src/plugins/nat/nat44-ei/nat44_ei.c

   1 /*
   2  * nat44_ei.c - nat44 endpoint dependent plugin
   3  *
   4  * Copyright (c) 2020 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, WITHOUT
  13  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  14  * License for the specific language governing permissions and limitations
  15  * under the License.
  16  */
  17
  18 #include <vnet/plugin/plugin.h>
  19 #include <vpp/app/version.h>
  20
  21 #include <vnet/vnet.h>
  22 #include <vnet/ip/ip.h>
  23 #include <vnet/ip/ip4.h>
  24 #include <vnet/ip/ip_table.h>
  25 #include <vnet/ip/reass/ip4_sv_reass.h>
  26 #include <vnet/fib/fib_table.h>
  27 #include <vnet/fib/ip4_fib.h>
  28 #include <vnet/plugin/plugin.h>
  29
  30 // nat lib
  31 #include <nat/lib/log.h>
  32 #include <nat/lib/nat_syslog.h>
  33 #include <nat/lib/nat_inlines.h>
  34 #include <nat/lib/ipfix_logging.h>
  35
  36 #include <nat/nat44-ei/nat44_ei_dpo.h>
  37 #include <nat/nat44-ei/nat44_ei_inlines.h>
  38 #include <nat/nat44-ei/nat44_ei.h>
  39
  40 nat44_ei_main_t nat44_ei_main;
  41
  42 extern vlib_node_registration_t nat44_ei_hairpinning_node;
  43 extern vlib_node_registration_t nat44_ei_hairpin_dst_node;
  44 extern vlib_node_registration_t
  45   nat44_ei_in2out_hairpinning_finish_ip4_lookup_node;
  46 extern vlib_node_registration_t
  47   nat44_ei_in2out_hairpinning_finish_interface_output_node;
  48
  49 #define skip_if_disabled()                                                    \
  50   do                                                                          \
  51     {                                                                         \
  52       nat44_ei_main_t *nm = &nat44_ei_main;                                   \
  53       if (PREDICT_FALSE (!nm->enabled))                                       \
  54         return;                                                               \
  55     }                                                                         \
  56   while (0)
  57
  58 #define fail_if_enabled()                                                     \
  59   do                                                                          \
  60     {                                                                         \
  61       nat44_ei_main_t *nm = &nat44_ei_main;                                   \
  62       if (PREDICT_FALSE (nm->enabled))                                        \
  63         {                                                                     \
  64           nat44_ei_log_err ("plugin enabled");                                \
  65           return 1;                                                           \
  66         }                                                                     \
  67     }                                                                         \
  68   while (0)
  69
  70 #define fail_if_disabled()                                                    \
  71   do                                                                          \
  72     {                                                                         \
  73       nat44_ei_main_t *nm = &nat44_ei_main;                                   \
  74       if (PREDICT_FALSE (!nm->enabled))                                       \
  75         {                                                                     \
  76           nat44_ei_log_err ("plugin disabled");                               \
  77           return 1;                                                           \
  78         }                                                                     \
  79     }                                                                         \
  80   while (0)
  81
  82 /* Hook up input features */
  83 VNET_FEATURE_INIT (ip4_nat_classify, static) = {
  84   .arc_name = "ip4-unicast",
  85   .node_name = "nat44-ei-classify",
  86   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
  87                                "ip4-sv-reassembly-feature"),
  88 };
  89 VNET_FEATURE_INIT (ip4_nat_handoff_classify, static) = {
  90   .arc_name = "ip4-unicast",
  91   .node_name = "nat44-ei-handoff-classify",
  92   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
  93                                "ip4-sv-reassembly-feature"),
  94 };
  95 VNET_FEATURE_INIT (ip4_nat44_ei_in2out, static) = {
  96   .arc_name = "ip4-unicast",
  97   .node_name = "nat44-ei-in2out",
  98   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
  99                                "ip4-sv-reassembly-feature"),
 100 };
 101 VNET_FEATURE_INIT (ip4_nat44_ei_out2in, static) = {
 102   .arc_name = "ip4-unicast",
 103   .node_name = "nat44-ei-out2in",
 104   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
 105                                "ip4-sv-reassembly-feature",
 106                                "ip4-dhcp-client-detect"),
 107 };
 108 VNET_FEATURE_INIT (ip4_nat44_ei_in2out_output, static) = {
 109   .arc_name = "ip4-output",
 110   .node_name = "nat44-ei-in2out-output",
 111   .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa",
 112                                "ip4-sv-reassembly-output-feature"),
 113 };
 114 VNET_FEATURE_INIT (ip4_nat44_ei_in2out_fast, static) = {
 115   .arc_name = "ip4-unicast",
 116   .node_name = "nat44-ei-in2out-fast",
 117   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
 118                                "ip4-sv-reassembly-feature"),
 119 };
 120 VNET_FEATURE_INIT (ip4_nat44_ei_out2in_fast, static) = {
 121   .arc_name = "ip4-unicast",
 122   .node_name = "nat44-ei-out2in-fast",
 123   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
 124                                "ip4-sv-reassembly-feature",
 125                                "ip4-dhcp-client-detect"),
 126 };
 127 VNET_FEATURE_INIT (ip4_nat44_ei_hairpin_dst, static) = {
 128   .arc_name = "ip4-unicast",
 129   .node_name = "nat44-ei-hairpin-dst",
 130   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
 131                                "ip4-sv-reassembly-feature"),
 132 };
 133 VNET_FEATURE_INIT (ip4_nat44_ei_hairpin_src, static) = {
 134   .arc_name = "ip4-output",
 135   .node_name = "nat44-ei-hairpin-src",
 136   .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa",
 137                                "ip4-sv-reassembly-output-feature"),
 138 };
 139 VNET_FEATURE_INIT (ip4_nat44_ei_hairpinning, static) = {
 140   .arc_name = "ip4-local",
 141   .node_name = "nat44-ei-hairpinning",
 142   .runs_before = VNET_FEATURES ("ip4-local-end-of-arc"),
 143 };
 144 VNET_FEATURE_INIT (ip4_nat44_ei_in2out_worker_handoff, static) = {
 145   .arc_name = "ip4-unicast",
 146   .node_name = "nat44-ei-in2out-worker-handoff",
 147   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
 148 };
 149 VNET_FEATURE_INIT (ip4_nat44_ei_out2in_worker_handoff, static) = {
 150   .arc_name = "ip4-unicast",
 151   .node_name = "nat44-ei-out2in-worker-handoff",
 152   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
 153                                "ip4-dhcp-client-detect"),
 154 };
 155 VNET_FEATURE_INIT (ip4_nat44_ei_in2out_output_worker_handoff, static) = {
 156   .arc_name = "ip4-output",
 157   .node_name = "nat44-ei-in2out-output-worker-handoff",
 158   .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa",
 159                                "ip4-sv-reassembly-output-feature"),
 160 };
 161
 162 VLIB_PLUGIN_REGISTER () = {
 163   .version = VPP_BUILD_VER,
 164   .description = "IPv4 Endpoint-Independent NAT (NAT44 EI)",
 165 };
 166
 167 #define foreach_nat44_ei_classify_error                                       \
 168   _ (NEXT_IN2OUT, "next in2out")                                              \
 169   _ (NEXT_OUT2IN, "next out2in")                                              \
 170   _ (FRAG_CACHED, "fragment cached")
 171
 172 typedef enum
 173 {
 174 #define _(sym, str) NAT44_EI_CLASSIFY_ERROR_##sym,
 175   foreach_nat44_ei_classify_error
 176 #undef _
 177     NAT44_EI_CLASSIFY_N_ERROR,
 178 } nat44_ei_classify_error_t;
 179
 180 static char *nat44_ei_classify_error_strings[] = {
 181 #define _(sym, string) string,
 182   foreach_nat44_ei_classify_error
 183 #undef _
 184 };
 185
 186 typedef enum
 187 {
 188   NAT44_EI_CLASSIFY_NEXT_IN2OUT,
 189   NAT44_EI_CLASSIFY_NEXT_OUT2IN,
 190   NAT44_EI_CLASSIFY_NEXT_DROP,
 191   NAT44_EI_CLASSIFY_N_NEXT,
 192 } nat44_ei_classify_next_t;
 193
 194 typedef struct
 195 {
 196   u8 next_in2out;
 197   u8 cached;
 198 } nat44_ei_classify_trace_t;
 199
 200 void nat44_ei_add_del_addr_to_fib (ip4_address_t *addr, u8 p_len,
 201                                    u32 sw_if_index, int is_add);
 202
 203 static u8 *
 204 format_nat44_ei_classify_trace (u8 *s, va_list *args)
 205 {
 206   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 207   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 208   nat44_ei_classify_trace_t *t = va_arg (*args, nat44_ei_classify_trace_t *);
 209   char *next;
 210
 211   if (t->cached)
 212     s = format (s, "nat44-ei-classify: fragment cached");
 213   else
 214     {
 215       next = t->next_in2out ? "nat44-ei-in2out" : "nat44-ei-out2in";
 216       s = format (s, "nat44-ei-classify: next %s", next);
 217     }
 218
 219   return s;
 220 }
 221
 222 static void nat44_ei_db_free ();
 223
 224 static void nat44_ei_db_init (u32 translations, u32 translation_buckets,
 225                               u32 user_buckets);
 226
 227 static void nat44_ei_ip4_add_del_interface_address_cb (
 228   ip4_main_t *im, uword opaque, u32 sw_if_index, ip4_address_t *address,
 229   u32 address_length, u32 if_address_index, u32 is_delete);
 230
 231 static void nat44_ei_ip4_add_del_addr_only_sm_cb (
 232   ip4_main_t *im, uword opaque, u32 sw_if_index, ip4_address_t *address,
 233   u32 address_length, u32 if_address_index, u32 is_delete);
 234
 235 static void nat44_ei_update_outside_fib (ip4_main_t *im, uword opaque,
 236                                          u32 sw_if_index, u32 new_fib_index,
 237                                          u32 old_fib_index);
 238
 239 void
 240 nat44_ei_set_node_indexes (nat44_ei_main_t *nm, vlib_main_t *vm)
 241 {
 242   vlib_node_t *node;
 243   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ei-out2in");
 244   nm->out2in_node_index = node->index;
 245   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ei-in2out");
 246   nm->in2out_node_index = node->index;
 247   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ei-in2out-output");
 248   nm->in2out_output_node_index = node->index;
 249 }
 250
 251 int
 252 nat44_ei_set_workers (uword *bitmap)
 253 {
 254   nat44_ei_main_t *nm = &nat44_ei_main;
 255   int i, j = 0;
 256
 257   if (nm->num_workers < 2)
 258     return VNET_API_ERROR_FEATURE_DISABLED;
 259
 260   if (clib_bitmap_last_set (bitmap) >= nm->num_workers)
 261     return VNET_API_ERROR_INVALID_WORKER;
 262
 263   vec_free (nm->workers);
 264   clib_bitmap_foreach (i, bitmap)
 265     {
 266       vec_add1 (nm->workers, i);
 267       nm->per_thread_data[nm->first_worker_index + i].snat_thread_index = j;
 268       nm->per_thread_data[nm->first_worker_index + i].thread_index = i;
 269       j++;
 270     }
 271
 272   nm->port_per_thread = (0xffff - 1024) / _vec_len (nm->workers);
 273
 274   return 0;
 275 }
 276
 277 #define nat_validate_simple_counter(c, i)                                     \
 278   do                                                                          \
 279     {                                                                         \
 280       vlib_validate_simple_counter (&c, i);                                   \
 281       vlib_zero_simple_counter (&c, i);                                       \
 282     }                                                                         \
 283   while (0);
 284
 285 #define nat_init_simple_counter(c, n, sn)                                     \
 286   do                                                                          \
 287     {                                                                         \
 288       c.name = n;                                                             \
 289       c.stat_segment_name = sn;                                               \
 290       nat_validate_simple_counter (c, 0);                                     \
 291     }                                                                         \
 292   while (0);
 293
 294 static_always_inline void
 295 nat_validate_interface_counters (nat44_ei_main_t *nm, u32 sw_if_index)
 296 {
 297 #define _(x)                                                                  \
 298   nat_validate_simple_counter (nm->counters.fastpath.in2out.x, sw_if_index);  \
 299   nat_validate_simple_counter (nm->counters.fastpath.out2in.x, sw_if_index);  \
 300   nat_validate_simple_counter (nm->counters.slowpath.in2out.x, sw_if_index);  \
 301   nat_validate_simple_counter (nm->counters.slowpath.out2in.x, sw_if_index);
 302   foreach_nat_counter;
 303 #undef _
 304   nat_validate_simple_counter (nm->counters.hairpinning, sw_if_index);
 305 }
 306
 307 clib_error_t *
 308 nat44_ei_init (vlib_main_t *vm)
 309 {
 310   nat44_ei_main_t *nm = &nat44_ei_main;
