src/vnet/ipsec/ipsec.c

   1 /*
   2  * ipsec.c : IPSEC module functions
   3  *
   4  * Copyright (c) 2015 Cisco and/or its affiliates.
   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 <vnet/vnet.h>
  19 #include <vnet/api_errno.h>
  20 #include <vnet/ip/ip.h>
  21 #include <vnet/interface.h>
  22 #include <vnet/udp/udp.h>
  23
  24 #include <vnet/ipsec/ipsec.h>
  25 #include <vnet/ipsec/esp.h>
  26 #include <vnet/ipsec/ah.h>
  27
  28 ipsec_main_t ipsec_main;
  29
  30 static clib_error_t *
  31 ipsec_check_ah_support (ipsec_sa_t * sa)
  32 {
  33   ipsec_main_t *im = &ipsec_main;
  34
  35   if (sa->integ_alg == IPSEC_INTEG_ALG_NONE)
  36     return clib_error_return (0, "unsupported none integ-alg");
  37
  38   if (!vnet_crypto_is_set_handler (im->integ_algs[sa->integ_alg].alg))
  39     return clib_error_return (0, "No crypto engine support for %U",
  40                               format_ipsec_integ_alg, sa->integ_alg);
  41
  42   return 0;
  43 }
  44
  45 static clib_error_t *
  46 ipsec_check_esp_support (ipsec_sa_t * sa)
  47 {
  48   ipsec_main_t *im = &ipsec_main;
  49
  50   if (IPSEC_INTEG_ALG_NONE != sa->integ_alg)
  51     {
  52       if (!vnet_crypto_is_set_handler (im->integ_algs[sa->integ_alg].alg))
  53         return clib_error_return (0, "No crypto engine support for %U",
  54                                   format_ipsec_integ_alg, sa->integ_alg);
  55     }
  56   if (IPSEC_CRYPTO_ALG_NONE != sa->crypto_alg)
  57     {
  58       if (!vnet_crypto_is_set_handler (im->crypto_algs[sa->crypto_alg].alg))
  59         return clib_error_return (0, "No crypto engine support for %U",
  60                                   format_ipsec_crypto_alg, sa->crypto_alg);
  61     }
  62
  63   return (0);
  64 }
  65
  66 clib_error_t *
  67 ipsec_add_del_sa_sess_cb (ipsec_main_t * im, u32 sa_index, u8 is_add)
  68 {
  69   ipsec_ah_backend_t *ah =
  70     pool_elt_at_index (im->ah_backends, im->ah_current_backend);
  71   if (ah->add_del_sa_sess_cb)
  72     {
  73       clib_error_t *err = ah->add_del_sa_sess_cb (sa_index, is_add);
  74       if (err)
  75         return err;
  76     }
  77   ipsec_esp_backend_t *esp =
  78     pool_elt_at_index (im->esp_backends, im->esp_current_backend);
  79   if (esp->add_del_sa_sess_cb)
  80     {
  81       clib_error_t *err = esp->add_del_sa_sess_cb (sa_index, is_add);
  82       if (err)
  83         return err;
  84     }
  85   return 0;
  86 }
  87
  88 clib_error_t *
  89 ipsec_check_support_cb (ipsec_main_t * im, ipsec_sa_t * sa)
  90 {
  91   clib_error_t *error = 0;
  92
  93   if (PREDICT_FALSE (sa->protocol == IPSEC_PROTOCOL_AH))
  94     {
  95       ipsec_ah_backend_t *ah =
  96         pool_elt_at_index (im->ah_backends, im->ah_current_backend);
  97       ASSERT (ah->check_support_cb);
  98       error = ah->check_support_cb (sa);
  99     }
 100   else
 101     {
 102       ipsec_esp_backend_t *esp =
 103         pool_elt_at_index (im->esp_backends, im->esp_current_backend);
 104       ASSERT (esp->check_support_cb);
 105       error = esp->check_support_cb (sa);
 106     }
 107   return error;
 108 }
 109
 110
 111 static void
 112 ipsec_add_node (vlib_main_t * vm, const char *node_name,
