src/plugins/nat/nat.c

   1 /*
   2  * snat.c - simple nat plugin
   3  *
   4  * Copyright (c) 2016 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/ip/ip.h>
  20 #include <vnet/ip/ip4.h>
  21 #include <vnet/plugin/plugin.h>
  22 #include <nat/nat.h>
  23 #include <nat/nat_dpo.h>
  24 #include <nat/nat_ipfix_logging.h>
  25 #include <nat/nat_det.h>
  26 #include <nat/nat64.h>
  27 #include <nat/nat66.h>
  28 #include <nat/dslite.h>
  29 #include <nat/nat_reass.h>
  30 #include <nat/nat_inlines.h>
  31 #include <nat/nat_affinity.h>
  32 #include <nat/nat_syslog.h>
  33 #include <nat/nat_ha.h>
  34 #include <vnet/fib/fib_table.h>
  35 #include <vnet/fib/ip4_fib.h>
  36
  37 #include <vpp/app/version.h>
  38
  39 snat_main_t snat_main;
  40
  41 /* *INDENT-OFF* */
  42
  43 /* Hook up input features */
  44 VNET_FEATURE_INIT (ip4_snat_in2out, static) = {
  45   .arc_name = "ip4-unicast",
  46   .node_name = "nat44-in2out",
  47   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
  48 };
  49 VNET_FEATURE_INIT (ip4_snat_out2in, static) = {
  50   .arc_name = "ip4-unicast",
  51   .node_name = "nat44-out2in",
  52   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
  53                                "ip4-dhcp-client-detect"),
  54 };
  55 VNET_FEATURE_INIT (ip4_nat_classify, static) = {
  56   .arc_name = "ip4-unicast",
  57   .node_name = "nat44-classify",
  58   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
  59 };
  60 VNET_FEATURE_INIT (ip4_snat_det_in2out, static) = {
  61   .arc_name = "ip4-unicast",
  62   .node_name = "nat44-det-in2out",
  63   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
  64 };
  65 VNET_FEATURE_INIT (ip4_snat_det_out2in, static) = {
  66   .arc_name = "ip4-unicast",
  67   .node_name = "nat44-det-out2in",
  68   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
  69                                "ip4-dhcp-client-detect"),
  70 };
  71 VNET_FEATURE_INIT (ip4_nat_det_classify, static) = {
  72   .arc_name = "ip4-unicast",
  73   .node_name = "nat44-det-classify",
  74   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
  75 };
  76 VNET_FEATURE_INIT (ip4_nat44_ed_in2out, static) = {
  77   .arc_name = "ip4-unicast",
  78   .node_name = "nat44-ed-in2out",
  79   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
  80 };
  81 VNET_FEATURE_INIT (ip4_nat44_ed_out2in, static) = {
  82   .arc_name = "ip4-unicast",
  83   .node_name = "nat44-ed-out2in",
  84   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
  85                                "ip4-dhcp-client-detect"),
  86 };
  87 VNET_FEATURE_INIT (ip4_nat44_ed_classify, static) = {
  88   .arc_name = "ip4-unicast",
  89   .node_name = "nat44-ed-classify",
  90   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
  91 };
  92 VNET_FEATURE_INIT (ip4_snat_in2out_worker_handoff, static) = {
  93   .arc_name = "ip4-unicast",
  94   .node_name = "nat44-in2out-worker-handoff",
  95   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
  96 };
  97 VNET_FEATURE_INIT (ip4_snat_out2in_worker_handoff, static) = {
  98   .arc_name = "ip4-unicast",
  99   .node_name = "nat44-out2in-worker-handoff",
 100   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
 101                                "ip4-dhcp-client-detect"),
 102 };
 103 VNET_FEATURE_INIT (ip4_nat_handoff_classify, static) = {
 104   .arc_name = "ip4-unicast",
 105   .node_name = "nat44-handoff-classify",
 106   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
 107 };
 108 VNET_FEATURE_INIT (ip4_snat_in2out_fast, static) = {
 109   .arc_name = "ip4-unicast",
 110   .node_name = "nat44-in2out-fast",
 111   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
 112 };
 113 VNET_FEATURE_INIT (ip4_snat_out2in_fast, static) = {
 114   .arc_name = "ip4-unicast",
 115   .node_name = "nat44-out2in-fast",
 116   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
 117                                "ip4-dhcp-client-detect"),
 118 };
 119 VNET_FEATURE_INIT (ip4_snat_hairpin_dst, static) = {
 120   .arc_name = "ip4-unicast",
 121   .node_name = "nat44-hairpin-dst",
 122   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
 123 };
 124 VNET_FEATURE_INIT (ip4_nat44_ed_hairpin_dst, static) = {
 125   .arc_name = "ip4-unicast",
 126   .node_name = "nat44-ed-hairpin-dst",
 127   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
 128 };
 129
 130 /* Hook up output features */
 131 VNET_FEATURE_INIT (ip4_snat_in2out_output, static) = {
 132   .arc_name = "ip4-output",
 133   .node_name = "nat44-in2out-output",
 134   .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa"),
 135 };
 136 VNET_FEATURE_INIT (ip4_snat_in2out_output_worker_handoff, static) = {
 137   .arc_name = "ip4-output",
 138   .node_name = "nat44-in2out-output-worker-handoff",
 139   .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa"),
 140 };
 141 VNET_FEATURE_INIT (ip4_snat_hairpin_src, static) = {
 142   .arc_name = "ip4-output",
 143   .node_name = "nat44-hairpin-src",
 144   .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa"),
 145 };
 146 VNET_FEATURE_INIT (ip4_nat44_ed_in2out_output, static) = {
 147   .arc_name = "ip4-output",
 148   .node_name = "nat44-ed-in2out-output",
 149   .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa"),
 150 };
 151 VNET_FEATURE_INIT (ip4_nat44_ed_hairpin_src, static) = {
 152   .arc_name = "ip4-output",
 153   .node_name = "nat44-ed-hairpin-src",
 154   .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa"),
 155 };
 156
 157 /* Hook up ip4-local features */
 158 VNET_FEATURE_INIT (ip4_nat_hairpinning, static) =
 159 {
 160   .arc_name = "ip4-local",
 161   .node_name = "nat44-hairpinning",
 162   .runs_before = VNET_FEATURES("ip4-local-end-of-arc"),
 163 };
 164 VNET_FEATURE_INIT (ip4_nat44_ed_hairpinning, static) =
 165 {
 166   .arc_name = "ip4-local",
 167   .node_name = "nat44-ed-hairpinning",
 168   .runs_before = VNET_FEATURES("ip4-local-end-of-arc"),
 169 };
 170
 171
 172 VLIB_PLUGIN_REGISTER () = {
 173     .version = VPP_BUILD_VER,
 174     .description = "Network Address Translation (NAT)",
 175 };
 176 /* *INDENT-ON* */
 177
 178 void
 179 nat_free_session_data (snat_main_t * sm, snat_session_t * s, u32 thread_index,
 180                        u8 is_ha)
 181 {
 182   snat_session_key_t key;
 183   clib_bihash_kv_8_8_t kv;
 184   nat_ed_ses_key_t ed_key;
 185   clib_bihash_kv_16_8_t ed_kv;
 186   snat_main_per_thread_data_t *tsm =
 187     vec_elt_at_index (sm->per_thread_data, thread_index);
 188
 189   if (is_fwd_bypass_session (s))
 190     {
 191       if (snat_is_unk_proto_session (s))
 192         {
 193           ed_key.proto = s->in2out.port;
 194           ed_key.r_port = 0;
 195           ed_key.l_port = 0;
 196         }
 197       else
 198         {
 199           ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol);
 200           ed_key.l_port = s->in2out.port;
 201           ed_key.r_port = s->ext_host_port;
 202         }
 203       ed_key.l_addr = s->in2out.addr;
 204       ed_key.r_addr = s->ext_host_addr;
 205       ed_key.fib_index = 0;
 206       ed_kv.key[0] = ed_key.as_u64[0];
 207       ed_kv.key[1] = ed_key.as_u64[1];
 208       if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &ed_kv, 0))
 209         nat_elog_warn ("in2out_ed key del failed");
 210       return;
 211     }
 212
 213   /* session lookup tables */
 214   if (is_ed_session (s))
 215     {
 216       if (is_affinity_sessions (s))
 217         nat_affinity_unlock (s->ext_host_addr, s->out2in.addr,
 218                              s->in2out.protocol, s->out2in.port);
 219       ed_key.l_addr = s->out2in.addr;
 220       ed_key.r_addr = s->ext_host_addr;
 221       ed_key.fib_index = s->out2in.fib_index;
 222       if (snat_is_unk_proto_session (s))
 223         {
 224           ed_key.proto = s->in2out.port;
 225           ed_key.r_port = 0;
 226           ed_key.l_port = 0;
 227         }
 228       else
 229         {
 230           ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol);
 231           ed_key.l_port = s->out2in.port;
 232           ed_key.r_port = s->ext_host_port;
 233         }
 234       ed_kv.key[0] = ed_key.as_u64[0];
 235       ed_kv.key[1] = ed_key.as_u64[1];
 236       if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &ed_kv, 0))
 237         nat_elog_warn ("out2in_ed key del failed");
 238       ed_key.l_addr = s->in2out.addr;
 239       ed_key.fib_index = s->in2out.fib_index;
 240       if (!snat_is_unk_proto_session (s))
 241         ed_key.l_port = s->in2out.port;
 242       if (is_twice_nat_session (s))
 243         {
 244           ed_key.r_addr = s->ext_host_nat_addr;
 245           ed_key.r_port = s->ext_host_nat_port;
 246         }
 247       ed_kv.key[0] = ed_key.as_u64[0];
 248       ed_kv.key[1] = ed_key.as_u64[1];
 249       if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &ed_kv, 0))
 250         nat_elog_warn ("in2out_ed key del failed");
 251
 252       if (!is_ha)
 253         nat_syslog_nat44_sdel (s->user_index, s->in2out.fib_index,
 254                                &s->in2out.addr, s->in2out.port,
 255                                &s->ext_host_nat_addr, s->ext_host_nat_port,
 256                                &s->out2in.addr, s->out2in.port,
 257                                &s->ext_host_addr, s->ext_host_port,
 258                                s->in2out.protocol, is_twice_nat_session (s));
 259     }
 260   else
 261     {
 262       kv.key = s->in2out.as_u64;
 263       if (clib_bihash_add_del_8_8 (&tsm->in2out, &kv, 0))
 264         nat_elog_warn ("in2out key del failed");
 265       kv.key = s->out2in.as_u64;
 266       if (clib_bihash_add_del_8_8 (&tsm->out2in, &kv, 0))
 267         nat_elog_warn ("out2in key del failed");
 268
 269       if (!is_ha)
 270         nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
 271                                  &s->in2out.addr, s->in2out.port,
 272                                  &s->out2in.addr, s->out2in.port,
 273                                  s->in2out.protocol);
 274     }
 275
 276   if (snat_is_unk_proto_session (s))
 277     return;
 278
 279   if (!is_ha)
 280     {
 281       /* log NAT event */
 282       snat_ipfix_logging_nat44_ses_delete (thread_index,
 283                                            s->in2out.addr.as_u32,
 284                                            s->out2in.addr.as_u32,
 285                                            s->in2out.protocol,
 286                                            s->in2out.port,
 287                                            s->out2in.port,
 288                                            s->in2out.fib_index);
 289
 290       nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
 291                    s->ext_host_port, s->out2in.protocol, s->out2in.fib_index,
 292                    thread_index);
 293     }
 294
 295   /* Twice NAT address and port for external host */
 296   if (is_twice_nat_session (s))
 297     {
 298       key.protocol = s->in2out.protocol;
 299       key.port = s->ext_host_nat_port;
 300       key.addr.as_u32 = s->ext_host_nat_addr.as_u32;
 301       snat_free_outside_address_and_port (sm->twice_nat_addresses,
 302                                           thread_index, &key);
 303     }
 304
 305   if (snat_is_session_static (s))
 306     return;
 307
 308   snat_free_outside_address_and_port (sm->addresses, thread_index,
 309                                       &s->out2in);
 310 }
 311
 312 snat_user_t *
 313 nat_user_get_or_create (snat_main_t * sm, ip4_address_t * addr, u32 fib_index,
 314                         u32 thread_index)
 315 {
 316   snat_user_t *u = 0;
 317   snat_user_key_t user_key;
 318   clib_bihash_kv_8_8_t kv, value;
 319   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 320   dlist_elt_t *per_user_list_head_elt;
 321
 322   user_key.addr.as_u32 = addr->as_u32;
 323   user_key.fib_index = fib_index;
 324   kv.key = user_key.as_u64;
 325
 326   /* Ever heard of the "user" = src ip4 address before? */
 327   if (clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
 328     {
 329       /* no, make a new one */
 330       pool_get (tsm->users, u);
 331       clib_memset (u, 0, sizeof (*u));
 332       u->addr.as_u32 = addr->as_u32;
 333       u->fib_index = fib_index;
 334
 335       pool_get (tsm->list_pool, per_user_list_head_elt);
 336
 337       u->sessions_per_user_list_head_index = per_user_list_head_elt -
 338         tsm->list_pool;
 339
 340       clib_dlist_init (tsm->list_pool, u->sessions_per_user_list_head_index);
 341
 342       kv.value = u - tsm->users;
 343
 344       /* add user */
 345       if (clib_bihash_add_del_8_8 (&tsm->user_hash, &kv, 1))
 346         nat_elog_warn ("user_hash keay add failed");
 347
 348       vlib_set_simple_counter (&sm->total_users, thread_index, 0,
 349                                pool_elts (tsm->users));
 350     }
 351   else
 352     {
 353       u = pool_elt_at_index (tsm->users, value.value);
 354     }
 355
 356   return u;
 357 }
 358
 359 snat_session_t *
 360 nat_session_alloc_or_recycle (snat_main_t * sm, snat_user_t * u,
 361                               u32 thread_index, f64 now)
 362 {
 363   snat_session_t *s;
 364   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 365   u32 oldest_per_user_translation_list_index, session_index;
 366   dlist_elt_t *oldest_per_user_translation_list_elt;
 367   dlist_elt_t *per_user_translation_list_elt;
 368
 369   /* Over quota? Recycle the least recently used translation */
 370   if ((u->nsessions + u->nstaticsessions) >= sm->max_translations_per_user)
 371     {
 372       oldest_per_user_translation_list_index =
 373         clib_dlist_remove_head (tsm->list_pool,
 374                                 u->sessions_per_user_list_head_index);
 375
 376       ASSERT (oldest_per_user_translation_list_index != ~0);
 377
 378       /* Add it back to the end of the LRU list */
 379       clib_dlist_addtail (tsm->list_pool,
 380                           u->sessions_per_user_list_head_index,
 381                           oldest_per_user_translation_list_index);
 382       /* Get the list element */
 383       oldest_per_user_translation_list_elt =
 384         pool_elt_at_index (tsm->list_pool,
 385                            oldest_per_user_translation_list_index);
 386
 387       /* Get the session index from the list element */
 388       session_index = oldest_per_user_translation_list_elt->value;
 389
 390       /* Get the session */
 391       s = pool_elt_at_index (tsm->sessions, session_index);
 392       nat_free_session_data (sm, s, thread_index, 0);
 393       if (snat_is_session_static (s))
 394         u->nstaticsessions--;
 395       else
 396         u->nsessions--;
 397       s->flags = 0;
 398       s->total_bytes = 0;
 399       s->total_pkts = 0;
 400       s->state = 0;
 401       s->ext_host_addr.as_u32 = 0;
 402       s->ext_host_port = 0;
 403       s->ext_host_nat_addr.as_u32 = 0;
 404       s->ext_host_nat_port = 0;
 405     }
 406   else
 407     {
 408       pool_get (tsm->sessions, s);
 409       clib_memset (s, 0, sizeof (*s));
 410
 411       /* Create list elts */
 412       pool_get (tsm->list_pool, per_user_translation_list_elt);
 413       clib_dlist_init (tsm->list_pool,
 414                        per_user_translation_list_elt - tsm->list_pool);
 415
 416       per_user_translation_list_elt->value = s - tsm->sessions;
 417       s->per_user_index = per_user_translation_list_elt - tsm->list_pool;
 418       s->per_user_list_head_index = u->sessions_per_user_list_head_index;
 419
 420       clib_dlist_addtail (tsm->list_pool,
 421                           s->per_user_list_head_index,
 422                           per_user_translation_list_elt - tsm->list_pool);
 423
 424       s->user_index = u - tsm->users;
 425       vlib_set_simple_counter (&sm->total_sessions, thread_index, 0,
 426                                pool_elts (tsm->sessions));
 427     }
 428
 429   s->ha_last_refreshed = now;
 430
 431   return s;
 432 }
 433
 434 snat_session_t *
 435 nat_ed_session_alloc (snat_main_t * sm, snat_user_t * u, u32 thread_index,
 436                       f64 now)
 437 {
 438   snat_session_t *s;
 439   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 440   dlist_elt_t *per_user_translation_list_elt, *oldest_elt;
 441   u32 oldest_index;
 442   u64 sess_timeout_time;
 443
 444   if (PREDICT_FALSE (!(u->nsessions) && !(u->nstaticsessions)))
 445     goto alloc_new;
 446
 447   oldest_index =
 448     clib_dlist_remove_head (tsm->list_pool,
 449                             u->sessions_per_user_list_head_index);
 450   oldest_elt = pool_elt_at_index (tsm->list_pool, oldest_index);
 451   s = pool_elt_at_index (tsm->sessions, oldest_elt->value);
 452   sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
 453   if (now >= sess_timeout_time)
 454     {
 455       clib_dlist_addtail (tsm->list_pool,
 456                           u->sessions_per_user_list_head_index, oldest_index);
 457       nat_free_session_data (sm, s, thread_index, 0);
 458       if (snat_is_session_static (s))
 459         u->nstaticsessions--;
 460       else
 461         u->nsessions--;
 462       s->flags = 0;
 463       s->total_bytes = 0;
 464       s->total_pkts = 0;
 465       s->state = 0;
 466       s->ext_host_addr.as_u32 = 0;
 467       s->ext_host_port = 0;
 468       s->ext_host_nat_addr.as_u32 = 0;
 469       s->ext_host_nat_port = 0;
 470     }
 471   else
 472     {
 473       clib_dlist_addhead (tsm->list_pool,
 474                           u->sessions_per_user_list_head_index, oldest_index);
 475       if ((u->nsessions + u->nstaticsessions) >=
 476           sm->max_translations_per_user)
 477         {
 478           nat_elog_addr (SNAT_LOG_WARNING, "[warn] max translations per user",
 479                          clib_net_to_host_u32 (u->addr.as_u32));
 480           snat_ipfix_logging_max_entries_per_user
 481             (thread_index, sm->max_translations_per_user, u->addr.as_u32);
 482           return 0;
 483         }
 484       else
 485         {
 486         alloc_new:
 487           pool_get (tsm->sessions, s);
 488           clib_memset (s, 0, sizeof (*s));
 489
 490           /* Create list elts */
 491           pool_get (tsm->list_pool, per_user_translation_list_elt);
 492           clib_dlist_init (tsm->list_pool,
 493                            per_user_translation_list_elt - tsm->list_pool);
 494
 495           per_user_translation_list_elt->value = s - tsm->sessions;
 496           s->per_user_index = per_user_translation_list_elt - tsm->list_pool;
 497           s->per_user_list_head_index = u->sessions_per_user_list_head_index;
 498
 499           clib_dlist_addtail (tsm->list_pool,
 500                               s->per_user_list_head_index,
 501                               per_user_translation_list_elt - tsm->list_pool);
 502         }
 503
 504       vlib_set_simple_counter (&sm->total_sessions, thread_index, 0,
 505                                pool_elts (tsm->sessions));
 506     }
 507
 508   s->ha_last_refreshed = now;
 509
 510   return s;
 511 }
 512
 513 void
 514 snat_add_del_addr_to_fib (ip4_address_t * addr, u8 p_len, u32 sw_if_index,
 515                           int is_add)
 516 {
 517   fib_prefix_t prefix = {
 518     .fp_len = p_len,
 519     .fp_proto = FIB_PROTOCOL_IP4,
 520     .fp_addr = {
 521                 .ip4.as_u32 = addr->as_u32,
 522                 },
 523   };
 524   u32 fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
 525
 526   if (is_add)
 527     fib_table_entry_update_one_path (fib_index,
 528                                      &prefix,
