src/vnet/ipsec/ipsec.c

   1 /*
   2  * decap.c : IPSec tunnel support
   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/ikev2.h>
  26 #include <vnet/ipsec/esp.h>
  27 #include <vnet/ipsec/ah.h>
  28
  29
  30 ipsec_main_t ipsec_main;
  31
  32 u32
  33 ipsec_get_sa_index_by_sa_id (u32 sa_id)
  34 {
  35   ipsec_main_t *im = &ipsec_main;
  36   uword *p = hash_get (im->sa_index_by_sa_id, sa_id);
  37   if (!p)
  38     return ~0;
  39
  40   return p[0];
  41 }
  42
  43 int
  44 ipsec_set_interface_spd (vlib_main_t * vm, u32 sw_if_index, u32 spd_id,
  45                          int is_add)
  46 {
  47   ipsec_main_t *im = &ipsec_main;
  48   ip4_ipsec_config_t config;
  49
  50   u32 spd_index;
  51   uword *p;
  52
  53   p = hash_get (im->spd_index_by_spd_id, spd_id);
  54   if (!p)
  55     return VNET_API_ERROR_SYSCALL_ERROR_1;      /* no such spd-id */
  56
  57   spd_index = p[0];
  58
  59   p = hash_get (im->spd_index_by_sw_if_index, sw_if_index);
  60   if (p && is_add)
  61     return VNET_API_ERROR_SYSCALL_ERROR_1;      /* spd already assigned */
  62
  63   if (is_add)
  64     {
  65       hash_set (im->spd_index_by_sw_if_index, sw_if_index, spd_index);
  66     }
  67   else
  68     {
  69       hash_unset (im->spd_index_by_sw_if_index, sw_if_index);
  70     }
  71
  72   clib_warning ("sw_if_index %u spd_id %u spd_index %u",
  73                 sw_if_index, spd_id, spd_index);
  74
  75   /* enable IPsec on TX */
  76   vnet_feature_enable_disable ("ip4-output", "ipsec-output-ip4", sw_if_index,
  77                                is_add, 0, 0);
  78   vnet_feature_enable_disable ("ip6-output", "ipsec-output-ip6", sw_if_index,
  79                                is_add, 0, 0);
  80
  81   /* enable IPsec on RX */
  82   vnet_feature_enable_disable ("ip4-unicast", "ipsec-input-ip4", sw_if_index,
  83                                is_add, &config, sizeof (config));
  84   vnet_feature_enable_disable ("ip6-unicast", "ipsec-input-ip6", sw_if_index,
  85                                is_add, &config, sizeof (config));
  86
  87   return 0;
  88 }
  89
  90 int
  91 ipsec_add_del_spd (vlib_main_t * vm, u32 spd_id, int is_add)
  92 {
  93   ipsec_main_t *im = &ipsec_main;
  94   ipsec_spd_t *spd = 0;
  95   uword *p;
  96   u32 spd_index, k, v;
  97
  98   p = hash_get (im->spd_index_by_spd_id, spd_id);
  99   if (p && is_add)
 100     return VNET_API_ERROR_INVALID_VALUE;
 101   if (!p && !is_add)
 102     return VNET_API_ERROR_INVALID_VALUE;
 103
 104   if (!is_add)                  /* delete */
 105     {
 106       spd_index = p[0];
 107       spd = pool_elt_at_index (im->spds, spd_index);
 108       if (!spd)
 109         return VNET_API_ERROR_INVALID_VALUE;
 110       /* *INDENT-OFF* */
 111       hash_foreach (k, v, im->spd_index_by_sw_if_index, ({
 112         if (v == spd_index)
 113           ipsec_set_interface_spd(vm, k, spd_id, 0);
 114       }));
 115       /* *INDENT-ON* */
 116       hash_unset (im->spd_index_by_spd_id, spd_id);
 117       pool_free (spd->policies);
 118       vec_free (spd->ipv4_outbound_policies);
 119       vec_free (spd->ipv6_outbound_policies);
 120       vec_free (spd->ipv4_inbound_protect_policy_indices);
 121       vec_free (spd->ipv4_inbound_policy_discard_and_bypass_indices);
 122       pool_put (im->spds, spd);
 123     }
 124   else                          /* create new SPD */
