net/tls/tls_sw.c

   1 /*
   2  * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
   3  * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
   4  * 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
   8  *
   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:
  14  *
  15  *     Redistribution and use in source and binary forms, with or
  16  *     without modification, are permitted provided that the following
  17  *     conditions are met:
  18  *
  19  *      - Redistributions of source code must retain the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer.
  22  *
  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.
  27  *
  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
  35  * SOFTWARE.
  36  */
  37
  38 #include <linux/bug.h>
  39 #include <linux/sched/signal.h>
  40 #include <linux/module.h>
  41 #include <linux/splice.h>
  42 #include <crypto/aead.h>
  43
  44 #include <net/strparser.h>
  45 #include <net/tls.h>
  46
  47 struct tls_decrypt_arg {
  48         bool zc;
  49         bool async;
  50 };
  51
  52 noinline void tls_err_abort(struct sock *sk, int err)
  53 {
  54         WARN_ON_ONCE(err >= 0);
  55         /* sk->sk_err should contain a positive error code. */
  56         sk->sk_err = -err;
  57         sk_error_report(sk);
  58 }
  59
  60 static int __skb_nsg(struct sk_buff *skb, int offset, int len,
  61                      unsigned int recursion_level)
  62 {
  63         int start = skb_headlen(skb);
  64         int i, chunk = start - offset;
  65         struct sk_buff *frag_iter;
  66         int elt = 0;
  67
  68         if (unlikely(recursion_level >= 24))
  69                 return -EMSGSIZE;
  70
  71         if (chunk > 0) {
  72                 if (chunk > len)
  73                         chunk = len;
  74                 elt++;
  75                 len -= chunk;
  76                 if (len == 0)
  77                         return elt;
  78                 offset += chunk;
  79         }
  80
  81         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
  82                 int end;
  83
  84                 WARN_ON(start > offset + len);
  85
  86                 end = start + skb_frag_size(&skb_shinfo(skb)->frags[i]);
  87                 chunk = end - offset;
  88                 if (chunk > 0) {
  89                         if (chunk > len)
  90                                 chunk = len;
  91                         elt++;
  92                         len -= chunk;
  93                         if (len == 0)
  94                                 return elt;
  95                         offset += chunk;
  96                 }
  97                 start = end;
  98         }
  99
 100         if (unlikely(skb_has_frag_list(skb))) {
 101                 skb_walk_frags(skb, frag_iter) {
 102                         int end, ret;
 103
 104                         WARN_ON(start > offset + len);
 105
 106                         end = start + frag_iter->len;
 107                         chunk = end - offset;
 108                         if (chunk > 0) {
 109                                 if (chunk > len)
 110                                         chunk = len;
 111                                 ret = __skb_nsg(frag_iter, offset - start, chunk,
 112                                                 recursion_level + 1);
 113                                 if (unlikely(ret < 0))
 114                                         return ret;
 115                                 elt += ret;
 116                                 len -= chunk;
 117                                 if (len == 0)
 118                                         return elt;
 119                                 offset += chunk;
 120                         }
 121                         start = end;
 122                 }
 123         }
 124         BUG_ON(len);
 125         return elt;
 126 }
 127
 128 /* Return the number of scatterlist elements required to completely map the
 129  * skb, or -EMSGSIZE if the recursion depth is exceeded.
 130  */
 131 static int skb_nsg(struct sk_buff *skb, int offset, int len)
 132 {
 133         return __skb_nsg(skb, offset, len, 0);
 134 }
 135
 136 static int padding_length(struct tls_prot_info *prot, struct sk_buff *skb)
 137 {
 138         struct strp_msg *rxm = strp_msg(skb);
 139         struct tls_msg *tlm = tls_msg(skb);
 140         int sub = 0;
 141
 142         /* Determine zero-padding length */
 143         if (prot->version == TLS_1_3_VERSION) {
 144                 int offset = rxm->full_len - TLS_TAG_SIZE - 1;
 145                 char content_type = 0;
 146                 int err;
 147
 148                 while (content_type == 0) {
 149                         if (offset < prot->prepend_size)
 150                                 return -EBADMSG;
 151                         err = skb_copy_bits(skb, rxm->offset + offset,
 152                                             &content_type, 1);
 153                         if (err)
 154                                 return err;
 155                         if (content_type)
 156                                 break;
 157                         sub++;
 158                         offset--;
 159                 }
 160                 tlm->control = content_type;
 161         }
 162         return sub;
 163 }
 164
 165 static void tls_decrypt_done(struct crypto_async_request *req, int err)
 166 {
 167         struct aead_request *aead_req = (struct aead_request *)req;
 168         struct scatterlist *sgout = aead_req->dst;
 169         struct scatterlist *sgin = aead_req->src;
 170         struct tls_sw_context_rx *ctx;
 171         struct tls_context *tls_ctx;
 172         struct tls_prot_info *prot;
 173         struct scatterlist *sg;
 174         struct sk_buff *skb;
 175         unsigned int pages;
 176
 177         skb = (struct sk_buff *)req->data;
 178         tls_ctx = tls_get_ctx(skb->sk);
 179         ctx = tls_sw_ctx_rx(tls_ctx);
 180         prot = &tls_ctx->prot_info;
 181
 182         /* Propagate if there was an err */
 183         if (err) {
 184                 if (err == -EBADMSG)
 185                         TLS_INC_STATS(sock_net(skb->sk),
 186                                       LINUX_MIB_TLSDECRYPTERROR);
 187                 ctx->async_wait.err = err;
 188                 tls_err_abort(skb->sk, err);
 189         } else {
 190                 struct strp_msg *rxm = strp_msg(skb);
 191
 192                 /* No TLS 1.3 support with async crypto */
 193                 WARN_ON(prot->tail_size);
 194
 195                 rxm->offset += prot->prepend_size;
 196                 rxm->full_len -= prot->overhead_size;
 197         }
 198
 199         /* After using skb->sk to propagate sk through crypto async callback
 200          * we need to NULL it again.
 201          */
 202         skb->sk = NULL;
 203
 204
 205         /* Free the destination pages if skb was not decrypted inplace */
 206         if (sgout != sgin) {
 207                 /* Skip the first S/G entry as it points to AAD */
 208                 for_each_sg(sg_next(sgout), sg, UINT_MAX, pages) {
 209                         if (!sg)
 210                                 break;
 211                         put_page(sg_page(sg));
 212                 }
 213         }
 214
 215         kfree(aead_req);
 216
 217         spin_lock_bh(&ctx->decrypt_compl_lock);
 218         if (!atomic_dec_return(&ctx->decrypt_pending))
 219                 complete(&ctx->async_wait.completion);
 220         spin_unlock_bh(&ctx->decrypt_compl_lock);
 221 }
 222
 223 static int tls_do_decryption(struct sock *sk,
 224                              struct sk_buff *skb,
 225                              struct scatterlist *sgin,
 226                              struct scatterlist *sgout,
 227                              char *iv_recv,
 228                              size_t data_len,
 229                              struct aead_request *aead_req,
 230                              struct tls_decrypt_arg *darg)
 231 {
 232         struct tls_context *tls_ctx = tls_get_ctx(sk);
 233         struct tls_prot_info *prot = &tls_ctx->prot_info;
 234         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 235         int ret;
 236
 237         aead_request_set_tfm(aead_req, ctx->aead_recv);
 238         aead_request_set_ad(aead_req, prot->aad_size);
 239         aead_request_set_crypt(aead_req, sgin, sgout,
 240                                data_len + prot->tag_size,
 241                                (u8 *)iv_recv);
 242
 243         if (darg->async) {
 244                 /* Using skb->sk to push sk through to crypto async callback
 245                  * handler. This allows propagating errors up to the socket
 246                  * if needed. It _must_ be cleared in the async handler
 247                  * before consume_skb is called. We _know_ skb->sk is NULL
 248                  * because it is a clone from strparser.
 249                  */
 250                 skb->sk = sk;
 251                 aead_request_set_callback(aead_req,
 252                                           CRYPTO_TFM_REQ_MAY_BACKLOG,
 253                                           tls_decrypt_done, skb);
 254                 atomic_inc(&ctx->decrypt_pending);
 255         } else {
 256                 aead_request_set_callback(aead_req,
 257                                           CRYPTO_TFM_REQ_MAY_BACKLOG,
 258                                           crypto_req_done, &ctx->async_wait);
 259         }
 260
 261         ret = crypto_aead_decrypt(aead_req);
 262         if (ret == -EINPROGRESS) {
 263                 if (darg->async)
 264                         return 0;
 265
 266                 ret = crypto_wait_req(ret, &ctx->async_wait);
 267         }
 268         darg->async = false;
 269
 270         return ret;
 271 }
 272
 273 static void tls_trim_both_msgs(struct sock *sk, int target_size)
 274 {
 275         struct tls_context *tls_ctx = tls_get_ctx(sk);
 276         struct tls_prot_info *prot = &tls_ctx->prot_info;
 277         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 278         struct tls_rec *rec = ctx->open_rec;
 279
 280         sk_msg_trim(sk, &rec->msg_plaintext, target_size);
 281         if (target_size > 0)
 282                 target_size += prot->overhead_size;
 283         sk_msg_trim(sk, &rec->msg_encrypted, target_size);
 284 }
 285
 286 static int tls_alloc_encrypted_msg(struct sock *sk, int len)
 287 {
 288         struct tls_context *tls_ctx = tls_get_ctx(sk);
 289         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 290         struct tls_rec *rec = ctx->open_rec;
 291         struct sk_msg *msg_en = &rec->msg_encrypted;
 292
 293         return sk_msg_alloc(sk, msg_en, len, 0);
 294 }
 295
 296 static int tls_clone_plaintext_msg(struct sock *sk, int required)
 297 {
 298         struct tls_context *tls_ctx = tls_get_ctx(sk);
 299         struct tls_prot_info *prot = &tls_ctx->prot_info;
 300         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 301         struct tls_rec *rec = ctx->open_rec;
 302         struct sk_msg *msg_pl = &rec->msg_plaintext;
 303         struct sk_msg *msg_en = &rec->msg_encrypted;
 304         int skip, len;
 305
 306         /* We add page references worth len bytes from encrypted sg
 307          * at the end of plaintext sg. It is guaranteed that msg_en
 308          * has enough required room (ensured by caller).
 309          */
 310         len = required - msg_pl->sg.size;
 311
 312         /* Skip initial bytes in msg_en's data to be able to use
 313          * same offset of both plain and encrypted data.
