src/plugins/crypto_ipsecmb/ipsecmb.c

   1 /*
   2  * ipsecmb.c - Intel IPSec Multi-buffer library Crypto Engine
   3  *
   4  * Copyright (c) 2019 Cisco Systemss
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <fcntl.h>
  19
  20 #include <intel-ipsec-mb.h>
  21
  22 #include <vnet/vnet.h>
  23 #include <vnet/plugin/plugin.h>
  24 #include <vpp/app/version.h>
  25 #include <vnet/crypto/crypto.h>
  26 #include <vppinfra/cpu.h>
  27
  28 #define HMAC_MAX_BLOCK_SIZE SHA_512_BLOCK_SIZE
  29 #define EXPANDED_KEY_N_BYTES (16 * 15)
  30
  31 typedef struct
  32 {
  33   MB_MGR *mgr;
  34   __m128i cbc_iv;
  35 } ipsecmb_per_thread_data_t;
  36
  37 typedef struct
  38 {
  39   u16 data_size;
  40   u8 block_size;
  41   aes_gcm_pre_t aes_gcm_pre;
  42   keyexp_t keyexp;
  43   hash_one_block_t hash_one_block;
  44   hash_fn_t hash_fn;
  45 } ipsecmb_alg_data_t;
  46
  47 typedef struct ipsecmb_main_t_
  48 {
  49   ipsecmb_per_thread_data_t *per_thread_data;
  50   ipsecmb_alg_data_t alg_data[VNET_CRYPTO_N_ALGS];
  51   void **key_data;
  52 } ipsecmb_main_t;
  53
  54 typedef struct
  55 {
  56   u8 enc_key_exp[EXPANDED_KEY_N_BYTES];
  57   u8 dec_key_exp[EXPANDED_KEY_N_BYTES];
  58 } ipsecmb_aes_cbc_key_data_t;
  59
  60 static ipsecmb_main_t ipsecmb_main = { };
  61
  62 /*
  63  * (Alg, JOB_HASH_ALG, fn, block-size-bytes, hash-size-bytes, digest-size-bytes)
  64  */
  65 #define foreach_ipsecmb_hmac_op                                \
  66   _(SHA1,   SHA1,    sha1,   64,  20, 20)                      \
  67   _(SHA224, SHA_224, sha224, 64,  32, 28)                      \
  68   _(SHA256, SHA_256, sha256, 64,  32, 32)                      \
  69   _(SHA384, SHA_384, sha384, 128, 64, 48)                      \
  70   _(SHA512, SHA_512, sha512, 128, 64, 64)
  71
  72 /*
  73  * (Alg, key-len-bits)
  74  */
  75 #define foreach_ipsecmb_cbc_cipher_op                          \
  76   _(AES_128_CBC, 128)                                          \
  77   _(AES_192_CBC, 192)                                          \
  78   _(AES_256_CBC, 256)
  79
  80 /*
  81  * (Alg, key-len-bytes, iv-len-bytes)
  82  */
  83 #define foreach_ipsecmb_gcm_cipher_op                          \
  84   _(AES_128_GCM, 128)                                          \
  85   _(AES_192_GCM, 192)                                          \
  86   _(AES_256_GCM, 256)
  87
  88 always_inline void
  89 ipsecmb_retire_hmac_job (JOB_AES_HMAC * job, u32 * n_fail, u32 digest_size)
  90 {
  91   vnet_crypto_op_t *op = job->user_data;
  92   u32 len = op->digest_len ? op->digest_len : digest_size;
  93
  94   if (STS_COMPLETED != job->status)
  95     {
  96       op->status = VNET_CRYPTO_OP_STATUS_FAIL_BAD_HMAC;
  97       *n_fail = *n_fail + 1;
  98       return;
  99     }
 100
 101   if (op->flags & VNET_CRYPTO_OP_FLAG_HMAC_CHECK)
 102     {
 103       if ((memcmp (op->digest, job->auth_tag_output, len)))
 104         {
 105           *n_fail = *n_fail + 1;
 106           op->status = VNET_CRYPTO_OP_STATUS_FAIL_BAD_HMAC;
 107           return;
 108         }
 109     }
 110   else if (len == digest_size)
 111     clib_memcpy_fast (op->digest, job->auth_tag_output, digest_size);
 112   else
 113     clib_memcpy_fast (op->digest, job->auth_tag_output, len);
 114
 115   op->status = VNET_CRYPTO_OP_STATUS_COMPLETED;
 116 }
 117
 118 static_always_inline u32
 119 ipsecmb_ops_hmac_inline (vlib_main_t * vm, vnet_crypto_op_t * ops[],
 120                          u32 n_ops, u32 block_size, u32 hash_size,
