg_pl->sg.data[i]);
762 sk_msg_iter_var_prev(i);
763 sg_mark_end(sk_msg_elem(msg_en, i));
765 i = msg_en->sg.start;
766 sg_chain(rec->sg_aead_out, 2, &msg_en->sg.data[i]);
768 tls_make_aad(rec->aad_space, msg_pl->sg.size + prot->tail_size,
769 tls_ctx->tx.rec_seq, record_type, prot);
771 tls_fill_prepend(tls_ctx,
772 page_address(sg_page(&msg_en->sg.data[i])) +
773 msg_en->sg.data[i].offset,
774 msg_pl->sg.size + prot->tail_size,
777 tls_ctx->pending_open_record_frags = false;
779 rc = tls_do_encryption(sk, tls_ctx, ctx, req,
780 msg_pl->sg.size + prot->tail_size, i);
782 if (rc != -EINPROGRESS) {
783 tls_err_abort(sk, -EBADMSG);
785 tls_ctx->pending_open_record_frags = true;
786 tls_merge_open_record(sk, rec, tmp, orig_end);
789 ctx->async_capable = 1;
792 msg_pl = &tmp->msg_plaintext;
793 msg_en = &tmp->msg_encrypted;
794 sk_msg_trim(sk, msg_en, msg_pl->sg.size + prot->overhead_size);
795 tls_ctx->pending_open_record_frags = true;
799 return tls_tx_records(sk, flags);
802 static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk,
803 bool full_record, u8 record_type,
804 ssize_t *copied, int flags)
806 struct tls_context *tls_ctx = tls_get_ctx(sk);
807 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
808 struct sk_msg msg_redir = { };
809 struct sk_psock *psock;
810 struct sock *sk_redir;
812 bool enospc, policy, redir_ingress;
816 policy = !(flags & MSG_SENDPAGE_NOPOLICY);
817 psock = sk_psock_get(sk);
818 if (!psock || !policy) {
819 err = tls_push_record(sk, flags, record_type);
820 if (err && err != -EINPROGRESS && sk->sk_err == EBADMSG) {
821 *copied -= sk_msg_free(sk, msg);
822 tls_free_open_rec(sk);
826 sk_psock_put(sk, psock);
830 enospc = sk_msg_full(msg);
831 if (psock->eval == __SK_NONE) {
832 delta = msg->sg.size;
833 psock->eval = sk_psock_msg_verdict(sk, psock, msg);
834 delta -= msg->sg.size;
836 if (msg->cork_bytes && msg->cork_bytes > msg->sg.size &&
837 !enospc && !full_record) {
843 if (msg->apply_bytes && msg->apply_bytes < send)
844 send = msg->apply_bytes;
846 switch (psock->eval) {
848 err = tls_push_record(sk, flags, record_type);
849 if (err && err != -EINPROGRESS && sk->sk_err == EBADMSG) {
850 *copied -= sk_msg_free(sk, msg);
851 tls_free_open_rec(sk);
857 redir_ingress = psock->redir_ingress;
858 sk_redir = psock->sk_redir;
859 memcpy(&msg_redir, msg, sizeof(*msg));
860 if (msg->apply_bytes < send)
861 msg->apply_bytes = 0;
863 msg->apply_bytes -= send;
864 sk_msg_return_zero(sk, msg, send);
865 msg->sg.size -= send;
867 err = tcp_bpf_sendmsg_redir(sk_redir, redir_ingress,
868 &msg_redir, send, flags);
871 *copied -= sk_msg_free_nocharge(sk, &msg_redir);
874 if (msg->sg.size == 0)
875 tls_free_open_rec(sk);
879 sk_msg_free_partial(sk, msg, send);
880 if (msg->apply_bytes < send)
881 msg->apply_bytes = 0;
883 msg->apply_bytes -= send;
884 if (msg->sg.size == 0)
885 tls_free_open_rec(sk);
886 *copied -= (send + delta);
891 bool reset_eval = !ctx->open_rec;
895 msg = &rec->msg_plaintext;
896 if (!msg->apply_bytes)
900 psock->eval = __SK_NONE;
901 if (psock->sk_redir) {
902 sock_put(psock->sk_redir);
903 psock->sk_redir = NULL;
910 sk_psock_put(sk, psock);
914 static int tls_sw_push_pending_record(struct sock *sk, int flags)
916 struct tls_context *tls_ctx = tls_get_ctx(sk);
917 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
918 struct tls_rec *rec = ctx->open_rec;
919 struct sk_msg *msg_pl;
925 msg_pl = &rec->msg_plaintext;
926 copied = msg_pl->sg.size;
930 return bpf_exec_tx_verdict(msg_pl, sk, true, TLS_RECORD_TYPE_DATA,
934 static int tls_sw_sendmsg_splice(struct sock *sk, struct msghdr *msg,
935 struct sk_msg *msg_pl, size_t try_to_copy,
938 struct page *page = NULL, **pages = &page;
944 part = iov_iter_extract_pages(&msg->msg_iter, &pages,
945 try_to_copy, 1, 0, &off);
949 if (WARN_ON_ONCE(!sendpage_ok(page))) {
950 iov_iter_revert(&msg->msg_iter, part);
954 sk_msg_page_add(msg_pl, page, part, off);
955 msg_pl->sg.copybreak = 0;
956 msg_pl->sg.curr = msg_pl->sg.end;
957 sk_mem_charge(sk, part);
960 } while (try_to_copy && !sk_msg_full(msg_pl));
965 static int tls_sw_sendmsg_locked(struct sock *sk, struct msghdr *msg,
968 long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
969 struct tls_context *tls_ctx = tls_get_ctx(sk);
970 struct tls_prot_info *prot = &tls_ctx->prot_info;
971 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
972 bool async_capable = ctx->async_capable;
973 unsigned char record_type = TLS_RECORD_TYPE_DATA;
974 bool is_kvec = iov_iter_is_kvec(&msg->msg_iter);
975 bool eor = !(msg->msg_flags & MSG_MORE);
978 struct sk_msg *msg_pl, *msg_en;
989 if (!eor && (msg->msg_flags & MSG_EOR))
992 if (unlikely(msg->msg_controllen)) {
993 ret = tls_process_cmsg(sk, msg, &record_type);
995 if (ret == -EINPROGRESS)
997 else if (ret != -EAGAIN)
1002 while (msg_data_left(msg)) {
1009 rec = ctx->open_rec;
1011 rec = ctx->open_rec = tls_get_rec(sk);
1017 msg_pl = &rec->msg_plaintext;
1018 msg_en = &rec->msg_encrypted;
1020 orig_size = msg_pl->sg.size;
