net/xfrm/xfrm_algo.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * xfrm algorithm interface
   4  *
   5  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
   6  */
   7
   8 #include <crypto/hash.h>
   9 #include <crypto/skcipher.h>
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/pfkeyv2.h>
  13 #include <linux/crypto.h>
  14 #include <linux/scatterlist.h>
  15 #include <net/xfrm.h>
  16 #if IS_ENABLED(CONFIG_INET_ESP) || IS_ENABLED(CONFIG_INET6_ESP)
  17 #include <net/esp.h>
  18 #endif
  19
  20 /*
  21  * Algorithms supported by IPsec.  These entries contain properties which
  22  * are used in key negotiation and xfrm processing, and are used to verify
  23  * that instantiated crypto transforms have correct parameters for IPsec
  24  * purposes.
  25  */
  26 static struct xfrm_algo_desc aead_list[] = {
  27 {
  28         .name = "rfc4106(gcm(aes))",
  29
  30         .uinfo = {
  31                 .aead = {
  32                         .geniv = "seqiv",
  33                         .icv_truncbits = 64,
  34                 }
  35         },
  36
  37         .pfkey_supported = 1,
  38
  39         .desc = {
  40                 .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV8,
  41                 .sadb_alg_ivlen = 8,
  42                 .sadb_alg_minbits = 128,
  43                 .sadb_alg_maxbits = 256
  44         }
  45 },
  46 {
  47         .name = "rfc4106(gcm(aes))",
  48
  49         .uinfo = {
  50                 .aead = {
  51                         .geniv = "seqiv",
  52                         .icv_truncbits = 96,
  53                 }
  54         },
  55
  56         .pfkey_supported = 1,
  57
  58         .desc = {
  59                 .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV12,
  60                 .sadb_alg_ivlen = 8,
  61                 .sadb_alg_minbits = 128,
  62                 .sadb_alg_maxbits = 256
  63         }
  64 },
  65 {
  66         .name = "rfc4106(gcm(aes))",
  67
  68         .uinfo = {
  69                 .aead = {
  70                         .geniv = "seqiv",
  71                         .icv_truncbits = 128,
  72                 }
  73         },
  74
  75         .pfkey_supported = 1,
  76
  77         .desc = {
  78                 .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV16,
  79                 .sadb_alg_ivlen = 8,
  80                 .sadb_alg_minbits = 128,
  81                 .sadb_alg_maxbits = 256
  82         }
  83 },
  84 {
  85         .name = "rfc4309(ccm(aes))",
  86
  87         .uinfo = {
  88                 .aead = {
  89                         .geniv = "seqiv",
  90                         .icv_truncbits = 64,
  91                 }
  92         },
  93
  94         .pfkey_supported = 1,
  95
  96         .desc = {
  97                 .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV8,
  98                 .sadb_alg_ivlen = 8,
  99                 .sadb_alg_minbits = 128,
 100                 .sadb_alg_maxbits = 256
 101         }
 102 },
 103 {
 104         .name = "rfc4309(ccm(aes))",
 105
 106         .uinfo = {
 107                 .aead = {
 108                         .geniv = "seqiv",
 109                         .icv_truncbits = 96,
 110                 }
 111         },
 112
 113         .pfkey_supported = 1,
 114
 115         .desc = {
 116                 .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV12,
 117                 .sadb_alg_ivlen = 8,
 118                 .sadb_alg_minbits = 128,
 119                 .sadb_alg_maxbits = 256
 120         }
 121 },
 122 {
 123         .name = "rfc4309(ccm(aes))",
 124
 125         .uinfo = {
 126                 .aead = {
 127                         .geniv = "seqiv",
 128                         .icv_truncbits = 128,
 129                 }
 130         },
 131
 132         .pfkey_supported = 1,
 133
 134         .desc = {
 135                 .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV16,
 136                 .sadb_alg_ivlen = 8,
 137                 .sadb_alg_minbits = 128,
