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 #include "tls.h"
  48
  49 struct tls_decrypt_arg {
  50         struct_group(inargs,
  51         bool zc;
  52         bool async;
  53         u8 tail;
  54         );
  55
  56         struct sk_buff *skb;
  57 };
  58
  59 struct tls_decrypt_ctx {
  60         u8 iv[MAX_IV_SIZE];
  61         u8 aad[TLS_MAX_AAD_SIZE];
  62         u8 tail;
  63         struct scatterlist sg[];
  64 };
  65
  66 noinline void tls_err_abort(struct sock *sk, int err)
  67 {
  68         WARN_ON_ONCE(err >= 0);
  69         /* sk->sk_err should contain a positive error code. */
  70         WRITE_ONCE(sk->sk_err, -err);
  71         /* Paired with smp_rmb() in tcp_poll() */
  72         smp_wmb();
  73         sk_error_report(sk);
  74 }
  75
  76 static int __skb_nsg(struct sk_buff *skb, int offset, int len,
  77                      unsigned int recursion_level)
  78 {
  79         int start = skb_headlen(skb);
  80         int i, chunk = start - offset;
  81         struct sk_buff *frag_iter;
  82         int elt = 0;
  83
  84         if (unlikely(recursion_level >= 24))
  85                 return -EMSGSIZE;
  86
  87         if (chunk > 0) {
  88                 if (chunk > len)
  89                         chunk = len;
  90                 elt++;
  91                 len -= chunk;
  92                 if (len == 0)
  93                         return elt;
  94                 offset += chunk;
  95         }
  96
  97         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
  98                 int end;
  99
 100                 WARN_ON(start > offset + len);
 101
 102                 end = start + skb_frag_size(&skb_shinfo(skb)->frags[i]);
 103                 chunk = end - offset;
 104                 if (chunk > 0) {
 105                         if (chunk > len)
 106                                 chunk = len;
 107                         elt++;
 108                         len -= chunk;
 109                         if (len == 0)
 110                                 return elt;
 111                         offset += chunk;
 112                 }
 113                 start = end;
 114         }
 115
 116         if (unlikely(skb_has_frag_list(skb))) {
 117                 skb_walk_frags(skb, frag_iter) {
 118                         int end, ret;
 119
 120                         WARN_ON(start > offset + len);
 121
 122                         end = start + frag_iter->len;
 123                         chunk = end - offset;
 124                         if (chunk > 0) {
 125                                 if (chunk > len)
 126                                         chunk = len;
 127                                 ret = __skb_nsg(frag_iter, offset - start, chunk,
 128                                                 recursion_level + 1);
 129                                 if (unlikely(ret < 0))
 130                                         return ret;
 131                                 elt += ret;
 132                                 len -= chunk;
 133                                 if (len == 0)
 134                                         return elt;
 135                                 offset += chunk;
 136                         }
 137                         start = end;
 138                 }
 139         }
 140         BUG_ON(len);
 141         return elt;
 142 }
 143
 144 /* Return the number of scatterlist elements required to completely map the
 145  * skb, or -EMSGSIZE if the recursion depth is exceeded.
 146  */
 147 static int skb_nsg(struct sk_buff *skb, int offset, int len)
 148 {
 149         return __skb_nsg(skb, offset, len, 0);
 150 }
 151
 152 static int tls_padding_length(struct tls_prot_info *prot, struct sk_buff *skb,
 153                               struct tls_decrypt_arg *darg)
 154 {
 155         struct strp_msg *rxm = strp_msg(skb);
 156         struct tls_msg *tlm = tls_msg(skb);
 157         int sub = 0;
 158
 159         /* Determine zero-padding length */
 160         if (prot->version == TLS_1_3_VERSION) {
 161                 int offset = rxm->full_len - TLS_TAG_SIZE - 1;
 162                 char content_type = darg->zc ? darg->tail : 0;
 163                 int err;
 164
 165                 while (content_type == 0) {
 166                         if (offset < prot->prepend_size)
 167                                 return -EBADMSG;
 168                         err = skb_copy_bits(skb, rxm->offset + offset,
 169                                             &content_type, 1);
 170                         if (err)
 171                                 return err;
 172                         if (content_type)
 173                                 break;
 174                         sub++;
 175                         offset--;
 176                 }
 177                 tlm->control = content_type;
 178         }
 179         return sub;
 180 }
 181
 182 static void tls_decrypt_done(struct crypto_async_request *req, int err)
 183 {
 184         struct aead_request *aead_req = (struct aead_request *)req;
 185         struct scatterlist *sgout = aead_req->dst;
 186         struct scatterlist *sgin = aead_req->src;
 187         struct tls_sw_context_rx *ctx;
 188         struct tls_context *tls_ctx;
 189         struct scatterlist *sg;
 190         unsigned int pages;
 191         struct sock *sk;
 192
 193         sk = (struct sock *)req->data;
 194         tls_ctx = tls_get_ctx(sk);
 195         ctx = tls_sw_ctx_rx(tls_ctx);
 196
 197         /* Propagate if there was an err */
 198         if (err) {
 199                 if (err == -EBADMSG)
 200                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSDECRYPTERROR);
 201                 ctx->async_wait.err = err;
 202                 tls_err_abort(sk, err);
 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 scatterlist *sgin,
 225                              struct scatterlist *sgout,
 226                              char *iv_recv,
 227                              size_t data_len,
 228                              struct aead_request *aead_req,
 229                              struct tls_decrypt_arg *darg)
 230 {
 231         struct tls_context *tls_ctx = tls_get_ctx(sk);
 232         struct tls_prot_info *prot = &tls_ctx->prot_info;
 233         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 234         int ret;
 235
 236         aead_request_set_tfm(aead_req, ctx->aead_recv);
 237         aead_request_set_ad(aead_req, prot->aad_size);
 238         aead_request_set_crypt(aead_req, sgin, sgout,
 239                                data_len + prot->tag_size,
 240                                (u8 *)iv_recv);
 241
 242         if (darg->async) {
 243                 aead_request_set_callback(aead_req,
 244                                           CRYPTO_TFM_REQ_MAY_BACKLOG,
 245                                           tls_decrypt_done, sk);
 246                 atomic_inc(&ctx->decrypt_pending);
 247         } else {
 248                 aead_request_set_callback(aead_req,
 249                                           CRYPTO_TFM_REQ_MAY_BACKLOG,
 250                                           crypto_req_done, &ctx->async_wait);
 251         }
 252
 253         ret = crypto_aead_decrypt(aead_req);
 254         if (ret == -EINPROGRESS) {
 255                 if (darg->async)
 256                         return 0;
 257
 258                 ret = crypto_wait_req(ret, &ctx->async_wait);
 259         }
 260         darg->async = false;
 261
 262         return ret;
 263 }
 264
 265 static void tls_trim_both_msgs(struct sock *sk, int target_size)
 266 {
 267         struct tls_context *tls_ctx = tls_get_ctx(sk);
 268         struct tls_prot_info *prot = &tls_ctx->prot_info;
 269         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 270         struct tls_rec *rec = ctx->open_rec;
 271
 272         sk_msg_trim(sk, &rec->msg_plaintext, target_size);
 273         if (target_size > 0)
 274                 target_size += prot->overhead_size;
 275         sk_msg_trim(sk, &rec->msg_encrypted, target_size);
 276 }
 277
 278 static int tls_alloc_encrypted_msg(struct sock *sk, int len)
 279 {
 280         struct tls_context *tls_ctx = tls_get_ctx(sk);
 281         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 282         struct tls_rec *rec = ctx->open_rec;
 283         struct sk_msg *msg_en = &rec->msg_encrypted;
 284
 285         return sk_msg_alloc(sk, msg_en, len, 0);
 286 }
 287
 288 static int tls_clone_plaintext_msg(struct sock *sk, int required)
 289 {
 290         struct tls_context *tls_ctx = tls_get_ctx(sk);
 291         struct tls_prot_info *prot = &tls_ctx->prot_info;
 292         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 293         struct tls_rec *rec = ctx->open_rec;
 294         struct sk_msg *msg_pl = &rec->msg_plaintext;
 295         struct sk_msg *msg_en = &rec->msg_encrypted;
 296         int skip, len;
 297
 298         /* We add page references worth len bytes from encrypted sg
 299          * at the end of plaintext sg. It is guaranteed that msg_en
 300          * has enough required room (ensured by caller).
 301          */
 302         len = required - msg_pl->sg.size;
 303
 304         /* Skip initial bytes in msg_en's data to be able to use
 305          * same offset of both plain and encrypted data.
 306          */
 307         skip = prot->prepend_size + msg_pl->sg.size;
 308
 309         return sk_msg_clone(sk, msg_pl, msg_en, skip, len);
 310 }
 311
 312 static struct tls_rec *tls_get_rec(struct sock *sk)
 313 {
 314         struct tls_context *tls_ctx = tls_get_ctx(sk);
 315         struct tls_prot_info *prot = &tls_ctx->prot_info;
 316         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 317         struct sk_msg *msg_pl, *msg_en;
 318         struct tls_rec *rec;
 319         int mem_size;
 320
 321         mem_size = sizeof(struct tls_rec) + crypto_aead_reqsize(ctx->aead_send);
 322
 323         rec = kzalloc(mem_size, sk->sk_allocation);
 324         if (!rec)
 325                 return NULL;
 326
 327         msg_pl = &rec->msg_plaintext;
 328         msg_en = &rec->msg_encrypted;
 329
 330         sk_msg_init(msg_pl);
 331         sk_msg_init(msg_en);
 332
 333         sg_init_table(rec->sg_aead_in, 2);
 334         sg_set_buf(&rec->sg_aead_in[0], rec->aad_space, prot->aad_size);
 335         sg_unmark_end(&rec->sg_aead_in[1]);
 336
 337         sg_init_table(rec->sg_aead_out, 2);
 338         sg_set_buf(&rec->sg_aead_out[0], rec->aad_space, prot->aad_size);
 339         sg_unmark_end(&rec->sg_aead_out[1]);
 340
 341         return rec;
 342 }
 343
 344 static void tls_free_rec(struct sock *sk, struct tls_rec *rec)
 345 {
 346         sk_msg_free(sk, &rec->msg_encrypted);
 347         sk_msg_free(sk, &rec->msg_plaintext);
 348         kfree(rec);
 349 }
 350
 351 static void tls_free_open_rec(struct sock *sk)
 352 {
 353         struct tls_context *tls_ctx = tls_get_ctx(sk);
 354         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 355         struct tls_rec *rec = ctx->open_rec;
 356
 357         if (rec) {
 358                 tls_free_rec(sk, rec);
 359                 ctx->open_rec = NULL;
 360         }
 361 }
 362
 363 int tls_tx_records(struct sock *sk, int flags)
 364 {
 365         struct tls_context *tls_ctx = tls_get_ctx(sk);
 366         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 367         struct tls_rec *rec, *tmp;
 368         struct sk_msg *msg_en;
 369         int tx_flags, rc = 0;
 370
 371         if (tls_is_partially_sent_record(tls_ctx)) {
 372                 rec = list_first_entry(&ctx->tx_list,
 373                                        struct tls_rec, list);
 374
 375                 if (flags == -1)
 376                         tx_flags = rec->tx_flags;
 377                 else
 378                         tx_flags = flags;
 379
 380                 rc = tls_push_partial_record(sk, tls_ctx, tx_flags);
 381                 if (rc)
 382                         goto tx_err;
 383
 384                 /* Full record has been transmitted.