 311   vlib_thread_main_t *tm = vlib_get_thread_main ();
 312   vlib_thread_registration_t *tr;
 313   ip4_add_del_interface_address_callback_t cbi = { 0 };
 314   ip4_table_bind_callback_t cbt = { 0 };
 315   u32 i, num_threads = 0;
 316   uword *p, *bitmap = 0;
 317
 318   clib_memset (nm, 0, sizeof (*nm));
 319
 320   // required
 321   nm->vnet_main = vnet_get_main ();
 322   // convenience
 323   nm->ip4_main = &ip4_main;
 324   nm->api_main = vlibapi_get_main ();
 325   nm->ip4_lookup_main = &ip4_main.lookup_main;
 326
 327   // handoff stuff
 328   nm->fq_out2in_index = ~0;
 329   nm->fq_in2out_index = ~0;
 330   nm->fq_in2out_output_index = ~0;
 331
 332   nm->log_level = NAT_LOG_ERROR;
 333
 334   nat44_ei_set_node_indexes (nm, vm);
 335   nm->log_class = vlib_log_register_class ("nat44-ei", 0);
 336
 337   nat_init_simple_counter (nm->total_users, "total-users",
 338                            "/nat44-ei/total-users");
 339   nat_init_simple_counter (nm->total_sessions, "total-sessions",
 340                            "/nat44-ei/total-sessions");
 341   nat_init_simple_counter (nm->user_limit_reached, "user-limit-reached",
 342                            "/nat44-ei/user-limit-reached");
 343
 344 #define _(x)                                                                  \
 345   nat_init_simple_counter (nm->counters.fastpath.in2out.x, #x,                \
 346                            "/nat44-ei/in2out/fastpath/" #x);                  \
 347   nat_init_simple_counter (nm->counters.fastpath.out2in.x, #x,                \
 348                            "/nat44-ei/out2in/fastpath/" #x);                  \
 349   nat_init_simple_counter (nm->counters.slowpath.in2out.x, #x,                \
 350                            "/nat44-ei/in2out/slowpath/" #x);                  \
 351   nat_init_simple_counter (nm->counters.slowpath.out2in.x, #x,                \
 352                            "/nat44-ei/out2in/slowpath/" #x);
 353   foreach_nat_counter;
 354 #undef _
 355   nat_init_simple_counter (nm->counters.hairpinning, "hairpinning",
 356                            "/nat44-ei/hairpinning");
 357
 358   p = hash_get_mem (tm->thread_registrations_by_name, "workers");
 359   if (p)
 360     {
 361       tr = (vlib_thread_registration_t *) p[0];
 362       if (tr)
 363         {
 364           nm->num_workers = tr->count;
 365           nm->first_worker_index = tr->first_index;
 366         }
 367     }
 368   num_threads = tm->n_vlib_mains - 1;
 369   nm->port_per_thread = 0xffff - 1024;
 370   vec_validate (nm->per_thread_data, num_threads);
 371
 372   /* Use all available workers by default */
 373   if (nm->num_workers > 1)
 374     {
 375
 376       for (i = 0; i < nm->num_workers; i++)
 377         bitmap = clib_bitmap_set (bitmap, i, 1);
 378       nat44_ei_set_workers (bitmap);
 379       clib_bitmap_free (bitmap);
 380     }
 381   else
 382     nm->per_thread_data[0].snat_thread_index = 0;
 383
 384   /* callbacks to call when interface address changes. */
 385   cbi.function = nat44_ei_ip4_add_del_interface_address_cb;
 386   vec_add1 (nm->ip4_main->add_del_interface_address_callbacks, cbi);
 387   cbi.function = nat44_ei_ip4_add_del_addr_only_sm_cb;
 388   vec_add1 (nm->ip4_main->add_del_interface_address_callbacks, cbi);
 389
 390   /* callbacks to call when interface to table biding changes */
 391   cbt.function = nat44_ei_update_outside_fib;
 392   vec_add1 (nm->ip4_main->table_bind_callbacks, cbt);
 393
 394   nm->fib_src_low = fib_source_allocate (
 395     "nat44-ei-low", FIB_SOURCE_PRIORITY_LOW, FIB_SOURCE_BH_SIMPLE);
 396   nm->fib_src_hi = fib_source_allocate ("nat44-ei-hi", FIB_SOURCE_PRIORITY_HI,
 397                                         FIB_SOURCE_BH_SIMPLE);
 398
 399   // used only by out2in-dpo feature
 400   nat_dpo_module_init ();
 401   nat_ha_init (vm, nm->num_workers, num_threads);
 402
 403   nm->hairpinning_fq_index =
 404     vlib_frame_queue_main_init (nat44_ei_hairpinning_node.index, 0);
 405   nm->hairpin_dst_fq_index =
 406     vlib_frame_queue_main_init (nat44_ei_hairpin_dst_node.index, 0);
 407   nm->in2out_hairpinning_finish_ip4_lookup_node_fq_index =
 408     vlib_frame_queue_main_init (
 409       nat44_ei_in2out_hairpinning_finish_ip4_lookup_node.index, 0);
 410   nm->in2out_hairpinning_finish_interface_output_node_fq_index =
 411     vlib_frame_queue_main_init (
 412       nat44_ei_in2out_hairpinning_finish_interface_output_node.index, 0);
 413   return nat44_ei_api_hookup (vm);
 414 }
 415
 416 VLIB_INIT_FUNCTION (nat44_ei_init);
 417
 418 int
 419 nat44_ei_plugin_enable (nat44_ei_config_t c)
 420 {
 421   nat44_ei_main_t *nm = &nat44_ei_main;
 422
 423   fail_if_enabled ();
 424
 425   if (!c.users)
 426     c.users = 1024;
 427
 428   if (!c.sessions)
 429     c.sessions = 10 * 1024;
 430
 431   if (!c.user_sessions)
 432     c.user_sessions = c.sessions;
 433
 434   nm->rconfig = c;
 435
 436   if (!nm->frame_queue_nelts)
 437     nm->frame_queue_nelts = NAT_FQ_NELTS_DEFAULT;
 438
 439   nm->translations = c.sessions;
 440   nm->translation_buckets = nat_calc_bihash_buckets (c.sessions);
 441   nm->user_buckets = nat_calc_bihash_buckets (c.users);
 442
 443   nm->pat = (!c.static_mapping_only ||
 444              (c.static_mapping_only && c.connection_tracking));
 445
 446   nm->static_mapping_only = c.static_mapping_only;
 447   nm->static_mapping_connection_tracking = c.connection_tracking;
 448   nm->out2in_dpo = c.out2in_dpo;
 449   nm->forwarding_enabled = 0;
 450   nm->mss_clamping = 0;
 451
 452   nm->max_users_per_thread = c.users;
 453   nm->max_translations_per_thread = c.sessions;
 454   nm->max_translations_per_user = c.user_sessions;
 455
 456   nm->inside_vrf_id = c.inside_vrf;
 457   nm->inside_fib_index = fib_table_find_or_create_and_lock (
 458     FIB_PROTOCOL_IP4, c.inside_vrf, nm->fib_src_hi);
 459
 460   nm->outside_vrf_id = c.outside_vrf;
 461   nm->outside_fib_index = fib_table_find_or_create_and_lock (
 462     FIB_PROTOCOL_IP4, c.outside_vrf, nm->fib_src_hi);
 463
 464   nat_reset_timeouts (&nm->timeouts);
 465   nat44_ei_db_init (nm->translations, nm->translation_buckets,
 466                     nm->user_buckets);
 467   nat44_ei_set_alloc_default ();
 468
 469   // TODO: zero simple counter for all counters missing
 470
 471   vlib_zero_simple_counter (&nm->total_users, 0);
 472   vlib_zero_simple_counter (&nm->total_sessions, 0);
 473   vlib_zero_simple_counter (&nm->user_limit_reached, 0);
 474
 475   nat_ha_enable ();
 476   nm->enabled = 1;
 477
 478   return 0;
 479 }
 480
 481 void
 482 nat44_ei_addresses_free (nat44_ei_address_t **addresses)
 483 {
 484   nat44_ei_address_t *ap;
 485   vec_foreach (ap, *addresses)
 486     {
 487 #define _(N, i, n, s) vec_free (ap->busy_##n##_ports_per_thread);
 488       foreach_nat_protocol
 489 #undef _
 490     }
 491   vec_free (*addresses);
 492   *addresses = 0;
 493 }
 494
 495 int
 496 nat44_ei_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del)
 497 {
 498   const char *feature_name, *del_feature_name;
 499   nat44_ei_main_t *nm = &nat44_ei_main;
 500   nat44_ei_interface_t *i;
 501   nat44_ei_address_t *ap;
 502   nat44_ei_static_mapping_t *m;
 503   nat44_ei_outside_fib_t *outside_fib;
 504   u32 fib_index =
 505     fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index);
 506
 507   fail_if_disabled ();
 508
 509   if (nm->out2in_dpo && !is_inside)
 510     {
 511       nat44_ei_log_err ("error unsupported");
 512       return VNET_API_ERROR_UNSUPPORTED;
 513     }
 514
 515   pool_foreach (i, nm->output_feature_interfaces)
 516     {
 517       if (i->sw_if_index == sw_if_index)
 518         {
 519           nat44_ei_log_err ("error interface already configured");
 520           return VNET_API_ERROR_VALUE_EXIST;
 521         }
 522     }
 523
 524   if (nm->static_mapping_only && !(nm->static_mapping_connection_tracking))
 525     feature_name = is_inside ? "nat44-ei-in2out-fast" : "nat44-ei-out2in-fast";
 526   else
 527     {
 528       if (nm->num_workers > 1)
 529         feature_name = is_inside ? "nat44-ei-in2out-worker-handoff" :
 530                                    "nat44-ei-out2in-worker-handoff";
 531       else
 532         feature_name = is_inside ? "nat44-ei-in2out" : "nat44-ei-out2in";
 533     }
 534
 535   if (nm->fq_in2out_index == ~0 && nm->num_workers > 1)
 536     nm->fq_in2out_index = vlib_frame_queue_main_init (nm->in2out_node_index,
 537                                                       nm->frame_queue_nelts);
 538
 539   if (nm->fq_out2in_index == ~0 && nm->num_workers > 1)
 540     nm->fq_out2in_index = vlib_frame_queue_main_init (nm->out2in_node_index,
 541                                                       nm->frame_queue_nelts);
 542
 543   if (!is_inside)
 544     {
 545       vec_foreach (outside_fib, nm->outside_fibs)
 546         {
 547           if (outside_fib->fib_index == fib_index)
 548             {
 549               if (is_del)
 550                 {
 551                   outside_fib->refcount--;
 552                   if (!outside_fib->refcount)
 553                     vec_del1 (nm->outside_fibs,
 554                               outside_fib - nm->outside_fibs);
 555                 }
 556               else
 557                 outside_fib->refcount++;
 558               goto feature_set;
 559             }
 560         }
 561       if (!is_del)
 562         {
 563           vec_add2 (nm->outside_fibs, outside_fib, 1);
 564           outside_fib->refcount = 1;
 565           outside_fib->fib_index = fib_index;
 566         }
 567     }
 568
 569 feature_set:
 570   pool_foreach (i, nm->interfaces)
 571     {
 572       if (i->sw_if_index == sw_if_index)
 573         {
 574           if (is_del)
 575             {
 576               if (nat44_ei_interface_is_inside (i) &&
 577                   nat44_ei_interface_is_outside (i))
 578                 {
 579                   if (is_inside)
 580                     i->flags &= ~NAT44_EI_INTERFACE_FLAG_IS_INSIDE;
 581                   else
 582                     i->flags &= ~NAT44_EI_INTERFACE_FLAG_IS_OUTSIDE;
 583
 584                   if (nm->num_workers > 1)
 585                     {
 586                       del_feature_name = "nat44-ei-handoff-classify";
 587                       clib_warning (
 588                         "del_feature_name = nat44-ei-handoff-classify");
 589                       feature_name = !is_inside ?
 590                                        "nat44-ei-in2out-worker-handoff" :
 591                                        "nat44-ei-out2in-worker-handoff";
 592                     }
 593                   else
 594                     {
 595                       del_feature_name = "nat44-ei-classify";
 596                       clib_warning ("del_feature_name = nat44-ei-classify");
 597                       feature_name =
 598                         !is_inside ? "nat44-ei-in2out" : "nat44-ei-out2in";
 599                     }
 600
 601                   int rv =
 602                     ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 0);
 603                   if (rv)
 604                     return rv;
 605                   rv = vnet_feature_enable_disable (
 606                     "ip4-unicast", del_feature_name, sw_if_index, 0, 0, 0);
 607                   if (rv)
 608                     return rv;
 609                   rv = vnet_feature_enable_disable (
 610                     "ip4-unicast", feature_name, sw_if_index, 1, 0, 0);
 611                   if (rv)
 612                     return rv;
 613                   if (!is_inside)
 614                     {
 615                       rv = vnet_feature_enable_disable ("ip4-local",
 616                                                         "nat44-ei-hairpinning",
 617                                                         sw_if_index, 1, 0, 0);
 618                       if (rv)
 619                         return rv;
 620                     }
 621                 }
 622               else
 623                 {
 624                   int rv =
 625                     ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 0);
 626                   if (rv)
 627                     return rv;
 628                   rv = vnet_feature_enable_disable (
 629                     "ip4-unicast", feature_name, sw_if_index, 0, 0, 0);
 630                   if (rv)
 631                     return rv;
 632                   pool_put (nm->interfaces, i);
 633                   if (is_inside)
 634                     {
 635                       rv = vnet_feature_enable_disable ("ip4-local",
 636                                                         "nat44-ei-hairpinning",
 637                                                         sw_if_index, 0, 0, 0);
 638                       if (rv)
 639                         return rv;
 640                     }
 641                 }
 642             }
 643           else
 644             {
 645               if ((nat44_ei_interface_is_inside (i) && is_inside) ||
 646                   (nat44_ei_interface_is_outside (i) && !is_inside))
 647                 return 0;
 648
 649               if (nm->num_workers > 1)
 650                 {
 651                   del_feature_name = !is_inside ?
