src/plugins/nat/nat64.c

   1 /*
   2  * Copyright (c) 2017 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 /**
  16  * @file
  17  * @brief NAT64 implementation
  18  */
  19
  20 #include <nat/nat64.h>
  21 #include <nat/nat64_db.h>
  22 #include <nat/nat_reass.h>
  23 #include <nat/nat_inlines.h>
  24 #include <vnet/fib/ip4_fib.h>
  25 #include <vppinfra/crc32.h>
  26
  27
  28 nat64_main_t nat64_main;
  29
  30 /* *INDENT-OFF* */
  31
  32 /* Hook up input features */
  33 VNET_FEATURE_INIT (nat64_in2out, static) = {
  34   .arc_name = "ip6-unicast",
  35   .node_name = "nat64-in2out",
  36   .runs_before = VNET_FEATURES ("ip6-lookup"),
  37 };
  38 VNET_FEATURE_INIT (nat64_out2in, static) = {
  39   .arc_name = "ip4-unicast",
  40   .node_name = "nat64-out2in",
  41   .runs_before = VNET_FEATURES ("ip4-lookup"),
  42 };
  43 VNET_FEATURE_INIT (nat64_in2out_handoff, static) = {
  44   .arc_name = "ip6-unicast",
  45   .node_name = "nat64-in2out-handoff",
  46   .runs_before = VNET_FEATURES ("ip6-lookup"),
  47 };
  48 VNET_FEATURE_INIT (nat64_out2in_handoff, static) = {
  49   .arc_name = "ip4-unicast",
  50   .node_name = "nat64-out2in-handoff",
  51   .runs_before = VNET_FEATURES ("ip4-lookup"),
  52 };
  53
  54
  55 static u8 well_known_prefix[] = {
  56   0x00, 0x64, 0xff, 0x9b,
  57   0x00, 0x00, 0x00, 0x00,
  58   0x00, 0x00, 0x00, 0x00,
  59   0x00, 0x00, 0x00, 0x00
  60 };
  61
  62 /* *INDENT-ON* */
  63
  64 static void
  65 nat64_ip4_add_del_interface_address_cb (ip4_main_t * im, uword opaque,
  66                                         u32 sw_if_index,
  67                                         ip4_address_t * address,
  68                                         u32 address_length,
  69                                         u32 if_address_index, u32 is_delete)
  70 {
  71   nat64_main_t *nm = &nat64_main;
  72   int i, j;
  73
  74   for (i = 0; i < vec_len (nm->auto_add_sw_if_indices); i++)
  75     {
  76       if (sw_if_index == nm->auto_add_sw_if_indices[i])
  77         {
  78           if (!is_delete)
  79             {
  80               /* Don't trip over lease renewal, static config */
  81               for (j = 0; j < vec_len (nm->addr_pool); j++)
  82                 if (nm->addr_pool[j].addr.as_u32 == address->as_u32)
  83                   return;
  84
  85               (void) nat64_add_del_pool_addr (address, ~0, 1);
  86               return;
  87             }
  88           else
  89             {
  90               (void) nat64_add_del_pool_addr (address, ~0, 0);
  91               return;
  92             }
  93         }
  94     }
  95 }
  96
  97 u32
  98 nat64_get_worker_in2out (ip6_address_t * addr)
  99 {
 100   nat64_main_t *nm = &nat64_main;
 101   snat_main_t *sm = nm->sm;
 102   u32 next_worker_index = nm->sm->first_worker_index;
 103   u32 hash;
 104
 105 #ifdef clib_crc32c_uses_intrinsics
 106   hash = clib_crc32c ((u8 *) addr->as_u32, 16);
 107 #else
 108   u64 tmp = addr->as_u64[0] ^ addr->as_u64[1];
 109   hash = clib_xxhash (tmp);
 110 #endif
 111
 112   if (PREDICT_TRUE (is_pow2 (_vec_len (sm->workers))))
 113     next_worker_index += sm->workers[hash & (_vec_len (sm->workers) - 1)];
 114   else
 115     next_worker_index += sm->workers[hash % _vec_len (sm->workers)];
 116
 117   return next_worker_index;
 118 }
 119
 120 u32
 121 nat64_get_worker_out2in (ip4_header_t * ip)
 122 {
 123   nat64_main_t *nm = &nat64_main;
 124   snat_main_t *sm = nm->sm;
 125   udp_header_t *udp;
 126   u16 port;
 127   u32 proto;
 128
 129   proto = ip_proto_to_snat_proto (ip->protocol);
 130   udp = ip4_next_header (ip);
 131   port = udp->dst_port;
 132
 133   /* fragments */
 134   if (PREDICT_FALSE (ip4_is_fragment (ip)))
 135     {
 136       if (PREDICT_FALSE (nat_reass_is_drop_frag (0)))
 137         return vlib_get_thread_index ();
 138
 139       if (PREDICT_TRUE (!ip4_is_first_fragment (ip)))
 140         {
 141           nat_reass_ip4_t *reass;
 142
 143           reass = nat_ip4_reass_find (ip->src_address, ip->dst_address,
 144                                       ip->fragment_id, ip->protocol);
 145
 146           if (reass && (reass->thread_index != (u32) ~ 0))
 147             return reass->thread_index;
 148           else
 149             return vlib_get_thread_index ();
 150         }
 151     }
 152
 153   /* unknown protocol */
 154   if (PREDICT_FALSE (proto == ~0))
 155     {
 156       nat64_db_t *db;
 157       ip46_address_t daddr;
 158       nat64_db_bib_entry_t *bibe;
 159
 160       memset (&daddr, 0, sizeof (daddr));
 161       daddr.ip4.as_u32 = ip->dst_address.as_u32;
 162
 163       /* *INDENT-OFF* */
 164       vec_foreach (db, nm->db)