 385                  * Remove the head of tx_list
 386                  */
 387                 list_del(&rec->list);
 388                 sk_msg_free(sk, &rec->msg_plaintext);
 389                 kfree(rec);
 390         }
 391
 392         /* Tx all ready records */
 393         list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) {
 394                 if (READ_ONCE(rec->tx_ready)) {
 395                         if (flags == -1)
 396                                 tx_flags = rec->tx_flags;
 397                         else
 398                                 tx_flags = flags;
 399
 400                         msg_en = &rec->msg_encrypted;
 401                         rc = tls_push_sg(sk, tls_ctx,
 402                                          &msg_en->sg.data[msg_en->sg.curr],
 403                                          0, tx_flags);
 404                         if (rc)
 405                                 goto tx_err;
 406
 407                         list_del(&rec->list);
 408                         sk_msg_free(sk, &rec->msg_plaintext);
 409                         kfree(rec);
 410                 } else {
 411                         break;
 412                 }
 413         }
 414
 415 tx_err:
 416         if (rc < 0 && rc != -EAGAIN)
 417                 tls_err_abort(sk, -EBADMSG);
 418
 419         return rc;
 420 }
 421
 422 static void tls_encrypt_done(struct crypto_async_request *req, int err)
 423 {
 424         struct aead_request *aead_req = (struct aead_request *)req;
 425         struct sock *sk = req->data;
 426         struct tls_context *tls_ctx = tls_get_ctx(sk);
 427         struct tls_prot_info *prot = &tls_ctx->prot_info;
 428         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 429         struct scatterlist *sge;
 430         struct sk_msg *msg_en;
 431         struct tls_rec *rec;
 432         bool ready = false;
 433         int pending;
 434
 435         rec = container_of(aead_req, struct tls_rec, aead_req);
 436         msg_en = &rec->msg_encrypted;
 437
 438         sge = sk_msg_elem(msg_en, msg_en->sg.curr);
 439         sge->offset -= prot->prepend_size;
 440         sge->length += prot->prepend_size;
 441
 442         /* Check if error is previously set on socket */
 443         if (err || sk->sk_err) {
 444                 rec = NULL;
 445
 446                 /* If err is already set on socket, return the same code */
 447                 if (sk->sk_err) {
 448                         ctx->async_wait.err = -sk->sk_err;
 449                 } else {
 450                         ctx->async_wait.err = err;
 451                         tls_err_abort(sk, err);
 452                 }
 453         }
 454
 455         if (rec) {
 456                 struct tls_rec *first_rec;
 457
 458                 /* Mark the record as ready for transmission */
 459                 smp_store_mb(rec->tx_ready, true);
 460
 461                 /* If received record is at head of tx_list, schedule tx */
 462                 first_rec = list_first_entry(&ctx->tx_list,
 463                                              struct tls_rec, list);
 464                 if (rec == first_rec)
 465                         ready = true;
 466         }
 467
 468         spin_lock_bh(&ctx->encrypt_compl_lock);
 469         pending = atomic_dec_return(&ctx->encrypt_pending);
 470
 471         if (!pending && ctx->async_notify)
 472                 complete(&ctx->async_wait.completion);
 473         spin_unlock_bh(&ctx->encrypt_compl_lock);
 474
 475         if (!ready)
 476                 return;
 477
 478         /* Schedule the transmission */
 479         if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask))
 480                 schedule_delayed_work(&ctx->tx_work.work, 1);
 481 }
 482
 483 static int tls_do_encryption(struct sock *sk,
 484                              struct tls_context *tls_ctx,
 485                              struct tls_sw_context_tx *ctx,
 486                              struct aead_request *aead_req,
 487                              size_t data_len, u32 start)
 488 {
 489         struct tls_prot_info *prot = &tls_ctx->prot_info;
 490         struct tls_rec *rec = ctx->open_rec;
 491         struct sk_msg *msg_en = &rec->msg_encrypted;
 492         struct scatterlist *sge = sk_msg_elem(msg_en, start);
 493         int rc, iv_offset = 0;
 494
 495         /* For CCM based ciphers, first byte of IV is a constant */
 496         switch (prot->cipher_type) {
 497         case TLS_CIPHER_AES_CCM_128:
 498                 rec->iv_data[0] = TLS_AES_CCM_IV_B0_BYTE;
 499                 iv_offset = 1;
 500                 break;
 501         case TLS_CIPHER_SM4_CCM:
 502                 rec->iv_data[0] = TLS_SM4_CCM_IV_B0_BYTE;
 503                 iv_offset = 1;
 504                 break;
 505         }
 506
 507         memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv,
 508                prot->iv_size + prot->salt_size);
 509
 510         tls_xor_iv_with_seq(prot, rec->iv_data + iv_offset,
 511                             tls_ctx->tx.rec_seq);
 512
 513         sge->offset += prot->prepend_size;
 514         sge->length -= prot->prepend_size;
 515
 516         msg_en->sg.curr = start;
 517
 518         aead_request_set_tfm(aead_req, ctx->aead_send);
 519         aead_request_set_ad(aead_req, prot->aad_size);
 520         aead_request_set_crypt(aead_req, rec->sg_aead_in,
 521                                rec->sg_aead_out,
 522                                data_len, rec->iv_data);
 523
 524         aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
 525                                   tls_encrypt_done, sk);
 526
 527         /* Add the record in tx_list */
 528         list_add_tail((struct list_head *)&rec->list, &ctx->tx_list);
 529         atomic_inc(&ctx->encrypt_pending);
 530
 531         rc = crypto_aead_encrypt(aead_req);
 532         if (!rc || rc != -EINPROGRESS) {
 533                 atomic_dec(&ctx->encrypt_pending);
 534                 sge->offset -= prot->prepend_size;
 535                 sge->length += prot->prepend_size;
 536         }
 537
 538         if (!rc) {
 539                 WRITE_ONCE(rec->tx_ready, true);
 540         } else if (rc != -EINPROGRESS) {
 541                 list_del(&rec->list);
 542                 return rc;
 543         }
 544
 545         /* Unhook the record from context if encryption is not failure */
 546         ctx->open_rec = NULL;
 547         tls_advance_record_sn(sk, prot, &tls_ctx->tx);
 548         return rc;
 549 }
 550
 551 static int tls_split_open_record(struct sock *sk, struct tls_rec *from,
 552                                  struct tls_rec **to, struct sk_msg *msg_opl,
 553                                  struct sk_msg *msg_oen, u32 split_point,
 554                                  u32 tx_overhead_size, u32 *orig_end)
 555 {
 556         u32 i, j, bytes = 0, apply = msg_opl->apply_bytes;
 557         struct scatterlist *sge, *osge, *nsge;
 558         u32 orig_size = msg_opl->sg.size;
 559         struct scatterlist tmp = { };
 560         struct sk_msg *msg_npl;
 561         struct tls_rec *new;
 562         int ret;
 563
 564         new = tls_get_rec(sk);
 565         if (!new)
 566                 return -ENOMEM;
 567         ret = sk_msg_alloc(sk, &new->msg_encrypted, msg_opl->sg.size +
 568                            tx_overhead_size, 0);
 569         if (ret < 0) {
 570                 tls_free_rec(sk, new);
 571                 return ret;
 572         }
 573
 574         *orig_end = msg_opl->sg.end;
 575         i = msg_opl->sg.start;
 576         sge = sk_msg_elem(msg_opl, i);
 577         while (apply && sge->length) {
 578                 if (sge->length > apply) {
 579                         u32 len = sge->length - apply;
 580
 581                         get_page(sg_page(sge));
 582                         sg_set_page(&tmp, sg_page(sge), len,
 583                                     sge->offset + apply);
 584                         sge->length = apply;
 585                         bytes += apply;
 586                         apply = 0;
 587                 } else {
 588                         apply -= sge->length;
 589                         bytes += sge->length;
 590                 }
 591
 592                 sk_msg_iter_var_next(i);
 593                 if (i == msg_opl->sg.end)
 594                         break;
 595                 sge = sk_msg_elem(msg_opl, i);
 596         }
 597
 598         msg_opl->sg.end = i;
 599         msg_opl->sg.curr = i;
 600         msg_opl->sg.copybreak = 0;
 601         msg_opl->apply_bytes = 0;
 602         msg_opl->sg.size = bytes;
 603
 604         msg_npl = &new->msg_plaintext;
 605         msg_npl->apply_bytes = apply;
 606         msg_npl->sg.size = orig_size - bytes;
 607
 608         j = msg_npl->sg.start;
 609         nsge = sk_msg_elem(msg_npl, j);
 610         if (tmp.length) {
 611                 memcpy(nsge, &tmp, sizeof(*nsge));
 612                 sk_msg_iter_var_next(j);
 613                 nsge = sk_msg_elem(msg_npl, j);
 614         }
 615
 616         osge = sk_msg_elem(msg_opl, i);
 617         while (osge->length) {
 618                 memcpy(nsge, osge, sizeof(*nsge));
 619                 sg_unmark_end(nsge);
 620                 sk_msg_iter_var_next(i);
 621                 sk_msg_iter_var_next(j);
 622                 if (i == *orig_end)
 623                         break;
 624                 osge = sk_msg_elem(msg_opl, i);
 625                 nsge = sk_msg_elem(msg_npl, j);
 626         }
 627
 628         msg_npl->sg.end = j;
 629         msg_npl->sg.curr = j;
 630         msg_npl->sg.copybreak = 0;
 631
 632         *to = new;
 633         return 0;
 634 }
 635
 636 static void tls_merge_open_record(struct sock *sk, struct tls_rec *to,
 637                                   struct tls_rec *from, u32 orig_end)
 638 {
 639         struct sk_msg *msg_npl = &from->msg_plaintext;
 640         struct sk_msg *msg_opl = &to->msg_plaintext;
 641         struct scatterlist *osge, *nsge;
 642         u32 i, j;
 643
 644         i = msg_opl->sg.end;
 645         sk_msg_iter_var_prev(i);
 646         j = msg_npl->sg.start;
 647
 648         osge = sk_msg_elem(msg_opl, i);
 649         nsge = sk_msg_elem(msg_npl, j);
 650
 651         if (sg_page(osge) == sg_page(nsge) &&
 652             osge->offset + osge->length == nsge->offset) {
 653                 osge->length += nsge->length;
 654                 put_page(sg_page(nsge));
 655         }
 656
 657         msg_opl->sg.end = orig_end;
 658         msg_opl->sg.curr = orig_end;
 659         msg_opl->sg.copybreak = 0;
 660         msg_opl->apply_bytes = msg_opl->sg.size + msg_npl->sg.size;
 661         msg_opl->sg.size += msg_npl->sg.size;
 662
 663         sk_msg_free(sk, &to->msg_encrypted);
 664         sk_msg_xfer_full(&to->msg_encrypted, &from->msg_encrypted);
 665
 666         kfree(from);
 667 }
 668
 669 static int tls_push_record(struct sock *sk, int flags,
 670                            unsigned char record_type)
 671 {
 672         struct tls_context *tls_ctx = tls_get_ctx(sk);
 673         struct tls_prot_info *prot = &tls_ctx->prot_info;
 674         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 675         struct tls_rec *rec = ctx->open_rec, *tmp = NULL;
 676         u32 i, split_point, orig_end;
 677         struct sk_msg *msg_pl, *msg_en;
 678         struct aead_request *req;
 679         bool split;
 680         int rc;
 681
 682         if (!rec)
 683                 return 0;
 684
 685         msg_pl = &rec->msg_plaintext;
 686         msg_en = &rec->msg_encrypted;
 687
 688         split_point = msg_pl->apply_bytes;
 689         split = split_point && split_point < msg_pl->sg.size;
 690         if (unlikely((!split &&
 691                       msg_pl->sg.size +
 692                       prot->overhead_size > msg_en->sg.size) ||
 693                      (split &&
 694                       split_point +
 695                       prot->overhead_size > msg_en->sg.size))) {
 696                 split = true;
 697                 split_point = msg_en->sg.size;
 698         }
 699         if (split) {
 700                 rc = tls_split_open_record(sk, rec, &tmp, msg_pl, msg_en,
 701                                            split_point, prot->overhead_size,
 702                                            &orig_end);
 703                 if (rc < 0)
 704                         return rc;
 705                 /* This can happen if above tls_split_open_record allocates
 706                  * a single large encryption buffer instead of two smaller
 707                  * ones. In this case adjust pointers and continue without
 708                  * split.