 113                 const char *prev_node_name, u32 * out_node_index,
 114                 u32 * out_next_index)
 115 {
 116   vlib_node_t *prev_node, *node;
 117   prev_node = vlib_get_node_by_name (vm, (u8 *) prev_node_name);
 118   ASSERT (prev_node);
 119   node = vlib_get_node_by_name (vm, (u8 *) node_name);
 120   ASSERT (node);
 121   *out_node_index = node->index;
 122   *out_next_index = vlib_node_add_next (vm, prev_node->index, node->index);
 123 }
 124
 125 void
 126 ipsec_add_feature (const char *arc_name,
 127                    const char *node_name, u32 * out_feature_index)
 128 {
 129   u8 arc;
 130
 131   arc = vnet_get_feature_arc_index (arc_name);
 132   ASSERT (arc != (u8) ~ 0);
 133   *out_feature_index = vnet_get_feature_index (arc, node_name);
 134 }
 135
 136 u32
 137 ipsec_register_ah_backend (vlib_main_t * vm, ipsec_main_t * im,
 138                            const char *name,
 139                            const char *ah4_encrypt_node_name,
 140                            const char *ah4_decrypt_node_name,
 141                            const char *ah6_encrypt_node_name,
 142                            const char *ah6_decrypt_node_name,
 143                            check_support_cb_t ah_check_support_cb,
 144                            add_del_sa_sess_cb_t ah_add_del_sa_sess_cb)
 145 {
 146   ipsec_ah_backend_t *b;
 147   pool_get (im->ah_backends, b);
 148   b->name = format (0, "%s%c", name, 0);
 149
 150   ipsec_add_node (vm, ah4_encrypt_node_name, "ipsec4-output-feature",
 151                   &b->ah4_encrypt_node_index, &b->ah4_encrypt_next_index);
 152   ipsec_add_node (vm, ah4_decrypt_node_name, "ipsec4-input-feature",
 153                   &b->ah4_decrypt_node_index, &b->ah4_decrypt_next_index);
 154   ipsec_add_node (vm, ah6_encrypt_node_name, "ipsec6-output-feature",
 155                   &b->ah6_encrypt_node_index, &b->ah6_encrypt_next_index);
 156   ipsec_add_node (vm, ah6_decrypt_node_name, "ipsec6-input-feature",
 157                   &b->ah6_decrypt_node_index, &b->ah6_decrypt_next_index);
 158
 159   b->check_support_cb = ah_check_support_cb;
 160   b->add_del_sa_sess_cb = ah_add_del_sa_sess_cb;
 161   return b - im->ah_backends;
 162 }
 163
 164 u32
 165 ipsec_register_esp_backend (vlib_main_t * vm, ipsec_main_t * im,
 166                             const char *name,
 167                             const char *esp4_encrypt_node_name,
 168                             const char *esp4_encrypt_node_tun_name,
 169                             const char *esp4_decrypt_node_name,
 170                             const char *esp6_encrypt_node_name,
 171                             const char *esp6_encrypt_node_tun_name,
 172                             const char *esp6_decrypt_node_name,
 173                             check_support_cb_t esp_check_support_cb,
 174                             add_del_sa_sess_cb_t esp_add_del_sa_sess_cb)
 175 {
 176   ipsec_esp_backend_t *b;
 177
 178   pool_get (im->esp_backends, b);
 179   b->name = format (0, "%s%c", name, 0);
 180
 181   ipsec_add_node (vm, esp4_encrypt_node_name, "ipsec4-output-feature",
 182                   &b->esp4_encrypt_node_index, &b->esp4_encrypt_next_index);