1021 full_record = false;
1022 try_to_copy = msg_data_left(msg);
1023 record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size;
1024 if (try_to_copy >= record_room) {
1025 try_to_copy = record_room;
1029 required_size = msg_pl->sg.size + try_to_copy +
1030 prot->overhead_size;
1032 if (!sk_stream_memory_free(sk))
1033 goto wait_for_sndbuf;
1036 ret = tls_alloc_encrypted_msg(sk, required_size);
1039 goto wait_for_memory;
1041 /* Adjust try_to_copy according to the amount that was
1042 * actually allocated. The difference is due
1043 * to max sg elements limit
1045 try_to_copy -= required_size - msg_en->sg.size;
1049 if (try_to_copy && (msg->msg_flags & MSG_SPLICE_PAGES)) {
1050 ret = tls_sw_sendmsg_splice(sk, msg, msg_pl,
1051 try_to_copy, &copied);
1054 tls_ctx->pending_open_record_frags = true;
1055 if (full_record || eor || sk_msg_full(msg_pl))
1060 if (!is_kvec && (full_record || eor) && !async_capable) {
1061 u32 first = msg_pl->sg.end;
1063 ret = sk_msg_zerocopy_from_iter(sk, &msg->msg_iter,
1064 msg_pl, try_to_copy);
1066 goto fallback_to_reg_send;
1069 copied += try_to_copy;
1071 sk_msg_sg_copy_set(msg_pl, first);
1072 ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
1073 record_type, &copied,
1076 if (ret == -EINPROGRESS)
1078 else if (ret == -ENOMEM)
1079 goto wait_for_memory;
1080 else if (ctx->open_rec && ret == -ENOSPC)
1082 else if (ret != -EAGAIN)
1087 copied -= try_to_copy;
1088 sk_msg_sg_copy_clear(msg_pl, first);
1089 iov_iter_revert(&msg->msg_iter,
1090 msg_pl->sg.size - orig_size);
1091 fallback_to_reg_send:
1092 sk_msg_trim(sk, msg_pl, orig_size);
1095 required_size = msg_pl->sg.size + try_to_copy;
1097 ret = tls_clone_plaintext_msg(sk, required_size);
1102 /* Adjust try_to_copy according to the amount that was
1103 * actually allocated. The difference is due
1104 * to max sg elements limit
1106 try_to_copy -= required_size - msg_pl->sg.size;
1108 sk_msg_trim(sk, msg_en,
1109 msg_pl->sg.size + prot->overhead_size);
1113 ret = sk_msg_memcopy_from_iter(sk, &msg->msg_iter,
1114 msg_pl, try_to_copy);
1119 /* Open records defined only if successfully copied, otherwise
1120 * we would trim the sg but not reset the open record frags.
1122 tls_ctx->pending_open_record_frags = true;
1123 copied += try_to_copy;
1125 if (full_record || eor) {
1126 ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
1127 record_type, &copied,
1130 if (ret == -EINPROGRESS)
1132 else if (ret == -ENOMEM)
1133 goto wait_for_memory;
1134 else if (ret != -EAGAIN) {
1145 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1147 ret = sk_stream_wait_memory(sk, &timeo);
1151 tls_trim_both_msgs(sk, orig_size);
1155 if (ctx->open_rec && msg_en->sg.size < required_size)
1156 goto alloc_encrypted;
1161 } else if (num_zc) {
1162 /* Wait for pending encryptions to get completed */
1163 spin_lock_bh(&ctx->encrypt_compl_lock);
1164 ctx->async_notify = true;
1166 pending = atomic_read(&ctx->encrypt_pending);
1167 spin_unlock_bh(&ctx->encrypt_compl_lock);
1169 crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
1171 reinit_completion(&ctx->async_wait.completion);
1173 /* There can be no concurrent accesses, since we have no
1174 * pending encrypt operations
1176 WRITE_ONCE(ctx->async_notify, false);
1178 if (ctx->async_wait.err) {
1179 ret = ctx->async_wait.err;
1184 /* Transmit if any encryptions have completed */
1185 if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) {
1186 cancel_delayed_work(&ctx->tx_work.work);
1187 tls_tx_records(sk, msg->msg_flags);
1191 ret = sk_stream_error(sk, msg->msg_flags, ret);
1192 return copied > 0 ? copied : ret;
1195 int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
1197 struct tls_context *tls_ctx = tls_get_ctx(sk);
1200 if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
1201 MSG_CMSG_COMPAT | MSG_SPLICE_PAGES | MSG_EOR |
1202 MSG_SENDPAGE_NOPOLICY))
1205 ret = mutex_lock_interruptible(&tls_ctx->tx_lock);
1209 ret = tls_sw_sendmsg_locked(sk, msg, size);
1211 mutex_unlock(&tls_ctx->tx_lock);
1216 * Handle unexpected EOF during splice without SPLICE_F_MORE set.
1218 void tls_sw_splice_eof(struct socket *sock)
1220 struct sock *sk = sock->sk;
1221 struct tls_context *tls_ctx = tls_get_ctx(sk);
1222 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
1223 struct tls_rec *rec;
1224 struct sk_msg *msg_pl;
1226 bool retrying = false;
1233 mutex_lock(&tls_ctx->tx_lock);
1237 /* same checks as in tls_sw_push_pending_record() */
1238 rec = ctx->open_rec;
1242 msg_pl = &rec->msg_plaintext;
1243 if (msg_pl->sg.size == 0)
1246 /* Check the BPF advisor and perform transmission. */
1247 ret = bpf_exec_tx_verdict(msg_pl, sk, false, TLS_RECORD_TYPE_DATA,
1262 /* Wait for pending encryptions to get completed */
1263 spin_lock_bh(&ctx->encrypt_compl_lock);
1264 ctx->async_notify = true;
1266 pending = atomic_read(&ctx->encrypt_pending);
1267 spin_unlock_bh(&ctx->encrypt_compl_lock);
1269 crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
1271 reinit_completion(&ctx->async_wait.completion);