 709                  */
 710                 if (!msg_pl->sg.size) {
 711                         tls_merge_open_record(sk, rec, tmp, orig_end);
 712                         msg_pl = &rec->msg_plaintext;
 713                         msg_en = &rec->msg_encrypted;
 714                         split = false;
 715                 }
 716                 sk_msg_trim(sk, msg_en, msg_pl->sg.size +
 717                             prot->overhead_size);
 718         }
 719
 720         rec->tx_flags = flags;
 721         req = &rec->aead_req;
 722
 723         i = msg_pl->sg.end;
 724         sk_msg_iter_var_prev(i);
 725
 726         rec->content_type = record_type;
 727         if (prot->version == TLS_1_3_VERSION) {
 728                 /* Add content type to end of message.  No padding added */
 729                 sg_set_buf(&rec->sg_content_type, &rec->content_type, 1);
 730                 sg_mark_end(&rec->sg_content_type);
 731                 sg_chain(msg_pl->sg.data, msg_pl->sg.end + 1,
 732                          &rec->sg_content_type);
 733         } else {
 734                 sg_mark_end(sk_msg_elem(msg_pl, i));
 735         }
 736
 737         if (msg_pl->sg.end < msg_pl->sg.start) {
 738                 sg_chain(&msg_pl->sg.data[msg_pl->sg.start],
 739                          MAX_SKB_FRAGS - msg_pl->sg.start + 1,
 740                          msg_pl->sg.data);
 741         }
 742
 743         i = msg_pl->sg.start;
 744         sg_chain(rec->sg_aead_in, 2, &msg_pl->sg.data[i]);
 745
 746         i = msg_en->sg.end;
 747         sk_msg_iter_var_prev(i);
 748         sg_mark_end(sk_msg_elem(msg_en, i));
 749
 750         i = msg_en->sg.start;
 751         sg_chain(rec->sg_aead_out, 2, &msg_en->sg.data[i]);
 752
 753         tls_make_aad(rec->aad_space, msg_pl->sg.size + prot->tail_size,
 754                      tls_ctx->tx.rec_seq, record_type, prot);
 755
 756         tls_fill_prepend(tls_ctx,
 757                          page_address(sg_page(&msg_en->sg.data[i])) +
 758                          msg_en->sg.data[i].offset,
 759                          msg_pl->sg.size + prot->tail_size,
 760                          record_type);
 761
 762         tls_ctx->pending_open_record_frags = false;
 763
 764         rc = tls_do_encryption(sk, tls_ctx, ctx, req,
 765                                msg_pl->sg.size + prot->tail_size, i);
 766         if (rc < 0) {
 767                 if (rc != -EINPROGRESS) {
 768                         tls_err_abort(sk, -EBADMSG);
 769                         if (split) {
 770                                 tls_ctx->pending_open_record_frags = true;
 771                                 tls_merge_open_record(sk, rec, tmp, orig_end);
 772                         }
 773                 }
 774                 ctx->async_capable = 1;
 775                 return rc;
 776         } else if (split) {
 777                 msg_pl = &tmp->msg_plaintext;
 778                 msg_en = &tmp->msg_encrypted;
 779                 sk_msg_trim(sk, msg_en, msg_pl->sg.size + prot->overhead_size);
 780                 tls_ctx->pending_open_record_frags = true;
 781                 ctx->open_rec = tmp;
 782         }
 783
 784         return tls_tx_records(sk, flags);
 785 }
 786
 787 static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk,
 788                                bool full_record, u8 record_type,
 789                                ssize_t *copied, int flags)
 790 {
 791         struct tls_context *tls_ctx = tls_get_ctx(sk);
 792         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 793         struct sk_msg msg_redir = { };
 794         struct sk_psock *psock;
 795         struct sock *sk_redir;
 796         struct tls_rec *rec;
 797         bool enospc, policy, redir_ingress;
 798         int err = 0, send;
 799         u32 delta = 0;
 800
 801         policy = !(flags & MSG_SENDPAGE_NOPOLICY);
 802         psock = sk_psock_get(sk);
 803         if (!psock || !policy) {
 804                 err = tls_push_record(sk, flags, record_type);
 805                 if (err && err != -EINPROGRESS && sk->sk_err == EBADMSG) {
 806                         *copied -= sk_msg_free(sk, msg);
 807                         tls_free_open_rec(sk);
 808                         err = -sk->sk_err;
 809                 }
 810                 if (psock)
 811                         sk_psock_put(sk, psock);
 812                 return err;
 813         }
 814 more_data:
 815         enospc = sk_msg_full(msg);
 816         if (psock->eval == __SK_NONE) {
 817                 delta = msg->sg.size;
 818                 psock->eval = sk_psock_msg_verdict(sk, psock, msg);
 819                 delta -= msg->sg.size;
 820         }
 821         if (msg->cork_bytes && msg->cork_bytes > msg->sg.size &&
 822             !enospc && !full_record) {
 823                 err = -ENOSPC;
 824                 goto out_err;
 825         }
 826         msg->cork_bytes = 0;
 827         send = msg->sg.size;
 828         if (msg->apply_bytes && msg->apply_bytes < send)
 829                 send = msg->apply_bytes;
 830
 831         switch (psock->eval) {
 832         case __SK_PASS:
 833                 err = tls_push_record(sk, flags, record_type);
 834                 if (err && err != -EINPROGRESS && sk->sk_err == EBADMSG) {
 835                         *copied -= sk_msg_free(sk, msg);
 836                         tls_free_open_rec(sk);
 837                         err = -sk->sk_err;
 838                         goto out_err;
 839                 }
 840                 break;
 841         case __SK_REDIRECT:
 842                 redir_ingress = psock->redir_ingress;
 843                 sk_redir = psock->sk_redir;
 844                 memcpy(&msg_redir, msg, sizeof(*msg));
 845                 if (msg->apply_bytes < send)
 846                         msg->apply_bytes = 0;
 847                 else
 848                         msg->apply_bytes -= send;
 849                 sk_msg_return_zero(sk, msg, send);
 850                 msg->sg.size -= send;
 851                 release_sock(sk);
 852                 err = tcp_bpf_sendmsg_redir(sk_redir, redir_ingress,
 853                                             &msg_redir, send, flags);
 854                 lock_sock(sk);
 855                 if (err < 0) {
 856                         *copied -= sk_msg_free_nocharge(sk, &msg_redir);
 857                         msg->sg.size = 0;
 858                 }
 859                 if (msg->sg.size == 0)
 860                         tls_free_open_rec(sk);
 861                 break;
 862         case __SK_DROP:
 863         default:
 864                 sk_msg_free_partial(sk, msg, send);
 865                 if (msg->apply_bytes < send)
 866                         msg->apply_bytes = 0;
 867                 else
 868                         msg->apply_bytes -= send;
 869                 if (msg->sg.size == 0)
 870                         tls_free_open_rec(sk);
 871                 *copied -= (send + delta);
 872                 err = -EACCES;
 873         }
 874
 875         if (likely(!err)) {
 876                 bool reset_eval = !ctx->open_rec;
 877
 878                 rec = ctx->open_rec;
 879                 if (rec) {
 880                         msg = &rec->msg_plaintext;
 881                         if (!msg->apply_bytes)
 882                                 reset_eval = true;
 883                 }
 884                 if (reset_eval) {
 885                         psock->eval = __SK_NONE;
 886                         if (psock->sk_redir) {
 887                                 sock_put(psock->sk_redir);
 888                                 psock->sk_redir = NULL;
 889                         }
 890                 }
 891                 if (rec)
 892                         goto more_data;
 893         }
 894  out_err:
 895         sk_psock_put(sk, psock);
 896         return err;
 897 }
 898
 899 static int tls_sw_push_pending_record(struct sock *sk, int flags)
 900 {
 901         struct tls_context *tls_ctx = tls_get_ctx(sk);
 902         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 903         struct tls_rec *rec = ctx->open_rec;
 904         struct sk_msg *msg_pl;
 905         size_t copied;
 906
 907         if (!rec)
 908                 return 0;
 909
 910         msg_pl = &rec->msg_plaintext;
 911         copied = msg_pl->sg.size;
 912         if (!copied)
 913                 return 0;
 914
 915         return bpf_exec_tx_verdict(msg_pl, sk, true, TLS_RECORD_TYPE_DATA,
 916                                    &copied, flags);
 917 }
 918
 919 int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 920 {
 921         long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
 922         struct tls_context *tls_ctx = tls_get_ctx(sk);
 923         struct tls_prot_info *prot = &tls_ctx->prot_info;
 924         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 925         bool async_capable = ctx->async_capable;
 926         unsigned char record_type = TLS_RECORD_TYPE_DATA;
 927         bool is_kvec = iov_iter_is_kvec(&msg->msg_iter);
 928         bool eor = !(msg->msg_flags & MSG_MORE);
 929         size_t try_to_copy;
 930         ssize_t copied = 0;
 931         struct sk_msg *msg_pl, *msg_en;
 932         struct tls_rec *rec;
 933         int required_size;
 934         int num_async = 0;
 935         bool full_record;
 936         int record_room;
 937         int num_zc = 0;
 938         int orig_size;
 939         int ret = 0;
 940         int pending;
 941
 942         if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
 943                                MSG_CMSG_COMPAT))
 944                 return -EOPNOTSUPP;
 945
 946         ret = mutex_lock_interruptible(&tls_ctx->tx_lock);
 947         if (ret)
 948                 return ret;
 949         lock_sock(sk);
 950
 951         if (unlikely(msg->msg_controllen)) {
 952                 ret = tls_process_cmsg(sk, msg, &record_type);
 953                 if (ret) {
 954                         if (ret == -EINPROGRESS)
 955                                 num_async++;
 956                         else if (ret != -EAGAIN)
 957                                 goto send_end;
 958                 }
 959         }
 960
 961         while (msg_data_left(msg)) {
 962                 if (sk->sk_err) {
 963                         ret = -sk->sk_err;
 964                         goto send_end;
 965                 }
 966
 967                 if (ctx->open_rec)
 968                         rec = ctx->open_rec;
 969                 else
 970                         rec = ctx->open_rec = tls_get_rec(sk);
 971                 if (!rec) {
 972                         ret = -ENOMEM;
 973                         goto send_end;
 974                 }
 975
 976                 msg_pl = &rec->msg_plaintext;
 977                 msg_en = &rec->msg_encrypted;
 978
 979                 orig_size = msg_pl->sg.size;
 980                 full_record = false;
 981                 try_to_copy = msg_data_left(msg);
 982                 record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size;
 983                 if (try_to_copy >= record_room) {
 984                         try_to_copy = record_room;
 985                         full_record = true;
 986                 }
 987
 988                 required_size = msg_pl->sg.size + try_to_copy +
 989                                 prot->overhead_size;
 990
 991                 if (!sk_stream_memory_free(sk))
 992                         goto wait_for_sndbuf;
 993
 994 alloc_encrypted:
 995                 ret = tls_alloc_encrypted_msg(sk, required_size);
 996                 if (ret) {
 997                         if (ret != -ENOSPC)
 998                                 goto wait_for_memory;
 999
1000                         /* Adjust try_to_copy according to the amount that was
1001                          * actually allocated. The difference is due
1002                          * to max sg elements limit
1003                          */
1004                         try_to_copy -= required_size - msg_en->sg.size;
1005                         full_record = true;
1006                 }
1007
1008                 if (!is_kvec && (full_record || eor) && !async_capable) {
1009                         u32 first = msg_pl->sg.end;
1010
1011                         ret = sk_msg_zerocopy_from_iter(sk, &msg->msg_iter,
1012                                                         msg_pl, try_to_copy);
1013                         if (ret)
1014                                 goto fallback_to_reg_send;
1015
1016                         num_zc++;
1017                         copied += try_to_copy;
1018
1019                         sk_msg_sg_copy_set(msg_pl, first);
1020                         ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
1021                                                   record_type, &copied,
1022                                                   msg->msg_flags);
1023                         if (ret) {
1024                                 if (ret == -EINPROGRESS)
1025                                         num_async++;
1026                                 else if (ret == -ENOMEM)
1027                                         goto wait_for_memory;
1028                                 else if (ctx->open_rec && ret == -ENOSPC)
1029                                         goto rollback_iter;
1030                                 else if (ret != -EAGAIN)
1031                                         goto send_end;
1032                         }
1033                         continue;
1034 rollback_iter:
1035                         copied -= try_to_copy;
1036                         sk_msg_sg_copy_clear(msg_pl, first);
1037                         iov_iter_revert(&msg->msg_iter,
1038                                         msg_pl->sg.size - orig_size);
1039 fallback_to_reg_send:
1040                         sk_msg_trim(sk, msg_pl, orig_size);
1041                 }
1042
1043                 required_size = msg_pl->sg.size + try_to_copy;
1044
1045                 ret = tls_clone_plaintext_msg(sk, required_size);
1046                 if (ret) {
1047                         if (ret != -ENOSPC)
1048                                 goto send_end;
1049
1050                         /* Adjust try_to_copy according to the amount that was
1051                          * actually allocated. The difference is due
1052                          * to max sg elements limit
1053                          */
1054                         try_to_copy -= required_size - msg_pl->sg.size;
1055                         full_record = true;
1056                         sk_msg_trim(sk, msg_en,
1057                                     msg_pl->sg.size + prot->overhead_size);
1058                 }
1059
1060                 if (try_to_copy) {
1061                         ret = sk_msg_memcopy_from_iter(sk, &msg->msg_iter,
1062                                                        msg_pl, try_to_copy);
1063                         if (ret < 0)
1064                                 goto trim_sgl;
1065                 }
1066
1067                 /* Open records defined only if successfully copied, otherwise
1068                  * we would trim the sg but not reset the open record frags.