 138                 .sadb_alg_maxbits = 256
 139         }
 140 },
 141 {
 142         .name = "rfc4543(gcm(aes))",
 143
 144         .uinfo = {
 145                 .aead = {
 146                         .geniv = "seqiv",
 147                         .icv_truncbits = 128,
 148                 }
 149         },
 150
 151         .pfkey_supported = 1,
 152
 153         .desc = {
 154                 .sadb_alg_id = SADB_X_EALG_NULL_AES_GMAC,
 155                 .sadb_alg_ivlen = 8,
 156                 .sadb_alg_minbits = 128,
 157                 .sadb_alg_maxbits = 256
 158         }
 159 },
 160 {
 161         .name = "rfc7539esp(chacha20,poly1305)",
 162
 163         .uinfo = {
 164                 .aead = {
 165                         .geniv = "seqiv",
 166                         .icv_truncbits = 128,
 167                 }
 168         },
 169
 170         .pfkey_supported = 0,
 171 },
 172 };
 173
 174 static struct xfrm_algo_desc aalg_list[] = {
 175 {
 176         .name = "digest_null",
 177
 178         .uinfo = {
 179                 .auth = {
 180                         .icv_truncbits = 0,
 181                         .icv_fullbits = 0,
 182                 }
 183         },
 184
 185         .pfkey_supported = 1,
 186
 187         .desc = {
 188                 .sadb_alg_id = SADB_X_AALG_NULL,
 189                 .sadb_alg_ivlen = 0,
 190                 .sadb_alg_minbits = 0,
 191                 .sadb_alg_maxbits = 0
 192         }
 193 },
 194 {
 195         .name = "hmac(md5)",
 196         .compat = "md5",
 197
 198         .uinfo = {
 199                 .auth = {
 200                         .icv_truncbits = 96,
 201                         .icv_fullbits = 128,
 202                 }
 203         },
 204
 205         .pfkey_supported = 1,
 206
 207         .desc = {
 208                 .sadb_alg_id = SADB_AALG_MD5HMAC,
 209                 .sadb_alg_ivlen = 0,
 210                 .sadb_alg_minbits = 128,
 211                 .sadb_alg_maxbits = 128
 212         }
 213 },
 214 {
 215         .name = "hmac(sha1)",
 216         .compat = "sha1",
 217
 218         .uinfo = {
 219                 .auth = {
 220                         .icv_truncbits = 96,
 221                         .icv_fullbits = 160,
 222                 }
 223         },
 224
 225         .pfkey_supported = 1,
 226
 227         .desc = {
 228                 .sadb_alg_id = SADB_AALG_SHA1HMAC,
 229                 .sadb_alg_ivlen = 0,
 230                 .sadb_alg_minbits = 160,
 231                 .sadb_alg_maxbits = 160
 232         }
 233 },
 234 {
 235         .name = "hmac(sha256)",
 236         .compat = "sha256",
 237
 238         .uinfo = {
 239                 .auth = {
 240                         .icv_truncbits = 96,
 241                         .icv_fullbits = 256,
 242                 }
 243         },
 244
 245         .pfkey_supported = 1,
 246
 247         .desc = {
 248                 .sadb_alg_id = SADB_X_AALG_SHA2_256HMAC,
 249                 .sadb_alg_ivlen = 0,
 250                 .sadb_alg_minbits = 256,
 251                 .sadb_alg_maxbits = 256
 252         }
 253 },
 254 {
 255         .name = "hmac(sha384)",
 256
 257         .uinfo = {
 258                 .auth = {
 259                         .icv_truncbits = 192,
 260                         .icv_fullbits = 384,
 261                 }
 262         },
 263
 264         .pfkey_supported = 1,
 265
 266         .desc = {
 267                 .sadb_alg_id = SADB_X_AALG_SHA2_384HMAC,
 268                 .sadb_alg_ivlen = 0,
 269                 .sadb_alg_minbits = 384,
 270                 .sadb_alg_maxbits = 384
 271         }
 272 },
 273 {
 274         .name = "hmac(sha512)",
 275
 276         .uinfo = {
 277                 .auth = {
 278                         .icv_truncbits = 256,
 279                         .icv_fullbits = 512,
 280                 }
 281         },
 282
 283         .pfkey_supported = 1,
 284
 285         .desc = {
 286                 .sadb_alg_id = SADB_X_AALG_SHA2_512HMAC,
 287                 .sadb_alg_ivlen = 0,