 165         {
 166           bibe = nat64_db_bib_entry_find (db, &daddr, 0, ip->protocol, 0, 0);
 167           if (bibe)
 168             return (u32) (db - nm->db);
 169         }
 170       /* *INDENT-ON* */
 171       return vlib_get_thread_index ();
 172     }
 173
 174   /* ICMP */
 175   if (PREDICT_FALSE (ip->protocol == IP_PROTOCOL_ICMP))
 176     {
 177       icmp46_header_t *icmp = (icmp46_header_t *) udp;
 178       icmp_echo_header_t *echo = (icmp_echo_header_t *) (icmp + 1);
 179       if (!icmp_is_error_message (icmp))
 180         port = echo->identifier;
 181       else
 182         {
 183           ip4_header_t *inner_ip = (ip4_header_t *) (echo + 1);
 184           proto = ip_proto_to_snat_proto (inner_ip->protocol);
 185           void *l4_header = ip4_next_header (inner_ip);
 186           switch (proto)
 187             {
 188             case SNAT_PROTOCOL_ICMP:
 189               icmp = (icmp46_header_t *) l4_header;
 190               echo = (icmp_echo_header_t *) (icmp + 1);
 191               port = echo->identifier;
 192               break;
 193             case SNAT_PROTOCOL_UDP:
 194             case SNAT_PROTOCOL_TCP:
 195               port = ((tcp_udp_header_t *) l4_header)->src_port;
 196               break;
 197             default:
 198               return vlib_get_thread_index ();
 199             }
 200         }
 201     }
 202
 203   /* worker by outside port  (TCP/UDP) */
 204   port = clib_net_to_host_u16 (port);
 205   if (port > 1024)
 206     return nm->sm->first_worker_index + ((port - 1024) / sm->port_per_thread);
 207
 208   return vlib_get_thread_index ();
 209 }
 210
 211 clib_error_t *
 212 nat64_init (vlib_main_t * vm)
 213 {
 214   nat64_main_t *nm = &nat64_main;
 215   vlib_thread_main_t *tm = vlib_get_thread_main ();
 216   ip4_add_del_interface_address_callback_t cb4;
 217   ip4_main_t *im = &ip4_main;
 218   vlib_node_t *error_drop_node =
 219     vlib_get_node_by_name (vm, (u8 *) "error-drop");
 220
 221   vec_validate (nm->db, tm->n_vlib_mains - 1);
 222
 223   nm->sm = &snat_main;
 224
 225   nm->fq_in2out_index = ~0;
 226   nm->fq_out2in_index = ~0;
 227   nm->error_node_index = error_drop_node->index;
 228
 229   /* set session timeouts to default values */
 230   nm->udp_timeout = SNAT_UDP_TIMEOUT;
 231   nm->icmp_timeout = SNAT_ICMP_TIMEOUT;
 232   nm->tcp_trans_timeout = SNAT_TCP_TRANSITORY_TIMEOUT;
 233   nm->tcp_est_timeout = SNAT_TCP_ESTABLISHED_TIMEOUT;
 234
 235   nm->total_enabled_count = 0;
 236
 237   /* Set up the interface address add/del callback */
 238   cb4.function = nat64_ip4_add_del_interface_address_cb;
 239   cb4.function_opaque = 0;
 240   vec_add1 (im->add_del_interface_address_callbacks, cb4);
 241   nm->ip4_main = im;
 242
 243   return 0;
 244 }
 245
 246 static void nat64_free_out_addr_and_port (struct nat64_db_s *db,
 247                                           ip4_address_t * addr, u16 port,
 248                                           u8 protocol);
 249
 250 void
 251 nat64_set_hash (u32 bib_buckets, u32 bib_memory_size, u32 st_buckets,
 252                 u32 st_memory_size)
 253 {
 254   nat64_main_t *nm = &nat64_main;
 255   nat64_db_t *db;
 256
 257   nm->bib_buckets = bib_buckets;
 258   nm->bib_memory_size = bib_memory_size;
 259   nm->st_buckets = st_buckets;
 260   nm->st_memory_size = st_memory_size;
 261
 262   /* *INDENT-OFF* */
 263   vec_foreach (db, nm->db)
 264     {
 265       if (nat64_db_init (db, bib_buckets, bib_memory_size, st_buckets,
 266                          st_memory_size, nat64_free_out_addr_and_port))
 267         nat_log_err ("NAT64 DB init failed");
 268     }
 269   /* *INDENT-ON* */
 270 }
 271
 272 int
 273 nat64_add_del_pool_addr (ip4_address_t * addr, u32 vrf_id, u8 is_add)
 274 {
 275   nat64_main_t *nm = &nat64_main;
 276   snat_address_t *a = 0;
 277   snat_interface_t *interface;
 278   int i;
 279   nat64_db_t *db;
 280   vlib_thread_main_t *tm = vlib_get_thread_main ();
 281
 282   /* Check if address already exists */
 283   for (i = 0; i < vec_len (nm->addr_pool); i++)
 284     {
 285       if (nm->addr_pool[i].addr.as_u32 == addr->as_u32)
 286         {
 287           a = nm->addr_pool + i;
 288           break;
 289         }
 290     }
 291
 292   if (is_add)
 293     {
 294       if (a)
 295         return VNET_API_ERROR_VALUE_EXIST;
 296
 297       vec_add2 (nm->addr_pool, a, 1);
 298       a->addr = *addr;
 299       a->fib_index = ~0;
 300       if (vrf_id != ~0)
 301         a->fib_index =
 302           fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, vrf_id,
 303                                              FIB_SOURCE_PLUGIN_HI);
 304 #define _(N, id, n, s) \
