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 #define MAX_IV_SIZE     TLS_CIPHER_AES_GCM_128_IV_SIZE
  46
  47 static int __skb_nsg(struct sk_buff *skb, int offset, int len,
  48                      unsigned int recursion_level)
  49 {
  50         int start = skb_headlen(skb);
  51         int i, chunk = start - offset;
  52         struct sk_buff *frag_iter;
  53         int elt = 0;
  54
  55         if (unlikely(recursion_level >= 24))
  56                 return -EMSGSIZE;
  57
  58         if (chunk > 0) {
  59                 if (chunk > len)
  60                         chunk = len;
  61                 elt++;
  62                 len -= chunk;
  63                 if (len == 0)
  64                         return elt;
  65                 offset += chunk;
  66         }
  67
  68         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
  69                 int end;
  70
  71                 WARN_ON(start > offset + len);
  72
  73                 end = start + skb_frag_size(&skb_shinfo(skb)->frags[i]);
  74                 chunk = end - offset;
  75                 if (chunk > 0) {
  76                         if (chunk > len)
  77                                 chunk = len;
  78                         elt++;
  79                         len -= chunk;
  80                         if (len == 0)
  81                                 return elt;
  82                         offset += chunk;
  83                 }
  84                 start = end;
  85         }
  86
  87         if (unlikely(skb_has_frag_list(skb))) {
  88                 skb_walk_frags(skb, frag_iter) {
  89                         int end, ret;
  90
  91                         WARN_ON(start > offset + len);
  92
  93                         end = start + frag_iter->len;
  94                         chunk = end - offset;
  95                         if (chunk > 0) {
  96                                 if (chunk > len)
  97                                         chunk = len;
  98                                 ret = __skb_nsg(frag_iter, offset - start, chunk,
  99                                                 recursion_level + 1);
 100                                 if (unlikely(ret < 0))
 101                                         return ret;
 102                                 elt += ret;
 103                                 len -= chunk;
 104                                 if (len == 0)
 105                                         return elt;
 106                                 offset += chunk;
 107                         }
 108                         start = end;
 109                 }
 110         }
 111         BUG_ON(len);
 112         return elt;
 113 }
 114
 115 /* Return the number of scatterlist elements required to completely map the
 116  * skb, or -EMSGSIZE if the recursion depth is exceeded.
 117  */
 118 static int skb_nsg(struct sk_buff *skb, int offset, int len)
 119 {
 120         return __skb_nsg(skb, offset, len, 0);
 121 }
 122
 123 static void tls_decrypt_done(struct crypto_async_request *req, int err)
 124 {
 125         struct aead_request *aead_req = (struct aead_request *)req;
 126         struct scatterlist *sgout = aead_req->dst;
 127         struct tls_sw_context_rx *ctx;
 128         struct tls_context *tls_ctx;
 129         struct scatterlist *sg;
 130         struct sk_buff *skb;
 131         unsigned int pages;
 132         int pending;
 133
 134         skb = (struct sk_buff *)req->data;
 135         tls_ctx = tls_get_ctx(skb->sk);
 136         ctx = tls_sw_ctx_rx(tls_ctx);
 137         pending = atomic_dec_return(&ctx->decrypt_pending);
 138
 139         /* Propagate if there was an err */
 140         if (err) {
 141                 ctx->async_wait.err = err;
 142                 tls_err_abort(skb->sk, err);
 143         }
 144
 145         /* After using skb->sk to propagate sk through crypto async callback
 146          * we need to NULL it again.
 147          */
 148         skb->sk = NULL;
 149
 150         /* Release the skb, pages and memory allocated for crypto req */
 151         kfree_skb(skb);
 152
 153         /* Skip the first S/G entry as it points to AAD */
 154         for_each_sg(sg_next(sgout), sg, UINT_MAX, pages) {
 155                 if (!sg)
 156                         break;
 157                 put_page(sg_page(sg));
 158         }
 159
 160         kfree(aead_req);
 161
 162         if (!pending && READ_ONCE(ctx->async_notify))
 163                 complete(&ctx->async_wait.completion);
 164 }
 165
 166 static int tls_do_decryption(struct sock *sk,
 167                              struct sk_buff *skb,
 168                              struct scatterlist *sgin,
 169                              struct scatterlist *sgout,
 170                              char *iv_recv,
 171                              size_t data_len,
 172                              struct aead_request *aead_req,
 173                              bool async)
 174 {
 175         struct tls_context *tls_ctx = tls_get_ctx(sk);
 176         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
 177         int ret;
 178
 179         aead_request_set_tfm(aead_req, ctx->aead_recv);
 180         aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE);
 181         aead_request_set_crypt(aead_req, sgin, sgout,
 182                                data_len + tls_ctx->rx.tag_size,
 183                                (u8 *)iv_recv);
 184
 185         if (async) {
 186                 /* Using skb->sk to push sk through to crypto async callback
 187                  * handler. This allows propagating errors up to the socket
 188                  * if needed. It _must_ be cleared in the async handler
 189                  * before kfree_skb is called. We _know_ skb->sk is NULL
 190                  * because it is a clone from strparser.
 191                  */
 192                 skb->sk = sk;
 193                 aead_request_set_callback(aead_req,
 194                                           CRYPTO_TFM_REQ_MAY_BACKLOG,
 195                                           tls_decrypt_done, skb);
 196                 atomic_inc(&ctx->decrypt_pending);
 197         } else {
 198                 aead_request_set_callback(aead_req,
 199                                           CRYPTO_TFM_REQ_MAY_BACKLOG,
 200                                           crypto_req_done, &ctx->async_wait);
 201         }
 202
 203         ret = crypto_aead_decrypt(aead_req);
 204         if (ret == -EINPROGRESS) {
 205                 if (async)
 206                         return ret;
 207
 208                 ret = crypto_wait_req(ret, &ctx->async_wait);
 209         }
 210
 211         if (async)
 212                 atomic_dec(&ctx->decrypt_pending);
 213
 214         return ret;
 215 }
 216
 217 static void tls_trim_both_msgs(struct sock *sk, int target_size)
 218 {
 219         struct tls_context *tls_ctx = tls_get_ctx(sk);
 220         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 221         struct tls_rec *rec = ctx->open_rec;
 222
 223         sk_msg_trim(sk, &rec->msg_plaintext, target_size);
 224         if (target_size > 0)
 225                 target_size += tls_ctx->tx.overhead_size;
 226         sk_msg_trim(sk, &rec->msg_encrypted, target_size);
 227 }
 228
 229 static int tls_alloc_encrypted_msg(struct sock *sk, int len)
 230 {
 231         struct tls_context *tls_ctx = tls_get_ctx(sk);
 232         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 233         struct tls_rec *rec = ctx->open_rec;
 234         struct sk_msg *msg_en = &rec->msg_encrypted;
 235
 236         return sk_msg_alloc(sk, msg_en, len, 0);
 237 }
 238
 239 static int tls_clone_plaintext_msg(struct sock *sk, int required)
 240 {
 241         struct tls_context *tls_ctx = tls_get_ctx(sk);
 242         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 243         struct tls_rec *rec = ctx->open_rec;
 244         struct sk_msg *msg_pl = &rec->msg_plaintext;
 245         struct sk_msg *msg_en = &rec->msg_encrypted;
 246         int skip, len;
 247
 248         /* We add page references worth len bytes from encrypted sg
 249          * at the end of plaintext sg. It is guaranteed that msg_en
 250          * has enough required room (ensured by caller).
 251          */
 252         len = required - msg_pl->sg.size;
 253
 254         /* Skip initial bytes in msg_en's data to be able to use
 255          * same offset of both plain and encrypted data.