 314          */
 315         skip = prot->prepend_size + msg_pl->sg.size;
 316
 317         return sk_msg_clone(sk, msg_pl, msg_en, skip, len);
 318 }
 319
 320 static struct tls_rec *tls_get_rec(struct sock *sk)
 321 {
 322         struct tls_context *tls_ctx = tls_get_ctx(sk);
 323         struct tls_prot_info *prot = &tls_ctx->prot_info;
 324         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 325         struct sk_msg *msg_pl, *msg_en;
 326         struct tls_rec *rec;
 327         int mem_size;
 328
 329         mem_size = sizeof(struct tls_rec) + crypto_aead_reqsize(ctx->aead_send);
 330
 331         rec = kzalloc(mem_size, sk->sk_allocation);
 332         if (!rec)
 333                 return NULL;
 334
 335         msg_pl = &rec->msg_plaintext;
 336         msg_en = &rec->msg_encrypted;
 337
 338         sk_msg_init(msg_pl);
 339         sk_msg_init(msg_en);
 340
 341         sg_init_table(rec->sg_aead_in, 2);
 342         sg_set_buf(&rec->sg_aead_in[0], rec->aad_space, prot->aad_size);
 343         sg_unmark_end(&rec->sg_aead_in[1]);
 344
 345         sg_init_table(rec->sg_aead_out, 2);
 346         sg_set_buf(&rec->sg_aead_out[0], rec->aad_space, prot->aad_size);
 347         sg_unmark_end(&rec->sg_aead_out[1]);
 348
 349         return rec;
 350 }
 351
 352 static void tls_free_rec(struct sock *sk, struct tls_rec *rec)
 353 {
 354         sk_msg_free(sk, &rec->msg_encrypted);
 355         sk_msg_free(sk, &rec->msg_plaintext);
 356         kfree(rec);
 357 }
 358
 359 static void tls_free_open_rec(struct sock *sk)
 360 {
 361         struct tls_context *tls_ctx = tls_get_ctx(sk);
 362         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 363         struct tls_rec *rec = ctx->open_rec;
 364
 365         if (rec) {
 366                 tls_free_rec(sk, rec);
 367                 ctx->open_rec = NULL;
 368         }
 369 }
 370
 371 int tls_tx_records(struct sock *sk, int flags)
 372 {
 373         struct tls_context *tls_ctx = tls_get_ctx(sk);
 374         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 375         struct tls_rec *rec, *tmp;
 376         struct sk_msg *msg_en;
 377         int tx_flags, rc = 0;
 378
 379         if (tls_is_partially_sent_record(tls_ctx)) {
 380                 rec = list_first_entry(&ctx->tx_list,
 381                                        struct tls_rec, list);
 382
 383                 if (flags == -1)
 384                         tx_flags = rec->tx_flags;
 385                 else
 386                         tx_flags = flags;
 387
 388                 rc = tls_push_partial_record(sk, tls_ctx, tx_flags);
 389                 if (rc)
 390                         goto tx_err;
 391
 392                 /* Full record has been transmitted.
 393                  * Remove the head of tx_list
 394                  */
 395                 list_del(&rec->list);
 396                 sk_msg_free(sk, &rec->msg_plaintext);
 397                 kfree(rec);
 398         }
 399
 400         /* Tx all ready records */
 401         list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) {
 402                 if (READ_ONCE(rec->tx_ready)) {
 403                         if (flags == -1)
 404                                 tx_flags = rec->tx_flags;
 405                         else
 406                                 tx_flags = flags;
 407
 408                         msg_en = &rec->msg_encrypted;
 409                         rc = tls_push_sg(sk, tls_ctx,
 410                                          &msg_en->sg.data[msg_en->sg.curr],
 411                                          0, tx_flags);
 412                         if (rc)
 413                                 goto tx_err;
 414
 415                         list_del(&rec->list);
 416                         sk_msg_free(sk, &rec->msg_plaintext);
 417                         kfree(rec);
 418                 } else {
 419                         break;
 420                 }
 421         }
 422
 423 tx_err:
 424         if (rc < 0 && rc != -EAGAIN)
 425                 tls_err_abort(sk, -EBADMSG);
 426
 427         return rc;
 428 }
 429
 430 static void tls_encrypt_done(struct crypto_async_request *req, int err)
 431 {
 432         struct aead_request *aead_req = (struct aead_request *)req;
 433         struct sock *sk = req->data;
 434         struct tls_context *tls_ctx = tls_get_ctx(sk);
 435         struct tls_prot_info *prot = &tls_ctx->prot_info;
 436         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 437         struct scatterlist *sge;
 438         struct sk_msg *msg_en;
 439         struct tls_rec *rec;
 440         bool ready = false;
 441         int pending;
 442
 443         rec = container_of(aead_req, struct tls_rec, aead_req);
 444         msg_en = &rec->msg_encrypted;
 445
 446         sge = sk_msg_elem(msg_en, msg_en->sg.curr);
 447         sge->offset -= prot->prepend_size;
 448         sge->length += prot->prepend_size;
 449
 450         /* Check if error is previously set on socket */
 451         if (err || sk->sk_err) {
 452                 rec = NULL;
 453
 454                 /* If err is already set on socket, return the same code */
 455                 if (sk->sk_err) {
 456                         ctx->async_wait.err = -sk->sk_err;
 457                 } else {
 458                         ctx->async_wait.err = err;
 459                         tls_err_abort(sk, err);
 460                 }
 461         }
 462
 463         if (rec) {
 464                 struct tls_rec *first_rec;
 465
 466                 /* Mark the record as ready for transmission */
 467                 smp_store_mb(rec->tx_ready, true);
 468
 469                 /* If received record is at head of tx_list, schedule tx */
 470                 first_rec = list_first_entry(&ctx->tx_list,
 471                                              struct tls_rec, list);
 472                 if (rec == first_rec)
 473                         ready = true;
 474         }
 475
 476         spin_lock_bh(&ctx->encrypt_compl_lock);
 477         pending = atomic_dec_return(&ctx->encrypt_pending);
 478
 479         if (!pending && ctx->async_notify)
 480                 complete(&ctx->async_wait.completion);
 481         spin_unlock_bh(&ctx->encrypt_compl_lock);
 482
 483         if (!ready)
 484                 return;
 485
 486         /* Schedule the transmission */
 487         if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask))
 488                 schedule_delayed_work(&ctx->tx_work.work, 1);
 489 }
 490
 491 static int tls_do_encryption(struct sock *sk,
 492                              struct tls_context *tls_ctx,
 493                              struct tls_sw_context_tx *ctx,
 494                              struct aead_request *aead_req,
 495                              size_t data_len, u32 start)
 496 {
 497         struct tls_prot_info *prot = &tls_ctx->prot_info;
 498         struct tls_rec *rec = ctx->open_rec;
 499         struct sk_msg *msg_en = &rec->msg_encrypted;
 500         struct scatterlist *sge = sk_msg_elem(msg_en, start);
 501         int rc, iv_offset = 0;
 502
 503         /* For CCM based ciphers, first byte of IV is a constant */
 504         switch (prot->cipher_type) {
 505         case TLS_CIPHER_AES_CCM_128:
 506                 rec->iv_data[0] = TLS_AES_CCM_IV_B0_BYTE;
 507                 iv_offset = 1;
 508                 break;
 509         case TLS_CIPHER_SM4_CCM:
 510                 rec->iv_data[0] = TLS_SM4_CCM_IV_B0_BYTE;
 511                 iv_offset = 1;
 512                 break;
 513         }
 514
 515         memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv,
 516                prot->iv_size + prot->salt_size);
 517
 518         xor_iv_with_seq(prot, rec->iv_data + iv_offset, tls_ctx->tx.rec_seq);
 519
 520         sge->offset += prot->prepend_size;
 521         sge->length -= prot->prepend_size;
 522
 523         msg_en->sg.curr = start;
 524
 525         aead_request_set_tfm(aead_req, ctx->aead_send);
 526         aead_request_set_ad(aead_req, prot->aad_size);
 527         aead_request_set_crypt(aead_req, rec->sg_aead_in,
 528                                rec->sg_aead_out,
 529                                data_len, rec->iv_data);
 530
 531         aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
 532                                   tls_encrypt_done, sk);
 533
 534         /* Add the record in tx_list */
 535         list_add_tail((struct list_head *)&rec->list, &ctx->tx_list);
 536         atomic_inc(&ctx->encrypt_pending);
 537
 538         rc = crypto_aead_encrypt(aead_req);
 539         if (!rc || rc != -EINPROGRESS) {
 540                 atomic_dec(&ctx->encrypt_pending);
 541                 sge->offset -= prot->prepend_size;
 542                 sge->length += prot->prepend_size;
 543         }
 544
 545         if (!rc) {
 546                 WRITE_ONCE(rec->tx_ready, true);
 547         } else if (rc != -EINPROGRESS) {
 548                 list_del(&rec->list);
 549                 return rc;
 550         }
 551
 552         /* Unhook the record from context if encryption is not failure */
 553         ctx->open_rec = NULL;
 554         tls_advance_record_sn(sk, prot, &tls_ctx->tx);
 555         return rc;
 556 }
 557
 558 static int tls_split_open_record(struct sock *sk, struct tls_rec *from,
 559                                  struct tls_rec **to, struct sk_msg *msg_opl,
 560                                  struct sk_msg *msg_oen, u32 split_point,
 561                                  u32 tx_overhead_size, u32 *orig_end)
 562 {
 563         u32 i, j, bytes = 0, apply = msg_opl->apply_bytes;
 564         struct scatterlist *sge, *osge, *nsge;
 565         u32 orig_size = msg_opl->sg.size;
 566         struct scatterlist tmp = { };
 567         struct sk_msg *msg_npl;
 568         struct tls_rec *new;
 569         int ret;
 570
 571         new = tls_get_rec(sk);
 572         if (!new)
 573                 return -ENOMEM;
 574         ret = sk_msg_alloc(sk, &new->msg_encrypted, msg_opl->sg.size +
 575                            tx_overhead_size, 0);
 576         if (ret < 0) {
 577                 tls_free_rec(sk, new);
 578                 return ret;
 579         }
 580
 581         *orig_end = msg_opl->sg.end;
 582         i = msg_opl->sg.start;
 583         sge = sk_msg_elem(msg_opl, i);
 584         while (apply && sge->length) {
 585                 if (sge->length > apply) {
 586                         u32 len = sge->length - apply;
 587
 588                         get_page(sg_page(sge));
 589                         sg_set_page(&tmp, sg_page(sge), len,
 590                                     sge->offset + apply);
 591                         sge->length = apply;
 592                         bytes += apply;
 593                         apply = 0;
 594                 } else {
 595                         apply -= sge->length;
 596                         bytes += sge->length;
 597                 }
 598
 599                 sk_msg_iter_var_next(i);
 600                 if (i == msg_opl->sg.end)
 601                         break;
 602                 sge = sk_msg_elem(msg_opl, i);
 603         }
 604
 605         msg_opl->sg.end = i;
 606         msg_opl->sg.curr = i;
 607         msg_opl->sg.copybreak = 0;
 608         msg_opl->apply_bytes = 0;
 609         msg_opl->sg.size = bytes;
 610
 611         msg_npl = &new->msg_plaintext;
 612         msg_npl->apply_bytes = apply;
 613         msg_npl->sg.size = orig_size - bytes;
 614
 615         j = msg_npl->sg.start;
 616         nsge = sk_msg_elem(msg_npl, j);
 617         if (tmp.length) {
 618                 memcpy(nsge, &tmp, sizeof(*nsge));
 619                 sk_msg_iter_var_next(j);
 620                 nsge = sk_msg_elem(msg_npl, j);
 621         }
 622
 623         osge = sk_msg_elem(msg_opl, i);
 624         while (osge->length) {
 625                 memcpy(nsge, osge, sizeof(*nsge));
 626                 sg_unmark_end(nsge);
 627                 sk_msg_iter_var_next(i);
 628                 sk_msg_iter_var_next(j);
 629                 if (i == *orig_end)
 630                         break;
 631                 osge = sk_msg_elem(msg_opl, i);
 632                 nsge = sk_msg_elem(msg_npl, j);
 633         }
 634
 635         msg_npl->sg.end = j;
 636         msg_npl->sg.curr = j;
 637         msg_npl->sg.copybreak = 0;
 638
 639         *to = new;
 640         return 0;
 641 }
 642
 643 static void tls_merge_open_record(struct sock *sk, struct tls_rec *to,
 644                                   struct tls_rec *from, u32 orig_end)
 645 {
 646         struct sk_msg *msg_npl = &from->msg_plaintext;
 647         struct sk_msg *msg_opl = &to->msg_plaintext;
 648         struct scatterlist *osge, *nsge;
 649         u32 i, j;
 650
 651         i = msg_opl->sg.end;
 652         sk_msg_iter_var_prev(i);
 653         j = msg_npl->sg.start;
 654
 655         osge = sk_msg_elem(msg_opl, i);
 656         nsge = sk_msg_elem(msg_npl, j);
 657
 658         if (sg_page(osge) == sg_page(nsge) &&
 659             osge->offset + osge->length == nsge->offset) {
 660                 osge->length += nsge->length;
 661                 put_page(sg_page(nsge));
 662         }
 663
 664         msg_opl->sg.end = orig_end;
 665         msg_opl->sg.curr = orig_end;
 666         msg_opl->sg.copybreak = 0;
 667         msg_opl->apply_bytes = msg_opl->sg.size + msg_npl->sg.size;
 668         msg_opl->sg.size += msg_npl->sg.size;
 669
 670         sk_msg_free(sk, &to->msg_encrypted);
 671         sk_msg_xfer_full(&to->msg_encrypted, &from->msg_encrypted);
 672
 673         kfree(from);
 674 }
 675
 676 static int tls_push_record(struct sock *sk, int flags,
 677                            unsigned char record_type)
 678 {
 679         struct tls_context *tls_ctx = tls_get_ctx(sk);
 680         struct tls_prot_info *prot = &tls_ctx->prot_info;
 681         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 682         struct tls_rec *rec = ctx->open_rec, *tmp = NULL;
 683         u32 i, split_point, orig_end;
 684         struct sk_msg *msg_pl, *msg_en;
 685         struct aead_request *req;
 686         bool split;
 687         int rc;
 688
 689         if (!rec)
 690                 return 0;
 691
 692         msg_pl = &rec->msg_plaintext;
 693         msg_en = &rec->msg_encrypted;
 694
 695         split_point = msg_pl->apply_bytes;
 696         split = split_point && split_point < msg_pl->sg.size;
 697         if (unlikely((!split &&
 698                       msg_pl->sg.size +
 699                       prot->overhead_size > msg_en->sg.size) ||
 700                      (split &&
 701                       split_point +
 702                       prot->overhead_size > msg_en->sg.size))) {
 703                 split = true;
 704                 split_point = msg_en->sg.size;
 705         }
 706         if (split) {
 707                 rc = tls_split_open_record(sk, rec, &tmp, msg_pl, msg_en,
 708                                            split_point, prot->overhead_size,
 709                                            &orig_end);
 710                 if (rc < 0)
 711                         return rc;
 712                 /* This can happen if above tls_split_open_record allocates
 713                  * a single large encryption buffer instead of two smaller
 714                  * ones. In this case adjust pointers and continue without
 715                  * split.