 652                                        "nat44-ei-in2out-worker-handoff" :
 653                                        "nat44-ei-out2in-worker-handoff";
 654                   feature_name = "nat44-ei-handoff-classify";
 655                   clib_warning ("feature_name = nat44-ei-handoff-classify");
 656                 }
 657               else
 658                 {
 659                   del_feature_name =
 660                     !is_inside ? "nat44-ei-in2out" : "nat44-ei-out2in";
 661                   feature_name = "nat44-ei-classify";
 662                   clib_warning ("feature_name = nat44-ei-classify");
 663                 }
 664
 665               int rv =
 666                 ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 1);
 667               if (rv)
 668                 return rv;
 669               rv = vnet_feature_enable_disable (
 670                 "ip4-unicast", del_feature_name, sw_if_index, 0, 0, 0);
 671               if (rv)
 672                 return rv;
 673               rv = vnet_feature_enable_disable ("ip4-unicast", feature_name,
 674                                                 sw_if_index, 1, 0, 0);
 675               if (rv)
 676                 return rv;
 677               if (!is_inside)
 678                 {
 679                   rv = vnet_feature_enable_disable (
 680                     "ip4-local", "nat44-ei-hairpinning", sw_if_index, 0, 0, 0);
 681                   if (rv)
 682                     return rv;
 683                 }
 684               goto set_flags;
 685             }
 686
 687           goto fib;
 688         }
 689     }
 690
 691   if (is_del)
 692     {
 693       nat44_ei_log_err ("error interface couldn't be found");
 694       return VNET_API_ERROR_NO_SUCH_ENTRY;
 695     }
 696
 697   pool_get (nm->interfaces, i);
 698   i->sw_if_index = sw_if_index;
 699   i->flags = 0;
 700   nat_validate_interface_counters (nm, sw_if_index);
 701
 702   int rv = vnet_feature_enable_disable ("ip4-unicast", feature_name,
 703                                         sw_if_index, 1, 0, 0);
 704   if (rv)
 705     return rv;
 706
 707   rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 1);
 708   if (rv)
 709     return rv;
 710
 711   if (is_inside && !nm->out2in_dpo)
 712     {
 713       rv = vnet_feature_enable_disable ("ip4-local", "nat44-ei-hairpinning",
 714                                         sw_if_index, 1, 0, 0);
 715       if (rv)
 716         return rv;
 717     }
 718
 719 set_flags:
 720   if (is_inside)
 721     {
 722       i->flags |= NAT44_EI_INTERFACE_FLAG_IS_INSIDE;
 723       return 0;
 724     }
 725   else
 726     i->flags |= NAT44_EI_INTERFACE_FLAG_IS_OUTSIDE;
 727
 728   /* Add/delete external addresses to FIB */
 729 fib:
 730   vec_foreach (ap, nm->addresses)
 731     nat44_ei_add_del_addr_to_fib (&ap->addr, 32, sw_if_index, !is_del);
 732
 733   pool_foreach (m, nm->static_mappings)
 734     {
 735       if (!(nat44_ei_is_addr_only_static_mapping (m)) ||
 736           (m->local_addr.as_u32 == m->external_addr.as_u32))
 737         continue;
 738
 739       nat44_ei_add_del_addr_to_fib (&m->external_addr, 32, sw_if_index,
 740                                     !is_del);
 741     }
 742
 743   return 0;
 744 }
 745
 746 int
 747 nat44_ei_interface_add_del_output_feature (u32 sw_if_index, u8 is_inside,
 748                                            int is_del)
 749 {
 750   nat44_ei_main_t *nm = &nat44_ei_main;
 751   nat44_ei_interface_t *i;
 752   nat44_ei_address_t *ap;
 753   nat44_ei_static_mapping_t *m;
 754   nat44_ei_outside_fib_t *outside_fib;
 755   u32 fib_index =
 756     fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index);
 757
 758   fail_if_disabled ();
 759
 760   if (nm->static_mapping_only && !(nm->static_mapping_connection_tracking))
 761     {
 762       nat44_ei_log_err ("error unsupported");
 763       return VNET_API_ERROR_UNSUPPORTED;
 764     }
 765
 766   pool_foreach (i, nm->interfaces)
 767     {
 768       if (i->sw_if_index == sw_if_index)
 769         {
 770           nat44_ei_log_err ("error interface already configured");
 771           return VNET_API_ERROR_VALUE_EXIST;
 772         }
 773     }
 774
 775   if (!is_inside)
 776     {
 777       vec_foreach (outside_fib, nm->outside_fibs)
 778         {
 779           if (outside_fib->fib_index == fib_index)
 780             {
 781               if (is_del)
 782                 {
 783                   outside_fib->refcount--;
 784                   if (!outside_fib->refcount)
 785                     vec_del1 (nm->outside_fibs,
 786                               outside_fib - nm->outside_fibs);
 787                 }
 788               else
 789                 outside_fib->refcount++;
 790               goto feature_set;
 791             }
 792         }
 793       if (!is_del)
 794         {
 795           vec_add2 (nm->outside_fibs, outside_fib, 1);
 796           outside_fib->refcount = 1;
 797           outside_fib->fib_index = fib_index;
 798         }
 799     }
 800
 801 feature_set:
 802   if (is_inside)
 803     {
 804       int rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, !is_del);
 805       if (rv)
 806         return rv;
 807       rv =
 808         ip4_sv_reass_output_enable_disable_with_refcnt (sw_if_index, !is_del);
 809       if (rv)
 810         return rv;
 811       rv = vnet_feature_enable_disable ("ip4-unicast", "nat44-ei-hairpin-dst",
 812                                         sw_if_index, !is_del, 0, 0);
 813       if (rv)
 814         return rv;
 815       rv = vnet_feature_enable_disable ("ip4-output", "nat44-ei-hairpin-src",
 816                                         sw_if_index, !is_del, 0, 0);
 817       if (rv)
 818         return rv;
 819       goto fq;
 820     }
 821
 822   if (nm->num_workers > 1)
 823     {
 824       int rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, !is_del);
 825       if (rv)
 826         return rv;
 827       rv =
 828         ip4_sv_reass_output_enable_disable_with_refcnt (sw_if_index, !is_del);
 829       if (rv)
 830         return rv;
 831       rv = vnet_feature_enable_disable ("ip4-unicast",
 832                                         "nat44-ei-out2in-worker-handoff",
 833                                         sw_if_index, !is_del, 0, 0);
 834       if (rv)
 835         return rv;
 836       rv = vnet_feature_enable_disable (
 837         "ip4-output", "nat44-ei-in2out-output-worker-handoff", sw_if_index,
 838         !is_del, 0, 0);
 839       if (rv)
 840         return rv;
 841     }
 842   else
 843     {
 844       int rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, !is_del);
 845       if (rv)
 846         return rv;
 847       rv =
 848         ip4_sv_reass_output_enable_disable_with_refcnt (sw_if_index, !is_del);
 849       if (rv)
 850         return rv;
 851       rv = vnet_feature_enable_disable ("ip4-unicast", "nat44-ei-out2in",
 852                                         sw_if_index, !is_del, 0, 0);
 853       if (rv)
 854         return rv;
 855       rv = vnet_feature_enable_disable ("ip4-output", "nat44-ei-in2out-output",
 856                                         sw_if_index, !is_del, 0, 0);
 857       if (rv)
 858         return rv;
 859     }
 860
 861 fq:
 862   if (nm->fq_in2out_output_index == ~0 && nm->num_workers > 1)
 863     nm->fq_in2out_output_index =
 864       vlib_frame_queue_main_init (nm->in2out_output_node_index, 0);
 865
 866   if (nm->fq_out2in_index == ~0 && nm->num_workers > 1)
 867     nm->fq_out2in_index =
 868       vlib_frame_queue_main_init (nm->out2in_node_index, 0);
 869
 870   pool_foreach (i, nm->output_feature_interfaces)
 871     {
 872       if (i->sw_if_index == sw_if_index)
 873         {
 874           if (is_del)
 875             pool_put (nm->output_feature_interfaces, i);
 876           else
 877             return VNET_API_ERROR_VALUE_EXIST;
 878
 879           goto fib;
 880         }
 881     }
 882
 883   if (is_del)
 884     {
 885       nat44_ei_log_err ("error interface couldn't be found");
 886       return VNET_API_ERROR_NO_SUCH_ENTRY;
 887     }
 888
 889   pool_get (nm->output_feature_interfaces, i);
 890   i->sw_if_index = sw_if_index;
 891   i->flags = 0;
 892   nat_validate_interface_counters (nm, sw_if_index);
 893   if (is_inside)
 894     i->flags |= NAT44_EI_INTERFACE_FLAG_IS_INSIDE;
 895   else
 896     i->flags |= NAT44_EI_INTERFACE_FLAG_IS_OUTSIDE;
 897
 898   /* Add/delete external addresses to FIB */
 899 fib:
 900   if (is_inside)
 901     return 0;
 902
 903   vec_foreach (ap, nm->addresses)
 904     nat44_ei_add_del_addr_to_fib (&ap->addr, 32, sw_if_index, !is_del);
 905
 906   pool_foreach (m, nm->static_mappings)
 907     {
 908       if (!((nat44_ei_is_addr_only_static_mapping (m))) ||
 909           (m->local_addr.as_u32 == m->external_addr.as_u32))
 910         continue;
 911
 912       nat44_ei_add_del_addr_to_fib (&m->external_addr, 32, sw_if_index,
 913                                     !is_del);
 914     }
 915
 916   return 0;
 917 }
 918
 919 int
 920 nat44_ei_plugin_disable ()
 921 {
 922   nat44_ei_main_t *nm = &nat44_ei_main;
 923   nat44_ei_interface_t *i, *vec;
 924   int error = 0;
 925
 926   // first unregister all nodes from interfaces
 927   vec = vec_dup (nm->interfaces);
 928   vec_foreach (i, vec)
 929     {
 930       if (nat44_ei_interface_is_inside (i))
 931         error = nat44_ei_interface_add_del (i->sw_if_index, 1, 1);
 932       if (nat44_ei_interface_is_outside (i))
 933         error = nat44_ei_interface_add_del (i->sw_if_index, 0, 1);
 934
 935       if (error)
 936         {
 937           nat44_ei_log_err ("error occurred while removing interface %u",
 938                             i->sw_if_index);
 939         }
 940     }
 941   vec_free (vec);
 942   nm->interfaces = 0;
 943
 944   vec = vec_dup (nm->output_feature_interfaces);
 945   vec_foreach (i, vec)
 946     {
 947       if (nat44_ei_interface_is_inside (i))
 948         error =
 949           nat44_ei_interface_add_del_output_feature (i->sw_if_index, 1, 1);
 950       if (nat44_ei_interface_is_outside (i))
 951         error =
 952           nat44_ei_interface_add_del_output_feature (i->sw_if_index, 0, 1);
 953
 954       if (error)
 955         {
 956           nat44_ei_log_err ("error occurred while removing interface %u",
 957                             i->sw_if_index);
 958         }
 959     }
 960   vec_free (vec);
 961   nm->output_feature_interfaces = 0;
 962
 963   nat_ha_disable ();
 964   nat44_ei_db_free ();
 965
 966   nat44_ei_addresses_free (&nm->addresses);
 967
 968   vec_free (nm->to_resolve);
 969   vec_free (nm->auto_add_sw_if_indices);
 970
 971   nm->to_resolve = 0;
 972   nm->auto_add_sw_if_indices = 0;
 973
 974   nm->forwarding_enabled = 0;
 975
 976   nm->enabled = 0;
 977   clib_memset (&nm->rconfig, 0, sizeof (nm->rconfig));
 978
 979   return error;
 980 }
 981
 982 int
 983 nat44_ei_set_outside_address_and_port (nat44_ei_address_t *addresses,
 984                                        u32 thread_index, ip4_address_t addr,
 985                                        u16 port, nat_protocol_t protocol)
 986 {
 987   nat44_ei_main_t *nm = &nat44_ei_main;
 988   nat44_ei_address_t *a = 0;
 989   u32 address_index;
 990   u16 port_host_byte_order = clib_net_to_host_u16 (port);
 991
 992   for (address_index = 0; address_index < vec_len (addresses); address_index++)
 993     {
 994       if (addresses[address_index].addr.as_u32 != addr.as_u32)
 995         continue;
 996
 997       a = addresses + address_index;
 998       switch (protocol)
 999         {
1000 #define _(N, j, n, s)                                                         \
1001   case NAT_PROTOCOL_##N:                                                      \
1002     if (a->busy_##n##_port_refcounts[port_host_byte_order])                   \
1003       return VNET_API_ERROR_INSTANCE_IN_USE;                                  \
1004     ++a->busy_##n##_port_refcounts[port_host_byte_order];                     \
1005     a->busy_##n##_ports_per_thread[thread_index]++;                           \
1006     a->busy_##n##_ports++;                                                    \
1007     return 0;
1008           foreach_nat_protocol
1009 #undef _
1010             default : nat_elog_info (nm, "unknown protocol");
1011           return 1;
1012         }
1013     }
1014
1015   return VNET_API_ERROR_NO_SUCH_ENTRY;
1016 }
1017
1018 void
1019 nat44_ei_add_del_address_dpo (ip4_address_t addr, u8 is_add)
1020 {
1021   nat44_ei_main_t *nm = &nat44_ei_main;
1022   dpo_id_t dpo_v4 = DPO_INVALID;
1023   fib_prefix_t pfx = {
1024     .fp_proto = FIB_PROTOCOL_IP4,
1025     .fp_len = 32,
1026     .fp_addr.ip4.as_u32 = addr.as_u32,
1027   };
1028
1029   if (is_add)
1030     {
1031       nat_dpo_create (DPO_PROTO_IP4, 0, &dpo_v4);
1032       fib_table_entry_special_dpo_add (0, &pfx, nm->fib_src_hi,
1033                                        FIB_ENTRY_FLAG_EXCLUSIVE, &dpo_v4);
1034       dpo_reset (&dpo_v4);
1035     }
1036   else
1037     {
1038       fib_table_entry_special_remove (0, &pfx, nm->fib_src_hi);
1039     }
1040 }
1041
1042 void
1043 nat44_ei_free_outside_address_and_port (nat44_ei_address_t *addresses,
1044                                         u32 thread_index, ip4_address_t *addr,
1045                                         u16 port, nat_protocol_t protocol)
1046 {
1047   nat44_ei_main_t *nm = &nat44_ei_main;
1048   nat44_ei_address_t *a;
1049   u32 address_index;
1050   u16 port_host_byte_order = clib_net_to_host_u16 (port);
1051
1052   for (address_index = 0; address_index < vec_len (addresses); address_index++)
1053     {
1054       if (addresses[address_index].addr.as_u32 == addr->as_u32)
1055         break;
1056     }
1057
1058   ASSERT (address_index < vec_len (addresses));
1059
1060   a = addresses + address_index;
1061
1062   switch (protocol)
1063     {
1064 #define _(N, i, n, s)                                                         \
1065   case NAT_PROTOCOL_##N:                                                      \
1066     ASSERT (a->busy_##n##_port_refcounts[port_host_byte_order] >= 1);         \
1067     --a->busy_##n##_port_refcounts[port_host_byte_order];                     \
1068     a->busy_##n##_ports--;                                                    \
1069     a->busy_##n##_ports_per_thread[thread_index]--;                           \
1070     break;
1071       foreach_nat_protocol
1072 #undef _
1073         default : nat_elog_info (nm, "unknown protocol");
1074       return;
1075     }
1076 }
1077
1078 void
1079 nat44_ei_free_session_data_v2 (nat44_ei_main_t *nm, nat44_ei_session_t *s,
1080                                u32 thread_index, u8 is_ha)
1081 {
1082   clib_bihash_kv_8_8_t kv;
1083
1084   /* session lookup tables */
1085   init_nat_i2o_k (&kv, s);
1086   if (clib_bihash_add_del_8_8 (&nm->in2out, &kv, 0))
1087     nat_elog_warn (nm, "in2out key del failed");
1088   init_nat_o2i_k (&kv, s);
1089   if (clib_bihash_add_del_8_8 (&nm->out2in, &kv, 0))
1090     nat_elog_warn (nm, "out2in key del failed");