 305       clib_bitmap_alloc (a->busy_##n##_port_bitmap, 65535); \
 306       a->busy_##n##_ports = 0; \
 307       vec_validate_init_empty (a->busy_##n##_ports_per_thread, tm->n_vlib_mains - 1, 0);
 308       foreach_snat_protocol
 309 #undef _
 310     }
 311   else
 312     {
 313       if (!a)
 314         return VNET_API_ERROR_NO_SUCH_ENTRY;
 315
 316       if (a->fib_index != ~0)
 317         fib_table_unlock (a->fib_index, FIB_PROTOCOL_IP6,
 318                           FIB_SOURCE_PLUGIN_HI);
 319       /* Delete sessions using address */
 320         /* *INDENT-OFF* */
 321         vec_foreach (db, nm->db)
 322           nat64_db_free_out_addr (db, &a->addr);
 323 #define _(N, id, n, s) \
 324       clib_bitmap_free (a->busy_##n##_port_bitmap);
 325       foreach_snat_protocol
 326 #undef _
 327         /* *INDENT-ON* */
 328       vec_del1 (nm->addr_pool, i);
 329     }
 330
 331   /* Add/del external address to FIB */
 332   /* *INDENT-OFF* */
 333   pool_foreach (interface, nm->interfaces,
 334   ({
 335     if (nat_interface_is_inside(interface))
 336       continue;
 337
 338     snat_add_del_addr_to_fib (addr, 32, interface->sw_if_index, is_add);
 339     break;
 340   }));
 341   /* *INDENT-ON* */
 342
 343   return 0;
 344 }
 345
 346 void
 347 nat64_pool_addr_walk (nat64_pool_addr_walk_fn_t fn, void *ctx)
 348 {
 349   nat64_main_t *nm = &nat64_main;
 350   snat_address_t *a = 0;
 351
 352   /* *INDENT-OFF* */
 353   vec_foreach (a, nm->addr_pool)
 354     {
 355       if (fn (a, ctx))
 356         break;
 357     };
 358   /* *INDENT-ON* */
 359 }
 360
 361 int
 362 nat64_add_interface_address (u32 sw_if_index, int is_add)
 363 {
 364   nat64_main_t *nm = &nat64_main;
 365   ip4_main_t *ip4_main = nm->ip4_main;
 366   ip4_address_t *first_int_addr;
 367   int i;
 368
 369   first_int_addr = ip4_interface_first_address (ip4_main, sw_if_index, 0);
 370
 371   for (i = 0; i < vec_len (nm->auto_add_sw_if_indices); i++)
 372     {
 373       if (nm->auto_add_sw_if_indices[i] == sw_if_index)
 374         {
 375           if (is_add)
 376             return VNET_API_ERROR_VALUE_EXIST;
 377           else
 378             {
 379               /* if have address remove it */
 380               if (first_int_addr)
 381                 (void) nat64_add_del_pool_addr (first_int_addr, ~0, 0);
 382
 383               vec_del1 (nm->auto_add_sw_if_indices, i);
 384               return 0;
 385             }
 386         }
 387     }
 388
 389   if (!is_add)
 390     return VNET_API_ERROR_NO_SUCH_ENTRY;
 391
 392   /* add to the auto-address list */
 393   vec_add1 (nm->auto_add_sw_if_indices, sw_if_index);
 394
 395   /* If the address is already bound - or static - add it now */
 396   if (first_int_addr)
 397     (void) nat64_add_del_pool_addr (first_int_addr, ~0, 1);
 398
 399   return 0;
 400 }
 401
 402 int
 403 nat64_add_del_interface (u32 sw_if_index, u8 is_inside, u8 is_add)
 404 {
 405   nat64_main_t *nm = &nat64_main;
 406   snat_interface_t *interface = 0, *i;
 407   snat_address_t *ap;
 408   const char *feature_name, *arc_name;
 409
 410   /* Check if interface already exists */
 411   /* *INDENT-OFF* */
 412   pool_foreach (i, nm->interfaces,
 413   ({
 414     if (i->sw_if_index == sw_if_index)
 415       {
 416         interface = i;
 417         break;
 418       }
 419   }));
 420   /* *INDENT-ON* */
 421
 422   if (is_add)
 423     {
 424       if (interface)
 425         goto set_flags;
 426
 427       pool_get (nm->interfaces, interface);
 428       interface->sw_if_index = sw_if_index;
 429       interface->flags = 0;
 430     set_flags:
 431       if (is_inside)
 432         interface->flags |= NAT_INTERFACE_FLAG_IS_INSIDE;
 433       else
 434         interface->flags |= NAT_INTERFACE_FLAG_IS_OUTSIDE;
 435
 436       nm->total_enabled_count++;
 437       vlib_process_signal_event (nm->sm->vlib_main,
 438                                  nm->nat64_expire_walk_node_index,
 439                                  NAT64_CLEANER_RESCHEDULE, 0);
 440
 441     }
 442   else
 443     {
 444       if (!interface)
 445         return VNET_API_ERROR_NO_SUCH_ENTRY;
 446
 447       if ((nat_interface_is_inside (interface)
 448            && nat_interface_is_outside (interface)))
 449         interface->flags &=
 450           is_inside ? ~NAT_INTERFACE_FLAG_IS_INSIDE :
 451           ~NAT_INTERFACE_FLAG_IS_OUTSIDE;
 452       else
 453         pool_put (nm->interfaces, interface);
 454
 455       nm->total_enabled_count--;
 456     }
 457
 458   if (!is_inside)
 459     {
 460       /* *INDENT-OFF* */
 461       vec_foreach (ap, nm->addr_pool)
 462         snat_add_del_addr_to_fib(&ap->addr, 32, sw_if_index, is_add);