1273 /* There can be no concurrent accesses, since we have no pending
1274 * encrypt operations
1276 WRITE_ONCE(ctx->async_notify, false);
1278 if (ctx->async_wait.err)
1281 /* Transmit if any encryptions have completed */
1282 if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) {
1283 cancel_delayed_work(&ctx->tx_work.work);
1284 tls_tx_records(sk, 0);
1289 mutex_unlock(&tls_ctx->tx_lock);
1293 tls_rx_rec_wait(struct sock *sk, struct sk_psock *psock, bool nonblock,
1296 struct tls_context *tls_ctx = tls_get_ctx(sk);
1297 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1298 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1302 timeo = sock_rcvtimeo(sk, nonblock);
1304 while (!tls_strp_msg_ready(ctx)) {
1305 if (!sk_psock_queue_empty(psock))
1309 return sock_error(sk);
1314 if (!skb_queue_empty(&sk->sk_receive_queue)) {
1315 tls_strp_check_rcv(&ctx->strp);
1316 if (tls_strp_msg_ready(ctx))
1320 if (sk->sk_shutdown & RCV_SHUTDOWN)
1323 if (sock_flag(sk, SOCK_DONE))
1330 add_wait_queue(sk_sleep(sk), &wait);
1331 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1332 ret = sk_wait_event(sk, &timeo,
1333 tls_strp_msg_ready(ctx) ||
1334 !sk_psock_queue_empty(psock),
1336 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1337 remove_wait_queue(sk_sleep(sk), &wait);
1339 /* Handle signals */
1340 if (signal_pending(current))
1341 return sock_intr_errno(timeo);
1344 tls_strp_msg_load(&ctx->strp, released);
1349 static int tls_setup_from_iter(struct iov_iter *from,
1350 int length, int *pages_used,
1351 struct scatterlist *to,
1354 int rc = 0, i = 0, num_elem = *pages_used, maxpages;
1355 struct page *pages[MAX_SKB_FRAGS];
1356 unsigned int size = 0;
1357 ssize_t copied, use;
1360 while (length > 0) {
1362 maxpages = to_max_pages - num_elem;
1363 if (maxpages == 0) {
1367 copied = iov_iter_get_pages2(from, pages,
1378 use = min_t(int, copied, PAGE_SIZE - offset);
1380 sg_set_page(&to[num_elem],
1381 pages[i], use, offset);
1382 sg_unmark_end(&to[num_elem]);
1383 /* We do not uncharge memory from this API */
1392 /* Mark the end in the last sg entry if newly added */
1393 if (num_elem > *pages_used)
1394 sg_mark_end(&to[num_elem - 1]);
1397 iov_iter_revert(from, size);
1398 *pages_used = num_elem;
1403 static struct sk_buff *
1404 tls_alloc_clrtxt_skb(struct sock *sk, struct sk_buff *skb,
1405 unsigned int full_len)
1407 struct strp_msg *clr_rxm;
1408 struct sk_buff *clr_skb;
1411 clr_skb = alloc_skb_with_frags(0, full_len, TLS_PAGE_ORDER,
1412 &err, sk->sk_allocation);
1416 skb_copy_header(clr_skb, skb);
1417 clr_skb->len = full_len;
1418 clr_skb->data_len = full_len;
1420 clr_rxm = strp_msg(clr_skb);
1421 clr_rxm->offset = 0;
1428 * tls_decrypt_sw() and tls_decrypt_device() are decrypt handlers.
1429 * They must transform the darg in/out argument are as follows:
1431 * -------------------------------------------------------------------
1432 * zc | Zero-copy decrypt allowed | Zero-copy performed
1433 * async | Async decrypt allowed | Async crypto used / in progress
1434 * skb | * | Output skb
1436 * If ZC decryption was performed darg.skb will point to the input skb.
1439 /* This function decrypts the input skb into either out_iov or in out_sg
1440 * or in skb buffers itself. The input parameter 'darg->zc' indicates if
1441 * zero-copy mode needs to be tried or not. With zero-copy mode, either
1442 * out_iov or out_sg must be non-NULL. In case both out_iov and out_sg are
1443 * NULL, then the decryption happens inside skb buffers itself, i.e.
1444 * zero-copy gets disabled and 'darg->zc' is updated.
1446 static int tls_decrypt_sg(struct sock *sk, struct iov_iter *out_iov,
1447 struct scatterlist *out_sg,
1448 struct tls_decrypt_arg *darg)
1450 struct tls_context *tls_ctx = tls_get_ctx(sk);
1451 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1452 struct tls_prot_info *prot = &tls_ctx->prot_info;
1453 int n_sgin, n_sgout, aead_size, err, pages = 0;
1454 struct sk_buff *skb = tls_strp_msg(ctx);
1455 const struct strp_msg *rxm = strp_msg(skb);
1456 const struct tls_msg *tlm = tls_msg(skb);
1457 struct aead_request *aead_req;
1458 struct scatterlist *sgin = NULL;
1459 struct scatterlist *sgout = NULL;
1460 const int data_len = rxm->full_len - prot->overhead_size;
1461 int tail_pages = !!prot->tail_size;
1462 struct tls_decrypt_ctx *dctx;
1463 struct sk_buff *clear_skb;
1467 n_sgin = skb_nsg(skb, rxm->offset + prot->prepend_size,
1468 rxm->full_len - prot->prepend_size);
1470 return n_sgin ?: -EBADMSG;
1472 if (darg->zc && (out_iov || out_sg)) {
1476 n_sgout = 1 + tail_pages +
1477 iov_iter_npages_cap(out_iov, INT_MAX, data_len);
1479 n_sgout = sg_nents(out_sg);
1483 clear_skb = tls_alloc_clrtxt_skb(sk, skb, rxm->full_len);
1487 n_sgout = 1 + skb_shinfo(clear_skb)->nr_frags;
1490 /* Increment to accommodate AAD */
1491 n_sgin = n_sgin + 1;
1493 /* Allocate a single block of memory which contains
1494 * aead_req || tls_decrypt_ctx.
1495 * Both structs are variable length.