 716                  */
 717                 if (!msg_pl->sg.size) {
 718                         tls_merge_open_record(sk, rec, tmp, orig_end);
 719                         msg_pl = &rec->msg_plaintext;
 720                         msg_en = &rec->msg_encrypted;
 721                         split = false;
 722                 }
 723                 sk_msg_trim(sk, msg_en, msg_pl->sg.size +
 724                             prot->overhead_size);
 725         }
 726
 727         rec->tx_flags = flags;
 728         req = &rec->aead_req;
 729
 730         i = msg_pl->sg.end;
 731         sk_msg_iter_var_prev(i);
 732
 733         rec->content_type = record_type;
 734         if (prot->version == TLS_1_3_VERSION) {
 735                 /* Add content type to end of message.  No padding added */
 736                 sg_set_buf(&rec->sg_content_type, &rec->content_type, 1);
 737                 sg_mark_end(&rec->sg_content_type);
 738                 sg_chain(msg_pl->sg.data, msg_pl->sg.end + 1,
 739                          &rec->sg_content_type);
 740         } else {
 741                 sg_mark_end(sk_msg_elem(msg_pl, i));
 742         }
 743
 744         if (msg_pl->sg.end < msg_pl->sg.start) {
 745                 sg_chain(&msg_pl->sg.data[msg_pl->sg.start],
 746                          MAX_SKB_FRAGS - msg_pl->sg.start + 1,
 747                          msg_pl->sg.data);
 748         }
 749
 750         i = msg_pl->sg.start;
 751         sg_chain(rec->sg_aead_in, 2, &msg_pl->sg.data[i]);
 752
 753         i = msg_en->sg.end;
 754         sk_msg_iter_var_prev(i);
 755         sg_mark_end(sk_msg_elem(msg_en, i));
 756
 757         i = msg_en->sg.start;
 758         sg_chain(rec->sg_aead_out, 2, &msg_en->sg.data[i]);
 759
 760         tls_make_aad(rec->aad_space, msg_pl->sg.size + prot->tail_size,
 761                      tls_ctx->tx.rec_seq, record_type, prot);
 762
 763         tls_fill_prepend(tls_ctx,
 764                          page_address(sg_page(&msg_en->sg.data[i])) +
 765                          msg_en->sg.data[i].offset,
 766                          msg_pl->sg.size + prot->tail_size,
 767                          record_type);
 768
 769         tls_ctx->pending_open_record_frags = false;
 770
 771         rc = tls_do_encryption(sk, tls_ctx, ctx, req,
 772                                msg_pl->sg.size + prot->tail_size, i);
 773         if (rc < 0) {
 774                 if (rc != -EINPROGRESS) {
 775                         tls_err_abort(sk, -EBADMSG);
 776                         if (split) {
 777                                 tls_ctx->pending_open_record_frags = true;
 778                                 tls_merge_open_record(sk, rec, tmp, orig_end);
 779                         }
 780                 }
 781                 ctx->async_capable = 1;
 782                 return rc;
 783         } else if (split) {
 784                 msg_pl = &tmp->msg_plaintext;
 785                 msg_en = &tmp->msg_encrypted;
 786                 sk_msg_trim(sk, msg_en, msg_pl->sg.size + prot->overhead_size);
 787                 tls_ctx->pending_open_record_frags = true;
 788                 ctx->open_rec = tmp;
 789         }
 790
 791         return tls_tx_records(sk, flags);
 792 }
 793
 794 static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk,
 795                                bool full_record, u8 record_type,
 796                                ssize_t *copied, int flags)
 797 {
 798         struct tls_context *tls_ctx = tls_get_ctx(sk);
 799         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 800         struct sk_msg msg_redir = { };
 801         struct sk_psock *psock;
 802         struct sock *sk_redir;
 803         struct tls_rec *rec;
 804         bool enospc, policy;
 805         int err = 0, send;
 806         u32 delta = 0;
 807
 808         policy = !(flags & MSG_SENDPAGE_NOPOLICY);
 809         psock = sk_psock_get(sk);
 810         if (!psock || !policy) {
 811                 err = tls_push_record(sk, flags, record_type);
 812                 if (err && sk->sk_err == EBADMSG) {
 813                         *copied -= sk_msg_free(sk, msg);
 814                         tls_free_open_rec(sk);
 815                         err = -sk->sk_err;
 816                 }
 817                 if (psock)
 818                         sk_psock_put(sk, psock);
 819                 return err;
 820         }
 821 more_data:
 822         enospc = sk_msg_full(msg);
 823         if (psock->eval == __SK_NONE) {
 824                 delta = msg->sg.size;
 825                 psock->eval = sk_psock_msg_verdict(sk, psock, msg);
 826                 delta -= msg->sg.size;
 827         }
 828         if (msg->cork_bytes && msg->cork_bytes > msg->sg.size &&
 829             !enospc && !full_record) {
 830                 err = -ENOSPC;
 831                 goto out_err;
 832         }
 833         msg->cork_bytes = 0;
 834         send = msg->sg.size;
 835         if (msg->apply_bytes && msg->apply_bytes < send)
 836                 send = msg->apply_bytes;
 837
 838         switch (psock->eval) {
 839         case __SK_PASS:
 840                 err = tls_push_record(sk, flags, record_type);
 841                 if (err && sk->sk_err == EBADMSG) {
 842                         *copied -= sk_msg_free(sk, msg);
 843                         tls_free_open_rec(sk);
 844                         err = -sk->sk_err;
 845                         goto out_err;
 846                 }
 847                 break;
 848         case __SK_REDIRECT:
 849                 sk_redir = psock->sk_redir;
 850                 memcpy(&msg_redir, msg, sizeof(*msg));
 851                 if (msg->apply_bytes < send)
 852                         msg->apply_bytes = 0;
 853                 else
 854                         msg->apply_bytes -= send;
 855                 sk_msg_return_zero(sk, msg, send);
 856                 msg->sg.size -= send;
 857                 release_sock(sk);
 858                 err = tcp_bpf_sendmsg_redir(sk_redir, &msg_redir, send, flags);
 859                 lock_sock(sk);
 860                 if (err < 0) {
 861                         *copied -= sk_msg_free_nocharge(sk, &msg_redir);
 862                         msg->sg.size = 0;
 863                 }
 864                 if (msg->sg.size == 0)
 865                         tls_free_open_rec(sk);
 866                 break;
 867         case __SK_DROP:
 868         default:
 869                 sk_msg_free_partial(sk, msg, send);
 870                 if (msg->apply_bytes < send)
 871                         msg->apply_bytes = 0;
 872                 else
 873                         msg->apply_bytes -= send;
 874                 if (msg->sg.size == 0)
 875                         tls_free_open_rec(sk);
 876                 *copied -= (send + delta);
 877                 err = -EACCES;
 878         }
 879
 880         if (likely(!err)) {
 881                 bool reset_eval = !ctx->open_rec;
 882
 883                 rec = ctx->open_rec;
 884                 if (rec) {
 885                         msg = &rec->msg_plaintext;
 886                         if (!msg->apply_bytes)
 887                                 reset_eval = true;
 888                 }
 889                 if (reset_eval) {
 890                         psock->eval = __SK_NONE;
 891                         if (psock->sk_redir) {
 892                                 sock_put(psock->sk_redir);
 893                                 psock->sk_redir = NULL;
 894                         }
 895                 }
 896                 if (rec)
 897                         goto more_data;
 898         }
 899  out_err:
 900         sk_psock_put(sk, psock);
 901         return err;
 902 }
 903
 904 static int tls_sw_push_pending_record(struct sock *sk, int flags)
 905 {
 906         struct tls_context *tls_ctx = tls_get_ctx(sk);
 907         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 908         struct tls_rec *rec = ctx->open_rec;
 909         struct sk_msg *msg_pl;
 910         size_t copied;
 911
 912         if (!rec)
 913                 return 0;
 914
 915         msg_pl = &rec->msg_plaintext;
 916         copied = msg_pl->sg.size;
 917         if (!copied)
 918                 return 0;
 919
 920         return bpf_exec_tx_verdict(msg_pl, sk, true, TLS_RECORD_TYPE_DATA,
 921                                    &copied, flags);
 922 }
 923
 924 int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 925 {
 926         long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
 927         struct tls_context *tls_ctx = tls_get_ctx(sk);
 928         struct tls_prot_info *prot = &tls_ctx->prot_info;
 929         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 930         bool async_capable = ctx->async_capable;
 931         unsigned char record_type = TLS_RECORD_TYPE_DATA;
 932         bool is_kvec = iov_iter_is_kvec(&msg->msg_iter);
 933         bool eor = !(msg->msg_flags & MSG_MORE);
 934         size_t try_to_copy;
 935         ssize_t copied = 0;
 936         struct sk_msg *msg_pl, *msg_en;
 937         struct tls_rec *rec;
 938         int required_size;
 939         int num_async = 0;
 940         bool full_record;
 941         int record_room;
 942         int num_zc = 0;
 943         int orig_size;
 944         int ret = 0;
 945         int pending;
 946
 947         if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
 948                                MSG_CMSG_COMPAT))
 949                 return -EOPNOTSUPP;
 950
 951         mutex_lock(&tls_ctx->tx_lock);
 952         lock_sock(sk);
 953
 954         if (unlikely(msg->msg_controllen)) {
 955                 ret = tls_proccess_cmsg(sk, msg, &record_type);
 956                 if (ret) {
 957                         if (ret == -EINPROGRESS)
 958                                 num_async++;
 959                         else if (ret != -EAGAIN)
 960                                 goto send_end;
 961                 }
 962         }
 963
 964         while (msg_data_left(msg)) {
 965                 if (sk->sk_err) {
 966                         ret = -sk->sk_err;
 967                         goto send_end;
 968                 }
 969
 970                 if (ctx->open_rec)
 971                         rec = ctx->open_rec;
 972                 else
 973                         rec = ctx->open_rec = tls_get_rec(sk);
 974                 if (!rec) {
 975                         ret = -ENOMEM;
 976                         goto send_end;
 977                 }
 978
 979                 msg_pl = &rec->msg_plaintext;
 980                 msg_en = &rec->msg_encrypted;
 981
 982                 orig_size = msg_pl->sg.size;
 983                 full_record = false;
 984                 try_to_copy = msg_data_left(msg);
 985                 record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size;
 986                 if (try_to_copy >= record_room) {
 987                         try_to_copy = record_room;
 988                         full_record = true;
 989                 }
 990
 991                 required_size = msg_pl->sg.size + try_to_copy +
 992                                 prot->overhead_size;
 993
 994                 if (!sk_stream_memory_free(sk))
 995                         goto wait_for_sndbuf;
 996
 997 alloc_encrypted:
 998                 ret = tls_alloc_encrypted_msg(sk, required_size);
 999                 if (ret) {
1000                         if (ret != -ENOSPC)
1001                                 goto wait_for_memory;
1002
1003                         /* Adjust try_to_copy according to the amount that was
1004                          * actually allocated. The difference is due
1005                          * to max sg elements limit
1006                          */
1007                         try_to_copy -= required_size - msg_en->sg.size;
1008                         full_record = true;
1009                 }
1010
1011                 if (!is_kvec && (full_record || eor) && !async_capable) {
1012                         u32 first = msg_pl->sg.end;
1013
1014                         ret = sk_msg_zerocopy_from_iter(sk, &msg->msg_iter,
1015                                                         msg_pl, try_to_copy);
1016                         if (ret)
1017                                 goto fallback_to_reg_send;
1018
1019                         num_zc++;
1020                         copied += try_to_copy;
1021
1022                         sk_msg_sg_copy_set(msg_pl, first);
1023                         ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
1024                                                   record_type, &copied,