 256          */
 257         skip = tls_ctx->tx.prepend_size + msg_pl->sg.size;
 258
 259         return sk_msg_clone(sk, msg_pl, msg_en, skip, len);
 260 }
 261
 262 static struct tls_rec *tls_get_rec(struct sock *sk)
 263 {
 264         struct tls_context *tls_ctx = tls_get_ctx(sk);
 265         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 266         struct sk_msg *msg_pl, *msg_en;
 267         struct tls_rec *rec;
 268         int mem_size;
 269
 270         mem_size = sizeof(struct tls_rec) + crypto_aead_reqsize(ctx->aead_send);
 271
 272         rec = kzalloc(mem_size, sk->sk_allocation);
 273         if (!rec)
 274                 return NULL;
 275
 276         msg_pl = &rec->msg_plaintext;
 277         msg_en = &rec->msg_encrypted;
 278
 279         sk_msg_init(msg_pl);
 280         sk_msg_init(msg_en);
 281
 282         sg_init_table(rec->sg_aead_in, 2);
 283         sg_set_buf(&rec->sg_aead_in[0], rec->aad_space,
 284                    sizeof(rec->aad_space));
 285         sg_unmark_end(&rec->sg_aead_in[1]);
 286
 287         sg_init_table(rec->sg_aead_out, 2);
 288         sg_set_buf(&rec->sg_aead_out[0], rec->aad_space,
 289                    sizeof(rec->aad_space));
 290         sg_unmark_end(&rec->sg_aead_out[1]);
 291
 292         return rec;
 293 }
 294
 295 static void tls_free_rec(struct sock *sk, struct tls_rec *rec)
 296 {
 297         sk_msg_free(sk, &rec->msg_encrypted);
 298         sk_msg_free(sk, &rec->msg_plaintext);
 299         kfree(rec);
 300 }
 301
 302 static void tls_free_open_rec(struct sock *sk)
 303 {
 304         struct tls_context *tls_ctx = tls_get_ctx(sk);
 305         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 306         struct tls_rec *rec = ctx->open_rec;
 307
 308         if (rec) {
 309                 tls_free_rec(sk, rec);
 310                 ctx->open_rec = NULL;
 311         }
 312 }
 313
 314 int tls_tx_records(struct sock *sk, int flags)
 315 {
 316         struct tls_context *tls_ctx = tls_get_ctx(sk);
 317         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 318         struct tls_rec *rec, *tmp;
 319         struct sk_msg *msg_en;
 320         int tx_flags, rc = 0;
 321
 322         if (tls_is_partially_sent_record(tls_ctx)) {
 323                 rec = list_first_entry(&ctx->tx_list,
 324                                        struct tls_rec, list);
 325
 326                 if (flags == -1)
 327                         tx_flags = rec->tx_flags;
 328                 else
 329                         tx_flags = flags;
 330
 331                 rc = tls_push_partial_record(sk, tls_ctx, tx_flags);
 332                 if (rc)
 333                         goto tx_err;
 334
 335                 /* Full record has been transmitted.
 336                  * Remove the head of tx_list
 337                  */
 338                 list_del(&rec->list);
 339                 sk_msg_free(sk, &rec->msg_plaintext);
 340                 kfree(rec);
 341         }
 342
 343         /* Tx all ready records */
 344         list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) {
 345                 if (READ_ONCE(rec->tx_ready)) {
 346                         if (flags == -1)
 347                                 tx_flags = rec->tx_flags;
 348                         else
 349                                 tx_flags = flags;
 350
 351                         msg_en = &rec->msg_encrypted;
 352                         rc = tls_push_sg(sk, tls_ctx,
 353                                          &msg_en->sg.data[msg_en->sg.curr],
 354                                          0, tx_flags);
 355                         if (rc)
 356                                 goto tx_err;
 357
 358                         list_del(&rec->list);
 359                         sk_msg_free(sk, &rec->msg_plaintext);
 360                         kfree(rec);
 361                 } else {
 362                         break;
 363                 }
 364         }
 365
 366 tx_err:
 367         if (rc < 0 && rc != -EAGAIN)
 368                 tls_err_abort(sk, EBADMSG);
 369
 370         return rc;
 371 }
 372
 373 static void tls_encrypt_done(struct crypto_async_request *req, int err)
 374 {
 375         struct aead_request *aead_req = (struct aead_request *)req;
 376         struct sock *sk = req->data;
 377         struct tls_context *tls_ctx = tls_get_ctx(sk);
 378         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 379         struct scatterlist *sge;
 380         struct sk_msg *msg_en;
 381         struct tls_rec *rec;
 382         bool ready = false;
 383         int pending;
 384
 385         rec = container_of(aead_req, struct tls_rec, aead_req);
 386         msg_en = &rec->msg_encrypted;
 387
 388         sge = sk_msg_elem(msg_en, msg_en->sg.curr);
 389         sge->offset -= tls_ctx->tx.prepend_size;
 390         sge->length += tls_ctx->tx.prepend_size;
 391
 392         /* Check if error is previously set on socket */
 393         if (err || sk->sk_err) {
 394                 rec = NULL;
 395
 396                 /* If err is already set on socket, return the same code */
 397                 if (sk->sk_err) {
 398                         ctx->async_wait.err = sk->sk_err;
 399                 } else {
 400                         ctx->async_wait.err = err;
 401                         tls_err_abort(sk, err);
 402                 }
 403         }
 404
 405         if (rec) {
 406                 struct tls_rec *first_rec;
 407
 408                 /* Mark the record as ready for transmission */
 409                 smp_store_mb(rec->tx_ready, true);
 410
 411                 /* If received record is at head of tx_list, schedule tx */
 412                 first_rec = list_first_entry(&ctx->tx_list,
 413                                              struct tls_rec, list);
 414                 if (rec == first_rec)
 415                         ready = true;
 416         }
 417
 418         pending = atomic_dec_return(&ctx->encrypt_pending);
 419
 420         if (!pending && READ_ONCE(ctx->async_notify))
 421                 complete(&ctx->async_wait.completion);
 422
 423         if (!ready)
 424                 return;
 425
 426         /* Schedule the transmission */
 427         if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask))
 428                 schedule_delayed_work(&ctx->tx_work.work, 1);
 429 }
 430
 431 static int tls_do_encryption(struct sock *sk,
 432                              struct tls_context *tls_ctx,
 433                              struct tls_sw_context_tx *ctx,
 434                              struct aead_request *aead_req,
 435                              size_t data_len, u32 start)
 436 {
 437         struct tls_rec *rec = ctx->open_rec;
 438         struct sk_msg *msg_en = &rec->msg_encrypted;
 439         struct scatterlist *sge = sk_msg_elem(msg_en, start);
 440         int rc;
 441
 442         sge->offset += tls_ctx->tx.prepend_size;
 443         sge->length -= tls_ctx->tx.prepend_size;
 444
 445         msg_en->sg.curr = start;
 446
 447         aead_request_set_tfm(aead_req, ctx->aead_send);
 448         aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE);
 449         aead_request_set_crypt(aead_req, rec->sg_aead_in,
 450                                rec->sg_aead_out,
 451                                data_len, tls_ctx->tx.iv);
 452
 453         aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
 454                                   tls_encrypt_done, sk);
 455
 456         /* Add the record in tx_list */
 457         list_add_tail((struct list_head *)&rec->list, &ctx->tx_list);
 458         atomic_inc(&ctx->encrypt_pending);
 459
 460         rc = crypto_aead_encrypt(aead_req);
 461         if (!rc || rc != -EINPROGRESS) {
 462                 atomic_dec(&ctx->encrypt_pending);
 463                 sge->offset -= tls_ctx->tx.prepend_size;
 464                 sge->length += tls_ctx->tx.prepend_size;
 465         }
 466
 467         if (!rc) {
 468                 WRITE_ONCE(rec->tx_ready, true);
 469         } else if (rc != -EINPROGRESS) {
 470                 list_del(&rec->list);
 471                 return rc;
 472         }
 473
 474         /* Unhook the record from context if encryption is not failure */
 475         ctx->open_rec = NULL;
 476         tls_advance_record_sn(sk, &tls_ctx->tx);
 477         return rc;
 478 }
 479
 480 static int tls_split_open_record(struct sock *sk, struct tls_rec *from,
 481                                  struct tls_rec **to, struct sk_msg *msg_opl,
 482                                  struct sk_msg *msg_oen, u32 split_point,
 483                                  u32 tx_overhead_size, u32 *orig_end)
 484 {
 485         u32 i, j, bytes = 0, apply = msg_opl->apply_bytes;
 486         struct scatterlist *sge, *osge, *nsge;
 487         u32 orig_size = msg_opl->sg.size;
 488         struct scatterlist tmp = { };
 489         struct sk_msg *msg_npl;
 490         struct tls_rec *new;
 491         int ret;
 492
 493         new = tls_get_rec(sk);
 494         if (!new)
 495                 return -ENOMEM;