 463       /* *INDENT-ON* */
 464     }
 465
 466   if (nm->sm->num_workers > 1)
 467     {
 468       feature_name =
 469         is_inside ? "nat64-in2out-handoff" : "nat64-out2in-handoff";
 470       if (nm->fq_in2out_index == ~0)
 471         nm->fq_in2out_index =
 472           vlib_frame_queue_main_init (nat64_in2out_node.index, 0);
 473       if (nm->fq_out2in_index == ~0)
 474         nm->fq_out2in_index =
 475           vlib_frame_queue_main_init (nat64_out2in_node.index, 0);
 476     }
 477   else
 478     feature_name = is_inside ? "nat64-in2out" : "nat64-out2in";
 479
 480   arc_name = is_inside ? "ip6-unicast" : "ip4-unicast";
 481
 482   return vnet_feature_enable_disable (arc_name, feature_name, sw_if_index,
 483                                       is_add, 0, 0);
 484 }
 485
 486 void
 487 nat64_interfaces_walk (nat64_interface_walk_fn_t fn, void *ctx)
 488 {
 489   nat64_main_t *nm = &nat64_main;
 490   snat_interface_t *i = 0;
 491
 492   /* *INDENT-OFF* */
 493   pool_foreach (i, nm->interfaces,
 494   ({
 495     if (fn (i, ctx))
 496       break;
 497   }));
 498   /* *INDENT-ON* */
 499 }
 500
 501 int
 502 nat64_alloc_out_addr_and_port (u32 fib_index, snat_protocol_t proto,
 503                                ip4_address_t * addr, u16 * port,
 504                                u32 thread_index)
 505 {
 506   nat64_main_t *nm = &nat64_main;
 507   snat_main_t *sm = nm->sm;
 508   snat_session_key_t k;
 509   u32 worker_index = 0;
 510   int rv;
 511
 512   k.protocol = proto;
 513
 514   if (sm->num_workers > 1)
 515     worker_index = thread_index - sm->first_worker_index;
 516
 517   rv =
 518     sm->alloc_addr_and_port (nm->addr_pool, fib_index, thread_index, &k,
 519                              sm->port_per_thread, worker_index);
 520
 521   if (!rv)
 522     {
 523       *port = k.port;
 524       addr->as_u32 = k.addr.as_u32;
 525     }
 526
 527   return rv;
 528 }
 529
 530 static void
 531 nat64_free_out_addr_and_port (struct nat64_db_s *db, ip4_address_t * addr,
 532                               u16 port, u8 protocol)
 533 {
 534   nat64_main_t *nm = &nat64_main;
 535   int i;
 536   snat_address_t *a;
 537   u32 thread_index = db - nm->db;
 538   snat_protocol_t proto = ip_proto_to_snat_proto (protocol);
 539   u16 port_host_byte_order = clib_net_to_host_u16 (port);
 540
 541   for (i = 0; i < vec_len (nm->addr_pool); i++)
 542     {
 543       a = nm->addr_pool + i;
 544       if (addr->as_u32 != a->addr.as_u32)
 545         continue;
 546       switch (proto)
 547         {
 548 #define _(N, j, n, s) \
 549         case SNAT_PROTOCOL_##N: \
 550           ASSERT (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, \
 551                   port_host_byte_order) == 1); \
 552           clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, port, 0); \
 553           a->busy_##n##_ports--; \
 554           a->busy_##n##_ports_per_thread[thread_index]--; \
 555           break;
 556           foreach_snat_protocol
 557 #undef _
 558         default:
 559           nat_log_notice ("unknown protocol");
 560           return;
 561         }
 562       break;
 563     }
 564 }
 565
 566 /**
 567  * @brief Add/delete static BIB entry in worker thread.
 568  */
 569 static uword
 570 nat64_static_bib_worker_fn (vlib_main_t * vm, vlib_node_runtime_t * rt,
 571                             vlib_frame_t * f)
 572 {
 573   nat64_main_t *nm = &nat64_main;
 574   u32 thread_index = vm->thread_index;
 575   nat64_db_t *db = &nm->db[thread_index];
 576   nat64_static_bib_to_update_t *static_bib;
 577   nat64_db_bib_entry_t *bibe;
 578   ip46_address_t addr;
 579
 580   /* *INDENT-OFF* */
 581   pool_foreach (static_bib, nm->static_bibs,
 582   ({
 583     if ((static_bib->thread_index != thread_index) || (static_bib->done))
 584       continue;
 585
 586     if (static_bib->is_add)
 587       (void) nat64_db_bib_entry_create (db, &static_bib->in_addr,
 588                                         &static_bib->out_addr,
 589                                         static_bib->in_port,
 590                                         static_bib->out_port,
 591                                         static_bib->fib_index,
 592                                         static_bib->proto, 1);
 593     else
 594       {
 595         addr.as_u64[0] = static_bib->in_addr.as_u64[0];
 596         addr.as_u64[1] = static_bib->in_addr.as_u64[1];
 597         bibe = nat64_db_bib_entry_find (db, &addr, static_bib->in_port,
 598                                         static_bib->proto,
 599                                         static_bib->fib_index, 1);
 600         if (bibe)