1091
1092   if (!is_ha)
1093     nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
1094                              &s->in2out.addr, s->in2out.port, &s->out2in.addr,
1095                              s->out2in.port, s->nat_proto);
1096
1097   if (nat44_ei_is_unk_proto_session (s))
1098     return;
1099
1100   if (!is_ha)
1101     {
1102       /* log NAT event */
1103       nat_ipfix_logging_nat44_ses_delete (
1104         thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32,
1105         s->nat_proto, s->in2out.port, s->out2in.port, s->in2out.fib_index);
1106
1107       nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
1108                    s->ext_host_port, s->nat_proto, s->out2in.fib_index,
1109                    thread_index);
1110     }
1111
1112   if (nat44_ei_is_session_static (s))
1113     return;
1114
1115   nat44_ei_free_outside_address_and_port (nm->addresses, thread_index,
1116                                           &s->out2in.addr, s->out2in.port,
1117                                           s->nat_proto);
1118 }
1119
1120 nat44_ei_user_t *
1121 nat44_ei_user_get_or_create (nat44_ei_main_t *nm, ip4_address_t *addr,
1122                              u32 fib_index, u32 thread_index)
1123 {
1124   nat44_ei_user_t *u = 0;
1125   nat44_ei_user_key_t user_key;
1126   clib_bihash_kv_8_8_t kv, value;
1127   nat44_ei_main_per_thread_data_t *tnm = &nm->per_thread_data[thread_index];
1128   dlist_elt_t *per_user_list_head_elt;
1129
1130   user_key.addr.as_u32 = addr->as_u32;
1131   user_key.fib_index = fib_index;
1132   kv.key = user_key.as_u64;
1133
1134   /* Ever heard of the "user" = src ip4 address before? */
1135   if (clib_bihash_search_8_8 (&tnm->user_hash, &kv, &value))
1136     {
1137       if (pool_elts (tnm->users) >= nm->max_users_per_thread)
1138         {
1139           vlib_increment_simple_counter (&nm->user_limit_reached, thread_index,
1140                                          0, 1);
1141           nat_elog_warn (nm, "maximum user limit reached");
1142           return NULL;
1143         }
1144       /* no, make a new one */
1145       pool_get (tnm->users, u);
1146       clib_memset (u, 0, sizeof (*u));
1147
1148       u->addr.as_u32 = addr->as_u32;
1149       u->fib_index = fib_index;
1150
1151       pool_get (tnm->list_pool, per_user_list_head_elt);
1152
1153       u->sessions_per_user_list_head_index =
1154         per_user_list_head_elt - tnm->list_pool;
1155
1156       clib_dlist_init (tnm->list_pool, u->sessions_per_user_list_head_index);
1157
1158       kv.value = u - tnm->users;
1159
1160       /* add user */
1161       if (clib_bihash_add_del_8_8 (&tnm->user_hash, &kv, 1))
1162         {
1163           nat_elog_warn (nm, "user_hash key add failed");
1164           nat44_ei_delete_user_with_no_session (nm, u, thread_index);
1165           return NULL;
1166         }
1167
1168       vlib_set_simple_counter (&nm->total_users, thread_index, 0,
1169                                pool_elts (tnm->users));
1170     }
1171   else
1172     {
1173       u = pool_elt_at_index (tnm->users, value.value);
1174     }
1175
1176   return u;
1177 }
1178
1179 nat44_ei_session_t *
1180 nat44_ei_session_alloc_or_recycle (nat44_ei_main_t *nm, nat44_ei_user_t *u,
1181                                    u32 thread_index, f64 now)
1182 {
1183   nat44_ei_session_t *s;
1184   nat44_ei_main_per_thread_data_t *tnm = &nm->per_thread_data[thread_index];
1185   u32 oldest_per_user_translation_list_index, session_index;
1186   dlist_elt_t *oldest_per_user_translation_list_elt;
1187   dlist_elt_t *per_user_translation_list_elt;
1188
1189   /* Over quota? Recycle the least recently used translation */
1190   if ((u->nsessions + u->nstaticsessions) >= nm->max_translations_per_user)
1191     {
1192       oldest_per_user_translation_list_index = clib_dlist_remove_head (
1193         tnm->list_pool, u->sessions_per_user_list_head_index);
1194
1195       ASSERT (oldest_per_user_translation_list_index != ~0);
1196
1197       /* Add it back to the end of the LRU list */
1198       clib_dlist_addtail (tnm->list_pool, u->sessions_per_user_list_head_index,
1199                           oldest_per_user_translation_list_index);
1200       /* Get the list element */
1201       oldest_per_user_translation_list_elt = pool_elt_at_index (
1202         tnm->list_pool, oldest_per_user_translation_list_index);
1203
1204       /* Get the session index from the list element */
1205       session_index = oldest_per_user_translation_list_elt->value;
1206
1207       /* Get the session */
1208       s = pool_elt_at_index (tnm->sessions, session_index);
1209
1210       nat44_ei_free_session_data_v2 (nm, s, thread_index, 0);
1211       if (nat44_ei_is_session_static (s))
1212         u->nstaticsessions--;
1213       else
1214         u->nsessions--;
1215       s->flags = 0;
1216       s->total_bytes = 0;
1217       s->total_pkts = 0;
1218       s->state = 0;
1219       s->ext_host_addr.as_u32 = 0;
1220       s->ext_host_port = 0;
1221       s->ext_host_nat_addr.as_u32 = 0;
1222       s->ext_host_nat_port = 0;
1223     }
1224   else
1225     {
1226       pool_get (tnm->sessions, s);
1227       clib_memset (s, 0, sizeof (*s));
1228
1229       /* Create list elts */
1230       pool_get (tnm->list_pool, per_user_translation_list_elt);
1231       clib_dlist_init (tnm->list_pool,
1232                        per_user_translation_list_elt - tnm->list_pool);
1233
1234       per_user_translation_list_elt->value = s - tnm->sessions;
1235       s->per_user_index = per_user_translation_list_elt - tnm->list_pool;
1236       s->per_user_list_head_index = u->sessions_per_user_list_head_index;
1237
1238       clib_dlist_addtail (tnm->list_pool, s->per_user_list_head_index,
1239                           per_user_translation_list_elt - tnm->list_pool);
1240
1241       s->user_index = u - tnm->users;
1242       vlib_set_simple_counter (&nm->total_sessions, thread_index, 0,
1243                                pool_elts (tnm->sessions));
1244     }
1245
1246   s->ha_last_refreshed = now;
1247
1248   return s;
1249 }
1250
1251 void
1252 nat44_ei_free_session_data (nat44_ei_main_t *nm, nat44_ei_session_t *s,
1253                             u32 thread_index, u8 is_ha)
1254 {
1255   clib_bihash_kv_8_8_t kv;
1256
1257   init_nat_i2o_k (&kv, s);
1258   if (clib_bihash_add_del_8_8 (&nm->in2out, &kv, 0))
1259     nat_elog_warn (nm, "in2out key del failed");
1260
1261   init_nat_o2i_k (&kv, s);
1262   if (clib_bihash_add_del_8_8 (&nm->out2in, &kv, 0))
1263     nat_elog_warn (nm, "out2in key del failed");
1264
1265   if (!is_ha)
1266     {
1267       nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
1268                                &s->in2out.addr, s->in2out.port,
1269                                &s->out2in.addr, s->out2in.port, s->nat_proto);
1270
1271       nat_ipfix_logging_nat44_ses_delete (
1272         thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32,
1273         s->nat_proto, s->in2out.port, s->out2in.port, s->in2out.fib_index);
1274
1275       nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
1276                    s->ext_host_port, s->nat_proto, s->out2in.fib_index,
1277                    thread_index);
1278     }
1279
1280   if (nat44_ei_is_session_static (s))
1281     return;
1282
1283   nat44_ei_free_outside_address_and_port (nm->addresses, thread_index,
1284                                           &s->out2in.addr, s->out2in.port,
1285                                           s->nat_proto);
1286 }
1287
1288 static_always_inline void
1289 nat44_ei_user_del_sessions (nat44_ei_user_t *u, u32 thread_index)
1290 {
1291   dlist_elt_t *elt;
1292   nat44_ei_session_t *s;
1293
1294   nat44_ei_main_t *nm = &nat44_ei_main;
1295   nat44_ei_main_per_thread_data_t *tnm = &nm->per_thread_data[thread_index];
1296
1297   // get head
1298   elt =
1299     pool_elt_at_index (tnm->list_pool, u->sessions_per_user_list_head_index);
1300   // get first element
1301   elt = pool_elt_at_index (tnm->list_pool, elt->next);
1302
1303   while (elt->value != ~0)
1304     {
1305       s = pool_elt_at_index (tnm->sessions, elt->value);
1306       elt = pool_elt_at_index (tnm->list_pool, elt->next);
1307
1308       nat44_ei_free_session_data (nm, s, thread_index, 0);
1309       nat44_ei_delete_session (nm, s, thread_index);
1310     }
1311 }
1312
1313 int
1314 nat44_ei_user_del (ip4_address_t *addr, u32 fib_index)
1315 {
1316   int rv = 1;
1317
1318   nat44_ei_main_t *nm = &nat44_ei_main;
1319   nat44_ei_main_per_thread_data_t *tnm;
1320
1321   nat44_ei_user_key_t user_key;
1322   clib_bihash_kv_8_8_t kv, value;
1323
1324   user_key.addr.as_u32 = addr->as_u32;
1325   user_key.fib_index = fib_index;
1326   kv.key = user_key.as_u64;
1327
1328   if (nm->num_workers > 1)
1329     {
1330       vec_foreach (tnm, nm->per_thread_data)
1331         {
1332           if (!clib_bihash_search_8_8 (&tnm->user_hash, &kv, &value))
1333             {
1334               nat44_ei_user_del_sessions (
1335                 pool_elt_at_index (tnm->users, value.value),
1336                 tnm->thread_index);
1337               rv = 0;
1338               break;
1339             }
1340         }
1341     }
1342   else
1343     {
1344       tnm = vec_elt_at_index (nm->per_thread_data, nm->num_workers);
1345       if (!clib_bihash_search_8_8 (&tnm->user_hash, &kv, &value))
1346         {
1347           nat44_ei_user_del_sessions (
1348             pool_elt_at_index (tnm->users, value.value), tnm->thread_index);
1349           rv = 0;
1350         }
1351     }
1352   return rv;
1353 }
1354
1355 void
1356 nat44_ei_static_mapping_del_sessions (nat44_ei_main_t *nm,
1357                                       nat44_ei_main_per_thread_data_t *tnm,
1358                                       nat44_ei_user_key_t u_key, int addr_only,
1359                                       ip4_address_t e_addr, u16 e_port)
1360 {
1361   clib_bihash_kv_8_8_t kv, value;
1362   kv.key = u_key.as_u64;
1363   u64 user_index;
1364   dlist_elt_t *head, *elt;
1365   nat44_ei_user_t *u;
1366   nat44_ei_session_t *s;
1367   u32 elt_index, head_index, ses_index;
1368
1369   if (!clib_bihash_search_8_8 (&tnm->user_hash, &kv, &value))
1370     {
1371       user_index = value.value;
1372       u = pool_elt_at_index (tnm->users, user_index);
1373       if (u->nstaticsessions)
1374         {
1375           head_index = u->sessions_per_user_list_head_index;
1376           head = pool_elt_at_index (tnm->list_pool, head_index);
1377           elt_index = head->next;
1378           elt = pool_elt_at_index (tnm->list_pool, elt_index);
1379           ses_index = elt->value;
1380           while (ses_index != ~0)
1381             {
1382               s = pool_elt_at_index (tnm->sessions, ses_index);
1383               elt = pool_elt_at_index (tnm->list_pool, elt->next);
1384               ses_index = elt->value;
1385
1386               if (!addr_only)
1387                 {
1388                   if ((s->out2in.addr.as_u32 != e_addr.as_u32) ||
1389                       (s->out2in.port != e_port))
1390                     continue;
1391                 }
1392
1393               if (!nat44_ei_is_session_static (s))
1394                 continue;
1395
1396               nat44_ei_free_session_data_v2 (nm, s, tnm - nm->per_thread_data,
1397                                              0);
1398               nat44_ei_delete_session (nm, s, tnm - nm->per_thread_data);
1399
1400               if (!addr_only)
1401                 break;
1402             }
1403         }
1404     }
1405 }
1406
1407 u32
1408 nat44_ei_get_in2out_worker_index (ip4_header_t *ip0, u32 rx_fib_index0,
1409                                   u8 is_output)
1410 {
1411   nat44_ei_main_t *nm = &nat44_ei_main;
1412   u32 next_worker_index = 0;
1413   u32 hash;
1414
1415   next_worker_index = nm->first_worker_index;
1416   hash = ip0->src_address.as_u32 + (ip0->src_address.as_u32 >> 8) +
1417          (ip0->src_address.as_u32 >> 16) + (ip0->src_address.as_u32 >> 24);
1418
1419   if (PREDICT_TRUE (is_pow2 (_vec_len (nm->workers))))
1420     next_worker_index += nm->workers[hash & (_vec_len (nm->workers) - 1)];
1421   else
1422     next_worker_index += nm->workers[hash % _vec_len (nm->workers)];
1423
1424   return next_worker_index;
1425 }
1426
1427 u32
1428 nat44_ei_get_out2in_worker_index (vlib_buffer_t *b, ip4_header_t *ip0,
1429                                   u32 rx_fib_index0, u8 is_output)
1430 {
1431   nat44_ei_main_t *nm = &nat44_ei_main;
1432   udp_header_t *udp;
1433   u16 port;
1434   clib_bihash_kv_8_8_t kv, value;
1435   nat44_ei_static_mapping_t *m;
1436   u32 proto;
1437   u32 next_worker_index = 0;
1438
1439   /* first try static mappings without port */
1440   if (PREDICT_FALSE (pool_elts (nm->static_mappings)))
1441     {
1442       init_nat_k (&kv, ip0->dst_address, 0, rx_fib_index0, 0);
1443       if (!clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv,
1444                                    &value))
1445         {
1446           m = pool_elt_at_index (nm->static_mappings, value.value);
1447           return m->workers[0];
1448         }
1449     }
1450
1451   proto = ip_proto_to_nat_proto (ip0->protocol);
1452   udp = ip4_next_header (ip0);
1453   port = vnet_buffer (b)->ip.reass.l4_dst_port;
1454
1455   /* unknown protocol */
1456   if (PREDICT_FALSE (proto == NAT_PROTOCOL_OTHER))
1457     {
1458       /* use current thread */
1459       return vlib_get_thread_index ();
1460     }
1461
1462   if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_ICMP))
1463     {
1464       icmp46_header_t *icmp = (icmp46_header_t *) udp;
1465       icmp_echo_header_t *echo = (icmp_echo_header_t *) (icmp + 1);
1466       if (!icmp_type_is_error_message (
1467             vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
1468         port = vnet_buffer (b)->ip.reass.l4_src_port;
1469       else
1470         {
1471           /* if error message, then it's not fragmented and we can access it */
1472           ip4_header_t *inner_ip = (ip4_header_t *) (echo + 1);
1473           proto = ip_proto_to_nat_proto (inner_ip->protocol);
1474           void *l4_header = ip4_next_header (inner_ip);
1475           switch (proto)
1476             {
1477             case NAT_PROTOCOL_ICMP:
1478               icmp = (icmp46_header_t *) l4_header;
1479               echo = (icmp_echo_header_t *) (icmp + 1);
1480               port = echo->identifier;
1481               break;
1482             case NAT_PROTOCOL_UDP:
1483             case NAT_PROTOCOL_TCP:
1484               port = ((tcp_udp_header_t *) l4_header)->src_port;
1485               break;
1486             default:
1487               return vlib_get_thread_index ();
1488             }
1489         }
1490     }
1491
1492   /* try static mappings with port */
1493   if (PREDICT_FALSE (pool_elts (nm->static_mappings)))
1494     {
1495       init_nat_k (&kv, ip0->dst_address, port, rx_fib_index0, proto);
1496       if (!clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv,
1497                                    &value))
1498         {