 183   ipsec_add_node (vm, esp4_decrypt_node_name, "ipsec4-input-feature",
 184                   &b->esp4_decrypt_node_index, &b->esp4_decrypt_next_index);
 185   ipsec_add_node (vm, esp6_encrypt_node_name, "ipsec6-output-feature",
 186                   &b->esp6_encrypt_node_index, &b->esp6_encrypt_next_index);
 187   ipsec_add_node (vm, esp6_decrypt_node_name, "ipsec6-input-feature",
 188                   &b->esp6_decrypt_node_index, &b->esp6_decrypt_next_index);
 189
 190   ipsec_add_feature ("ip4-output", esp4_encrypt_node_tun_name,
 191                      &b->esp4_encrypt_tun_feature_index);
 192   ipsec_add_feature ("ip6-output", esp6_encrypt_node_tun_name,
 193                      &b->esp6_encrypt_tun_feature_index);
 194
 195   b->check_support_cb = esp_check_support_cb;
 196   b->add_del_sa_sess_cb = esp_add_del_sa_sess_cb;
 197   return b - im->esp_backends;
 198 }
 199
 200 clib_error_t *
 201 ipsec_rsc_in_use (ipsec_main_t * im)
 202 {
 203   /* return an error is crypto resource are in use */
 204   if (pool_elts (im->sad) > 0)
 205     return clib_error_return (0,
 206                               "%d SA entries configured",
 207                               pool_elts (im->sad));
 208
 209   if (pool_elts (im->tunnel_interfaces))
 210     return clib_error_return (0,
 211                               "%d tunnel-interface entries configured",
 212                               pool_elts (im->tunnel_interfaces));
 213
 214   return (NULL);
 215 }
 216
 217 int
 218 ipsec_select_ah_backend (ipsec_main_t * im, u32 backend_idx)
 219 {
 220   if (ipsec_rsc_in_use (im))
 221     return VNET_API_ERROR_RSRC_IN_USE;
 222
 223   if (pool_is_free_index (im->ah_backends, backend_idx))
 224     return VNET_API_ERROR_INVALID_VALUE;
 225
 226   ipsec_ah_backend_t *b = pool_elt_at_index (im->ah_backends, backend_idx);
 227   im->ah_current_backend = backend_idx;
 228   im->ah4_encrypt_node_index = b->ah4_encrypt_node_index;
 229   im->ah4_decrypt_node_index = b->ah4_decrypt_node_index;
 230   im->ah4_encrypt_next_index = b->ah4_encrypt_next_index;
 231   im->ah4_decrypt_next_index = b->ah4_decrypt_next_index;
 232   im->ah6_encrypt_node_index = b->ah6_encrypt_node_index;
 233   im->ah6_decrypt_node_index = b->ah6_decrypt_node_index;
 234   im->ah6_encrypt_next_index = b->ah6_encrypt_next_index;
 235   im->ah6_decrypt_next_index = b->ah6_decrypt_next_index;
 236
 237   return 0;
 238 }
 239
 240 int
 241 ipsec_select_esp_backend (ipsec_main_t * im, u32 backend_idx)
 242 {
 243   if (ipsec_rsc_in_use (im))
 244     return VNET_API_ERROR_RSRC_IN_USE;
 245
 246   if (pool_is_free_index (im->esp_backends, backend_idx))
 247     return VNET_API_ERROR_INVALID_VALUE;
 248
 249   ipsec_esp_backend_t *b = pool_elt_at_index (im->esp_backends, backend_idx);
 250   im->esp_current_backend = backend_idx;
 251   im->esp4_encrypt_node_index = b->esp4_encrypt_node_index;
 252   im->esp4_decrypt_node_index = b->esp4_decrypt_node_index;
 253   im->esp4_encrypt_next_index = b->esp4_encrypt_next_index;
 254   im->esp4_decrypt_next_index = b->esp4_decrypt_next_index;
 255   im->esp6_encrypt_node_index = b->esp6_encrypt_node_index;
 256   im->esp6_decrypt_node_index = b->esp6_decrypt_node_index;