 601           nat64_db_bib_entry_free (db, bibe);
 602       }
 603
 604       static_bib->done = 1;
 605   }));
 606   /* *INDENT-ON* */
 607
 608   return 0;
 609 }
 610
 611 static vlib_node_registration_t nat64_static_bib_worker_node;
 612
 613 /* *INDENT-OFF* */
 614 VLIB_REGISTER_NODE (nat64_static_bib_worker_node, static) = {
 615     .function = nat64_static_bib_worker_fn,
 616     .type = VLIB_NODE_TYPE_INPUT,
 617     .state = VLIB_NODE_STATE_INTERRUPT,
 618     .name = "nat64-static-bib-worker",
 619 };
 620 /* *INDENT-ON* */
 621
 622 int
 623 nat64_add_del_static_bib_entry (ip6_address_t * in_addr,
 624                                 ip4_address_t * out_addr, u16 in_port,
 625                                 u16 out_port, u8 proto, u32 vrf_id, u8 is_add)
 626 {
 627   nat64_main_t *nm = &nat64_main;
 628   nat64_db_bib_entry_t *bibe;
 629   u32 fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, vrf_id,
 630                                                      FIB_SOURCE_PLUGIN_HI);
 631   snat_protocol_t p = ip_proto_to_snat_proto (proto);
 632   ip46_address_t addr;
 633   int i;
 634   snat_address_t *a;
 635   u32 thread_index = 0;
 636   nat64_db_t *db;
 637   nat64_static_bib_to_update_t *static_bib;
 638   vlib_main_t *worker_vm;
 639   u32 *to_be_free = 0, *index;
 640
 641   if (nm->sm->num_workers > 1)
 642     {
 643       thread_index = nat64_get_worker_in2out (in_addr);
 644       db = &nm->db[thread_index];
 645     }
 646   else
 647     db = &nm->db[nm->sm->num_workers];
 648
 649   addr.as_u64[0] = in_addr->as_u64[0];
 650   addr.as_u64[1] = in_addr->as_u64[1];
 651   bibe =
 652     nat64_db_bib_entry_find (db, &addr, clib_host_to_net_u16 (in_port),
 653                              proto, fib_index, 1);
 654
 655   if (is_add)
 656     {
 657       if (bibe)
 658         return VNET_API_ERROR_VALUE_EXIST;
 659
 660       /* outside port must be assigned to same thread as internall address */
 661       if ((out_port > 1024) && (nm->sm->num_workers > 1))
 662         {
 663           if (thread_index != ((out_port - 1024) / nm->sm->port_per_thread))
 664             return VNET_API_ERROR_INVALID_VALUE_2;
 665         }
 666
 667       for (i = 0; i < vec_len (nm->addr_pool); i++)
 668         {
 669           a = nm->addr_pool + i;
 670           if (out_addr->as_u32 != a->addr.as_u32)
 671             continue;
 672           switch (p)
 673             {
 674 #define _(N, j, n, s) \
 675             case SNAT_PROTOCOL_##N: \
 676               if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, \
 677                                             out_port)) \
 678                 return VNET_API_ERROR_INVALID_VALUE; \
 679               clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, \
 680                                         out_port, 1); \
 681               if (out_port > 1024) \
 682                 { \
 683                   a->busy_##n##_ports++; \
 684                   a->busy_##n##_ports_per_thread[thread_index]++; \
 685                 } \
 686               break;
 687               foreach_snat_protocol
 688 #undef _
 689             default:
 690               memset (&addr, 0, sizeof (addr));
 691               addr.ip4.as_u32 = out_addr->as_u32;
 692               if (nat64_db_bib_entry_find (db, &addr, 0, proto, fib_index, 0))
 693                 return VNET_API_ERROR_INVALID_VALUE;
 694             }
 695           break;
 696         }
 697       if (!nm->sm->num_workers)
 698         {
 699           bibe =
 700             nat64_db_bib_entry_create (db, in_addr, out_addr,
 701                                        clib_host_to_net_u16 (in_port),
 702                                        clib_host_to_net_u16 (out_port),
 703                                        fib_index, proto, 1);
 704           if (!bibe)
 705             return VNET_API_ERROR_UNSPECIFIED;
 706         }
 707     }
 708   else
 709     {
 710       if (!bibe)
 711         return VNET_API_ERROR_NO_SUCH_ENTRY;
 712
 713       if (!nm->sm->num_workers)
 714         nat64_db_bib_entry_free (db, bibe);
 715     }
 716
 717   if (nm->sm->num_workers)
 718     {
 719       /* *INDENT-OFF* */
 720       pool_foreach (static_bib, nm->static_bibs,
 721       ({
 722         if (static_bib->done)
 723           vec_add1 (to_be_free, static_bib - nm->static_bibs);
 724       }));
 725       vec_foreach (index, to_be_free)
 726         pool_put_index (nm->static_bibs, index[0]);
 727       /* *INDENT-ON* */
 728       vec_free (to_be_free);
 729       pool_get (nm->static_bibs, static_bib);
 730       static_bib->in_addr.as_u64[0] = in_addr->as_u64[0];
 731       static_bib->in_addr.as_u64[1] = in_addr->as_u64[1];