 125     {
 126       pool_get (im->spds, spd);
 127       memset (spd, 0, sizeof (*spd));
 128       spd_index = spd - im->spds;
 129       spd->id = spd_id;
 130       hash_set (im->spd_index_by_spd_id, spd_id, spd_index);
 131     }
 132   return 0;
 133 }
 134
 135 static int
 136 ipsec_spd_entry_sort (void *a1, void *a2)
 137 {
 138   u32 *id1 = a1;
 139   u32 *id2 = a2;
 140   ipsec_spd_t *spd = ipsec_main.spd_to_sort;
 141   ipsec_policy_t *p1, *p2;
 142
 143   p1 = pool_elt_at_index (spd->policies, *id1);
 144   p2 = pool_elt_at_index (spd->policies, *id2);
 145   if (p1 && p2)
 146     return p2->priority - p1->priority;
 147
 148   return 0;
 149 }
 150
 151 int
 152 ipsec_add_del_policy (vlib_main_t * vm, ipsec_policy_t * policy, int is_add)
 153 {
 154   ipsec_main_t *im = &ipsec_main;
 155   ipsec_spd_t *spd = 0;
 156   ipsec_policy_t *vp;
 157   uword *p;
 158   u32 spd_index;
 159
 160   clib_warning ("policy-id %u priority %d is_outbound %u", policy->id,
 161                 policy->priority, policy->is_outbound);
 162
 163   if (policy->policy == IPSEC_POLICY_ACTION_PROTECT)
 164     {
 165       p = hash_get (im->sa_index_by_sa_id, policy->sa_id);
 166       if (!p)
 167         return VNET_API_ERROR_SYSCALL_ERROR_1;
 168       policy->sa_index = p[0];
 169     }
 170
 171   p = hash_get (im->spd_index_by_spd_id, policy->id);
 172
 173   if (!p)
 174     return VNET_API_ERROR_SYSCALL_ERROR_1;
 175
 176   spd_index = p[0];
 177   spd = pool_elt_at_index (im->spds, spd_index);
 178   if (!spd)
 179     return VNET_API_ERROR_SYSCALL_ERROR_1;
 180
 181   if (is_add)
 182     {
 183       u32 policy_index;
 184
 185       pool_get (spd->policies, vp);
 186       clib_memcpy (vp, policy, sizeof (*vp));
 187       policy_index = vp - spd->policies;
 188
 189       ipsec_main.spd_to_sort = spd;
 190
 191       if (policy->is_outbound)
 192         {
 193           if (policy->is_ipv6)
 194             {
 195               vec_add1 (spd->ipv6_outbound_policies, policy_index);
 196               clib_memcpy (vp, policy, sizeof (ipsec_policy_t));
 197               vec_sort_with_function (spd->ipv6_outbound_policies,
 198                                       ipsec_spd_entry_sort);
 199             }
 200           else
 201             {
 202               vec_add1 (spd->ipv4_outbound_policies, policy_index);
 203               clib_memcpy (vp, policy, sizeof (ipsec_policy_t));
 204               vec_sort_with_function (spd->ipv4_outbound_policies,
 205                                       ipsec_spd_entry_sort);
 206             }
 207         }
 208       else
 209         {
 210           if (policy->is_ipv6)
 211             {
 212               if (policy->policy == IPSEC_POLICY_ACTION_PROTECT)
 213                 {
 214                   vec_add1 (spd->ipv6_inbound_protect_policy_indices,
 215                             policy_index);
 216                   clib_memcpy (vp, policy, sizeof (ipsec_policy_t));
 217                   vec_sort_with_function
 218                     (spd->ipv6_inbound_protect_policy_indices,
 219                      ipsec_spd_entry_sort);
 220                 }
 221               else
 222                 {
 223                   vec_add1
 224                     (spd->ipv6_inbound_policy_discard_and_bypass_indices,
 225                      policy_index);