1025                                                   msg->msg_flags);
1026                         if (ret) {
1027                                 if (ret == -EINPROGRESS)
1028                                         num_async++;
1029                                 else if (ret == -ENOMEM)
1030                                         goto wait_for_memory;
1031                                 else if (ctx->open_rec && ret == -ENOSPC)
1032                                         goto rollback_iter;
1033                                 else if (ret != -EAGAIN)
1034                                         goto send_end;
1035                         }
1036                         continue;
1037 rollback_iter:
1038                         copied -= try_to_copy;
1039                         sk_msg_sg_copy_clear(msg_pl, first);
1040                         iov_iter_revert(&msg->msg_iter,
1041                                         msg_pl->sg.size - orig_size);
1042 fallback_to_reg_send:
1043                         sk_msg_trim(sk, msg_pl, orig_size);
1044                 }
1045
1046                 required_size = msg_pl->sg.size + try_to_copy;
1047
1048                 ret = tls_clone_plaintext_msg(sk, required_size);
1049                 if (ret) {
1050                         if (ret != -ENOSPC)
1051                                 goto send_end;
1052
1053                         /* Adjust try_to_copy according to the amount that was
1054                          * actually allocated. The difference is due
1055                          * to max sg elements limit
1056                          */
1057                         try_to_copy -= required_size - msg_pl->sg.size;
1058                         full_record = true;
1059                         sk_msg_trim(sk, msg_en,
1060                                     msg_pl->sg.size + prot->overhead_size);
1061                 }
1062
1063                 if (try_to_copy) {
1064                         ret = sk_msg_memcopy_from_iter(sk, &msg->msg_iter,
1065                                                        msg_pl, try_to_copy);
1066                         if (ret < 0)
1067                                 goto trim_sgl;
1068                 }
1069
1070                 /* Open records defined only if successfully copied, otherwise
1071                  * we would trim the sg but not reset the open record frags.
1072                  */
1073                 tls_ctx->pending_open_record_frags = true;
1074                 copied += try_to_copy;
1075                 if (full_record || eor) {
1076                         ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
1077                                                   record_type, &copied,
1078                                                   msg->msg_flags);
1079                         if (ret) {
1080                                 if (ret == -EINPROGRESS)
1081                                         num_async++;
1082                                 else if (ret == -ENOMEM)
1083                                         goto wait_for_memory;
1084                                 else if (ret != -EAGAIN) {
1085                                         if (ret == -ENOSPC)
1086                                                 ret = 0;
1087                                         goto send_end;
1088                                 }
1089                         }
1090                 }
1091
1092                 continue;
1093
1094 wait_for_sndbuf:
1095                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1096 wait_for_memory:
1097                 ret = sk_stream_wait_memory(sk, &timeo);
1098                 if (ret) {
1099 trim_sgl:
1100                         if (ctx->open_rec)
1101                                 tls_trim_both_msgs(sk, orig_size);
1102                         goto send_end;
1103                 }
1104
1105                 if (ctx->open_rec && msg_en->sg.size < required_size)
1106                         goto alloc_encrypted;
1107         }
1108
1109         if (!num_async) {
1110                 goto send_end;
1111         } else if (num_zc) {
1112                 /* Wait for pending encryptions to get completed */
1113                 spin_lock_bh(&ctx->encrypt_compl_lock);
1114                 ctx->async_notify = true;
1115
1116                 pending = atomic_read(&ctx->encrypt_pending);
1117                 spin_unlock_bh(&ctx->encrypt_compl_lock);
1118                 if (pending)
1119                         crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
1120                 else
1121                         reinit_completion(&ctx->async_wait.completion);
1122
1123                 /* There can be no concurrent accesses, since we have no
1124                  * pending encrypt operations
1125                  */
1126                 WRITE_ONCE(ctx->async_notify, false);
1127
1128                 if (ctx->async_wait.err) {
1129                         ret = ctx->async_wait.err;
1130                         copied = 0;
1131                 }
1132         }
1133
1134         /* Transmit if any encryptions have completed */
1135         if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) {
1136                 cancel_delayed_work(&ctx->tx_work.work);
1137                 tls_tx_records(sk, msg->msg_flags);
1138         }
1139
1140 send_end:
1141         ret = sk_stream_error(sk, msg->msg_flags, ret);
1142
1143         release_sock(sk);
1144         mutex_unlock(&tls_ctx->tx_lock);
1145         return copied > 0 ? copied : ret;
1146 }
1147
1148 static int tls_sw_do_sendpage(struct sock *sk, struct page *page,
1149                               int offset, size_t size, int flags)
1150 {
1151         long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1152         struct tls_context *tls_ctx = tls_get_ctx(sk);
1153         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
1154         struct tls_prot_info *prot = &tls_ctx->prot_info;
1155         unsigned char record_type = TLS_RECORD_TYPE_DATA;
1156         struct sk_msg *msg_pl;
1157         struct tls_rec *rec;
1158         int num_async = 0;
1159         ssize_t copied = 0;
1160         bool full_record;
1161         int record_room;
1162         int ret = 0;
1163         bool eor;
1164
1165         eor = !(flags & MSG_SENDPAGE_NOTLAST);
1166         sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1167
1168         /* Call the sk_stream functions to manage the sndbuf mem. */
1169         while (size > 0) {
1170                 size_t copy, required_size;
1171
1172                 if (sk->sk_err) {
1173                         ret = -sk->sk_err;
1174                         goto sendpage_end;
1175                 }
1176
1177                 if (ctx->open_rec)
1178                         rec = ctx->open_rec;
1179                 else
1180                         rec = ctx->open_rec = tls_get_rec(sk);
1181                 if (!rec) {
1182                         ret = -ENOMEM;
1183                         goto sendpage_end;
1184                 }
1185
1186                 msg_pl = &rec->msg_plaintext;
1187
1188                 full_record = false;
1189                 record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size;
1190                 copy = size;
1191                 if (copy >= record_room) {
1192                         copy = record_room;
1193                         full_record = true;
1194                 }
1195
1196                 required_size = msg_pl->sg.size + copy + prot->overhead_size;
1197
1198                 if (!sk_stream_memory_free(sk))
1199                         goto wait_for_sndbuf;
1200 alloc_payload:
1201                 ret = tls_alloc_encrypted_msg(sk, required_size);
1202                 if (ret) {
1203                         if (ret != -ENOSPC)
1204                                 goto wait_for_memory;
1205
1206                         /* Adjust copy according to the amount that was
1207                          * actually allocated. The difference is due
1208                          * to max sg elements limit
1209                          */
1210                         copy -= required_size - msg_pl->sg.size;
1211                         full_record = true;
1212                 }
1213
1214                 sk_msg_page_add(msg_pl, page, copy, offset);
1215                 sk_mem_charge(sk, copy);
1216
1217                 offset += copy;
1218                 size -= copy;
1219                 copied += copy;
1220
1221                 tls_ctx->pending_open_record_frags = true;
1222                 if (full_record || eor || sk_msg_full(msg_pl)) {
1223                         ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
1224                                                   record_type, &copied, flags);
1225                         if (ret) {
1226                                 if (ret == -EINPROGRESS)
1227                                         num_async++;
1228                                 else if (ret == -ENOMEM)
1229                                         goto wait_for_memory;
1230                                 else if (ret != -EAGAIN) {
1231                                         if (ret == -ENOSPC)
1232                                                 ret = 0;
1233                                         goto sendpage_end;
1234                                 }
1235                         }
1236                 }
1237                 continue;
1238 wait_for_sndbuf:
1239                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1240 wait_for_memory:
1241                 ret = sk_stream_wait_memory(sk, &timeo);
1242                 if (ret) {
1243                         if (ctx->open_rec)
1244                                 tls_trim_both_msgs(sk, msg_pl->sg.size);
1245                         goto sendpage_end;
1246                 }
1247
1248                 if (ctx->open_rec)
1249                         goto alloc_payload;
1250         }
1251
1252         if (num_async) {
1253                 /* Transmit if any encryptions have completed */
1254                 if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) {
1255                         cancel_delayed_work(&ctx->tx_work.work);
1256                         tls_tx_records(sk, flags);
1257                 }
1258         }
1259 sendpage_end:
1260         ret = sk_stream_error(sk, flags, ret);
1261         return copied > 0 ? copied : ret;
1262 }
1263
1264 int tls_sw_sendpage_locked(struct sock *sk, struct page *page,
1265                            int offset, size_t size, int flags)
1266 {
1267         if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
1268                       MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY |
1269                       MSG_NO_SHARED_FRAGS))
1270                 return -EOPNOTSUPP;
1271
1272         return tls_sw_do_sendpage(sk, page, offset, size, flags);
1273 }
1274
1275 int tls_sw_sendpage(struct sock *sk, struct page *page,
1276                     int offset, size_t size, int flags)
1277 {
1278         struct tls_context *tls_ctx = tls_get_ctx(sk);
1279         int ret;
1280
1281         if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
1282                       MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY))
1283                 return -EOPNOTSUPP;
1284
1285         mutex_lock(&tls_ctx->tx_lock);
1286         lock_sock(sk);
1287         ret = tls_sw_do_sendpage(sk, page, offset, size, flags);
1288         release_sock(sk);
1289         mutex_unlock(&tls_ctx->tx_lock);
1290         return ret;
1291 }
1292
1293 static struct sk_buff *tls_wait_data(struct sock *sk, struct sk_psock *psock,
1294                                      bool nonblock, long timeo, int *err)
1295 {
1296         struct tls_context *tls_ctx = tls_get_ctx(sk);
1297         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1298         struct sk_buff *skb;
1299         DEFINE_WAIT_FUNC(wait, woken_wake_function);
1300
1301         while (!(skb = ctx->recv_pkt) && sk_psock_queue_empty(psock)) {
1302                 if (sk->sk_err) {
1303                         *err = sock_error(sk);
1304                         return NULL;
1305                 }
1306
1307                 if (!skb_queue_empty(&sk->sk_receive_queue)) {
1308                         __strp_unpause(&ctx->strp);
1309                         if (ctx->recv_pkt)
1310                                 return ctx->recv_pkt;
1311                 }
1312
1313                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1314                         return NULL;
1315
1316                 if (sock_flag(sk, SOCK_DONE))
1317                         return NULL;
1318