1497 aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv);
1498 aead_size = ALIGN(aead_size, __alignof__(*dctx));
1499 mem = kmalloc(aead_size + struct_size(dctx, sg, size_add(n_sgin, n_sgout)),
1506 /* Segment the allocated memory */
1507 aead_req = (struct aead_request *)mem;
1508 dctx = (struct tls_decrypt_ctx *)(mem + aead_size);
1510 sgin = &dctx->sg[0];
1511 sgout = &dctx->sg[n_sgin];
1513 /* For CCM based ciphers, first byte of nonce+iv is a constant */
1514 switch (prot->cipher_type) {
1515 case TLS_CIPHER_AES_CCM_128:
1516 dctx->iv[0] = TLS_AES_CCM_IV_B0_BYTE;
1519 case TLS_CIPHER_SM4_CCM:
1520 dctx->iv[0] = TLS_SM4_CCM_IV_B0_BYTE;
1526 if (prot->version == TLS_1_3_VERSION ||
1527 prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) {
1528 memcpy(&dctx->iv[iv_offset], tls_ctx->rx.iv,
1529 prot->iv_size + prot->salt_size);
1531 err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
1532 &dctx->iv[iv_offset] + prot->salt_size,
1536 memcpy(&dctx->iv[iv_offset], tls_ctx->rx.iv, prot->salt_size);
1538 tls_xor_iv_with_seq(prot, &dctx->iv[iv_offset], tls_ctx->rx.rec_seq);
1541 tls_make_aad(dctx->aad, rxm->full_len - prot->overhead_size +
1543 tls_ctx->rx.rec_seq, tlm->control, prot);
1546 sg_init_table(sgin, n_sgin);
1547 sg_set_buf(&sgin[0], dctx->aad, prot->aad_size);
1548 err = skb_to_sgvec(skb, &sgin[1],
1549 rxm->offset + prot->prepend_size,
1550 rxm->full_len - prot->prepend_size);
1555 sg_init_table(sgout, n_sgout);
1556 sg_set_buf(&sgout[0], dctx->aad, prot->aad_size);
1558 err = skb_to_sgvec(clear_skb, &sgout[1], prot->prepend_size,
1559 data_len + prot->tail_size);
1562 } else if (out_iov) {
1563 sg_init_table(sgout, n_sgout);
1564 sg_set_buf(&sgout[0], dctx->aad, prot->aad_size);
1566 err = tls_setup_from_iter(out_iov, data_len, &pages, &sgout[1],
1567 (n_sgout - 1 - tail_pages));
1569 goto exit_free_pages;
1571 if (prot->tail_size) {
1572 sg_unmark_end(&sgout[pages]);
1573 sg_set_buf(&sgout[pages + 1], &dctx->tail,
1575 sg_mark_end(&sgout[pages + 1]);
1577 } else if (out_sg) {
1578 memcpy(sgout, out_sg, n_sgout * sizeof(*sgout));
1581 /* Prepare and submit AEAD request */
1582 err = tls_do_decryption(sk, sgin, sgout, dctx->iv,
1583 data_len + prot->tail_size, aead_req, darg);
1585 goto exit_free_pages;
1587 darg->skb = clear_skb ?: tls_strp_msg(ctx);
1590 if (unlikely(darg->async)) {
1591 err = tls_strp_msg_hold(&ctx->strp, &ctx->async_hold);
1593 __skb_queue_tail(&ctx->async_hold, darg->skb);
1597 if (prot->tail_size)
1598 darg->tail = dctx->tail;
1601 /* Release the pages in case iov was mapped to pages */
1602 for (; pages > 0; pages--)
1603 put_page(sg_page(&sgout[pages]));
1607 consume_skb(clear_skb);
1612 tls_decrypt_sw(struct sock *sk, struct tls_context *tls_ctx,
1613 struct msghdr *msg, struct tls_decrypt_arg *darg)
1615 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1616 struct tls_prot_info *prot = &tls_ctx->prot_info;
1617 struct strp_msg *rxm;
1620 err = tls_decrypt_sg(sk, &msg->msg_iter, NULL, darg);
1622 if (err == -EBADMSG)
1623 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSDECRYPTERROR);
1626 /* keep going even for ->async, the code below is TLS 1.3 */
1628 /* If opportunistic TLS 1.3 ZC failed retry without ZC */
1629 if (unlikely(darg->zc && prot->version == TLS_1_3_VERSION &&
1630 darg->tail != TLS_RECORD_TYPE_DATA)) {
1633 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXNOPADVIOL);
1634 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSDECRYPTRETRY);
1635 return tls_decrypt_sw(sk, tls_ctx, msg, darg);
1638 pad = tls_padding_length(prot, darg->skb, darg);
1640 if (darg->skb != tls_strp_msg(ctx))
1641 consume_skb(darg->skb);
1645 rxm = strp_msg(darg->skb);
1646 rxm->full_len -= pad;
1652 tls_decrypt_device(struct sock *sk, struct msghdr *msg,
1653 struct tls_context *tls_ctx, struct tls_decrypt_arg *darg)
1655 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1656 struct tls_prot_info *prot = &tls_ctx->prot_info;
1657 struct strp_msg *rxm;
1660 if (tls_ctx->rx_conf != TLS_HW)
1663 err = tls_device_decrypted(sk, tls_ctx);
1667 pad = tls_padding_length(prot, tls_strp_msg(ctx), darg);
1671 darg->async = false;
1672 darg->skb = tls_strp_msg(ctx);
1673 /* ->zc downgrade check, in case TLS 1.3 gets here */
1674 darg->zc &= !(prot->version == TLS_1_3_VERSION &&
1675 tls_msg(darg->skb)->control != TLS_RECORD_TYPE_DATA);
1677 rxm = strp_msg(darg->skb);
1678 rxm->full_len -= pad;
1681 /* Non-ZC case needs a real skb */
1682 darg->skb = tls_strp_msg_detach(ctx);
1686 unsigned int off, len;
1688 /* In ZC case nobody cares about the output skb.
1689 * Just copy the data here. Note the skb is not fully trimmed.
1691 off = rxm->offset + prot->prepend_size;
1692 len = rxm->full_len - prot->overhead_size;
1694 err = skb_copy_datagram_msg(darg->skb, off, msg, len);
1701 static int tls_rx_one_record(struct sock *sk, struct msghdr *msg,
1702 struct tls_decrypt_arg *darg)
1704 struct tls_context *tls_ctx = tls_get_ctx(sk);
1705 struct tls_prot_info *prot = &tls_ctx->prot_info;
1706 struct strp_msg *rxm;
1709 err = tls_decrypt_device(sk, msg, tls_ctx, darg);
1711 err = tls_decrypt_sw(sk, tls_ctx, msg, darg);
1715 rxm = strp_msg(darg->skb);
1716 rxm->offset += prot->prepend_size;
1717 rxm->full_len -= prot->overhead_size;
1718 tls_advance_record_sn(sk, prot, &tls_ctx->rx);
1723 int decrypt_skb(struct sock *sk, struct scatterlist *sgout)
1725 struct tls_decrypt_arg darg = { .zc = true, };
1727 return tls_decrypt_sg(sk, NULL, sgout, &darg);
1730 static int tls_record_content_type(struct msghdr *msg, struct tls_msg *tlm,
1736 *control = tlm->control;
1740 err = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE,
1741 sizeof(*control), control);
1742 if (*control != TLS_RECORD_TYPE_DATA) {
1743 if (err || msg->msg_flags & MSG_CTRUNC)
1746 } else if (*control != tlm->control) {
1753 static void tls_rx_rec_done(struct tls_sw_context_rx *ctx)
1755 tls_strp_msg_done(&ctx->strp);
1758 /* This function traverses the rx_list in tls receive context to copies the
1759 * decrypted records into the buffer provided by caller zero copy is not
1760 * true. Further, the records are removed from the rx_list if it is not a peek
1761 * case and the record has been consumed completely.