 529                                      FIB_SOURCE_PLUGIN_LOW,
 530                                      (FIB_ENTRY_FLAG_CONNECTED |
 531                                       FIB_ENTRY_FLAG_LOCAL |
 532                                       FIB_ENTRY_FLAG_EXCLUSIVE),
 533                                      DPO_PROTO_IP4,
 534                                      NULL,
 535                                      sw_if_index,
 536                                      ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
 537   else
 538     fib_table_entry_delete (fib_index, &prefix, FIB_SOURCE_PLUGIN_LOW);
 539 }
 540
 541 int
 542 snat_add_address (snat_main_t * sm, ip4_address_t * addr, u32 vrf_id,
 543                   u8 twice_nat)
 544 {
 545   snat_address_t *ap;
 546   snat_interface_t *i;
 547   vlib_thread_main_t *tm = vlib_get_thread_main ();
 548
 549   if (twice_nat && !sm->endpoint_dependent)
 550     return VNET_API_ERROR_FEATURE_DISABLED;
 551
 552   /* Check if address already exists */
 553   /* *INDENT-OFF* */
 554   vec_foreach (ap, twice_nat ? sm->twice_nat_addresses : sm->addresses)
 555     {
 556       if (ap->addr.as_u32 == addr->as_u32)
 557         return VNET_API_ERROR_VALUE_EXIST;
 558     }
 559   /* *INDENT-ON* */
 560
 561   if (twice_nat)
 562     vec_add2 (sm->twice_nat_addresses, ap, 1);
 563   else
 564     vec_add2 (sm->addresses, ap, 1);
 565
 566   ap->addr = *addr;
 567   if (vrf_id != ~0)
 568     ap->fib_index =
 569       fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id,
 570                                          FIB_SOURCE_PLUGIN_LOW);
 571   else
 572     ap->fib_index = ~0;
 573 #define _(N, i, n, s) \
 574   clib_bitmap_alloc (ap->busy_##n##_port_bitmap, 65535); \
 575   ap->busy_##n##_ports = 0; \
 576   ap->busy_##n##_ports_per_thread = 0;\
 577   vec_validate_init_empty (ap->busy_##n##_ports_per_thread, tm->n_vlib_mains - 1, 0);
 578   foreach_snat_protocol
 579 #undef _
 580     if (twice_nat)
 581     return 0;
 582
 583   /* Add external address to FIB */
 584   /* *INDENT-OFF* */
 585   pool_foreach (i, sm->interfaces,
 586   ({
 587     if (nat_interface_is_inside(i) || sm->out2in_dpo)
 588       continue;
 589
 590     snat_add_del_addr_to_fib(addr, 32, i->sw_if_index, 1);
 591     break;
 592   }));
 593   pool_foreach (i, sm->output_feature_interfaces,
 594   ({
 595     if (nat_interface_is_inside(i) || sm->out2in_dpo)
 596       continue;
 597
 598     snat_add_del_addr_to_fib(addr, 32, i->sw_if_index, 1);
 599     break;
 600   }));
 601   /* *INDENT-ON* */
 602
 603   return 0;
 604 }
 605
 606 static int
 607 is_snat_address_used_in_static_mapping (snat_main_t * sm, ip4_address_t addr)
 608 {
 609   snat_static_mapping_t *m;
 610   /* *INDENT-OFF* */
 611   pool_foreach (m, sm->static_mappings,
 612   ({
 613       if (is_addr_only_static_mapping (m) ||
 614           is_out2in_only_static_mapping (m) ||
 615           is_identity_static_mapping (m))
 616         continue;
 617       if (m->external_addr.as_u32 == addr.as_u32)
 618         return 1;
 619   }));
 620   /* *INDENT-ON* */
 621
 622   return 0;
 623 }
 624
 625 void
 626 increment_v4_address (ip4_address_t * a)
 627 {
 628   u32 v;
 629
 630   v = clib_net_to_host_u32 (a->as_u32) + 1;
 631   a->as_u32 = clib_host_to_net_u32 (v);
 632 }
 633
 634 static void
 635 snat_add_static_mapping_when_resolved (snat_main_t * sm,
 636                                        ip4_address_t l_addr,
 637                                        u16 l_port,
 638                                        u32 sw_if_index,
 639                                        u16 e_port,
 640                                        u32 vrf_id,
 641                                        snat_protocol_t proto,
 642                                        int addr_only, int is_add, u8 * tag,
 643                                        int twice_nat, int out2in_only,
 644                                        int identity_nat)
 645 {
 646   snat_static_map_resolve_t *rp;
 647
 648   vec_add2 (sm->to_resolve, rp, 1);
 649   rp->l_addr.as_u32 = l_addr.as_u32;
 650   rp->l_port = l_port;
 651   rp->sw_if_index = sw_if_index;
 652   rp->e_port = e_port;
 653   rp->vrf_id = vrf_id;
 654   rp->proto = proto;
 655   rp->addr_only = addr_only;
 656   rp->is_add = is_add;
 657   rp->twice_nat = twice_nat;
 658   rp->out2in_only = out2in_only;
 659   rp->identity_nat = identity_nat;
 660   rp->tag = vec_dup (tag);
 661 }
 662
 663 static u32
 664 get_thread_idx_by_port (u16 e_port)
 665 {
 666   snat_main_t *sm = &snat_main;
 667   u32 thread_idx = sm->num_workers;
 668   if (sm->num_workers > 1)
 669     {
 670       thread_idx =
 671         sm->first_worker_index +
 672         sm->workers[(e_port - 1024) / sm->port_per_thread];
 673     }
 674   return thread_idx;
 675 }
 676
 677 int
 678 snat_add_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
 679                          u16 l_port, u16 e_port, u32 vrf_id, int addr_only,
 680                          u32 sw_if_index, snat_protocol_t proto, int is_add,
 681                          twice_nat_type_t twice_nat, u8 out2in_only, u8 * tag,
 682                          u8 identity_nat)
 683 {
 684   snat_main_t *sm = &snat_main;
 685   snat_static_mapping_t *m;
 686   snat_session_key_t m_key;
 687   clib_bihash_kv_8_8_t kv, value;
 688   snat_address_t *a = 0;
 689   u32 fib_index = ~0;
 690   snat_interface_t *interface;
 691   int i;
 692   snat_main_per_thread_data_t *tsm;
 693   snat_user_key_t u_key;
 694   snat_user_t *u;
 695   dlist_elt_t *head, *elt;
 696   u32 elt_index, head_index;
 697   u32 ses_index;
 698   u64 user_index;
 699   snat_session_t *s;
 700   snat_static_map_resolve_t *rp, *rp_match = 0;
 701   nat44_lb_addr_port_t *local;
 702   u32 find = ~0;
 703
 704   if (!sm->endpoint_dependent)
 705     {
 706       if (twice_nat || out2in_only)
 707         return VNET_API_ERROR_FEATURE_DISABLED;
 708     }
 709
 710   /* If the external address is a specific interface address */
 711   if (sw_if_index != ~0)
 712     {
 713       ip4_address_t *first_int_addr;
 714
 715       for (i = 0; i < vec_len (sm->to_resolve); i++)
 716         {
 717           rp = sm->to_resolve + i;
 718           if (rp->sw_if_index != sw_if_index ||
 719               rp->l_addr.as_u32 != l_addr.as_u32 ||
 720               rp->vrf_id != vrf_id || rp->addr_only != addr_only)
 721             continue;
 722
 723           if (!addr_only)
 724             {
 725               if ((rp->l_port != l_port && rp->e_port != e_port)
 726                   || rp->proto != proto)
 727                 continue;
 728             }
 729
 730           rp_match = rp;
 731           break;
 732         }
 733
 734       /* Might be already set... */
 735       first_int_addr = ip4_interface_first_address
 736         (sm->ip4_main, sw_if_index, 0 /* just want the address */ );
 737
 738       if (is_add)
 739         {
 740           if (rp_match)
 741             return VNET_API_ERROR_VALUE_EXIST;
 742
 743           snat_add_static_mapping_when_resolved
 744             (sm, l_addr, l_port, sw_if_index, e_port, vrf_id, proto,
 745              addr_only, is_add, tag, twice_nat, out2in_only, identity_nat);
 746
 747           /* DHCP resolution required? */
 748           if (first_int_addr == 0)
 749             {
 750               return 0;
 751             }
 752           else
 753             {
 754               e_addr.as_u32 = first_int_addr->as_u32;
 755               /* Identity mapping? */
 756               if (l_addr.as_u32 == 0)
 757                 l_addr.as_u32 = e_addr.as_u32;
 758             }
 759         }
 760       else
 761         {
 762           if (!rp_match)
 763             return VNET_API_ERROR_NO_SUCH_ENTRY;
 764
 765           vec_del1 (sm->to_resolve, i);
 766
 767           if (first_int_addr)
 768             {
 769               e_addr.as_u32 = first_int_addr->as_u32;
 770               /* Identity mapping? */
 771               if (l_addr.as_u32 == 0)
 772                 l_addr.as_u32 = e_addr.as_u32;
 773             }
 774           else
 775             return 0;
 776         }
 777     }
 778
 779   m_key.addr = e_addr;
 780   m_key.port = addr_only ? 0 : e_port;
 781   m_key.protocol = addr_only ? 0 : proto;
 782   m_key.fib_index = 0;
 783   kv.key = m_key.as_u64;
 784   if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
 785     m = 0;
 786   else
 787     m = pool_elt_at_index (sm->static_mappings, value.value);
 788
 789   if (is_add)
 790     {
 791       if (m)
 792         {
 793           if (is_identity_static_mapping (m))
 794             {
 795               /* *INDENT-OFF* */
 796               pool_foreach (local, m->locals,
 797               ({
 798                 if (local->vrf_id == vrf_id)
 799                   return VNET_API_ERROR_VALUE_EXIST;
 800               }));
 801               /* *INDENT-ON* */
 802               pool_get (m->locals, local);
 803               local->vrf_id = vrf_id;
 804               local->fib_index =
 805                 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id,
 806                                                    FIB_SOURCE_PLUGIN_LOW);
 807               m_key.addr = m->local_addr;
 808               m_key.port = m->local_port;
 809               m_key.protocol = m->proto;
 810               m_key.fib_index = local->fib_index;
 811               kv.key = m_key.as_u64;
 812               kv.value = m - sm->static_mappings;
 813               clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1);
 814               return 0;
 815             }
 816           else
 817             return VNET_API_ERROR_VALUE_EXIST;
 818         }
 819
 820       if (twice_nat && addr_only)
 821         return VNET_API_ERROR_UNSUPPORTED;
 822
 823       /* Convert VRF id to FIB index */
 824       if (vrf_id != ~0)
 825         fib_index =
 826           fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id,
 827                                              FIB_SOURCE_PLUGIN_LOW);
 828       /* If not specified use inside VRF id from SNAT plugin startup config */
 829       else
 830         {
 831           fib_index = sm->inside_fib_index;
 832           vrf_id = sm->inside_vrf_id;
 833           fib_table_lock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_PLUGIN_LOW);
 834         }
 835
 836       if (!(out2in_only || identity_nat))
 837         {
 838           m_key.addr = l_addr;
 839           m_key.port = addr_only ? 0 : l_port;
 840           m_key.protocol = addr_only ? 0 : proto;
 841           m_key.fib_index = fib_index;
 842           kv.key = m_key.as_u64;
 843           if (!clib_bihash_search_8_8
 844               (&sm->static_mapping_by_local, &kv, &value))
 845             return VNET_API_ERROR_VALUE_EXIST;
 846         }
 847
 848       /* Find external address in allocated addresses and reserve port for
 849          address and port pair mapping when dynamic translations enabled */
 850       if (!(addr_only || sm->static_mapping_only || out2in_only))
 851         {
 852           for (i = 0; i < vec_len (sm->addresses); i++)
 853             {
 854               if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
 855                 {
 856                   a = sm->addresses + i;
 857                   /* External port must be unused */
 858                   switch (proto)
 859                     {
 860 #define _(N, j, n, s) \
 861                     case SNAT_PROTOCOL_##N: \
 862                       if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, e_port)) \
 863                         return VNET_API_ERROR_INVALID_VALUE; \
 864                       clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, e_port, 1); \
 865                       if (e_port > 1024) \
 866                         { \
 867                           a->busy_##n##_ports++; \
 868                           a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]++; \
 869                         } \
 870                       break;
 871                       foreach_snat_protocol
 872 #undef _
 873                     default:
 874                       nat_elog_info ("unknown protocol");
 875                       return VNET_API_ERROR_INVALID_VALUE_2;
 876                     }
 877                   break;
 878                 }
 879             }
 880           /* External address must be allocated */
 881           if (!a && (l_addr.as_u32 != e_addr.as_u32))
 882             {
 883               if (sw_if_index != ~0)
 884                 {
 885                   for (i = 0; i < vec_len (sm->to_resolve); i++)
 886                     {
 887                       rp = sm->to_resolve + i;
 888                       if (rp->addr_only)
 889                         continue;
 890                       if (rp->sw_if_index != sw_if_index &&
 891                           rp->l_addr.as_u32 != l_addr.as_u32 &&
 892                           rp->vrf_id != vrf_id && rp->l_port != l_port &&
 893                           rp->e_port != e_port && rp->proto != proto)
 894                         continue;
 895
 896                       vec_del1 (sm->to_resolve, i);
 897                       break;
 898                     }
 899                 }
 900               return VNET_API_ERROR_NO_SUCH_ENTRY;
 901             }
 902         }
 903
 904       pool_get (sm->static_mappings, m);
 905       clib_memset (m, 0, sizeof (*m));
 906       m->tag = vec_dup (tag);
 907       m->local_addr = l_addr;
 908       m->external_addr = e_addr;
 909       m->twice_nat = twice_nat;
 910       if (out2in_only)
 911         m->flags |= NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY;
 912       if (addr_only)
 913         m->flags |= NAT_STATIC_MAPPING_FLAG_ADDR_ONLY;
 914       if (identity_nat)
 915         {
 916           m->flags |= NAT_STATIC_MAPPING_FLAG_IDENTITY_NAT;
 917           pool_get (m->locals, local);
 918           local->vrf_id = vrf_id;
 919           local->fib_index = fib_index;
 920         }
 921       else
 922         {
 923           m->vrf_id = vrf_id;
 924           m->fib_index = fib_index;
 925         }
 926       if (!addr_only)
 927         {
 928           m->local_port = l_port;
 929           m->external_port = e_port;
 930           m->proto = proto;
 931         }
 932
 933       if (sm->num_workers > 1)
 934         {
 935           ip4_header_t ip = {
 936             .src_address = m->local_addr,
 937           };
 938           vec_add1 (m->workers, sm->worker_in2out_cb (&ip, m->fib_index, 0));
 939           tsm = vec_elt_at_index (sm->per_thread_data, m->workers[0]);
 940         }
 941       else
 942         tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
 943
 944       m_key.addr = m->local_addr;
 945       m_key.port = m->local_port;
 946       m_key.protocol = m->proto;
 947       m_key.fib_index = fib_index;
 948       kv.key = m_key.as_u64;
 949       kv.value = m - sm->static_mappings;
 950       if (!out2in_only)
 951         clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1);
 952
 953       m_key.addr = m->external_addr;
 954       m_key.port = m->external_port;
 955       m_key.fib_index = 0;
 956       kv.key = m_key.as_u64;
 957       kv.value = m - sm->static_mappings;
 958       clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 1);
 959
 960       /* Delete dynamic sessions matching local address (+ local port) */
 961       if (!(sm->static_mapping_only))
 962         {
 963           u_key.addr = m->local_addr;
 964           u_key.fib_index = m->fib_index;
 965           kv.key = u_key.as_u64;
 966           if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
 967             {
 968               user_index = value.value;
 969               u = pool_elt_at_index (tsm->users, user_index);
 970               if (u->nsessions)
 971                 {
 972                   head_index = u->sessions_per_user_list_head_index;
 973                   head = pool_elt_at_index (tsm->list_pool, head_index);
 974                   elt_index = head->next;
 975                   elt = pool_elt_at_index (tsm->list_pool, elt_index);
 976                   ses_index = elt->value;
 977                   while (ses_index != ~0)
 978                     {
 979                       s = pool_elt_at_index (tsm->sessions, ses_index);
 980                       elt = pool_elt_at_index (tsm->list_pool, elt->next);
 981                       ses_index = elt->value;
 982
 983                       if (snat_is_session_static (s))
 984                         continue;
 985
 986                       if (!addr_only
 987                           && (clib_net_to_host_u16 (s->in2out.port) !=
 988                               m->local_port))
 989                         continue;
 990
 991                       nat_free_session_data (sm, s,
 992                                              tsm - sm->per_thread_data, 0);
 993                       nat44_delete_session (sm, s, tsm - sm->per_thread_data);
 994
 995                       if (!addr_only && !sm->endpoint_dependent)
 996                         break;
 997                     }
 998                 }
 999             }
1000         }
1001     }
1002   else
1003     {
1004       if (!m)
1005         {
1006           if (sw_if_index != ~0)
1007             return 0;
1008           else
1009             return VNET_API_ERROR_NO_SUCH_ENTRY;
1010         }
1011
1012       if (identity_nat)
1013         {
1014           if (vrf_id == ~0)
1015             vrf_id = sm->inside_vrf_id;
1016
1017           /* *INDENT-OFF* */
1018           pool_foreach (local, m->locals,
1019           ({
1020             if (local->vrf_id == vrf_id)
1021               find = local - m->locals;
1022           }));
1023           /* *INDENT-ON* */
1024           if (find == ~0)
1025             return VNET_API_ERROR_NO_SUCH_ENTRY;
1026
1027           local = pool_elt_at_index (m->locals, find);
1028           fib_index = local->fib_index;
1029           pool_put (m->locals, local);
1030         }
1031       else
1032         fib_index = m->fib_index;
1033
1034       /* Free external address port */
1035       if (!(addr_only || sm->static_mapping_only || out2in_only))
1036         {
1037           for (i = 0; i < vec_len (sm->addresses); i++)
1038             {
1039               if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
1040                 {
1041                   a = sm->addresses + i;
1042                   switch (proto)
1043                     {
1044 #define _(N, j, n, s) \
1045                     case SNAT_PROTOCOL_##N: \
1046                       clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, e_port, 0); \
1047                       if (e_port > 1024) \
1048                         { \
1049                           a->busy_##n##_ports--; \
1050                           a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]--; \
1051                         } \
1052                       break;
1053                       foreach_snat_protocol
1054 #undef _
1055                     default:
1056                       nat_elog_info ("unknown protocol");
1057                       return VNET_API_ERROR_INVALID_VALUE_2;
1058                     }
1059                   break;
1060                 }
1061             }
1062         }
1063
1064       if (sm->num_workers > 1)
1065         tsm = vec_elt_at_index (sm->per_thread_data, m->workers[0]);
1066       else
1067         tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
1068
1069       m_key.addr = m->local_addr;
1070       m_key.port = m->local_port;
1071       m_key.protocol = m->proto;