 226                   clib_memcpy (vp, policy, sizeof (ipsec_policy_t));
 227                   vec_sort_with_function
 228                     (spd->ipv6_inbound_policy_discard_and_bypass_indices,
 229                      ipsec_spd_entry_sort);
 230                 }
 231             }
 232           else
 233             {
 234               if (policy->policy == IPSEC_POLICY_ACTION_PROTECT)
 235                 {
 236                   vec_add1 (spd->ipv4_inbound_protect_policy_indices,
 237                             policy_index);
 238                   clib_memcpy (vp, policy, sizeof (ipsec_policy_t));
 239                   vec_sort_with_function
 240                     (spd->ipv4_inbound_protect_policy_indices,
 241                      ipsec_spd_entry_sort);
 242                 }
 243               else
 244                 {
 245                   vec_add1
 246                     (spd->ipv4_inbound_policy_discard_and_bypass_indices,
 247                      policy_index);
 248                   clib_memcpy (vp, policy, sizeof (ipsec_policy_t));
 249                   vec_sort_with_function
 250                     (spd->ipv4_inbound_policy_discard_and_bypass_indices,
 251                      ipsec_spd_entry_sort);
 252                 }
 253             }
 254         }
 255
 256       ipsec_main.spd_to_sort = NULL;
 257     }
 258   else
 259     {
 260       u32 i, j;
 261       /* *INDENT-OFF* */
 262       pool_foreach_index(i, spd->policies, ({
 263         vp = pool_elt_at_index(spd->policies, i);
 264         if (vp->priority != policy->priority)
 265           continue;
 266         if (vp->is_outbound != policy->is_outbound)
 267           continue;
 268         if (vp->policy != policy->policy)
 269           continue;
 270         if (vp->sa_id != policy->sa_id)
 271           continue;
 272         if (vp->protocol != policy->protocol)
 273           continue;
 274         if (vp->lport.start != policy->lport.start)
 275           continue;
 276         if (vp->lport.stop != policy->lport.stop)
 277           continue;
 278         if (vp->rport.start != policy->rport.start)
 279           continue;
 280         if (vp->rport.stop != policy->rport.stop)
 281           continue;
 282         if (vp->is_ipv6 != policy->is_ipv6)
 283           continue;
 284         if (policy->is_ipv6)
 285           {
 286             if (vp->laddr.start.ip6.as_u64[0] != policy->laddr.start.ip6.as_u64[0])
 287               continue;
 288             if (vp->laddr.start.ip6.as_u64[1] != policy->laddr.start.ip6.as_u64[1])
 289               continue;
 290             if (vp->laddr.stop.ip6.as_u64[0] != policy->laddr.stop.ip6.as_u64[0])
 291               continue;
 292             if (vp->laddr.stop.ip6.as_u64[1] != policy->laddr.stop.ip6.as_u64[1])
 293               continue;
 294             if (vp->raddr.start.ip6.as_u64[0] != policy->raddr.start.ip6.as_u64[0])
 295               continue;
 296             if (vp->raddr.start.ip6.as_u64[1] != policy->raddr.start.ip6.as_u64[1])
 297               continue;
 298             if (vp->raddr.stop.ip6.as_u64[0] != policy->raddr.stop.ip6.as_u64[0])
 299               continue;
 300            if (vp->laddr.stop.ip6.as_u64[1] != policy->laddr.stop.ip6.as_u64[1])
 301               continue;
 302            if (policy->is_outbound)
 303              {