 121                          u32 digest_size, JOB_HASH_ALG alg)
 122 {
 123   ipsecmb_main_t *imbm = &ipsecmb_main;
 124   ipsecmb_per_thread_data_t *ptd = vec_elt_at_index (imbm->per_thread_data,
 125                                                      vm->thread_index);
 126   JOB_AES_HMAC *job;
 127   u32 i, n_fail = 0;
 128   u8 scratch[n_ops][digest_size];
 129
 130   /*
 131    * queue all the jobs first ...
 132    */
 133   for (i = 0; i < n_ops; i++)
 134     {
 135       vnet_crypto_op_t *op = ops[i];
 136       u8 *kd = (u8 *) imbm->key_data[op->key_index];
 137
 138       job = IMB_GET_NEXT_JOB (ptd->mgr);
 139
 140       job->src = op->src;
 141       job->hash_start_src_offset_in_bytes = 0;
 142       job->msg_len_to_hash_in_bytes = op->len;
 143       job->hash_alg = alg;
 144       job->auth_tag_output_len_in_bytes = digest_size;
 145       job->auth_tag_output = scratch[i];
 146
 147       job->cipher_mode = NULL_CIPHER;
 148       job->cipher_direction = DECRYPT;
 149       job->chain_order = HASH_CIPHER;
 150
 151       job->u.HMAC._hashed_auth_key_xor_ipad = kd;
 152       job->u.HMAC._hashed_auth_key_xor_opad = kd + hash_size;
 153       job->user_data = op;
 154
 155       job = IMB_SUBMIT_JOB (ptd->mgr);
 156
 157       if (job)
 158         ipsecmb_retire_hmac_job (job, &n_fail, digest_size);
 159     }
 160
 161   while ((job = IMB_FLUSH_JOB (ptd->mgr)))
 162     ipsecmb_retire_hmac_job (job, &n_fail, digest_size);
 163
 164   return n_ops - n_fail;
 165 }
 166
 167 #define _(a, b, c, d, e, f)                                             \
 168 static_always_inline u32                                                \
 169 ipsecmb_ops_hmac_##a (vlib_main_t * vm,                                 \
 170                       vnet_crypto_op_t * ops[],                         \
 171                       u32 n_ops)                                        \
 172 { return ipsecmb_ops_hmac_inline (vm, ops, n_ops, d, e, f, b); }        \
 173
 174 foreach_ipsecmb_hmac_op;
 175 #undef _
 176
 177 always_inline void
 178 ipsecmb_retire_cipher_job (JOB_AES_HMAC * job, u32 * n_fail)
 179 {
 180   vnet_crypto_op_t *op = job->user_data;
 181
 182   if (STS_COMPLETED != job->status)
 183     {
 184       op->status = VNET_CRYPTO_OP_STATUS_FAIL_BAD_HMAC;
 185       *n_fail = *n_fail + 1;
 186     }
 187   else
 188     op->status = VNET_CRYPTO_OP_STATUS_COMPLETED;
 189 }
 190
 191 static_always_inline u32
 192 ipsecmb_ops_cbc_cipher_inline (vlib_main_t * vm, vnet_crypto_op_t * ops[],
 193                                u32 n_ops, u32 key_len,
 194                                JOB_CIPHER_DIRECTION direction)
 195 {
 196   ipsecmb_main_t *imbm = &ipsecmb_main;
 197   ipsecmb_per_thread_data_t *ptd = vec_elt_at_index (imbm->per_thread_data,
 198                                                      vm->thread_index);
 199   JOB_AES_HMAC *job;
 200   u32 i, n_fail = 0;
 201
 202   for (i = 0; i < n_ops; i++)
 203     {
 204       ipsecmb_aes_cbc_key_data_t *kd;
 205       vnet_crypto_op_t *op = ops[i];
 206       kd = (ipsecmb_aes_cbc_key_data_t *) imbm->key_data[op->key_index];
 207       __m128i iv;
 208
 209       job = IMB_GET_NEXT_JOB (ptd->mgr);
 210
 211       job->src = op->src;
 212       job->dst = op->dst;
 213       job->msg_len_to_cipher_in_bytes = op->len;
 214       job->cipher_start_src_offset_in_bytes = 0;
 215
 216       job->hash_alg = NULL_HASH;
 217       job->cipher_mode = CBC;
 218       job->cipher_direction = direction;