1072       m_key.fib_index = fib_index;
1073       kv.key = m_key.as_u64;
1074       if (!out2in_only)
1075         clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 0);
1076
1077       /* Delete session(s) for static mapping if exist */
1078       if (!(sm->static_mapping_only) ||
1079           (sm->static_mapping_only && sm->static_mapping_connection_tracking))
1080         {
1081           u_key.addr = m->local_addr;
1082           u_key.fib_index = fib_index;
1083           kv.key = u_key.as_u64;
1084           if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
1085             {
1086               user_index = value.value;
1087               u = pool_elt_at_index (tsm->users, user_index);
1088               if (u->nstaticsessions)
1089                 {
1090                   head_index = u->sessions_per_user_list_head_index;
1091                   head = pool_elt_at_index (tsm->list_pool, head_index);
1092                   elt_index = head->next;
1093                   elt = pool_elt_at_index (tsm->list_pool, elt_index);
1094                   ses_index = elt->value;
1095                   while (ses_index != ~0)
1096                     {
1097                       s = pool_elt_at_index (tsm->sessions, ses_index);
1098                       elt = pool_elt_at_index (tsm->list_pool, elt->next);
1099                       ses_index = elt->value;
1100
1101                       if (!addr_only)
1102                         {
1103                           if ((s->out2in.addr.as_u32 != e_addr.as_u32) ||
1104                               (clib_net_to_host_u16 (s->out2in.port) !=
1105                                e_port))
1106                             continue;
1107                         }
1108
1109                       if (is_lb_session (s))
1110                         continue;
1111
1112                       if (!snat_is_session_static (s))
1113                         continue;
1114
1115                       nat_free_session_data (sm, s,
1116                                              tsm - sm->per_thread_data, 0);
1117                       nat44_delete_session (sm, s, tsm - sm->per_thread_data);
1118
1119                       if (!addr_only && !sm->endpoint_dependent)
1120                         break;
1121                     }
1122                 }
1123             }
1124         }
1125
1126       fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_PLUGIN_LOW);
1127       if (pool_elts (m->locals))
1128         return 0;
1129
1130       m_key.addr = m->external_addr;
1131       m_key.port = m->external_port;
1132       m_key.fib_index = 0;
1133       kv.key = m_key.as_u64;
1134       clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 0);
1135
1136       vec_free (m->tag);
1137       vec_free (m->workers);
1138       /* Delete static mapping from pool */
1139       pool_put (sm->static_mappings, m);
1140     }
1141
1142   if (!addr_only || (l_addr.as_u32 == e_addr.as_u32))
1143     return 0;
1144
1145   /* Add/delete external address to FIB */
1146   /* *INDENT-OFF* */
1147   pool_foreach (interface, sm->interfaces,
1148   ({
1149     if (nat_interface_is_inside(interface) || sm->out2in_dpo)
1150       continue;
1151
1152     snat_add_del_addr_to_fib(&e_addr, 32, interface->sw_if_index, is_add);
1153     break;
1154   }));
1155   pool_foreach (interface, sm->output_feature_interfaces,
1156   ({
1157     if (nat_interface_is_inside(interface) || sm->out2in_dpo)
1158       continue;
1159
1160     snat_add_del_addr_to_fib(&e_addr, 32, interface->sw_if_index, is_add);
1161     break;
1162   }));
1163   /* *INDENT-ON* */
1164
1165   return 0;
1166 }
1167
1168 int
1169 nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
1170                                  snat_protocol_t proto,
1171                                  nat44_lb_addr_port_t * locals, u8 is_add,
1172                                  twice_nat_type_t twice_nat, u8 out2in_only,
1173                                  u8 * tag, u32 affinity)
1174 {
1175   snat_main_t *sm = &snat_main;
1176   snat_static_mapping_t *m;
1177   snat_session_key_t m_key;
1178   clib_bihash_kv_8_8_t kv, value;
1179   snat_address_t *a = 0;
1180   int i;
1181   nat44_lb_addr_port_t *local;
1182   u32 elt_index, head_index, ses_index;
1183   snat_main_per_thread_data_t *tsm;
1184   snat_user_key_t u_key;
1185   snat_user_t *u;
1186   snat_session_t *s;
1187   dlist_elt_t *head, *elt;
1188   uword *bitmap = 0;
1189
1190   if (!sm->endpoint_dependent)
1191     return VNET_API_ERROR_FEATURE_DISABLED;
1192
1193   m_key.addr = e_addr;
1194   m_key.port = e_port;
1195   m_key.protocol = proto;
1196   m_key.fib_index = 0;
1197   kv.key = m_key.as_u64;
1198   if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
1199     m = 0;
1200   else
1201     m = pool_elt_at_index (sm->static_mappings, value.value);
1202
1203   if (is_add)
1204     {
1205       if (m)
1206         return VNET_API_ERROR_VALUE_EXIST;
1207
1208       if (vec_len (locals) < 2)
1209         return VNET_API_ERROR_INVALID_VALUE;
1210
1211       /* Find external address in allocated addresses and reserve port for
1212          address and port pair mapping when dynamic translations enabled */
1213       if (!(sm->static_mapping_only || out2in_only))
1214         {
1215           for (i = 0; i < vec_len (sm->addresses); i++)
1216             {
1217               if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
1218                 {
1219                   a = sm->addresses + i;
1220                   /* External port must be unused */
1221                   switch (proto)
1222                     {
1223 #define _(N, j, n, s) \
1224                     case SNAT_PROTOCOL_##N: \
1225                       if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, e_port)) \
1226                         return VNET_API_ERROR_INVALID_VALUE; \
1227                       clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, e_port, 1); \
1228                       if (e_port > 1024) \
1229                         { \
1230                           a->busy_##n##_ports++; \
1231                           a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]++; \
1232                         } \
1233                       break;
1234                       foreach_snat_protocol
1235 #undef _
1236                     default:
1237                       nat_elog_info ("unknown protocol");
1238                       return VNET_API_ERROR_INVALID_VALUE_2;
1239                     }
1240                   break;
1241                 }
1242             }
1243           /* External address must be allocated */
1244           if (!a)
1245             return VNET_API_ERROR_NO_SUCH_ENTRY;
1246         }
1247
1248       pool_get (sm->static_mappings, m);
1249       clib_memset (m, 0, sizeof (*m));
1250       m->tag = vec_dup (tag);
1251       m->external_addr = e_addr;
1252       m->external_port = e_port;
1253       m->proto = proto;
1254       m->twice_nat = twice_nat;
1255       m->flags |= NAT_STATIC_MAPPING_FLAG_LB;
1256       if (out2in_only)
1257         m->flags |= NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY;
1258       m->affinity = affinity;
1259
1260       if (affinity)
1261         m->affinity_per_service_list_head_index =
1262           nat_affinity_get_per_service_list_head_index ();
1263       else
1264         m->affinity_per_service_list_head_index = ~0;
1265
1266       m_key.addr = m->external_addr;
1267       m_key.port = m->external_port;
1268       m_key.protocol = m->proto;
1269       m_key.fib_index = 0;
1270       kv.key = m_key.as_u64;
1271       kv.value = m - sm->static_mappings;
1272       if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 1))
1273         {
1274           nat_elog_err ("static_mapping_by_external key add failed");
1275           return VNET_API_ERROR_UNSPECIFIED;
1276         }
1277
1278       m_key.fib_index = m->fib_index;
1279       for (i = 0; i < vec_len (locals); i++)
1280         {
1281           locals[i].fib_index =
1282             fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4,
1283                                                locals[i].vrf_id,
1284                                                FIB_SOURCE_PLUGIN_LOW);
1285           m_key.addr = locals[i].addr;
1286           m_key.fib_index = locals[i].fib_index;
1287           if (!out2in_only)
1288             {
1289               m_key.port = locals[i].port;
1290               kv.key = m_key.as_u64;
1291               kv.value = m - sm->static_mappings;
1292               clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1);
1293             }
1294           locals[i].prefix = (i == 0) ? locals[i].probability :
1295             (locals[i - 1].prefix + locals[i].probability);
1296           pool_get (m->locals, local);
1297           *local = locals[i];
1298           if (sm->num_workers > 1)
1299             {
1300               ip4_header_t ip = {
1301                 .src_address = locals[i].addr,
1302               };
1303               bitmap =
1304                 clib_bitmap_set (bitmap,
1305                                  sm->worker_in2out_cb (&ip, m->fib_index, 0),
1306                                  1);
1307             }
1308         }
1309
1310       /* Assign workers */
1311       if (sm->num_workers > 1)
1312         {
1313           /* *INDENT-OFF* */
1314           clib_bitmap_foreach (i, bitmap,
1315             ({
1316                vec_add1(m->workers, i);
1317             }));
1318           /* *INDENT-ON* */
1319         }
1320     }
1321   else
1322     {
1323       if (!m)
1324         return VNET_API_ERROR_NO_SUCH_ENTRY;
1325
1326       if (!is_lb_static_mapping (m))
1327         return VNET_API_ERROR_INVALID_VALUE;
1328
1329       /* Free external address port */
1330       if (!(sm->static_mapping_only || out2in_only))
1331         {
1332           for (i = 0; i < vec_len (sm->addresses); i++)
1333             {
1334               if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
1335                 {
1336                   a = sm->addresses + i;
1337                   switch (proto)
1338                     {
1339 #define _(N, j, n, s) \
1340                     case SNAT_PROTOCOL_##N: \
1341                       clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, e_port, 0); \
1342                       if (e_port > 1024) \
1343                         { \
1344                           a->busy_##n##_ports--; \
1345                           a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]--; \
1346                         } \
1347                       break;
1348                       foreach_snat_protocol
1349 #undef _
1350                     default:
1351                       nat_elog_info ("unknown protocol");
1352                       return VNET_API_ERROR_INVALID_VALUE_2;
1353                     }
1354                   break;
1355                 }
1356             }
1357         }
1358
1359       m_key.addr = m->external_addr;
1360       m_key.port = m->external_port;
1361       m_key.protocol = m->proto;
1362       m_key.fib_index = 0;
1363       kv.key = m_key.as_u64;
1364       if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 0))
1365         {
1366           nat_elog_err ("static_mapping_by_external key del failed");
1367           return VNET_API_ERROR_UNSPECIFIED;
1368         }
1369
1370       /* *INDENT-OFF* */
1371       pool_foreach (local, m->locals,
1372       ({
1373           fib_table_unlock (local->fib_index, FIB_PROTOCOL_IP4,
1374                             FIB_SOURCE_PLUGIN_LOW);
1375           m_key.addr = local->addr;
1376           if (!out2in_only)
1377             {
1378               m_key.port = local->port;
1379               m_key.fib_index = local->fib_index;
1380               kv.key = m_key.as_u64;
1381               if (clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 0))
1382                 {
1383                   nat_elog_err ("static_mapping_by_local key del failed");
1384                   return VNET_API_ERROR_UNSPECIFIED;
1385                 }
1386             }
1387
1388           if (sm->num_workers > 1)
1389             {
1390               ip4_header_t ip = {
1391                 .src_address = local->addr,
1392               };
1393               tsm = vec_elt_at_index (sm->per_thread_data,
1394                                       sm->worker_in2out_cb (&ip, m->fib_index, 0));
1395             }
1396           else
1397             tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
1398
1399           /* Delete sessions */
1400           u_key.addr = local->addr;
1401           u_key.fib_index = local->fib_index;
1402           kv.key = u_key.as_u64;
1403           if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
1404             {
1405               u = pool_elt_at_index (tsm->users, value.value);
1406               if (u->nstaticsessions)
1407                 {
1408                   head_index = u->sessions_per_user_list_head_index;
1409                   head = pool_elt_at_index (tsm->list_pool, head_index);
1410                   elt_index = head->next;
1411                   elt = pool_elt_at_index (tsm->list_pool, elt_index);
1412                   ses_index = elt->value;
1413                   while (ses_index != ~0)
1414                     {
1415                       s =  pool_elt_at_index (tsm->sessions, ses_index);
1416                       elt = pool_elt_at_index (tsm->list_pool, elt->next);
1417                       ses_index = elt->value;
1418
1419                       if (!(is_lb_session (s)))
1420                         continue;
1421
1422                       if ((s->in2out.addr.as_u32 != local->addr.as_u32) ||
1423                           (clib_net_to_host_u16 (s->in2out.port) != local->port))
1424                         continue;
1425
1426                       nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0);
1427                       nat44_delete_session (sm, s, tsm - sm->per_thread_data);
1428                     }
1429                 }
1430             }
1431       }));
1432       /* *INDENT-ON* */
1433       if (m->affinity)
1434         nat_affinity_flush_service (m->affinity_per_service_list_head_index);
1435       pool_free (m->locals);
1436       vec_free (m->tag);
1437       vec_free (m->workers);
1438
1439       pool_put (sm->static_mappings, m);
1440     }
1441
1442   return 0;
1443 }
1444
1445 int
1446 nat44_lb_static_mapping_add_del_local (ip4_address_t e_addr, u16 e_port,
1447                                        ip4_address_t l_addr, u16 l_port,
1448                                        snat_protocol_t proto, u32 vrf_id,
1449                                        u8 probability, u8 is_add)
1450 {
1451   snat_main_t *sm = &snat_main;
1452   snat_static_mapping_t *m = 0;
1453   snat_session_key_t m_key;
1454   clib_bihash_kv_8_8_t kv, value;
1455   nat44_lb_addr_port_t *local, *prev_local, *match_local = 0;
1456   snat_main_per_thread_data_t *tsm;
1457   snat_user_key_t u_key;
1458   snat_user_t *u;
1459   snat_session_t *s;
1460   dlist_elt_t *head, *elt;
1461   u32 elt_index, head_index, ses_index, *locals = 0;
1462   uword *bitmap = 0;
1463   int i;
1464
1465   if (!sm->endpoint_dependent)
1466     return VNET_API_ERROR_FEATURE_DISABLED;
1467
1468   m_key.addr = e_addr;
1469   m_key.port = e_port;
1470   m_key.protocol = proto;
1471   m_key.fib_index = 0;
1472   kv.key = m_key.as_u64;
1473   if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
1474     m = pool_elt_at_index (sm->static_mappings, value.value);
1475
1476   if (!m)
1477     return VNET_API_ERROR_NO_SUCH_ENTRY;
1478
1479   if (!is_lb_static_mapping (m))
1480     return VNET_API_ERROR_INVALID_VALUE;
1481
1482   /* *INDENT-OFF* */
1483   pool_foreach (local, m->locals,
1484   ({
1485     if ((local->addr.as_u32 == l_addr.as_u32) && (local->port == l_port) &&
1486         (local->vrf_id == vrf_id))
1487       {
1488         match_local = local;
1489         break;
1490       }
1491   }));
1492   /* *INDENT-ON* */
1493
1494   if (is_add)
1495     {
1496       if (match_local)
1497         return VNET_API_ERROR_VALUE_EXIST;
1498
1499       pool_get (m->locals, local);
1500       clib_memset (local, 0, sizeof (*local));
1501       local->addr.as_u32 = l_addr.as_u32;
1502       local->port = l_port;
1503       local->probability = probability;
1504       local->vrf_id = vrf_id;
1505       local->fib_index =
1506         fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id,
1507                                            FIB_SOURCE_PLUGIN_LOW);
1508
1509       if (!is_out2in_only_static_mapping (m))
1510         {
1511           m_key.addr = l_addr;
1512           m_key.port = l_port;
1513           m_key.fib_index = local->fib_index;
1514           kv.key = m_key.as_u64;
1515           kv.value = m - sm->static_mappings;
1516           if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1))
1517             nat_elog_err ("static_mapping_by_local key add failed");
1518         }
1519     }
1520   else
1521     {
1522       if (!match_local)
1523         return VNET_API_ERROR_NO_SUCH_ENTRY;
1524
1525       if (pool_elts (m->locals) < 3)
1526         return VNET_API_ERROR_UNSPECIFIED;
1527
1528       fib_table_unlock (match_local->fib_index, FIB_PROTOCOL_IP4,
1529                         FIB_SOURCE_PLUGIN_LOW);
1530
1531       if (!is_out2in_only_static_mapping (m))
1532         {
1533           m_key.addr = l_addr;
1534           m_key.port = l_port;
1535           m_key.fib_index = match_local->fib_index;
1536           kv.key = m_key.as_u64;
1537           if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 0))
1538             nat_elog_err ("static_mapping_by_local key del failed");
1539         }
1540
1541       if (sm->num_workers > 1)
1542         {
1543           ip4_header_t ip = {
1544             .src_address = local->addr,
1545           };
1546           tsm = vec_elt_at_index (sm->per_thread_data,
1547                                   sm->worker_in2out_cb (&ip, m->fib_index,
1548                                                         0));
1549         }
1550       else
1551         tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
1552
1553       /* Delete sessions */
1554       u_key.addr = match_local->addr;
1555       u_key.fib_index = match_local->fib_index;
1556       kv.key = u_key.as_u64;
1557       if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
1558         {
1559           u = pool_elt_at_index (tsm->users, value.value);
1560           if (u->nstaticsessions)
1561             {
1562               head_index = u->sessions_per_user_list_head_index;
1563               head = pool_elt_at_index (tsm->list_pool, head_index);
1564               elt_index = head->next;
1565               elt = pool_elt_at_index (tsm->list_pool, elt_index);
1566               ses_index = elt->value;
1567               while (ses_index != ~0)
1568                 {
1569                   s = pool_elt_at_index (tsm->sessions, ses_index);
1570                   elt = pool_elt_at_index (tsm->list_pool, elt->next);
1571                   ses_index = elt->value;
1572
1573                   if (!(is_lb_session (s)))
1574                     continue;
1575
1576                   if ((s->in2out.addr.as_u32 != match_local->addr.as_u32) ||
1577                       (clib_net_to_host_u16 (s->in2out.port) !=
1578                        match_local->port))
1579                     continue;
1580
1581                   nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0);
1582                   nat44_delete_session (sm, s, tsm - sm->per_thread_data);