1319                 if (nonblock || !timeo) {
1320                         *err = -EAGAIN;
1321                         return NULL;
1322                 }
1323
1324                 add_wait_queue(sk_sleep(sk), &wait);
1325                 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1326                 sk_wait_event(sk, &timeo,
1327                               ctx->recv_pkt != skb ||
1328                               !sk_psock_queue_empty(psock),
1329                               &wait);
1330                 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1331                 remove_wait_queue(sk_sleep(sk), &wait);
1332
1333                 /* Handle signals */
1334                 if (signal_pending(current)) {
1335                         *err = sock_intr_errno(timeo);
1336                         return NULL;
1337                 }
1338         }
1339
1340         return skb;
1341 }
1342
1343 static int tls_setup_from_iter(struct iov_iter *from,
1344                                int length, int *pages_used,
1345                                struct scatterlist *to,
1346                                int to_max_pages)
1347 {
1348         int rc = 0, i = 0, num_elem = *pages_used, maxpages;
1349         struct page *pages[MAX_SKB_FRAGS];
1350         unsigned int size = 0;
1351         ssize_t copied, use;
1352         size_t offset;
1353
1354         while (length > 0) {
1355                 i = 0;
1356                 maxpages = to_max_pages - num_elem;
1357                 if (maxpages == 0) {
1358                         rc = -EFAULT;
1359                         goto out;
1360                 }
1361                 copied = iov_iter_get_pages(from, pages,
1362                                             length,
1363                                             maxpages, &offset);
1364                 if (copied <= 0) {
1365                         rc = -EFAULT;
1366                         goto out;
1367                 }
1368
1369                 iov_iter_advance(from, copied);
1370
1371                 length -= copied;
1372                 size += copied;
1373                 while (copied) {
1374                         use = min_t(int, copied, PAGE_SIZE - offset);
1375
1376                         sg_set_page(&to[num_elem],
1377                                     pages[i], use, offset);
1378                         sg_unmark_end(&to[num_elem]);
1379                         /* We do not uncharge memory from this API */
1380
1381                         offset = 0;
1382                         copied -= use;
1383
1384                         i++;
1385                         num_elem++;
1386                 }
1387         }
1388         /* Mark the end in the last sg entry if newly added */
1389         if (num_elem > *pages_used)
1390                 sg_mark_end(&to[num_elem - 1]);
1391 out:
1392         if (rc)
1393                 iov_iter_revert(from, size);
1394         *pages_used = num_elem;
1395
1396         return rc;
1397 }
1398
1399 /* This function decrypts the input skb into either out_iov or in out_sg
1400  * or in skb buffers itself. The input parameter 'zc' indicates if
1401  * zero-copy mode needs to be tried or not. With zero-copy mode, either
1402  * out_iov or out_sg must be non-NULL. In case both out_iov and out_sg are
1403  * NULL, then the decryption happens inside skb buffers itself, i.e.
1404  * zero-copy gets disabled and 'zc' is updated.
1405  */
1406
1407 static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
1408                             struct iov_iter *out_iov,
1409                             struct scatterlist *out_sg,
1410                             struct tls_decrypt_arg *darg)
1411 {
1412         struct tls_context *tls_ctx = tls_get_ctx(sk);
1413         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1414         struct tls_prot_info *prot = &tls_ctx->prot_info;
1415         struct strp_msg *rxm = strp_msg(skb);
1416         struct tls_msg *tlm = tls_msg(skb);
1417         int n_sgin, n_sgout, nsg, mem_size, aead_size, err, pages = 0;
1418         struct aead_request *aead_req;
1419         struct sk_buff *unused;
1420         u8 *aad, *iv, *mem = NULL;
1421         struct scatterlist *sgin = NULL;
1422         struct scatterlist *sgout = NULL;
1423         const int data_len = rxm->full_len - prot->overhead_size +
1424                              prot->tail_size;
1425         int iv_offset = 0;
1426
1427         if (darg->zc && (out_iov || out_sg)) {
1428                 if (out_iov)
1429                         n_sgout = 1 +
1430                                 iov_iter_npages_cap(out_iov, INT_MAX, data_len);
1431                 else
1432                         n_sgout = sg_nents(out_sg);
1433                 n_sgin = skb_nsg(skb, rxm->offset + prot->prepend_size,
1434                                  rxm->full_len - prot->prepend_size);
1435         } else {
1436                 n_sgout = 0;
1437                 darg->zc = false;
1438                 n_sgin = skb_cow_data(skb, 0, &unused);
1439         }
1440
1441         if (n_sgin < 1)
1442                 return -EBADMSG;
1443
1444         /* Increment to accommodate AAD */
1445         n_sgin = n_sgin + 1;
1446
1447         nsg = n_sgin + n_sgout;
1448
1449         aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv);
1450         mem_size = aead_size + (nsg * sizeof(struct scatterlist));
1451         mem_size = mem_size + prot->aad_size;
1452         mem_size = mem_size + MAX_IV_SIZE;
1453
1454         /* Allocate a single block of memory which contains
1455          * aead_req || sgin[] || sgout[] || aad || iv.
1456          * This order achieves correct alignment for aead_req, sgin, sgout.
1457          */
1458         mem = kmalloc(mem_size, sk->sk_allocation);
1459         if (!mem)
1460                 return -ENOMEM;
1461
1462         /* Segment the allocated memory */
1463         aead_req = (struct aead_request *)mem;
1464         sgin = (struct scatterlist *)(mem + aead_size);
1465         sgout = sgin + n_sgin;
1466         aad = (u8 *)(sgout + n_sgout);
1467         iv = aad + prot->aad_size;
1468
1469         /* For CCM based ciphers, first byte of nonce+iv is a constant */
1470         switch (prot->cipher_type) {
1471         case TLS_CIPHER_AES_CCM_128:
1472                 iv[0] = TLS_AES_CCM_IV_B0_BYTE;
1473                 iv_offset = 1;
1474                 break;
1475         case TLS_CIPHER_SM4_CCM:
1476                 iv[0] = TLS_SM4_CCM_IV_B0_BYTE;
1477                 iv_offset = 1;
1478                 break;
1479         }
1480
1481         /* Prepare IV */
1482         if (prot->version == TLS_1_3_VERSION ||
1483             prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) {
1484                 memcpy(iv + iv_offset, tls_ctx->rx.iv,
1485                        prot->iv_size + prot->salt_size);
1486         } else {
1487                 err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
1488                                     iv + iv_offset + prot->salt_size,
1489                                     prot->iv_size);
1490                 if (err < 0) {
1491                         kfree(mem);
1492                         return err;
1493                 }
1494                 memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->salt_size);
1495         }
1496         xor_iv_with_seq(prot, iv + iv_offset, tls_ctx->rx.rec_seq);
1497
1498         /* Prepare AAD */
1499         tls_make_aad(aad, rxm->full_len - prot->overhead_size +
1500                      prot->tail_size,
1501                      tls_ctx->rx.rec_seq, tlm->control, prot);
1502
1503         /* Prepare sgin */
1504         sg_init_table(sgin, n_sgin);
1505         sg_set_buf(&sgin[0], aad, prot->aad_size);
1506         err = skb_to_sgvec(skb, &sgin[1],
1507                            rxm->offset + prot->prepend_size,
1508                            rxm->full_len - prot->prepend_size);
1509         if (err < 0) {
1510                 kfree(mem);
1511                 return err;
1512         }
1513
1514         if (n_sgout) {
1515                 if (out_iov) {
1516                         sg_init_table(sgout, n_sgout);
1517                         sg_set_buf(&sgout[0], aad, prot->aad_size);
1518
1519                         err = tls_setup_from_iter(out_iov, data_len,
1520                                                   &pages, &sgout[1],
1521                                                   (n_sgout - 1));
1522                         if (err < 0)
1523                                 goto fallback_to_reg_recv;
1524                 } else if (out_sg) {
1525                         memcpy(sgout, out_sg, n_sgout * sizeof(*sgout));
1526                 } else {
1527                         goto fallback_to_reg_recv;
1528                 }
1529         } else {
1530 fallback_to_reg_recv:
1531                 sgout = sgin;
1532                 pages = 0;
1533                 darg->zc = false;
1534         }
1535
1536         /* Prepare and submit AEAD request */
1537         err = tls_do_decryption(sk, skb, sgin, sgout, iv,
1538                                 data_len, aead_req, darg);
1539         if (darg->async)
1540                 return 0;
1541
1542         /* Release the pages in case iov was mapped to pages */
1543         for (; pages > 0; pages--)
1544                 put_page(sg_page(&sgout[pages]));
1545
1546         kfree(mem);
1547         return err;
1548 }
1549
1550 static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
1551                               struct iov_iter *dest,
1552                               struct tls_decrypt_arg *darg)
1553 {
1554         struct tls_context *tls_ctx = tls_get_ctx(sk);
1555         struct tls_prot_info *prot = &tls_ctx->prot_info;
1556         struct strp_msg *rxm = strp_msg(skb);
1557         struct tls_msg *tlm = tls_msg(skb);
1558         int pad, err;
1559
1560         if (tlm->decrypted) {
1561                 darg->zc = false;
1562                 darg->async = false;
1563                 return 0;
1564         }
1565
1566         if (tls_ctx->rx_conf == TLS_HW) {
1567                 err = tls_device_decrypted(sk, tls_ctx, skb, rxm);
1568                 if (err < 0)
1569                         return err;
1570                 if (err > 0) {
1571                         tlm->decrypted = 1;
1572                         darg->zc = false;
1573                         darg->async = false;
1574                         goto decrypt_done;
1575                 }
1576         }
1577
1578         err = decrypt_internal(sk, skb, dest, NULL, darg);
1579         if (err < 0) {
1580                 if (err == -EBADMSG)
1581                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSDECRYPTERROR);
1582                 return err;
1583         }
1584         if (darg->async)
1585                 goto decrypt_next;
1586
1587 decrypt_done:
1588         pad = padding_length(prot, skb);
1589         if (pad < 0)
1590                 return pad;
1591
1592         rxm->full_len -= pad;
1593         rxm->offset += prot->prepend_size;
1594         rxm->full_len -= prot->overhead_size;
1595         tlm->decrypted = 1;
1596 decrypt_next:
1597         tls_advance_record_sn(sk, prot, &tls_ctx->rx);
1598
1599         return 0;
1600 }
1601
1602 int decrypt_skb(struct sock *sk, struct sk_buff *skb,
1603                 struct scatterlist *sgout)
1604 {
1605         struct tls_decrypt_arg darg = { .zc = true, };
1606
1607         return decrypt_internal(sk, skb, NULL, sgout, &darg);
1608 }
1609
1610 static int tls_record_content_type(struct msghdr *msg, struct tls_msg *tlm,
1611                                    u8 *control)
1612 {
1613         int err;
1614
1615         if (!*control) {
1616                 *control = tlm->control;
1617                 if (!*control)
1618                         return -EBADMSG;
1619
1620                 err = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE,
1621                                sizeof(*control), control);
1622                 if (*control != TLS_RECORD_TYPE_DATA) {
1623                         if (err || msg->msg_flags & MSG_CTRUNC)
1624                                 return -EIO;
1625                 }
1626         } else if (*control != tlm->control) {
1627                 return 0;
1628         }
1629
1630         return 1;
1631 }
1632
1633 /* This function traverses the rx_list in tls receive context to copies the
1634  * decrypted records into the buffer provided by caller zero copy is not
1635  * true. Further, the records are removed from the rx_list if it is not a peek
1636  * case and the record has been consumed completely.