1499           m = pool_elt_at_index (nm->static_mappings, value.value);
1500           return m->workers[0];
1501         }
1502     }
1503
1504   /* worker by outside port */
1505   next_worker_index = nm->first_worker_index;
1506   next_worker_index +=
1507     nm->workers[(clib_net_to_host_u16 (port) - 1024) / nm->port_per_thread];
1508   return next_worker_index;
1509 }
1510
1511 static int
1512 nat44_ei_alloc_default_cb (nat44_ei_address_t *addresses, u32 fib_index,
1513                            u32 thread_index, nat_protocol_t proto,
1514                            ip4_address_t s_addr, ip4_address_t *addr,
1515                            u16 *port, u16 port_per_thread,
1516                            u32 snat_thread_index)
1517 {
1518   nat44_ei_main_t *nm = &nat44_ei_main;
1519   nat44_ei_address_t *a, *ga = 0;
1520   u32 portnum;
1521   int i;
1522
1523   if (vec_len (addresses) > 0)
1524     {
1525
1526       int s_addr_offset = s_addr.as_u32 % vec_len (addresses);
1527
1528       for (i = s_addr_offset; i < vec_len (addresses); ++i)
1529         {
1530           a = addresses + i;
1531           switch (proto)
1532             {
1533 #define _(N, j, n, s)                                                         \
1534   case NAT_PROTOCOL_##N:                                                      \
1535     if (a->busy_##n##_ports_per_thread[thread_index] < port_per_thread)       \
1536       {                                                                       \
1537         if (a->fib_index == fib_index)                                        \
1538           {                                                                   \
1539             while (1)                                                         \
1540               {                                                               \
1541                 portnum = (port_per_thread * snat_thread_index) +             \
1542                           nat_random_port (&nm->random_seed, 0,               \
1543                                            port_per_thread - 1) +             \
1544                           1024;                                               \
1545                 if (a->busy_##n##_port_refcounts[portnum])                    \
1546                   continue;                                                   \
1547                 --a->busy_##n##_port_refcounts[portnum];                      \
1548                 a->busy_##n##_ports_per_thread[thread_index]++;               \
1549                 a->busy_##n##_ports++;                                        \
1550                 *addr = a->addr;                                              \
1551                 *port = clib_host_to_net_u16 (portnum);                       \
1552                 return 0;                                                     \
1553               }                                                               \
1554           }                                                                   \
1555         else if (a->fib_index == ~0)                                          \
1556           {                                                                   \
1557             ga = a;                                                           \
1558           }                                                                   \
1559       }                                                                       \
1560     break;
1561               foreach_nat_protocol;
1562             default:
1563               nat_elog_info (nm, "unknown protocol");
1564               return 1;
1565             }
1566         }
1567
1568       for (i = 0; i < s_addr_offset; ++i)
1569         {
1570           a = addresses + i;
1571           switch (proto)
1572             {
1573               foreach_nat_protocol;
1574             default:
1575               nat_elog_info (nm, "unknown protocol");
1576               return 1;
1577             }
1578         }
1579   if (ga)
1580     {
1581       a = ga;
1582       // fake fib index to reuse macro
1583       fib_index = ~0;
1584       switch (proto)
1585         {
1586           foreach_nat_protocol;
1587             default : nat_elog_info (nm, "unknown protocol");
1588           return 1;
1589         }
1590     }
1591     }
1592
1593 #undef _
1594
1595   /* Totally out of translations to use... */
1596   nat_ipfix_logging_addresses_exhausted (thread_index, 0);
1597   return 1;
1598 }
1599
1600 static int
1601 nat44_ei_alloc_range_cb (nat44_ei_address_t *addresses, u32 fib_index,
1602                          u32 thread_index, nat_protocol_t proto,
1603                          ip4_address_t s_addr, ip4_address_t *addr, u16 *port,
1604                          u16 port_per_thread, u32 snat_thread_index)
1605 {
1606   nat44_ei_main_t *nm = &nat44_ei_main;
1607   nat44_ei_address_t *a = addresses;
1608   u16 portnum, ports;
1609
1610   ports = nm->end_port - nm->start_port + 1;
1611
1612   if (!vec_len (addresses))
1613     goto exhausted;
1614
1615   switch (proto)
1616     {
1617 #define _(N, i, n, s)                                                         \
1618   case NAT_PROTOCOL_##N:                                                      \
1619     if (a->busy_##n##_ports < ports)                                          \
1620       {                                                                       \
1621         while (1)                                                             \
1622           {                                                                   \
1623             portnum = nat_random_port (&nm->random_seed, nm->start_port,      \
1624                                        nm->end_port);                         \
1625             if (a->busy_##n##_port_refcounts[portnum])                        \
1626               continue;                                                       \
1627             ++a->busy_##n##_port_refcounts[portnum];                          \
1628             a->busy_##n##_ports++;                                            \
1629             *addr = a->addr;                                                  \
1630             *port = clib_host_to_net_u16 (portnum);                           \
1631             return 0;                                                         \
1632           }                                                                   \
1633       }                                                                       \
1634     break;
1635       foreach_nat_protocol
1636 #undef _
1637         default : nat_elog_info (nm, "unknown protocol");
1638       return 1;
1639     }
1640
1641 exhausted:
1642   /* Totally out of translations to use... */
1643   nat_ipfix_logging_addresses_exhausted (thread_index, 0);
1644   return 1;
1645 }
1646
1647 static int
1648 nat44_ei_alloc_mape_cb (nat44_ei_address_t *addresses, u32 fib_index,
1649                         u32 thread_index, nat_protocol_t proto,
1650                         ip4_address_t s_addr, ip4_address_t *addr, u16 *port,
1651                         u16 port_per_thread, u32 snat_thread_index)
1652 {
1653   nat44_ei_main_t *nm = &nat44_ei_main;
1654   nat44_ei_address_t *a = addresses;
1655   u16 m, ports, portnum, A, j;
1656   m = 16 - (nm->psid_offset + nm->psid_length);
1657   ports = (1 << (16 - nm->psid_length)) - (1 << m);
1658
1659   if (!vec_len (addresses))
1660     goto exhausted;
1661
1662   switch (proto)
1663     {
1664 #define _(N, i, n, s)                                                         \
1665   case NAT_PROTOCOL_##N:                                                      \
1666     if (a->busy_##n##_ports < ports)                                          \
1667       {                                                                       \
1668         while (1)                                                             \
1669           {                                                                   \
1670             A = nat_random_port (&nm->random_seed, 1,                         \
1671                                  pow2_mask (nm->psid_offset));                \
1672             j = nat_random_port (&nm->random_seed, 0, pow2_mask (m));         \
1673             portnum = A | (nm->psid << nm->psid_offset) | (j << (16 - m));    \
1674             if (a->busy_##n##_port_refcounts[portnum])                        \
1675               continue;                                                       \
1676             ++a->busy_##n##_port_refcounts[portnum];                          \
1677             a->busy_##n##_ports++;                                            \
1678             *addr = a->addr;                                                  \
1679             *port = clib_host_to_net_u16 (portnum);                           \
1680             return 0;                                                         \
1681           }                                                                   \
1682       }                                                                       \
1683     break;
1684       foreach_nat_protocol
1685 #undef _
1686         default : nat_elog_info (nm, "unknown protocol");
1687       return 1;
1688     }
1689
1690 exhausted:
1691   /* Totally out of translations to use... */
1692   nat_ipfix_logging_addresses_exhausted (thread_index, 0);
1693   return 1;
1694 }
1695
1696 void
1697 nat44_ei_set_alloc_default ()
1698 {
1699   nat44_ei_main_t *nm = &nat44_ei_main;
1700
1701   nm->addr_and_port_alloc_alg = NAT44_EI_ADDR_AND_PORT_ALLOC_ALG_DEFAULT;
1702   nm->alloc_addr_and_port = nat44_ei_alloc_default_cb;
1703 }
1704
1705 void
1706 nat44_ei_set_alloc_range (u16 start_port, u16 end_port)
1707 {
1708   nat44_ei_main_t *nm = &nat44_ei_main;
1709
1710   nm->addr_and_port_alloc_alg = NAT44_EI_ADDR_AND_PORT_ALLOC_ALG_RANGE;
1711   nm->alloc_addr_and_port = nat44_ei_alloc_range_cb;
1712   nm->start_port = start_port;
1713   nm->end_port = end_port;
1714 }
1715
1716 void
1717 nat44_ei_set_alloc_mape (u16 psid, u16 psid_offset, u16 psid_length)
1718 {
1719   nat44_ei_main_t *nm = &nat44_ei_main;
1720
1721   nm->addr_and_port_alloc_alg = NAT44_EI_ADDR_AND_PORT_ALLOC_ALG_MAPE;
1722   nm->alloc_addr_and_port = nat44_ei_alloc_mape_cb;
1723   nm->psid = psid;
1724   nm->psid_offset = psid_offset;
1725   nm->psid_length = psid_length;
1726 }
1727
1728 static void
1729 nat44_ei_add_static_mapping_when_resolved (ip4_address_t l_addr, u16 l_port,
1730                                            u16 e_port, nat_protocol_t proto,
1731                                            u32 sw_if_index, u32 vrf_id,
1732                                            int addr_only, int identity_nat,
1733                                            u8 *tag)
1734 {
1735   nat44_ei_main_t *nm = &nat44_ei_main;
1736   nat44_ei_static_map_resolve_t *rp;
1737
1738   vec_add2 (nm->to_resolve, rp, 1);
1739   clib_memset (rp, 0, sizeof (*rp));
1740
1741   rp->l_addr.as_u32 = l_addr.as_u32;
1742   rp->l_port = l_port;
1743   rp->e_port = e_port;
1744   rp->sw_if_index = sw_if_index;
1745   rp->vrf_id = vrf_id;
1746   rp->proto = proto;
1747   rp->addr_only = addr_only;
1748   rp->identity_nat = identity_nat;
1749   rp->tag = vec_dup (tag);
1750 }
1751
1752 void
1753 nat44_ei_delete_session (nat44_ei_main_t *nm, nat44_ei_session_t *ses,
1754                          u32 thread_index)
1755 {
1756   nat44_ei_main_per_thread_data_t *tnm =
1757     vec_elt_at_index (nm->per_thread_data, thread_index);
1758   clib_bihash_kv_8_8_t kv, value;
1759   nat44_ei_user_t *u;
1760   const nat44_ei_user_key_t u_key = { .addr = ses->in2out.addr,
1761                                       .fib_index = ses->in2out.fib_index };
1762   const u8 u_static = nat44_ei_is_session_static (ses);
1763
1764   clib_dlist_remove (tnm->list_pool, ses->per_user_index);
1765   pool_put_index (tnm->list_pool, ses->per_user_index);
1766
1767   pool_put (tnm->sessions, ses);
1768   vlib_set_simple_counter (&nm->total_sessions, thread_index, 0,
1769                            pool_elts (tnm->sessions));
1770
1771   kv.key = u_key.as_u64;
1772   if (!clib_bihash_search_8_8 (&tnm->user_hash, &kv, &value))
1773     {
1774       u = pool_elt_at_index (tnm->users, value.value);
1775       if (u_static)
1776         u->nstaticsessions--;
1777       else
1778         u->nsessions--;
1779
1780       nat44_ei_delete_user_with_no_session (nm, u, thread_index);
1781     }
1782 }
1783
1784 int
1785 nat44_ei_del_session (nat44_ei_main_t *nm, ip4_address_t *addr, u16 port,
1786                       nat_protocol_t proto, u32 vrf_id, int is_in)
1787 {
1788   nat44_ei_main_per_thread_data_t *tnm;
1789   clib_bihash_kv_8_8_t kv, value;
1790   u32 fib_index = fib_table_find (FIB_PROTOCOL_IP4, vrf_id);
1791   nat44_ei_session_t *s;
1792   clib_bihash_8_8_t *t;
1793
1794   init_nat_k (&kv, *addr, port, fib_index, proto);
1795   t = is_in ? &nm->in2out : &nm->out2in;
1796   if (!clib_bihash_search_8_8 (t, &kv, &value))
1797     {
1798       // this is called from API/CLI, so the world is stopped here
1799       // it's safe to manipulate arbitrary per-thread data
1800       u32 thread_index = nat_value_get_thread_index (&value);
1801       tnm = vec_elt_at_index (nm->per_thread_data, thread_index);
1802       u32 session_index = nat_value_get_session_index (&value);
1803       if (pool_is_free_index (tnm->sessions, session_index))
1804         return VNET_API_ERROR_UNSPECIFIED;
1805
1806       s = pool_elt_at_index (tnm->sessions, session_index);
1807       nat44_ei_free_session_data_v2 (nm, s, tnm - nm->per_thread_data, 0);
1808       nat44_ei_delete_session (nm, s, tnm - nm->per_thread_data);
1809       return 0;
1810     }
1811
1812   return VNET_API_ERROR_NO_SUCH_ENTRY;
1813 }
1814
1815 u32
1816 nat44_ei_get_thread_idx_by_port (u16 e_port)
1817 {
1818   nat44_ei_main_t *nm = &nat44_ei_main;
1819   u32 thread_idx = nm->num_workers;
1820   if (nm->num_workers > 1)
1821     {
1822       thread_idx = nm->first_worker_index +
1823                    nm->workers[(e_port - 1024) / nm->port_per_thread];
1824     }
1825   return thread_idx;
1826 }
1827
1828 void
1829 nat44_ei_add_del_addr_to_fib (ip4_address_t *addr, u8 p_len, u32 sw_if_index,
1830                               int is_add)
1831 {
1832   nat44_ei_main_t *nm = &nat44_ei_main;
1833   fib_prefix_t prefix = {
1834     .fp_len = p_len,
1835     .fp_proto = FIB_PROTOCOL_IP4,
1836     .fp_addr = {
1837                 .ip4.as_u32 = addr->as_u32,
1838                 },
1839   };
1840   u32 fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
1841
1842   if (is_add)
1843     fib_table_entry_update_one_path (
1844       fib_index, &prefix, nm->fib_src_low,
1845       (FIB_ENTRY_FLAG_CONNECTED | FIB_ENTRY_FLAG_LOCAL |
1846        FIB_ENTRY_FLAG_EXCLUSIVE),
1847       DPO_PROTO_IP4, NULL, sw_if_index, ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
1848   else
1849     fib_table_entry_delete (fib_index, &prefix, nm->fib_src_low);
1850 }
1851
1852 int
1853 nat44_ei_add_del_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