1583                 }
1584             }
1585         }
1586
1587       pool_put (m->locals, match_local);
1588     }
1589
1590   vec_free (m->workers);
1591
1592   /* *INDENT-OFF* */
1593   pool_foreach (local, m->locals,
1594   ({
1595     vec_add1 (locals, local - m->locals);
1596     if (sm->num_workers > 1)
1597       {
1598         ip4_header_t ip;
1599         ip.src_address.as_u32 = local->addr.as_u32,
1600         bitmap = clib_bitmap_set (bitmap,
1601                                   sm->worker_in2out_cb (&ip, local->fib_index, 0),
1602                                   1);
1603       }
1604   }));
1605   /* *INDENT-ON* */
1606
1607   ASSERT (vec_len (locals) > 1);
1608
1609   local = pool_elt_at_index (m->locals, locals[0]);
1610   local->prefix = local->probability;
1611   for (i = 1; i < vec_len (locals); i++)
1612     {
1613       local = pool_elt_at_index (m->locals, locals[i]);
1614       prev_local = pool_elt_at_index (m->locals, locals[i - 1]);
1615       local->prefix = local->probability + prev_local->prefix;
1616     }
1617
1618   /* Assign workers */
1619   if (sm->num_workers > 1)
1620     {
1621       /* *INDENT-OFF* */
1622       clib_bitmap_foreach (i, bitmap, ({ vec_add1(m->workers, i); }));
1623       /* *INDENT-ON* */
1624     }
1625
1626   return 0;
1627 }
1628
1629 int
1630 snat_del_address (snat_main_t * sm, ip4_address_t addr, u8 delete_sm,
1631                   u8 twice_nat)
1632 {
1633   snat_address_t *a = 0;
1634   snat_session_t *ses;
1635   u32 *ses_to_be_removed = 0, *ses_index;
1636   snat_main_per_thread_data_t *tsm;
1637   snat_static_mapping_t *m;
1638   snat_interface_t *interface;
1639   int i;
1640   snat_address_t *addresses =
1641     twice_nat ? sm->twice_nat_addresses : sm->addresses;
1642
1643   /* Find SNAT address */
1644   for (i = 0; i < vec_len (addresses); i++)
1645     {
1646       if (addresses[i].addr.as_u32 == addr.as_u32)
1647         {
1648           a = addresses + i;
1649           break;
1650         }
1651     }
1652   if (!a)
1653     return VNET_API_ERROR_NO_SUCH_ENTRY;
1654
1655   if (delete_sm)
1656     {
1657       /* *INDENT-OFF* */
1658       pool_foreach (m, sm->static_mappings,
1659       ({
1660           if (m->external_addr.as_u32 == addr.as_u32)
1661             (void) snat_add_static_mapping (m->local_addr, m->external_addr,
1662                                             m->local_port, m->external_port,
1663                                             m->vrf_id, is_addr_only_static_mapping(m), ~0,
1664                                             m->proto, 0, m->twice_nat,
1665                                             is_out2in_only_static_mapping(m), m->tag, is_identity_static_mapping(m));
1666       }));
1667       /* *INDENT-ON* */
1668     }
1669   else
1670     {
1671       /* Check if address is used in some static mapping */
1672       if (is_snat_address_used_in_static_mapping (sm, addr))
1673         {
1674           nat_elog_notice ("address used in static mapping");
1675           return VNET_API_ERROR_UNSPECIFIED;
1676         }
1677     }
1678
1679   if (a->fib_index != ~0)
1680     fib_table_unlock (a->fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_PLUGIN_LOW);
1681
1682   /* Delete sessions using address */
1683   if (a->busy_tcp_ports || a->busy_udp_ports || a->busy_icmp_ports)
1684     {
1685       /* *INDENT-OFF* */
1686       vec_foreach (tsm, sm->per_thread_data)
1687         {
1688           pool_foreach (ses, tsm->sessions, ({
1689             if (ses->out2in.addr.as_u32 == addr.as_u32)
1690               {
1691                 nat_free_session_data (sm, ses, tsm - sm->per_thread_data, 0);
1692                 vec_add1 (ses_to_be_removed, ses - tsm->sessions);
1693               }
1694           }));
1695
1696           vec_foreach (ses_index, ses_to_be_removed)
1697             {
1698               ses = pool_elt_at_index (tsm->sessions, ses_index[0]);
1699               nat44_delete_session (sm, ses, tsm - sm->per_thread_data);
1700             }
1701
1702           vec_free (ses_to_be_removed);
1703         }
1704       /* *INDENT-ON* */
1705     }
1706
1707 #define _(N, i, n, s) \
1708   clib_bitmap_free (a->busy_##n##_port_bitmap); \
1709   vec_free (a->busy_##n##_ports_per_thread);
1710   foreach_snat_protocol
1711 #undef _
1712     if (twice_nat)
1713     {
1714       vec_del1 (sm->twice_nat_addresses, i);
1715       return 0;
1716     }
1717   else
1718     vec_del1 (sm->addresses, i);
1719
1720   /* Delete external address from FIB */
1721   /* *INDENT-OFF* */
1722   pool_foreach (interface, sm->interfaces,
1723   ({
1724     if (nat_interface_is_inside(interface) || sm->out2in_dpo)
1725       continue;
1726
1727     snat_add_del_addr_to_fib(&addr, 32, interface->sw_if_index, 0);
1728     break;
1729   }));
1730   pool_foreach (interface, sm->output_feature_interfaces,
1731   ({
1732     if (nat_interface_is_inside(interface) || sm->out2in_dpo)
1733       continue;
1734
1735     snat_add_del_addr_to_fib(&addr, 32, interface->sw_if_index, 0);
1736     break;
1737   }));
1738   /* *INDENT-ON* */
1739
1740   return 0;
1741 }
1742
1743 int
1744 snat_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del)
1745 {
1746   snat_main_t *sm = &snat_main;
1747   snat_interface_t *i;
1748   const char *feature_name, *del_feature_name;
1749   snat_address_t *ap;
1750   snat_static_mapping_t *m;
1751   snat_det_map_t *dm;
1752   nat_outside_fib_t *outside_fib;
1753   u32 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1754                                                        sw_if_index);
1755
1756   if (sm->out2in_dpo && !is_inside)
1757     return VNET_API_ERROR_UNSUPPORTED;
1758
1759   /* *INDENT-OFF* */
1760   pool_foreach (i, sm->output_feature_interfaces,
1761   ({
1762     if (i->sw_if_index == sw_if_index)
1763       return VNET_API_ERROR_VALUE_EXIST;
1764   }));
1765   /* *INDENT-ON* */
1766
1767   if (sm->static_mapping_only && !(sm->static_mapping_connection_tracking))
1768     feature_name = is_inside ? "nat44-in2out-fast" : "nat44-out2in-fast";
1769   else
1770     {
1771       if (sm->num_workers > 1 && !sm->deterministic)
1772         feature_name =
1773           is_inside ? "nat44-in2out-worker-handoff" :
1774           "nat44-out2in-worker-handoff";
1775       else if (sm->deterministic)
1776         feature_name = is_inside ? "nat44-det-in2out" : "nat44-det-out2in";
1777       else if (sm->endpoint_dependent)
1778         feature_name = is_inside ? "nat44-ed-in2out" : "nat44-ed-out2in";
1779       else
1780         feature_name = is_inside ? "nat44-in2out" : "nat44-out2in";
1781     }
1782
1783   if (sm->fq_in2out_index == ~0 && !sm->deterministic && sm->num_workers > 1)
1784     sm->fq_in2out_index = vlib_frame_queue_main_init (sm->in2out_node_index,
1785                                                       NAT_FQ_NELTS);
1786
1787   if (sm->fq_out2in_index == ~0 && !sm->deterministic && sm->num_workers > 1)
1788     sm->fq_out2in_index = vlib_frame_queue_main_init (sm->out2in_node_index,
1789                                                       NAT_FQ_NELTS);
1790
1791   if (!is_inside)
1792     {
1793       /* *INDENT-OFF* */
1794       vec_foreach (outside_fib, sm->outside_fibs)
1795         {
1796           if (outside_fib->fib_index == fib_index)
1797             {
1798               if (is_del)
1799                 {
1800                   outside_fib->refcount--;
1801                   if (!outside_fib->refcount)
1802                     vec_del1 (sm->outside_fibs, outside_fib - sm->outside_fibs);
1803                 }
1804               else
1805                 outside_fib->refcount++;
1806               goto feature_set;
1807             }
1808         }
1809       /* *INDENT-ON* */
1810       if (!is_del)
1811         {
1812           vec_add2 (sm->outside_fibs, outside_fib, 1);
1813           outside_fib->refcount = 1;
1814           outside_fib->fib_index = fib_index;
1815         }
1816     }
1817 feature_set:
1818   /* *INDENT-OFF* */
1819   pool_foreach (i, sm->interfaces,
1820   ({
1821     if (i->sw_if_index == sw_if_index)
1822       {
1823         if (is_del)
1824           {
1825             if (nat_interface_is_inside(i) && nat_interface_is_outside(i))
1826               {
1827                 if (is_inside)
1828                   i->flags &= ~NAT_INTERFACE_FLAG_IS_INSIDE;
1829                 else
1830                   i->flags &= ~NAT_INTERFACE_FLAG_IS_OUTSIDE;
1831
1832                 if (sm->num_workers > 1 && !sm->deterministic)
1833                   {
1834                     del_feature_name = "nat44-handoff-classify";
1835                     feature_name = !is_inside ?  "nat44-in2out-worker-handoff" :
1836                                                  "nat44-out2in-worker-handoff";
1837                   }
1838                 else if (sm->deterministic)
1839                   {
1840                     del_feature_name = "nat44-det-classify";
1841                     feature_name = !is_inside ?  "nat44-det-in2out" :
1842                                                  "nat44-det-out2in";
1843                   }
1844                 else if (sm->endpoint_dependent)
1845                   {
1846                     del_feature_name = "nat44-ed-classify";
1847                     feature_name = !is_inside ?  "nat44-ed-in2out" :
1848                                                  "nat44-ed-out2in";
1849                   }
1850                 else
1851                   {
1852                     del_feature_name = "nat44-classify";
1853                     feature_name = !is_inside ?  "nat44-in2out" : "nat44-out2in";
1854                   }
1855
1856                 vnet_feature_enable_disable ("ip4-unicast", del_feature_name,
1857                                              sw_if_index, 0, 0, 0);
1858                 vnet_feature_enable_disable ("ip4-unicast", feature_name,
1859                                              sw_if_index, 1, 0, 0);
1860                 if (!is_inside)
1861                   {
1862                     if (sm->endpoint_dependent)
1863                       vnet_feature_enable_disable ("ip4-local",
1864                                                    "nat44-ed-hairpinning",
1865                                                    sw_if_index, 1, 0, 0);
1866                     else if (!sm->deterministic)
1867                       vnet_feature_enable_disable ("ip4-local",
1868                                                    "nat44-hairpinning",
1869                                                    sw_if_index, 1, 0, 0);
1870                   }
1871               }
1872             else
1873               {
1874                 vnet_feature_enable_disable ("ip4-unicast", feature_name,
1875                                              sw_if_index, 0, 0, 0);
1876                 pool_put (sm->interfaces, i);
1877                 if (is_inside)
1878                   {
1879                     if (sm->endpoint_dependent)
1880                       vnet_feature_enable_disable ("ip4-local",
1881                                                    "nat44-ed-hairpinning",
1882                                                    sw_if_index, 0, 0, 0);
1883                     else if (!sm->deterministic)
1884                       vnet_feature_enable_disable ("ip4-local",
1885                                                    "nat44-hairpinning",
1886                                                    sw_if_index, 0, 0, 0);
1887                   }
1888               }
1889           }
1890         else
1891           {
1892             if ((nat_interface_is_inside(i) && is_inside) ||
1893                 (nat_interface_is_outside(i) && !is_inside))
1894               return 0;
1895
1896             if (sm->num_workers > 1 && !sm->deterministic)
1897               {
1898                 del_feature_name = !is_inside ?  "nat44-in2out-worker-handoff" :
1899                                                  "nat44-out2in-worker-handoff";
1900                 feature_name = "nat44-handoff-classify";
1901               }
1902             else if (sm->deterministic)
1903               {
1904                 del_feature_name = !is_inside ?  "nat44-det-in2out" :
1905                                                  "nat44-det-out2in";
1906                 feature_name = "nat44-det-classify";
1907               }
1908             else if (sm->endpoint_dependent)
1909               {
1910                 del_feature_name = !is_inside ?  "nat44-ed-in2out" :
1911                                                  "nat44-ed-out2in";
1912                 feature_name = "nat44-ed-classify";
1913               }
1914             else
1915               {
1916                 del_feature_name = !is_inside ?  "nat44-in2out" : "nat44-out2in";
1917                 feature_name = "nat44-classify";
1918               }
1919
1920             vnet_feature_enable_disable ("ip4-unicast", del_feature_name,
1921                                          sw_if_index, 0, 0, 0);
1922             vnet_feature_enable_disable ("ip4-unicast", feature_name,
1923                                          sw_if_index, 1, 0, 0);
1924             if (!is_inside)
1925               {
1926                 if (sm->endpoint_dependent)
1927                   vnet_feature_enable_disable ("ip4-local", "nat44-ed-hairpinning",
1928                                                sw_if_index, 0, 0, 0);
1929                 else if (!sm->deterministic)
1930                   vnet_feature_enable_disable ("ip4-local", "nat44-hairpinning",
1931                                                sw_if_index, 0, 0, 0);
1932               }
1933             goto set_flags;
1934           }
1935
1936         goto fib;
1937       }
1938   }));
1939   /* *INDENT-ON* */
1940
1941   if (is_del)
1942     return VNET_API_ERROR_NO_SUCH_ENTRY;
1943
1944   pool_get (sm->interfaces, i);
1945   i->sw_if_index = sw_if_index;
1946   i->flags = 0;
1947   vnet_feature_enable_disable ("ip4-unicast", feature_name, sw_if_index, 1, 0,
1948                                0);
1949
1950   if (is_inside && !sm->out2in_dpo)
1951     {
1952       if (sm->endpoint_dependent)
1953         vnet_feature_enable_disable ("ip4-local", "nat44-ed-hairpinning",
1954                                      sw_if_index, 1, 0, 0);
1955       else if (!sm->deterministic)
1956         vnet_feature_enable_disable ("ip4-local", "nat44-hairpinning",
1957                                      sw_if_index, 1, 0, 0);
1958     }
1959
1960 set_flags:
1961   if (is_inside)
1962     {
1963       i->flags |= NAT_INTERFACE_FLAG_IS_INSIDE;
1964       return 0;
1965     }
1966   else
1967     i->flags |= NAT_INTERFACE_FLAG_IS_OUTSIDE;
1968
1969   /* Add/delete external addresses to FIB */
1970 fib:
1971   /* *INDENT-OFF* */
1972   vec_foreach (ap, sm->addresses)
1973     snat_add_del_addr_to_fib(&ap->addr, 32, sw_if_index, !is_del);
1974
1975   pool_foreach (m, sm->static_mappings,
1976   ({
1977     if (!(is_addr_only_static_mapping(m)) || (m->local_addr.as_u32 == m->external_addr.as_u32))
1978       continue;
1979
1980     snat_add_del_addr_to_fib(&m->external_addr, 32, sw_if_index, !is_del);
1981   }));
1982
1983   pool_foreach (dm, sm->det_maps,
1984   ({
1985     snat_add_del_addr_to_fib(&dm->out_addr, dm->out_plen, sw_if_index, !is_del);
1986   }));
1987   /* *INDENT-ON* */
1988
1989   return 0;
1990 }
1991
1992 int
1993 snat_interface_add_del_output_feature (u32 sw_if_index,
1994                                        u8 is_inside, int is_del)
1995 {
1996   snat_main_t *sm = &snat_main;
1997   snat_interface_t *i;
1998   snat_address_t *ap;
1999   snat_static_mapping_t *m;
2000   nat_outside_fib_t *outside_fib;
2001   u32 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2002                                                        sw_if_index);
2003
2004
2005   if (sm->deterministic ||
2006       (sm->static_mapping_only && !(sm->static_mapping_connection_tracking)))
2007     return VNET_API_ERROR_UNSUPPORTED;
2008
2009   /* *INDENT-OFF* */
2010   pool_foreach (i, sm->interfaces,
2011   ({
2012     if (i->sw_if_index == sw_if_index)
2013       return VNET_API_ERROR_VALUE_EXIST;
2014   }));
2015   /* *INDENT-ON* */
2016
2017   if (!is_inside)
2018     {
2019       /* *INDENT-OFF* */
2020       vec_foreach (outside_fib, sm->outside_fibs)
2021         {
2022           if (outside_fib->fib_index == fib_index)
2023             {
2024               if (is_del)
2025                 {
2026                   outside_fib->refcount--;
2027                   if (!outside_fib->refcount)
2028                     vec_del1 (sm->outside_fibs, outside_fib - sm->outside_fibs);
2029                 }
2030               else
2031                 outside_fib->refcount++;
2032               goto feature_set;
2033             }
2034         }
2035       /* *INDENT-ON* */
2036       if (!is_del)
2037         {
2038           vec_add2 (sm->outside_fibs, outside_fib, 1);
2039           outside_fib->refcount = 1;
2040           outside_fib->fib_index = fib_index;
2041         }
2042     }
2043
2044 feature_set:
2045   if (is_inside)
2046     {
2047       if (sm->endpoint_dependent)
2048         {
2049           vnet_feature_enable_disable ("ip4-unicast", "nat44-ed-hairpin-dst",
2050                                        sw_if_index, !is_del, 0, 0);
2051           vnet_feature_enable_disable ("ip4-output", "nat44-ed-hairpin-src",
2052                                        sw_if_index, !is_del, 0, 0);
2053         }
2054       else
2055         {
2056           vnet_feature_enable_disable ("ip4-unicast", "nat44-hairpin-dst",
2057                                        sw_if_index, !is_del, 0, 0);
2058           vnet_feature_enable_disable ("ip4-output", "nat44-hairpin-src",
2059                                        sw_if_index, !is_del, 0, 0);
2060         }
2061       goto fq;
2062     }
2063
2064   if (sm->num_workers > 1)
2065     {
2066       vnet_feature_enable_disable ("ip4-unicast",
2067                                    "nat44-out2in-worker-handoff",
2068                                    sw_if_index, !is_del, 0, 0);
2069       vnet_feature_enable_disable ("ip4-output",
2070                                    "nat44-in2out-output-worker-handoff",
2071                                    sw_if_index, !is_del, 0, 0);
2072     }
2073   else
2074     {
2075       if (sm->endpoint_dependent)
2076         {
2077           vnet_feature_enable_disable ("ip4-unicast", "nat44-ed-out2in",
2078                                        sw_if_index, !is_del, 0, 0);
2079           vnet_feature_enable_disable ("ip4-output", "nat44-ed-in2out-output",
2080                                        sw_if_index, !is_del, 0, 0);
2081         }
2082       else
2083         {
2084           vnet_feature_enable_disable ("ip4-unicast", "nat44-out2in",
2085                                        sw_if_index, !is_del, 0, 0);
2086           vnet_feature_enable_disable ("ip4-output", "nat44-in2out-output",
2087                                        sw_if_index, !is_del, 0, 0);
2088         }
2089     }
2090
2091 fq:
2092   if (sm->fq_in2out_output_index == ~0 && sm->num_workers > 1)
2093     sm->fq_in2out_output_index =
2094       vlib_frame_queue_main_init (sm->in2out_output_node_index, 0);
2095
2096   if (sm->fq_out2in_index == ~0 && sm->num_workers > 1)
2097     sm->fq_out2in_index =
2098       vlib_frame_queue_main_init (sm->out2in_node_index, 0);
2099
2100   /* *INDENT-OFF* */
2101   pool_foreach (i, sm->output_feature_interfaces,
2102   ({
2103     if (i->sw_if_index == sw_if_index)
2104       {
2105         if (is_del)