1763 static int process_rx_list(struct tls_sw_context_rx *ctx,
1770 struct sk_buff *skb = skb_peek(&ctx->rx_list);
1771 struct tls_msg *tlm;
1775 while (skip && skb) {
1776 struct strp_msg *rxm = strp_msg(skb);
1779 err = tls_record_content_type(msg, tlm, control);
1783 if (skip < rxm->full_len)
1786 skip = skip - rxm->full_len;
1787 skb = skb_peek_next(skb, &ctx->rx_list);
1790 while (len && skb) {
1791 struct sk_buff *next_skb;
1792 struct strp_msg *rxm = strp_msg(skb);
1793 int chunk = min_t(unsigned int, rxm->full_len - skip, len);
1797 err = tls_record_content_type(msg, tlm, control);
1801 err = skb_copy_datagram_msg(skb, rxm->offset + skip,
1807 copied = copied + chunk;
1809 /* Consume the data from record if it is non-peek case*/
1811 rxm->offset = rxm->offset + chunk;
1812 rxm->full_len = rxm->full_len - chunk;
1814 /* Return if there is unconsumed data in the record */
1815 if (rxm->full_len - skip)
1819 /* The remaining skip-bytes must lie in 1st record in rx_list.
1820 * So from the 2nd record, 'skip' should be 0.
1825 msg->msg_flags |= MSG_EOR;
1827 next_skb = skb_peek_next(skb, &ctx->rx_list);
1830 __skb_unlink(skb, &ctx->rx_list);
1839 return copied ? : err;
1843 tls_read_flush_backlog(struct sock *sk, struct tls_prot_info *prot,
1844 size_t len_left, size_t decrypted, ssize_t done,
1849 if (len_left <= decrypted)
1852 max_rec = prot->overhead_size - prot->tail_size + TLS_MAX_PAYLOAD_SIZE;
1853 if (done - *flushed_at < SZ_128K && tcp_inq(sk) > max_rec)
1857 return sk_flush_backlog(sk);
1860 static int tls_rx_reader_acquire(struct sock *sk, struct tls_sw_context_rx *ctx,
1866 timeo = sock_rcvtimeo(sk, nonblock);
1868 while (unlikely(ctx->reader_present)) {
1869 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1871 ctx->reader_contended = 1;
1873 add_wait_queue(&ctx->wq, &wait);
1874 ret = sk_wait_event(sk, &timeo,
1875 !READ_ONCE(ctx->reader_present), &wait);
1876 remove_wait_queue(&ctx->wq, &wait);
1880 if (signal_pending(current))
1881 return sock_intr_errno(timeo);
1886 WRITE_ONCE(ctx->reader_present, 1);
1891 static int tls_rx_reader_lock(struct sock *sk, struct tls_sw_context_rx *ctx,
1897 err = tls_rx_reader_acquire(sk, ctx, nonblock);
1903 static void tls_rx_reader_release(struct sock *sk, struct tls_sw_context_rx *ctx)
1905 if (unlikely(ctx->reader_contended)) {
1906 if (wq_has_sleeper(&ctx->wq))
1909 ctx->reader_contended = 0;
1911 WARN_ON_ONCE(!ctx->reader_present);
1914 WRITE_ONCE(ctx->reader_present, 0);
1917 static void tls_rx_reader_unlock(struct sock *sk, struct tls_sw_context_rx *ctx)
1919 tls_rx_reader_release(sk, ctx);
1923 int tls_sw_recvmsg(struct sock *sk,
1929 struct tls_context *tls_ctx = tls_get_ctx(sk);
1930 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1931 struct tls_prot_info *prot = &tls_ctx->prot_info;
1932 ssize_t decrypted = 0, async_copy_bytes = 0;
1933 struct sk_psock *psock;
1934 unsigned char control = 0;
1935 size_t flushed_at = 0;
1936 struct strp_msg *rxm;
1937 struct tls_msg *tlm;
1941 bool is_kvec = iov_iter_is_kvec(&msg->msg_iter);
1942 bool is_peek = flags & MSG_PEEK;
1943 bool released = true;
1944 bool bpf_strp_enabled;
1947 if (unlikely(flags & MSG_ERRQUEUE))
1948 return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR);
1950 psock = sk_psock_get(sk);
1951 err = tls_rx_reader_lock(sk, ctx, flags & MSG_DONTWAIT);
1954 bpf_strp_enabled = sk_psock_strp_enabled(psock);
1956 /* If crypto failed the connection is broken */
1957 err = ctx->async_wait.err;
1961 /* Process pending decrypted records. It must be non-zero-copy */
1962 err = process_rx_list(ctx, msg, &control, 0, len, is_peek);
1970 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
1973 zc_capable = !bpf_strp_enabled && !is_kvec && !is_peek &&
1976 while (len && (decrypted + copied < target || tls_strp_msg_ready(ctx))) {
1977 struct tls_decrypt_arg darg;
1978 int to_decrypt, chunk;
1980 err = tls_rx_rec_wait(sk, psock, flags & MSG_DONTWAIT,
1984 chunk = sk_msg_recvmsg(sk, psock, msg, len,
1995 memset(&darg.inargs, 0, sizeof(darg.inargs));
1997 rxm = strp_msg(tls_strp_msg(ctx));
1998 tlm = tls_msg(tls_strp_msg(ctx));
2000 to_decrypt = rxm->full_len - prot->overhead_size;
2002 if (zc_capable && to_decrypt <= len &&
2003 tlm->control == TLS_RECORD_TYPE_DATA)
2006 /* Do not use async mode if record is non-data */
2007 if (tlm->control == TLS_RECORD_TYPE_DATA && !bpf_strp_enabled)
2008 darg.async = ctx->async_capable;
2012 err = tls_rx_one_record(sk, msg, &darg);
2014 tls_err_abort(sk, -EBADMSG);
2018 async |= darg.async;
2020 /* If the type of records being processed is not known yet,
2021 * set it to record type just dequeued. If it is already known,
2022 * but does not match the record type just dequeued, go to end.
2023 * We always get record type here since for tls1.2, record type
2024 * is known just after record is dequeued from stream parser.
2025 * For tls1.3, we disable async.