1637  */
1638 static int process_rx_list(struct tls_sw_context_rx *ctx,
1639                            struct msghdr *msg,
1640                            u8 *control,
1641                            size_t skip,
1642                            size_t len,
1643                            bool zc,
1644                            bool is_peek)
1645 {
1646         struct sk_buff *skb = skb_peek(&ctx->rx_list);
1647         struct tls_msg *tlm;
1648         ssize_t copied = 0;
1649         int err;
1650
1651         while (skip && skb) {
1652                 struct strp_msg *rxm = strp_msg(skb);
1653                 tlm = tls_msg(skb);
1654
1655                 err = tls_record_content_type(msg, tlm, control);
1656                 if (err <= 0)
1657                         goto out;
1658
1659                 if (skip < rxm->full_len)
1660                         break;
1661
1662                 skip = skip - rxm->full_len;
1663                 skb = skb_peek_next(skb, &ctx->rx_list);
1664         }
1665
1666         while (len && skb) {
1667                 struct sk_buff *next_skb;
1668                 struct strp_msg *rxm = strp_msg(skb);
1669                 int chunk = min_t(unsigned int, rxm->full_len - skip, len);
1670
1671                 tlm = tls_msg(skb);
1672
1673                 err = tls_record_content_type(msg, tlm, control);
1674                 if (err <= 0)
1675                         goto out;
1676
1677                 if (!zc || (rxm->full_len - skip) > len) {
1678                         err = skb_copy_datagram_msg(skb, rxm->offset + skip,
1679                                                     msg, chunk);
1680                         if (err < 0)
1681                                 goto out;
1682                 }
1683
1684                 len = len - chunk;
1685                 copied = copied + chunk;
1686
1687                 /* Consume the data from record if it is non-peek case*/
1688                 if (!is_peek) {
1689                         rxm->offset = rxm->offset + chunk;
1690                         rxm->full_len = rxm->full_len - chunk;
1691
1692                         /* Return if there is unconsumed data in the record */
1693                         if (rxm->full_len - skip)
1694                                 break;
1695                 }
1696
1697                 /* The remaining skip-bytes must lie in 1st record in rx_list.
1698                  * So from the 2nd record, 'skip' should be 0.
1699                  */
1700                 skip = 0;
1701
1702                 if (msg)
1703                         msg->msg_flags |= MSG_EOR;
1704
1705                 next_skb = skb_peek_next(skb, &ctx->rx_list);
1706
1707                 if (!is_peek) {
1708                         __skb_unlink(skb, &ctx->rx_list);
1709                         consume_skb(skb);
1710                 }
1711
1712                 skb = next_skb;
1713         }
1714         err = 0;
1715
1716 out:
1717         return copied ? : err;
1718 }
1719
1720 int tls_sw_recvmsg(struct sock *sk,
1721                    struct msghdr *msg,
1722                    size_t len,
1723                    int flags,
1724                    int *addr_len)
1725 {
1726         struct tls_context *tls_ctx = tls_get_ctx(sk);
1727         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1728         struct tls_prot_info *prot = &tls_ctx->prot_info;
1729         struct sk_psock *psock;
1730         unsigned char control = 0;
1731         ssize_t decrypted = 0;
1732         struct strp_msg *rxm;
1733         struct tls_msg *tlm;
1734         struct sk_buff *skb;
1735         ssize_t copied = 0;
1736         bool async = false;
1737         int target, err = 0;
1738         long timeo;
1739         bool is_kvec = iov_iter_is_kvec(&msg->msg_iter);
1740         bool is_peek = flags & MSG_PEEK;
1741         bool bpf_strp_enabled;
1742         bool zc_capable;
1743
1744         if (unlikely(flags & MSG_ERRQUEUE))
1745                 return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR);
1746
1747         psock = sk_psock_get(sk);
1748         lock_sock(sk);
1749         bpf_strp_enabled = sk_psock_strp_enabled(psock);
1750
1751         /* If crypto failed the connection is broken */
1752         err = ctx->async_wait.err;
1753         if (err)
1754                 goto end;
1755
1756         /* Process pending decrypted records. It must be non-zero-copy */
1757         err = process_rx_list(ctx, msg, &control, 0, len, false, is_peek);
1758         if (err < 0)
1759                 goto end;
1760
1761         copied = err;
1762         if (len <= copied)
1763                 goto end;
1764
1765         target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
1766         len = len - copied;
1767         timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1768
1769         zc_capable = !bpf_strp_enabled && !is_kvec && !is_peek &&
1770                      prot->version != TLS_1_3_VERSION;
1771         decrypted = 0;
1772         while (len && (decrypted + copied < target || ctx->recv_pkt)) {
1773                 struct tls_decrypt_arg darg = {};
1774                 int to_decrypt, chunk;
1775
1776                 skb = tls_wait_data(sk, psock, flags & MSG_DONTWAIT, timeo, &err);
1777                 if (!skb) {
1778                         if (psock) {
1779                                 chunk = sk_msg_recvmsg(sk, psock, msg, len,
1780                                                        flags);
1781                                 if (chunk > 0)
1782                                         goto leave_on_list;
1783                         }
1784                         goto recv_end;
1785                 }
1786
1787                 rxm = strp_msg(skb);
1788                 tlm = tls_msg(skb);
1789
1790                 to_decrypt = rxm->full_len - prot->overhead_size;
1791
1792                 if (zc_capable && to_decrypt <= len &&
1793                     tlm->control == TLS_RECORD_TYPE_DATA)
1794                         darg.zc = true;
1795
1796                 /* Do not use async mode if record is non-data */
1797                 if (tlm->control == TLS_RECORD_TYPE_DATA && !bpf_strp_enabled)
1798                         darg.async = ctx->async_capable;
1799                 else
1800                         darg.async = false;
1801
1802                 err = decrypt_skb_update(sk, skb, &msg->msg_iter, &darg);
1803                 if (err < 0) {
1804                         tls_err_abort(sk, -EBADMSG);
1805                         goto recv_end;
1806                 }
1807
1808                 async |= darg.async;
1809
1810                 /* If the type of records being processed is not known yet,
1811                  * set it to record type just dequeued. If it is already known,
1812                  * but does not match the record type just dequeued, go to end.
1813                  * We always get record type here since for tls1.2, record type
1814                  * is known just after record is dequeued from stream parser.
1815                  * For tls1.3, we disable async.
1816                  */
1817                 err = tls_record_content_type(msg, tlm, &control);
1818                 if (err <= 0)
1819                         goto recv_end;
1820
1821                 ctx->recv_pkt = NULL;
1822                 __strp_unpause(&ctx->strp);
1823                 __skb_queue_tail(&ctx->rx_list, skb);
1824
1825                 if (async) {
1826                         /* TLS 1.2-only, to_decrypt must be text length */
1827                         chunk = min_t(int, to_decrypt, len);
1828 leave_on_list:
1829                         decrypted += chunk;
1830                         len -= chunk;
1831                         continue;
1832                 }
1833                 /* TLS 1.3 may have updated the length by more than overhead */
1834                 chunk = rxm->full_len;
1835
1836                 if (!darg.zc) {
1837                         bool partially_consumed = chunk > len;
1838
1839                         if (bpf_strp_enabled) {
1840                                 /* BPF may try to queue the skb */
1841                                 __skb_unlink(skb, &ctx->rx_list);
1842                                 err = sk_psock_tls_strp_read(psock, skb);
1843                                 if (err != __SK_PASS) {
1844                                         rxm->offset = rxm->offset + rxm->full_len;
1845                                         rxm->full_len = 0;
1846                                         if (err == __SK_DROP)
1847                                                 consume_skb(skb);
1848                                         continue;
1849                                 }
1850                                 __skb_queue_tail(&ctx->rx_list, skb);
1851                         }
1852
1853                         if (partially_consumed)
1854                                 chunk = len;
1855
1856                         err = skb_copy_datagram_msg(skb, rxm->offset,
1857                                                     msg, chunk);
1858                         if (err < 0)
1859                                 goto recv_end;
1860
1861                         if (is_peek)
1862                                 goto leave_on_list;
1863
1864                         if (partially_consumed) {
1865                                 rxm->offset += chunk;
1866                                 rxm->full_len -= chunk;
1867                                 goto leave_on_list;
1868                         }
1869                 }
1870
1871                 decrypted += chunk;
1872                 len -= chunk;
1873
1874                 __skb_unlink(skb, &ctx->rx_list);
1875                 consume_skb(skb);
1876
1877                 /* Return full control message to userspace before trying
1878                  * to parse another message type
1879                  */
1880                 msg->msg_flags |= MSG_EOR;
1881                 if (control != TLS_RECORD_TYPE_DATA)
1882                         break;
1883         }
1884
1885 recv_end:
1886         if (async) {
1887                 int ret, pending;
1888
1889                 /* Wait for all previously submitted records to be decrypted */
1890                 spin_lock_bh(&ctx->decrypt_compl_lock);
1891                 reinit_completion(&ctx->async_wait.completion);
1892                 pending = atomic_read(&ctx->decrypt_pending);
1893                 spin_unlock_bh(&ctx->decrypt_compl_lock);
1894                 if (pending) {
1895                         ret = crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
1896                         if (ret) {
1897                                 if (err >= 0 || err == -EINPROGRESS)
1898                                         err = ret;
1899                                 decrypted = 0;
1900                                 goto end;
1901                         }
1902                 }
1903
1904                 /* Drain records from the rx_list & copy if required */
1905                 if (is_peek || is_kvec)
1906                         err = process_rx_list(ctx, msg, &control, copied,
1907                                               decrypted, false, is_peek);
1908                 else
1909                         err = process_rx_list(ctx, msg, &control, 0,
1910                                               decrypted, true, is_peek);
1911                 decrypted = max(err, 0);
1912         }
1913
1914         copied += decrypted;
1915
1916 end:
1917         release_sock(sk);
1918         if (psock)
1919                 sk_psock_put(sk, psock);
1920         return copied ? : err;
1921 }
1922
1923 ssize_t tls_sw_splice_read(struct socket *sock,  loff_t *ppos,
1924                            struct pipe_inode_info *pipe,