2106           pool_put (sm->output_feature_interfaces, i);
2107         else
2108           return VNET_API_ERROR_VALUE_EXIST;
2109
2110         goto fib;
2111       }
2112   }));
2113   /* *INDENT-ON* */
2114
2115   if (is_del)
2116     return VNET_API_ERROR_NO_SUCH_ENTRY;
2117
2118   pool_get (sm->output_feature_interfaces, i);
2119   i->sw_if_index = sw_if_index;
2120   i->flags = 0;
2121   if (is_inside)
2122     i->flags |= NAT_INTERFACE_FLAG_IS_INSIDE;
2123   else
2124     i->flags |= NAT_INTERFACE_FLAG_IS_OUTSIDE;
2125
2126   /* Add/delete external addresses to FIB */
2127 fib:
2128   if (is_inside)
2129     return 0;
2130
2131   /* *INDENT-OFF* */
2132   vec_foreach (ap, sm->addresses)
2133     snat_add_del_addr_to_fib(&ap->addr, 32, sw_if_index, !is_del);
2134
2135   pool_foreach (m, sm->static_mappings,
2136   ({
2137     if (!((is_addr_only_static_mapping(m)))  || (m->local_addr.as_u32 == m->external_addr.as_u32))
2138       continue;
2139
2140     snat_add_del_addr_to_fib(&m->external_addr, 32, sw_if_index, !is_del);
2141   }));
2142   /* *INDENT-ON* */
2143
2144   return 0;
2145 }
2146
2147 int
2148 snat_set_workers (uword * bitmap)
2149 {
2150   snat_main_t *sm = &snat_main;
2151   int i, j = 0;
2152
2153   if (sm->num_workers < 2)
2154     return VNET_API_ERROR_FEATURE_DISABLED;
2155
2156   if (clib_bitmap_last_set (bitmap) >= sm->num_workers)
2157     return VNET_API_ERROR_INVALID_WORKER;
2158
2159   vec_free (sm->workers);
2160   /* *INDENT-OFF* */
2161   clib_bitmap_foreach (i, bitmap,
2162     ({
2163       vec_add1(sm->workers, i);
2164       sm->per_thread_data[sm->first_worker_index + i].snat_thread_index = j;
2165       sm->per_thread_data[sm->first_worker_index + i].thread_index = i;
2166       j++;
2167     }));
2168   /* *INDENT-ON* */
2169
2170   sm->port_per_thread = (0xffff - 1024) / _vec_len (sm->workers);
2171   sm->num_snat_thread = _vec_len (sm->workers);
2172
2173   return 0;
2174 }
2175
2176 static void
2177 snat_update_outside_fib (u32 sw_if_index, u32 new_fib_index,
2178                          u32 old_fib_index)
2179 {
2180   snat_main_t *sm = &snat_main;
2181   nat_outside_fib_t *outside_fib;
2182   snat_interface_t *i;
2183   u8 is_add = 1;
2184   u8 match = 0;
2185
2186   if (new_fib_index == old_fib_index)
2187     return;
2188
2189   if (!vec_len (sm->outside_fibs))
2190     return;
2191
2192   /* *INDENT-OFF* */
2193   pool_foreach (i, sm->interfaces,
2194     ({
2195       if (i->sw_if_index == sw_if_index)
2196         {
2197           if (!(nat_interface_is_outside (i)))
2198             return;
2199           match = 1;
2200         }
2201     }));
2202   /* *INDENT-ON* */
2203
2204   if (!match)
2205     return;
2206
2207   vec_foreach (outside_fib, sm->outside_fibs)
2208   {
2209     if (outside_fib->fib_index == old_fib_index)
2210       {
2211         outside_fib->refcount--;
2212         if (!outside_fib->refcount)
2213           vec_del1 (sm->outside_fibs, outside_fib - sm->outside_fibs);
2214         break;
2215       }
2216   }
2217
2218   vec_foreach (outside_fib, sm->outside_fibs)
2219   {
2220     if (outside_fib->fib_index == new_fib_index)
2221       {
2222         outside_fib->refcount++;
2223         is_add = 0;
2224         break;
2225       }
2226   }
2227
2228   if (is_add)
2229     {
2230       vec_add2 (sm->outside_fibs, outside_fib, 1);
2231       outside_fib->refcount = 1;
2232       outside_fib->fib_index = new_fib_index;
2233     }
2234 }
2235
2236 static void
2237 snat_ip4_table_bind (ip4_main_t * im,
2238                      uword opaque,
2239                      u32 sw_if_index, u32 new_fib_index, u32 old_fib_index)
2240 {
2241   snat_update_outside_fib (sw_if_index, new_fib_index, old_fib_index);
2242 }
2243
2244 static void
2245 snat_ip4_add_del_interface_address_cb (ip4_main_t * im,
2246                                        uword opaque,
2247                                        u32 sw_if_index,
2248                                        ip4_address_t * address,
2249                                        u32 address_length,
2250                                        u32 if_address_index, u32 is_delete);
2251
2252 static void
2253 nat_ip4_add_del_addr_only_sm_cb (ip4_main_t * im,
2254                                  uword opaque,
2255                                  u32 sw_if_index,
2256                                  ip4_address_t * address,
2257                                  u32 address_length,
2258                                  u32 if_address_index, u32 is_delete);
2259
2260 static int
2261 nat_alloc_addr_and_port_default (snat_address_t * addresses,
2262                                  u32 fib_index,
2263                                  u32 thread_index,
2264                                  snat_session_key_t * k,
2265                                  u16 port_per_thread, u32 snat_thread_index);
2266
2267 static clib_error_t *
2268 snat_init (vlib_main_t * vm)
2269 {
2270   snat_main_t *sm = &snat_main;
2271   clib_error_t *error = 0;
2272   ip4_main_t *im = &ip4_main;
2273   ip_lookup_main_t *lm = &im->lookup_main;
2274   uword *p;
2275   vlib_thread_registration_t *tr;
2276   vlib_thread_main_t *tm = vlib_get_thread_main ();
2277   uword *bitmap = 0;
2278   u32 i;
2279   ip4_add_del_interface_address_callback_t cb4;
2280   vlib_node_t *node;
2281
2282   sm->vlib_main = vm;
2283   sm->vnet_main = vnet_get_main ();
2284   sm->ip4_main = im;
2285   sm->ip4_lookup_main = lm;
2286   sm->api_main = &api_main;
2287   sm->first_worker_index = 0;
2288   sm->num_workers = 0;
2289   sm->num_snat_thread = 1;
2290   sm->workers = 0;
2291   sm->port_per_thread = 0xffff - 1024;
2292   sm->fq_in2out_index = ~0;
2293   sm->fq_in2out_output_index = ~0;
2294   sm->fq_out2in_index = ~0;
2295   sm->udp_timeout = SNAT_UDP_TIMEOUT;
2296   sm->tcp_established_timeout = SNAT_TCP_ESTABLISHED_TIMEOUT;
2297   sm->tcp_transitory_timeout = SNAT_TCP_TRANSITORY_TIMEOUT;
2298   sm->icmp_timeout = SNAT_ICMP_TIMEOUT;
2299   sm->alloc_addr_and_port = nat_alloc_addr_and_port_default;
2300   sm->addr_and_port_alloc_alg = NAT_ADDR_AND_PORT_ALLOC_ALG_DEFAULT;
2301   sm->forwarding_enabled = 0;
2302   sm->log_class = vlib_log_register_class ("nat", 0);
2303   sm->log_level = SNAT_LOG_ERROR;
2304   sm->mss_clamping = 0;
2305
2306   node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
2307   sm->error_node_index = node->index;
2308
2309   node = vlib_get_node_by_name (vm, (u8 *) "nat44-in2out");
2310   sm->in2out_node_index = node->index;
2311   node = vlib_get_node_by_name (vm, (u8 *) "nat44-in2out-output");
2312   sm->in2out_output_node_index = node->index;
2313   node = vlib_get_node_by_name (vm, (u8 *) "nat44-in2out-fast");
2314   sm->in2out_fast_node_index = node->index;
2315   node = vlib_get_node_by_name (vm, (u8 *) "nat44-in2out-slowpath");
2316   sm->in2out_slowpath_node_index = node->index;
2317   node = vlib_get_node_by_name (vm, (u8 *) "nat44-in2out-output-slowpath");
2318   sm->in2out_slowpath_output_node_index = node->index;
2319   node = vlib_get_node_by_name (vm, (u8 *) "nat44-in2out-reass");
2320   sm->in2out_reass_node_index = node->index;
2321
2322   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-in2out");
2323   sm->ed_in2out_node_index = node->index;
2324   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-in2out-slowpath");
2325   sm->ed_in2out_slowpath_node_index = node->index;
2326   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-in2out-reass");
2327   sm->ed_in2out_reass_node_index = node->index;
2328
2329   node = vlib_get_node_by_name (vm, (u8 *) "nat44-out2in");
2330   sm->out2in_node_index = node->index;
2331   node = vlib_get_node_by_name (vm, (u8 *) "nat44-out2in-fast");
2332   sm->out2in_fast_node_index = node->index;
2333   node = vlib_get_node_by_name (vm, (u8 *) "nat44-out2in-reass");
2334   sm->out2in_reass_node_index = node->index;
2335
2336   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-out2in");
2337   sm->ed_out2in_node_index = node->index;
2338   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-out2in-slowpath");
2339   sm->ed_out2in_slowpath_node_index = node->index;
2340   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-out2in-reass");
2341   sm->ed_out2in_reass_node_index = node->index;
2342
2343   node = vlib_get_node_by_name (vm, (u8 *) "nat44-det-in2out");
2344   sm->det_in2out_node_index = node->index;
2345   node = vlib_get_node_by_name (vm, (u8 *) "nat44-det-out2in");
2346   sm->det_out2in_node_index = node->index;
2347
2348   node = vlib_get_node_by_name (vm, (u8 *) "nat44-hairpinning");
2349   sm->hairpinning_node_index = node->index;
2350   node = vlib_get_node_by_name (vm, (u8 *) "nat44-hairpin-dst");
2351   sm->hairpin_dst_node_index = node->index;
2352   node = vlib_get_node_by_name (vm, (u8 *) "nat44-hairpin-src");
2353   sm->hairpin_src_node_index = node->index;
2354   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-hairpinning");
2355   sm->ed_hairpinning_node_index = node->index;
2356   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-hairpin-dst");
2357   sm->ed_hairpin_dst_node_index = node->index;
2358   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-hairpin-src");
2359   sm->ed_hairpin_src_node_index = node->index;
2360
2361   p = hash_get_mem (tm->thread_registrations_by_name, "workers");
2362   if (p)
2363     {
2364       tr = (vlib_thread_registration_t *) p[0];
2365       if (tr)
2366         {
2367           sm->num_workers = tr->count;
2368           sm->first_worker_index = tr->first_index;
2369         }
2370     }
2371
2372   vec_validate (sm->per_thread_data, tm->n_vlib_mains - 1);
2373
2374   /* Use all available workers by default */
2375   if (sm->num_workers > 1)
2376     {
2377       for (i = 0; i < sm->num_workers; i++)
2378         bitmap = clib_bitmap_set (bitmap, i, 1);
2379       snat_set_workers (bitmap);
2380       clib_bitmap_free (bitmap);
2381     }
2382   else
2383     {
2384       sm->per_thread_data[0].snat_thread_index = 0;
2385     }
2386
2387   error = snat_api_init (vm, sm);
2388   if (error)
2389     return error;
2390
2391   /* Set up the interface address add/del callback */
2392   cb4.function = snat_ip4_add_del_interface_address_cb;
2393   cb4.function_opaque = 0;
2394
2395   vec_add1 (im->add_del_interface_address_callbacks, cb4);
2396
2397   cb4.function = nat_ip4_add_del_addr_only_sm_cb;
2398   cb4.function_opaque = 0;
2399
2400   vec_add1 (im->add_del_interface_address_callbacks, cb4);
2401
2402   nat_dpo_module_init ();
2403
2404   /* Init counters */
2405   sm->total_users.name = "total-users";
2406   sm->total_users.stat_segment_name = "/nat44/total-users";
2407   vlib_validate_simple_counter (&sm->total_users, 0);
2408   vlib_zero_simple_counter (&sm->total_users, 0);
2409   sm->total_sessions.name = "total-sessions";
2410   sm->total_sessions.stat_segment_name = "/nat44/total-sessions";
2411   vlib_validate_simple_counter (&sm->total_sessions, 0);
2412   vlib_zero_simple_counter (&sm->total_sessions, 0);
2413
2414   /* Init IPFIX logging */
2415   snat_ipfix_logging_init (vm);
2416
2417   /* Init NAT64 */
2418   error = nat64_init (vm);
2419   if (error)
2420     return error;
2421
2422   dslite_init (vm);
2423
2424   nat66_init (vm);
2425
2426   ip4_table_bind_callback_t cbt4 = {
2427     .function = snat_ip4_table_bind,
2428   };
2429   vec_add1 (ip4_main.table_bind_callbacks, cbt4);
2430
2431   /* Init virtual fragmenentation reassembly */
2432   return nat_reass_init (vm);
2433 }
2434
2435 VLIB_INIT_FUNCTION (snat_init);
2436
2437 void
2438 snat_free_outside_address_and_port (snat_address_t * addresses,
2439                                     u32 thread_index, snat_session_key_t * k)
2440 {
2441   snat_address_t *a;
2442   u32 address_index;
2443   u16 port_host_byte_order = clib_net_to_host_u16 (k->port);
2444
2445   for (address_index = 0; address_index < vec_len (addresses);
2446        address_index++)
2447     {
2448       if (addresses[address_index].addr.as_u32 == k->addr.as_u32)
2449         break;
2450     }
2451
2452   ASSERT (address_index < vec_len (addresses));
2453
2454   a = addresses + address_index;
2455
2456   switch (k->protocol)
2457     {
2458 #define _(N, i, n, s) \
2459     case SNAT_PROTOCOL_##N: \
2460       ASSERT (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, \
2461         port_host_byte_order) == 1); \
2462       clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, \
2463         port_host_byte_order, 0); \
2464       a->busy_##n##_ports--; \
2465       a->busy_##n##_ports_per_thread[thread_index]--; \
2466       break;
2467       foreach_snat_protocol
2468 #undef _
2469     default:
2470       nat_elog_info ("unknown protocol");
2471       return;
2472     }
2473 }
2474
2475 static int
2476 nat_set_outside_address_and_port (snat_address_t * addresses,
2477                                   u32 thread_index, snat_session_key_t * k)
2478 {
2479   snat_address_t *a = 0;
2480   u32 address_index;
2481   u16 port_host_byte_order = clib_net_to_host_u16 (k->port);
2482
2483   for (address_index = 0; address_index < vec_len (addresses);
2484        address_index++)
2485     {
2486       if (addresses[address_index].addr.as_u32 != k->addr.as_u32)
2487         continue;
2488
2489       a = addresses + address_index;
2490       switch (k->protocol)
2491         {
2492 #define _(N, j, n, s) \
2493         case SNAT_PROTOCOL_##N: \
2494           if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, port_host_byte_order)) \
2495             return VNET_API_ERROR_INSTANCE_IN_USE; \
2496           clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, port_host_byte_order, 1); \
2497           a->busy_##n##_ports_per_thread[thread_index]++; \
2498           a->busy_##n##_ports++; \
2499           return 0;
2500           foreach_snat_protocol
2501 #undef _
2502         default:
2503           nat_elog_info ("unknown protocol");
2504           return 1;
2505         }
2506     }
2507
2508   return VNET_API_ERROR_NO_SUCH_ENTRY;
2509 }
2510
2511 int
2512 snat_static_mapping_match (snat_main_t * sm,
2513                            snat_session_key_t match,
2514                            snat_session_key_t * mapping,
2515                            u8 by_external,
2516                            u8 * is_addr_only,
2517                            twice_nat_type_t * twice_nat,
2518                            lb_nat_type_t * lb, ip4_address_t * ext_host_addr,
2519                            u8 * is_identity_nat)
2520 {
2521   clib_bihash_kv_8_8_t kv, value;
2522   snat_static_mapping_t *m;
2523   snat_session_key_t m_key;
2524   clib_bihash_8_8_t *mapping_hash = &sm->static_mapping_by_local;
2525   u32 rand, lo = 0, hi, mid, *tmp = 0, i;
2526   u8 backend_index;
2527   nat44_lb_addr_port_t *local;
2528
2529   m_key.fib_index = match.fib_index;
2530   if (by_external)
2531     {
2532       mapping_hash = &sm->static_mapping_by_external;
2533       m_key.fib_index = 0;
2534     }
2535
2536   m_key.addr = match.addr;
2537   m_key.port = clib_net_to_host_u16 (match.port);
2538   m_key.protocol = match.protocol;
2539
2540   kv.key = m_key.as_u64;
2541
2542   if (clib_bihash_search_8_8 (mapping_hash, &kv, &value))
2543     {
2544       /* Try address only mapping */
2545       m_key.port = 0;
2546       m_key.protocol = 0;
2547       kv.key = m_key.as_u64;
2548       if (clib_bihash_search_8_8 (mapping_hash, &kv, &value))
2549         return 1;
2550     }
2551
2552   m = pool_elt_at_index (sm->static_mappings, value.value);
2553
2554   if (by_external)
2555     {
2556       if (is_lb_static_mapping (m))
2557         {
2558           if (PREDICT_FALSE (lb != 0))
2559             *lb = m->affinity ? AFFINITY_LB_NAT : LB_NAT;
2560           if (m->affinity && !nat_affinity_find_and_lock (ext_host_addr[0],
2561                                                           match.addr,
2562                                                           match.protocol,
2563                                                           match.port,
2564                                                           &backend_index))
2565             {
2566               local = pool_elt_at_index (m->locals, backend_index);
2567               mapping->addr = local->addr;
2568               mapping->port = clib_host_to_net_u16 (local->port);
2569               mapping->fib_index = local->fib_index;
2570               goto end;
2571             }
2572           // pick locals matching this worker
2573           if (PREDICT_FALSE (sm->num_workers > 1))
2574             {
2575               u32 thread_index = vlib_get_thread_index ();
2576               /* *INDENT-OFF* */
2577               pool_foreach_index (i, m->locals,
2578               ({
2579                 local = pool_elt_at_index (m->locals, i);
2580
2581                 ip4_header_t ip = {
2582                   .src_address = local->addr,
2583                 };
2584
2585                 if (sm->worker_in2out_cb (&ip, m->fib_index, 0) ==
2586                     thread_index)
2587                   {
2588                     vec_add1 (tmp, i);
2589                   }
2590               }));
2591               /* *INDENT-ON* */
2592               ASSERT (vec_len (tmp) != 0);
2593             }
2594           else
2595             {
2596               /* *INDENT-OFF* */
2597               pool_foreach_index (i, m->locals,
2598               ({
2599                 vec_add1 (tmp, i);
2600               }));
2601               /* *INDENT-ON* */
2602             }
2603           hi = vec_len (tmp) - 1;
2604           local = pool_elt_at_index (m->locals, tmp[hi]);
2605           rand = 1 + (random_u32 (&sm->random_seed) % local->prefix);
2606           while (lo < hi)
2607             {
2608               mid = ((hi - lo) >> 1) + lo;
2609               local = pool_elt_at_index (m->locals, tmp[mid]);
2610               (rand > local->prefix) ? (lo = mid + 1) : (hi = mid);
2611             }
2612           local = pool_elt_at_index (m->locals, tmp[lo]);
2613           if (!(local->prefix >= rand))
2614             return 1;
2615           mapping->addr = local->addr;
2616           mapping->port = clib_host_to_net_u16 (local->port);
2617           mapping->fib_index = local->fib_index;
2618           if (m->affinity)
2619             {
2620               if (nat_affinity_create_and_lock (ext_host_addr[0], match.addr,
2621                                                 match.protocol, match.port,
2622                                                 tmp[lo], m->affinity,
2623                                                 m->affinity_per_service_list_head_index))
2624                 nat_elog_info ("create affinity record failed");
2625             }
2626           vec_free (tmp);
2627         }
2628       else
2629         {
2630           if (PREDICT_FALSE (lb != 0))
2631             *lb = NO_LB_NAT;
2632           mapping->fib_index = m->fib_index;
2633           mapping->addr = m->local_addr;
2634           /* Address only mapping doesn't change port */
2635           mapping->port = is_addr_only_static_mapping (m) ? match.port
2636             : clib_host_to_net_u16 (m->local_port);
2637         }
2638       mapping->protocol = m->proto;
2639     }
2640   else
2641     {
2642       mapping->addr = m->external_addr;
2643       /* Address only mapping doesn't change port */
2644       mapping->port = is_addr_only_static_mapping (m) ? match.port
2645         : clib_host_to_net_u16 (m->external_port);
2646       mapping->fib_index = sm->outside_fib_index;
2647     }
2648
2649 end:
2650   if (PREDICT_FALSE (is_addr_only != 0))
2651     *is_addr_only = is_addr_only_static_mapping (m);
2652