 732       static_bib->in_port = clib_host_to_net_u16 (in_port);
 733       static_bib->out_addr.as_u32 = out_addr->as_u32;
 734       static_bib->out_port = clib_host_to_net_u16 (out_port);
 735       static_bib->fib_index = fib_index;
 736       static_bib->proto = proto;
 737       static_bib->is_add = is_add;
 738       static_bib->thread_index = thread_index;
 739       static_bib->done = 0;
 740       worker_vm = vlib_mains[thread_index];
 741       if (worker_vm)
 742         vlib_node_set_interrupt_pending (worker_vm,
 743                                          nat64_static_bib_worker_node.index);
 744       else
 745         return VNET_API_ERROR_UNSPECIFIED;
 746     }
 747
 748   return 0;
 749 }
 750
 751 int
 752 nat64_set_udp_timeout (u32 timeout)
 753 {
 754   nat64_main_t *nm = &nat64_main;
 755
 756   if (timeout == 0)
 757     nm->udp_timeout = SNAT_UDP_TIMEOUT;
 758   else
 759     nm->udp_timeout = timeout;
 760
 761   return 0;
 762 }
 763
 764 u32
 765 nat64_get_udp_timeout (void)
 766 {
 767   nat64_main_t *nm = &nat64_main;
 768
 769   return nm->udp_timeout;
 770 }
 771
 772 int
 773 nat64_set_icmp_timeout (u32 timeout)
 774 {
 775   nat64_main_t *nm = &nat64_main;
 776
 777   if (timeout == 0)
 778     nm->icmp_timeout = SNAT_ICMP_TIMEOUT;
 779   else
 780     nm->icmp_timeout = timeout;
 781
 782   return 0;
 783 }
 784
 785 u32
 786 nat64_get_icmp_timeout (void)
 787 {
 788   nat64_main_t *nm = &nat64_main;
 789
 790   return nm->icmp_timeout;
 791 }
 792
 793 int
 794 nat64_set_tcp_timeouts (u32 trans, u32 est)
 795 {
 796   nat64_main_t *nm = &nat64_main;
 797
 798   if (trans == 0)
 799     nm->tcp_trans_timeout = SNAT_TCP_TRANSITORY_TIMEOUT;
 800   else
 801     nm->tcp_trans_timeout = trans;
 802
 803   if (est == 0)
 804     nm->tcp_est_timeout = SNAT_TCP_ESTABLISHED_TIMEOUT;
 805   else
 806     nm->tcp_est_timeout = est;
 807
 808   return 0;
 809 }
 810
 811 u32
 812 nat64_get_tcp_trans_timeout (void)
 813 {
 814   nat64_main_t *nm = &nat64_main;
 815
 816   return nm->tcp_trans_timeout;
 817 }
 818
 819 u32
 820 nat64_get_tcp_est_timeout (void)
 821 {
 822   nat64_main_t *nm = &nat64_main;
 823
 824   return nm->tcp_est_timeout;
 825 }
 826
 827 void
 828 nat64_session_reset_timeout (nat64_db_st_entry_t * ste, vlib_main_t * vm)
 829 {
 830   nat64_main_t *nm = &nat64_main;
 831   u32 now = (u32) vlib_time_now (vm);
 832
 833   switch (ip_proto_to_snat_proto (ste->proto))
 834     {
 835     case SNAT_PROTOCOL_ICMP:
 836       ste->expire = now + nm->icmp_timeout;
 837       return;
 838     case SNAT_PROTOCOL_TCP:
 839       {
 840         switch (ste->tcp_state)
 841           {
 842           case NAT64_TCP_STATE_V4_INIT:
 843           case NAT64_TCP_STATE_V6_INIT:
 844           case NAT64_TCP_STATE_V4_FIN_RCV:
 845           case NAT64_TCP_STATE_V6_FIN_RCV:
 846           case NAT64_TCP_STATE_V6_FIN_V4_FIN_RCV:
 847           case NAT64_TCP_STATE_TRANS:
 848             ste->expire = now + nm->tcp_trans_timeout;
 849             return;
 850           case NAT64_TCP_STATE_ESTABLISHED:
 851             ste->expire = now + nm->tcp_est_timeout;
 852             return;
 853           default:
 854             return;
 855           }
 856       }
 857     case SNAT_PROTOCOL_UDP:
 858       ste->expire = now + nm->udp_timeout;
 859       return;
 860     default:
 861       ste->expire = now + nm->udp_timeout;
 862       return;
 863     }
 864 }
 865
 866 void
 867 nat64_tcp_session_set_state (nat64_db_st_entry_t * ste, tcp_header_t * tcp,
 868                              u8 is_ip6)
 869 {
 870   switch (ste->tcp_state)
 871     {
 872     case NAT64_TCP_STATE_CLOSED:
 873       {
 874         if (tcp->flags & TCP_FLAG_SYN)
 875           {
 876             if (is_ip6)
 877               ste->tcp_state = NAT64_TCP_STATE_V6_INIT;
 878             else
 879               ste->tcp_state = NAT64_TCP_STATE_V4_INIT;
 880           }
 881         return;
 882       }
 883     case NAT64_TCP_STATE_V4_INIT:
 884       {
 885         if (is_ip6 && (tcp->flags & TCP_FLAG_SYN))
 886           ste->tcp_state = NAT64_TCP_STATE_ESTABLISHED;
 887         return;
 888       }
 889     case NAT64_TCP_STATE_V6_INIT:
 890       {
 891         if (!is_ip6 && (tcp->flags & TCP_FLAG_SYN))
 892           ste->tcp_state = NAT64_TCP_STATE_ESTABLISHED;
 893         return;
 894       }
 895     case NAT64_TCP_STATE_ESTABLISHED:
 896       {
 897         if (tcp->flags & TCP_FLAG_FIN)
 898           {
 899             if (is_ip6)
 900               ste->tcp_state = NAT64_TCP_STATE_V6_FIN_RCV;
 901             else
 902               ste->tcp_state = NAT64_TCP_STATE_V4_FIN_RCV;