 219       job->chain_order = (direction == ENCRYPT ? CIPHER_HASH : HASH_CIPHER);
 220
 221       if ((direction == ENCRYPT) && (op->flags & VNET_CRYPTO_OP_FLAG_INIT_IV))
 222         {
 223           iv = ptd->cbc_iv;
 224           _mm_storeu_si128 ((__m128i *) op->iv, iv);
 225           ptd->cbc_iv = _mm_aesenc_si128 (iv, iv);
 226         }
 227
 228       job->aes_key_len_in_bytes = key_len / 8;
 229       job->aes_enc_key_expanded = kd->enc_key_exp;
 230       job->aes_dec_key_expanded = kd->dec_key_exp;
 231       job->iv = op->iv;
 232       job->iv_len_in_bytes = AES_BLOCK_SIZE;
 233
 234       job->user_data = op;
 235
 236       job = IMB_SUBMIT_JOB (ptd->mgr);
 237
 238       if (job)
 239         ipsecmb_retire_cipher_job (job, &n_fail);
 240     }
 241
 242   while ((job = IMB_FLUSH_JOB (ptd->mgr)))
 243     ipsecmb_retire_cipher_job (job, &n_fail);
 244
 245   return n_ops - n_fail;
 246 }
 247
 248 #define _(a, b)                                                              \
 249 static_always_inline u32                                                     \
 250 ipsecmb_ops_cbc_cipher_enc_##a (vlib_main_t * vm,                            \
 251                                 vnet_crypto_op_t * ops[],                    \
 252                                 u32 n_ops)                                   \
 253 { return ipsecmb_ops_cbc_cipher_inline (vm, ops, n_ops, b, ENCRYPT); }       \
 254                                                                              \
 255 static_always_inline u32                                                     \
 256 ipsecmb_ops_cbc_cipher_dec_##a (vlib_main_t * vm,                            \
 257                                 vnet_crypto_op_t * ops[],                    \
 258                                 u32 n_ops)                                   \
 259 { return ipsecmb_ops_cbc_cipher_inline (vm, ops, n_ops, b, DECRYPT); }       \
 260
 261 foreach_ipsecmb_cbc_cipher_op;
 262 #undef _
 263
 264 #define _(a, b)                                                              \
 265 static_always_inline u32                                                     \
 266 ipsecmb_ops_gcm_cipher_enc_##a (vlib_main_t * vm, vnet_crypto_op_t * ops[],  \
 267                                 u32 n_ops)                                   \
 268 {                                                                            \
 269   ipsecmb_main_t *imbm = &ipsecmb_main;                                      \
 270   ipsecmb_per_thread_data_t *ptd = vec_elt_at_index (imbm->per_thread_data,  \
 271                                                      vm->thread_index);      \
 272   MB_MGR *m = ptd->mgr;                                                      \
 273   u32 i;                                                                     \
 274                                                                              \
 275   for (i = 0; i < n_ops; i++)                                                \
 276     {                                                                        \
 277       struct gcm_key_data *kd;                                               \
 278       struct gcm_context_data ctx;                                           \
 279       vnet_crypto_op_t *op = ops[i];                                         \
 280                                                                              \
 281       kd = (struct gcm_key_data *) imbm->key_data[op->key_index];            \