 496         ret = sk_msg_alloc(sk, &new->msg_encrypted, msg_opl->sg.size +
 497                            tx_overhead_size, 0);
 498         if (ret < 0) {
 499                 tls_free_rec(sk, new);
 500                 return ret;
 501         }
 502
 503         *orig_end = msg_opl->sg.end;
 504         i = msg_opl->sg.start;
 505         sge = sk_msg_elem(msg_opl, i);
 506         while (apply && sge->length) {
 507                 if (sge->length > apply) {
 508                         u32 len = sge->length - apply;
 509
 510                         get_page(sg_page(sge));
 511                         sg_set_page(&tmp, sg_page(sge), len,
 512                                     sge->offset + apply);
 513                         sge->length = apply;
 514                         bytes += apply;
 515                         apply = 0;
 516                 } else {
 517                         apply -= sge->length;
 518                         bytes += sge->length;
 519                 }
 520
 521                 sk_msg_iter_var_next(i);
 522                 if (i == msg_opl->sg.end)
 523                         break;
 524                 sge = sk_msg_elem(msg_opl, i);
 525         }
 526
 527         msg_opl->sg.end = i;
 528         msg_opl->sg.curr = i;
 529         msg_opl->sg.copybreak = 0;
 530         msg_opl->apply_bytes = 0;
 531         msg_opl->sg.size = bytes;
 532
 533         msg_npl = &new->msg_plaintext;
 534         msg_npl->apply_bytes = apply;
 535         msg_npl->sg.size = orig_size - bytes;
 536
 537         j = msg_npl->sg.start;
 538         nsge = sk_msg_elem(msg_npl, j);
 539         if (tmp.length) {
 540                 memcpy(nsge, &tmp, sizeof(*nsge));
 541                 sk_msg_iter_var_next(j);
 542                 nsge = sk_msg_elem(msg_npl, j);
 543         }
 544
 545         osge = sk_msg_elem(msg_opl, i);
 546         while (osge->length) {
 547                 memcpy(nsge, osge, sizeof(*nsge));
 548                 sg_unmark_end(nsge);
 549                 sk_msg_iter_var_next(i);
 550                 sk_msg_iter_var_next(j);
 551                 if (i == *orig_end)
 552                         break;
 553                 osge = sk_msg_elem(msg_opl, i);
 554                 nsge = sk_msg_elem(msg_npl, j);
 555         }
 556
 557         msg_npl->sg.end = j;
 558         msg_npl->sg.curr = j;
 559         msg_npl->sg.copybreak = 0;
 560
 561         *to = new;
 562         return 0;
 563 }
 564
 565 static void tls_merge_open_record(struct sock *sk, struct tls_rec *to,
 566                                   struct tls_rec *from, u32 orig_end)
 567 {
 568         struct sk_msg *msg_npl = &from->msg_plaintext;
 569         struct sk_msg *msg_opl = &to->msg_plaintext;
 570         struct scatterlist *osge, *nsge;
 571         u32 i, j;
 572
 573         i = msg_opl->sg.end;
 574         sk_msg_iter_var_prev(i);
 575         j = msg_npl->sg.start;
 576
 577         osge = sk_msg_elem(msg_opl, i);
 578         nsge = sk_msg_elem(msg_npl, j);
 579
 580         if (sg_page(osge) == sg_page(nsge) &&
 581             osge->offset + osge->length == nsge->offset) {
 582                 osge->length += nsge->length;
 583                 put_page(sg_page(nsge));
 584         }
 585
 586         msg_opl->sg.end = orig_end;
 587         msg_opl->sg.curr = orig_end;
 588         msg_opl->sg.copybreak = 0;
 589         msg_opl->apply_bytes = msg_opl->sg.size + msg_npl->sg.size;
 590         msg_opl->sg.size += msg_npl->sg.size;
 591
 592         sk_msg_free(sk, &to->msg_encrypted);
 593         sk_msg_xfer_full(&to->msg_encrypted, &from->msg_encrypted);
 594
 595         kfree(from);
 596 }
 597
 598 static int tls_push_record(struct sock *sk, int flags,
 599                            unsigned char record_type)
 600 {
 601         struct tls_context *tls_ctx = tls_get_ctx(sk);
 602         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 603         struct tls_rec *rec = ctx->open_rec, *tmp = NULL;
 604         u32 i, split_point, uninitialized_var(orig_end);
 605         struct sk_msg *msg_pl, *msg_en;
 606         struct aead_request *req;
 607         bool split;
 608         int rc;
 609
 610         if (!rec)
 611                 return 0;
 612
 613         msg_pl = &rec->msg_plaintext;
 614         msg_en = &rec->msg_encrypted;
 615
 616         split_point = msg_pl->apply_bytes;
 617         split = split_point && split_point < msg_pl->sg.size;
 618         if (split) {
 619                 rc = tls_split_open_record(sk, rec, &tmp, msg_pl, msg_en,
 620                                            split_point, tls_ctx->tx.overhead_size,
 621                                            &orig_end);
 622                 if (rc < 0)
 623                         return rc;
 624                 sk_msg_trim(sk, msg_en, msg_pl->sg.size +
 625                             tls_ctx->tx.overhead_size);
 626         }
 627
 628         rec->tx_flags = flags;
 629         req = &rec->aead_req;
 630
 631         i = msg_pl->sg.end;
 632         sk_msg_iter_var_prev(i);
 633         sg_mark_end(sk_msg_elem(msg_pl, i));
 634
 635         i = msg_pl->sg.start;
 636         sg_chain(rec->sg_aead_in, 2, rec->inplace_crypto ?
 637                  &msg_en->sg.data[i] : &msg_pl->sg.data[i]);
 638
 639         i = msg_en->sg.end;
 640         sk_msg_iter_var_prev(i);
 641         sg_mark_end(sk_msg_elem(msg_en, i));
 642
 643         i = msg_en->sg.start;
 644         sg_chain(rec->sg_aead_out, 2, &msg_en->sg.data[i]);
 645
 646         tls_make_aad(rec->aad_space, msg_pl->sg.size,
 647                      tls_ctx->tx.rec_seq, tls_ctx->tx.rec_seq_size,
 648                      record_type);
 649
 650         tls_fill_prepend(tls_ctx,
 651                          page_address(sg_page(&msg_en->sg.data[i])) +
 652                          msg_en->sg.data[i].offset, msg_pl->sg.size,
 653                          record_type);
 654
 655         tls_ctx->pending_open_record_frags = false;
 656
 657         rc = tls_do_encryption(sk, tls_ctx, ctx, req, msg_pl->sg.size, i);
 658         if (rc < 0) {
 659                 if (rc != -EINPROGRESS) {
 660                         tls_err_abort(sk, EBADMSG);
 661                         if (split) {
 662                                 tls_ctx->pending_open_record_frags = true;
 663                                 tls_merge_open_record(sk, rec, tmp, orig_end);
 664                         }
 665                 }
 666                 return rc;
 667         } else if (split) {
 668                 msg_pl = &tmp->msg_plaintext;
 669                 msg_en = &tmp->msg_encrypted;
 670                 sk_msg_trim(sk, msg_en, msg_pl->sg.size +
 671                             tls_ctx->tx.overhead_size);
 672                 tls_ctx->pending_open_record_frags = true;
 673                 ctx->open_rec = tmp;
 674         }
 675
 676         return tls_tx_records(sk, flags);
 677 }
 678
 679 static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk,
 680                                bool full_record, u8 record_type,
 681                                size_t *copied, int flags)
 682 {
 683         struct tls_context *tls_ctx = tls_get_ctx(sk);
 684         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 685         struct sk_msg msg_redir = { };
 686         struct sk_psock *psock;
 687         struct sock *sk_redir;
 688         struct tls_rec *rec;
 689         int err = 0, send;
 690         bool enospc;
 691
 692         psock = sk_psock_get(sk);
 693         if (!psock)
 694                 return tls_push_record(sk, flags, record_type);
 695 more_data:
 696         enospc = sk_msg_full(msg);
 697         if (psock->eval == __SK_NONE)
 698                 psock->eval = sk_psock_msg_verdict(sk, psock, msg);
 699         if (msg->cork_bytes && msg->cork_bytes > msg->sg.size &&
 700             !enospc && !full_record) {
 701                 err = -ENOSPC;
 702                 goto out_err;
 703         }
 704         msg->cork_bytes = 0;
 705         send = msg->sg.size;
 706         if (msg->apply_bytes && msg->apply_bytes < send)
 707                 send = msg->apply_bytes;
 708
 709         switch (psock->eval) {
 710         case __SK_PASS:
 711                 err = tls_push_record(sk, flags, record_type);
 712                 if (err < 0) {
 713                         *copied -= sk_msg_free(sk, msg);
 714                         tls_free_open_rec(sk);
 715                         goto out_err;
 716                 }
 717                 break;
 718         case __SK_REDIRECT:
 719                 sk_redir = psock->sk_redir;
 720                 memcpy(&msg_redir, msg, sizeof(*msg));
 721                 if (msg->apply_bytes < send)
 722                         msg->apply_bytes = 0;
 723                 else
 724                         msg->apply_bytes -= send;
 725                 sk_msg_return_zero(sk, msg, send);
 726                 msg->sg.size -= send;
 727                 release_sock(sk);
 728                 err = tcp_bpf_sendmsg_redir(sk_redir, &msg_redir, send, flags);
 729                 lock_sock(sk);