1925                            size_t len, unsigned int flags)
1926 {
1927         struct tls_context *tls_ctx = tls_get_ctx(sock->sk);
1928         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1929         struct strp_msg *rxm = NULL;
1930         struct sock *sk = sock->sk;
1931         struct tls_msg *tlm;
1932         struct sk_buff *skb;
1933         ssize_t copied = 0;
1934         bool from_queue;
1935         int err = 0;
1936         long timeo;
1937         int chunk;
1938
1939         lock_sock(sk);
1940
1941         timeo = sock_rcvtimeo(sk, flags & SPLICE_F_NONBLOCK);
1942
1943         from_queue = !skb_queue_empty(&ctx->rx_list);
1944         if (from_queue) {
1945                 skb = __skb_dequeue(&ctx->rx_list);
1946         } else {
1947                 struct tls_decrypt_arg darg = {};
1948
1949                 skb = tls_wait_data(sk, NULL, flags & SPLICE_F_NONBLOCK, timeo,
1950                                     &err);
1951                 if (!skb)
1952                         goto splice_read_end;
1953
1954                 err = decrypt_skb_update(sk, skb, NULL, &darg);
1955                 if (err < 0) {
1956                         tls_err_abort(sk, -EBADMSG);
1957                         goto splice_read_end;
1958                 }
1959         }
1960
1961         rxm = strp_msg(skb);
1962         tlm = tls_msg(skb);
1963
1964         /* splice does not support reading control messages */
1965         if (tlm->control != TLS_RECORD_TYPE_DATA) {
1966                 err = -EINVAL;
1967                 goto splice_read_end;
1968         }
1969
1970         chunk = min_t(unsigned int, rxm->full_len, len);
1971         copied = skb_splice_bits(skb, sk, rxm->offset, pipe, chunk, flags);
1972         if (copied < 0)
1973                 goto splice_read_end;
1974
1975         if (!from_queue) {
1976                 ctx->recv_pkt = NULL;
1977                 __strp_unpause(&ctx->strp);
1978         }
1979         if (chunk < rxm->full_len) {
1980                 __skb_queue_head(&ctx->rx_list, skb);
1981                 rxm->offset += len;
1982                 rxm->full_len -= len;
1983         } else {
1984                 consume_skb(skb);
1985         }
1986
1987 splice_read_end:
1988         release_sock(sk);
1989         return copied ? : err;
1990 }
1991
1992 bool tls_sw_sock_is_readable(struct sock *sk)
1993 {
1994         struct tls_context *tls_ctx = tls_get_ctx(sk);
1995         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1996         bool ingress_empty = true;
1997         struct sk_psock *psock;
1998
1999         rcu_read_lock();
2000         psock = sk_psock(sk);
2001         if (psock)
2002                 ingress_empty = list_empty(&psock->ingress_msg);
2003         rcu_read_unlock();
2004
2005         return !ingress_empty || ctx->recv_pkt ||
2006                 !skb_queue_empty(&ctx->rx_list);
2007 }
2008
2009 static int tls_read_size(struct strparser *strp, struct sk_buff *skb)
2010 {
2011         struct tls_context *tls_ctx = tls_get_ctx(strp->sk);
2012         struct tls_prot_info *prot = &tls_ctx->prot_info;
2013         char header[TLS_HEADER_SIZE + MAX_IV_SIZE];
2014         struct strp_msg *rxm = strp_msg(skb);
2015         struct tls_msg *tlm = tls_msg(skb);
2016         size_t cipher_overhead;
2017         size_t data_len = 0;
2018         int ret;
2019
2020         /* Verify that we have a full TLS header, or wait for more data */
2021         if (rxm->offset + prot->prepend_size > skb->len)
2022                 return 0;
2023
2024         /* Sanity-check size of on-stack buffer. */
2025         if (WARN_ON(prot->prepend_size > sizeof(header))) {
2026                 ret = -EINVAL;
2027                 goto read_failure;
2028         }
2029
2030         /* Linearize header to local buffer */
2031         ret = skb_copy_bits(skb, rxm->offset, header, prot->prepend_size);
2032         if (ret < 0)
2033                 goto read_failure;
2034
2035         tlm->decrypted = 0;
2036         tlm->control = header[0];
2037
2038         data_len = ((header[4] & 0xFF) | (header[3] << 8));
2039
2040         cipher_overhead = prot->tag_size;
2041         if (prot->version != TLS_1_3_VERSION &&
2042             prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305)
2043                 cipher_overhead += prot->iv_size;
2044
2045         if (data_len > TLS_MAX_PAYLOAD_SIZE + cipher_overhead +
2046             prot->tail_size) {
2047                 ret = -EMSGSIZE;
2048                 goto read_failure;
2049         }
2050         if (data_len < cipher_overhead) {
2051                 ret = -EBADMSG;
2052                 goto read_failure;
2053         }
2054
2055         /* Note that both TLS1.3 and TLS1.2 use TLS_1_2 version here */
2056         if (header[1] != TLS_1_2_VERSION_MINOR ||
2057             header[2] != TLS_1_2_VERSION_MAJOR) {
2058                 ret = -EINVAL;
2059                 goto read_failure;
2060         }
2061
2062         tls_device_rx_resync_new_rec(strp->sk, data_len + TLS_HEADER_SIZE,
2063                                      TCP_SKB_CB(skb)->seq + rxm->offset);
2064         return data_len + TLS_HEADER_SIZE;
2065
2066 read_failure:
2067         tls_err_abort(strp->sk, ret);
2068
2069         return ret;
2070 }
2071
2072 static void tls_queue(struct strparser *strp, struct sk_buff *skb)
2073 {
2074         struct tls_context *tls_ctx = tls_get_ctx(strp->sk);
2075         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2076
2077         ctx->recv_pkt = skb;
2078         strp_pause(strp);
2079
2080         ctx->saved_data_ready(strp->sk);
2081 }
2082
2083 static void tls_data_ready(struct sock *sk)
2084 {
2085         struct tls_context *tls_ctx = tls_get_ctx(sk);
2086         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2087         struct sk_psock *psock;
2088
2089         strp_data_ready(&ctx->strp);
2090
2091         psock = sk_psock_get(sk);
2092         if (psock) {
2093                 if (!list_empty(&psock->ingress_msg))
2094                         ctx->saved_data_ready(sk);
2095                 sk_psock_put(sk, psock);
2096         }
2097 }
2098
2099 void tls_sw_cancel_work_tx(struct tls_context *tls_ctx)
2100 {
2101         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
2102
2103         set_bit(BIT_TX_CLOSING, &ctx->tx_bitmask);
2104         set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask);
2105         cancel_delayed_work_sync(&ctx->tx_work.work);
2106 }
2107
2108 void tls_sw_release_resources_tx(struct sock *sk)
2109 {
2110         struct tls_context *tls_ctx = tls_get_ctx(sk);
2111         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
2112         struct tls_rec *rec, *tmp;
2113         int pending;
2114
2115         /* Wait for any pending async encryptions to complete */
2116         spin_lock_bh(&ctx->encrypt_compl_lock);
2117         ctx->async_notify = true;
2118         pending = atomic_read(&ctx->encrypt_pending);
2119         spin_unlock_bh(&ctx->encrypt_compl_lock);
2120
2121         if (pending)
2122                 crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
2123
2124         tls_tx_records(sk, -1);
2125
2126         /* Free up un-sent records in tx_list. First, free
2127          * the partially sent record if any at head of tx_list.
2128          */
2129         if (tls_ctx->partially_sent_record) {
2130                 tls_free_partial_record(sk, tls_ctx);
2131                 rec = list_first_entry(&ctx->tx_list,
2132                                        struct tls_rec, list);
2133                 list_del(&rec->list);
2134                 sk_msg_free(sk, &rec->msg_plaintext);
2135                 kfree(rec);
2136         }
2137
2138         list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) {
2139                 list_del(&rec->list);
2140                 sk_msg_free(sk, &rec->msg_encrypted);
2141                 sk_msg_free(sk, &rec->msg_plaintext);
2142                 kfree(rec);
2143         }
2144
2145         crypto_free_aead(ctx->aead_send);
2146         tls_free_open_rec(sk);
2147 }
2148
2149 void tls_sw_free_ctx_tx(struct tls_context *tls_ctx)
2150 {
2151         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
2152
2153         kfree(ctx);
2154 }
2155
2156 void tls_sw_release_resources_rx(struct sock *sk)
2157 {
2158         struct tls_context *tls_ctx = tls_get_ctx(sk);
2159         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2160
2161         kfree(tls_ctx->rx.rec_seq);
2162         kfree(tls_ctx->rx.iv);
2163
2164         if (ctx->aead_recv) {
2165                 kfree_skb(ctx->recv_pkt);
2166                 ctx->recv_pkt = NULL;
2167                 __skb_queue_purge(&ctx->rx_list);
2168                 crypto_free_aead(ctx->aead_recv);
2169                 strp_stop(&ctx->strp);
2170                 /* If tls_sw_strparser_arm() was not called (cleanup paths)
2171                  * we still want to strp_stop(), but sk->sk_data_ready was
2172                  * never swapped.
2173                  */
2174                 if (ctx->saved_data_ready) {
2175                         write_lock_bh(&sk->sk_callback_lock);
2176                         sk->sk_data_ready = ctx->saved_data_ready;
2177                         write_unlock_bh(&sk->sk_callback_lock);
2178                 }
2179         }
2180 }
2181
2182 void tls_sw_strparser_done(struct tls_context *tls_ctx)
2183 {
2184         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2185
2186         strp_done(&ctx->strp);
2187 }
2188
2189 void tls_sw_free_ctx_rx(struct tls_context *tls_ctx)
2190 {
2191         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2192
2193         kfree(ctx);
2194 }
2195
2196 void tls_sw_free_resources_rx(struct sock *sk)
2197 {
2198         struct tls_context *tls_ctx = tls_get_ctx(sk);
2199
2200         tls_sw_release_resources_rx(sk);
2201         tls_sw_free_ctx_rx(tls_ctx);
2202 }
2203
2204 /* The work handler to transmitt the encrypted records in tx_list */
2205 static void tx_work_handler(struct work_struct *work)
2206 {
2207         struct delayed_work *delayed_work = to_delayed_work(work);
2208         struct tx_work *tx_work = container_of(delayed_work,
2209                                                struct tx_work, work);
2210         struct sock *sk = tx_work->sk;
2211         struct tls_context *tls_ctx = tls_get_ctx(sk);
2212         struct tls_sw_context_tx *ctx;
2213
2214         if (unlikely(!tls_ctx))
2215                 return;
2216
2217         ctx = tls_sw_ctx_tx(tls_ctx);
2218         if (test_bit(BIT_TX_CLOSING, &ctx->tx_bitmask))
2219                 return;
2220
2221         if (!test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask))
2222                 return;
2223         mutex_lock(&tls_ctx->tx_lock);
2224         lock_sock(sk);
2225         tls_tx_records(sk, -1);
2226         release_sock(sk);
2227         mutex_unlock(&tls_ctx->tx_lock);
2228 }
2229
2230 void tls_sw_write_space(struct sock *sk, struct tls_context *ctx)
2231 {
2232         struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx);
2233
2234         /* Schedule the transmission if tx list is ready */
2235         if (is_tx_ready(tx_ctx) &&
2236             !test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask))
2237                 schedule_delayed_work(&tx_ctx->tx_work.work, 0);
2238 }
2239
2240 void tls_sw_strparser_arm(struct sock *sk, struct tls_context *tls_ctx)
2241 {
2242         struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(tls_ctx);
2243
2244         write_lock_bh(&sk->sk_callback_lock);
2245         rx_ctx->saved_data_ready = sk->sk_data_ready;
2246         sk->sk_data_ready = tls_data_ready;
2247         write_unlock_bh(&sk->sk_callback_lock);
2248
2249         strp_check_rcv(&rx_ctx->strp);
2250 }
2251