2027 err = tls_record_content_type(msg, tls_msg(darg.skb), &control);
2029 DEBUG_NET_WARN_ON_ONCE(darg.zc);
2030 tls_rx_rec_done(ctx);
2032 __skb_queue_tail(&ctx->rx_list, darg.skb);
2036 /* periodically flush backlog, and feed strparser */
2037 released = tls_read_flush_backlog(sk, prot, len, to_decrypt,
2041 /* TLS 1.3 may have updated the length by more than overhead */
2042 rxm = strp_msg(darg.skb);
2043 chunk = rxm->full_len;
2044 tls_rx_rec_done(ctx);
2047 bool partially_consumed = chunk > len;
2048 struct sk_buff *skb = darg.skb;
2050 DEBUG_NET_WARN_ON_ONCE(darg.skb == ctx->strp.anchor);
2053 /* TLS 1.2-only, to_decrypt must be text len */
2054 chunk = min_t(int, to_decrypt, len);
2055 async_copy_bytes += chunk;
2059 __skb_queue_tail(&ctx->rx_list, skb);
2063 if (bpf_strp_enabled) {
2065 err = sk_psock_tls_strp_read(psock, skb);
2066 if (err != __SK_PASS) {
2067 rxm->offset = rxm->offset + rxm->full_len;
2069 if (err == __SK_DROP)
2075 if (partially_consumed)
2078 err = skb_copy_datagram_msg(skb, rxm->offset,
2081 goto put_on_rx_list_err;
2084 goto put_on_rx_list;
2086 if (partially_consumed) {
2087 rxm->offset += chunk;
2088 rxm->full_len -= chunk;
2089 goto put_on_rx_list;
2098 /* Return full control message to userspace before trying
2099 * to parse another message type
2101 msg->msg_flags |= MSG_EOR;
2102 if (control != TLS_RECORD_TYPE_DATA)
2110 /* Wait for all previously submitted records to be decrypted */
2111 spin_lock_bh(&ctx->decrypt_compl_lock);
2112 reinit_completion(&ctx->async_wait.completion);
2113 pending = atomic_read(&ctx->decrypt_pending);
2114 spin_unlock_bh(&ctx->decrypt_compl_lock);
2117 ret = crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
2118 __skb_queue_purge(&ctx->async_hold);
2121 if (err >= 0 || err == -EINPROGRESS)
2127 /* Drain records from the rx_list & copy if required */
2128 if (is_peek || is_kvec)
2129 err = process_rx_list(ctx, msg, &control, copied,
2130 decrypted, is_peek);
2132 err = process_rx_list(ctx, msg, &control, 0,
2133 async_copy_bytes, is_peek);
2134 decrypted += max(err, 0);
2137 copied += decrypted;
2140 tls_rx_reader_unlock(sk, ctx);
2142 sk_psock_put(sk, psock);
2143 return copied ? : err;
2146 ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
2147 struct pipe_inode_info *pipe,
2148 size_t len, unsigned int flags)
2150 struct tls_context *tls_ctx = tls_get_ctx(sock->sk);
2151 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2152 struct strp_msg *rxm = NULL;
2153 struct sock *sk = sock->sk;
2154 struct tls_msg *tlm;
2155 struct sk_buff *skb;
2160 err = tls_rx_reader_lock(sk, ctx, flags & SPLICE_F_NONBLOCK);
2164 if (!skb_queue_empty(&ctx->rx_list)) {
2165 skb = __skb_dequeue(&ctx->rx_list);
2167 struct tls_decrypt_arg darg;
2169 err = tls_rx_rec_wait(sk, NULL, flags & SPLICE_F_NONBLOCK,
2172 goto splice_read_end;
2174 memset(&darg.inargs, 0, sizeof(darg.inargs));
2176 err = tls_rx_one_record(sk, NULL, &darg);
2178 tls_err_abort(sk, -EBADMSG);
2179 goto splice_read_end;
2182 tls_rx_rec_done(ctx);
2186 rxm = strp_msg(skb);
2189 /* splice does not support reading control messages */
2190 if (tlm->control != TLS_RECORD_TYPE_DATA) {
2192 goto splice_requeue;
2195 chunk = min_t(unsigned int, rxm->full_len, len);
2196 copied = skb_splice_bits(skb, sk, rxm->offset, pipe, chunk, flags);
2198 goto splice_requeue;
2200 if (chunk < rxm->full_len) {
2202 rxm->full_len -= len;
2203 goto splice_requeue;
2209 tls_rx_reader_unlock(sk, ctx);
2210 return copied ? : err;
2213 __skb_queue_head(&ctx->rx_list, skb);
2214 goto splice_read_end;
2217 int tls_sw_read_sock(struct sock *sk, read_descriptor_t *desc,
2218 sk_read_actor_t read_actor)
2220 struct tls_context *tls_ctx = tls_get_ctx(sk);
2221 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2222 struct tls_prot_info *prot = &tls_ctx->prot_info;
2223 struct strp_msg *rxm = NULL;
2224 struct sk_buff *skb = NULL;
2225 struct sk_psock *psock;
2226 size_t flushed_at = 0;
2227 bool released = true;
2228 struct tls_msg *tlm;
2233 psock = sk_psock_get(sk);
2235 sk_psock_put(sk, psock);
2238 err = tls_rx_reader_acquire(sk, ctx, true);
2242 /* If crypto failed the connection is broken */
2243 err = ctx->async_wait.err;
2249 if (!skb_queue_empty(&ctx->rx_list)) {
2250 skb = __skb_dequeue(&ctx->rx_list);
2251 rxm = strp_msg(skb);
2254 struct tls_decrypt_arg darg;
2256 err = tls_rx_rec_wait(sk, NULL, true, released);
2260 memset(&darg.inargs, 0, sizeof(darg.inargs));
2262 err = tls_rx_one_record(sk, NULL, &darg);
2264 tls_err_abort(sk, -EBADMSG);
2268 released = tls_read_flush_backlog(sk, prot, INT_MAX,
2272 rxm = strp_msg(skb);
2274 decrypted += rxm->full_len;
2276 tls_rx_rec_done(ctx);
2279 /* read_sock does not support reading control messages */
2280 if (tlm->control != TLS_RECORD_TYPE_DATA) {
2282 goto read_sock_requeue;
2285 used = read_actor(desc, skb, rxm->offset, rxm->full_len);
2289 goto read_sock_requeue;
2292 if (used < rxm->full_len) {
2293 rxm->offset += used;
2294 rxm->full_len -= used;
2296 goto read_sock_requeue;
2305 tls_rx_reader_release(sk, ctx);
2306 return copied ? : err;
2309 __skb_queue_head(&ctx->rx_list, skb);
2313 bool tls_sw_sock_is_readable(struct sock *sk)
2315 struct tls_context *tls_ctx = tls_get_ctx(sk);
2316 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2317 bool ingress_empty = true;
2318 struct sk_psock *psock;
2321 psock = sk_psock(sk);
2323 ingress_empty = list_empty(&psock->ingress_msg);
2326 return !ingress_empty || tls_strp_msg_ready(ctx) ||
2327 !skb_queue_empty(&ctx->rx_list);
