src/plugins/nat/in2out_ed.c

   1 /*
   2  * Copyright (c) 2018 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 /**
  16  * @file
  17  * @brief NAT44 endpoint-dependent inside to outside network translation
  18  */
  19
  20 #include <vlib/vlib.h>
  21 #include <vnet/vnet.h>
  22 #include <vnet/pg/pg.h>
  23 #include <vnet/ip/ip.h>
  24 #include <vnet/ethernet/ethernet.h>
  25 #include <vnet/fib/ip4_fib.h>
  26 #include <vnet/udp/udp.h>
  27 #include <vppinfra/error.h>
  28 #include <nat/nat.h>
  29 #include <nat/nat_ipfix_logging.h>
  30 #include <nat/nat_inlines.h>
  31 #include <nat/nat44_inlines.h>
  32 #include <nat/nat_syslog.h>
  33 #include <nat/nat_ha.h>
  34
  35 static char *nat_in2out_ed_error_strings[] = {
  36 #define _(sym,string) string,
  37   foreach_nat_in2out_ed_error
  38 #undef _
  39 };
  40
  41 typedef struct
  42 {
  43   u32 sw_if_index;
  44   u32 next_index;
  45   u32 session_index;
  46   u32 is_slow_path;
  47 } nat_in2out_ed_trace_t;
  48
  49 static u8 *
  50 format_nat_in2out_ed_trace (u8 * s, va_list * args)
  51 {
  52   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  53   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  54   nat_in2out_ed_trace_t *t = va_arg (*args, nat_in2out_ed_trace_t *);
  55   char *tag;
  56
  57   tag =
  58     t->is_slow_path ? "NAT44_IN2OUT_ED_SLOW_PATH" :
  59     "NAT44_IN2OUT_ED_FAST_PATH";
  60
  61   s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
  62               t->sw_if_index, t->next_index, t->session_index);
  63
  64   return s;
  65 }
  66
  67 #ifndef CLIB_MARCH_VARIANT
  68 int
  69 nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
  70 {
  71   snat_main_t *sm = &snat_main;
  72   nat44_is_idle_session_ctx_t *ctx = arg;
  73   snat_session_t *s;
  74   u64 sess_timeout_time;
  75   nat_ed_ses_key_t ed_key;
  76   clib_bihash_kv_16_8_t ed_kv;
  77   int i;
  78   snat_address_t *a;
  79   snat_session_key_t key;
  80   snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
  81                                                        ctx->thread_index);
  82
  83   s = pool_elt_at_index (tsm->sessions, kv->value);
  84   sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
  85   if (ctx->now >= sess_timeout_time)
  86     {
  87       if (is_fwd_bypass_session (s))
  88         goto delete;
  89
  90       ed_key.l_addr = s->out2in.addr;
  91       ed_key.r_addr = s->ext_host_addr;
  92       ed_key.fib_index = s->out2in.fib_index;
  93       if (snat_is_unk_proto_session (s))
  94         {
  95           ed_key.proto = s->in2out.port;
  96           ed_key.r_port = 0;
  97           ed_key.l_port = 0;
  98         }
  99       else
 100         {
 101           ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol);
 102           ed_key.l_port = s->out2in.port;
 103           ed_key.r_port = s->ext_host_port;
 104         }
 105       ed_kv.key[0] = ed_key.as_u64[0];
 106       ed_kv.key[1] = ed_key.as_u64[1];
 107       if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &ed_kv, 0))
 108         nat_elog_warn ("out2in_ed key del failed");
 109
 110       if (snat_is_unk_proto_session (s))
 111         goto delete;
 112
 113       snat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
 114                                            s->in2out.addr.as_u32,
 115                                            s->out2in.addr.as_u32,
 116                                            s->in2out.protocol,
 117                                            s->in2out.port,
 118                                            s->out2in.port,
 119                                            s->in2out.fib_index);
 120
 121       nat_syslog_nat44_sdel (s->user_index, s->in2out.fib_index,
 122                              &s->in2out.addr, s->in2out.port,
 123                              &s->ext_host_nat_addr, s->ext_host_nat_port,
 124                              &s->out2in.addr, s->out2in.port,
 125                              &s->ext_host_addr, s->ext_host_port,
 126                              s->in2out.protocol, is_twice_nat_session (s));
 127
 128       nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
 129                    s->ext_host_port, s->out2in.protocol, s->out2in.fib_index,
 130                    ctx->thread_index);
 131
 132       if (is_twice_nat_session (s))