2653   if (PREDICT_FALSE (twice_nat != 0))
2654     *twice_nat = m->twice_nat;
2655
2656   if (PREDICT_FALSE (is_identity_nat != 0))
2657     *is_identity_nat = is_identity_static_mapping (m);
2658
2659   return 0;
2660 }
2661
2662 static_always_inline u16
2663 snat_random_port (u16 min, u16 max)
2664 {
2665   snat_main_t *sm = &snat_main;
2666   return min + random_u32 (&sm->random_seed) /
2667     (random_u32_max () / (max - min + 1) + 1);
2668 }
2669
2670 int
2671 snat_alloc_outside_address_and_port (snat_address_t * addresses,
2672                                      u32 fib_index,
2673                                      u32 thread_index,
2674                                      snat_session_key_t * k,
2675                                      u16 port_per_thread,
2676                                      u32 snat_thread_index)
2677 {
2678   snat_main_t *sm = &snat_main;
2679
2680   return sm->alloc_addr_and_port (addresses, fib_index, thread_index, k,
2681                                   port_per_thread, snat_thread_index);
2682 }
2683
2684 static int
2685 nat_alloc_addr_and_port_default (snat_address_t * addresses,
2686                                  u32 fib_index,
2687                                  u32 thread_index,
2688                                  snat_session_key_t * k,
2689                                  u16 port_per_thread, u32 snat_thread_index)
2690 {
2691   int i;
2692   snat_address_t *a, *ga = 0;
2693   u32 portnum;
2694
2695   for (i = 0; i < vec_len (addresses); i++)
2696     {
2697       a = addresses + i;
2698       switch (k->protocol)
2699         {
2700 #define _(N, j, n, s) \
2701         case SNAT_PROTOCOL_##N: \
2702           if (a->busy_##n##_ports_per_thread[thread_index] < port_per_thread) \
2703             { \
2704               if (a->fib_index == fib_index) \
2705                 { \
2706                   while (1) \
2707                     { \
2708                       portnum = (port_per_thread * \
2709                         snat_thread_index) + \
2710                         snat_random_port(1, port_per_thread) + 1024; \
2711                       if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, portnum)) \
2712                         continue; \
2713                       clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, portnum, 1); \
2714                       a->busy_##n##_ports_per_thread[thread_index]++; \
2715                       a->busy_##n##_ports++; \
2716                       k->addr = a->addr; \
2717                       k->port = clib_host_to_net_u16(portnum); \
2718                       return 0; \
2719                     } \
2720                 } \
2721               else if (a->fib_index == ~0) \
2722                 { \
2723                   ga = a; \
2724                 } \
2725             } \
2726           break;
2727           foreach_snat_protocol
2728 #undef _
2729         default:
2730           nat_elog_info ("unknown protocol");
2731           return 1;
2732         }
2733
2734     }
2735
2736   if (ga)
2737     {
2738       a = ga;
2739       switch (k->protocol)
2740         {
2741 #define _(N, j, n, s) \
2742         case SNAT_PROTOCOL_##N: \
2743           while (1) \
2744             { \
2745               portnum = (port_per_thread * \
2746                 snat_thread_index) + \
2747                 snat_random_port(1, port_per_thread) + 1024; \
2748               if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, portnum)) \
2749                 continue; \
2750               clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, portnum, 1); \
2751               a->busy_##n##_ports_per_thread[thread_index]++; \
2752               a->busy_##n##_ports++; \
2753               k->addr = a->addr; \
2754               k->port = clib_host_to_net_u16(portnum); \
2755               return 0; \
2756             }
2757           break;
2758           foreach_snat_protocol
2759 #undef _
2760         default:
2761           nat_elog_info ("unknown protocol");
2762           return 1;
2763         }
2764     }
2765
2766   /* Totally out of translations to use... */
2767   snat_ipfix_logging_addresses_exhausted (thread_index, 0);
2768   return 1;
2769 }
2770
2771 static int
2772 nat_alloc_addr_and_port_mape (snat_address_t * addresses,
2773                               u32 fib_index,
2774                               u32 thread_index,
2775                               snat_session_key_t * k,
2776                               u16 port_per_thread, u32 snat_thread_index)
2777 {
2778   snat_main_t *sm = &snat_main;
2779   snat_address_t *a = addresses;
2780   u16 m, ports, portnum, A, j;
2781   m = 16 - (sm->psid_offset + sm->psid_length);
2782   ports = (1 << (16 - sm->psid_length)) - (1 << m);
2783
2784   if (!vec_len (addresses))
2785     goto exhausted;
2786
2787   switch (k->protocol)
2788     {
2789 #define _(N, i, n, s) \
2790     case SNAT_PROTOCOL_##N: \
2791       if (a->busy_##n##_ports < ports) \
2792         { \
2793           while (1) \
2794             { \
2795               A = snat_random_port(1, pow2_mask(sm->psid_offset)); \
2796               j = snat_random_port(0, pow2_mask(m)); \
2797               portnum = A | (sm->psid << sm->psid_offset) | (j << (16 - m)); \
2798               if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, portnum)) \
2799                 continue; \
2800               clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, portnum, 1); \
2801               a->busy_##n##_ports++; \
2802               k->addr = a->addr; \
2803               k->port = clib_host_to_net_u16 (portnum); \
2804               return 0; \
2805             } \
2806         } \
2807       break;
2808       foreach_snat_protocol
2809 #undef _
2810     default:
2811       nat_elog_info ("unknown protocol");
2812       return 1;
2813     }
2814
2815 exhausted:
2816   /* Totally out of translations to use... */
2817   snat_ipfix_logging_addresses_exhausted (thread_index, 0);
2818   return 1;
2819 }
2820
2821 static int
2822 nat_alloc_addr_and_port_range (snat_address_t * addresses,
2823                                u32 fib_index,
2824                                u32 thread_index,
2825                                snat_session_key_t * k,
2826                                u16 port_per_thread, u32 snat_thread_index)
2827 {
2828   snat_main_t *sm = &snat_main;
2829   snat_address_t *a = addresses;
2830   u16 portnum, ports;
2831
2832   ports = sm->end_port - sm->start_port + 1;
2833
2834   if (!vec_len (addresses))
2835     goto exhausted;
2836
2837   switch (k->protocol)
2838     {
2839 #define _(N, i, n, s) \
2840     case SNAT_PROTOCOL_##N: \
2841       if (a->busy_##n##_ports < ports) \
2842         { \
2843           while (1) \
2844             { \
2845               portnum = snat_random_port(sm->start_port, sm->end_port); \
2846               if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, portnum)) \
2847                 continue; \
2848               clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, portnum, 1); \
2849               a->busy_##n##_ports++; \
2850               k->addr = a->addr; \
2851               k->port = clib_host_to_net_u16 (portnum); \
2852               return 0; \
2853             } \
2854         } \
2855       break;
2856       foreach_snat_protocol
2857 #undef _
2858     default:
2859       nat_elog_info ("unknown protocol");
2860       return 1;
2861     }
2862
2863 exhausted:
2864   /* Totally out of translations to use... */
2865   snat_ipfix_logging_addresses_exhausted (thread_index, 0);
2866   return 1;
2867 }
2868
2869 void
2870 nat44_add_del_address_dpo (ip4_address_t addr, u8 is_add)
2871 {
2872   dpo_id_t dpo_v4 = DPO_INVALID;
2873   fib_prefix_t pfx = {
2874     .fp_proto = FIB_PROTOCOL_IP4,
2875     .fp_len = 32,
2876     .fp_addr.ip4.as_u32 = addr.as_u32,
2877   };
2878
2879   if (is_add)
2880     {
2881       nat_dpo_create (DPO_PROTO_IP4, 0, &dpo_v4);
2882       fib_table_entry_special_dpo_add (0, &pfx, FIB_SOURCE_PLUGIN_HI,
2883                                        FIB_ENTRY_FLAG_EXCLUSIVE, &dpo_v4);
2884       dpo_reset (&dpo_v4);
2885     }
2886   else
2887     {
2888       fib_table_entry_special_remove (0, &pfx, FIB_SOURCE_PLUGIN_HI);
2889     }
2890 }
2891
2892 u8 *
2893 format_session_kvp (u8 * s, va_list * args)
2894 {
2895   clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *);
2896   snat_session_key_t k;
2897
2898   k.as_u64 = v->key;
2899
2900   s = format (s, "%U session-index %llu", format_snat_key, &k, v->value);
2901
2902   return s;
2903 }
2904
2905 u8 *
2906 format_static_mapping_kvp (u8 * s, va_list * args)
2907 {
2908   clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *);
2909   snat_session_key_t k;
2910
2911   k.as_u64 = v->key;
2912
2913   s = format (s, "%U static-mapping-index %llu",
2914               format_static_mapping_key, &k, v->value);
2915
2916   return s;
2917 }
2918
2919 u8 *
2920 format_user_kvp (u8 * s, va_list * args)
2921 {
2922   clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *);
2923   snat_user_key_t k;
2924
2925   k.as_u64 = v->key;
2926
2927   s = format (s, "%U fib %d user-index %llu", format_ip4_address, &k.addr,
2928               k.fib_index, v->value);
2929
2930   return s;
2931 }
2932
2933 u8 *
2934 format_ed_session_kvp (u8 * s, va_list * args)
2935 {
2936   clib_bihash_kv_16_8_t *v = va_arg (*args, clib_bihash_kv_16_8_t *);
2937   nat_ed_ses_key_t k;
2938
2939   k.as_u64[0] = v->key[0];
2940   k.as_u64[1] = v->key[1];
2941
2942   s =
2943     format (s, "local %U:%d remote %U:%d proto %U fib %d session-index %llu",
2944             format_ip4_address, &k.l_addr, clib_net_to_host_u16 (k.l_port),
2945             format_ip4_address, &k.r_addr, clib_net_to_host_u16 (k.r_port),
2946             format_ip_protocol, k.proto, k.fib_index, v->value);
2947
2948   return s;
2949 }
2950
2951 static u32
2952 snat_get_worker_in2out_cb (ip4_header_t * ip0, u32 rx_fib_index0,
2953                            u8 is_output)
2954 {
2955   snat_main_t *sm = &snat_main;
2956   u32 next_worker_index = 0;
2957   u32 hash;
2958
2959   next_worker_index = sm->first_worker_index;
2960   hash = ip0->src_address.as_u32 + (ip0->src_address.as_u32 >> 8) +
2961     (ip0->src_address.as_u32 >> 16) + (ip0->src_address.as_u32 >> 24);
2962
2963   if (PREDICT_TRUE (is_pow2 (_vec_len (sm->workers))))
2964     next_worker_index += sm->workers[hash & (_vec_len (sm->workers) - 1)];
2965   else
2966     next_worker_index += sm->workers[hash % _vec_len (sm->workers)];
2967
2968   return next_worker_index;
2969 }
2970
2971 static u32
2972 snat_get_worker_out2in_cb (ip4_header_t * ip0, u32 rx_fib_index0,
2973                            u8 is_output)
2974 {
2975   snat_main_t *sm = &snat_main;
2976   udp_header_t *udp;
2977   u16 port;
2978   snat_session_key_t m_key;
2979   clib_bihash_kv_8_8_t kv, value;
2980   snat_static_mapping_t *m;
2981   u32 proto;
2982   u32 next_worker_index = 0;
2983
2984   /* first try static mappings without port */
2985   if (PREDICT_FALSE (pool_elts (sm->static_mappings)))
2986     {
2987       m_key.addr = ip0->dst_address;
2988       m_key.port = 0;
2989       m_key.protocol = 0;
2990       m_key.fib_index = rx_fib_index0;
2991       kv.key = m_key.as_u64;
2992       if (!clib_bihash_search_8_8
2993           (&sm->static_mapping_by_external, &kv, &value))
2994         {
2995           m = pool_elt_at_index (sm->static_mappings, value.value);
2996           return m->workers[0];
2997         }
2998     }
2999
3000   proto = ip_proto_to_snat_proto (ip0->protocol);
3001   udp = ip4_next_header (ip0);
3002   port = udp->dst_port;
3003
3004   if (PREDICT_FALSE (ip4_is_fragment (ip0)))
3005     {
3006       if (PREDICT_FALSE (nat_reass_is_drop_frag (0)))
3007         return vlib_get_thread_index ();
3008
3009       nat_reass_ip4_t *reass;
3010       reass = nat_ip4_reass_find (ip0->src_address, ip0->dst_address,
3011                                   ip0->fragment_id, ip0->protocol);
3012
3013       if (reass && (reass->thread_index != (u32) ~ 0))
3014         return reass->thread_index;
3015
3016       if (ip4_is_first_fragment (ip0))
3017         {
3018           reass =
3019             nat_ip4_reass_create (ip0->src_address, ip0->dst_address,
3020                                   ip0->fragment_id, ip0->protocol);
3021           if (!reass)
3022             goto no_reass;
3023
3024           if (PREDICT_FALSE (pool_elts (sm->static_mappings)))
3025             {
3026               m_key.addr = ip0->dst_address;
3027               m_key.port = clib_net_to_host_u16 (port);
3028               m_key.protocol = proto;
3029               m_key.fib_index = rx_fib_index0;
3030               kv.key = m_key.as_u64;
3031               if (!clib_bihash_search_8_8
3032                   (&sm->static_mapping_by_external, &kv, &value))
3033                 {
3034                   m = pool_elt_at_index (sm->static_mappings, value.value);
3035                   reass->thread_index = m->workers[0];
3036                   return reass->thread_index;
3037                 }
3038             }
3039           reass->thread_index = sm->first_worker_index;
3040           reass->thread_index +=
3041             sm->workers[(clib_net_to_host_u16 (port) - 1024) /
3042                         sm->port_per_thread];
3043           return reass->thread_index;
3044         }
3045       else
3046         return vlib_get_thread_index ();
3047     }
3048
3049 no_reass:
3050   /* unknown protocol */
3051   if (PREDICT_FALSE (proto == ~0))
3052     {
3053       /* use current thread */
3054       return vlib_get_thread_index ();
3055     }
3056
3057   if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_ICMP))
3058     {
3059       icmp46_header_t *icmp = (icmp46_header_t *) udp;
3060       icmp_echo_header_t *echo = (icmp_echo_header_t *) (icmp + 1);
3061       if (!icmp_is_error_message (icmp))
3062         port = echo->identifier;
3063       else
3064         {
3065           ip4_header_t *inner_ip = (ip4_header_t *) (echo + 1);
3066           proto = ip_proto_to_snat_proto (inner_ip->protocol);
3067           void *l4_header = ip4_next_header (inner_ip);
3068           switch (proto)
3069             {
3070             case SNAT_PROTOCOL_ICMP:
3071               icmp = (icmp46_header_t *) l4_header;
3072               echo = (icmp_echo_header_t *) (icmp + 1);
3073               port = echo->identifier;
3074               break;
3075             case SNAT_PROTOCOL_UDP:
3076             case SNAT_PROTOCOL_TCP:
3077               port = ((tcp_udp_header_t *) l4_header)->src_port;
3078               break;
3079             default:
3080               return vlib_get_thread_index ();
3081             }
3082         }
3083     }
3084
3085   /* try static mappings with port */
3086   if (PREDICT_FALSE (pool_elts (sm->static_mappings)))
3087     {
3088       m_key.addr = ip0->dst_address;
3089       m_key.port = clib_net_to_host_u16 (port);
3090       m_key.protocol = proto;
3091       m_key.fib_index = rx_fib_index0;
3092       kv.key = m_key.as_u64;
3093       if (!clib_bihash_search_8_8
3094           (&sm->static_mapping_by_external, &kv, &value))
3095         {
3096           m = pool_elt_at_index (sm->static_mappings, value.value);
3097           return m->workers[0];
3098         }
3099     }
3100
3101   /* worker by outside port */
3102   next_worker_index = sm->first_worker_index;
3103   next_worker_index +=
3104     sm->workers[(clib_net_to_host_u16 (port) - 1024) / sm->port_per_thread];
3105   return next_worker_index;
3106 }
3107
3108 static u32
3109 nat44_ed_get_worker_in2out_cb (ip4_header_t * ip, u32 rx_fib_index,
3110                                u8 is_output)
3111 {
3112   snat_main_t *sm = &snat_main;
3113   u32 next_worker_index = sm->first_worker_index;
3114   u32 hash;
3115
3116   clib_bihash_kv_16_8_t kv16, value16;
3117   snat_main_per_thread_data_t *tsm;
3118   udp_header_t *udp;
3119
3120   if (PREDICT_FALSE (is_output))
3121     {
3122       u32 fib_index = sm->outside_fib_index;
3123       nat_outside_fib_t *outside_fib;
3124       fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
3125       fib_prefix_t pfx = {
3126         .fp_proto = FIB_PROTOCOL_IP4,
3127         .fp_len = 32,
3128         .fp_addr = {
3129                     .ip4.as_u32 = ip->dst_address.as_u32,
3130                     }
3131         ,
3132       };
3133
3134       udp = ip4_next_header (ip);
3135
3136       switch (vec_len (sm->outside_fibs))
3137         {
3138         case 0:
3139           fib_index = sm->outside_fib_index;
3140           break;
3141         case 1:
3142           fib_index = sm->outside_fibs[0].fib_index;
3143           break;
3144         default:
3145             /* *INDENT-OFF* */
3146             vec_foreach (outside_fib, sm->outside_fibs)
3147               {
3148                 fei = fib_table_lookup (outside_fib->fib_index, &pfx);
3149                 if (FIB_NODE_INDEX_INVALID != fei)
3150                   {
3151                     if (fib_entry_get_resolving_interface (fei) != ~0)
3152                       {
3153                         fib_index = outside_fib->fib_index;
3154                         break;
3155                       }
3156                   }
3157               }
3158             /* *INDENT-ON* */
3159           break;
3160         }
3161
3162       make_ed_kv (&kv16, &ip->src_address, &ip->dst_address,
3163                   ip->protocol, fib_index, udp->src_port, udp->dst_port);
3164
3165       /* *INDENT-OFF* */
3166       vec_foreach (tsm, sm->per_thread_data)
3167         {
3168           if (PREDICT_TRUE (!clib_bihash_search_16_8 (&tsm->out2in_ed,
3169                                                       &kv16, &value16)))
3170             {
3171               next_worker_index += tsm->thread_index;
3172
3173               nat_elog_debug_handoff (
3174                 "HANDOFF IN2OUT-OUTPUT-FEATURE (session)",
3175                 next_worker_index, fib_index,
3176                 clib_net_to_host_u32 (ip->src_address.as_u32),
3177                 clib_net_to_host_u32 (ip->dst_address.as_u32));
3178
3179               return next_worker_index;
3180             }
3181         }
3182       /* *INDENT-ON* */
3183     }
3184
3185   hash = ip->src_address.as_u32 + (ip->src_address.as_u32 >> 8) +
3186     (ip->src_address.as_u32 >> 16) + (ip->src_address.as_u32 >> 24);
3187
3188   if (PREDICT_TRUE (is_pow2 (_vec_len (sm->workers))))
3189     next_worker_index += sm->workers[hash & (_vec_len (sm->workers) - 1)];
3190   else
3191     next_worker_index += sm->workers[hash % _vec_len (sm->workers)];
3192
3193   if (PREDICT_TRUE (!is_output))
3194     {
3195       nat_elog_debug_handoff ("HANDOFF IN2OUT",
3196                               next_worker_index, rx_fib_index,
3197                               clib_net_to_host_u32 (ip->src_address.as_u32),
3198                               clib_net_to_host_u32 (ip->dst_address.as_u32));
3199     }
3200   else
3201     {
3202       nat_elog_debug_handoff ("HANDOFF IN2OUT-OUTPUT-FEATURE",
3203                               next_worker_index, rx_fib_index,
3204                               clib_net_to_host_u32 (ip->src_address.as_u32),
3205                               clib_net_to_host_u32 (ip->dst_address.as_u32));
3206     }
3207
3208   return next_worker_index;
3209 }
3210
3211 static u32
3212 nat44_ed_get_worker_out2in_cb (ip4_header_t * ip, u32 rx_fib_index,
3213                                u8 is_output)
3214 {
3215   snat_main_t *sm = &snat_main;
3216   clib_bihash_kv_8_8_t kv, value;
3217   clib_bihash_kv_16_8_t kv16, value16;
3218   snat_main_per_thread_data_t *tsm;