 903           }
 904         else if (tcp->flags & TCP_FLAG_RST)
 905           {
 906             ste->tcp_state = NAT64_TCP_STATE_TRANS;
 907           }
 908         return;
 909       }
 910     case NAT64_TCP_STATE_V4_FIN_RCV:
 911       {
 912         if (is_ip6 && (tcp->flags & TCP_FLAG_FIN))
 913           ste->tcp_state = NAT64_TCP_STATE_V6_FIN_V4_FIN_RCV;
 914         return;
 915       }
 916     case NAT64_TCP_STATE_V6_FIN_RCV:
 917       {
 918         if (!is_ip6 && (tcp->flags & TCP_FLAG_FIN))
 919           ste->tcp_state = NAT64_TCP_STATE_V6_FIN_V4_FIN_RCV;
 920         return;
 921       }
 922     case NAT64_TCP_STATE_TRANS:
 923       {
 924         if (!(tcp->flags & TCP_FLAG_RST))
 925           ste->tcp_state = NAT64_TCP_STATE_ESTABLISHED;
 926         return;
 927       }
 928     default:
 929       return;
 930     }
 931 }
 932
 933 int
 934 nat64_add_del_prefix (ip6_address_t * prefix, u8 plen, u32 vrf_id, u8 is_add)
 935 {
 936   nat64_main_t *nm = &nat64_main;
 937   nat64_prefix_t *p = 0;
 938   int i;
 939
 940   /* Verify prefix length */
 941   if (plen != 32 && plen != 40 && plen != 48 && plen != 56 && plen != 64
 942       && plen != 96)
 943     return VNET_API_ERROR_INVALID_VALUE;
 944
 945   /* Check if tenant already have prefix */
 946   for (i = 0; i < vec_len (nm->pref64); i++)
 947     {
 948       if (nm->pref64[i].vrf_id == vrf_id)
 949         {
 950           p = nm->pref64 + i;
 951           break;
 952         }
 953     }
 954
 955   if (is_add)
 956     {
 957       if (!p)
 958         {
 959           vec_add2 (nm->pref64, p, 1);
 960           p->fib_index =
 961             fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, vrf_id,
 962                                                FIB_SOURCE_PLUGIN_HI);
 963           p->vrf_id = vrf_id;
 964         }
 965
 966       p->prefix.as_u64[0] = prefix->as_u64[0];
 967       p->prefix.as_u64[1] = prefix->as_u64[1];
 968       p->plen = plen;
 969     }
 970   else
 971     {
 972       if (!p)
 973         return VNET_API_ERROR_NO_SUCH_ENTRY;
 974
 975       vec_del1 (nm->pref64, i);
 976     }
 977
 978   return 0;
 979 }
 980
 981 void
 982 nat64_prefix_walk (nat64_prefix_walk_fn_t fn, void *ctx)
 983 {
 984   nat64_main_t *nm = &nat64_main;
 985   nat64_prefix_t *p = 0;
 986
 987   /* *INDENT-OFF* */
 988   vec_foreach (p, nm->pref64)
 989     {
 990       if (fn (p, ctx))
 991         break;
 992     };
 993   /* *INDENT-ON* */
 994 }
 995
 996 void
 997 nat64_compose_ip6 (ip6_address_t * ip6, ip4_address_t * ip4, u32 fib_index)
 998 {
 999   nat64_main_t *nm = &nat64_main;
1000   nat64_prefix_t *p, *gp = 0, *prefix = 0;
1001
1002   /* *INDENT-OFF* */
1003   vec_foreach (p, nm->pref64)
1004     {
1005       if (p->fib_index == fib_index)
1006         {
1007           prefix = p;
1008           break;
1009         }
1010
1011       if (p->fib_index == 0)
1012         gp = p;
1013     };
1014   /* *INDENT-ON* */
1015
1016   if (!prefix)
1017     prefix = gp;
1018
1019   if (prefix)
1020     {
1021       clib_memcpy (ip6, &p->prefix, sizeof (ip6_address_t));
1022       switch (p->plen)
1023         {
1024         case 32:
1025           ip6->as_u32[1] = ip4->as_u32;
1026           break;
1027         case 40:
1028           ip6->as_u8[5] = ip4->as_u8[0];
1029           ip6->as_u8[6] = ip4->as_u8[1];
1030           ip6->as_u8[7] = ip4->as_u8[2];
1031           ip6->as_u8[9] = ip4->as_u8[3];
1032           break;
1033         case 48:
1034           ip6->as_u8[6] = ip4->as_u8[0];
1035           ip6->as_u8[7] = ip4->as_u8[1];
1036           ip6->as_u8[9] = ip4->as_u8[2];
1037           ip6->as_u8[10] = ip4->as_u8[3];
1038           break;
1039         case 56:
1040           ip6->as_u8[7] = ip4->as_u8[0];
1041           ip6->as_u8[9] = ip4->as_u8[1];
1042           ip6->as_u8[10] = ip4->as_u8[2];
1043           ip6->as_u8[11] = ip4->as_u8[3];
1044           break;
1045         case 64:
1046           ip6->as_u8[9] = ip4->as_u8[0];
1047           ip6->as_u8[10] = ip4->as_u8[1];
1048           ip6->as_u8[11] = ip4->as_u8[2];
1049           ip6->as_u8[12] = ip4->as_u8[3];
1050           break;
1051         case 96:
1052           ip6->as_u32[3] = ip4->as_u32;
1053           break;
1054         default:
1055           nat_log_notice ("invalid prefix length");
1056           break;
1057         }
1058     }
1059   else
1060     {
1061       clib_memcpy (ip6, well_known_prefix, sizeof (ip6_address_t));
1062       ip6->as_u32[3] = ip4->as_u32;
1063     }
1064 }
1065
1066 void
1067 nat64_extract_ip4 (ip6_address_t * ip6, ip4_address_t * ip4, u32 fib_index)
1068 {
1069   nat64_main_t *nm = &nat64_main;
1070   nat64_prefix_t *p, *gp = 0;