1069                  */
1070                 tls_ctx->pending_open_record_frags = true;
1071                 copied += try_to_copy;
1072                 if (full_record || eor) {
1073                         ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
1074                                                   record_type, &copied,
1075                                                   msg->msg_flags);
1076                         if (ret) {
1077                                 if (ret == -EINPROGRESS)
1078                                         num_async++;
1079                                 else if (ret == -ENOMEM)
1080                                         goto wait_for_memory;
1081                                 else if (ret != -EAGAIN) {
1082                                         if (ret == -ENOSPC)
1083                                                 ret = 0;
1084                                         goto send_end;
1085                                 }
1086                         }
1087                 }
1088
1089                 continue;
1090
1091 wait_for_sndbuf:
1092                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1093 wait_for_memory:
1094                 ret = sk_stream_wait_memory(sk, &timeo);
1095                 if (ret) {
1096 trim_sgl:
1097                         if (ctx->open_rec)
1098                                 tls_trim_both_msgs(sk, orig_size);
1099                         goto send_end;
1100                 }
1101
1102                 if (ctx->open_rec && msg_en->sg.size < required_size)
1103                         goto alloc_encrypted;
1104         }
1105
1106         if (!num_async) {
1107                 goto send_end;
1108         } else if (num_zc) {
1109                 /* Wait for pending encryptions to get completed */
1110                 spin_lock_bh(&ctx->encrypt_compl_lock);
1111                 ctx->async_notify = true;
1112
1113                 pending = atomic_read(&ctx->encrypt_pending);
1114                 spin_unlock_bh(&ctx->encrypt_compl_lock);
1115                 if (pending)
1116                         crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
1117                 else
1118                         reinit_completion(&ctx->async_wait.completion);
1119
1120                 /* There can be no concurrent accesses, since we have no
1121                  * pending encrypt operations
1122                  */
1123                 WRITE_ONCE(ctx->async_notify, false);
1124
1125                 if (ctx->async_wait.err) {
1126                         ret = ctx->async_wait.err;
1127                         copied = 0;
1128                 }
1129         }
1130
1131         /* Transmit if any encryptions have completed */
1132         if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) {
1133                 cancel_delayed_work(&ctx->tx_work.work);
1134                 tls_tx_records(sk, msg->msg_flags);
1135         }
1136
1137 send_end:
1138         ret = sk_stream_error(sk, msg->msg_flags, ret);
1139
1140         release_sock(sk);
1141         mutex_unlock(&tls_ctx->tx_lock);
1142         return copied > 0 ? copied : ret;
1143 }
1144
1145 static int tls_sw_do_sendpage(struct sock *sk, struct page *page,
1146                               int offset, size_t size, int flags)
1147 {
1148         long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1149         struct tls_context *tls_ctx = tls_get_ctx(sk);
1150         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
1151         struct tls_prot_info *prot = &tls_ctx->prot_info;
1152         unsigned char record_type = TLS_RECORD_TYPE_DATA;
1153         struct sk_msg *msg_pl;
1154         struct tls_rec *rec;
1155         int num_async = 0;
1156         ssize_t copied = 0;
1157         bool full_record;
1158         int record_room;
1159         int ret = 0;
1160         bool eor;
1161
1162         eor = !(flags & MSG_SENDPAGE_NOTLAST);
1163         sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1164
1165         /* Call the sk_stream functions to manage the sndbuf mem. */
1166         while (size > 0) {
1167                 size_t copy, required_size;
1168
1169                 if (sk->sk_err) {
1170                         ret = -sk->sk_err;
1171                         goto sendpage_end;
1172                 }
1173
1174                 if (ctx->open_rec)
1175                         rec = ctx->open_rec;
1176                 else
1177                         rec = ctx->open_rec = tls_get_rec(sk);
1178                 if (!rec) {
1179                         ret = -ENOMEM;
1180                         goto sendpage_end;
1181                 }
1182
1183                 msg_pl = &rec->msg_plaintext;
1184
1185                 full_record = false;
1186                 record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size;
1187                 copy = size;
1188                 if (copy >= record_room) {
1189                         copy = record_room;
1190                         full_record = true;
1191                 }
1192
1193                 required_size = msg_pl->sg.size + copy + prot->overhead_size;
1194
1195                 if (!sk_stream_memory_free(sk))
1196                         goto wait_for_sndbuf;
1197 alloc_payload:
1198                 ret = tls_alloc_encrypted_msg(sk, required_size);
1199                 if (ret) {
1200                         if (ret != -ENOSPC)
1201                                 goto wait_for_memory;
1202
1203                         /* Adjust copy according to the amount that was
1204                          * actually allocated. The difference is due
1205                          * to max sg elements limit
1206                          */
1207                         copy -= required_size - msg_pl->sg.size;
1208                         full_record = true;
1209                 }
1210
1211                 sk_msg_page_add(msg_pl, page, copy, offset);
1212                 sk_mem_charge(sk, copy);
1213
1214                 offset += copy;
1215                 size -= copy;
1216                 copied += copy;
1217
1218                 tls_ctx->pending_open_record_frags = true;
1219                 if (full_record || eor || sk_msg_full(msg_pl)) {
1220                         ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
1221                                                   record_type, &copied, flags);
1222                         if (ret) {
1223                                 if (ret == -EINPROGRESS)
1224                                         num_async++;
1225                                 else if (ret == -ENOMEM)
1226                                         goto wait_for_memory;
1227                                 else if (ret != -EAGAIN) {
1228                                         if (ret == -ENOSPC)
1229                                                 ret = 0;
1230                                         goto sendpage_end;
1231                                 }
1232                         }
1233                 }
1234                 continue;
1235 wait_for_sndbuf:
1236                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1237 wait_for_memory:
1238                 ret = sk_stream_wait_memory(sk, &timeo);
1239                 if (ret) {
1240                         if (ctx->open_rec)
1241                                 tls_trim_both_msgs(sk, msg_pl->sg.size);
1242                         goto sendpage_end;
1243                 }
1244
1245                 if (ctx->open_rec)
1246                         goto alloc_payload;
1247         }
1248
1249         if (num_async) {
1250                 /* Transmit if any encryptions have completed */
1251                 if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) {
1252                         cancel_delayed_work(&ctx->tx_work.work);
1253                         tls_tx_records(sk, flags);
1254                 }
1255         }
1256 sendpage_end:
1257         ret = sk_stream_error(sk, flags, ret);
1258         return copied > 0 ? copied : ret;
1259 }
1260
1261 int tls_sw_sendpage_locked(struct sock *sk, struct page *page,
1262                            int offset, size_t size, int flags)
1263 {
1264         if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
1265                       MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY |
1266                       MSG_NO_SHARED_FRAGS))
1267                 return -EOPNOTSUPP;
1268
1269         return tls_sw_do_sendpage(sk, page, offset, size, flags);
1270 }
1271
1272 int tls_sw_sendpage(struct sock *sk, struct page *page,
1273                     int offset, size_t size, int flags)
1274 {
1275         struct tls_context *tls_ctx = tls_get_ctx(sk);
1276         int ret;
1277
1278         if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
1279                       MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY))
1280                 return -EOPNOTSUPP;
1281
1282         ret = mutex_lock_interruptible(&tls_ctx->tx_lock);
1283         if (ret)
1284                 return ret;
1285         lock_sock(sk);
1286         ret = tls_sw_do_sendpage(sk, page, offset, size, flags);
1287         release_sock(sk);
1288         mutex_unlock(&tls_ctx->tx_lock);
1289         return ret;
1290 }
1291
1292 static int
1293 tls_rx_rec_wait(struct sock *sk, struct sk_psock *psock, bool nonblock,
1294                 bool released)
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         DEFINE_WAIT_FUNC(wait, woken_wake_function);
1299         long timeo;
1300
1301         timeo = sock_rcvtimeo(sk, nonblock);
1302
1303         while (!tls_strp_msg_ready(ctx)) {
1304                 if (!sk_psock_queue_empty(psock))
1305                         return 0;
1306
1307                 if (sk->sk_err)
1308                         return sock_error(sk);
1309
1310                 if (!skb_queue_empty(&sk->sk_receive_queue)) {
1311                         tls_strp_check_rcv(&ctx->strp);
1312                         if (tls_strp_msg_ready(ctx))
1313                                 break;
1314                 }
1315
1316                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1317                         return 0;
1318
1319                 if (sock_flag(sk, SOCK_DONE))
1320                         return 0;
1321
1322                 if (!timeo)
1323                         return -EAGAIN;
1324
1325                 released = true;
1326                 add_wait_queue(sk_sleep(sk), &wait);
1327                 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1328                 sk_wait_event(sk, &timeo,
1329                               tls_strp_msg_ready(ctx) ||
1330                               !sk_psock_queue_empty(psock),
1331                               &wait);
1332                 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1333                 remove_wait_queue(sk_sleep(sk), &wait);
1334
1335                 /* Handle signals */
1336                 if (signal_pending(current))
1337                         return sock_intr_errno(timeo);
1338         }
1339
1340         tls_strp_msg_load(&ctx->strp, released);
1341
1342         return 1;
1343 }
1344
1345 static int tls_setup_from_iter(struct iov_iter *from,
1346                                int length, int *pages_used,
1347                                struct scatterlist *to,
1348                                int to_max_pages)
1349 {
1350         int rc = 0, i = 0, num_elem = *pages_used, maxpages;
1351         struct page *pages[MAX_SKB_FRAGS];
1352         unsigned int size = 0;
1353         ssize_t copied, use;
1354         size_t offset;
1355
1356         while (length > 0) {
1357                 i = 0;
1358                 maxpages = to_max_pages - num_elem;
1359                 if (maxpages == 0) {
1360                         rc = -EFAULT;
1361                         goto out;
1362                 }
1363                 copied = iov_iter_get_pages2(from, pages,
1364                                             length,
1365                                             maxpages, &offset);
1366                 if (copied <= 0) {
1367                         rc = -EFAULT;
1368                         goto out;
1369                 }
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 static struct sk_buff *
1400 tls_alloc_clrtxt_skb(struct sock *sk, struct sk_buff *skb,
1401                      unsigned int full_len)
1402 {
1403         struct strp_msg *clr_rxm;
1404         struct sk_buff *clr_skb;
1405         int err;
1406
1407         clr_skb = alloc_skb_with_frags(0, full_len, TLS_PAGE_ORDER,
1408                                        &err, sk->sk_allocation);
1409         if (!clr_skb)
1410                 return NULL;
1411
1412         skb_copy_header(clr_skb, skb);
1413         clr_skb->len = full_len;
1414         clr_skb->data_len = full_len;
1415
1416         clr_rxm = strp_msg(clr_skb);
1417         clr_rxm->offset = 0;
1418
1419         return clr_skb;
1420 }
1421
1422 /* Decrypt handlers
1423  *
1424  * tls_decrypt_sw() and tls_decrypt_device() are decrypt handlers.
1425  * They must transform the darg in/out argument are as follows:
1426  *       |          Input            |         Output
1427  * -------------------------------------------------------------------
1428  *    zc | Zero-copy decrypt allowed | Zero-copy performed
1429  * async | Async decrypt allowed     | Async crypto used / in progress
1430  *   skb |            *              | Output skb
1431  *
1432  * If ZC decryption was performed darg.skb will point to the input skb.
1433  */
1434
1435 /* This function decrypts the input skb into either out_iov or in out_sg
1436  * or in skb buffers itself. The input parameter 'darg->zc' indicates if
1437  * zero-copy mode needs to be tried or not. With zero-copy mode, either
1438  * out_iov or out_sg must be non-NULL. In case both out_iov and out_sg are
1439  * NULL, then the decryption happens inside skb buffers itself, i.e.
1440  * zero-copy gets disabled and 'darg->zc' is updated.
1441  */
1442 static int tls_decrypt_sg(struct sock *sk, struct iov_iter *out_iov,
1443                           struct scatterlist *out_sg,
1444                           struct tls_decrypt_arg *darg)
1445 {
1446         struct tls_context *tls_ctx = tls_get_ctx(sk);
1447         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1448         struct tls_prot_info *prot = &tls_ctx->prot_info;
1449         int n_sgin, n_sgout, aead_size, err, pages = 0;
1450         struct sk_buff *skb = tls_strp_msg(ctx);
1451         const struct strp_msg *rxm = strp_msg(skb);
1452         const struct tls_msg *tlm = tls_msg(skb);
1453         struct aead_request *aead_req;
1454         struct scatterlist *sgin = NULL;
1455         struct scatterlist *sgout = NULL;
1456         const int data_len = rxm->full_len - prot->overhead_size;
1457         int tail_pages = !!prot->tail_size;
1458         struct tls_decrypt_ctx *dctx;
1459         struct sk_buff *clear_skb;
1460         int iv_offset = 0;
1461         u8 *mem;
1462
1463         n_sgin = skb_nsg(skb, rxm->offset + prot->prepend_size,
1464                          rxm->full_len - prot->prepend_size);
1465         if (n_sgin < 1)
1466                 return n_sgin ?: -EBADMSG;
1467
1468         if (darg->zc && (out_iov || out_sg)) {
1469                 clear_skb = NULL;
1470
1471                 if (out_iov)
1472                         n_sgout = 1 + tail_pages +
1473                                 iov_iter_npages_cap(out_iov, INT_MAX, data_len);
1474                 else
1475                         n_sgout = sg_nents(out_sg);
1476         } else {
1477                 darg->zc = false;
1478
1479                 clear_skb = tls_alloc_clrtxt_skb(sk, skb, rxm->full_len);
1480                 if (!clear_skb)
1481                         return -ENOMEM;
1482
1483                 n_sgout = 1 + skb_shinfo(clear_skb)->nr_frags;
1484         }
1485
1486         /* Increment to accommodate AAD */
1487         n_sgin = n_sgin + 1;
1488
1489         /* Allocate a single block of memory which contains
1490          *   aead_req || tls_decrypt_ctx.
1491          * Both structs are variable length.