3219
3220   u32 proto, next_worker_index = 0;
3221   udp_header_t *udp;
3222   u16 port;
3223   snat_static_mapping_t *m;
3224   u32 hash;
3225
3226   proto = ip_proto_to_snat_proto (ip->protocol);
3227
3228   if (PREDICT_TRUE (proto == SNAT_PROTOCOL_UDP || proto == SNAT_PROTOCOL_TCP))
3229     {
3230       udp = ip4_next_header (ip);
3231
3232       make_ed_kv (&kv16, &ip->dst_address, &ip->src_address,
3233                   ip->protocol, rx_fib_index, udp->dst_port, udp->src_port);
3234
3235       /* *INDENT-OFF* */
3236       vec_foreach (tsm, sm->per_thread_data)
3237         {
3238           if (PREDICT_TRUE (!clib_bihash_search_16_8 (&tsm->out2in_ed,
3239                                                       &kv16, &value16)))
3240             {
3241               next_worker_index = sm->first_worker_index + tsm->thread_index;
3242               nat_elog_debug_handoff ("HANDOFF OUT2IN (session)",
3243                           next_worker_index, rx_fib_index,
3244                           clib_net_to_host_u32 (ip->src_address.as_u32),
3245                           clib_net_to_host_u32 (ip->dst_address.as_u32));
3246               return next_worker_index;
3247             }
3248           }
3249         /* *INDENT-ON* */
3250     }
3251   else if (proto == SNAT_PROTOCOL_ICMP)
3252     {
3253       nat_ed_ses_key_t key;
3254
3255       if (!get_icmp_o2i_ed_key (ip, &key))
3256         {
3257
3258           key.fib_index = rx_fib_index;
3259           kv16.key[0] = key.as_u64[0];
3260           kv16.key[1] = key.as_u64[1];
3261
3262           /* *INDENT-OFF* */
3263           vec_foreach (tsm, sm->per_thread_data)
3264             {
3265               if (PREDICT_TRUE (!clib_bihash_search_16_8 (&tsm->out2in_ed,
3266                                                           &kv16, &value16)))
3267                 {
3268                   next_worker_index = sm->first_worker_index +
3269                                       tsm->thread_index;
3270                   nat_elog_debug_handoff ("HANDOFF OUT2IN (session)",
3271                               next_worker_index, rx_fib_index,
3272                               clib_net_to_host_u32 (ip->src_address.as_u32),
3273                               clib_net_to_host_u32 (ip->dst_address.as_u32));
3274                   return next_worker_index;
3275                 }
3276             }
3277           /* *INDENT-ON* */
3278         }
3279     }
3280
3281   /* first try static mappings without port */
3282   if (PREDICT_FALSE (pool_elts (sm->static_mappings)))
3283     {
3284       make_sm_kv (&kv, &ip->dst_address, 0, 0, 0);
3285       if (!clib_bihash_search_8_8
3286           (&sm->static_mapping_by_external, &kv, &value))
3287         {
3288           m = pool_elt_at_index (sm->static_mappings, value.value);
3289           next_worker_index = m->workers[0];
3290           goto done;
3291         }
3292     }
3293
3294   /* unknown protocol */
3295   if (PREDICT_FALSE (proto == ~0))
3296     {
3297       /* use current thread */
3298       next_worker_index = vlib_get_thread_index ();
3299       goto done;
3300     }
3301
3302   udp = ip4_next_header (ip);
3303   port = udp->dst_port;
3304
3305   if (PREDICT_FALSE (ip->protocol == IP_PROTOCOL_ICMP))
3306     {
3307       icmp46_header_t *icmp = (icmp46_header_t *) udp;
3308       icmp_echo_header_t *echo = (icmp_echo_header_t *) (icmp + 1);
3309       if (!icmp_is_error_message (icmp))
3310         port = echo->identifier;
3311       else
3312         {
3313           ip4_header_t *inner_ip = (ip4_header_t *) (echo + 1);
3314           proto = ip_proto_to_snat_proto (inner_ip->protocol);
3315           void *l4_header = ip4_next_header (inner_ip);
3316           switch (proto)
3317             {
3318             case SNAT_PROTOCOL_ICMP:
3319               icmp = (icmp46_header_t *) l4_header;
3320               echo = (icmp_echo_header_t *) (icmp + 1);
3321               port = echo->identifier;
3322               break;
3323             case SNAT_PROTOCOL_UDP:
3324             case SNAT_PROTOCOL_TCP:
3325               port = ((tcp_udp_header_t *) l4_header)->src_port;
3326               break;
3327             default:
3328               next_worker_index = vlib_get_thread_index ();
3329               goto done;
3330             }
3331         }
3332     }
3333
3334   /* try static mappings with port */
3335   if (PREDICT_FALSE (pool_elts (sm->static_mappings)))
3336     {
3337       make_sm_kv (&kv, &ip->dst_address, proto, 0,
3338                   clib_net_to_host_u16 (port));
3339       if (!clib_bihash_search_8_8
3340           (&sm->static_mapping_by_external, &kv, &value))
3341         {
3342           m = pool_elt_at_index (sm->static_mappings, value.value);
3343           if (!is_lb_static_mapping (m))
3344             {
3345               next_worker_index = m->workers[0];
3346               goto done;
3347             }
3348
3349           hash = ip->src_address.as_u32 + (ip->src_address.as_u32 >> 8) +
3350             (ip->src_address.as_u32 >> 16) + (ip->src_address.as_u32 >> 24);
3351
3352           if (PREDICT_TRUE (is_pow2 (_vec_len (m->workers))))
3353             next_worker_index =
3354               m->workers[hash & (_vec_len (m->workers) - 1)];
3355           else
3356             next_worker_index = m->workers[hash % _vec_len (m->workers)];
3357           goto done;
3358         }
3359     }
3360
3361   /* worker by outside port */
3362   next_worker_index = sm->first_worker_index;
3363   next_worker_index +=
3364     sm->workers[(clib_net_to_host_u16 (port) - 1024) / sm->port_per_thread];
3365
3366 done:
3367   nat_elog_debug_handoff ("HANDOFF OUT2IN", next_worker_index, rx_fib_index,
3368                           clib_net_to_host_u32 (ip->src_address.as_u32),
3369                           clib_net_to_host_u32 (ip->dst_address.as_u32));
3370   return next_worker_index;
3371 }
3372
3373 void
3374 nat_ha_sadd_cb (ip4_address_t * in_addr, u16 in_port,
3375                 ip4_address_t * out_addr, u16 out_port,
3376                 ip4_address_t * eh_addr, u16 eh_port,
3377                 ip4_address_t * ehn_addr, u16 ehn_port, u8 proto,
3378                 u32 fib_index, u16 flags, u32 thread_index)
3379 {
3380   snat_main_t *sm = &snat_main;
3381   snat_session_key_t key;
3382   snat_user_t *u;
3383   snat_session_t *s;
3384   clib_bihash_kv_8_8_t kv;
3385   f64 now = vlib_time_now (sm->vlib_main);
3386   nat_outside_fib_t *outside_fib;
3387   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
3388   snat_main_per_thread_data_t *tsm;
3389   fib_prefix_t pfx = {
3390     .fp_proto = FIB_PROTOCOL_IP4,
3391     .fp_len = 32,
3392     .fp_addr = {
3393                 .ip4.as_u32 = eh_addr->as_u32,
3394                 },
3395   };
3396
3397   tsm = vec_elt_at_index (sm->per_thread_data, thread_index);
3398
3399   key.addr.as_u32 = out_addr->as_u32;
3400   key.port = out_port;
3401   key.protocol = proto;
3402
3403   if (!(flags & SNAT_SESSION_FLAG_STATIC_MAPPING))
3404     {
3405       if (nat_set_outside_address_and_port
3406           (sm->addresses, thread_index, &key))
3407         return;
3408     }
3409
3410   u = nat_user_get_or_create (sm, in_addr, fib_index, thread_index);
3411   if (!u)
3412     return;
3413
3414   s = nat_session_alloc_or_recycle (sm, u, thread_index, now);
3415   if (!s)
3416     return;
3417
3418   s->last_heard = now;
3419   s->flags = flags;
3420   s->ext_host_addr.as_u32 = eh_addr->as_u32;
3421   s->ext_host_port = eh_port;
3422   user_session_increment (sm, u, snat_is_session_static (s));
3423   switch (vec_len (sm->outside_fibs))
3424     {
3425     case 0:
3426       key.fib_index = sm->outside_fib_index;
3427       break;
3428     case 1:
3429       key.fib_index = sm->outside_fibs[0].fib_index;
3430       break;
3431     default:
3432       /* *INDENT-OFF* */
3433       vec_foreach (outside_fib, sm->outside_fibs)
3434         {
3435           fei = fib_table_lookup (outside_fib->fib_index, &pfx);
3436           if (FIB_NODE_INDEX_INVALID != fei)
3437             {
3438               if (fib_entry_get_resolving_interface (fei) != ~0)
3439                 {
3440                   key.fib_index = outside_fib->fib_index;
3441                   break;
3442                 }
3443             }
3444         }
3445       /* *INDENT-ON* */
3446       break;
3447     }
3448   s->out2in = key;
3449   kv.key = key.as_u64;
3450   kv.value = s - tsm->sessions;
3451   if (clib_bihash_add_del_8_8 (&tsm->out2in, &kv, 1))
3452     nat_elog_warn ("out2in key add failed");
3453
3454   key.addr.as_u32 = in_addr->as_u32;
3455   key.port = in_port;
3456   key.fib_index = fib_index;
3457   s->in2out = key;
3458   kv.key = key.as_u64;
3459   if (clib_bihash_add_del_8_8 (&tsm->in2out, &kv, 1))
3460     nat_elog_warn ("in2out key add failed");
3461 }
3462
3463 void
3464 nat_ha_sdel_cb (ip4_address_t * out_addr, u16 out_port,
3465                 ip4_address_t * eh_addr, u16 eh_port, u8 proto, u32 fib_index,
3466                 u32 ti)
3467 {
3468   snat_main_t *sm = &snat_main;
3469   snat_session_key_t key;
3470   clib_bihash_kv_8_8_t kv, value;
3471   u32 thread_index;
3472   snat_session_t *s;
3473   snat_main_per_thread_data_t *tsm;
3474
3475   if (sm->num_workers > 1)
3476     thread_index =
3477       sm->first_worker_index +
3478       (sm->workers[(clib_net_to_host_u16 (out_port) -
3479                     1024) / sm->port_per_thread]);
3480   else
3481     thread_index = sm->num_workers;
3482   tsm = vec_elt_at_index (sm->per_thread_data, thread_index);
3483
3484   key.addr.as_u32 = out_addr->as_u32;
3485   key.port = out_port;
3486   key.protocol = proto;
3487   key.fib_index = fib_index;
3488   kv.key = key.as_u64;
3489   if (clib_bihash_search_8_8 (&tsm->out2in, &kv, &value))
3490     return;
3491
3492   s = pool_elt_at_index (tsm->sessions, value.value);
3493   nat_free_session_data (sm, s, thread_index, 1);
3494   nat44_delete_session (sm, s, thread_index);
3495 }
3496
3497 void
3498 nat_ha_sref_cb (ip4_address_t * out_addr, u16 out_port,
3499                 ip4_address_t * eh_addr, u16 eh_port, u8 proto, u32 fib_index,
3500                 u32 total_pkts, u64 total_bytes, u32 thread_index)
3501 {
3502   snat_main_t *sm = &snat_main;
3503   snat_session_key_t key;
3504   clib_bihash_kv_8_8_t kv, value;
3505   snat_session_t *s;
3506   snat_main_per_thread_data_t *tsm;
3507
3508   tsm = vec_elt_at_index (sm->per_thread_data, thread_index);
3509
3510   key.addr.as_u32 = out_addr->as_u32;
3511   key.port = out_port;
3512   key.protocol = proto;
3513   key.fib_index = fib_index;
3514   kv.key = key.as_u64;
3515   if (clib_bihash_search_8_8 (&tsm->out2in, &kv, &value))
3516     return;
3517
3518   s = pool_elt_at_index (tsm->sessions, value.value);
3519   s->total_pkts = total_pkts;
3520   s->total_bytes = total_bytes;
3521 }
3522
3523 void
3524 nat_ha_sadd_ed_cb (ip4_address_t * in_addr, u16 in_port,
3525                    ip4_address_t * out_addr, u16 out_port,
3526                    ip4_address_t * eh_addr, u16 eh_port,
3527                    ip4_address_t * ehn_addr, u16 ehn_port, u8 proto,
3528                    u32 fib_index, u16 flags, u32 thread_index)
3529 {
3530   snat_main_t *sm = &snat_main;
3531   snat_session_key_t key;
3532   snat_user_t *u;
3533   snat_session_t *s;
3534   clib_bihash_kv_16_8_t kv;
3535   f64 now = vlib_time_now (sm->vlib_main);
3536   nat_outside_fib_t *outside_fib;
3537   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
3538   snat_main_per_thread_data_t *tsm;
3539   fib_prefix_t pfx = {
3540     .fp_proto = FIB_PROTOCOL_IP4,
3541     .fp_len = 32,
3542     .fp_addr = {
3543                 .ip4.as_u32 = eh_addr->as_u32,
3544                 },
3545   };
3546
3547   tsm = vec_elt_at_index (sm->per_thread_data, thread_index);
3548
3549   key.addr.as_u32 = out_addr->as_u32;
3550   key.port = out_port;
3551   key.protocol = proto;
3552
3553   if (!(flags & SNAT_SESSION_FLAG_STATIC_MAPPING))
3554     {
3555       if (nat_set_outside_address_and_port
3556           (sm->addresses, thread_index, &key))
3557         return;
3558     }
3559
3560   key.addr.as_u32 = ehn_addr->as_u32;
3561   key.port = ehn_port;
3562   if (flags & SNAT_SESSION_FLAG_TWICE_NAT)
3563     {
3564       if (nat_set_outside_address_and_port
3565           (sm->twice_nat_addresses, thread_index, &key))
3566         return;
3567     }
3568
3569   u = nat_user_get_or_create (sm, in_addr, fib_index, thread_index);
3570   if (!u)
3571     return;
3572
3573   s = nat_ed_session_alloc (sm, u, thread_index, now);
3574   if (!s)
3575     return;
3576
3577   s->last_heard = now;
3578   s->flags = flags;
3579   s->ext_host_nat_addr.as_u32 = s->ext_host_addr.as_u32 = eh_addr->as_u32;
3580   s->ext_host_nat_port = s->ext_host_port = eh_port;
3581   if (is_twice_nat_session (s))
3582     {
3583       s->ext_host_nat_addr.as_u32 = ehn_addr->as_u32;
3584       s->ext_host_nat_port = ehn_port;
3585     }
3586   user_session_increment (sm, u, snat_is_session_static (s));
3587   switch (vec_len (sm->outside_fibs))
3588     {
3589     case 0:
3590       key.fib_index = sm->outside_fib_index;
3591       break;
3592     case 1:
3593       key.fib_index = sm->outside_fibs[0].fib_index;
3594       break;
3595     default:
3596       /* *INDENT-OFF* */
3597       vec_foreach (outside_fib, sm->outside_fibs)
3598         {
3599           fei = fib_table_lookup (outside_fib->fib_index, &pfx);
3600           if (FIB_NODE_INDEX_INVALID != fei)
3601             {
3602               if (fib_entry_get_resolving_interface (fei) != ~0)
3603                 {
3604                   key.fib_index = outside_fib->fib_index;
3605                   break;
3606                 }
3607             }
3608         }
3609       /* *INDENT-ON* */
3610       break;
3611     }
3612   key.addr.as_u32 = out_addr->as_u32;
3613   key.port = out_port;
3614   s->out2in = key;
3615   kv.value = s - tsm->sessions;
3616
3617   key.addr.as_u32 = in_addr->as_u32;
3618   key.port = in_port;
3619   key.fib_index = fib_index;
3620   s->in2out = key;
3621
3622   make_ed_kv (&kv, in_addr, &s->ext_host_nat_addr,
3623               snat_proto_to_ip_proto (proto), fib_index, in_port,
3624               s->ext_host_nat_port);
3625   if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &kv, 1))
3626     nat_elog_warn ("in2out key add failed");
3627
3628   make_ed_kv (&kv, out_addr, eh_addr, snat_proto_to_ip_proto (proto),
3629               s->out2in.fib_index, out_port, eh_port);
3630   if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &kv, 1))
3631     nat_elog_warn ("out2in key add failed");
3632 }
3633
3634 void
3635 nat_ha_sdel_ed_cb (ip4_address_t * out_addr, u16 out_port,
3636                    ip4_address_t * eh_addr, u16 eh_port, u8 proto,
3637                    u32 fib_index, u32 ti)
3638 {
3639   snat_main_t *sm = &snat_main;
3640   nat_ed_ses_key_t key;
3641   clib_bihash_kv_16_8_t kv, value;
3642   u32 thread_index;
3643   snat_session_t *s;
3644   snat_main_per_thread_data_t *tsm;
3645
3646   if (sm->num_workers > 1)
3647     thread_index =
3648       sm->first_worker_index +
3649       (sm->workers[(clib_net_to_host_u16 (out_port) -
3650                     1024) / sm->port_per_thread]);
3651   else
3652     thread_index = sm->num_workers;
3653   tsm = vec_elt_at_index (sm->per_thread_data, thread_index);
3654
3655   key.l_addr.as_u32 = out_addr->as_u32;
3656   key.l_port = out_port;
3657   key.r_addr.as_u32 = eh_addr->as_u32;
3658   key.r_port = eh_port;
3659   key.proto = proto;
3660   key.fib_index = fib_index;
3661   kv.key[0] = key.as_u64[0];
3662   kv.key[1] = key.as_u64[1];
3663   if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
3664     return;
3665
3666   s = pool_elt_at_index (tsm->sessions, value.value);
3667   nat_free_session_data (sm, s, thread_index, 1);
3668   nat44_delete_session (sm, s, thread_index);
3669 }
3670
3671 void
3672 nat_ha_sref_ed_cb (ip4_address_t * out_addr, u16 out_port,
3673                    ip4_address_t * eh_addr, u16 eh_port, u8 proto,
3674                    u32 fib_index, u32 total_pkts, u64 total_bytes,
3675                    u32 thread_index)
3676 {
3677   snat_main_t *sm = &snat_main;
3678   nat_ed_ses_key_t key;
3679   clib_bihash_kv_16_8_t kv, value;
3680   snat_session_t *s;
3681   snat_main_per_thread_data_t *tsm;
3682
3683   tsm = vec_elt_at_index (sm->per_thread_data, thread_index);
3684
3685   key.l_addr.as_u32 = out_addr->as_u32;
3686   key.l_port = out_port;
3687   key.r_addr.as_u32 = eh_addr->as_u32;
3688   key.r_port = eh_port;
3689   key.proto = proto;
3690   key.fib_index = fib_index;
3691   kv.key[0] = key.as_u64[0];
3692   kv.key[1] = key.as_u64[1];
3693   if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
3694     return;
3695
3696   s = pool_elt_at_index (tsm->sessions, value.value);
3697   s->total_pkts = total_pkts;
3698   s->total_bytes = total_bytes;
3699 }
3700
3701 static clib_error_t *
3702 snat_config (vlib_main_t * vm, unformat_input_t * input)
3703 {
3704   snat_main_t *sm = &snat_main;
3705   nat66_main_t *nm = &nat66_main;
3706   u32 translation_buckets = 1024;
3707   u32 translation_memory_size = 128 << 20;
3708   u32 user_buckets = 128;
3709   u32 user_memory_size = 64 << 20;
3710   u32 max_translations_per_user = 100;
3711   u32 outside_vrf_id = 0;
3712   u32 outside_ip6_vrf_id = 0;
3713   u32 inside_vrf_id = 0;
3714   u32 static_mapping_buckets = 1024;
3715   u32 static_mapping_memory_size = 64 << 20;
3716   u32 nat64_bib_buckets = 1024;
3717   u32 nat64_bib_memory_size = 128 << 20;
3718   u32 nat64_st_buckets = 2048;
3719   u32 nat64_st_memory_size = 256 << 20;
3720   u8 static_mapping_only = 0;
3721   u8 static_mapping_connection_tracking = 0;
3722   snat_main_per_thread_data_t *tsm;
3723   dslite_main_t *dm = &dslite_main;
3724
3725   sm->deterministic = 0;
3726   sm->out2in_dpo = 0;
3727   sm->endpoint_dependent = 0;
3728
3729   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3730     {
3731       if (unformat
3732           (input, "translation hash buckets %d", &translation_buckets))
3733         ;
3734       else if (unformat (input, "translation hash memory %d",
3735                          &translation_memory_size));
3736       else if (unformat (input, "user hash buckets %d", &user_buckets))
3737         ;
3738       else if (unformat (input, "user hash memory %d", &user_memory_size))
3739         ;
3740       else if (unformat (input, "max translations per user %d",
3741                          &max_translations_per_user))
3742         ;
3743       else if (unformat (input, "outside VRF id %d", &outside_vrf_id))
3744         ;
3745       else if (unformat (input, "outside ip6 VRF id %d", &outside_ip6_vrf_id))
3746         ;
3747       else if (unformat (input, "inside VRF id %d", &inside_vrf_id))
3748         ;
3749       else if (unformat (input, "static mapping only"))
3750         {
3751           static_mapping_only = 1;
3752           if (unformat (input, "connection tracking"))
3753             static_mapping_connection_tracking = 1;
3754         }
3755       else if (unformat (input, "deterministic"))
3756         sm->deterministic = 1;
3757       else if (unformat (input, "nat64 bib hash buckets %d",
3758                          &nat64_bib_buckets))
3759         ;
3760       else if (unformat (input, "nat64 bib hash memory %d",
3761                          &nat64_bib_memory_size))
3762         ;
3763       else
3764         if (unformat (input, "nat64 st hash buckets %d", &nat64_st_buckets))
3765         ;
3766       else if (unformat (input, "nat64 st hash memory %d",
3767                          &nat64_st_memory_size))
3768         ;