 282       IMB_AES##b##_GCM_ENC (m, kd, &ctx, op->dst, op->src, op->len, op->iv,  \
 283                             op->aad, op->aad_len, op->tag, op->tag_len);     \
 284                                                                              \
 285       op->status = VNET_CRYPTO_OP_STATUS_COMPLETED;                          \
 286     }                                                                        \
 287                                                                              \
 288   return n_ops;                                                              \
 289 }                                                                            \
 290                                                                              \
 291 static_always_inline u32                                                     \
 292 ipsecmb_ops_gcm_cipher_dec_##a (vlib_main_t * vm, vnet_crypto_op_t * ops[],  \
 293                                  u32 n_ops)                                  \
 294 {                                                                            \
 295   ipsecmb_main_t *imbm = &ipsecmb_main;                                      \
 296   ipsecmb_per_thread_data_t *ptd = vec_elt_at_index (imbm->per_thread_data,  \
 297                                                      vm->thread_index);      \
 298   MB_MGR *m = ptd->mgr;                                                      \
 299   u32 i, n_failed = 0;                                                       \
 300                                                                              \
 301   for (i = 0; i < n_ops; i++)                                                \
 302     {                                                                        \
 303       struct gcm_key_data *kd;                                               \
 304       struct gcm_context_data ctx;                                           \
 305       vnet_crypto_op_t *op = ops[i];                                         \
 306       u8 scratch[64];                                                        \
 307                                                                              \
 308       kd = (struct gcm_key_data *) imbm->key_data[op->key_index];            \
 309       IMB_AES##b##_GCM_DEC (m, kd, &ctx, op->dst, op->src, op->len, op->iv,  \
 310                             op->aad, op->aad_len, scratch, op->tag_len);     \
 311                                                                              \
 312       if ((memcmp (op->tag, scratch, op->tag_len)))                          \
 313         {                                                                    \
 314           op->status = VNET_CRYPTO_OP_STATUS_FAIL_BAD_HMAC;                  \
 315           n_failed++;                                                        \
 316         }                                                                    \
 317       else                                                                   \
 318         op->status = VNET_CRYPTO_OP_STATUS_COMPLETED;                        \
 319     }                                                                        \
 320                                                                              \
 321   return n_ops - n_failed;                                                   \
 322 }
 323
 324 foreach_ipsecmb_gcm_cipher_op;
 325 #undef _
 326
 327 clib_error_t *
 328 crypto_ipsecmb_iv_init (ipsecmb_main_t * imbm)
 329 {