 730                 if (err < 0) {
 731                         *copied -= sk_msg_free_nocharge(sk, &msg_redir);
 732                         msg->sg.size = 0;
 733                 }
 734                 if (msg->sg.size == 0)
 735                         tls_free_open_rec(sk);
 736                 break;
 737         case __SK_DROP:
 738         default:
 739                 sk_msg_free_partial(sk, msg, send);
 740                 if (msg->apply_bytes < send)
 741                         msg->apply_bytes = 0;
 742                 else
 743                         msg->apply_bytes -= send;
 744                 if (msg->sg.size == 0)
 745                         tls_free_open_rec(sk);
 746                 *copied -= send;
 747                 err = -EACCES;
 748         }
 749
 750         if (likely(!err)) {
 751                 bool reset_eval = !ctx->open_rec;
 752
 753                 rec = ctx->open_rec;
 754                 if (rec) {
 755                         msg = &rec->msg_plaintext;
 756                         if (!msg->apply_bytes)
 757                                 reset_eval = true;
 758                 }
 759                 if (reset_eval) {
 760                         psock->eval = __SK_NONE;
 761                         if (psock->sk_redir) {
 762                                 sock_put(psock->sk_redir);
 763                                 psock->sk_redir = NULL;
 764                         }
 765                 }
 766                 if (rec)
 767                         goto more_data;
 768         }
 769  out_err:
 770         sk_psock_put(sk, psock);
 771         return err;
 772 }
 773
 774 static int tls_sw_push_pending_record(struct sock *sk, int flags)
 775 {
 776         struct tls_context *tls_ctx = tls_get_ctx(sk);
 777         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 778         struct tls_rec *rec = ctx->open_rec;
 779         struct sk_msg *msg_pl;
 780         size_t copied;
 781
 782         if (!rec)
 783                 return 0;
 784
 785         msg_pl = &rec->msg_plaintext;
 786         copied = msg_pl->sg.size;
 787         if (!copied)
 788                 return 0;
 789
 790         return bpf_exec_tx_verdict(msg_pl, sk, true, TLS_RECORD_TYPE_DATA,
 791                                    &copied, flags);
 792 }
 793
 794 int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 795 {
 796         long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
 797         struct tls_context *tls_ctx = tls_get_ctx(sk);
 798         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
 799         struct crypto_tfm *tfm = crypto_aead_tfm(ctx->aead_send);
 800         bool async_capable = tfm->__crt_alg->cra_flags & CRYPTO_ALG_ASYNC;
 801         unsigned char record_type = TLS_RECORD_TYPE_DATA;
 802         bool is_kvec = iov_iter_is_kvec(&msg->msg_iter);
 803         bool eor = !(msg->msg_flags & MSG_MORE);
 804         size_t try_to_copy, copied = 0;
 805         struct sk_msg *msg_pl, *msg_en;
 806         struct tls_rec *rec;
 807         int required_size;
 808         int num_async = 0;
 809         bool full_record;
 810         int record_room;
 811         int num_zc = 0;
 812         int orig_size;
 813         int ret = 0;
 814
 815         if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL))
 816                 return -ENOTSUPP;
 817
 818         lock_sock(sk);
 819
 820         /* Wait till there is any pending write on socket */
 821         if (unlikely(sk->sk_write_pending)) {
 822                 ret = wait_on_pending_writer(sk, &timeo);
 823                 if (unlikely(ret))
 824                         goto send_end;
 825         }
 826
 827         if (unlikely(msg->msg_controllen)) {
 828                 ret = tls_proccess_cmsg(sk, msg, &record_type);
 829                 if (ret) {
 830                         if (ret == -EINPROGRESS)
 831                                 num_async++;
 832                         else if (ret != -EAGAIN)
 833                                 goto send_end;
 834                 }
 835         }
 836
 837         while (msg_data_left(msg)) {
 838                 if (sk->sk_err) {
 839                         ret = -sk->sk_err;
 840                         goto send_end;
 841                 }
 842
 843                 if (ctx->open_rec)
 844                         rec = ctx->open_rec;
 845                 else
 846                         rec = ctx->open_rec = tls_get_rec(sk);
 847                 if (!rec) {
 848                         ret = -ENOMEM;
 849                         goto send_end;
 850                 }
 851
 852                 msg_pl = &rec->msg_plaintext;
 853                 msg_en = &rec->msg_encrypted;
 854
 855                 orig_size = msg_pl->sg.size;
 856                 full_record = false;
 857                 try_to_copy = msg_data_left(msg);
 858                 record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size;
 859                 if (try_to_copy >= record_room) {
 860                         try_to_copy = record_room;
 861                         full_record = true;
 862                 }
 863
 864                 required_size = msg_pl->sg.size + try_to_copy +
 865                                 tls_ctx->tx.overhead_size;
 866
 867                 if (!sk_stream_memory_free(sk))
 868                         goto wait_for_sndbuf;
 869
 870 alloc_encrypted:
 871                 ret = tls_alloc_encrypted_msg(sk, required_size);
 872                 if (ret) {
 873                         if (ret != -ENOSPC)
 874                                 goto wait_for_memory;
 875
 876                         /* Adjust try_to_copy according to the amount that was
 877                          * actually allocated. The difference is due
 878                          * to max sg elements limit
 879                          */
 880                         try_to_copy -= required_size - msg_en->sg.size;
 881                         full_record = true;
 882                 }
 883
 884                 if (!is_kvec && (full_record || eor) && !async_capable) {
 885                         u32 first = msg_pl->sg.end;
 886
 887                         ret = sk_msg_zerocopy_from_iter(sk, &msg->msg_iter,
 888                                                         msg_pl, try_to_copy);
 889                         if (ret)
 890                                 goto fallback_to_reg_send;
 891
 892                         rec->inplace_crypto = 0;
 893
 894                         num_zc++;
 895                         copied += try_to_copy;
 896
 897                         sk_msg_sg_copy_set(msg_pl, first);
 898                         ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
 899                                                   record_type, &copied,
 900                                                   msg->msg_flags);
 901                         if (ret) {
 902                                 if (ret == -EINPROGRESS)
 903                                         num_async++;
 904                                 else if (ret == -ENOMEM)
 905                                         goto wait_for_memory;
 906                                 else if (ret == -ENOSPC)
 907                                         goto rollback_iter;
 908                                 else if (ret != -EAGAIN)
 909                                         goto send_end;
 910                         }
 911                         continue;
 912 rollback_iter:
 913                         copied -= try_to_copy;
 914                         sk_msg_sg_copy_clear(msg_pl, first);
 915                         iov_iter_revert(&msg->msg_iter,
 916                                         msg_pl->sg.size - orig_size);
 917 fallback_to_reg_send:
 918                         sk_msg_trim(sk, msg_pl, orig_size);
 919                 }
 920
 921                 required_size = msg_pl->sg.size + try_to_copy;
 922
 923                 ret = tls_clone_plaintext_msg(sk, required_size);
 924                 if (ret) {
 925                         if (ret != -ENOSPC)
 926                                 goto send_end;
 927
 928                         /* Adjust try_to_copy according to the amount that was
 929                          * actually allocated. The difference is due
 930                          * to max sg elements limit
 931                          */
 932                         try_to_copy -= required_size - msg_pl->sg.size;
 933                         full_record = true;
 934                         sk_msg_trim(sk, msg_en, msg_pl->sg.size +
 935                                     tls_ctx->tx.overhead_size);
 936                 }
 937
 938                 ret = sk_msg_memcopy_from_iter(sk, &msg->msg_iter, msg_pl,
 939                                                try_to_copy);
 940                 if (ret < 0)
 941                         goto trim_sgl;
 942
 943                 /* Open records defined only if successfully copied, otherwise
 944                  * we would trim the sg but not reset the open record frags.