 257   im->esp6_encrypt_next_index = b->esp6_encrypt_next_index;
 258   im->esp6_decrypt_next_index = b->esp6_decrypt_next_index;
 259
 260   im->esp4_encrypt_tun_feature_index = b->esp4_encrypt_tun_feature_index;
 261   im->esp6_encrypt_tun_feature_index = b->esp6_encrypt_tun_feature_index;
 262
 263   return 0;
 264 }
 265
 266 static clib_error_t *
 267 ipsec_init (vlib_main_t * vm)
 268 {
 269   clib_error_t *error;
 270   ipsec_main_t *im = &ipsec_main;
 271   ipsec_main_crypto_alg_t *a;
 272
 273   /* Backend registration requires the feature arcs to be set up */
 274   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
 275     return (error);
 276
 277   im->vnet_main = vnet_get_main ();
 278   im->vlib_main = vm;
 279
 280   im->spd_index_by_spd_id = hash_create (0, sizeof (uword));
 281   im->sa_index_by_sa_id = hash_create (0, sizeof (uword));
 282   im->spd_index_by_sw_if_index = hash_create (0, sizeof (uword));
 283
 284   vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
 285   ASSERT (node);
 286   im->error_drop_node_index = node->index;
 287
 288   u32 idx = ipsec_register_ah_backend (vm, im, "crypto engine backend",
 289                                        "ah4-encrypt",
 290                                        "ah4-decrypt",
 291                                        "ah6-encrypt",
 292                                        "ah6-decrypt",
 293                                        ipsec_check_ah_support,
 294                                        NULL);
 295
 296   im->ah_default_backend = idx;
 297   int rv = ipsec_select_ah_backend (im, idx);
 298   ASSERT (0 == rv);
 299   (void) (rv);                  // avoid warning
 300
 301   idx = ipsec_register_esp_backend (vm, im, "crypto engine backend",
 302                                     "esp4-encrypt",
 303                                     "esp4-encrypt-tun",
 304                                     "esp4-decrypt",
 305                                     "esp6-encrypt",
 306                                     "esp6-encrypt-tun",
 307                                     "esp6-decrypt",
 308                                     ipsec_check_esp_support, NULL);
 309   im->esp_default_backend = idx;
 310
 311   rv = ipsec_select_esp_backend (im, idx);
 312   ASSERT (0 == rv);
 313   (void) (rv);                  // avoid warning
 314
 315   if ((error = vlib_call_init_function (vm, ipsec_cli_init)))
 316     return error;
 317
 318   if ((error = vlib_call_init_function (vm, ipsec_tunnel_if_init)))
 319     return error;
 320
 321   vec_validate (im->crypto_algs, IPSEC_CRYPTO_N_ALG - 1);
 322
 323   a = im->crypto_algs + IPSEC_CRYPTO_ALG_NONE;
 324   a->enc_op_id = VNET_CRYPTO_OP_NONE;
 325   a->dec_op_id = VNET_CRYPTO_OP_NONE;
 326   a->alg = VNET_CRYPTO_ALG_NONE;
 327   a->iv_size = 0;
 328   a->block_size = 1;
 329
 330   a = im->crypto_algs + IPSEC_CRYPTO_ALG_DES_CBC;
 331   a->enc_op_id = VNET_CRYPTO_OP_DES_CBC_ENC;
 332   a->dec_op_id = VNET_CRYPTO_OP_DES_CBC_DEC;
 333   a->alg = VNET_CRYPTO_ALG_DES_CBC;
 334   a->iv_size = a->block_size = 8;
 335
 336   a = im->crypto_algs + IPSEC_CRYPTO_ALG_3DES_CBC;
 337   a->enc_op_id = VNET_CRYPTO_OP_3DES_CBC_ENC;