 330   ipsecmb_per_thread_data_t *ptd;
 331   clib_error_t *err = 0;
 332   int fd;
 333
 334   if ((fd = open ("/dev/urandom", O_RDONLY)) < 0)
 335     return clib_error_return_unix (0, "failed to open '/dev/urandom'");
 336
 337   vec_foreach (ptd, imbm->per_thread_data)
 338   {
 339     if (read (fd, &ptd->cbc_iv, sizeof (ptd->cbc_iv)) != sizeof (ptd->cbc_iv))
 340       {
 341         err = clib_error_return_unix (0, "'/dev/urandom' read failure");
 342         close (fd);
 343         return (err);
 344       }
 345   }
 346
 347   close (fd);
 348   return (NULL);
 349 }
 350
 351 static void
 352 crypto_ipsecmb_key_handler (vlib_main_t * vm, vnet_crypto_key_op_t kop,
 353                             vnet_crypto_key_index_t idx)
 354 {
 355   ipsecmb_main_t *imbm = &ipsecmb_main;
 356   vnet_crypto_key_t *key = vnet_crypto_get_key (idx);
 357   ipsecmb_alg_data_t *ad = imbm->alg_data + key->alg;
 358   u32 i;
 359   void *kd;
 360
 361   if (kop == VNET_CRYPTO_KEY_OP_DEL)
 362     {
 363       if (idx >= vec_len (imbm->key_data))
 364         return;
 365
 366       if (imbm->key_data[idx] == 0)
 367         return;
 368
 369       clib_mem_free_s (imbm->key_data[idx]);
 370       imbm->key_data[idx] = 0;
 371       return;
 372     }
 373
 374   if (ad->data_size == 0)
 375     return;
 376
 377   vec_validate_aligned (imbm->key_data, idx, CLIB_CACHE_LINE_BYTES);
 378
 379   if (kop == VNET_CRYPTO_KEY_OP_MODIFY && imbm->key_data[idx])
 380     {
 381       clib_mem_free_s (imbm->key_data[idx]);
 382     }
 383
 384   kd = imbm->key_data[idx] = clib_mem_alloc_aligned (ad->data_size,
 385                                                      CLIB_CACHE_LINE_BYTES);
 386
 387   /* AES CBC key expansion */
 388   if (ad->keyexp)
 389     {
 390       ad->keyexp (key->data, ((ipsecmb_aes_cbc_key_data_t *) kd)->enc_key_exp,
 391                   ((ipsecmb_aes_cbc_key_data_t *) kd)->dec_key_exp);
 392       return;
 393     }
 394
 395   /* AES GCM */
 396   if (ad->aes_gcm_pre)
 397     {
 398       ad->aes_gcm_pre (key->data, (struct gcm_key_data *) kd);
 399       return;
 400     }
 401
 402   /* HMAC */
 403   if (ad->hash_one_block)
 404     {
 405       const int block_qw = HMAC_MAX_BLOCK_SIZE / sizeof (u64);
 406       u64 pad[block_qw], key_hash[block_qw];
 407
 408       clib_memset_u8 (key_hash, 0, HMAC_MAX_BLOCK_SIZE);
 409       if (vec_len (key->data) <= ad->block_size)
 410         clib_memcpy_fast (key_hash, key->data, vec_len (key->data));
 411       else
 412         ad->hash_fn (key->data, vec_len (key->data), key_hash);
 413
 414       for (i = 0; i < block_qw; i++)
 415         pad[i] = key_hash[i] ^ 0x3636363636363636;
 416       ad->hash_one_block (pad, kd);
 417
 418       for (i = 0; i < block_qw; i++)
 419         pad[i] = key_hash[i] ^ 0x5c5c5c5c5c5c5c5c;
 420       ad->hash_one_block (pad, ((u8 *) kd) + (ad->data_size / 2));
 421
 422       return;
 423     }
 424 }
 425
 426 static clib_error_t *
 427 crypto_ipsecmb_init (vlib_main_t * vm)
 428 {
 429   ipsecmb_main_t *imbm = &ipsecmb_main;
 430   ipsecmb_alg_data_t *ad;
 431   ipsecmb_per_thread_data_t *ptd;
 432   vlib_thread_main_t *tm = vlib_get_thread_main ();
 433   clib_error_t *error;
 434   MB_MGR *m = 0;
 435   u32 eidx;
 436   u8 *name;
 437
 438   if (!clib_cpu_supports_aes ())
 439     return 0;
 440
 441   /*
 442    * A priority that is better than OpenSSL but worse than VPP natvie
 443    */
 444   name = format (0, "Intel(R) Multi-Buffer Crypto for IPsec Library %s%c",