1492          */
1493         aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv);
1494         mem = kmalloc(aead_size + struct_size(dctx, sg, n_sgin + n_sgout),
1495                       sk->sk_allocation);
1496         if (!mem) {
1497                 err = -ENOMEM;
1498                 goto exit_free_skb;
1499         }
1500
1501         /* Segment the allocated memory */
1502         aead_req = (struct aead_request *)mem;
1503         dctx = (struct tls_decrypt_ctx *)(mem + aead_size);
1504         sgin = &dctx->sg[0];
1505         sgout = &dctx->sg[n_sgin];
1506
1507         /* For CCM based ciphers, first byte of nonce+iv is a constant */
1508         switch (prot->cipher_type) {
1509         case TLS_CIPHER_AES_CCM_128:
1510                 dctx->iv[0] = TLS_AES_CCM_IV_B0_BYTE;
1511                 iv_offset = 1;
1512                 break;
1513         case TLS_CIPHER_SM4_CCM:
1514                 dctx->iv[0] = TLS_SM4_CCM_IV_B0_BYTE;
1515                 iv_offset = 1;
1516                 break;
1517         }
1518
1519         /* Prepare IV */
1520         if (prot->version == TLS_1_3_VERSION ||
1521             prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) {
1522                 memcpy(&dctx->iv[iv_offset], tls_ctx->rx.iv,
1523                        prot->iv_size + prot->salt_size);
1524         } else {
1525                 err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
1526                                     &dctx->iv[iv_offset] + prot->salt_size,
1527                                     prot->iv_size);
1528                 if (err < 0)
1529                         goto exit_free;
1530                 memcpy(&dctx->iv[iv_offset], tls_ctx->rx.iv, prot->salt_size);
1531         }
1532         tls_xor_iv_with_seq(prot, &dctx->iv[iv_offset], tls_ctx->rx.rec_seq);
1533
1534         /* Prepare AAD */
1535         tls_make_aad(dctx->aad, rxm->full_len - prot->overhead_size +
1536                      prot->tail_size,
1537                      tls_ctx->rx.rec_seq, tlm->control, prot);
1538
1539         /* Prepare sgin */
1540         sg_init_table(sgin, n_sgin);
1541         sg_set_buf(&sgin[0], dctx->aad, prot->aad_size);
1542         err = skb_to_sgvec(skb, &sgin[1],
1543                            rxm->offset + prot->prepend_size,
1544                            rxm->full_len - prot->prepend_size);
1545         if (err < 0)
1546                 goto exit_free;
1547
1548         if (clear_skb) {
1549                 sg_init_table(sgout, n_sgout);
1550                 sg_set_buf(&sgout[0], dctx->aad, prot->aad_size);
1551
1552                 err = skb_to_sgvec(clear_skb, &sgout[1], prot->prepend_size,
1553                                    data_len + prot->tail_size);
1554                 if (err < 0)
1555                         goto exit_free;
1556         } else if (out_iov) {
1557                 sg_init_table(sgout, n_sgout);
1558                 sg_set_buf(&sgout[0], dctx->aad, prot->aad_size);
1559
1560                 err = tls_setup_from_iter(out_iov, data_len, &pages, &sgout[1],
1561                                           (n_sgout - 1 - tail_pages));
1562                 if (err < 0)
1563                         goto exit_free_pages;
1564
1565                 if (prot->tail_size) {
1566                         sg_unmark_end(&sgout[pages]);
1567                         sg_set_buf(&sgout[pages + 1], &dctx->tail,
1568                                    prot->tail_size);
1569                         sg_mark_end(&sgout[pages + 1]);
1570                 }
1571         } else if (out_sg) {
1572                 memcpy(sgout, out_sg, n_sgout * sizeof(*sgout));
1573         }
1574
1575         /* Prepare and submit AEAD request */
1576         err = tls_do_decryption(sk, sgin, sgout, dctx->iv,
1577                                 data_len + prot->tail_size, aead_req, darg);
1578         if (err)
1579                 goto exit_free_pages;
1580
1581         darg->skb = clear_skb ?: tls_strp_msg(ctx);
1582         clear_skb = NULL;
1583
1584         if (unlikely(darg->async)) {
1585                 err = tls_strp_msg_hold(&ctx->strp, &ctx->async_hold);
1586                 if (err)
1587                         __skb_queue_tail(&ctx->async_hold, darg->skb);
1588                 return err;
1589         }
1590
1591         if (prot->tail_size)
1592                 darg->tail = dctx->tail;
1593
1594 exit_free_pages:
1595         /* Release the pages in case iov was mapped to pages */
1596         for (; pages > 0; pages--)
1597                 put_page(sg_page(&sgout[pages]));
1598 exit_free:
1599         kfree(mem);
1600 exit_free_skb:
1601         consume_skb(clear_skb);
1602         return err;
1603 }
1604
1605 static int
1606 tls_decrypt_sw(struct sock *sk, struct tls_context *tls_ctx,
1607                struct msghdr *msg, struct tls_decrypt_arg *darg)
1608 {
1609         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1610         struct tls_prot_info *prot = &tls_ctx->prot_info;
1611         struct strp_msg *rxm;
1612         int pad, err;
1613
1614         err = tls_decrypt_sg(sk, &msg->msg_iter, NULL, darg);
1615         if (err < 0) {
1616                 if (err == -EBADMSG)
1617                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSDECRYPTERROR);
1618                 return err;
1619         }
1620         /* keep going even for ->async, the code below is TLS 1.3 */
1621
1622         /* If opportunistic TLS 1.3 ZC failed retry without ZC */
1623         if (unlikely(darg->zc && prot->version == TLS_1_3_VERSION &&
1624                      darg->tail != TLS_RECORD_TYPE_DATA)) {
1625                 darg->zc = false;
1626                 if (!darg->tail)
1627                         TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXNOPADVIOL);
1628                 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSDECRYPTRETRY);
1629                 return tls_decrypt_sw(sk, tls_ctx, msg, darg);
1630         }
1631
1632         pad = tls_padding_length(prot, darg->skb, darg);
1633         if (pad < 0) {
1634                 if (darg->skb != tls_strp_msg(ctx))
1635                         consume_skb(darg->skb);
1636                 return pad;
1637         }
1638
1639         rxm = strp_msg(darg->skb);
1640         rxm->full_len -= pad;
1641
1642         return 0;
1643 }
1644
1645 static int
1646 tls_decrypt_device(struct sock *sk, struct msghdr *msg,
1647                    struct tls_context *tls_ctx, struct tls_decrypt_arg *darg)
1648 {
1649         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1650         struct tls_prot_info *prot = &tls_ctx->prot_info;
1651         struct strp_msg *rxm;
1652         int pad, err;
1653
1654         if (tls_ctx->rx_conf != TLS_HW)
1655                 return 0;
1656
1657         err = tls_device_decrypted(sk, tls_ctx);
1658         if (err <= 0)
1659                 return err;
1660
1661         pad = tls_padding_length(prot, tls_strp_msg(ctx), darg);
1662         if (pad < 0)
1663                 return pad;
1664
1665         darg->async = false;
1666         darg->skb = tls_strp_msg(ctx);
1667         /* ->zc downgrade check, in case TLS 1.3 gets here */
1668         darg->zc &= !(prot->version == TLS_1_3_VERSION &&
1669                       tls_msg(darg->skb)->control != TLS_RECORD_TYPE_DATA);
1670
1671         rxm = strp_msg(darg->skb);
1672         rxm->full_len -= pad;
1673
1674         if (!darg->zc) {
1675                 /* Non-ZC case needs a real skb */
1676                 darg->skb = tls_strp_msg_detach(ctx);
1677                 if (!darg->skb)
1678                         return -ENOMEM;
1679         } else {
1680                 unsigned int off, len;
1681
1682                 /* In ZC case nobody cares about the output skb.
1683                  * Just copy the data here. Note the skb is not fully trimmed.
1684                  */
1685                 off = rxm->offset + prot->prepend_size;
1686                 len = rxm->full_len - prot->overhead_size;
1687
1688                 err = skb_copy_datagram_msg(darg->skb, off, msg, len);
1689                 if (err)
1690                         return err;
1691         }
1692         return 1;
1693 }
1694
1695 static int tls_rx_one_record(struct sock *sk, struct msghdr *msg,
1696                              struct tls_decrypt_arg *darg)
1697 {
1698         struct tls_context *tls_ctx = tls_get_ctx(sk);
1699         struct tls_prot_info *prot = &tls_ctx->prot_info;
1700         struct strp_msg *rxm;
1701         int err;
1702
1703         err = tls_decrypt_device(sk, msg, tls_ctx, darg);
1704         if (!err)
1705                 err = tls_decrypt_sw(sk, tls_ctx, msg, darg);
1706         if (err < 0)
1707                 return err;
1708
1709         rxm = strp_msg(darg->skb);
1710         rxm->offset += prot->prepend_size;
1711         rxm->full_len -= prot->overhead_size;
1712         tls_advance_record_sn(sk, prot, &tls_ctx->rx);
1713
1714         return 0;
1715 }
1716
1717 int decrypt_skb(struct sock *sk, struct scatterlist *sgout)
1718 {
1719         struct tls_decrypt_arg darg = { .zc = true, };
1720
1721         return tls_decrypt_sg(sk, NULL, sgout, &darg);
1722 }
1723
1724 static int tls_record_content_type(struct msghdr *msg, struct tls_msg *tlm,
1725                                    u8 *control)
1726 {
1727         int err;
1728
1729         if (!*control) {
1730                 *control = tlm->control;
1731                 if (!*control)
1732                         return -EBADMSG;
1733
1734                 err = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE,
1735                                sizeof(*control), control);
1736                 if (*control != TLS_RECORD_TYPE_DATA) {
1737                         if (err || msg->msg_flags & MSG_CTRUNC)
1738                                 return -EIO;
1739                 }
1740         } else if (*control != tlm->control) {
1741                 return 0;
1742         }
1743
1744         return 1;
1745 }
1746
1747 static void tls_rx_rec_done(struct tls_sw_context_rx *ctx)
1748 {
1749         tls_strp_msg_done(&ctx->strp);
1750 }
1751
1752 /* This function traverses the rx_list in tls receive context to copies the
1753  * decrypted records into the buffer provided by caller zero copy is not
1754  * true. Further, the records are removed from the rx_list if it is not a peek
1755  * case and the record has been consumed completely.
1756  */
1757 static int process_rx_list(struct tls_sw_context_rx *ctx,
1758                            struct msghdr *msg,
1759                            u8 *control,
1760                            size_t skip,
1761                            size_t len,
1762                            bool is_peek)
1763 {
1764         struct sk_buff *skb = skb_peek(&ctx->rx_list);
1765         struct tls_msg *tlm;
1766         ssize_t copied = 0;
1767         int err;
1768
1769         while (skip && skb) {
1770                 struct strp_msg *rxm = strp_msg(skb);
1771                 tlm = tls_msg(skb);
1772
1773                 err = tls_record_content_type(msg, tlm, control);
1774                 if (err <= 0)
1775                         goto out;
1776
1777                 if (skip < rxm->full_len)
1778                         break;
1779
1780                 skip = skip - rxm->full_len;
1781                 skb = skb_peek_next(skb, &ctx->rx_list);
1782         }
1783
1784         while (len && skb) {
1785                 struct sk_buff *next_skb;
1786                 struct strp_msg *rxm = strp_msg(skb);
1787                 int chunk = min_t(unsigned int, rxm->full_len - skip, len);
1788
1789                 tlm = tls_msg(skb);
1790
1791                 err = tls_record_content_type(msg, tlm, control);
1792                 if (err <= 0)
1793                         goto out;
1794
1795                 err = skb_copy_datagram_msg(skb, rxm->offset + skip,
1796                                             msg, chunk);
1797                 if (err < 0)
1798                         goto out;
1799
1800                 len = len - chunk;
1801                 copied = copied + chunk;
1802
1803                 /* Consume the data from record if it is non-peek case*/
1804                 if (!is_peek) {
1805                         rxm->offset = rxm->offset + chunk;
1806                         rxm->full_len = rxm->full_len - chunk;
1807
1808                         /* Return if there is unconsumed data in the record */
1809                         if (rxm->full_len - skip)
1810                                 break;
1811                 }
1812
1813                 /* The remaining skip-bytes must lie in 1st record in rx_list.
1814                  * So from the 2nd record, 'skip' should be 0.