2330 int tls_rx_msg_size(struct tls_strparser *strp, struct sk_buff *skb)
2332 struct tls_context *tls_ctx = tls_get_ctx(strp->sk);
2333 struct tls_prot_info *prot = &tls_ctx->prot_info;
2334 char header[TLS_HEADER_SIZE + TLS_MAX_IV_SIZE];
2335 size_t cipher_overhead;
2336 size_t data_len = 0;
2339 /* Verify that we have a full TLS header, or wait for more data */
2340 if (strp->stm.offset + prot->prepend_size > skb->len)
2343 /* Sanity-check size of on-stack buffer. */
2344 if (WARN_ON(prot->prepend_size > sizeof(header))) {
2349 /* Linearize header to local buffer */
2350 ret = skb_copy_bits(skb, strp->stm.offset, header, prot->prepend_size);
2354 strp->mark = header[0];
2356 data_len = ((header[4] & 0xFF) | (header[3] << 8));
2358 cipher_overhead = prot->tag_size;
2359 if (prot->version != TLS_1_3_VERSION &&
2360 prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305)
2361 cipher_overhead += prot->iv_size;
2363 if (data_len > TLS_MAX_PAYLOAD_SIZE + cipher_overhead +
2368 if (data_len < cipher_overhead) {
2373 /* Note that both TLS1.3 and TLS1.2 use TLS_1_2 version here */
2374 if (header[1] != TLS_1_2_VERSION_MINOR ||
2375 header[2] != TLS_1_2_VERSION_MAJOR) {
2380 tls_device_rx_resync_new_rec(strp->sk, data_len + TLS_HEADER_SIZE,
2381 TCP_SKB_CB(skb)->seq + strp->stm.offset);
2382 return data_len + TLS_HEADER_SIZE;
2385 tls_err_abort(strp->sk, ret);
2390 void tls_rx_msg_ready(struct tls_strparser *strp)
2392 struct tls_sw_context_rx *ctx;
2394 ctx = container_of(strp, struct tls_sw_context_rx, strp);
2395 ctx->saved_data_ready(strp->sk);
2398 static void tls_data_ready(struct sock *sk)
2400 struct tls_context *tls_ctx = tls_get_ctx(sk);
2401 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2402 struct sk_psock *psock;
2405 trace_sk_data_ready(sk);
2407 alloc_save = sk->sk_allocation;
2408 sk->sk_allocation = GFP_ATOMIC;
2409 tls_strp_data_ready(&ctx->strp);
2410 sk->sk_allocation = alloc_save;
2412 psock = sk_psock_get(sk);
2414 if (!list_empty(&psock->ingress_msg))
2415 ctx->saved_data_ready(sk);
2416 sk_psock_put(sk, psock);
2420 void tls_sw_cancel_work_tx(struct tls_context *tls_ctx)
2422 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
2424 set_bit(BIT_TX_CLOSING, &ctx->tx_bitmask);
2425 set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask);
2426 cancel_delayed_work_sync(&ctx->tx_work.work);
2429 void tls_sw_release_resources_tx(struct sock *sk)
2431 struct tls_context *tls_ctx = tls_get_ctx(sk);
2432 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
2433 struct tls_rec *rec, *tmp;
2436 /* Wait for any pending async encryptions to complete */
2437 spin_lock_bh(&ctx->encrypt_compl_lock);
2438 ctx->async_notify = true;
2439 pending = atomic_read(&ctx->encrypt_pending);
2440 spin_unlock_bh(&ctx->encrypt_compl_lock);
2443 crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
2445 tls_tx_records(sk, -1);
2447 /* Free up un-sent records in tx_list. First, free
2448 * the partially sent record if any at head of tx_list.
2450 if (tls_ctx->partially_sent_record) {
2451 tls_free_partial_record(sk, tls_ctx);
2452 rec = list_first_entry(&ctx->tx_list,
2453 struct tls_rec, list);
2454 list_del(&rec->list);
2455 sk_msg_free(sk, &rec->msg_plaintext);
2459 list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) {
2460 list_del(&rec->list);
2461 sk_msg_free(sk, &rec->msg_encrypted);
2462 sk_msg_free(sk, &rec->msg_plaintext);
2466 crypto_free_aead(ctx->aead_send);
2467 tls_free_open_rec(sk);
2470 void tls_sw_free_ctx_tx(struct tls_context *tls_ctx)
2472 struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
2477 void tls_sw_release_resources_rx(struct sock *sk)
2479 struct tls_context *tls_ctx = tls_get_ctx(sk);
2480 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2482 if (ctx->aead_recv) {
2483 __skb_queue_purge(&ctx->rx_list);
2484 crypto_free_aead(ctx->aead_recv);
2485 tls_strp_stop(&ctx->strp);
2486 /* If tls_sw_strparser_arm() was not called (cleanup paths)
2487 * we still want to tls_strp_stop(), but sk->sk_data_ready was
2490 if (ctx->saved_data_ready) {
2491 write_lock_bh(&sk->sk_callback_lock);
2492 sk->sk_data_ready = ctx->saved_data_ready;
2493 write_unlock_bh(&sk->sk_callback_lock);
2498 void tls_sw_strparser_done(struct tls_context *tls_ctx)
2500 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2502 tls_strp_done(&ctx->strp);
2505 void tls_sw_free_ctx_rx(struct tls_context *tls_ctx)
2507 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2512 void tls_sw_free_resources_rx(struct sock *sk)
2514 struct tls_context *tls_ctx = tls_get_ctx(sk);
2516 tls_sw_release_resources_rx(sk);
2517 tls_sw_free_ctx_rx(tls_ctx);
2520 /* The work handler to transmitt the encrypted records in tx_list */
2521 static void tx_work_handler(struct work_struct *work)
2523 struct delayed_work *delayed_work = to_delayed_work(work);
2524 struct tx_work *tx_work = container_of(delayed_work,
2525 struct tx_work, work);
2526 struct sock *sk = tx_work->sk;
2527 struct tls_context *tls_ctx = tls_get_ctx(sk);
2528 struct tls_sw_context_tx *ctx;
2530 if (unlikely(!tls_ctx))
2533 ctx = tls_sw_ctx_tx(tls_ctx);
2534 if (test_bit(BIT_TX_CLOSING, &ctx->tx_bitmask))
2537 if (!test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask))
2540 if (mutex_trylock(&tls_ctx->tx_lock)) {
2542 tls_tx_records(sk, -1);
2544 mutex_unlock(&tls_ctx->tx_lock);
2545 } else if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) {
2546 /* Someone is holding the tx_lock, they will likely run Tx
2547 * and cancel the work on their way out of the lock section.
2548 * Schedule a long delay just in case.