 133         {
 134           for (i = 0; i < vec_len (sm->twice_nat_addresses); i++)
 135             {
 136               key.protocol = s->in2out.protocol;
 137               key.port = s->ext_host_nat_port;
 138               a = sm->twice_nat_addresses + i;
 139               if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
 140                 {
 141                   snat_free_outside_address_and_port (sm->twice_nat_addresses,
 142                                                       ctx->thread_index,
 143                                                       &key);
 144                   break;
 145                 }
 146             }
 147         }
 148
 149       if (snat_is_session_static (s))
 150         goto delete;
 151
 152       snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
 153                                           &s->out2in);
 154     delete:
 155       nat44_delete_session (sm, s, ctx->thread_index);
 156       return 1;
 157     }
 158
 159   return 0;
 160 }
 161 #endif
 162
 163 static inline u32
 164 icmp_in2out_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
 165                           ip4_header_t * ip0, icmp46_header_t * icmp0,
 166                           u32 sw_if_index0, u32 rx_fib_index0,
 167                           vlib_node_runtime_t * node, u32 next0, f64 now,
 168                           u32 thread_index, snat_session_t ** p_s0)
 169 {
 170   next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
 171                        next0, thread_index, p_s0, 0);
 172   snat_session_t *s0 = *p_s0;
 173   if (PREDICT_TRUE (next0 != NAT_NEXT_DROP && s0))
 174     {
 175       /* Accounting */
 176       nat44_session_update_counters (s0, now,
 177                                      vlib_buffer_length_in_chain
 178                                      (sm->vlib_main, b0), thread_index);
 179       /* Per-user LRU list maintenance */
 180       nat44_session_update_lru (sm, s0, thread_index);
 181     }
 182   return next0;
 183 }
 184
 185 static u32
 186 slow_path_ed (snat_main_t * sm,
 187               vlib_buffer_t * b,
 188               u32 rx_fib_index,
 189               clib_bihash_kv_16_8_t * kv,
 190               snat_session_t ** sessionp,
 191               vlib_node_runtime_t * node, u32 next, u32 thread_index, f64 now)
 192 {
 193   snat_session_t *s = 0;
 194   snat_user_t *u;
 195   snat_session_key_t key0, key1;
 196   lb_nat_type_t lb = 0, is_sm = 0;
 197   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 198   nat_ed_ses_key_t *key = (nat_ed_ses_key_t *) kv->key;
 199   u32 proto = ip_proto_to_snat_proto (key->proto);
 200   nat_outside_fib_t *outside_fib;
 201   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
 202   u8 identity_nat;
 203   fib_prefix_t pfx = {
 204     .fp_proto = FIB_PROTOCOL_IP4,
 205     .fp_len = 32,
 206     .fp_addr = {
 207                 .ip4.as_u32 = key->r_addr.as_u32,
 208                 },
 209   };
 210   nat44_is_idle_session_ctx_t ctx;
 211
 212   nat44_session_try_cleanup (&key->l_addr, rx_fib_index, thread_index, now);
 213
 214   if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
 215     {
 216       b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
 217       nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
 218       nat_elog_notice ("maximum sessions exceeded");
 219       return NAT_NEXT_DROP;
 220     }
 221
 222   key0.addr = key->l_addr;
 223   key0.port = key->l_port;
 224   key1.protocol = key0.protocol = proto;
 225   key0.fib_index = rx_fib_index;
 226   key1.fib_index = sm->outside_fib_index;
 227   /* First try to match static mapping by local address and port */
 228   if (snat_static_mapping_match
 229       (sm, key0, &key1, 0, 0, 0, &lb, 0, &identity_nat))
 230     {
 231       /* Try to create dynamic translation */
 232       if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index,
 233                                                thread_index, &key1,
 234                                                sm->port_per_thread,
 235                                                tsm->snat_thread_index))
 236         {
 237           nat_elog_notice ("addresses exhausted");
 238           b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS];
 239           return NAT_NEXT_DROP;
 240         }