2252 int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
2253 {
2254         struct tls_context *tls_ctx = tls_get_ctx(sk);
2255         struct tls_prot_info *prot = &tls_ctx->prot_info;
2256         struct tls_crypto_info *crypto_info;
2257         struct tls_sw_context_tx *sw_ctx_tx = NULL;
2258         struct tls_sw_context_rx *sw_ctx_rx = NULL;
2259         struct cipher_context *cctx;
2260         struct crypto_aead **aead;
2261         struct strp_callbacks cb;
2262         u16 nonce_size, tag_size, iv_size, rec_seq_size, salt_size;
2263         struct crypto_tfm *tfm;
2264         char *iv, *rec_seq, *key, *salt, *cipher_name;
2265         size_t keysize;
2266         int rc = 0;
2267
2268         if (!ctx) {
2269                 rc = -EINVAL;
2270                 goto out;
2271         }
2272
2273         if (tx) {
2274                 if (!ctx->priv_ctx_tx) {
2275                         sw_ctx_tx = kzalloc(sizeof(*sw_ctx_tx), GFP_KERNEL);
2276                         if (!sw_ctx_tx) {
2277                                 rc = -ENOMEM;
2278                                 goto out;
2279                         }
2280                         ctx->priv_ctx_tx = sw_ctx_tx;
2281                 } else {
2282                         sw_ctx_tx =
2283                                 (struct tls_sw_context_tx *)ctx->priv_ctx_tx;
2284                 }
2285         } else {
2286                 if (!ctx->priv_ctx_rx) {
2287                         sw_ctx_rx = kzalloc(sizeof(*sw_ctx_rx), GFP_KERNEL);
2288                         if (!sw_ctx_rx) {
2289                                 rc = -ENOMEM;
2290                                 goto out;
2291                         }
2292                         ctx->priv_ctx_rx = sw_ctx_rx;
2293                 } else {
2294                         sw_ctx_rx =
2295                                 (struct tls_sw_context_rx *)ctx->priv_ctx_rx;
2296                 }
2297         }
2298
2299         if (tx) {
2300                 crypto_init_wait(&sw_ctx_tx->async_wait);
2301                 spin_lock_init(&sw_ctx_tx->encrypt_compl_lock);
2302                 crypto_info = &ctx->crypto_send.info;
2303                 cctx = &ctx->tx;
2304                 aead = &sw_ctx_tx->aead_send;
2305                 INIT_LIST_HEAD(&sw_ctx_tx->tx_list);
2306                 INIT_DELAYED_WORK(&sw_ctx_tx->tx_work.work, tx_work_handler);
2307                 sw_ctx_tx->tx_work.sk = sk;
2308         } else {
2309                 crypto_init_wait(&sw_ctx_rx->async_wait);
2310                 spin_lock_init(&sw_ctx_rx->decrypt_compl_lock);
2311                 crypto_info = &ctx->crypto_recv.info;
2312                 cctx = &ctx->rx;
2313                 skb_queue_head_init(&sw_ctx_rx->rx_list);
2314                 aead = &sw_ctx_rx->aead_recv;
2315         }
2316
2317         switch (crypto_info->cipher_type) {
2318         case TLS_CIPHER_AES_GCM_128: {
2319                 struct tls12_crypto_info_aes_gcm_128 *gcm_128_info;
2320
2321                 gcm_128_info = (void *)crypto_info;
2322                 nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
2323                 tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE;
2324                 iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
2325                 iv = gcm_128_info->iv;
2326                 rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE;
2327                 rec_seq = gcm_128_info->rec_seq;
2328                 keysize = TLS_CIPHER_AES_GCM_128_KEY_SIZE;
2329                 key = gcm_128_info->key;
2330                 salt = gcm_128_info->salt;
2331                 salt_size = TLS_CIPHER_AES_GCM_128_SALT_SIZE;
2332                 cipher_name = "gcm(aes)";
2333                 break;
2334         }
2335         case TLS_CIPHER_AES_GCM_256: {
2336                 struct tls12_crypto_info_aes_gcm_256 *gcm_256_info;
2337
2338                 gcm_256_info = (void *)crypto_info;
2339                 nonce_size = TLS_CIPHER_AES_GCM_256_IV_SIZE;
2340                 tag_size = TLS_CIPHER_AES_GCM_256_TAG_SIZE;
2341                 iv_size = TLS_CIPHER_AES_GCM_256_IV_SIZE;
2342                 iv = gcm_256_info->iv;
2343                 rec_seq_size = TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE;
2344                 rec_seq = gcm_256_info->rec_seq;
2345                 keysize = TLS_CIPHER_AES_GCM_256_KEY_SIZE;
2346                 key = gcm_256_info->key;
2347                 salt = gcm_256_info->salt;
2348                 salt_size = TLS_CIPHER_AES_GCM_256_SALT_SIZE;
2349                 cipher_name = "gcm(aes)";
2350                 break;
2351         }
2352         case TLS_CIPHER_AES_CCM_128: {
2353                 struct tls12_crypto_info_aes_ccm_128 *ccm_128_info;
2354
2355                 ccm_128_info = (void *)crypto_info;
2356                 nonce_size = TLS_CIPHER_AES_CCM_128_IV_SIZE;
2357                 tag_size = TLS_CIPHER_AES_CCM_128_TAG_SIZE;
2358                 iv_size = TLS_CIPHER_AES_CCM_128_IV_SIZE;
2359                 iv = ccm_128_info->iv;
2360                 rec_seq_size = TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE;
2361                 rec_seq = ccm_128_info->rec_seq;
2362                 keysize = TLS_CIPHER_AES_CCM_128_KEY_SIZE;
2363                 key = ccm_128_info->key;
2364                 salt = ccm_128_info->salt;
2365                 salt_size = TLS_CIPHER_AES_CCM_128_SALT_SIZE;
2366                 cipher_name = "ccm(aes)";
2367                 break;
2368         }
2369         case TLS_CIPHER_CHACHA20_POLY1305: {
2370                 struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305_info;
2371
2372                 chacha20_poly1305_info = (void *)crypto_info;
2373                 nonce_size = 0;
2374                 tag_size = TLS_CIPHER_CHACHA20_POLY1305_TAG_SIZE;
2375                 iv_size = TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE;
2376                 iv = chacha20_poly1305_info->iv;
2377                 rec_seq_size = TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE;
2378                 rec_seq = chacha20_poly1305_info->rec_seq;
2379                 keysize = TLS_CIPHER_CHACHA20_POLY1305_KEY_SIZE;
2380                 key = chacha20_poly1305_info->key;
2381                 salt = chacha20_poly1305_info->salt;
2382                 salt_size = TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE;
2383                 cipher_name = "rfc7539(chacha20,poly1305)";
2384                 break;
2385         }
2386         case TLS_CIPHER_SM4_GCM: {
2387                 struct tls12_crypto_info_sm4_gcm *sm4_gcm_info;
2388
2389                 sm4_gcm_info = (void *)crypto_info;
2390                 nonce_size = TLS_CIPHER_SM4_GCM_IV_SIZE;
2391                 tag_size = TLS_CIPHER_SM4_GCM_TAG_SIZE;
2392                 iv_size = TLS_CIPHER_SM4_GCM_IV_SIZE;
2393                 iv = sm4_gcm_info->iv;
2394                 rec_seq_size = TLS_CIPHER_SM4_GCM_REC_SEQ_SIZE;
2395                 rec_seq = sm4_gcm_info->rec_seq;
2396                 keysize = TLS_CIPHER_SM4_GCM_KEY_SIZE;
2397                 key = sm4_gcm_info->key;
2398                 salt = sm4_gcm_info->salt;
2399                 salt_size = TLS_CIPHER_SM4_GCM_SALT_SIZE;
2400                 cipher_name = "gcm(sm4)";
2401                 break;
2402         }
2403         case TLS_CIPHER_SM4_CCM: {
2404                 struct tls12_crypto_info_sm4_ccm *sm4_ccm_info;
2405
2406                 sm4_ccm_info = (void *)crypto_info;
2407                 nonce_size = TLS_CIPHER_SM4_CCM_IV_SIZE;
2408                 tag_size = TLS_CIPHER_SM4_CCM_TAG_SIZE;
2409                 iv_size = TLS_CIPHER_SM4_CCM_IV_SIZE;
2410                 iv = sm4_ccm_info->iv;
2411                 rec_seq_size = TLS_CIPHER_SM4_CCM_REC_SEQ_SIZE;
2412                 rec_seq = sm4_ccm_info->rec_seq;
2413                 keysize = TLS_CIPHER_SM4_CCM_KEY_SIZE;
2414                 key = sm4_ccm_info->key;
2415                 salt = sm4_ccm_info->salt;
2416                 salt_size = TLS_CIPHER_SM4_CCM_SALT_SIZE;
2417                 cipher_name = "ccm(sm4)";
2418                 break;
2419         }
2420         default:
2421                 rc = -EINVAL;
2422                 goto free_priv;
2423         }
2424
2425         /* Sanity-check the sizes for stack allocations. */
2426         if (iv_size > MAX_IV_SIZE || nonce_size > MAX_IV_SIZE ||
2427             rec_seq_size > TLS_MAX_REC_SEQ_SIZE || tag_size != TLS_TAG_SIZE) {
2428                 rc = -EINVAL;
2429                 goto free_priv;
2430         }
2431
2432         if (crypto_info->version == TLS_1_3_VERSION) {
2433                 nonce_size = 0;
2434                 prot->aad_size = TLS_HEADER_SIZE;
2435                 prot->tail_size = 1;
2436         } else {
2437                 prot->aad_size = TLS_AAD_SPACE_SIZE;
2438                 prot->tail_size = 0;
2439         }
2440
2441         prot->version = crypto_info->version;
2442         prot->cipher_type = crypto_info->cipher_type;
2443         prot->prepend_size = TLS_HEADER_SIZE + nonce_size;
2444         prot->tag_size = tag_size;
2445         prot->overhead_size = prot->prepend_size +
2446                               prot->tag_size + prot->tail_size;
2447         prot->iv_size = iv_size;
2448         prot->salt_size = salt_size;
2449         cctx->iv = kmalloc(iv_size + salt_size, GFP_KERNEL);
2450         if (!cctx->iv) {
2451                 rc = -ENOMEM;
2452                 goto free_priv;
2453         }
2454         /* Note: 128 & 256 bit salt are the same size */
2455         prot->rec_seq_size = rec_seq_size;
2456         memcpy(cctx->iv, salt, salt_size);
2457         memcpy(cctx->iv + salt_size, iv, iv_size);
2458         cctx->rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL);
2459         if (!cctx->rec_seq) {
2460                 rc = -ENOMEM;
2461                 goto free_iv;
2462         }
2463
2464         if (!*aead) {
2465                 *aead = crypto_alloc_aead(cipher_name, 0, 0);
2466                 if (IS_ERR(*aead)) {
2467                         rc = PTR_ERR(*aead);
2468                         *aead = NULL;
2469                         goto free_rec_seq;
2470                 }
2471         }
2472
2473         ctx->push_pending_record = tls_sw_push_pending_record;
2474
2475         rc = crypto_aead_setkey(*aead, key, keysize);
2476
2477         if (rc)
2478                 goto free_aead;
2479
2480         rc = crypto_aead_setauthsize(*aead, prot->tag_size);
2481         if (rc)
2482                 goto free_aead;
2483
2484         if (sw_ctx_rx) {
2485                 tfm = crypto_aead_tfm(sw_ctx_rx->aead_recv);
2486
2487                 if (crypto_info->version == TLS_1_3_VERSION)
2488                         sw_ctx_rx->async_capable = 0;
2489                 else
2490                         sw_ctx_rx->async_capable =
2491                                 !!(tfm->__crt_alg->cra_flags &
2492                                    CRYPTO_ALG_ASYNC);
2493
2494                 /* Set up strparser */
2495                 memset(&cb, 0, sizeof(cb));
2496                 cb.rcv_msg = tls_queue;
2497                 cb.parse_msg = tls_read_size;
2498
2499                 strp_init(&sw_ctx_rx->strp, sk, &cb);
2500         }
2501
2502         goto out;
2503
2504 free_aead:
2505         crypto_free_aead(*aead);
2506         *aead = NULL;
2507 free_rec_seq:
2508         kfree(cctx->rec_seq);
2509         cctx->rec_seq = NULL;
2510 free_iv:
2511         kfree(cctx->iv);
2512         cctx->iv = NULL;
2513 free_priv:
2514         if (tx) {
2515                 kfree(ctx->priv_ctx_tx);
2516                 ctx->priv_ctx_tx = NULL;
2517         } else {
2518                 kfree(ctx->priv_ctx_rx);
2519                 ctx->priv_ctx_rx = NULL;
2520         }
2521 out:
2522         return rc;
2523 }