 338   a->dec_op_id = VNET_CRYPTO_OP_3DES_CBC_DEC;
 339   a->alg = VNET_CRYPTO_ALG_3DES_CBC;
 340   a->iv_size = a->block_size = 8;
 341
 342   a = im->crypto_algs + IPSEC_CRYPTO_ALG_AES_CBC_128;
 343   a->enc_op_id = VNET_CRYPTO_OP_AES_128_CBC_ENC;
 344   a->dec_op_id = VNET_CRYPTO_OP_AES_128_CBC_DEC;
 345   a->alg = VNET_CRYPTO_ALG_AES_128_CBC;
 346   a->iv_size = a->block_size = 16;
 347
 348   a = im->crypto_algs + IPSEC_CRYPTO_ALG_AES_CBC_192;
 349   a->enc_op_id = VNET_CRYPTO_OP_AES_192_CBC_ENC;
 350   a->dec_op_id = VNET_CRYPTO_OP_AES_192_CBC_DEC;
 351   a->alg = VNET_CRYPTO_ALG_AES_192_CBC;
 352   a->iv_size = a->block_size = 16;
 353
 354   a = im->crypto_algs + IPSEC_CRYPTO_ALG_AES_CBC_256;
 355   a->enc_op_id = VNET_CRYPTO_OP_AES_256_CBC_ENC;
 356   a->dec_op_id = VNET_CRYPTO_OP_AES_256_CBC_DEC;
 357   a->alg = VNET_CRYPTO_ALG_AES_256_CBC;
 358   a->iv_size = a->block_size = 16;
 359
 360   a = im->crypto_algs + IPSEC_CRYPTO_ALG_AES_GCM_128;
 361   a->enc_op_id = VNET_CRYPTO_OP_AES_128_GCM_ENC;
 362   a->dec_op_id = VNET_CRYPTO_OP_AES_128_GCM_DEC;
 363   a->alg = VNET_CRYPTO_ALG_AES_128_GCM;
 364   a->iv_size = a->block_size = 8;
 365   a->icv_size = 16;
 366
 367   a = im->crypto_algs + IPSEC_CRYPTO_ALG_AES_GCM_192;
 368   a->enc_op_id = VNET_CRYPTO_OP_AES_192_GCM_ENC;
 369   a->dec_op_id = VNET_CRYPTO_OP_AES_192_GCM_DEC;
 370   a->alg = VNET_CRYPTO_ALG_AES_192_GCM;
 371   a->iv_size = a->block_size = 8;
 372   a->icv_size = 16;
 373
 374   a = im->crypto_algs + IPSEC_CRYPTO_ALG_AES_GCM_256;
 375   a->enc_op_id = VNET_CRYPTO_OP_AES_256_GCM_ENC;
 376   a->dec_op_id = VNET_CRYPTO_OP_AES_256_GCM_DEC;
 377   a->alg = VNET_CRYPTO_ALG_AES_256_GCM;
 378   a->iv_size = a->block_size = 8;
 379   a->icv_size = 16;
 380
 381   vec_validate (im->integ_algs, IPSEC_INTEG_N_ALG - 1);
 382   ipsec_main_integ_alg_t *i;
 383
 384   i = &im->integ_algs[IPSEC_INTEG_ALG_MD5_96];
 385   i->op_id = VNET_CRYPTO_OP_MD5_HMAC;
 386   i->alg = VNET_CRYPTO_ALG_HMAC_MD5;
 387   i->icv_size = 12;
 388
 389   i = &im->integ_algs[IPSEC_INTEG_ALG_SHA1_96];
 390   i->op_id = VNET_CRYPTO_OP_SHA1_HMAC;
 391   i->alg = VNET_CRYPTO_ALG_HMAC_SHA1;
 392   i->icv_size = 12;
 393
 394   i = &im->integ_algs[IPSEC_INTEG_ALG_SHA_256_96];
 395   i->op_id = VNET_CRYPTO_OP_SHA1_HMAC;
 396   i->alg = VNET_CRYPTO_ALG_HMAC_SHA256;
 397   i->icv_size = 12;
 398
 399   i = &im->integ_algs[IPSEC_INTEG_ALG_SHA_256_128];
 400   i->op_id = VNET_CRYPTO_OP_SHA256_HMAC;
 401   i->alg = VNET_CRYPTO_ALG_HMAC_SHA256;
 402   i->icv_size = 16;
 403
 404   i = &im->integ_algs[IPSEC_INTEG_ALG_SHA_384_192];
 405   i->op_id = VNET_CRYPTO_OP_SHA384_HMAC;
 406   i->alg = VNET_CRYPTO_ALG_HMAC_SHA384;
 407   i->icv_size = 24;
 408
 409   i = &im->integ_algs[IPSEC_INTEG_ALG_SHA_512_256];
 410   i->op_id = VNET_CRYPTO_OP_SHA512_HMAC;
 411   i->alg = VNET_CRYPTO_ALG_HMAC_SHA512;
 412   i->icv_size = 32;
 413
 414   vec_validate_aligned (im->ptd, vlib_num_workers (), CLIB_CACHE_LINE_BYTES);
 415
 416   return 0;
 417 }
 418
 419 VLIB_INIT_FUNCTION (ipsec_init);
 420
 421 /*
 422  * fd.io coding-style-patch-verification: ON
 423  *
 424  * Local Variables:
 425  * eval: (c-set-style "gnu")
 426  * End:
 427  */