 241     }
 242   else
 243     {
 244       if (PREDICT_FALSE (identity_nat))
 245         {
 246           *sessionp = s;
 247           return next;
 248         }
 249
 250       is_sm = 1;
 251     }
 252
 253   if (proto == SNAT_PROTOCOL_TCP)
 254     {
 255       if (!tcp_flags_is_init
 256           (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
 257         {
 258           b->error = node->errors[NAT_IN2OUT_ED_ERROR_NON_SYN];
 259           return NAT_NEXT_DROP;
 260         }
 261     }
 262
 263   u = nat_user_get_or_create (sm, &key->l_addr, rx_fib_index, thread_index);
 264   if (!u)
 265     {
 266       nat_elog_warn ("create NAT user failed");
 267       if (!is_sm)
 268         snat_free_outside_address_and_port (sm->addresses,
 269                                             thread_index, &key1);
 270       return NAT_NEXT_DROP;
 271     }
 272
 273   s = nat_ed_session_alloc (sm, u, thread_index, now);
 274   if (!s)
 275     {
 276       nat44_delete_user_with_no_session (sm, u, thread_index);
 277       nat_elog_warn ("create NAT session failed");
 278       if (!is_sm)
 279         snat_free_outside_address_and_port (sm->addresses,
 280                                             thread_index, &key1);
 281       return NAT_NEXT_DROP;
 282     }
 283
 284   user_session_increment (sm, u, is_sm);
 285   if (is_sm)
 286     s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
 287   if (lb)
 288     s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
 289   s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
 290   s->ext_host_addr = key->r_addr;
 291   s->ext_host_port = key->r_port;
 292   s->in2out = key0;
 293   s->out2in = key1;
 294   s->out2in.protocol = key0.protocol;
 295
 296   switch (vec_len (sm->outside_fibs))
 297     {
 298     case 0:
 299       s->out2in.fib_index = sm->outside_fib_index;
 300       break;
 301     case 1:
 302       s->out2in.fib_index = sm->outside_fibs[0].fib_index;
 303       break;
 304     default:
 305       /* *INDENT-OFF* */
 306       vec_foreach (outside_fib, sm->outside_fibs)
 307        {
 308           fei = fib_table_lookup (outside_fib->fib_index, &pfx);
 309           if (FIB_NODE_INDEX_INVALID != fei)
 310             {
 311               if (fib_entry_get_resolving_interface (fei) != ~0)
 312                 {
 313                   s->out2in.fib_index = outside_fib->fib_index;
 314                   break;
 315                 }
 316             }
 317         }
 318       /* *INDENT-ON* */
 319       break;
 320     }
 321
 322   /* Add to lookup tables */
 323   kv->value = s - tsm->sessions;
 324   ctx.now = now;
 325   ctx.thread_index = thread_index;
 326   if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, kv,
 327                                                nat44_i2o_ed_is_idle_session_cb,
 328                                                &ctx))
 329     nat_elog_notice ("in2out-ed key add failed");
 330
 331   make_ed_kv (kv, &key1.addr, &key->r_addr, key->proto, s->out2in.fib_index,
 332               key1.port, key->r_port);
 333   kv->value = s - tsm->sessions;
 334   if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, kv,
 335                                                nat44_o2i_ed_is_idle_session_cb,
 336                                                &ctx))
 337     nat_elog_notice ("out2in-ed key add failed");
 338
 339   *sessionp = s;
 340
 341   /* log NAT event */
 342   snat_ipfix_logging_nat44_ses_create (thread_index,
 343                                        s->in2out.addr.as_u32,
 344                                        s->out2in.addr.as_u32,
 345                                        s->in2out.protocol,
 346                                        s->in2out.port,
 347                                        s->out2in.port, s->in2out.fib_index);
 348
 349   nat_syslog_nat44_sadd (s->user_index, s->in2out.fib_index,
 350                          &s->in2out.addr, s->in2out.port,
 351                          &s->ext_host_nat_addr, s->ext_host_nat_port,
 352                          &s->out2in.addr, s->out2in.port,
 353                          &s->ext_host_addr, s->ext_host_port,
 354                          s->in2out.protocol, 0);
 355
 356   nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