 304                vec_foreach_index(j, spd->ipv6_outbound_policies) {
 305                  if (vec_elt(spd->ipv6_outbound_policies, j) == i) {
 306                    vec_del1 (spd->ipv6_outbound_policies, j);
 307                    break;
 308                  }
 309                }
 310              }
 311            else
 312              {
 313                if (policy->policy == IPSEC_POLICY_ACTION_PROTECT)
 314                  {
 315                    vec_foreach_index(j, spd->ipv6_inbound_protect_policy_indices) {
 316                      if (vec_elt(spd->ipv6_inbound_protect_policy_indices, j) == i) {
 317                        vec_del1 (spd->ipv6_inbound_protect_policy_indices, j);
 318                        break;
 319                      }
 320                    }
 321                  }
 322                else
 323                  {
 324                    vec_foreach_index(j, spd->ipv6_inbound_policy_discard_and_bypass_indices) {
 325                      if (vec_elt(spd->ipv6_inbound_policy_discard_and_bypass_indices, j) == i) {
 326                        vec_del1 (spd->ipv6_inbound_policy_discard_and_bypass_indices, j);
 327                        break;
 328                      }
 329                    }
 330                  }
 331              }
 332           }
 333         else
 334           {
 335             if (vp->laddr.start.ip4.as_u32 != policy->laddr.start.ip4.as_u32)
 336               continue;
 337             if (vp->laddr.stop.ip4.as_u32 != policy->laddr.stop.ip4.as_u32)
 338               continue;
 339             if (vp->raddr.start.ip4.as_u32 != policy->raddr.start.ip4.as_u32)
 340               continue;
 341             if (vp->raddr.stop.ip4.as_u32 != policy->raddr.stop.ip4.as_u32)
 342               continue;
 343             if (policy->is_outbound)
 344               {
 345                 vec_foreach_index(j, spd->ipv4_outbound_policies) {
 346                   if (vec_elt(spd->ipv4_outbound_policies, j) == i) {
 347                     vec_del1 (spd->ipv4_outbound_policies, j);
 348                     break;
 349                   }
 350                 }
 351               }
 352             else
 353               {
 354                 if (policy->policy == IPSEC_POLICY_ACTION_PROTECT)
 355                   {
 356                     vec_foreach_index(j, spd->ipv4_inbound_protect_policy_indices) {
 357                       if (vec_elt(spd->ipv4_inbound_protect_policy_indices, j) == i) {
 358                         vec_del1 (spd->ipv4_inbound_protect_policy_indices, j);
 359                         break;
 360                       }
 361                     }
 362                   }
 363                 else
 364                   {
 365                     vec_foreach_index(j, spd->ipv4_inbound_policy_discard_and_bypass_indices) {
 366                       if (vec_elt(spd->ipv4_inbound_policy_discard_and_bypass_indices, j) == i) {
 367                         vec_del1 (spd->ipv4_inbound_policy_discard_and_bypass_indices, j);
 368                         break;
 369                       }
 370                     }
 371                   }
 372               }
 373           }
 374           pool_put (spd->policies, vp);
 375           break;
 376       }));
 377       /* *INDENT-ON* */
 378     }
 379
 380   return 0;
 381 }
 382
 383 u8
 384 ipsec_is_sa_used (u32 sa_index)
 385 {