 945                  */
 946                 tls_ctx->pending_open_record_frags = true;
 947                 copied += try_to_copy;
 948                 if (full_record || eor) {
 949                         ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
 950                                                   record_type, &copied,
 951                                                   msg->msg_flags);
 952                         if (ret) {
 953                                 if (ret == -EINPROGRESS)
 954                                         num_async++;
 955                                 else if (ret == -ENOMEM)
 956                                         goto wait_for_memory;
 957                                 else if (ret != -EAGAIN) {
 958                                         if (ret == -ENOSPC)
 959                                                 ret = 0;
 960                                         goto send_end;
 961                                 }
 962                         }
 963                 }
 964
 965                 continue;
 966
 967 wait_for_sndbuf:
 968                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
 969 wait_for_memory:
 970                 ret = sk_stream_wait_memory(sk, &timeo);
 971                 if (ret) {
 972 trim_sgl:
 973                         tls_trim_both_msgs(sk, orig_size);
 974                         goto send_end;
 975                 }
 976
 977                 if (msg_en->sg.size < required_size)
 978                         goto alloc_encrypted;
 979         }
 980
 981         if (!num_async) {
 982                 goto send_end;
 983         } else if (num_zc) {
 984                 /* Wait for pending encryptions to get completed */
 985                 smp_store_mb(ctx->async_notify, true);
 986
 987                 if (atomic_read(&ctx->encrypt_pending))
 988                         crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
 989                 else
 990                         reinit_completion(&ctx->async_wait.completion);
 991
 992                 WRITE_ONCE(ctx->async_notify, false);
 993
 994                 if (ctx->async_wait.err) {
 995                         ret = ctx->async_wait.err;
 996                         copied = 0;
 997                 }
 998         }
 999
1000         /* Transmit if any encryptions have completed */
1001         if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) {
1002                 cancel_delayed_work(&ctx->tx_work.work);
1003                 tls_tx_records(sk, msg->msg_flags);
1004         }
1005
1006 send_end:
1007         ret = sk_stream_error(sk, msg->msg_flags, ret);
1008
1009         release_sock(sk);
1010         return copied ? copied : ret;
1011 }
1012
1013 int tls_sw_sendpage(struct sock *sk, struct page *page,
1014                     int offset, size_t size, int flags)
1015 {
1016         long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1017         struct tls_context *tls_ctx = tls_get_ctx(sk);
1018         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
1019         unsigned char record_type = TLS_RECORD_TYPE_DATA;
1020         struct sk_msg *msg_pl;
1021         struct tls_rec *rec;
1022         int num_async = 0;
1023         size_t copied = 0;
1024         bool full_record;
1025         int record_room;
1026         int ret = 0;
1027         bool eor;
1028
1029         if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
1030                       MSG_SENDPAGE_NOTLAST))
1031                 return -ENOTSUPP;
1032
1033         /* No MSG_EOR from splice, only look at MSG_MORE */
1034         eor = !(flags & (MSG_MORE | MSG_SENDPAGE_NOTLAST));
1035
1036         lock_sock(sk);
1037
1038         sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1039
1040         /* Wait till there is any pending write on socket */
1041         if (unlikely(sk->sk_write_pending)) {
1042                 ret = wait_on_pending_writer(sk, &timeo);
1043                 if (unlikely(ret))
1044                         goto sendpage_end;
1045         }
1046
1047         /* Call the sk_stream functions to manage the sndbuf mem. */
1048         while (size > 0) {
1049                 size_t copy, required_size;
1050
1051                 if (sk->sk_err) {
1052                         ret = -sk->sk_err;
1053                         goto sendpage_end;
1054                 }
1055
1056                 if (ctx->open_rec)
1057                         rec = ctx->open_rec;
1058                 else
1059                         rec = ctx->open_rec = tls_get_rec(sk);
1060                 if (!rec) {
1061                         ret = -ENOMEM;
1062                         goto sendpage_end;
1063                 }
1064
1065                 msg_pl = &rec->msg_plaintext;
1066
1067                 full_record = false;
1068                 record_room = TLS_MAX_PAYLOAD_SIZE - msg_pl->sg.size;
1069                 copied = 0;
1070                 copy = size;
1071                 if (copy >= record_room) {
1072                         copy = record_room;
1073                         full_record = true;
1074                 }
1075
1076                 required_size = msg_pl->sg.size + copy +
1077                                 tls_ctx->tx.overhead_size;
1078
1079                 if (!sk_stream_memory_free(sk))
1080                         goto wait_for_sndbuf;
1081 alloc_payload:
1082                 ret = tls_alloc_encrypted_msg(sk, required_size);
1083                 if (ret) {
1084                         if (ret != -ENOSPC)
1085                                 goto wait_for_memory;
1086
1087                         /* Adjust copy according to the amount that was
1088                          * actually allocated. The difference is due
1089                          * to max sg elements limit
1090                          */
1091                         copy -= required_size - msg_pl->sg.size;
1092                         full_record = true;
1093                 }
1094
1095                 sk_msg_page_add(msg_pl, page, copy, offset);
1096                 sk_mem_charge(sk, copy);
1097
1098                 offset += copy;
1099                 size -= copy;
1100                 copied += copy;
1101
1102                 tls_ctx->pending_open_record_frags = true;
1103                 if (full_record || eor || sk_msg_full(msg_pl)) {
1104                         rec->inplace_crypto = 0;
1105                         ret = bpf_exec_tx_verdict(msg_pl, sk, full_record,
1106                                                   record_type, &copied, flags);
1107                         if (ret) {
1108                                 if (ret == -EINPROGRESS)
1109                                         num_async++;
1110                                 else if (ret == -ENOMEM)
1111                                         goto wait_for_memory;
1112                                 else if (ret != -EAGAIN) {
1113                                         if (ret == -ENOSPC)
1114                                                 ret = 0;
1115                                         goto sendpage_end;
1116                                 }
1117                         }
1118                 }
1119                 continue;
1120 wait_for_sndbuf:
1121                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1122 wait_for_memory:
1123                 ret = sk_stream_wait_memory(sk, &timeo);
1124                 if (ret) {
1125                         tls_trim_both_msgs(sk, msg_pl->sg.size);
1126                         goto sendpage_end;
1127                 }
1128
1129                 goto alloc_payload;
1130         }
1131
1132         if (num_async) {
1133                 /* Transmit if any encryptions have completed */
1134                 if (test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask)) {
1135                         cancel_delayed_work(&ctx->tx_work.work);
1136                         tls_tx_records(sk, flags);
1137                 }
1138         }
1139 sendpage_end:
1140         ret = sk_stream_error(sk, flags, ret);
1141         release_sock(sk);
1142         return copied ? copied : ret;
1143 }
1144
1145 static struct sk_buff *tls_wait_data(struct sock *sk, struct sk_psock *psock,
1146                                      int flags, long timeo, int *err)
1147 {
1148         struct tls_context *tls_ctx = tls_get_ctx(sk);
1149         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1150         struct sk_buff *skb;
1151         DEFINE_WAIT_FUNC(wait, woken_wake_function);
1152
1153         while (!(skb = ctx->recv_pkt) && sk_psock_queue_empty(psock)) {
1154                 if (sk->sk_err) {
1155                         *err = sock_error(sk);
1156                         return NULL;
1157                 }
1158
1159                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1160                         return NULL;
1161
1162                 if (sock_flag(sk, SOCK_DONE))
1163                         return NULL;
1164
1165                 if ((flags & MSG_DONTWAIT) || !timeo) {
1166                         *err = -EAGAIN;
1167                         return NULL;
1168                 }
1169
1170                 add_wait_queue(sk_sleep(sk), &wait);
1171                 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1172                 sk_wait_event(sk, &timeo,
1173                               ctx->recv_pkt != skb ||
1174                               !sk_psock_queue_empty(psock),
1175                               &wait);
1176                 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1177                 remove_wait_queue(sk_sleep(sk), &wait);
1178
1179                 /* Handle signals */
1180                 if (signal_pending(current)) {
1181                         *err = sock_intr_errno(timeo);
1182                         return NULL;
1183                 }
1184         }
1185
1186         return skb;
1187 }
1188
1189 static int tls_setup_from_iter(struct sock *sk, struct iov_iter *from,
1190                                int length, int *pages_used,
1191                                unsigned int *size_used,
1192                                struct scatterlist *to,
1193                                int to_max_pages)
1194 {
1195         int rc = 0, i = 0, num_elem = *pages_used, maxpages;
1196         struct page *pages[MAX_SKB_FRAGS];
1197         unsigned int size = *size_used;
1198         ssize_t copied, use;
1199         size_t offset;
1200
1201         while (length > 0) {
1202                 i = 0;
1203                 maxpages = to_max_pages - num_elem;
1204                 if (maxpages == 0) {
1205                         rc = -EFAULT;
1206                         goto out;
1207                 }
1208                 copied = iov_iter_get_pages(from, pages,
1209                                             length,
1210                                             maxpages, &offset);
1211                 if (copied <= 0) {
1212                         rc = -EFAULT;
1213                         goto out;
1214                 }
1215
1216                 iov_iter_advance(from, copied);
1217
1218                 length -= copied;
1219                 size += copied;
1220                 while (copied) {
1221                         use = min_t(int, copied, PAGE_SIZE - offset);
1222
1223                         sg_set_page(&to[num_elem],
1224                                     pages[i], use, offset);
1225                         sg_unmark_end(&to[num_elem]);
1226                         /* We do not uncharge memory from this API */
1227
1228                         offset = 0;
1229                         copied -= use;
1230
1231                         i++;
1232                         num_elem++;
1233                 }
1234         }
1235         /* Mark the end in the last sg entry if newly added */
1236         if (num_elem > *pages_used)
1237                 sg_mark_end(&to[num_elem - 1]);
1238 out:
1239         if (rc)
1240                 iov_iter_revert(from, size - *size_used);
1241         *size_used = size;
1242         *pages_used = num_elem;
1243
1244         return rc;
1245 }
1246
1247 /* This function decrypts the input skb into either out_iov or in out_sg
1248  * or in skb buffers itself. The input parameter 'zc' indicates if
1249  * zero-copy mode needs to be tried or not. With zero-copy mode, either
1250  * out_iov or out_sg must be non-NULL. In case both out_iov and out_sg are
1251  * NULL, then the decryption happens inside skb buffers itself, i.e.
1252  * zero-copy gets disabled and 'zc' is updated.