 288                 .sadb_alg_minbits = 512,
 289                 .sadb_alg_maxbits = 512
 290         }
 291 },
 292 {
 293         .name = "hmac(rmd160)",
 294         .compat = "rmd160",
 295
 296         .uinfo = {
 297                 .auth = {
 298                         .icv_truncbits = 96,
 299                         .icv_fullbits = 160,
 300                 }
 301         },
 302
 303         .pfkey_supported = 1,
 304
 305         .desc = {
 306                 .sadb_alg_id = SADB_X_AALG_RIPEMD160HMAC,
 307                 .sadb_alg_ivlen = 0,
 308                 .sadb_alg_minbits = 160,
 309                 .sadb_alg_maxbits = 160
 310         }
 311 },
 312 {
 313         .name = "xcbc(aes)",
 314
 315         .uinfo = {
 316                 .auth = {
 317                         .icv_truncbits = 96,
 318                         .icv_fullbits = 128,
 319                 }
 320         },
 321
 322         .pfkey_supported = 1,
 323
 324         .desc = {
 325                 .sadb_alg_id = SADB_X_AALG_AES_XCBC_MAC,
 326                 .sadb_alg_ivlen = 0,
 327                 .sadb_alg_minbits = 128,
 328                 .sadb_alg_maxbits = 128
 329         }
 330 },
 331 {
 332         /* rfc4494 */
 333         .name = "cmac(aes)",
 334
 335         .uinfo = {
 336                 .auth = {
 337                         .icv_truncbits = 96,
 338                         .icv_fullbits = 128,
 339                 }
 340         },
 341
 342         .pfkey_supported = 0,
 343 },
 344 };
 345
 346 static struct xfrm_algo_desc ealg_list[] = {
 347 {
 348         .name = "ecb(cipher_null)",
 349         .compat = "cipher_null",
 350
 351         .uinfo = {
 352                 .encr = {
 353                         .blockbits = 8,
 354                         .defkeybits = 0,
 355                 }
 356         },
 357
 358         .pfkey_supported = 1,
 359
 360         .desc = {
 361                 .sadb_alg_id =  SADB_EALG_NULL,
 362                 .sadb_alg_ivlen = 0,
 363                 .sadb_alg_minbits = 0,
 364                 .sadb_alg_maxbits = 0
 365         }
 366 },
 367 {
 368         .name = "cbc(des)",
 369         .compat = "des",
 370
 371         .uinfo = {
 372                 .encr = {
 373                         .geniv = "echainiv",
 374                         .blockbits = 64,
 375                         .defkeybits = 64,
 376                 }
 377         },
 378
 379         .pfkey_supported = 1,
 380
 381         .desc = {
 382                 .sadb_alg_id = SADB_EALG_DESCBC,
 383                 .sadb_alg_ivlen = 8,
 384                 .sadb_alg_minbits = 64,
 385                 .sadb_alg_maxbits = 64
 386         }
 387 },
 388 {
 389         .name = "cbc(des3_ede)",
 390         .compat = "des3_ede",
 391
 392         .uinfo = {
 393                 .encr = {
 394                         .geniv = "echainiv",
 395                         .blockbits = 64,
 396                         .defkeybits = 192,
 397                 }
 398         },
 399
 400         .pfkey_supported = 1,
 401
 402         .desc = {
 403                 .sadb_alg_id = SADB_EALG_3DESCBC,
 404                 .sadb_alg_ivlen = 8,
 405                 .sadb_alg_minbits = 192,
 406                 .sadb_alg_maxbits = 192
 407         }
 408 },
 409 {
 410         .name = "cbc(cast5)",
 411         .compat = "cast5",
 412
 413         .uinfo = {
 414                 .encr = {
 415                         .geniv = "echainiv",
 416                         .blockbits = 64,
 417                         .defkeybits = 128,
 418                 }
 419         },
 420
 421         .pfkey_supported = 1,
 422
 423         .desc = {
 424                 .sadb_alg_id = SADB_X_EALG_CASTCBC,
 425                 .sadb_alg_ivlen = 8,
 426                 .sadb_alg_minbits = 40,
 427                 .sadb_alg_maxbits = 128
 428         }
 429 },
 430 {
 431         .name = "cbc(blowfish)",
 432         .compat = "blowfish",
 433
 434         .uinfo = {
 435                 .encr = {
 436                         .geniv = "echainiv",