1854                                  u16 l_port, u16 e_port, nat_protocol_t proto,
1855                                  u32 sw_if_index, u32 vrf_id, u8 addr_only,
1856                                  u8 identity_nat, u8 *tag, u8 is_add)
1857 {
1858   nat44_ei_main_t *nm = &nat44_ei_main;
1859   nat44_ei_static_mapping_t *m = 0;
1860   clib_bihash_kv_8_8_t kv, value;
1861   nat44_ei_address_t *a = 0;
1862   u32 fib_index = ~0;
1863   nat44_ei_interface_t *interface;
1864   nat44_ei_main_per_thread_data_t *tnm;
1865   nat44_ei_user_key_t u_key;
1866   nat44_ei_user_t *u;
1867   dlist_elt_t *head, *elt;
1868   u32 elt_index, head_index;
1869   u32 ses_index;
1870   u64 user_index;
1871   nat44_ei_session_t *s;
1872   nat44_ei_static_map_resolve_t *rp, *rp_match = 0;
1873   nat44_ei_lb_addr_port_t *local;
1874   u32 find = ~0;
1875   int i;
1876
1877   if (sw_if_index != ~0)
1878     {
1879       ip4_address_t *first_int_addr;
1880
1881       for (i = 0; i < vec_len (nm->to_resolve); i++)
1882         {
1883           rp = nm->to_resolve + i;
1884           if (rp->sw_if_index != sw_if_index ||
1885               rp->l_addr.as_u32 != l_addr.as_u32 || rp->vrf_id != vrf_id ||
1886               rp->addr_only != addr_only)
1887             continue;
1888
1889           if (!addr_only)
1890             {
1891               if ((rp->l_port != l_port && rp->e_port != e_port) ||
1892                   rp->proto != proto)
1893                 continue;
1894             }
1895
1896           rp_match = rp;
1897           break;
1898         }
1899
1900       /* Might be already set... */
1901       first_int_addr = ip4_interface_first_address (
1902         nm->ip4_main, sw_if_index, 0 /* just want the address */);
1903
1904       if (is_add)
1905         {
1906           if (rp_match)
1907             return VNET_API_ERROR_VALUE_EXIST;
1908
1909           nat44_ei_add_static_mapping_when_resolved (
1910             l_addr, l_port, e_port, proto, sw_if_index, vrf_id, addr_only,
1911             identity_nat, tag);
1912
1913           /* DHCP resolution required? */
1914           if (!first_int_addr)
1915             return 0;
1916
1917           e_addr.as_u32 = first_int_addr->as_u32;
1918           /* Identity mapping? */
1919           if (l_addr.as_u32 == 0)
1920             l_addr.as_u32 = e_addr.as_u32;
1921         }
1922       else
1923         {
1924           if (!rp_match)
1925             return VNET_API_ERROR_NO_SUCH_ENTRY;
1926
1927           vec_del1 (nm->to_resolve, i);
1928
1929           if (!first_int_addr)
1930             return 0;
1931
1932           e_addr.as_u32 = first_int_addr->as_u32;
1933           /* Identity mapping? */
1934           if (l_addr.as_u32 == 0)
1935             l_addr.as_u32 = e_addr.as_u32;
1936         }
1937     }
1938
1939   init_nat_k (&kv, e_addr, addr_only ? 0 : e_port, 0, addr_only ? 0 : proto);
1940   if (!clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv, &value))
1941     m = pool_elt_at_index (nm->static_mappings, value.value);
1942
1943   if (is_add)
1944     {
1945       if (m)
1946         {
1947           // identity mapping for second vrf
1948           if (nat44_ei_is_identity_static_mapping (m))
1949             {
1950               pool_foreach (local, m->locals)
1951                 {
1952                   if (local->vrf_id == vrf_id)
1953                     return VNET_API_ERROR_VALUE_EXIST;
1954                 }
1955               pool_get (m->locals, local);
1956               local->vrf_id = vrf_id;
1957               local->fib_index = fib_table_find_or_create_and_lock (
1958                 FIB_PROTOCOL_IP4, vrf_id, nm->fib_src_low);
1959               init_nat_kv (&kv, m->local_addr, m->local_port, local->fib_index,
1960                            m->proto, 0, m - nm->static_mappings);
1961               clib_bihash_add_del_8_8 (&nm->static_mapping_by_local, &kv, 1);
1962               return 0;
1963             }
1964           return VNET_API_ERROR_VALUE_EXIST;
1965         }
1966
1967       /* Convert VRF id to FIB index */
1968       if (vrf_id != ~0)
1969         {
1970           fib_index = fib_table_find_or_create_and_lock (
1971             FIB_PROTOCOL_IP4, vrf_id, nm->fib_src_low);
1972         }
1973       /* If not specified use inside VRF id from NAT44 plugin config */
1974       else
1975         {
1976           fib_index = nm->inside_fib_index;
1977           vrf_id = nm->inside_vrf_id;
1978           fib_table_lock (fib_index, FIB_PROTOCOL_IP4, nm->fib_src_low);
1979         }
1980
1981       if (!identity_nat)
1982         {
1983           init_nat_k (&kv, l_addr, addr_only ? 0 : l_port, fib_index,
1984                       addr_only ? 0 : proto);
1985           if (!clib_bihash_search_8_8 (&nm->static_mapping_by_local, &kv,
1986                                        &value))
1987             return VNET_API_ERROR_VALUE_EXIST;
1988         }
1989
1990       /* Find external address in allocated addresses and reserve port for
1991          address and port pair mapping when dynamic translations enabled */
1992       if (!(addr_only || nm->static_mapping_only))
1993         {
1994           for (i = 0; i < vec_len (nm->addresses); i++)
1995             {
1996               if (nm->addresses[i].addr.as_u32 == e_addr.as_u32)
1997                 {
1998                   a = nm->addresses + i;
1999                   /* External port must be unused */
2000                   switch (proto)
2001                     {
2002 #define _(N, j, n, s)                                                         \
2003   case NAT_PROTOCOL_##N:                                                      \
2004     if (a->busy_##n##_port_refcounts[e_port])                                 \
2005       return VNET_API_ERROR_INVALID_VALUE;                                    \
2006     ++a->busy_##n##_port_refcounts[e_port];                                   \
2007     if (e_port > 1024)                                                        \
2008       {                                                                       \
2009         a->busy_##n##_ports++;                                                \
2010         a->busy_##n##_ports_per_thread[nat44_ei_get_thread_idx_by_port (      \
2011           e_port)]++;                                                         \
2012       }                                                                       \
2013     break;
2014                       foreach_nat_protocol
2015 #undef _
2016                         default : nat_elog_info (nm, "unknown protocol");
2017                       return VNET_API_ERROR_INVALID_VALUE_2;
2018                     }
2019                   break;
2020                 }
2021             }
2022           /* External address must be allocated */
2023           if (!a && (l_addr.as_u32 != e_addr.as_u32))
2024             {
2025               if (sw_if_index != ~0)
2026                 {
2027                   for (i = 0; i < vec_len (nm->to_resolve); i++)
2028                     {
2029                       rp = nm->to_resolve + i;
2030                       if (rp->addr_only)
2031                         continue;
2032                       if (rp->sw_if_index != sw_if_index &&
2033                           rp->l_addr.as_u32 != l_addr.as_u32 &&
2034                           rp->vrf_id != vrf_id && rp->l_port != l_port &&
2035                           rp->e_port != e_port && rp->proto != proto)
2036                         continue;
2037
2038                       vec_del1 (nm->to_resolve, i);
2039                       break;
2040                     }
2041                 }
2042               return VNET_API_ERROR_NO_SUCH_ENTRY;
2043             }
2044         }
2045
2046       pool_get (nm->static_mappings, m);
2047       clib_memset (m, 0, sizeof (*m));
2048       m->tag = vec_dup (tag);
2049       m->local_addr = l_addr;
2050       m->external_addr = e_addr;
2051
2052       if (addr_only)
2053         m->flags |= NAT44_EI_STATIC_MAPPING_FLAG_ADDR_ONLY;
2054       else
2055         {
2056           m->local_port = l_port;
2057           m->external_port = e_port;
2058           m->proto = proto;
2059         }
2060
2061       if (identity_nat)
2062         {
2063           m->flags |= NAT44_EI_STATIC_MAPPING_FLAG_IDENTITY_NAT;
2064           pool_get (m->locals, local);
2065           local->vrf_id = vrf_id;
2066           local->fib_index = fib_index;
2067         }
2068       else
2069         {
2070           m->vrf_id = vrf_id;
2071           m->fib_index = fib_index;
2072         }
2073
2074       if (nm->num_workers > 1)
2075         {
2076           ip4_header_t ip = {
2077             .src_address = m->local_addr,
2078           };
2079           vec_add1 (m->workers,
2080                     nat44_ei_get_in2out_worker_index (&ip, m->fib_index, 0));
2081           tnm = vec_elt_at_index (nm->per_thread_data, m->workers[0]);
2082         }
2083       else
2084         tnm = vec_elt_at_index (nm->per_thread_data, nm->num_workers);
2085
2086       init_nat_kv (&kv, m->local_addr, m->local_port, fib_index, m->proto, 0,
2087                    m - nm->static_mappings);
2088       clib_bihash_add_del_8_8 (&nm->static_mapping_by_local, &kv, 1);
2089
2090       init_nat_kv (&kv, m->external_addr, m->external_port, 0, m->proto, 0,
2091                    m - nm->static_mappings);
2092       clib_bihash_add_del_8_8 (&nm->static_mapping_by_external, &kv, 1);
2093
2094       /* Delete dynamic sessions matching local address (+ local port) */
2095       // TODO: based on type of NAT EI/ED
2096       if (!(nm->static_mapping_only))
2097         {
2098           u_key.addr = m->local_addr;
2099           u_key.fib_index = m->fib_index;
2100           kv.key = u_key.as_u64;
2101           if (!clib_bihash_search_8_8 (&tnm->user_hash, &kv, &value))
2102             {
2103               user_index = value.value;
2104               u = pool_elt_at_index (tnm->users, user_index);
2105               if (u->nsessions)
2106                 {
2107                   head_index = u->sessions_per_user_list_head_index;
2108                   head = pool_elt_at_index (tnm->list_pool, head_index);
2109                   elt_index = head->next;
2110                   elt = pool_elt_at_index (tnm->list_pool, elt_index);
2111                   ses_index = elt->value;
2112                   while (ses_index != ~0)
2113                     {
2114                       s = pool_elt_at_index (tnm->sessions, ses_index);
2115                       elt = pool_elt_at_index (tnm->list_pool, elt->next);
2116                       ses_index = elt->value;
2117
2118                       if (nat44_ei_is_session_static (s))
2119                         continue;
2120
2121                       if (!addr_only && s->in2out.port != m->local_port)
2122                         continue;
2123
2124                       nat44_ei_free_session_data_v2 (
2125                         nm, s, tnm - nm->per_thread_data, 0);
2126                       nat44_ei_delete_session (nm, s,
2127                                                tnm - nm->per_thread_data);
2128
2129                       if (!addr_only)
2130                         break;
2131                     }
2132                 }
2133             }
2134         }
2135     }
2136   else
2137     {
2138       if (!m)
2139         {
2140           if (sw_if_index != ~0)
2141             return 0;
2142           else
2143             return VNET_API_ERROR_NO_SUCH_ENTRY;
2144         }
2145
2146       if (identity_nat)
2147         {
2148           if (vrf_id == ~0)
2149             vrf_id = nm->inside_vrf_id;
2150
2151           pool_foreach (local, m->locals)
2152             {
2153               if (local->vrf_id == vrf_id)
2154                 find = local - m->locals;
2155             }
2156           if (find == ~0)
2157             return VNET_API_ERROR_NO_SUCH_ENTRY;
2158
2159           local = pool_elt_at_index (m->locals, find);
2160           fib_index = local->fib_index;
2161           pool_put (m->locals, local);
2162         }
2163       else
2164         fib_index = m->fib_index;
2165
2166       /* Free external address port */
2167       if (!(addr_only || nm->static_mapping_only))
2168         {
2169           for (i = 0; i < vec_len (nm->addresses); i++)
2170             {
2171               if (nm->addresses[i].addr.as_u32 == e_addr.as_u32)
2172                 {
2173                   a = nm->addresses + i;
2174                   switch (proto)
2175                     {
2176 #define _(N, j, n, s)                                                         \
2177   case NAT_PROTOCOL_##N:                                                      \
2178     --a->busy_##n##_port_refcounts[e_port];                                   \
2179     if (e_port > 1024)                                                        \
2180       {                                                                       \
2181         a->busy_##n##_ports--;                                                \
2182         a->busy_##n##_ports_per_thread[nat44_ei_get_thread_idx_by_port (      \
2183           e_port)]--;                                                         \
2184       }                                                                       \
2185     break;
2186                       foreach_nat_protocol
2187 #undef _
2188                         default : return VNET_API_ERROR_INVALID_VALUE_2;
2189                     }
2190                   break;
2191                 }
2192             }
2193         }
2194
2195       if (nm->num_workers > 1)
2196         tnm = vec_elt_at_index (nm->per_thread_data, m->workers[0]);
2197       else
2198         tnm = vec_elt_at_index (nm->per_thread_data, nm->num_workers);
2199
2200       init_nat_k (&kv, m->local_addr, m->local_port, fib_index, m->proto);
2201       clib_bihash_add_del_8_8 (&nm->static_mapping_by_local, &kv, 0);
2202
2203       /* Delete session(s) for static mapping if exist */
2204       if (!(nm->static_mapping_only) ||
2205           (nm->static_mapping_only && nm->static_mapping_connection_tracking))
2206         {
2207           u_key.addr = m->local_addr;
2208           u_key.fib_index = fib_index;
2209           kv.key = u_key.as_u64;
2210           nat44_ei_static_mapping_del_sessions (nm, tnm, u_key, addr_only,
2211                                                 e_addr, e_port);
2212         }
2213
2214       fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, nm->fib_src_low);
2215       if (pool_elts (m->locals))
2216         return 0;
2217
2218       init_nat_k (&kv, m->external_addr, m->external_port, 0, m->proto);
2219       clib_bihash_add_del_8_8 (&nm->static_mapping_by_external, &kv, 0);
2220
2221       vec_free (m->tag);
2222       vec_free (m->workers);
2223       /* Delete static mapping from pool */
2224       pool_put (nm->static_mappings, m);
2225     }
2226
2227   if (!addr_only || (l_addr.as_u32 == e_addr.as_u32))
2228     return 0;
2229
2230   /* Add/delete external address to FIB */
2231   pool_foreach (interface, nm->interfaces)
2232     {