 386   ipsec_main_t *im = &ipsec_main;
 387   ipsec_spd_t *spd;
 388   ipsec_policy_t *p;
 389   ipsec_tunnel_if_t *t;
 390
 391   /* *INDENT-OFF* */
 392   pool_foreach(spd, im->spds, ({
 393     pool_foreach(p, spd->policies, ({
 394       if (p->policy == IPSEC_POLICY_ACTION_PROTECT)
 395         {
 396           if (p->sa_index == sa_index)
 397             return 1;
 398         }
 399     }));
 400   }));
 401
 402   pool_foreach(t, im->tunnel_interfaces, ({
 403     if (t->input_sa_index == sa_index)
 404       return 1;
 405     if (t->output_sa_index == sa_index)
 406       return 1;
 407   }));
 408   /* *INDENT-ON* */
 409
 410   return 0;
 411 }
 412
 413 int
 414 ipsec_add_del_sa (vlib_main_t * vm, ipsec_sa_t * new_sa, int is_add,
 415                   u8 udp_encap)
 416 {
 417   ipsec_main_t *im = &ipsec_main;
 418   ipsec_sa_t *sa = 0;
 419   uword *p;
 420   u32 sa_index;
 421   clib_error_t *err;
 422
 423   clib_warning ("id %u spi %u", new_sa->id, new_sa->spi);
 424
 425   p = hash_get (im->sa_index_by_sa_id, new_sa->id);
 426   if (p && is_add)
 427     return VNET_API_ERROR_SYSCALL_ERROR_1;      /* already exists */
 428   if (!p && !is_add)
 429     return VNET_API_ERROR_SYSCALL_ERROR_1;
 430
 431   if (!is_add)                  /* delete */
 432     {
 433       sa_index = p[0];
 434       sa = pool_elt_at_index (im->sad, sa_index);
 435       if (ipsec_is_sa_used (sa_index))
 436         {
 437           clib_warning ("sa_id %u used in policy", sa->id);
 438           return VNET_API_ERROR_SYSCALL_ERROR_1;        /* sa used in policy */
 439         }
 440       hash_unset (im->sa_index_by_sa_id, sa->id);
 441       if (im->cb.add_del_sa_sess_cb)
 442         {
 443           err = im->cb.add_del_sa_sess_cb (sa_index, 0);
 444           if (err)
 445             return VNET_API_ERROR_SYSCALL_ERROR_1;
 446         }
 447       pool_put (im->sad, sa);
 448     }
 449   else                          /* create new SA */
 450     {
 451       pool_get (im->sad, sa);
 452       clib_memcpy (sa, new_sa, sizeof (*sa));
 453       sa_index = sa - im->sad;
 454       sa->udp_encap = udp_encap ? 1 : 0;
 455       hash_set (im->sa_index_by_sa_id, sa->id, sa_index);
 456       if (im->cb.add_del_sa_sess_cb)
 457         {
 458           err = im->cb.add_del_sa_sess_cb (sa_index, 1);
 459           if (err)
 460             return VNET_API_ERROR_SYSCALL_ERROR_1;
 461         }
 462     }
 463   return 0;
 464 }
 465
 466 int
 467 ipsec_set_sa_key (vlib_main_t * vm, ipsec_sa_t * sa_update)
 468 {
 469   ipsec_main_t *im = &ipsec_main;
 470   uword *p;
 471   u32 sa_index;
 472   ipsec_sa_t *sa = 0;
 473   clib_error_t *err;
 474
 475   p = hash_get (im->sa_index_by_sa_id, sa_update->id);
 476   if (!p)
 477     return VNET_API_ERROR_SYSCALL_ERROR_1;      /* no such sa-id */
 478
 479   sa_index = p[0];
 480   sa = pool_elt_at_index (im->sad, sa_index);
 481
 482   /* new crypto key */
 483   if (0 < sa_update->crypto_key_len)
 484     {
 485       clib_memcpy (sa->crypto_key, sa_update->crypto_key,
 486                    sa_update->crypto_key_len);
 487       sa->crypto_key_len = sa_update->crypto_key_len;
 488     }
 489
 490   /* new integ key */
 491   if (0 < sa_update->integ_key_len)
 492     {
 493       clib_memcpy (sa->integ_key, sa_update->integ_key,
 494                    sa_update->integ_key_len);