 437                         .blockbits = 64,
 438                         .defkeybits = 128,
 439                 }
 440         },
 441
 442         .pfkey_supported = 1,
 443
 444         .desc = {
 445                 .sadb_alg_id = SADB_X_EALG_BLOWFISHCBC,
 446                 .sadb_alg_ivlen = 8,
 447                 .sadb_alg_minbits = 40,
 448                 .sadb_alg_maxbits = 448
 449         }
 450 },
 451 {
 452         .name = "cbc(aes)",
 453         .compat = "aes",
 454
 455         .uinfo = {
 456                 .encr = {
 457                         .geniv = "echainiv",
 458                         .blockbits = 128,
 459                         .defkeybits = 128,
 460                 }
 461         },
 462
 463         .pfkey_supported = 1,
 464
 465         .desc = {
 466                 .sadb_alg_id = SADB_X_EALG_AESCBC,
 467                 .sadb_alg_ivlen = 8,
 468                 .sadb_alg_minbits = 128,
 469                 .sadb_alg_maxbits = 256
 470         }
 471 },
 472 {
 473         .name = "cbc(serpent)",
 474         .compat = "serpent",
 475
 476         .uinfo = {
 477                 .encr = {
 478                         .geniv = "echainiv",
 479                         .blockbits = 128,
 480                         .defkeybits = 128,
 481                 }
 482         },
 483
 484         .pfkey_supported = 1,
 485
 486         .desc = {
 487                 .sadb_alg_id = SADB_X_EALG_SERPENTCBC,
 488                 .sadb_alg_ivlen = 8,
 489                 .sadb_alg_minbits = 128,
 490                 .sadb_alg_maxbits = 256,
 491         }
 492 },
 493 {
 494         .name = "cbc(camellia)",
 495         .compat = "camellia",
 496
 497         .uinfo = {
 498                 .encr = {
 499                         .geniv = "echainiv",
 500                         .blockbits = 128,
 501                         .defkeybits = 128,
 502                 }
 503         },
 504
 505         .pfkey_supported = 1,
 506
 507         .desc = {
 508                 .sadb_alg_id = SADB_X_EALG_CAMELLIACBC,
 509                 .sadb_alg_ivlen = 8,
 510                 .sadb_alg_minbits = 128,
 511                 .sadb_alg_maxbits = 256
 512         }
 513 },
 514 {
 515         .name = "cbc(twofish)",
 516         .compat = "twofish",
 517
 518         .uinfo = {
 519                 .encr = {
 520                         .geniv = "echainiv",
 521                         .blockbits = 128,
 522                         .defkeybits = 128,
 523                 }
 524         },
 525
 526         .pfkey_supported = 1,
 527
 528         .desc = {
 529                 .sadb_alg_id = SADB_X_EALG_TWOFISHCBC,
 530                 .sadb_alg_ivlen = 8,
 531                 .sadb_alg_minbits = 128,
 532                 .sadb_alg_maxbits = 256
 533         }
 534 },
 535 {
 536         .name = "rfc3686(ctr(aes))",
 537
 538         .uinfo = {
 539                 .encr = {
 540                         .geniv = "seqiv",
 541                         .blockbits = 128,
 542                         .defkeybits = 160, /* 128-bit key + 32-bit nonce */
 543                 }
 544         },
 545
 546         .pfkey_supported = 1,
 547
 548         .desc = {
 549                 .sadb_alg_id = SADB_X_EALG_AESCTR,
 550                 .sadb_alg_ivlen = 8,
 551                 .sadb_alg_minbits = 160,
 552                 .sadb_alg_maxbits = 288
 553         }
 554 },
 555 };
 556
 557 static struct xfrm_algo_desc calg_list[] = {
 558 {
 559         .name = "deflate",
 560         .uinfo = {
 561                 .comp = {
 562                         .threshold = 90,
 563                 }
 564         },
 565         .pfkey_supported = 1,
 566         .desc = { .sadb_alg_id = SADB_X_CALG_DEFLATE }
 567 },
 568 {
 569         .name = "lzs",
 570         .uinfo = {
 571                 .comp = {
 572                         .threshold = 90,
 573                 }
 574         },
 575         .pfkey_supported = 1,
 576         .desc = { .sadb_alg_id = SADB_X_CALG_LZS }
 577 },