2233       if (nat44_ei_interface_is_inside (interface) || nm->out2in_dpo)
2234         continue;
2235
2236       nat44_ei_add_del_addr_to_fib (&e_addr, 32, interface->sw_if_index,
2237                                     is_add);
2238       break;
2239     }
2240   pool_foreach (interface, nm->output_feature_interfaces)
2241     {
2242       if (nat44_ei_interface_is_inside (interface) || nm->out2in_dpo)
2243         continue;
2244
2245       nat44_ei_add_del_addr_to_fib (&e_addr, 32, interface->sw_if_index,
2246                                     is_add);
2247       break;
2248     }
2249   return 0;
2250 }
2251
2252 int
2253 nat44_ei_static_mapping_match (ip4_address_t match_addr, u16 match_port,
2254                                u32 match_fib_index,
2255                                nat_protocol_t match_protocol,
2256                                ip4_address_t *mapping_addr, u16 *mapping_port,
2257                                u32 *mapping_fib_index, u8 by_external,
2258                                u8 *is_addr_only, u8 *is_identity_nat)
2259 {
2260   nat44_ei_main_t *nm = &nat44_ei_main;
2261   clib_bihash_kv_8_8_t kv, value;
2262   nat44_ei_static_mapping_t *m;
2263   u16 port;
2264
2265   if (by_external)
2266     {
2267       init_nat_k (&kv, match_addr, match_port, 0, match_protocol);
2268       if (clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv,
2269                                   &value))
2270         {
2271           /* Try address only mapping */
2272           init_nat_k (&kv, match_addr, 0, 0, 0);
2273           if (clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv,
2274                                       &value))
2275             return 1;
2276         }
2277       m = pool_elt_at_index (nm->static_mappings, value.value);
2278
2279       *mapping_fib_index = m->fib_index;
2280       *mapping_addr = m->local_addr;
2281       port = m->local_port;
2282     }
2283   else
2284     {
2285       init_nat_k (&kv, match_addr, match_port, match_fib_index,
2286                   match_protocol);
2287       if (clib_bihash_search_8_8 (&nm->static_mapping_by_local, &kv, &value))
2288         {
2289           /* Try address only mapping */
2290           init_nat_k (&kv, match_addr, 0, match_fib_index, 0);
2291           if (clib_bihash_search_8_8 (&nm->static_mapping_by_local, &kv,
2292                                       &value))
2293             return 1;
2294         }
2295       m = pool_elt_at_index (nm->static_mappings, value.value);
2296
2297       *mapping_fib_index = nm->outside_fib_index;
2298       *mapping_addr = m->external_addr;
2299       port = m->external_port;
2300     }
2301
2302   /* Address only mapping doesn't change port */
2303   if (nat44_ei_is_addr_only_static_mapping (m))
2304     *mapping_port = match_port;
2305   else
2306     *mapping_port = port;
2307
2308   if (PREDICT_FALSE (is_addr_only != 0))
2309     *is_addr_only = nat44_ei_is_addr_only_static_mapping (m);
2310
2311   if (PREDICT_FALSE (is_identity_nat != 0))
2312     *is_identity_nat = nat44_ei_is_identity_static_mapping (m);
2313
2314   return 0;
2315 }
2316
2317 static void
2318 nat44_ei_worker_db_free (nat44_ei_main_per_thread_data_t *tnm)
2319 {
2320   pool_free (tnm->list_pool);
2321   pool_free (tnm->lru_pool);
2322   pool_free (tnm->sessions);
2323   pool_free (tnm->users);
2324
2325   clib_bihash_free_8_8 (&tnm->user_hash);
2326 }
2327
2328 u8 *
2329 format_nat44_ei_key (u8 *s, va_list *args)
2330 {
2331   u64 key = va_arg (*args, u64);
2332
2333   ip4_address_t addr;
2334   u16 port;
2335   nat_protocol_t protocol;
2336   u32 fib_index;
2337
2338   split_nat_key (key, &addr, &port, &fib_index, &protocol);
2339
2340   s = format (s, "%U proto %U port %d fib %d", format_ip4_address, &addr,
2341               format_nat_protocol, protocol, clib_net_to_host_u16 (port),
2342               fib_index);
2343   return s;
2344 }
2345
2346 u8 *
2347 format_nat44_ei_user_kvp (u8 *s, va_list *args)
2348 {
2349   clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *);
2350   nat44_ei_user_key_t k;
2351
2352   k.as_u64 = v->key;
2353
2354   s = format (s, "%U fib %d user-index %llu", format_ip4_address, &k.addr,
2355               k.fib_index, v->value);
2356
2357   return s;
2358 }
2359
2360 u8 *
2361 format_nat44_ei_session_kvp (u8 *s, va_list *args)
2362 {
2363   clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *);
2364
2365   s = format (s, "%U thread-index %llu session-index %llu",
2366               format_nat44_ei_key, v->key, nat_value_get_thread_index (v),
2367               nat_value_get_session_index (v));
2368
2369   return s;
2370 }
2371
2372 u8 *
2373 format_nat44_ei_static_mapping_kvp (u8 *s, va_list *args)
2374 {
2375   clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *);
2376
2377   s = format (s, "%U static-mapping-index %llu", format_nat44_ei_key, v->key,
2378               v->value);
2379
2380   return s;
2381 }
2382
2383 static void
2384 nat44_ei_worker_db_init (nat44_ei_main_per_thread_data_t *tnm,
2385                          u32 translations, u32 translation_buckets,
2386                          u32 user_buckets)
2387 {
2388   dlist_elt_t *head;
2389
2390   pool_alloc (tnm->list_pool, translations);
2391   pool_alloc (tnm->lru_pool, translations);
2392   pool_alloc (tnm->sessions, translations);
2393
2394   clib_bihash_init_8_8 (&tnm->user_hash, "users", user_buckets, 0);
2395
2396   clib_bihash_set_kvp_format_fn_8_8 (&tnm->user_hash,
2397                                      format_nat44_ei_user_kvp);
2398
2399   pool_get (tnm->lru_pool, head);
2400   tnm->tcp_trans_lru_head_index = head - tnm->lru_pool;
2401   clib_dlist_init (tnm->lru_pool, tnm->tcp_trans_lru_head_index);
2402
2403   pool_get (tnm->lru_pool, head);
2404   tnm->tcp_estab_lru_head_index = head - tnm->lru_pool;
2405   clib_dlist_init (tnm->lru_pool, tnm->tcp_estab_lru_head_index);
2406
2407   pool_get (tnm->lru_pool, head);
2408   tnm->udp_lru_head_index = head - tnm->lru_pool;
2409   clib_dlist_init (tnm->lru_pool, tnm->udp_lru_head_index);
2410
2411   pool_get (tnm->lru_pool, head);
2412   tnm->icmp_lru_head_index = head - tnm->lru_pool;
2413   clib_dlist_init (tnm->lru_pool, tnm->icmp_lru_head_index);
2414
2415   pool_get (tnm->lru_pool, head);
2416   tnm->unk_proto_lru_head_index = head - tnm->lru_pool;
2417   clib_dlist_init (tnm->lru_pool, tnm->unk_proto_lru_head_index);
2418 }
2419
2420 static void
2421 nat44_ei_db_free ()
2422 {
2423   nat44_ei_main_t *nm = &nat44_ei_main;
2424   nat44_ei_main_per_thread_data_t *tnm;
2425
2426   pool_free (nm->static_mappings);
2427   clib_bihash_free_8_8 (&nm->static_mapping_by_local);
2428   clib_bihash_free_8_8 (&nm->static_mapping_by_external);
2429
2430   if (nm->pat)
2431     {
2432       clib_bihash_free_8_8 (&nm->in2out);
2433       clib_bihash_free_8_8 (&nm->out2in);
2434       vec_foreach (tnm, nm->per_thread_data)
2435         {
2436           nat44_ei_worker_db_free (tnm);
2437         }
2438     }
2439 }
2440
2441 static void
2442 nat44_ei_db_init (u32 translations, u32 translation_buckets, u32 user_buckets)
2443 {
2444   nat44_ei_main_t *nm = &nat44_ei_main;
2445   nat44_ei_main_per_thread_data_t *tnm;
2446
2447   u32 static_mapping_buckets = 1024;
2448   u32 static_mapping_memory_size = 64 << 20;
2449
2450   clib_bihash_init_8_8 (&nm->static_mapping_by_local,
2451                         "static_mapping_by_local", static_mapping_buckets,
2452                         static_mapping_memory_size);
2453   clib_bihash_init_8_8 (&nm->static_mapping_by_external,
2454                         "static_mapping_by_external", static_mapping_buckets,
2455                         static_mapping_memory_size);
2456   clib_bihash_set_kvp_format_fn_8_8 (&nm->static_mapping_by_local,
2457                                      format_nat44_ei_static_mapping_kvp);
2458   clib_bihash_set_kvp_format_fn_8_8 (&nm->static_mapping_by_external,
2459                                      format_nat44_ei_static_mapping_kvp);
2460
2461   if (nm->pat)
2462     {
2463       clib_bihash_init_8_8 (&nm->in2out, "in2out", translation_buckets, 0);
2464       clib_bihash_init_8_8 (&nm->out2in, "out2in", translation_buckets, 0);
2465       clib_bihash_set_kvp_format_fn_8_8 (&nm->in2out,
2466                                          format_nat44_ei_session_kvp);
2467       clib_bihash_set_kvp_format_fn_8_8 (&nm->out2in,
2468                                          format_nat44_ei_session_kvp);
2469       vec_foreach (tnm, nm->per_thread_data)
2470         {
2471           nat44_ei_worker_db_init (tnm, translations, translation_buckets,
2472                                    user_buckets);
2473         }
2474     }
2475 }
2476
2477 void
2478 nat44_ei_sessions_clear ()
2479 {
2480   nat44_ei_main_t *nm = &nat44_ei_main;
2481   nat44_ei_main_per_thread_data_t *tnm;
2482
2483   if (nm->pat)
2484     {
2485       clib_bihash_free_8_8 (&nm->in2out);
2486       clib_bihash_free_8_8 (&nm->out2in);
2487       clib_bihash_init_8_8 (&nm->in2out, "in2out", nm->translation_buckets, 0);
2488       clib_bihash_init_8_8 (&nm->out2in, "out2in", nm->translation_buckets, 0);
2489       clib_bihash_set_kvp_format_fn_8_8 (&nm->in2out,
2490                                          format_nat44_ei_session_kvp);
2491       clib_bihash_set_kvp_format_fn_8_8 (&nm->out2in,
2492                                          format_nat44_ei_session_kvp);
2493       vec_foreach (tnm, nm->per_thread_data)
2494         {
2495           nat44_ei_worker_db_free (tnm);
2496           nat44_ei_worker_db_init (tnm, nm->translations,
2497                                    nm->translation_buckets, nm->user_buckets);
2498         }
2499     }
2500
2501   vlib_zero_simple_counter (&nm->total_users, 0);
2502   vlib_zero_simple_counter (&nm->total_sessions, 0);
2503   vlib_zero_simple_counter (&nm->user_limit_reached, 0);
2504 }
2505
2506 static void
2507 nat44_ei_update_outside_fib (ip4_main_t *im, uword opaque, u32 sw_if_index,
2508                              u32 new_fib_index, u32 old_fib_index)
2509 {
2510   nat44_ei_main_t *nm = &nat44_ei_main;
2511   nat44_ei_outside_fib_t *outside_fib;
2512   nat44_ei_interface_t *i;
2513   u8 is_add = 1;
2514   u8 match = 0;
2515
2516   if (!nm->enabled || (new_fib_index == old_fib_index) ||
2517       (!vec_len (nm->outside_fibs)))
2518     {
2519       return;
2520     }
2521
2522   pool_foreach (i, nm->interfaces)
2523     {
2524       if (i->sw_if_index == sw_if_index)
2525         {
2526           if (!(nat44_ei_interface_is_outside (i)))
2527             return;
2528           match = 1;
2529         }
2530     }
2531
2532   pool_foreach (i, nm->output_feature_interfaces)
2533     {
2534       if (i->sw_if_index == sw_if_index)
2535         {
2536           if (!(nat44_ei_interface_is_outside (i)))
2537             return;
2538           match = 1;
2539         }
2540     }
2541
2542   if (!match)
2543     return;
2544
2545   vec_foreach (outside_fib, nm->outside_fibs)
2546     {
2547       if (outside_fib->fib_index == old_fib_index)
2548         {
2549           outside_fib->refcount--;
2550           if (!outside_fib->refcount)
2551             vec_del1 (nm->outside_fibs, outside_fib - nm->outside_fibs);
2552           break;
2553         }
2554     }
2555
2556   vec_foreach (outside_fib, nm->outside_fibs)
2557     {
2558       if (outside_fib->fib_index == new_fib_index)
2559         {
2560           outside_fib->refcount++;
2561           is_add = 0;
2562           break;
2563         }
2564     }
2565
2566   if (is_add)
2567     {
2568       vec_add2 (nm->outside_fibs, outside_fib, 1);
2569       outside_fib->refcount = 1;
2570       outside_fib->fib_index = new_fib_index;
2571     }
2572 }
2573
2574 int
2575 nat44_ei_add_address (nat44_ei_main_t *nm, ip4_address_t *addr, u32 vrf_id)
2576 {
2577   nat44_ei_address_t *ap;
2578   nat44_ei_interface_t *i;
2579   vlib_thread_main_t *tm = vlib_get_thread_main ();
2580
2581   /* Check if address already exists */
2582   vec_foreach (ap, nm->addresses)
2583     {
2584       if (ap->addr.as_u32 == addr->as_u32)
2585         {
2586           nat44_ei_log_err ("address exist");
2587           return VNET_API_ERROR_VALUE_EXIST;
2588         }
2589     }
2590
2591   vec_add2 (nm->addresses, ap, 1);
2592
2593   ap->addr = *addr;
2594   if (vrf_id != ~0)
2595     ap->fib_index = fib_table_find_or_create_and_lock (
2596       FIB_PROTOCOL_IP4, vrf_id, nm->fib_src_low);
2597   else
2598     ap->fib_index = ~0;
2599
2600 #define _(N, i, n, s)                                                         \
2601   clib_memset (ap->busy_##n##_port_refcounts, 0,                              \
2602                sizeof (ap->busy_##n##_port_refcounts));                       \
2603   ap->busy_##n##_ports = 0;                                                   \
2604   ap->busy_##n##_ports_per_thread = 0;                                        \
2605   vec_validate_init_empty (ap->busy_##n##_ports_per_thread,                   \
2606                            tm->n_vlib_mains - 1, 0);
2607   foreach_nat_protocol
2608 #undef _
2609
2610     /* Add external address to FIB */
2611     pool_foreach (i, nm->interfaces)
2612   {
2613     if (nat44_ei_interface_is_inside (i) || nm->out2in_dpo)
2614       continue;
2615
2616     nat44_ei_add_del_addr_to_fib (addr, 32, i->sw_if_index, 1);
2617     break;
2618   }
2619   pool_foreach (i, nm->output_feature_interfaces)
2620     {
2621       if (nat44_ei_interface_is_inside (i) || nm->out2in_dpo)
2622         continue;
2623
2624       nat44_ei_add_del_addr_to_fib (addr, 32, i->sw_if_index, 1);
2625       break;
2626     }
2627
2628   return 0;
2629 }
2630
2631 int
2632 nat44_ei_add_interface_address (nat44_ei_main_t *nm, u32 sw_if_index,
2633                                 int is_del)
2634 {
2635   ip4_main_t *ip4_main = nm->ip4_main;
2636   ip4_address_t *first_int_addr;
2637   nat44_ei_static_map_resolve_t *rp;
2638   u32 *indices_to_delete = 0;
2639   int i, j;
2640   u32 *auto_add_sw_if_indices = nm->auto_add_sw_if_indices;
2641
2642   first_int_addr = ip4_interface_first_address (ip4_main, sw_if_index,
2643                                                 0 /* just want the address */);
2644
2645   for (i = 0; i < vec_len (auto_add_sw_if_indices); i++)
2646     {
2647       if (auto_add_sw_if_indices[i] == sw_if_index)
2648         {
2649           if (is_del)
2650             {
2651               /* if have address remove it */
2652               if (first_int_addr)
2653                 (void) nat44_ei_del_address (nm, first_int_addr[0], 1);
2654               else
2655                 {
2656                   for (j = 0; j < vec_len (nm->to_resolve); j++)
2657                     {
2658                       rp = nm->to_resolve + j;
2659                       if (rp->sw_if_index == sw_if_index)
2660                         vec_add1 (indices_to_delete, j);
2661                     }
2662                   if (vec_len (indices_to_delete))
2663                     {
2664                       for (j = vec_len (indices_to_delete) - 1; j >= 0; j--)