1815                  */
1816                 skip = 0;
1817
1818                 if (msg)
1819                         msg->msg_flags |= MSG_EOR;
1820
1821                 next_skb = skb_peek_next(skb, &ctx->rx_list);
1822
1823                 if (!is_peek) {
1824                         __skb_unlink(skb, &ctx->rx_list);
1825                         consume_skb(skb);
1826                 }
1827
1828                 skb = next_skb;
1829         }
1830         err = 0;
1831
1832 out:
1833         return copied ? : err;
1834 }
1835
1836 static bool
1837 tls_read_flush_backlog(struct sock *sk, struct tls_prot_info *prot,
1838                        size_t len_left, size_t decrypted, ssize_t done,
1839                        size_t *flushed_at)
1840 {
1841         size_t max_rec;
1842
1843         if (len_left <= decrypted)
1844                 return false;
1845
1846         max_rec = prot->overhead_size - prot->tail_size + TLS_MAX_PAYLOAD_SIZE;
1847         if (done - *flushed_at < SZ_128K && tcp_inq(sk) > max_rec)
1848                 return false;
1849
1850         *flushed_at = done;
1851         return sk_flush_backlog(sk);
1852 }
1853
1854 static int tls_rx_reader_lock(struct sock *sk, struct tls_sw_context_rx *ctx,
1855                               bool nonblock)
1856 {
1857         long timeo;
1858         int err;
1859
1860         lock_sock(sk);
1861
1862         timeo = sock_rcvtimeo(sk, nonblock);
1863
1864         while (unlikely(ctx->reader_present)) {
1865                 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1866
1867                 ctx->reader_contended = 1;
1868
1869                 add_wait_queue(&ctx->wq, &wait);
1870                 sk_wait_event(sk, &timeo,
1871                               !READ_ONCE(ctx->reader_present), &wait);
1872                 remove_wait_queue(&ctx->wq, &wait);
1873
1874                 if (timeo <= 0) {
1875                         err = -EAGAIN;
1876                         goto err_unlock;
1877                 }
1878                 if (signal_pending(current)) {
1879                         err = sock_intr_errno(timeo);
1880                         goto err_unlock;
1881                 }
1882         }
1883
1884         WRITE_ONCE(ctx->reader_present, 1);
1885
1886         return 0;
1887
1888 err_unlock:
1889         release_sock(sk);
1890         return err;
1891 }
1892
1893 static void tls_rx_reader_unlock(struct sock *sk, struct tls_sw_context_rx *ctx)
1894 {
1895         if (unlikely(ctx->reader_contended)) {
1896                 if (wq_has_sleeper(&ctx->wq))
1897                         wake_up(&ctx->wq);
1898                 else
1899                         ctx->reader_contended = 0;
1900
1901                 WARN_ON_ONCE(!ctx->reader_present);
1902         }
1903
1904         WRITE_ONCE(ctx->reader_present, 0);
1905         release_sock(sk);
1906 }
1907
1908 int tls_sw_recvmsg(struct sock *sk,
1909                    struct msghdr *msg,
1910                    size_t len,
1911                    int flags,
1912                    int *addr_len)
1913 {
1914         struct tls_context *tls_ctx = tls_get_ctx(sk);
1915         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1916         struct tls_prot_info *prot = &tls_ctx->prot_info;
1917         ssize_t decrypted = 0, async_copy_bytes = 0;
1918         struct sk_psock *psock;
1919         unsigned char control = 0;
1920         size_t flushed_at = 0;
1921         struct strp_msg *rxm;
1922         struct tls_msg *tlm;
1923         ssize_t copied = 0;
1924         bool async = false;
1925         int target, err;
1926         bool is_kvec = iov_iter_is_kvec(&msg->msg_iter);
1927         bool is_peek = flags & MSG_PEEK;
1928         bool released = true;
1929         bool bpf_strp_enabled;
1930         bool zc_capable;
1931
1932         if (unlikely(flags & MSG_ERRQUEUE))
1933                 return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR);
1934
1935         psock = sk_psock_get(sk);
1936         err = tls_rx_reader_lock(sk, ctx, flags & MSG_DONTWAIT);
1937         if (err < 0)
1938                 return err;
1939         bpf_strp_enabled = sk_psock_strp_enabled(psock);
1940
1941         /* If crypto failed the connection is broken */
1942         err = ctx->async_wait.err;
1943         if (err)
1944                 goto end;
1945
1946         /* Process pending decrypted records. It must be non-zero-copy */
1947         err = process_rx_list(ctx, msg, &control, 0, len, is_peek);
1948         if (err < 0)
1949                 goto end;
1950
1951         copied = err;
1952         if (len <= copied)
1953                 goto end;
1954
1955         target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
1956         len = len - copied;
1957
1958         zc_capable = !bpf_strp_enabled && !is_kvec && !is_peek &&
1959                 ctx->zc_capable;
1960         decrypted = 0;
1961         while (len && (decrypted + copied < target || tls_strp_msg_ready(ctx))) {
1962                 struct tls_decrypt_arg darg;
1963                 int to_decrypt, chunk;
1964
1965                 err = tls_rx_rec_wait(sk, psock, flags & MSG_DONTWAIT,
1966                                       released);
1967                 if (err <= 0) {
1968                         if (psock) {
1969                                 chunk = sk_msg_recvmsg(sk, psock, msg, len,
1970                                                        flags);
1971                                 if (chunk > 0) {
1972                                         decrypted += chunk;
1973                                         len -= chunk;
1974                                         continue;
1975                                 }
1976                         }
1977                         goto recv_end;
1978                 }
1979
1980                 memset(&darg.inargs, 0, sizeof(darg.inargs));
1981
1982                 rxm = strp_msg(tls_strp_msg(ctx));
1983                 tlm = tls_msg(tls_strp_msg(ctx));
1984
1985                 to_decrypt = rxm->full_len - prot->overhead_size;
1986
1987                 if (zc_capable && to_decrypt <= len &&
1988                     tlm->control == TLS_RECORD_TYPE_DATA)
1989                         darg.zc = true;
1990
1991                 /* Do not use async mode if record is non-data */
1992                 if (tlm->control == TLS_RECORD_TYPE_DATA && !bpf_strp_enabled)
1993                         darg.async = ctx->async_capable;
1994                 else
1995                         darg.async = false;
1996
1997                 err = tls_rx_one_record(sk, msg, &darg);
1998                 if (err < 0) {
1999                         tls_err_abort(sk, -EBADMSG);
2000                         goto recv_end;
2001                 }
2002
2003                 async |= darg.async;
2004
2005                 /* If the type of records being processed is not known yet,
2006                  * set it to record type just dequeued. If it is already known,
2007                  * but does not match the record type just dequeued, go to end.
2008                  * We always get record type here since for tls1.2, record type
2009                  * is known just after record is dequeued from stream parser.
2010                  * For tls1.3, we disable async.
2011                  */
2012                 err = tls_record_content_type(msg, tls_msg(darg.skb), &control);
2013                 if (err <= 0) {
2014                         DEBUG_NET_WARN_ON_ONCE(darg.zc);
2015                         tls_rx_rec_done(ctx);
2016 put_on_rx_list_err:
2017                         __skb_queue_tail(&ctx->rx_list, darg.skb);
2018                         goto recv_end;
2019                 }
2020
2021                 /* periodically flush backlog, and feed strparser */
2022                 released = tls_read_flush_backlog(sk, prot, len, to_decrypt,
2023                                                   decrypted + copied,
2024                                                   &flushed_at);
2025
2026                 /* TLS 1.3 may have updated the length by more than overhead */
2027                 rxm = strp_msg(darg.skb);
2028                 chunk = rxm->full_len;
2029                 tls_rx_rec_done(ctx);
2030
2031                 if (!darg.zc) {
2032                         bool partially_consumed = chunk > len;
2033                         struct sk_buff *skb = darg.skb;
2034
2035                         DEBUG_NET_WARN_ON_ONCE(darg.skb == ctx->strp.anchor);
2036
2037                         if (async) {
2038                                 /* TLS 1.2-only, to_decrypt must be text len */
2039                                 chunk = min_t(int, to_decrypt, len);
2040                                 async_copy_bytes += chunk;
2041 put_on_rx_list:
2042                                 decrypted += chunk;
2043                                 len -= chunk;
2044                                 __skb_queue_tail(&ctx->rx_list, skb);
2045                                 continue;
2046                         }
2047
2048                         if (bpf_strp_enabled) {
2049                                 released = true;
2050                                 err = sk_psock_tls_strp_read(psock, skb);
2051                                 if (err != __SK_PASS) {
2052                                         rxm->offset = rxm->offset + rxm->full_len;
2053                                         rxm->full_len = 0;
2054                                         if (err == __SK_DROP)
2055                                                 consume_skb(skb);
2056                                         continue;
2057                                 }
2058                         }
2059
2060                         if (partially_consumed)
2061                                 chunk = len;
2062
2063                         err = skb_copy_datagram_msg(skb, rxm->offset,
2064                                                     msg, chunk);
2065                         if (err < 0)
2066                                 goto put_on_rx_list_err;
2067
2068                         if (is_peek)
2069                                 goto put_on_rx_list;
2070
2071                         if (partially_consumed) {
2072                                 rxm->offset += chunk;
2073                                 rxm->full_len -= chunk;
2074                                 goto put_on_rx_list;
2075                         }
2076
2077                         consume_skb(skb);
2078                 }
2079
2080                 decrypted += chunk;
2081                 len -= chunk;
2082
2083                 /* Return full control message to userspace before trying
2084                  * to parse another message type
2085                  */
2086                 msg->msg_flags |= MSG_EOR;
2087                 if (control != TLS_RECORD_TYPE_DATA)
2088                         break;
2089         }
2090
2091 recv_end:
2092         if (async) {
2093                 int ret, pending;
2094
2095                 /* Wait for all previously submitted records to be decrypted */
2096                 spin_lock_bh(&ctx->decrypt_compl_lock);
2097                 reinit_completion(&ctx->async_wait.completion);
2098                 pending = atomic_read(&ctx->decrypt_pending);
2099                 spin_unlock_bh(&ctx->decrypt_compl_lock);
2100                 ret = 0;
2101                 if (pending)
2102                         ret = crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
2103                 __skb_queue_purge(&ctx->async_hold);
2104
2105                 if (ret) {
2106                         if (err >= 0 || err == -EINPROGRESS)
2107                                 err = ret;
2108                         decrypted = 0;
2109                         goto end;
2110                 }
2111
2112                 /* Drain records from the rx_list & copy if required */
2113                 if (is_peek || is_kvec)
2114                         err = process_rx_list(ctx, msg, &control, copied,
2115                                               decrypted, is_peek);
2116                 else
2117                         err = process_rx_list(ctx, msg, &control, 0,
2118                                               async_copy_bytes, is_peek);
2119                 decrypted += max(err, 0);
2120         }
2121
2122         copied += decrypted;
2123
2124 end:
2125         tls_rx_reader_unlock(sk, ctx);
2126         if (psock)
2127                 sk_psock_put(sk, psock);
2128         return copied ? : err;
2129 }
2130
2131 ssize_t tls_sw_splice_read(struct socket *sock,  loff_t *ppos,
2132                            struct pipe_inode_info *pipe,
2133                            size_t len, unsigned int flags)
2134 {
2135         struct tls_context *tls_ctx = tls_get_ctx(sock->sk);
2136         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2137         struct strp_msg *rxm = NULL;
2138         struct sock *sk = sock->sk;
2139         struct tls_msg *tlm;