1253  */
1254
1255 static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
1256                             struct iov_iter *out_iov,
1257                             struct scatterlist *out_sg,
1258                             int *chunk, bool *zc)
1259 {
1260         struct tls_context *tls_ctx = tls_get_ctx(sk);
1261         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1262         struct strp_msg *rxm = strp_msg(skb);
1263         int n_sgin, n_sgout, nsg, mem_size, aead_size, err, pages = 0;
1264         struct aead_request *aead_req;
1265         struct sk_buff *unused;
1266         u8 *aad, *iv, *mem = NULL;
1267         struct scatterlist *sgin = NULL;
1268         struct scatterlist *sgout = NULL;
1269         const int data_len = rxm->full_len - tls_ctx->rx.overhead_size;
1270
1271         if (*zc && (out_iov || out_sg)) {
1272                 if (out_iov)
1273                         n_sgout = iov_iter_npages(out_iov, INT_MAX) + 1;
1274                 else
1275                         n_sgout = sg_nents(out_sg);
1276                 n_sgin = skb_nsg(skb, rxm->offset + tls_ctx->rx.prepend_size,
1277                                  rxm->full_len - tls_ctx->rx.prepend_size);
1278         } else {
1279                 n_sgout = 0;
1280                 *zc = false;
1281                 n_sgin = skb_cow_data(skb, 0, &unused);
1282         }
1283
1284         if (n_sgin < 1)
1285                 return -EBADMSG;
1286
1287         /* Increment to accommodate AAD */
1288         n_sgin = n_sgin + 1;
1289
1290         nsg = n_sgin + n_sgout;
1291
1292         aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv);
1293         mem_size = aead_size + (nsg * sizeof(struct scatterlist));
1294         mem_size = mem_size + TLS_AAD_SPACE_SIZE;
1295         mem_size = mem_size + crypto_aead_ivsize(ctx->aead_recv);
1296
1297         /* Allocate a single block of memory which contains
1298          * aead_req || sgin[] || sgout[] || aad || iv.
1299          * This order achieves correct alignment for aead_req, sgin, sgout.
1300          */
1301         mem = kmalloc(mem_size, sk->sk_allocation);
1302         if (!mem)
1303                 return -ENOMEM;
1304
1305         /* Segment the allocated memory */
1306         aead_req = (struct aead_request *)mem;
1307         sgin = (struct scatterlist *)(mem + aead_size);
1308         sgout = sgin + n_sgin;
1309         aad = (u8 *)(sgout + n_sgout);
1310         iv = aad + TLS_AAD_SPACE_SIZE;
1311
1312         /* Prepare IV */
1313         err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
1314                             iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
1315                             tls_ctx->rx.iv_size);
1316         if (err < 0) {
1317                 kfree(mem);
1318                 return err;
1319         }
1320         memcpy(iv, tls_ctx->rx.iv, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
1321
1322         /* Prepare AAD */
1323         tls_make_aad(aad, rxm->full_len - tls_ctx->rx.overhead_size,
1324                      tls_ctx->rx.rec_seq, tls_ctx->rx.rec_seq_size,
1325                      ctx->control);
1326
1327         /* Prepare sgin */
1328         sg_init_table(sgin, n_sgin);
1329         sg_set_buf(&sgin[0], aad, TLS_AAD_SPACE_SIZE);
1330         err = skb_to_sgvec(skb, &sgin[1],
1331                            rxm->offset + tls_ctx->rx.prepend_size,
1332                            rxm->full_len - tls_ctx->rx.prepend_size);
1333         if (err < 0) {
1334                 kfree(mem);
1335                 return err;
1336         }
1337
1338         if (n_sgout) {
1339                 if (out_iov) {
1340                         sg_init_table(sgout, n_sgout);
1341                         sg_set_buf(&sgout[0], aad, TLS_AAD_SPACE_SIZE);
1342
1343                         *chunk = 0;
1344                         err = tls_setup_from_iter(sk, out_iov, data_len,
1345                                                   &pages, chunk, &sgout[1],
1346                                                   (n_sgout - 1));
1347                         if (err < 0)
1348                                 goto fallback_to_reg_recv;
1349                 } else if (out_sg) {
1350                         memcpy(sgout, out_sg, n_sgout * sizeof(*sgout));
1351                 } else {
1352                         goto fallback_to_reg_recv;
1353                 }
1354         } else {
1355 fallback_to_reg_recv:
1356                 sgout = sgin;
1357                 pages = 0;
1358                 *chunk = 0;
1359                 *zc = false;
1360         }
1361
1362         /* Prepare and submit AEAD request */
1363         err = tls_do_decryption(sk, skb, sgin, sgout, iv,
1364                                 data_len, aead_req, *zc);
1365         if (err == -EINPROGRESS)
1366                 return err;
1367
1368         /* Release the pages in case iov was mapped to pages */
1369         for (; pages > 0; pages--)
1370                 put_page(sg_page(&sgout[pages]));
1371
1372         kfree(mem);
1373         return err;
1374 }
1375
1376 static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
1377                               struct iov_iter *dest, int *chunk, bool *zc)
1378 {
1379         struct tls_context *tls_ctx = tls_get_ctx(sk);
1380         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1381         struct strp_msg *rxm = strp_msg(skb);
1382         int err = 0;
1383
1384 #ifdef CONFIG_TLS_DEVICE
1385         err = tls_device_decrypted(sk, skb);
1386         if (err < 0)
1387                 return err;
1388 #endif
1389         if (!ctx->decrypted) {
1390                 err = decrypt_internal(sk, skb, dest, NULL, chunk, zc);
1391                 if (err < 0) {
1392                         if (err == -EINPROGRESS)
1393                                 tls_advance_record_sn(sk, &tls_ctx->rx);
1394
1395                         return err;
1396                 }
1397         } else {
1398                 *zc = false;
1399         }
1400
1401         rxm->offset += tls_ctx->rx.prepend_size;
1402         rxm->full_len -= tls_ctx->rx.overhead_size;
1403         tls_advance_record_sn(sk, &tls_ctx->rx);
1404         ctx->decrypted = true;
1405         ctx->saved_data_ready(sk);
1406
1407         return err;
1408 }
1409
1410 int decrypt_skb(struct sock *sk, struct sk_buff *skb,
1411                 struct scatterlist *sgout)
1412 {
1413         bool zc = true;
1414         int chunk;
1415
1416         return decrypt_internal(sk, skb, NULL, sgout, &chunk, &zc);
1417 }
1418
1419 static bool tls_sw_advance_skb(struct sock *sk, struct sk_buff *skb,
1420                                unsigned int len)
1421 {
1422         struct tls_context *tls_ctx = tls_get_ctx(sk);
1423         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1424
1425         if (skb) {
1426                 struct strp_msg *rxm = strp_msg(skb);
1427
1428                 if (len < rxm->full_len) {
1429                         rxm->offset += len;
1430                         rxm->full_len -= len;
1431                         return false;
1432                 }
1433                 kfree_skb(skb);
1434         }
1435
1436         /* Finished with message */
1437         ctx->recv_pkt = NULL;
1438         __strp_unpause(&ctx->strp);
1439
1440         return true;
1441 }
1442
1443 int tls_sw_recvmsg(struct sock *sk,
1444                    struct msghdr *msg,
1445                    size_t len,
1446                    int nonblock,
1447                    int flags,
1448                    int *addr_len)
1449 {
1450         struct tls_context *tls_ctx = tls_get_ctx(sk);
1451         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1452         struct sk_psock *psock;
1453         unsigned char control;
1454         struct strp_msg *rxm;
1455         struct sk_buff *skb;
1456         ssize_t copied = 0;
1457         bool cmsg = false;
1458         int target, err = 0;
1459         long timeo;
1460         bool is_kvec = iov_iter_is_kvec(&msg->msg_iter);
1461         int num_async = 0;
1462
1463         flags |= nonblock;
1464
1465         if (unlikely(flags & MSG_ERRQUEUE))
1466                 return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR);
1467
1468         psock = sk_psock_get(sk);
1469         lock_sock(sk);
1470
1471         target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
1472         timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1473         do {
1474                 bool zc = false;
1475                 bool async = false;
1476                 int chunk = 0;
1477
1478                 skb = tls_wait_data(sk, psock, flags, timeo, &err);
1479                 if (!skb) {
1480                         if (psock) {
1481                                 int ret = __tcp_bpf_recvmsg(sk, psock,
1482                                                             msg, len, flags);
1483
1484                                 if (ret > 0) {
1485                                         copied += ret;
1486                                         len -= ret;
1487                                         continue;
1488                                 }
1489                         }
1490                         goto recv_end;
1491                 }
1492
1493                 rxm = strp_msg(skb);
1494
1495                 if (!cmsg) {
1496                         int cerr;
1497
1498                         cerr = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE,
1499                                         sizeof(ctx->control), &ctx->control);
1500                         cmsg = true;
1501                         control = ctx->control;
1502                         if (ctx->control != TLS_RECORD_TYPE_DATA) {
1503                                 if (cerr || msg->msg_flags & MSG_CTRUNC) {
1504                                         err = -EIO;
1505                                         goto recv_end;
1506                                 }
1507                         }
1508                 } else if (control != ctx->control) {
1509                         goto recv_end;
1510                 }
1511
1512                 if (!ctx->decrypted) {
1513                         int to_copy = rxm->full_len - tls_ctx->rx.overhead_size;
1514
1515                         if (!is_kvec && to_copy <= len &&
1516                             likely(!(flags & MSG_PEEK)))
1517                                 zc = true;
1518
1519                         err = decrypt_skb_update(sk, skb, &msg->msg_iter,
1520                                                  &chunk, &zc);
1521                         if (err < 0 && err != -EINPROGRESS) {
1522                                 tls_err_abort(sk, EBADMSG);
1523                                 goto recv_end;
1524                         }
1525
1526                         if (err == -EINPROGRESS) {
1527                                 async = true;
1528                                 num_async++;
1529                                 goto pick_next_record;
1530                         }
1531
1532                         ctx->decrypted = true;
1533                 }
1534
1535                 if (!zc) {
1536                         chunk = min_t(unsigned int, rxm->full_len, len);
1537
1538                         err = skb_copy_datagram_msg(skb, rxm->offset, msg,
1539                                                     chunk);
1540                         if (err < 0)
1541                                 goto recv_end;
1542                 }
1543
1544 pick_next_record:
1545                 copied += chunk;
1546                 len -= chunk;
1547                 if (likely(!(flags & MSG_PEEK))) {
1548                         u8 control = ctx->control;
1549
1550                         /* For async, drop current skb reference */
1551                         if (async)
1552                                 skb = NULL;
1553
1554                         if (tls_sw_advance_skb(sk, skb, chunk)) {
1555                                 /* Return full control message to
1556                                  * userspace before trying to parse
1557                                  * another message type
1558                                  */
1559                                 msg->msg_flags |= MSG_EOR;
1560                                 if (control != TLS_RECORD_TYPE_DATA)
1561                                         goto recv_end;
1562                         } else {
1563                                 break;
1564                         }
1565                 } else {
1566                         /* MSG_PEEK right now cannot look beyond current skb
1567                          * from strparser, meaning we cannot advance skb here
1568                          * and thus unpause strparser since we'd loose original
1569                          * one.