 578 {
 579         .name = "lzjh",
 580         .uinfo = {
 581                 .comp = {
 582                         .threshold = 50,
 583                 }
 584         },
 585         .pfkey_supported = 1,
 586         .desc = { .sadb_alg_id = SADB_X_CALG_LZJH }
 587 },
 588 };
 589
 590 static inline int aalg_entries(void)
 591 {
 592         return ARRAY_SIZE(aalg_list);
 593 }
 594
 595 static inline int ealg_entries(void)
 596 {
 597         return ARRAY_SIZE(ealg_list);
 598 }
 599
 600 static inline int calg_entries(void)
 601 {
 602         return ARRAY_SIZE(calg_list);
 603 }
 604
 605 struct xfrm_algo_list {
 606         struct xfrm_algo_desc *algs;
 607         int entries;
 608         u32 type;
 609         u32 mask;
 610 };
 611
 612 static const struct xfrm_algo_list xfrm_aead_list = {
 613         .algs = aead_list,
 614         .entries = ARRAY_SIZE(aead_list),
 615         .type = CRYPTO_ALG_TYPE_AEAD,
 616         .mask = CRYPTO_ALG_TYPE_MASK,
 617 };
 618
 619 static const struct xfrm_algo_list xfrm_aalg_list = {
 620         .algs = aalg_list,
 621         .entries = ARRAY_SIZE(aalg_list),
 622         .type = CRYPTO_ALG_TYPE_HASH,
 623         .mask = CRYPTO_ALG_TYPE_HASH_MASK,
 624 };
 625
 626 static const struct xfrm_algo_list xfrm_ealg_list = {
 627         .algs = ealg_list,
 628         .entries = ARRAY_SIZE(ealg_list),
 629         .type = CRYPTO_ALG_TYPE_SKCIPHER,
 630         .mask = CRYPTO_ALG_TYPE_MASK,
 631 };
 632
 633 static const struct xfrm_algo_list xfrm_calg_list = {
 634         .algs = calg_list,
 635         .entries = ARRAY_SIZE(calg_list),
 636         .type = CRYPTO_ALG_TYPE_COMPRESS,
 637         .mask = CRYPTO_ALG_TYPE_MASK,
 638 };
 639
 640 static struct xfrm_algo_desc *xfrm_find_algo(
 641         const struct xfrm_algo_list *algo_list,
 642         int match(const struct xfrm_algo_desc *entry, const void *data),
 643         const void *data, int probe)
 644 {
 645         struct xfrm_algo_desc *list = algo_list->algs;
 646         int i, status;
 647
 648         for (i = 0; i < algo_list->entries; i++) {
 649                 if (!match(list + i, data))
 650                         continue;
 651
 652                 if (list[i].available)
 653                         return &list[i];
 654
 655                 if (!probe)
 656                         break;
 657
 658                 status = crypto_has_alg(list[i].name, algo_list->type,
 659                                         algo_list->mask);
 660                 if (!status)
 661                         break;
 662
 663                 list[i].available = status;
 664                 return &list[i];
 665         }
 666         return NULL;
 667 }
 668
 669 static int xfrm_alg_id_match(const struct xfrm_algo_desc *entry,
 670                              const void *data)
 671 {
 672         return entry->desc.sadb_alg_id == (unsigned long)data;
 673 }
 674
 675 struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id)
 676 {
 677         return xfrm_find_algo(&xfrm_aalg_list, xfrm_alg_id_match,
 678                               (void *)(unsigned long)alg_id, 1);
 679 }
 680 EXPORT_SYMBOL_GPL(xfrm_aalg_get_byid);
 681
 682 struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id)
 683 {
 684         return xfrm_find_algo(&xfrm_ealg_list, xfrm_alg_id_match,
 685                               (void *)(unsigned long)alg_id, 1);
 686 }
 687 EXPORT_SYMBOL_GPL(xfrm_ealg_get_byid);
 688
 689 struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id)
 690 {
 691         return xfrm_find_algo(&xfrm_calg_list, xfrm_alg_id_match,
 692                               (void *)(unsigned long)alg_id, 1);
 693 }
 694 EXPORT_SYMBOL_GPL(xfrm_calg_get_byid);
 695
 696 static int xfrm_alg_name_match(const struct xfrm_algo_desc *entry,
 697                                const void *data)
 698 {
 699         const char *name = data;
 700
 701         return name && (!strcmp(name, entry->name) ||
 702                         (entry->compat && !strcmp(name, entry->compat)));
 703 }
 704