2665                         vec_del1 (nm->to_resolve, j);
2666                       vec_free (indices_to_delete);
2667                     }
2668                 }
2669               vec_del1 (nm->auto_add_sw_if_indices, i);
2670             }
2671           else
2672             return VNET_API_ERROR_VALUE_EXIST;
2673
2674           return 0;
2675         }
2676     }
2677
2678   if (is_del)
2679     return VNET_API_ERROR_NO_SUCH_ENTRY;
2680
2681   /* add to the auto-address list */
2682   vec_add1 (nm->auto_add_sw_if_indices, sw_if_index);
2683
2684   /* If the address is already bound - or static - add it now */
2685   if (first_int_addr)
2686     (void) nat44_ei_add_address (nm, first_int_addr, ~0);
2687
2688   return 0;
2689 }
2690
2691 static int
2692 nat44_ei_is_address_used_in_static_mapping (ip4_address_t addr)
2693 {
2694   nat44_ei_main_t *nm = &nat44_ei_main;
2695   nat44_ei_static_mapping_t *m;
2696   pool_foreach (m, nm->static_mappings)
2697     {
2698       if (nat44_ei_is_addr_only_static_mapping (m) ||
2699           nat44_ei_is_identity_static_mapping (m))
2700         continue;
2701       if (m->external_addr.as_u32 == addr.as_u32)
2702         return 1;
2703     }
2704   return 0;
2705 }
2706
2707 int
2708 nat44_ei_del_address (nat44_ei_main_t *nm, ip4_address_t addr, u8 delete_sm)
2709 {
2710   nat44_ei_address_t *a = 0;
2711   nat44_ei_session_t *ses;
2712   u32 *ses_to_be_removed = 0, *ses_index;
2713   nat44_ei_main_per_thread_data_t *tnm;
2714   nat44_ei_interface_t *interface;
2715   nat44_ei_static_mapping_t *m;
2716   int i;
2717
2718   /* Find SNAT address */
2719   for (i = 0; i < vec_len (nm->addresses); i++)
2720     {
2721       if (nm->addresses[i].addr.as_u32 == addr.as_u32)
2722         {
2723           a = nm->addresses + i;
2724           break;
2725         }
2726     }
2727   if (!a)
2728     {
2729       nat44_ei_log_err ("no such address");
2730       return VNET_API_ERROR_NO_SUCH_ENTRY;
2731     }
2732
2733   if (delete_sm)
2734     {
2735       pool_foreach (m, nm->static_mappings)
2736         {
2737           if (m->external_addr.as_u32 == addr.as_u32)
2738             (void) nat44_ei_add_del_static_mapping (
2739               m->local_addr, m->external_addr, m->local_port, m->external_port,
2740               m->proto, ~0 /* sw_if_index */, m->vrf_id,
2741               nat44_ei_is_addr_only_static_mapping (m),
2742               nat44_ei_is_identity_static_mapping (m), m->tag, 0);
2743         }
2744     }
2745   else
2746     {
2747       /* Check if address is used in some static mapping */
2748       if (nat44_ei_is_address_used_in_static_mapping (addr))
2749         {
2750           nat44_ei_log_err ("address used in static mapping");
2751           return VNET_API_ERROR_UNSPECIFIED;
2752         }
2753     }
2754
2755   if (a->fib_index != ~0)
2756     fib_table_unlock (a->fib_index, FIB_PROTOCOL_IP4, nm->fib_src_low);
2757
2758   /* Delete sessions using address */
2759   if (a->busy_tcp_ports || a->busy_udp_ports || a->busy_icmp_ports)
2760     {
2761       vec_foreach (tnm, nm->per_thread_data)
2762         {
2763           pool_foreach (ses, tnm->sessions)
2764             {
2765               if (ses->out2in.addr.as_u32 == addr.as_u32)
2766                 {
2767                   nat44_ei_free_session_data (nm, ses,
2768                                               tnm - nm->per_thread_data, 0);
2769                   vec_add1 (ses_to_be_removed, ses - tnm->sessions);
2770                 }
2771             }
2772           vec_foreach (ses_index, ses_to_be_removed)
2773             {
2774               ses = pool_elt_at_index (tnm->sessions, ses_index[0]);
2775               nat44_ei_delete_session (nm, ses, tnm - nm->per_thread_data);
2776             }
2777           vec_free (ses_to_be_removed);
2778         }
2779     }
2780
2781 #define _(N, i, n, s) vec_free (a->busy_##n##_ports_per_thread);
2782   foreach_nat_protocol
2783 #undef _
2784     vec_del1 (nm->addresses, i);
2785
2786   /* Delete external address from FIB */
2787   pool_foreach (interface, nm->interfaces)
2788     {
2789       if (nat44_ei_interface_is_inside (interface) || nm->out2in_dpo)
2790         continue;
2791       nat44_ei_add_del_addr_to_fib (&addr, 32, interface->sw_if_index, 0);
2792       break;
2793     }
2794
2795   pool_foreach (interface, nm->output_feature_interfaces)
2796     {
2797       if (nat44_ei_interface_is_inside (interface) || nm->out2in_dpo)
2798         continue;
2799       nat44_ei_add_del_addr_to_fib (&addr, 32, interface->sw_if_index, 0);
2800       break;
2801     }
2802
2803   return 0;
2804 }
2805
2806 static void
2807 nat44_ei_ip4_add_del_interface_address_cb (ip4_main_t *im, uword opaque,
2808                                            u32 sw_if_index,
2809                                            ip4_address_t *address,
2810                                            u32 address_length,
2811                                            u32 if_address_index, u32 is_delete)
2812 {
2813   nat44_ei_main_t *nm = &nat44_ei_main;
2814   nat44_ei_static_map_resolve_t *rp;
2815   ip4_address_t l_addr;
2816   int i, j;
2817   int rv;
2818   nat44_ei_address_t *addresses = nm->addresses;
2819
2820   if (!nm->enabled)
2821     return;
2822
2823   for (i = 0; i < vec_len (nm->auto_add_sw_if_indices); i++)
2824     {
2825       if (sw_if_index == nm->auto_add_sw_if_indices[i])
2826         goto match;
2827     }
2828
2829   return;
2830
2831 match:
2832   if (!is_delete)
2833     {
2834       /* Don't trip over lease renewal, static config */
2835       for (j = 0; j < vec_len (addresses); j++)
2836         if (addresses[j].addr.as_u32 == address->as_u32)
2837           return;
2838
2839       (void) nat44_ei_add_address (nm, address, ~0);
2840       /* Scan static map resolution vector */
2841       for (j = 0; j < vec_len (nm->to_resolve); j++)
2842         {
2843           rp = nm->to_resolve + j;
2844           if (rp->addr_only)
2845             continue;
2846           /* On this interface? */
2847           if (rp->sw_if_index == sw_if_index)
2848             {
2849               /* Indetity mapping? */
2850               if (rp->l_addr.as_u32 == 0)
2851                 l_addr.as_u32 = address[0].as_u32;
2852               else
2853                 l_addr.as_u32 = rp->l_addr.as_u32;
2854               /* Add the static mapping */
2855               rv = nat44_ei_add_del_static_mapping (
2856                 l_addr, address[0], rp->l_port, rp->e_port, rp->proto,
2857                 ~0 /* sw_if_index */, rp->vrf_id, rp->addr_only,
2858                 rp->identity_nat, rp->tag, 1);
2859               if (rv)
2860                 nat_elog_notice_X1 (
2861                   nm, "nat44_ei_add_del_static_mapping returned %d", "i4", rv);
2862             }
2863         }
2864       return;
2865     }
2866   else
2867     {
2868       (void) nat44_ei_del_address (nm, address[0], 1);
2869       return;
2870     }
2871 }
2872
2873 int
2874 nat44_ei_set_frame_queue_nelts (u32 frame_queue_nelts)
2875 {
2876   fail_if_enabled ();
2877   nat44_ei_main_t *nm = &nat44_ei_main;
2878   nm->frame_queue_nelts = frame_queue_nelts;
2879   return 0;
2880 }
2881
2882 static void
2883 nat44_ei_ip4_add_del_addr_only_sm_cb (ip4_main_t *im, uword opaque,
2884                                       u32 sw_if_index, ip4_address_t *address,
2885                                       u32 address_length, u32 if_address_index,
2886                                       u32 is_delete)
2887 {
2888   nat44_ei_main_t *nm = &nat44_ei_main;
2889   nat44_ei_static_map_resolve_t *rp;
2890   nat44_ei_static_mapping_t *m;
2891   clib_bihash_kv_8_8_t kv, value;
2892   int i, rv;
2893   ip4_address_t l_addr;
2894
2895   if (!nm->enabled)
2896     return;
2897
2898   for (i = 0; i < vec_len (nm->to_resolve); i++)
2899     {
2900       rp = nm->to_resolve + i;
2901       if (rp->addr_only == 0)
2902         continue;
2903       if (rp->sw_if_index == sw_if_index)
2904         goto match;
2905     }
2906
2907   return;
2908
2909 match:
2910   init_nat_k (&kv, *address, rp->addr_only ? 0 : rp->e_port,
2911               nm->outside_fib_index, rp->addr_only ? 0 : rp->proto);
2912   if (clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv, &value))
2913     m = 0;
2914   else
2915     m = pool_elt_at_index (nm->static_mappings, value.value);
2916
2917   if (!is_delete)
2918     {
2919       /* Don't trip over lease renewal, static config */
2920       if (m)
2921         return;
2922     }
2923   else
2924     {
2925       if (!m)
2926         return;
2927     }
2928
2929   /* Indetity mapping? */
2930   if (rp->l_addr.as_u32 == 0)
2931     l_addr.as_u32 = address[0].as_u32;
2932   else
2933     l_addr.as_u32 = rp->l_addr.as_u32;
2934   /* Add the static mapping */
2935
2936   rv = nat44_ei_add_del_static_mapping (
2937     l_addr, address[0], rp->l_port, rp->e_port, rp->proto,
2938     ~0 /* sw_if_index */, rp->vrf_id, rp->addr_only, rp->identity_nat, rp->tag,
2939     !is_delete);
2940   if (rv)
2941     nat_elog_notice_X1 (nm, "nat44_ei_add_del_static_mapping returned %d",
2942                         "i4", rv);
2943 }
2944
2945 static_always_inline uword
2946 nat44_ei_classify_inline_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
2947                              vlib_frame_t *frame)
2948 {
2949   u32 n_left_from, *from, *to_next;
2950   nat44_ei_classify_next_t next_index;
2951   nat44_ei_main_t *nm = &nat44_ei_main;
2952   nat44_ei_static_mapping_t *m;
2953   u32 next_in2out = 0, next_out2in = 0;
2954
2955   from = vlib_frame_vector_args (frame);
2956   n_left_from = frame->n_vectors;
2957   next_index = node->cached_next_index;
2958
2959   while (n_left_from > 0)
2960     {
2961       u32 n_left_to_next;
2962
2963       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2964
2965       while (n_left_from > 0 && n_left_to_next > 0)
2966         {
2967           u32 bi0;
2968           vlib_buffer_t *b0;
2969           u32 next0 = NAT44_EI_CLASSIFY_NEXT_IN2OUT;
2970           ip4_header_t *ip0;
2971           nat44_ei_address_t *ap;
2972           clib_bihash_kv_8_8_t kv0, value0;
2973
2974           /* speculatively enqueue b0 to the current next frame */
2975           bi0 = from[0];
2976           to_next[0] = bi0;
2977           from += 1;
2978           to_next += 1;
2979           n_left_from -= 1;
2980           n_left_to_next -= 1;
2981
2982           b0 = vlib_get_buffer (vm, bi0);
2983           ip0 = vlib_buffer_get_current (b0);
2984
2985           vec_foreach (ap, nm->addresses)
2986             {
2987               if (ip0->dst_address.as_u32 == ap->addr.as_u32)
2988                 {
2989                   next0 = NAT44_EI_CLASSIFY_NEXT_OUT2IN;
2990                   goto enqueue0;
2991                 }
2992             }
2993
2994           if (PREDICT_FALSE (pool_elts (nm->static_mappings)))
2995             {
2996               init_nat_k (&kv0, ip0->dst_address, 0, 0, 0);
2997               /* try to classify the fragment based on IP header alone */
2998               if (!clib_bihash_search_8_8 (&nm->static_mapping_by_external,
2999                                            &kv0, &value0))
3000                 {
3001                   m = pool_elt_at_index (nm->static_mappings, value0.value);
3002                   if (m->local_addr.as_u32 != m->external_addr.as_u32)
3003                     next0 = NAT44_EI_CLASSIFY_NEXT_OUT2IN;
3004                   goto enqueue0;
3005                 }
3006               init_nat_k (&kv0, ip0->dst_address,
3007                           vnet_buffer (b0)->ip.reass.l4_dst_port, 0,
3008                           ip_proto_to_nat_proto (ip0->protocol));
3009               if (!clib_bihash_search_8_8 (&nm->static_mapping_by_external,
3010                                            &kv0, &value0))
3011                 {
3012                   m = pool_elt_at_index (nm->static_mappings, value0.value);
3013                   if (m->local_addr.as_u32 != m->external_addr.as_u32)
3014                     next0 = NAT44_EI_CLASSIFY_NEXT_OUT2IN;
3015                 }
3016             }
3017
3018         enqueue0:
3019           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
3020                              (b0->flags & VLIB_BUFFER_IS_TRACED)))
3021             {
3022               nat44_ei_classify_trace_t *t =
3023                 vlib_add_trace (vm, node, b0, sizeof (*t));
3024               t->cached = 0;
3025               t->next_in2out = next0 == NAT44_EI_CLASSIFY_NEXT_IN2OUT ? 1 : 0;
3026             }
3027
3028           next_in2out += next0 == NAT44_EI_CLASSIFY_NEXT_IN2OUT;
3029           next_out2in += next0 == NAT44_EI_CLASSIFY_NEXT_OUT2IN;
3030
3031           /* verify speculative enqueue, maybe switch current next frame */
3032           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
3033                                            n_left_to_next, bi0, next0);
3034         }
3035
3036       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
3037     }
3038
3039   vlib_node_increment_counter (
3040     vm, node->node_index, NAT44_EI_CLASSIFY_ERROR_NEXT_IN2OUT, next_in2out);
3041   vlib_node_increment_counter (
3042     vm, node->node_index, NAT44_EI_CLASSIFY_ERROR_NEXT_OUT2IN, next_out2in);
3043   return frame->n_vectors;
3044 }
3045
3046 VLIB_NODE_FN (nat44_ei_classify_node)
3047 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
3048 {
3049   return nat44_ei_classify_inline_fn (vm, node, frame);
3050 }
3051
3052 VLIB_REGISTER_NODE (nat44_ei_classify_node) = {
3053   .name = "nat44-ei-classify",
3054   .vector_size = sizeof (u32),
3055   .format_trace = format_nat44_ei_classify_trace,
3056   .type = VLIB_NODE_TYPE_INTERNAL,
3057   .n_errors = ARRAY_LEN(nat44_ei_classify_error_strings),
3058   .error_strings = nat44_ei_classify_error_strings,
3059   .n_next_nodes = NAT44_EI_CLASSIFY_N_NEXT,
3060   .next_nodes = {
3061     [NAT44_EI_CLASSIFY_NEXT_IN2OUT] = "nat44-ei-in2out",
3062     [NAT44_EI_CLASSIFY_NEXT_OUT2IN] = "nat44-ei-out2in",
3063     [NAT44_EI_CLASSIFY_NEXT_DROP] = "error-drop",
3064   },
3065 };
3066
3067 VLIB_NODE_FN (nat44_ei_handoff_classify_node)
3068 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
3069 {
3070   return nat44_ei_classify_inline_fn (vm, node, frame);
3071 }
3072
3073 VLIB_REGISTER_NODE (nat44_ei_handoff_classify_node) = {
3074   .name = "nat44-ei-handoff-classify",
3075   .vector_size = sizeof (u32),
3076   .format_trace = format_nat44_ei_classify_trace,
3077   .type = VLIB_NODE_TYPE_INTERNAL,
3078   .n_errors = ARRAY_LEN(nat44_ei_classify_error_strings),
3079   .error_strings = nat44_ei_classify_error_strings,
3080   .n_next_nodes = NAT44_EI_CLASSIFY_N_NEXT,
3081   .next_nodes = {
3082     [NAT44_EI_CLASSIFY_NEXT_IN2OUT] = "nat44-ei-in2out-worker-handoff",
3083     [NAT44_EI_CLASSIFY_NEXT_OUT2IN] = "nat44-ei-out2in-worker-handoff",
3084     [NAT44_EI_CLASSIFY_NEXT_DROP] = "error-drop",
3085   },
3086 };
3087
3088 /*
3089  * fd.io coding-style-patch-verification: ON
3090  *
3091  * Local Variables:
3092  * eval: (c-set-style "gnu")
3093  * End:
3094  */