1570                          */
1571                         break;
1572                 }
1573
1574                 /* If we have a new message from strparser, continue now. */
1575                 if (copied >= target && !ctx->recv_pkt)
1576                         break;
1577         } while (len);
1578
1579 recv_end:
1580         if (num_async) {
1581                 /* Wait for all previously submitted records to be decrypted */
1582                 smp_store_mb(ctx->async_notify, true);
1583                 if (atomic_read(&ctx->decrypt_pending)) {
1584                         err = crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
1585                         if (err) {
1586                                 /* one of async decrypt failed */
1587                                 tls_err_abort(sk, err);
1588                                 copied = 0;
1589                         }
1590                 } else {
1591                         reinit_completion(&ctx->async_wait.completion);
1592                 }
1593                 WRITE_ONCE(ctx->async_notify, false);
1594         }
1595
1596         release_sock(sk);
1597         if (psock)
1598                 sk_psock_put(sk, psock);
1599         return copied ? : err;
1600 }
1601
1602 ssize_t tls_sw_splice_read(struct socket *sock,  loff_t *ppos,
1603                            struct pipe_inode_info *pipe,
1604                            size_t len, unsigned int flags)
1605 {
1606         struct tls_context *tls_ctx = tls_get_ctx(sock->sk);
1607         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1608         struct strp_msg *rxm = NULL;
1609         struct sock *sk = sock->sk;
1610         struct sk_buff *skb;
1611         ssize_t copied = 0;
1612         int err = 0;
1613         long timeo;
1614         int chunk;
1615         bool zc = false;
1616
1617         lock_sock(sk);
1618
1619         timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1620
1621         skb = tls_wait_data(sk, NULL, flags, timeo, &err);
1622         if (!skb)
1623                 goto splice_read_end;
1624
1625         /* splice does not support reading control messages */
1626         if (ctx->control != TLS_RECORD_TYPE_DATA) {
1627                 err = -ENOTSUPP;
1628                 goto splice_read_end;
1629         }
1630
1631         if (!ctx->decrypted) {
1632                 err = decrypt_skb_update(sk, skb, NULL, &chunk, &zc);
1633
1634                 if (err < 0) {
1635                         tls_err_abort(sk, EBADMSG);
1636                         goto splice_read_end;
1637                 }
1638                 ctx->decrypted = true;
1639         }
1640         rxm = strp_msg(skb);
1641
1642         chunk = min_t(unsigned int, rxm->full_len, len);
1643         copied = skb_splice_bits(skb, sk, rxm->offset, pipe, chunk, flags);
1644         if (copied < 0)
1645                 goto splice_read_end;
1646
1647         if (likely(!(flags & MSG_PEEK)))
1648                 tls_sw_advance_skb(sk, skb, copied);
1649
1650 splice_read_end:
1651         release_sock(sk);
1652         return copied ? : err;
1653 }
1654
1655 bool tls_sw_stream_read(const struct sock *sk)
1656 {
1657         struct tls_context *tls_ctx = tls_get_ctx(sk);
1658         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1659         bool ingress_empty = true;
1660         struct sk_psock *psock;
1661
1662         rcu_read_lock();
1663         psock = sk_psock(sk);
1664         if (psock)
1665                 ingress_empty = list_empty(&psock->ingress_msg);
1666         rcu_read_unlock();
1667
1668         return !ingress_empty || ctx->recv_pkt;
1669 }
1670
1671 static int tls_read_size(struct strparser *strp, struct sk_buff *skb)
1672 {
1673         struct tls_context *tls_ctx = tls_get_ctx(strp->sk);
1674         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1675         char header[TLS_HEADER_SIZE + MAX_IV_SIZE];
1676         struct strp_msg *rxm = strp_msg(skb);
1677         size_t cipher_overhead;
1678         size_t data_len = 0;
1679         int ret;
1680
1681         /* Verify that we have a full TLS header, or wait for more data */
1682         if (rxm->offset + tls_ctx->rx.prepend_size > skb->len)
1683                 return 0;
1684
1685         /* Sanity-check size of on-stack buffer. */
1686         if (WARN_ON(tls_ctx->rx.prepend_size > sizeof(header))) {
1687                 ret = -EINVAL;
1688                 goto read_failure;
1689         }
1690
1691         /* Linearize header to local buffer */
1692         ret = skb_copy_bits(skb, rxm->offset, header, tls_ctx->rx.prepend_size);
1693
1694         if (ret < 0)
1695                 goto read_failure;
1696
1697         ctx->control = header[0];
1698
1699         data_len = ((header[4] & 0xFF) | (header[3] << 8));
1700
1701         cipher_overhead = tls_ctx->rx.tag_size + tls_ctx->rx.iv_size;
1702
1703         if (data_len > TLS_MAX_PAYLOAD_SIZE + cipher_overhead) {
1704                 ret = -EMSGSIZE;
1705                 goto read_failure;
1706         }
1707         if (data_len < cipher_overhead) {
1708                 ret = -EBADMSG;
1709                 goto read_failure;
1710         }
1711
1712         if (header[1] != TLS_VERSION_MINOR(tls_ctx->crypto_recv.info.version) ||
1713             header[2] != TLS_VERSION_MAJOR(tls_ctx->crypto_recv.info.version)) {
1714                 ret = -EINVAL;
1715                 goto read_failure;
1716         }
1717
1718 #ifdef CONFIG_TLS_DEVICE
1719         handle_device_resync(strp->sk, TCP_SKB_CB(skb)->seq + rxm->offset,
1720                              *(u64*)tls_ctx->rx.rec_seq);
1721 #endif
1722         return data_len + TLS_HEADER_SIZE;
1723
1724 read_failure:
1725         tls_err_abort(strp->sk, ret);
1726
1727         return ret;
1728 }
1729
1730 static void tls_queue(struct strparser *strp, struct sk_buff *skb)
1731 {
1732         struct tls_context *tls_ctx = tls_get_ctx(strp->sk);
1733         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1734
1735         ctx->decrypted = false;
1736
1737         ctx->recv_pkt = skb;
1738         strp_pause(strp);
1739
1740         ctx->saved_data_ready(strp->sk);
1741 }
1742
1743 static void tls_data_ready(struct sock *sk)
1744 {
1745         struct tls_context *tls_ctx = tls_get_ctx(sk);
1746         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1747         struct sk_psock *psock;
1748
1749         strp_data_ready(&ctx->strp);
1750
1751         psock = sk_psock_get(sk);
1752         if (psock && !list_empty(&psock->ingress_msg)) {
1753                 ctx->saved_data_ready(sk);
1754                 sk_psock_put(sk, psock);
1755         }
1756 }
1757
1758 void tls_sw_free_resources_tx(struct sock *sk)
1759 {
1760         struct tls_context *tls_ctx = tls_get_ctx(sk);
1761         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
1762         struct tls_rec *rec, *tmp;
1763
1764         /* Wait for any pending async encryptions to complete */
1765         smp_store_mb(ctx->async_notify, true);
1766         if (atomic_read(&ctx->encrypt_pending))
1767                 crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
1768
1769         cancel_delayed_work_sync(&ctx->tx_work.work);
1770
1771         /* Tx whatever records we can transmit and abandon the rest */
1772         tls_tx_records(sk, -1);
1773
1774         /* Free up un-sent records in tx_list. First, free
1775          * the partially sent record if any at head of tx_list.