2140         struct sk_buff *skb;
2141         ssize_t copied = 0;
2142         int chunk;
2143         int err;
2144
2145         err = tls_rx_reader_lock(sk, ctx, flags & SPLICE_F_NONBLOCK);
2146         if (err < 0)
2147                 return err;
2148
2149         if (!skb_queue_empty(&ctx->rx_list)) {
2150                 skb = __skb_dequeue(&ctx->rx_list);
2151         } else {
2152                 struct tls_decrypt_arg darg;
2153
2154                 err = tls_rx_rec_wait(sk, NULL, flags & SPLICE_F_NONBLOCK,
2155                                       true);
2156                 if (err <= 0)
2157                         goto splice_read_end;
2158
2159                 memset(&darg.inargs, 0, sizeof(darg.inargs));
2160
2161                 err = tls_rx_one_record(sk, NULL, &darg);
2162                 if (err < 0) {
2163                         tls_err_abort(sk, -EBADMSG);
2164                         goto splice_read_end;
2165                 }
2166
2167                 tls_rx_rec_done(ctx);
2168                 skb = darg.skb;
2169         }
2170
2171         rxm = strp_msg(skb);
2172         tlm = tls_msg(skb);
2173
2174         /* splice does not support reading control messages */
2175         if (tlm->control != TLS_RECORD_TYPE_DATA) {
2176                 err = -EINVAL;
2177                 goto splice_requeue;
2178         }
2179
2180         chunk = min_t(unsigned int, rxm->full_len, len);
2181         copied = skb_splice_bits(skb, sk, rxm->offset, pipe, chunk, flags);
2182         if (copied < 0)
2183                 goto splice_requeue;
2184
2185         if (chunk < rxm->full_len) {
2186                 rxm->offset += len;
2187                 rxm->full_len -= len;
2188                 goto splice_requeue;
2189         }
2190
2191         consume_skb(skb);
2192
2193 splice_read_end:
2194         tls_rx_reader_unlock(sk, ctx);
2195         return copied ? : err;
2196
2197 splice_requeue:
2198         __skb_queue_head(&ctx->rx_list, skb);
2199         goto splice_read_end;
2200 }
2201
2202 bool tls_sw_sock_is_readable(struct sock *sk)
2203 {
2204         struct tls_context *tls_ctx = tls_get_ctx(sk);
2205         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2206         bool ingress_empty = true;
2207         struct sk_psock *psock;
2208
2209         rcu_read_lock();
2210         psock = sk_psock(sk);
2211         if (psock)
2212                 ingress_empty = list_empty(&psock->ingress_msg);
2213         rcu_read_unlock();
2214
2215         return !ingress_empty || tls_strp_msg_ready(ctx) ||
2216                 !skb_queue_empty(&ctx->rx_list);
2217 }
2218
2219 int tls_rx_msg_size(struct tls_strparser *strp, struct sk_buff *skb)
2220 {
2221         struct tls_context *tls_ctx = tls_get_ctx(strp->sk);
2222         struct tls_prot_info *prot = &tls_ctx->prot_info;
2223         char header[TLS_HEADER_SIZE + MAX_IV_SIZE];
2224         size_t cipher_overhead;
2225         size_t data_len = 0;
2226         int ret;
2227
2228         /* Verify that we have a full TLS header, or wait for more data */
2229         if (strp->stm.offset + prot->prepend_size > skb->len)
2230                 return 0;
2231
2232         /* Sanity-check size of on-stack buffer. */
2233         if (WARN_ON(prot->prepend_size > sizeof(header))) {
2234                 ret = -EINVAL;
2235                 goto read_failure;
2236         }
2237
2238         /* Linearize header to local buffer */
2239         ret = skb_copy_bits(skb, strp->stm.offset, header, prot->prepend_size);
2240         if (ret < 0)
2241                 goto read_failure;
2242
2243         strp->mark = header[0];
2244
2245         data_len = ((header[4] & 0xFF) | (header[3] << 8));
2246
2247         cipher_overhead = prot->tag_size;
2248         if (prot->version != TLS_1_3_VERSION &&
2249             prot->cipher_type != TLS_CIPHER_CHACHA20_POLY1305)
2250                 cipher_overhead += prot->iv_size;
2251
2252         if (data_len > TLS_MAX_PAYLOAD_SIZE + cipher_overhead +
2253             prot->tail_size) {
2254                 ret = -EMSGSIZE;
2255                 goto read_failure;
2256         }
2257         if (data_len < cipher_overhead) {
2258                 ret = -EBADMSG;
2259                 goto read_failure;
2260         }
2261
2262         /* Note that both TLS1.3 and TLS1.2 use TLS_1_2 version here */
2263         if (header[1] != TLS_1_2_VERSION_MINOR ||
2264             header[2] != TLS_1_2_VERSION_MAJOR) {
2265                 ret = -EINVAL;
2266                 goto read_failure;
2267         }
2268
2269         tls_device_rx_resync_new_rec(strp->sk, data_len + TLS_HEADER_SIZE,
2270                                      TCP_SKB_CB(skb)->seq + strp->stm.offset);
2271         return data_len + TLS_HEADER_SIZE;
2272
2273 read_failure:
2274         tls_err_abort(strp->sk, ret);
2275
2276         return ret;
2277 }
2278
2279 void tls_rx_msg_ready(struct tls_strparser *strp)
2280 {
2281         struct tls_sw_context_rx *ctx;
2282
2283         ctx = container_of(strp, struct tls_sw_context_rx, strp);
2284         ctx->saved_data_ready(strp->sk);
2285 }
2286
2287 static void tls_data_ready(struct sock *sk)
2288 {
2289         struct tls_context *tls_ctx = tls_get_ctx(sk);
2290         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2291         struct sk_psock *psock;
2292         gfp_t alloc_save;
2293
2294         alloc_save = sk->sk_allocation;
2295         sk->sk_allocation = GFP_ATOMIC;
2296         tls_strp_data_ready(&ctx->strp);
2297         sk->sk_allocation = alloc_save;
2298
2299         psock = sk_psock_get(sk);
2300         if (psock) {
2301                 if (!list_empty(&psock->ingress_msg))
2302                         ctx->saved_data_ready(sk);
2303                 sk_psock_put(sk, psock);
2304         }
2305 }
2306
2307 void tls_sw_cancel_work_tx(struct tls_context *tls_ctx)
2308 {
2309         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
2310
2311         set_bit(BIT_TX_CLOSING, &ctx->tx_bitmask);
2312         set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask);
2313         cancel_delayed_work_sync(&ctx->tx_work.work);
2314 }
2315
2316 void tls_sw_release_resources_tx(struct sock *sk)
2317 {
2318         struct tls_context *tls_ctx = tls_get_ctx(sk);
2319         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
2320         struct tls_rec *rec, *tmp;
2321         int pending;
2322
2323         /* Wait for any pending async encryptions to complete */
2324         spin_lock_bh(&ctx->encrypt_compl_lock);
2325         ctx->async_notify = true;
2326         pending = atomic_read(&ctx->encrypt_pending);
2327         spin_unlock_bh(&ctx->encrypt_compl_lock);
2328
2329         if (pending)
2330                 crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
2331
2332         tls_tx_records(sk, -1);
2333
2334         /* Free up un-sent records in tx_list. First, free
2335          * the partially sent record if any at head of tx_list.
2336          */
2337         if (tls_ctx->partially_sent_record) {
2338                 tls_free_partial_record(sk, tls_ctx);
2339                 rec = list_first_entry(&ctx->tx_list,
2340                                        struct tls_rec, list);
2341                 list_del(&rec->list);
2342                 sk_msg_free(sk, &rec->msg_plaintext);
2343                 kfree(rec);
2344         }
2345
2346         list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) {
2347                 list_del(&rec->list);
2348                 sk_msg_free(sk, &rec->msg_encrypted);
2349                 sk_msg_free(sk, &rec->msg_plaintext);
2350                 kfree(rec);
2351         }
2352
2353         crypto_free_aead(ctx->aead_send);
2354         tls_free_open_rec(sk);
2355 }
2356
2357 void tls_sw_free_ctx_tx(struct tls_context *tls_ctx)
2358 {
2359         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
2360
2361         kfree(ctx);
2362 }
2363
2364 void tls_sw_release_resources_rx(struct sock *sk)
2365 {
2366         struct tls_context *tls_ctx = tls_get_ctx(sk);
2367         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2368
2369         kfree(tls_ctx->rx.rec_seq);
2370         kfree(tls_ctx->rx.iv);
2371
2372         if (ctx->aead_recv) {
2373                 __skb_queue_purge(&ctx->rx_list);
2374                 crypto_free_aead(ctx->aead_recv);
2375                 tls_strp_stop(&ctx->strp);
2376                 /* If tls_sw_strparser_arm() was not called (cleanup paths)
2377                  * we still want to tls_strp_stop(), but sk->sk_data_ready was
2378                  * never swapped.
2379                  */
2380                 if (ctx->saved_data_ready) {
2381                         write_lock_bh(&sk->sk_callback_lock);
2382                         sk->sk_data_ready = ctx->saved_data_ready;
2383                         write_unlock_bh(&sk->sk_callback_lock);
2384                 }
2385         }
2386 }
2387
2388 void tls_sw_strparser_done(struct tls_context *tls_ctx)
2389 {
2390         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2391
2392         tls_strp_done(&ctx->strp);
2393 }
2394
2395 void tls_sw_free_ctx_rx(struct tls_context *tls_ctx)
2396 {
2397         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
2398
2399         kfree(ctx);
2400 }
2401
2402 void tls_sw_free_resources_rx(struct sock *sk)
2403 {
2404         struct tls_context *tls_ctx = tls_get_ctx(sk);
2405
2406         tls_sw_release_resources_rx(sk);
2407         tls_sw_free_ctx_rx(tls_ctx);
2408 }
2409
2410 /* The work handler to transmitt the encrypted records in tx_list */
2411 static void tx_work_handler(struct work_struct *work)
2412 {
2413         struct delayed_work *delayed_work = to_delayed_work(work);
2414         struct tx_work *tx_work = container_of(delayed_work,
2415                                                struct tx_work, work);
2416         struct sock *sk = tx_work->sk;
2417         struct tls_context *tls_ctx = tls_get_ctx(sk);
2418         struct tls_sw_context_tx *ctx;
2419
2420         if (unlikely(!tls_ctx))
2421                 return;
2422
2423         ctx = tls_sw_ctx_tx(tls_ctx);
2424         if (test_bit(BIT_TX_CLOSING, &ctx->tx_bitmask))
2425                 return;
2426
2427         if (!test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask))
2428                 return;
2429
2430         if (mutex_trylock(&tls_ctx->tx_lock)) {
2431                 lock_sock(sk);
2432                 tls_tx_records(sk, -1);
2433                 release_sock(sk);
2434                 mutex_unlock(&tls_ctx->tx_lock);
2435         } else if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) {
2436                 /* Someone is holding the tx_lock, they will likely run Tx
2437                  * and cancel the work on their way out of the lock section.
2438                  * Schedule a long delay just in case.
2439                  */
2440                 schedule_delayed_work(&ctx->tx_work.work, msecs_to_jiffies(10));
2441         }
2442 }
2443
2444 static bool tls_is_tx_ready(struct tls_sw_context_tx *ctx)
2445 {
2446         struct tls_rec *rec;
2447
2448         rec = list_first_entry_or_null(&ctx->tx_list, struct tls_rec, list);
2449         if (!rec)
2450                 return false;
2451
2452         return READ_ONCE(rec->tx_ready);
2453 }
2454
2455 void tls_sw_write_space(struct sock *sk, struct tls_context *ctx)
2456 {
2457         struct tls_sw_context_tx *tx_ctx = tls_sw_ctx_tx(ctx);
2458
2459         /* Schedule the transmission if tx list is ready */
2460         if (tls_is_tx_ready(tx_ctx) &&
2461             !test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask))
2462                 schedule_delayed_work(&tx_ctx->tx_work.work, 0);
2463 }
2464
2465 void tls_sw_strparser_arm(struct sock *sk, struct tls_context *tls_ctx)
2466 {
2467         struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(tls_ctx);
2468
2469         write_lock_bh(&sk->sk_callback_lock);
2470         rx_ctx->saved_data_ready = sk->sk_data_ready;
2471         sk->sk_data_ready = tls_data_ready;
2472         write_unlock_bh(&sk->sk_callback_lock);
2473 }
2474
2475 void tls_update_rx_zc_capable(struct tls_context *tls_ctx)
2476 {
2477         struct tls_sw_context_rx *rx_ctx = tls_sw_ctx_rx(tls_ctx);
2478
2479         rx_ctx->zc_capable = tls_ctx->rx_no_pad ||
2480                 tls_ctx->prot_info.version != TLS_1_3_VERSION;
2481 }
2482
2483 int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
2484 {
2485         struct tls_context *tls_ctx = tls_get_ctx(sk);
2486         struct tls_prot_info *prot = &tls_ctx->prot_info;
2487         struct tls_crypto_info *crypto_info;
2488         struct tls_sw_context_tx *sw_ctx_tx = NULL;
2489         struct tls_sw_context_rx *sw_ctx_rx = NULL;
2490         struct cipher_context *cctx;
2491         struct crypto_aead **aead;
2492         u16 nonce_size, tag_size, iv_size, rec_seq_size, salt_size;
2493         struct crypto_tfm *tfm;
2494         char *iv, *rec_seq, *key, *salt, *cipher_name;