3769       else if (unformat (input, "out2in dpo"))
3770         sm->out2in_dpo = 1;
3771       else if (unformat (input, "dslite ce"))
3772         dslite_set_ce (dm, 1);
3773       else if (unformat (input, "endpoint-dependent"))
3774         sm->endpoint_dependent = 1;
3775       else
3776         return clib_error_return (0, "unknown input '%U'",
3777                                   format_unformat_error, input);
3778     }
3779
3780   if (sm->deterministic && sm->endpoint_dependent)
3781     return clib_error_return (0,
3782                               "deterministic and endpoint-dependent modes are mutually exclusive");
3783
3784   if (static_mapping_only && (sm->deterministic || sm->endpoint_dependent))
3785     return clib_error_return (0,
3786                               "static mapping only mode available only for simple nat");
3787
3788   if (sm->out2in_dpo && (sm->deterministic || sm->endpoint_dependent))
3789     return clib_error_return (0,
3790                               "out2in dpo mode available only for simple nat");
3791
3792   /* for show commands, etc. */
3793   sm->translation_buckets = translation_buckets;
3794   sm->translation_memory_size = translation_memory_size;
3795   /* do not exceed load factor 10 */
3796   sm->max_translations = 10 * translation_buckets;
3797   sm->user_buckets = user_buckets;
3798   sm->user_memory_size = user_memory_size;
3799   sm->max_translations_per_user = max_translations_per_user;
3800   sm->outside_vrf_id = outside_vrf_id;
3801   sm->outside_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4,
3802                                                              outside_vrf_id,
3803                                                              FIB_SOURCE_PLUGIN_HI);
3804   nm->outside_vrf_id = outside_ip6_vrf_id;
3805   nm->outside_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6,
3806                                                              outside_ip6_vrf_id,
3807                                                              FIB_SOURCE_PLUGIN_HI);
3808   sm->inside_vrf_id = inside_vrf_id;
3809   sm->inside_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4,
3810                                                             inside_vrf_id,
3811                                                             FIB_SOURCE_PLUGIN_HI);
3812   sm->static_mapping_only = static_mapping_only;
3813   sm->static_mapping_connection_tracking = static_mapping_connection_tracking;
3814
3815   nat64_set_hash (nat64_bib_buckets, nat64_bib_memory_size, nat64_st_buckets,
3816                   nat64_st_memory_size);
3817
3818   if (sm->deterministic)
3819     {
3820       sm->in2out_node_index = snat_det_in2out_node.index;
3821       sm->in2out_output_node_index = ~0;
3822       sm->out2in_node_index = snat_det_out2in_node.index;
3823       sm->icmp_match_in2out_cb = icmp_match_in2out_det;
3824       sm->icmp_match_out2in_cb = icmp_match_out2in_det;
3825     }
3826   else
3827     {
3828       if (sm->endpoint_dependent)
3829         {
3830           sm->worker_in2out_cb = nat44_ed_get_worker_in2out_cb;
3831           sm->worker_out2in_cb = nat44_ed_get_worker_out2in_cb;
3832           sm->in2out_node_index = nat44_ed_in2out_node.index;
3833           sm->in2out_output_node_index = nat44_ed_in2out_output_node.index;
3834           sm->out2in_node_index = nat44_ed_out2in_node.index;
3835           sm->icmp_match_in2out_cb = icmp_match_in2out_ed;
3836           sm->icmp_match_out2in_cb = icmp_match_out2in_ed;
3837           nat_affinity_init (vm);
3838           nat_ha_init (vm, nat_ha_sadd_ed_cb, nat_ha_sdel_ed_cb,
3839                        nat_ha_sref_ed_cb);
3840         }
3841       else
3842         {
3843           sm->worker_in2out_cb = snat_get_worker_in2out_cb;
3844           sm->worker_out2in_cb = snat_get_worker_out2in_cb;
3845           sm->in2out_node_index = snat_in2out_node.index;
3846           sm->in2out_output_node_index = snat_in2out_output_node.index;
3847           sm->out2in_node_index = snat_out2in_node.index;
3848           sm->icmp_match_in2out_cb = icmp_match_in2out_slow;
3849           sm->icmp_match_out2in_cb = icmp_match_out2in_slow;
3850           nat_ha_init (vm, nat_ha_sadd_cb, nat_ha_sdel_cb, nat_ha_sref_cb);
3851         }
3852       if (!static_mapping_only ||
3853           (static_mapping_only && static_mapping_connection_tracking))
3854         {
3855           /* *INDENT-OFF* */
3856           vec_foreach (tsm, sm->per_thread_data)
3857             {
3858               if (sm->endpoint_dependent)
3859                 {
3860                   clib_bihash_init_16_8 (&tsm->in2out_ed, "in2out-ed",
3861                                          translation_buckets,
3862                                          translation_memory_size);
3863                   clib_bihash_set_kvp_format_fn_16_8 (&tsm->in2out_ed,
3864                                                       format_ed_session_kvp);
3865
3866                   clib_bihash_init_16_8 (&tsm->out2in_ed, "out2in-ed",
3867                                          translation_buckets,
3868                                          translation_memory_size);
3869                   clib_bihash_set_kvp_format_fn_16_8 (&tsm->out2in_ed,
3870                                                       format_ed_session_kvp);
3871                 }
3872               else
3873                 {
3874                   clib_bihash_init_8_8 (&tsm->in2out, "in2out",
3875                                         translation_buckets,
3876                                         translation_memory_size);
3877                   clib_bihash_set_kvp_format_fn_8_8 (&tsm->in2out,
3878                                                      format_session_kvp);
3879
3880                   clib_bihash_init_8_8 (&tsm->out2in, "out2in",
3881                                         translation_buckets,
3882                                         translation_memory_size);
3883                   clib_bihash_set_kvp_format_fn_8_8 (&tsm->out2in,
3884                                                      format_session_kvp);
3885                 }
3886
3887               clib_bihash_init_8_8 (&tsm->user_hash, "users", user_buckets,
3888                                     user_memory_size);
3889               clib_bihash_set_kvp_format_fn_8_8 (&tsm->user_hash,
3890                                                  format_user_kvp);
3891             }
3892           /* *INDENT-ON* */
3893
3894         }
3895       else
3896         {
3897           sm->icmp_match_in2out_cb = icmp_match_in2out_fast;
3898           sm->icmp_match_out2in_cb = icmp_match_out2in_fast;
3899         }
3900       clib_bihash_init_8_8 (&sm->static_mapping_by_local,
3901                             "static_mapping_by_local", static_mapping_buckets,
3902                             static_mapping_memory_size);
3903       clib_bihash_set_kvp_format_fn_8_8 (&sm->static_mapping_by_local,
3904                                          format_static_mapping_kvp);
3905
3906       clib_bihash_init_8_8 (&sm->static_mapping_by_external,
3907                             "static_mapping_by_external",
3908                             static_mapping_buckets,
3909                             static_mapping_memory_size);
3910       clib_bihash_set_kvp_format_fn_8_8 (&sm->static_mapping_by_external,
3911                                          format_static_mapping_kvp);
3912     }
3913
3914   return 0;
3915 }
3916
3917 VLIB_CONFIG_FUNCTION (snat_config, "nat");
3918
3919 static void
3920 nat_ip4_add_del_addr_only_sm_cb (ip4_main_t * im,
3921                                  uword opaque,
3922                                  u32 sw_if_index,
3923                                  ip4_address_t * address,
3924                                  u32 address_length,
3925                                  u32 if_address_index, u32 is_delete)
3926 {
3927   snat_main_t *sm = &snat_main;
3928   snat_static_map_resolve_t *rp;
3929   snat_static_mapping_t *m;
3930   snat_session_key_t m_key;
3931   clib_bihash_kv_8_8_t kv, value;
3932   int i, rv;
3933   ip4_address_t l_addr;
3934
3935   for (i = 0; i < vec_len (sm->to_resolve); i++)
3936     {
3937       rp = sm->to_resolve + i;
3938       if (rp->addr_only == 0)
3939         continue;
3940       if (rp->sw_if_index == sw_if_index)
3941         goto match;
3942     }
3943
3944   return;
3945
3946 match:
3947   m_key.addr.as_u32 = address->as_u32;
3948   m_key.port = rp->addr_only ? 0 : rp->e_port;
3949   m_key.protocol = rp->addr_only ? 0 : rp->proto;
3950   m_key.fib_index = sm->outside_fib_index;
3951   kv.key = m_key.as_u64;
3952   if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
3953     m = 0;
3954   else
3955     m = pool_elt_at_index (sm->static_mappings, value.value);
3956
3957   if (!is_delete)
3958     {
3959       /* Don't trip over lease renewal, static config */
3960       if (m)
3961         return;
3962     }
3963   else
3964     {
3965       if (!m)
3966         return;
3967     }
3968
3969   /* Indetity mapping? */
3970   if (rp->l_addr.as_u32 == 0)
3971     l_addr.as_u32 = address[0].as_u32;
3972   else
3973     l_addr.as_u32 = rp->l_addr.as_u32;
3974   /* Add the static mapping */
3975   rv = snat_add_static_mapping (l_addr,
3976                                 address[0],
3977                                 rp->l_port,
3978                                 rp->e_port,
3979                                 rp->vrf_id,
3980                                 rp->addr_only, ~0 /* sw_if_index */ ,
3981                                 rp->proto, !is_delete, rp->twice_nat,
3982                                 rp->out2in_only, rp->tag, rp->identity_nat);
3983   if (rv)
3984     nat_elog_notice_X1 ("snat_add_static_mapping returned %d", "i4", rv);
3985 }
3986
3987 static void
3988 snat_ip4_add_del_interface_address_cb (ip4_main_t * im,
3989                                        uword opaque,
3990                                        u32 sw_if_index,
3991                                        ip4_address_t * address,
3992                                        u32 address_length,
3993                                        u32 if_address_index, u32 is_delete)
3994 {
3995   snat_main_t *sm = &snat_main;
3996   snat_static_map_resolve_t *rp;
3997   ip4_address_t l_addr;
3998   int i, j;
3999   int rv;
4000   u8 twice_nat = 0;
4001   snat_address_t *addresses = sm->addresses;
4002
4003   for (i = 0; i < vec_len (sm->auto_add_sw_if_indices); i++)
4004     {
4005       if (sw_if_index == sm->auto_add_sw_if_indices[i])
4006         goto match;
4007     }
4008
4009   for (i = 0; i < vec_len (sm->auto_add_sw_if_indices_twice_nat); i++)
4010     {
4011       twice_nat = 1;
4012       addresses = sm->twice_nat_addresses;
4013       if (sw_if_index == sm->auto_add_sw_if_indices_twice_nat[i])
4014         goto match;
4015     }
4016
4017   return;
4018
4019 match:
4020   if (!is_delete)
4021     {
4022       /* Don't trip over lease renewal, static config */
4023       for (j = 0; j < vec_len (addresses); j++)
4024         if (addresses[j].addr.as_u32 == address->as_u32)
4025           return;
4026
4027       (void) snat_add_address (sm, address, ~0, twice_nat);
4028       /* Scan static map resolution vector */
4029       for (j = 0; j < vec_len (sm->to_resolve); j++)
4030         {
4031           rp = sm->to_resolve + j;
4032           if (rp->addr_only)
4033             continue;
4034           /* On this interface? */
4035           if (rp->sw_if_index == sw_if_index)
4036             {
4037               /* Indetity mapping? */
4038               if (rp->l_addr.as_u32 == 0)
4039                 l_addr.as_u32 = address[0].as_u32;
4040               else
4041                 l_addr.as_u32 = rp->l_addr.as_u32;
4042               /* Add the static mapping */
4043               rv = snat_add_static_mapping (l_addr,
4044                                             address[0],
4045                                             rp->l_port,
4046                                             rp->e_port,
4047                                             rp->vrf_id,
4048                                             rp->addr_only,
4049                                             ~0 /* sw_if_index */ ,
4050                                             rp->proto,
4051                                             rp->is_add, rp->twice_nat,
4052                                             rp->out2in_only, rp->tag,
4053                                             rp->identity_nat);
4054               if (rv)
4055                 nat_elog_notice_X1 ("snat_add_static_mapping returned %d",
4056                                     "i4", rv);
4057             }
4058         }
4059       return;
4060     }
4061   else
4062     {
4063       (void) snat_del_address (sm, address[0], 1, twice_nat);
4064       return;
4065     }
4066 }
4067
4068
4069 int
4070 snat_add_interface_address (snat_main_t * sm, u32 sw_if_index, int is_del,
4071                             u8 twice_nat)
4072 {
4073   ip4_main_t *ip4_main = sm->ip4_main;
4074   ip4_address_t *first_int_addr;
4075   snat_static_map_resolve_t *rp;
4076   u32 *indices_to_delete = 0;
4077   int i, j;
4078   u32 *auto_add_sw_if_indices =
4079     twice_nat ? sm->
4080     auto_add_sw_if_indices_twice_nat : sm->auto_add_sw_if_indices;
4081
4082   first_int_addr = ip4_interface_first_address (ip4_main, sw_if_index, 0        /* just want the address */
4083     );
4084
4085   for (i = 0; i < vec_len (auto_add_sw_if_indices); i++)
4086     {
4087       if (auto_add_sw_if_indices[i] == sw_if_index)
4088         {
4089           if (is_del)
4090             {
4091               /* if have address remove it */
4092               if (first_int_addr)
4093                 (void) snat_del_address (sm, first_int_addr[0], 1, twice_nat);
4094               else
4095                 {
4096                   for (j = 0; j < vec_len (sm->to_resolve); j++)
4097                     {
4098                       rp = sm->to_resolve + j;
4099                       if (rp->sw_if_index == sw_if_index)
4100                         vec_add1 (indices_to_delete, j);
4101                     }
4102                   if (vec_len (indices_to_delete))
4103                     {
4104                       for (j = vec_len (indices_to_delete) - 1; j >= 0; j--)
4105                         vec_del1 (sm->to_resolve, j);
4106                       vec_free (indices_to_delete);
4107                     }
4108                 }
4109               if (twice_nat)
4110                 vec_del1 (sm->auto_add_sw_if_indices_twice_nat, i);
4111               else
4112                 vec_del1 (sm->auto_add_sw_if_indices, i);
4113             }
4114           else
4115             return VNET_API_ERROR_VALUE_EXIST;
4116
4117           return 0;
4118         }
4119     }
4120
4121   if (is_del)
4122     return VNET_API_ERROR_NO_SUCH_ENTRY;
4123
4124   /* add to the auto-address list */
4125   if (twice_nat)
4126     vec_add1 (sm->auto_add_sw_if_indices_twice_nat, sw_if_index);
4127   else
4128     vec_add1 (sm->auto_add_sw_if_indices, sw_if_index);
4129
4130   /* If the address is already bound - or static - add it now */
4131   if (first_int_addr)
4132     (void) snat_add_address (sm, first_int_addr, ~0, twice_nat);
4133
4134   return 0;
4135 }
4136
4137 int
4138 nat44_del_session (snat_main_t * sm, ip4_address_t * addr, u16 port,
4139                    snat_protocol_t proto, u32 vrf_id, int is_in)
4140 {
4141   snat_main_per_thread_data_t *tsm;
4142   clib_bihash_kv_8_8_t kv, value;
4143   ip4_header_t ip;
4144   u32 fib_index = fib_table_find (FIB_PROTOCOL_IP4, vrf_id);
4145   snat_session_key_t key;
4146   snat_session_t *s;
4147   clib_bihash_8_8_t *t;
4148
4149   if (sm->endpoint_dependent)
4150     return VNET_API_ERROR_UNSUPPORTED;
4151
4152   ip.dst_address.as_u32 = ip.src_address.as_u32 = addr->as_u32;
4153   if (sm->num_workers > 1)
4154     tsm =
4155       vec_elt_at_index (sm->per_thread_data,
4156                         sm->worker_in2out_cb (&ip, fib_index, 0));
4157   else
4158     tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
4159
4160   key.addr.as_u32 = addr->as_u32;
4161   key.port = clib_host_to_net_u16 (port);
4162   key.protocol = proto;
4163   key.fib_index = fib_index;
4164   kv.key = key.as_u64;
4165   t = is_in ? &tsm->in2out : &tsm->out2in;
4166   if (!clib_bihash_search_8_8 (t, &kv, &value))
4167     {
4168       if (pool_is_free_index (tsm->sessions, value.value))
4169         return VNET_API_ERROR_UNSPECIFIED;
4170
4171       s = pool_elt_at_index (tsm->sessions, value.value);
4172       nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0);
4173       nat44_delete_session (sm, s, tsm - sm->per_thread_data);
4174       return 0;
4175     }
4176
4177   return VNET_API_ERROR_NO_SUCH_ENTRY;
4178 }
4179
4180 int
4181 nat44_del_ed_session (snat_main_t * sm, ip4_address_t * addr, u16 port,
4182                       ip4_address_t * eh_addr, u16 eh_port, u8 proto,
4183                       u32 vrf_id, int is_in)
4184 {
4185   ip4_header_t ip;
4186   clib_bihash_16_8_t *t;
4187   nat_ed_ses_key_t key;
4188   clib_bihash_kv_16_8_t kv, value;
4189   u32 fib_index = fib_table_find (FIB_PROTOCOL_IP4, vrf_id);
4190   snat_session_t *s;
4191   snat_main_per_thread_data_t *tsm;
4192
4193   if (!sm->endpoint_dependent)
4194     return VNET_API_ERROR_FEATURE_DISABLED;
4195
4196   ip.dst_address.as_u32 = ip.src_address.as_u32 = addr->as_u32;
4197   if (sm->num_workers > 1)
4198     tsm =
4199       vec_elt_at_index (sm->per_thread_data,
4200                         sm->worker_in2out_cb (&ip, fib_index, 0));
4201   else
4202     tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
4203
4204   t = is_in ? &tsm->in2out_ed : &tsm->out2in_ed;
4205   key.l_addr.as_u32 = addr->as_u32;
4206   key.r_addr.as_u32 = eh_addr->as_u32;
4207   key.l_port = clib_host_to_net_u16 (port);
4208   key.r_port = clib_host_to_net_u16 (eh_port);
4209   key.proto = proto;
4210   key.fib_index = fib_index;
4211   kv.key[0] = key.as_u64[0];
4212   kv.key[1] = key.as_u64[1];
4213   if (clib_bihash_search_16_8 (t, &kv, &value))
4214     return VNET_API_ERROR_NO_SUCH_ENTRY;
4215
4216   if (pool_is_free_index (tsm->sessions, value.value))
4217     return VNET_API_ERROR_UNSPECIFIED;
4218   s = pool_elt_at_index (tsm->sessions, value.value);
4219   nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0);
4220   nat44_delete_session (sm, s, tsm - sm->per_thread_data);
4221   return 0;
4222 }
4223
4224 void
4225 nat_set_alloc_addr_and_port_mape (u16 psid, u16 psid_offset, u16 psid_length)
4226 {
4227   snat_main_t *sm = &snat_main;
4228
4229   sm->addr_and_port_alloc_alg = NAT_ADDR_AND_PORT_ALLOC_ALG_MAPE;
4230   sm->alloc_addr_and_port = nat_alloc_addr_and_port_mape;
4231   sm->psid = psid;
4232   sm->psid_offset = psid_offset;
4233   sm->psid_length = psid_length;
4234 }
4235
4236 void
4237 nat_set_alloc_addr_and_port_range (u16 start_port, u16 end_port)
4238 {
4239   snat_main_t *sm = &snat_main;
4240
4241   sm->addr_and_port_alloc_alg = NAT_ADDR_AND_PORT_ALLOC_ALG_RANGE;
4242   sm->alloc_addr_and_port = nat_alloc_addr_and_port_range;
4243   sm->start_port = start_port;
4244   sm->end_port = end_port;
4245 }
4246
4247 void
4248 nat_set_alloc_addr_and_port_default (void)
4249 {
4250   snat_main_t *sm = &snat_main;
4251
4252   sm->addr_and_port_alloc_alg = NAT_ADDR_AND_PORT_ALLOC_ALG_DEFAULT;
4253   sm->alloc_addr_and_port = nat_alloc_addr_and_port_default;
4254 }
4255
4256 /*
4257  * fd.io coding-style-patch-verification: ON
4258  *
4259  * Local Variables:
4260  * eval: (c-set-style "gnu")
4261  * End:
4262  */