1776          */
1777         if (tls_ctx->partially_sent_record) {
1778                 struct scatterlist *sg = tls_ctx->partially_sent_record;
1779
1780                 while (1) {
1781                         put_page(sg_page(sg));
1782                         sk_mem_uncharge(sk, sg->length);
1783
1784                         if (sg_is_last(sg))
1785                                 break;
1786                         sg++;
1787                 }
1788
1789                 tls_ctx->partially_sent_record = NULL;
1790
1791                 rec = list_first_entry(&ctx->tx_list,
1792                                        struct tls_rec, list);
1793                 list_del(&rec->list);
1794                 sk_msg_free(sk, &rec->msg_plaintext);
1795                 kfree(rec);
1796         }
1797
1798         list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) {
1799                 list_del(&rec->list);
1800                 sk_msg_free(sk, &rec->msg_encrypted);
1801                 sk_msg_free(sk, &rec->msg_plaintext);
1802                 kfree(rec);
1803         }
1804
1805         crypto_free_aead(ctx->aead_send);
1806         tls_free_open_rec(sk);
1807
1808         kfree(ctx);
1809 }
1810
1811 void tls_sw_release_resources_rx(struct sock *sk)
1812 {
1813         struct tls_context *tls_ctx = tls_get_ctx(sk);
1814         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1815
1816         if (ctx->aead_recv) {
1817                 kfree_skb(ctx->recv_pkt);
1818                 ctx->recv_pkt = NULL;
1819                 crypto_free_aead(ctx->aead_recv);
1820                 strp_stop(&ctx->strp);
1821                 write_lock_bh(&sk->sk_callback_lock);
1822                 sk->sk_data_ready = ctx->saved_data_ready;
1823                 write_unlock_bh(&sk->sk_callback_lock);
1824                 release_sock(sk);
1825                 strp_done(&ctx->strp);
1826                 lock_sock(sk);
1827         }
1828 }
1829
1830 void tls_sw_free_resources_rx(struct sock *sk)
1831 {
1832         struct tls_context *tls_ctx = tls_get_ctx(sk);
1833         struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
1834
1835         tls_sw_release_resources_rx(sk);
1836
1837         kfree(ctx);
1838 }
1839
1840 /* The work handler to transmitt the encrypted records in tx_list */
1841 static void tx_work_handler(struct work_struct *work)
1842 {
1843         struct delayed_work *delayed_work = to_delayed_work(work);
1844         struct tx_work *tx_work = container_of(delayed_work,
1845                                                struct tx_work, work);
1846         struct sock *sk = tx_work->sk;
1847         struct tls_context *tls_ctx = tls_get_ctx(sk);
1848         struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
1849
1850         if (!test_and_clear_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask))
1851                 return;
1852
1853         lock_sock(sk);
1854         tls_tx_records(sk, -1);
1855         release_sock(sk);
1856 }
1857
1858 int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
1859 {
1860         struct tls_crypto_info *crypto_info;
1861         struct tls12_crypto_info_aes_gcm_128 *gcm_128_info;
1862         struct tls_sw_context_tx *sw_ctx_tx = NULL;
1863         struct tls_sw_context_rx *sw_ctx_rx = NULL;
1864         struct cipher_context *cctx;
1865         struct crypto_aead **aead;
1866         struct strp_callbacks cb;
1867         u16 nonce_size, tag_size, iv_size, rec_seq_size;
1868         char *iv, *rec_seq;
1869         int rc = 0;
1870
1871         if (!ctx) {
1872                 rc = -EINVAL;
1873                 goto out;
1874         }
1875
1876         if (tx) {
1877                 if (!ctx->priv_ctx_tx) {
1878                         sw_ctx_tx = kzalloc(sizeof(*sw_ctx_tx), GFP_KERNEL);
1879                         if (!sw_ctx_tx) {
1880                                 rc = -ENOMEM;
1881                                 goto out;
1882                         }
1883                         ctx->priv_ctx_tx = sw_ctx_tx;
1884                 } else {
1885                         sw_ctx_tx =
1886                                 (struct tls_sw_context_tx *)ctx->priv_ctx_tx;
1887                 }
1888         } else {
1889                 if (!ctx->priv_ctx_rx) {
1890                         sw_ctx_rx = kzalloc(sizeof(*sw_ctx_rx), GFP_KERNEL);
1891                         if (!sw_ctx_rx) {
1892                                 rc = -ENOMEM;
1893                                 goto out;
1894                         }
1895                         ctx->priv_ctx_rx = sw_ctx_rx;
1896                 } else {
1897                         sw_ctx_rx =
1898                                 (struct tls_sw_context_rx *)ctx->priv_ctx_rx;
1899                 }
1900         }
1901
1902         if (tx) {
1903                 crypto_init_wait(&sw_ctx_tx->async_wait);
1904                 crypto_info = &ctx->crypto_send.info;
1905                 cctx = &ctx->tx;
1906                 aead = &sw_ctx_tx->aead_send;
1907                 INIT_LIST_HEAD(&sw_ctx_tx->tx_list);
1908                 INIT_DELAYED_WORK(&sw_ctx_tx->tx_work.work, tx_work_handler);
1909                 sw_ctx_tx->tx_work.sk = sk;
1910         } else {
1911                 crypto_init_wait(&sw_ctx_rx->async_wait);
1912                 crypto_info = &ctx->crypto_recv.info;
1913                 cctx = &ctx->rx;
1914                 aead = &sw_ctx_rx->aead_recv;
1915         }
1916
1917         switch (crypto_info->cipher_type) {
1918         case TLS_CIPHER_AES_GCM_128: {
1919                 nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
1920                 tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE;
1921                 iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
1922                 iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv;
1923                 rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE;
1924                 rec_seq =
1925                  ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq;
1926                 gcm_128_info =
1927                         (struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
1928                 break;
1929         }
1930         default:
1931                 rc = -EINVAL;
1932                 goto free_priv;
1933         }
1934
1935         /* Sanity-check the IV size for stack allocations. */
1936         if (iv_size > MAX_IV_SIZE || nonce_size > MAX_IV_SIZE) {
1937                 rc = -EINVAL;
1938                 goto free_priv;
1939         }
1940
1941         cctx->prepend_size = TLS_HEADER_SIZE + nonce_size;
1942         cctx->tag_size = tag_size;
1943         cctx->overhead_size = cctx->prepend_size + cctx->tag_size;
1944         cctx->iv_size = iv_size;
1945         cctx->iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
1946                            GFP_KERNEL);
1947         if (!cctx->iv) {
1948                 rc = -ENOMEM;
1949                 goto free_priv;
1950         }
1951         memcpy(cctx->iv, gcm_128_info->salt, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
1952         memcpy(cctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size);
1953         cctx->rec_seq_size = rec_seq_size;
1954         cctx->rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL);
1955         if (!cctx->rec_seq) {
1956                 rc = -ENOMEM;
1957                 goto free_iv;
1958         }
1959
1960         if (!*aead) {
1961                 *aead = crypto_alloc_aead("gcm(aes)", 0, 0);
1962                 if (IS_ERR(*aead)) {
1963                         rc = PTR_ERR(*aead);
1964                         *aead = NULL;
1965                         goto free_rec_seq;
1966                 }
1967         }
1968
1969         ctx->push_pending_record = tls_sw_push_pending_record;
1970
1971         rc = crypto_aead_setkey(*aead, gcm_128_info->key,
1972                                 TLS_CIPHER_AES_GCM_128_KEY_SIZE);
1973         if (rc)
1974                 goto free_aead;
1975
1976         rc = crypto_aead_setauthsize(*aead, cctx->tag_size);
1977         if (rc)
1978                 goto free_aead;
1979
1980         if (sw_ctx_rx) {
1981                 /* Set up strparser */
1982                 memset(&cb, 0, sizeof(cb));
1983                 cb.rcv_msg = tls_queue;
1984                 cb.parse_msg = tls_read_size;
1985
1986                 strp_init(&sw_ctx_rx->strp, sk, &cb);
1987
1988                 write_lock_bh(&sk->sk_callback_lock);
1989                 sw_ctx_rx->saved_data_ready = sk->sk_data_ready;
1990                 sk->sk_data_ready = tls_data_ready;
1991                 write_unlock_bh(&sk->sk_callback_lock);
1992
1993                 strp_check_rcv(&sw_ctx_rx->strp);
1994         }
1995
1996         goto out;
1997
1998 free_aead:
1999         crypto_free_aead(*aead);
2000         *aead = NULL;
2001 free_rec_seq:
2002         kfree(cctx->rec_seq);
2003         cctx->rec_seq = NULL;
2004 free_iv:
2005         kfree(cctx->iv);
2006         cctx->iv = NULL;
2007 free_priv:
2008         if (tx) {
2009                 kfree(ctx->priv_ctx_tx);
2010                 ctx->priv_ctx_tx = NULL;
2011         } else {
2012                 kfree(ctx->priv_ctx_rx);
2013                 ctx->priv_ctx_rx = NULL;
2014         }
2015 out:
2016         return rc;
2017 }