 357                s->out2in.port, &s->ext_host_addr, s->ext_host_port,
 358                &s->ext_host_nat_addr, s->ext_host_nat_port,
 359                s->in2out.protocol, s->in2out.fib_index, s->flags,
 360                thread_index, 0);
 361
 362   return next;
 363 }
 364
 365 static_always_inline int
 366 nat44_ed_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
 367                         u32 sw_if_index, ip4_header_t * ip, u32 proto,
 368                         u32 rx_fib_index, u32 thread_index)
 369 {
 370   udp_header_t *udp = ip4_next_header (ip);
 371   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 372   clib_bihash_kv_16_8_t kv, value;
 373   snat_session_key_t key0, key1;
 374
 375   make_ed_kv (&kv, &ip->dst_address, &ip->src_address, ip->protocol,
 376               sm->outside_fib_index, udp->dst_port, udp->src_port);
 377
 378   /* NAT packet aimed at external address if */
 379   /* has active sessions */
 380   if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
 381     {
 382       key0.addr = ip->dst_address;
 383       key0.port = udp->dst_port;
 384       key0.protocol = proto;
 385       key0.fib_index = sm->outside_fib_index;
 386       /* or is static mappings */
 387       if (!snat_static_mapping_match (sm, key0, &key1, 1, 0, 0, 0, 0, 0))
 388         return 0;
 389     }
 390   else
 391     return 0;
 392
 393   if (sm->forwarding_enabled)
 394     return 1;
 395
 396   return snat_not_translate_fast (sm, node, sw_if_index, ip, proto,
 397                                   rx_fib_index);
 398 }
 399
 400 static_always_inline int
 401 nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip,
 402                                       u32 thread_index, f64 now,
 403                                       vlib_main_t * vm, vlib_buffer_t * b)
 404 {
 405   nat_ed_ses_key_t key;
 406   clib_bihash_kv_16_8_t kv, value;
 407   snat_session_t *s = 0;
 408   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 409
 410   if (!sm->forwarding_enabled)
 411     return 0;
 412
 413   if (ip->protocol == IP_PROTOCOL_ICMP)
 414     {
 415       key.as_u64[0] = key.as_u64[1] = 0;
 416       if (get_icmp_i2o_ed_key (b, ip, &key))
 417         return 0;
 418       key.fib_index = 0;
 419       kv.key[0] = key.as_u64[0];
 420       kv.key[1] = key.as_u64[1];
 421     }
 422   else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
 423     {
 424       make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0,
 425                   vnet_buffer (b)->ip.reass.l4_src_port,
 426                   vnet_buffer (b)->ip.reass.l4_dst_port);
 427     }
 428   else
 429     {
 430       make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0, 0,
 431                   0);
 432     }
 433
 434   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 435     {
 436       s = pool_elt_at_index (tsm->sessions, value.value);
 437       if (is_fwd_bypass_session (s))
 438         {
 439           if (ip->protocol == IP_PROTOCOL_TCP)
 440             {
 441               if (nat44_set_tcp_session_state_i2o (sm, s, b, thread_index))
 442                 return 1;
 443             }
 444           /* Accounting */
 445           nat44_session_update_counters (s, now,
 446                                          vlib_buffer_length_in_chain (vm, b),
 447                                          thread_index);
 448           /* Per-user LRU list maintenance */
 449           nat44_session_update_lru (sm, s, thread_index);
 450           return 1;
 451         }
 452       else
 453         return 0;
 454     }
 455
 456   return 0;
 457 }
 458
 459 static_always_inline int
 460 nat44_ed_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip,
 461                                        u8 proto, u16 src_port, u16 dst_port,
 462                                        u32 thread_index, u32 rx_sw_if_index,
 463                                        u32 tx_sw_if_index)
 464 {
 465   clib_bihash_kv_16_8_t kv, value;
 466   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 467   snat_interface_t *i;
 468   snat_session_t *s;
 469   u32 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (rx_sw_if_index);
 470   u32 tx_fib_index = ip4_fib_table_get_index_for_sw_if_index (tx_sw_if_index);
 471
 472   /* src NAT check */
 473   make_ed_kv (&kv, &ip->src_address, &ip->dst_address, proto, tx_fib_index,