 445                  IMB_VERSION_STR, 0);
 446   eidx = vnet_crypto_register_engine (vm, "ipsecmb", 80, (char *) name);
 447
 448   vec_validate (imbm->per_thread_data, tm->n_vlib_mains - 1);
 449
 450   /* *INDENT-OFF* */
 451   vec_foreach (ptd, imbm->per_thread_data)
 452     {
 453         ptd->mgr = alloc_mb_mgr (0);
 454         if (clib_cpu_supports_avx512f ())
 455           init_mb_mgr_avx512 (ptd->mgr);
 456         else if (clib_cpu_supports_avx2 ())
 457           init_mb_mgr_avx2 (ptd->mgr);
 458         else
 459           init_mb_mgr_sse (ptd->mgr);
 460
 461         if (ptd == imbm->per_thread_data)
 462           m = ptd->mgr;
 463     }
 464   /* *INDENT-ON* */
 465
 466   if (clib_cpu_supports_x86_aes () && (error = crypto_ipsecmb_iv_init (imbm)))
 467     return (error);
 468
 469 #define _(a, b, c, d, e, f)                                              \
 470   vnet_crypto_register_ops_handler (vm, eidx, VNET_CRYPTO_OP_##a##_HMAC, \
 471                                     ipsecmb_ops_hmac_##a);               \
 472   ad = imbm->alg_data + VNET_CRYPTO_ALG_HMAC_##a;                        \
 473   ad->block_size = d;                                                    \
 474   ad->data_size = e * 2;                                                 \
 475   ad->hash_one_block = m-> c##_one_block;                                \
 476   ad->hash_fn = m-> c;                                                   \
 477
 478   foreach_ipsecmb_hmac_op;
 479 #undef _
 480 #define _(a, b)                                                         \
 481   vnet_crypto_register_ops_handler (vm, eidx, VNET_CRYPTO_OP_##a##_ENC, \
 482                                     ipsecmb_ops_cbc_cipher_enc_##a);    \
 483   vnet_crypto_register_ops_handler (vm, eidx, VNET_CRYPTO_OP_##a##_DEC, \
 484                                     ipsecmb_ops_cbc_cipher_dec_##a);    \
 485   ad = imbm->alg_data + VNET_CRYPTO_ALG_##a;                            \
 486   ad->data_size = sizeof (ipsecmb_aes_cbc_key_data_t);                  \
 487   ad->keyexp = m->keyexp_##b;                                           \
 488
 489   foreach_ipsecmb_cbc_cipher_op;
 490 #undef _
 491 #define _(a, b)                                                         \
 492   vnet_crypto_register_ops_handler (vm, eidx, VNET_CRYPTO_OP_##a##_ENC, \
 493                                     ipsecmb_ops_gcm_cipher_enc_##a);    \
 494   vnet_crypto_register_ops_handler (vm, eidx, VNET_CRYPTO_OP_##a##_DEC, \
 495                                     ipsecmb_ops_gcm_cipher_dec_##a);    \
 496   ad = imbm->alg_data + VNET_CRYPTO_ALG_##a;                            \
 497   ad->data_size = sizeof (struct gcm_key_data);                         \
 498   ad->aes_gcm_pre = m->gcm##b##_pre;                                    \
 499
 500   foreach_ipsecmb_gcm_cipher_op;
 501 #undef _
 502
 503   vnet_crypto_register_key_handler (vm, eidx, crypto_ipsecmb_key_handler);
 504   return (NULL);
 505 }
 506
 507 /* *INDENT-OFF* */
 508 VLIB_INIT_FUNCTION (crypto_ipsecmb_init) =
 509 {
 510   .runs_after = VLIB_INITS ("vnet_crypto_init"),
 511 };
 512 /* *INDENT-ON* */
 513
 514 /* *INDENT-OFF* */
 515 VLIB_PLUGIN_REGISTER () =
 516 {
 517   .version = VPP_BUILD_VER,
 518   .description = "Intel IPSEC Multi-buffer Crypto Engine",
 519 };
 520 /* *INDENT-ON* */
 521
 522 /*
 523  * fd.io coding-style-patch-verification: ON
 524  *
 525  * Local Variables:
 526  * eval: (c-set-style "gnu")
 527  * End:
 528  */