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