2495         size_t keysize;
2496         int rc = 0;
2497
2498         if (!ctx) {
2499                 rc = -EINVAL;
2500                 goto out;
2501         }
2502
2503         if (tx) {
2504                 if (!ctx->priv_ctx_tx) {
2505                         sw_ctx_tx = kzalloc(sizeof(*sw_ctx_tx), GFP_KERNEL);
2506                         if (!sw_ctx_tx) {
2507                                 rc = -ENOMEM;
2508                                 goto out;
2509                         }
2510                         ctx->priv_ctx_tx = sw_ctx_tx;
2511                 } else {
2512                         sw_ctx_tx =
2513                                 (struct tls_sw_context_tx *)ctx->priv_ctx_tx;
2514                 }
2515         } else {
2516                 if (!ctx->priv_ctx_rx) {
2517                         sw_ctx_rx = kzalloc(sizeof(*sw_ctx_rx), GFP_KERNEL);
2518                         if (!sw_ctx_rx) {
2519                                 rc = -ENOMEM;
2520                                 goto out;
2521                         }
2522                         ctx->priv_ctx_rx = sw_ctx_rx;
2523                 } else {
2524                         sw_ctx_rx =
2525                                 (struct tls_sw_context_rx *)ctx->priv_ctx_rx;
2526                 }
2527         }
2528
2529         if (tx) {
2530                 crypto_init_wait(&sw_ctx_tx->async_wait);
2531                 spin_lock_init(&sw_ctx_tx->encrypt_compl_lock);
2532                 crypto_info = &ctx->crypto_send.info;
2533                 cctx = &ctx->tx;
2534                 aead = &sw_ctx_tx->aead_send;
2535                 INIT_LIST_HEAD(&sw_ctx_tx->tx_list);
2536                 INIT_DELAYED_WORK(&sw_ctx_tx->tx_work.work, tx_work_handler);
2537                 sw_ctx_tx->tx_work.sk = sk;
2538         } else {
2539                 crypto_init_wait(&sw_ctx_rx->async_wait);
2540                 spin_lock_init(&sw_ctx_rx->decrypt_compl_lock);
2541                 init_waitqueue_head(&sw_ctx_rx->wq);
2542                 crypto_info = &ctx->crypto_recv.info;
2543                 cctx = &ctx->rx;
2544                 skb_queue_head_init(&sw_ctx_rx->rx_list);
2545                 skb_queue_head_init(&sw_ctx_rx->async_hold);
2546                 aead = &sw_ctx_rx->aead_recv;
2547         }
2548
2549         switch (crypto_info->cipher_type) {
2550         case TLS_CIPHER_AES_GCM_128: {
2551                 struct tls12_crypto_info_aes_gcm_128 *gcm_128_info;
2552
2553                 gcm_128_info = (void *)crypto_info;
2554                 nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
2555                 tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE;
2556                 iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
2557                 iv = gcm_128_info->iv;
2558                 rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE;
2559                 rec_seq = gcm_128_info->rec_seq;
2560                 keysize = TLS_CIPHER_AES_GCM_128_KEY_SIZE;
2561                 key = gcm_128_info->key;
2562                 salt = gcm_128_info->salt;
2563                 salt_size = TLS_CIPHER_AES_GCM_128_SALT_SIZE;
2564                 cipher_name = "gcm(aes)";
2565                 break;
2566         }
2567         case TLS_CIPHER_AES_GCM_256: {
2568                 struct tls12_crypto_info_aes_gcm_256 *gcm_256_info;
2569
2570                 gcm_256_info = (void *)crypto_info;
2571                 nonce_size = TLS_CIPHER_AES_GCM_256_IV_SIZE;
2572                 tag_size = TLS_CIPHER_AES_GCM_256_TAG_SIZE;
2573                 iv_size = TLS_CIPHER_AES_GCM_256_IV_SIZE;
2574                 iv = gcm_256_info->iv;
2575                 rec_seq_size = TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE;
2576                 rec_seq = gcm_256_info->rec_seq;
2577                 keysize = TLS_CIPHER_AES_GCM_256_KEY_SIZE;
2578                 key = gcm_256_info->key;
2579                 salt = gcm_256_info->salt;
2580                 salt_size = TLS_CIPHER_AES_GCM_256_SALT_SIZE;
2581                 cipher_name = "gcm(aes)";
2582                 break;
2583         }
2584         case TLS_CIPHER_AES_CCM_128: {
2585                 struct tls12_crypto_info_aes_ccm_128 *ccm_128_info;
2586
2587                 ccm_128_info = (void *)crypto_info;
2588                 nonce_size = TLS_CIPHER_AES_CCM_128_IV_SIZE;
2589                 tag_size = TLS_CIPHER_AES_CCM_128_TAG_SIZE;
2590                 iv_size = TLS_CIPHER_AES_CCM_128_IV_SIZE;
2591                 iv = ccm_128_info->iv;
2592                 rec_seq_size = TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE;
2593                 rec_seq = ccm_128_info->rec_seq;
2594                 keysize = TLS_CIPHER_AES_CCM_128_KEY_SIZE;
2595                 key = ccm_128_info->key;
2596                 salt = ccm_128_info->salt;
2597                 salt_size = TLS_CIPHER_AES_CCM_128_SALT_SIZE;
2598                 cipher_name = "ccm(aes)";
2599                 break;
2600         }
2601         case TLS_CIPHER_CHACHA20_POLY1305: {
2602                 struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305_info;
2603
2604                 chacha20_poly1305_info = (void *)crypto_info;
2605                 nonce_size = 0;
2606                 tag_size = TLS_CIPHER_CHACHA20_POLY1305_TAG_SIZE;
2607                 iv_size = TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE;
2608                 iv = chacha20_poly1305_info->iv;
2609                 rec_seq_size = TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE;
2610                 rec_seq = chacha20_poly1305_info->rec_seq;
2611                 keysize = TLS_CIPHER_CHACHA20_POLY1305_KEY_SIZE;
2612                 key = chacha20_poly1305_info->key;
2613                 salt = chacha20_poly1305_info->salt;
2614                 salt_size = TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE;
2615                 cipher_name = "rfc7539(chacha20,poly1305)";
2616                 break;
2617         }
2618         case TLS_CIPHER_SM4_GCM: {
2619                 struct tls12_crypto_info_sm4_gcm *sm4_gcm_info;
2620
2621                 sm4_gcm_info = (void *)crypto_info;
2622                 nonce_size = TLS_CIPHER_SM4_GCM_IV_SIZE;
2623                 tag_size = TLS_CIPHER_SM4_GCM_TAG_SIZE;
2624                 iv_size = TLS_CIPHER_SM4_GCM_IV_SIZE;
2625                 iv = sm4_gcm_info->iv;
2626                 rec_seq_size = TLS_CIPHER_SM4_GCM_REC_SEQ_SIZE;
2627                 rec_seq = sm4_gcm_info->rec_seq;
2628                 keysize = TLS_CIPHER_SM4_GCM_KEY_SIZE;
2629                 key = sm4_gcm_info->key;
2630                 salt = sm4_gcm_info->salt;
2631                 salt_size = TLS_CIPHER_SM4_GCM_SALT_SIZE;
2632                 cipher_name = "gcm(sm4)";
2633                 break;
2634         }
2635         case TLS_CIPHER_SM4_CCM: {
2636                 struct tls12_crypto_info_sm4_ccm *sm4_ccm_info;
2637
2638                 sm4_ccm_info = (void *)crypto_info;
2639                 nonce_size = TLS_CIPHER_SM4_CCM_IV_SIZE;
2640                 tag_size = TLS_CIPHER_SM4_CCM_TAG_SIZE;
2641                 iv_size = TLS_CIPHER_SM4_CCM_IV_SIZE;
2642                 iv = sm4_ccm_info->iv;
2643                 rec_seq_size = TLS_CIPHER_SM4_CCM_REC_SEQ_SIZE;
2644                 rec_seq = sm4_ccm_info->rec_seq;
2645                 keysize = TLS_CIPHER_SM4_CCM_KEY_SIZE;
2646                 key = sm4_ccm_info->key;
2647                 salt = sm4_ccm_info->salt;
2648                 salt_size = TLS_CIPHER_SM4_CCM_SALT_SIZE;
2649                 cipher_name = "ccm(sm4)";
2650                 break;
2651         }
2652         case TLS_CIPHER_ARIA_GCM_128: {
2653                 struct tls12_crypto_info_aria_gcm_128 *aria_gcm_128_info;
2654
2655                 aria_gcm_128_info = (void *)crypto_info;
2656                 nonce_size = TLS_CIPHER_ARIA_GCM_128_IV_SIZE;
2657                 tag_size = TLS_CIPHER_ARIA_GCM_128_TAG_SIZE;
2658                 iv_size = TLS_CIPHER_ARIA_GCM_128_IV_SIZE;
2659                 iv = aria_gcm_128_info->iv;
2660                 rec_seq_size = TLS_CIPHER_ARIA_GCM_128_REC_SEQ_SIZE;
2661                 rec_seq = aria_gcm_128_info->rec_seq;
2662                 keysize = TLS_CIPHER_ARIA_GCM_128_KEY_SIZE;
2663                 key = aria_gcm_128_info->key;
2664                 salt = aria_gcm_128_info->salt;
2665                 salt_size = TLS_CIPHER_ARIA_GCM_128_SALT_SIZE;
2666                 cipher_name = "gcm(aria)";
2667                 break;
2668         }
2669         case TLS_CIPHER_ARIA_GCM_256: {
2670                 struct tls12_crypto_info_aria_gcm_256 *gcm_256_info;
2671
2672                 gcm_256_info = (void *)crypto_info;
2673                 nonce_size = TLS_CIPHER_ARIA_GCM_256_IV_SIZE;
2674                 tag_size = TLS_CIPHER_ARIA_GCM_256_TAG_SIZE;
2675                 iv_size = TLS_CIPHER_ARIA_GCM_256_IV_SIZE;
2676                 iv = gcm_256_info->iv;
2677                 rec_seq_size = TLS_CIPHER_ARIA_GCM_256_REC_SEQ_SIZE;
2678                 rec_seq = gcm_256_info->rec_seq;
2679                 keysize = TLS_CIPHER_ARIA_GCM_256_KEY_SIZE;
2680                 key = gcm_256_info->key;
2681                 salt = gcm_256_info->salt;
2682                 salt_size = TLS_CIPHER_ARIA_GCM_256_SALT_SIZE;
2683                 cipher_name = "gcm(aria)";
2684                 break;
2685         }
2686         default:
2687                 rc = -EINVAL;
2688                 goto free_priv;
2689         }
2690
2691         if (crypto_info->version == TLS_1_3_VERSION) {
2692                 nonce_size = 0;
2693                 prot->aad_size = TLS_HEADER_SIZE;
2694                 prot->tail_size = 1;
2695         } else {
2696                 prot->aad_size = TLS_AAD_SPACE_SIZE;
2697                 prot->tail_size = 0;
2698         }
2699
2700         /* Sanity-check the sizes for stack allocations. */
2701         if (iv_size > MAX_IV_SIZE || nonce_size > MAX_IV_SIZE ||
2702             rec_seq_size > TLS_MAX_REC_SEQ_SIZE || tag_size != TLS_TAG_SIZE ||
2703             prot->aad_size > TLS_MAX_AAD_SIZE) {
2704                 rc = -EINVAL;
2705                 goto free_priv;
2706         }
2707
2708         prot->version = crypto_info->version;
2709         prot->cipher_type = crypto_info->cipher_type;
2710         prot->prepend_size = TLS_HEADER_SIZE + nonce_size;
2711         prot->tag_size = tag_size;
2712         prot->overhead_size = prot->prepend_size +
2713                               prot->tag_size + prot->tail_size;
2714         prot->iv_size = iv_size;
2715         prot->salt_size = salt_size;
2716         cctx->iv = kmalloc(iv_size + salt_size, GFP_KERNEL);
2717         if (!cctx->iv) {
2718                 rc = -ENOMEM;
2719                 goto free_priv;
2720         }
2721         /* Note: 128 & 256 bit salt are the same size */
2722         prot->rec_seq_size = rec_seq_size;
2723         memcpy(cctx->iv, salt, salt_size);
2724         memcpy(cctx->iv + salt_size, iv, iv_size);
2725         cctx->rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL);
2726         if (!cctx->rec_seq) {
2727                 rc = -ENOMEM;
2728                 goto free_iv;
2729         }
2730
2731         if (!*aead) {
2732                 *aead = crypto_alloc_aead(cipher_name, 0, 0);
2733                 if (IS_ERR(*aead)) {
2734                         rc = PTR_ERR(*aead);
2735                         *aead = NULL;
2736                         goto free_rec_seq;
2737                 }
2738         }
2739
2740         ctx->push_pending_record = tls_sw_push_pending_record;
2741
2742         rc = crypto_aead_setkey(*aead, key, keysize);
2743
2744         if (rc)
2745                 goto free_aead;
2746
2747         rc = crypto_aead_setauthsize(*aead, prot->tag_size);
2748         if (rc)
2749                 goto free_aead;
2750
2751         if (sw_ctx_rx) {
2752                 tfm = crypto_aead_tfm(sw_ctx_rx->aead_recv);
2753
2754                 tls_update_rx_zc_capable(ctx);
2755                 sw_ctx_rx->async_capable =
2756                         crypto_info->version != TLS_1_3_VERSION &&
2757                         !!(tfm->__crt_alg->cra_flags & CRYPTO_ALG_ASYNC);
2758
2759                 rc = tls_strp_init(&sw_ctx_rx->strp, sk);
2760                 if (rc)
2761                         goto free_aead;
2762         }
2763
2764         goto out;
2765
2766 free_aead:
2767         crypto_free_aead(*aead);
2768         *aead = NULL;
2769 free_rec_seq:
2770         kfree(cctx->rec_seq);
2771         cctx->rec_seq = NULL;
2772 free_iv:
2773         kfree(cctx->iv);
2774         cctx->iv = NULL;
2775 free_priv:
2776         if (tx) {
2777                 kfree(ctx->priv_ctx_tx);
2778                 ctx->priv_ctx_tx = NULL;
2779         } else {
2780                 kfree(ctx->priv_ctx_rx);
2781                 ctx->priv_ctx_rx = NULL;
2782         }
2783 out:
2784         return rc;
2785 }