 705 struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe)
 706 {
 707         return xfrm_find_algo(&xfrm_aalg_list, xfrm_alg_name_match, name,
 708                               probe);
 709 }
 710 EXPORT_SYMBOL_GPL(xfrm_aalg_get_byname);
 711
 712 struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe)
 713 {
 714         return xfrm_find_algo(&xfrm_ealg_list, xfrm_alg_name_match, name,
 715                               probe);
 716 }
 717 EXPORT_SYMBOL_GPL(xfrm_ealg_get_byname);
 718
 719 struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe)
 720 {
 721         return xfrm_find_algo(&xfrm_calg_list, xfrm_alg_name_match, name,
 722                               probe);
 723 }
 724 EXPORT_SYMBOL_GPL(xfrm_calg_get_byname);
 725
 726 struct xfrm_aead_name {
 727         const char *name;
 728         int icvbits;
 729 };
 730
 731 static int xfrm_aead_name_match(const struct xfrm_algo_desc *entry,
 732                                 const void *data)
 733 {
 734         const struct xfrm_aead_name *aead = data;
 735         const char *name = aead->name;
 736
 737         return aead->icvbits == entry->uinfo.aead.icv_truncbits && name &&
 738                !strcmp(name, entry->name);
 739 }
 740
 741 struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, int probe)
 742 {
 743         struct xfrm_aead_name data = {
 744                 .name = name,
 745                 .icvbits = icv_len,
 746         };
 747
 748         return xfrm_find_algo(&xfrm_aead_list, xfrm_aead_name_match, &data,
 749                               probe);
 750 }
 751 EXPORT_SYMBOL_GPL(xfrm_aead_get_byname);
 752
 753 struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx)
 754 {
 755         if (idx >= aalg_entries())
 756                 return NULL;
 757
 758         return &aalg_list[idx];
 759 }
 760 EXPORT_SYMBOL_GPL(xfrm_aalg_get_byidx);
 761
 762 struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx)
 763 {
 764         if (idx >= ealg_entries())
 765                 return NULL;
 766
 767         return &ealg_list[idx];
 768 }
 769 EXPORT_SYMBOL_GPL(xfrm_ealg_get_byidx);
 770
 771 /*
 772  * Probe for the availability of crypto algorithms, and set the available
 773  * flag for any algorithms found on the system.  This is typically called by
 774  * pfkey during userspace SA add, update or register.
 775  */
 776 void xfrm_probe_algs(void)
 777 {
 778         int i, status;
 779
 780         BUG_ON(in_softirq());
 781
 782         for (i = 0; i < aalg_entries(); i++) {
 783                 status = crypto_has_ahash(aalg_list[i].name, 0, 0);
 784                 if (aalg_list[i].available != status)
 785                         aalg_list[i].available = status;
 786         }
 787
 788         for (i = 0; i < ealg_entries(); i++) {
 789                 status = crypto_has_skcipher(ealg_list[i].name, 0, 0);
 790                 if (ealg_list[i].available != status)
 791                         ealg_list[i].available = status;
 792         }
 793
 794         for (i = 0; i < calg_entries(); i++) {
 795                 status = crypto_has_comp(calg_list[i].name, 0,
 796                                          CRYPTO_ALG_ASYNC);
 797                 if (calg_list[i].available != status)
 798                         calg_list[i].available = status;
 799         }
 800 }
 801 EXPORT_SYMBOL_GPL(xfrm_probe_algs);
 802
 803 int xfrm_count_pfkey_auth_supported(void)
 804 {
 805         int i, n;
 806
 807         for (i = 0, n = 0; i < aalg_entries(); i++)
 808                 if (aalg_list[i].available && aalg_list[i].pfkey_supported)
 809                         n++;
 810         return n;
 811 }
 812 EXPORT_SYMBOL_GPL(xfrm_count_pfkey_auth_supported);
 813
 814 int xfrm_count_pfkey_enc_supported(void)
 815 {
 816         int i, n;
 817
 818         for (i = 0, n = 0; i < ealg_entries(); i++)
 819                 if (ealg_list[i].available && ealg_list[i].pfkey_supported)
 820                         n++;
 821         return n;
 822 }
 823 EXPORT_SYMBOL_GPL(xfrm_count_pfkey_enc_supported);
 824
 825 MODULE_LICENSE("GPL");