1071   u8 plen = 0;
1072
1073   /* *INDENT-OFF* */
1074   vec_foreach (p, nm->pref64)
1075     {
1076       if (p->fib_index == fib_index)
1077         {
1078           plen = p->plen;
1079           break;
1080         }
1081
1082       if (p->vrf_id == 0)
1083         gp = p;
1084     };
1085   /* *INDENT-ON* */
1086
1087   if (!plen)
1088     {
1089       if (gp)
1090         plen = gp->plen;
1091       else
1092         plen = 96;
1093     }
1094
1095   switch (plen)
1096     {
1097     case 32:
1098       ip4->as_u32 = ip6->as_u32[1];
1099       break;
1100     case 40:
1101       ip4->as_u8[0] = ip6->as_u8[5];
1102       ip4->as_u8[1] = ip6->as_u8[6];
1103       ip4->as_u8[2] = ip6->as_u8[7];
1104       ip4->as_u8[3] = ip6->as_u8[9];
1105       break;
1106     case 48:
1107       ip4->as_u8[0] = ip6->as_u8[6];
1108       ip4->as_u8[1] = ip6->as_u8[7];
1109       ip4->as_u8[2] = ip6->as_u8[9];
1110       ip4->as_u8[3] = ip6->as_u8[10];
1111       break;
1112     case 56:
1113       ip4->as_u8[0] = ip6->as_u8[7];
1114       ip4->as_u8[1] = ip6->as_u8[9];
1115       ip4->as_u8[2] = ip6->as_u8[10];
1116       ip4->as_u8[3] = ip6->as_u8[11];
1117       break;
1118     case 64:
1119       ip4->as_u8[0] = ip6->as_u8[9];
1120       ip4->as_u8[1] = ip6->as_u8[10];
1121       ip4->as_u8[2] = ip6->as_u8[11];
1122       ip4->as_u8[3] = ip6->as_u8[12];
1123       break;
1124     case 96:
1125       ip4->as_u32 = ip6->as_u32[3];
1126       break;
1127     default:
1128       nat_log_notice ("invalid prefix length");
1129       break;
1130     }
1131 }
1132
1133 /**
1134  * @brief Per worker process checking expire time for NAT64 sessions.
1135  */
1136 static uword
1137 nat64_expire_worker_walk_fn (vlib_main_t * vm, vlib_node_runtime_t * rt,
1138                              vlib_frame_t * f)
1139 {
1140   nat64_main_t *nm = &nat64_main;
1141   u32 thread_index = vm->thread_index;
1142   nat64_db_t *db = &nm->db[thread_index];
1143   u32 now = (u32) vlib_time_now (vm);
1144
1145   nad64_db_st_free_expired (db, now);
1146
1147   return 0;
1148 }
1149
1150 static vlib_node_registration_t nat64_expire_worker_walk_node;
1151
1152 /* *INDENT-OFF* */
1153 VLIB_REGISTER_NODE (nat64_expire_worker_walk_node, static) = {
1154     .function = nat64_expire_worker_walk_fn,
1155     .type = VLIB_NODE_TYPE_INPUT,
1156     .state = VLIB_NODE_STATE_INTERRUPT,
1157     .name = "nat64-expire-worker-walk",
1158 };
1159 /* *INDENT-ON* */
1160
1161 static vlib_node_registration_t nat64_expire_walk_node;
1162
1163 /**
1164  * @brief Centralized process to drive per worker expire walk.
1165  */
1166 static uword
1167 nat64_expire_walk_fn (vlib_main_t * vm, vlib_node_runtime_t * rt,
1168                       vlib_frame_t * f)
1169 {
1170   nat64_main_t *nm = &nat64_main;
1171   vlib_main_t **worker_vms = 0, *worker_vm;
1172   int i;
1173   uword event_type, *event_data = 0;
1174
1175   nm->nat64_expire_walk_node_index = nat64_expire_walk_node.index;
1176
1177   if (vec_len (vlib_mains) == 0)
1178     vec_add1 (worker_vms, vm);
1179   else
1180     {
1181       for (i = 0; i < vec_len (vlib_mains); i++)
1182         {
1183           worker_vm = vlib_mains[i];
1184           if (worker_vm)
1185             vec_add1 (worker_vms, worker_vm);
1186         }
1187     }
1188
1189   while (1)
1190     {
1191       if (nm->total_enabled_count)
1192         {
1193           vlib_process_wait_for_event_or_clock (vm, 10.0);
1194           event_type = vlib_process_get_events (vm, &event_data);
1195         }
1196       else
1197         {
1198           vlib_process_wait_for_event (vm);
1199           event_type = vlib_process_get_events (vm, &event_data);
1200         }
1201
1202       switch (event_type)
1203         {
1204         case ~0:
1205           break;
1206         case NAT64_CLEANER_RESCHEDULE:
1207           break;
1208         default:
1209           nat_log_notice ("unknown event %u", event_type);
1210           break;
1211         }
1212
1213       for (i = 0; i < vec_len (worker_vms); i++)
1214         {
1215           worker_vm = worker_vms[i];
1216           vlib_node_set_interrupt_pending (worker_vm,
1217                                            nat64_expire_worker_walk_node.index);
1218         }
1219     }
1220
1221   return 0;
1222 }
1223
1224 /* *INDENT-OFF* */
1225 VLIB_REGISTER_NODE (nat64_expire_walk_node, static) = {
1226     .function = nat64_expire_walk_fn,
1227     .type = VLIB_NODE_TYPE_PROCESS,
1228     .name = "nat64-expire-walk",
1229 };
1230 /* *INDENT-ON* */
1231
1232 /*
1233  * fd.io coding-style-patch-verification: ON
1234  *
1235  * Local Variables:
1236  * eval: (c-set-style "gnu")
1237  * End:
1238  */