2550 schedule_delayed_work(&ctx->tx_work.work, msecs_to_jiffies(10));
2554 static bool tls_is_tx_ready(struct tls_sw_context_tx *ctx)
2556 struct tls_rec *rec;
2558 rec = list_first_entry_or_null(&ctx->tx_list, struct tls_rec, list);
2562 return READ_ONCE(rec->tx_ready);
2565 void tls_sw_write_space(struct sock *sk, struct tls_context *ctx)
2567 struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx);
2569 /* Schedule the transmission if tx list is ready */
2570 if (tls_is_tx_ready(tx_ctx) &&
2571 !test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask))
2572 schedule_delayed_work(&tx_ctx->tx_work.work, 0);
2575 void tls_sw_strparser_arm(struct sock *sk, struct tls_context *tls_ctx)
2577 struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(tls_ctx);
2579 write_lock_bh(&sk->sk_callback_lock);
2580 rx_ctx->saved_data_ready = sk->sk_data_ready;
2581 sk->sk_data_ready = tls_data_ready;
2582 write_unlock_bh(&sk->sk_callback_lock);
2585 void tls_update_rx_zc_capable(struct tls_context *tls_ctx)
2587 struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(tls_ctx);
2589 rx_ctx->zc_capable = tls_ctx->rx_no_pad ||
2590 tls_ctx->prot_info.version != TLS_1_3_VERSION;
2593 static struct tls_sw_context_tx *init_ctx_tx(struct tls_context *ctx, struct sock *sk)
2595 struct tls_sw_context_tx *sw_ctx_tx;
2597 if (!ctx->priv_ctx_tx) {
2598 sw_ctx_tx = kzalloc(sizeof(*sw_ctx_tx), GFP_KERNEL);
2602 sw_ctx_tx = ctx->priv_ctx_tx;
2605 crypto_init_wait(&sw_ctx_tx->async_wait);
2606 spin_lock_init(&sw_ctx_tx->encrypt_compl_lock);
2607 INIT_LIST_HEAD(&sw_ctx_tx->tx_list);
2608 INIT_DELAYED_WORK(&sw_ctx_tx->tx_work.work, tx_work_handler);
2609 sw_ctx_tx->tx_work.sk = sk;
2614 static struct tls_sw_context_rx *init_ctx_rx(struct tls_context *ctx)
2616 struct tls_sw_context_rx *sw_ctx_rx;
2618 if (!ctx->priv_ctx_rx) {
2619 sw_ctx_rx = kzalloc(sizeof(*sw_ctx_rx), GFP_KERNEL);
2623 sw_ctx_rx = ctx->priv_ctx_rx;
2626 crypto_init_wait(&sw_ctx_rx->async_wait);
2627 spin_lock_init(&sw_ctx_rx->decrypt_compl_lock);
2628 init_waitqueue_head(&sw_ctx_rx->wq);
2629 skb_queue_head_init(&sw_ctx_rx->rx_list);
2630 skb_queue_head_init(&sw_ctx_rx->async_hold);
2635 int init_prot_info(struct tls_prot_info *prot,
2636 const struct tls_crypto_info *crypto_info,
2637 const struct tls_cipher_desc *cipher_desc)
2639 u16 nonce_size = cipher_desc->nonce;
2641 if (crypto_info->version == TLS_1_3_VERSION) {
2643 prot->aad_size = TLS_HEADER_SIZE;
2644 prot->tail_size = 1;
2646 prot->aad_size = TLS_AAD_SPACE_SIZE;
2647 prot->tail_size = 0;
2650 /* Sanity-check the sizes for stack allocations. */
2651 if (nonce_size > TLS_MAX_IV_SIZE || prot->aad_size > TLS_MAX_AAD_SIZE)
2654 prot->version = crypto_info->version;
2655 prot->cipher_type = crypto_info->cipher_type;
2656 prot->prepend_size = TLS_HEADER_SIZE + nonce_size;
2657 prot->tag_size = cipher_desc->tag;
2658 prot->overhead_size = prot->prepend_size + prot->tag_size + prot->tail_size;
2659 prot->iv_size = cipher_desc->iv;
2660 prot->salt_size = cipher_desc->salt;
2661 prot->rec_seq_size = cipher_desc->rec_seq;
2666 int tls_set_sw_offload(struct sock *sk, int tx)
2668 struct tls_sw_context_tx *sw_ctx_tx = NULL;
2669 struct tls_sw_context_rx *sw_ctx_rx = NULL;
2670 const struct tls_cipher_desc *cipher_desc;
2671 struct tls_crypto_info *crypto_info;
2672 char *iv, *rec_seq, *key, *salt;
2673 struct cipher_context *cctx;
2674 struct tls_prot_info *prot;
2675 struct crypto_aead **aead;
2676 struct tls_context *ctx;
2677 struct crypto_tfm *tfm;
2680 ctx = tls_get_ctx(sk);
2681 prot = &ctx->prot_info;
2684 ctx->priv_ctx_tx = init_ctx_tx(ctx, sk);
2685 if (!ctx->priv_ctx_tx)
2688 sw_ctx_tx = ctx->priv_ctx_tx;
2689 crypto_info = &ctx->crypto_send.info;
2691 aead = &sw_ctx_tx->aead_send;
2693 ctx->priv_ctx_rx = init_ctx_rx(ctx);
2694 if (!ctx->priv_ctx_rx)
2697 sw_ctx_rx = ctx->priv_ctx_rx;
2698 crypto_info = &ctx->crypto_recv.info;
2700 aead = &sw_ctx_rx->aead_recv;
2703 cipher_desc = get_cipher_desc(crypto_info->cipher_type);
2709 rc = init_prot_info(prot, crypto_info, cipher_desc);
2713 iv = crypto_info_iv(crypto_info, cipher_desc);
2714 key = crypto_info_key(crypto_info, cipher_desc);
2715 salt = crypto_info_salt(crypto_info, cipher_desc);
2716 rec_seq = crypto_info_rec_seq(crypto_info, cipher_desc);
2718 memcpy(cctx->iv, salt, cipher_desc->salt);
2719 memcpy(cctx->iv + cipher_desc->salt, iv, cipher_desc->iv);
2720 memcpy(cctx->rec_seq, rec_seq, cipher_desc->rec_seq);
2723 *aead = crypto_alloc_aead(cipher_desc->cipher_name, 0, 0);
2724 if (IS_ERR(*aead)) {
2725 rc = PTR_ERR(*aead);
2731 ctx->push_pending_record = tls_sw_push_pending_record;
2733 rc = crypto_aead_setkey(*aead, key, cipher_desc->key);
2737 rc = crypto_aead_setauthsize(*aead, prot->tag_size);
2742 tfm = crypto_aead_tfm(sw_ctx_rx->aead_recv);
2744 tls_update_rx_zc_capable(ctx);
2745 sw_ctx_rx->async_capable =
2746 crypto_info->version != TLS_1_3_VERSION &&
2747 !!(tfm->__crt_alg->cra_flags & CRYPTO_ALG_ASYNC);
2749 rc = tls_strp_init(&sw_ctx_rx->strp, sk);
2757 crypto_free_aead(*aead);
2761 kfree(ctx->priv_ctx_tx);
2762 ctx->priv_ctx_tx = NULL;
2764 kfree(ctx->priv_ctx_rx);
2765 ctx->priv_ctx_rx = NULL;