 495       sa->integ_key_len = sa_update->integ_key_len;
 496     }
 497
 498   if (0 < sa_update->crypto_key_len || 0 < sa_update->integ_key_len)
 499     {
 500       if (im->cb.add_del_sa_sess_cb)
 501         {
 502           err = im->cb.add_del_sa_sess_cb (sa_index, 0);
 503           if (err)
 504             return VNET_API_ERROR_SYSCALL_ERROR_1;
 505         }
 506     }
 507
 508   return 0;
 509 }
 510
 511 static void
 512 ipsec_rand_seed (void)
 513 {
 514   struct
 515   {
 516     time_t time;
 517     pid_t pid;
 518     void *p;
 519   } seed_data;
 520
 521   seed_data.time = time (NULL);
 522   seed_data.pid = getpid ();
 523   seed_data.p = (void *) &seed_data;
 524
 525   RAND_seed ((const void *) &seed_data, sizeof (seed_data));
 526 }
 527
 528 static clib_error_t *
 529 ipsec_check_support (ipsec_sa_t * sa)
 530 {
 531   if (sa->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128)
 532     return clib_error_return (0, "unsupported aes-gcm-128 crypto-alg");
 533   if (sa->integ_alg == IPSEC_INTEG_ALG_NONE)
 534     return clib_error_return (0, "unsupported none integ-alg");
 535
 536   return 0;
 537 }
 538
 539 static clib_error_t *
 540 ipsec_init (vlib_main_t * vm)
 541 {
 542   clib_error_t *error;
 543   ipsec_main_t *im = &ipsec_main;
 544   vlib_thread_main_t *tm = vlib_get_thread_main ();
 545   vlib_node_t *node;
 546
 547   ipsec_rand_seed ();
 548
 549   memset (im, 0, sizeof (im[0]));
 550
 551   im->vnet_main = vnet_get_main ();
 552   im->vlib_main = vm;
 553
 554   im->spd_index_by_spd_id = hash_create (0, sizeof (uword));
 555   im->sa_index_by_sa_id = hash_create (0, sizeof (uword));
 556   im->spd_index_by_sw_if_index = hash_create (0, sizeof (uword));
 557
 558   vec_validate_aligned (im->empty_buffers, tm->n_vlib_mains - 1,
 559                         CLIB_CACHE_LINE_BYTES);
 560
 561   node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
 562   ASSERT (node);
 563   im->error_drop_node_index = node->index;
 564
 565   node = vlib_get_node_by_name (vm, (u8 *) "esp-encrypt");
 566   ASSERT (node);
 567   im->esp_encrypt_node_index = node->index;
 568
 569   node = vlib_get_node_by_name (vm, (u8 *) "esp-decrypt");
 570   ASSERT (node);
 571   im->esp_decrypt_node_index = node->index;
 572
 573   node = vlib_get_node_by_name (vm, (u8 *) "ah-encrypt");
 574   ASSERT (node);
 575   im->ah_encrypt_node_index = node->index;
 576
 577   node = vlib_get_node_by_name (vm, (u8 *) "ah-decrypt");
 578   ASSERT (node);
 579   im->ah_decrypt_node_index = node->index;
 580
 581   im->esp_encrypt_next_index = IPSEC_OUTPUT_NEXT_ESP_ENCRYPT;
 582   im->esp_decrypt_next_index = IPSEC_INPUT_NEXT_ESP_DECRYPT;
 583   im->ah_encrypt_next_index = IPSEC_OUTPUT_NEXT_AH_ENCRYPT;
 584   im->ah_decrypt_next_index = IPSEC_INPUT_NEXT_AH_DECRYPT;
 585
 586   im->cb.check_support_cb = ipsec_check_support;
 587
 588   if ((error = vlib_call_init_function (vm, ipsec_cli_init)))
 589     return error;
 590
 591   if ((error = vlib_call_init_function (vm, ipsec_tunnel_if_init)))
 592     return error;
 593
 594   ipsec_proto_init ();
 595
 596   if ((error = ikev2_init (vm)))
 597     return error;
 598
 599   return 0;
 600 }
 601
 602 VLIB_INIT_FUNCTION (ipsec_init);
 603
 604 /*
 605  * fd.io coding-style-patch-verification: ON
 606  *
 607  * Local Variables:
 608  * eval: (c-set-style "gnu")
 609  * End:
 610  */