 474               src_port, dst_port);
 475   if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
 476     {
 477       s = pool_elt_at_index (tsm->sessions, value.value);
 478       if (nat44_is_ses_closed (s))
 479         {
 480           nat_free_session_data (sm, s, thread_index, 0);
 481           nat44_delete_session (sm, s, thread_index);
 482         }
 483       else
 484         s->flags |= SNAT_SESSION_FLAG_OUTPUT_FEATURE;
 485       return 1;
 486     }
 487
 488   /* dst NAT check */
 489   make_ed_kv (&kv, &ip->dst_address, &ip->src_address, proto, rx_fib_index,
 490               dst_port, src_port);
 491   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 492     {
 493       s = pool_elt_at_index (tsm->sessions, value.value);
 494       if (is_fwd_bypass_session (s))
 495         return 0;
 496
 497       /* hairpinning */
 498       /* *INDENT-OFF* */
 499       pool_foreach (i, sm->output_feature_interfaces,
 500       ({
 501         if ((nat_interface_is_inside (i)) && (rx_sw_if_index == i->sw_if_index))
 502            return 0;
 503       }));
 504       /* *INDENT-ON* */
 505       return 1;
 506     }
 507
 508   return 0;
 509 }
 510
 511 #ifndef CLIB_MARCH_VARIANT
 512 u32
 513 icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node,
 514                       u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip,
 515                       u8 * p_proto, snat_session_key_t * p_value,
 516                       u8 * p_dont_translate, void *d, void *e)
 517 {
 518   u32 sw_if_index;
 519   u32 rx_fib_index;
 520   nat_ed_ses_key_t key;
 521   snat_session_t *s = 0;
 522   u8 dont_translate = 0;
 523   clib_bihash_kv_16_8_t kv, value;
 524   u32 next = ~0;
 525   int err;
 526   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 527
 528   sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
 529   rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
 530
 531   key.as_u64[0] = key.as_u64[1] = 0;
 532   err = get_icmp_i2o_ed_key (b, ip, &key);
 533   if (err != 0)
 534     {
 535       b->error = node->errors[err];
 536       next = NAT_NEXT_DROP;
 537       goto out;
 538     }
 539   key.fib_index = rx_fib_index;
 540
 541   kv.key[0] = key.as_u64[0];
 542   kv.key[1] = key.as_u64[1];
 543
 544   if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 545     {
 546       if (vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0)
 547         {
 548           if (PREDICT_FALSE
 549               (nat44_ed_not_translate_output_feature
 550                (sm, ip, key.proto, key.l_port, key.r_port, thread_index,
 551                 sw_if_index, vnet_buffer (b)->sw_if_index[VLIB_TX])))
 552             {
 553               dont_translate = 1;
 554               goto out;
 555             }
 556         }
 557       else
 558         {
 559           if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index,
 560                                                      ip, SNAT_PROTOCOL_ICMP,
 561                                                      rx_fib_index,
 562                                                      thread_index)))
 563             {
 564               dont_translate = 1;
 565               goto out;
 566             }
 567         }
 568
 569       if (PREDICT_FALSE
 570           (icmp_type_is_error_message
 571            (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)))
 572         {
 573           b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
 574           next = NAT_NEXT_DROP;
 575           goto out;
 576         }
 577
 578       next = slow_path_ed (sm, b, rx_fib_index, &kv, &s, node, next,
 579                            thread_index, vlib_time_now (sm->vlib_main));
 580
 581       if (PREDICT_FALSE (next == NAT_NEXT_DROP))
 582         goto out;
 583
 584       if (!s)
 585         {
 586           dont_translate = 1;
 587           goto out;
 588         }
 589     }
 590   else
 591     {
 592       if (PREDICT_FALSE
 593           (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
 594            ICMP4_echo_request
 595            && vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
 596            ICMP4_echo_reply
 597            && !icmp_type_is_error_message (vnet_buffer (b)->ip.
 598                                            reass.icmp_type_or_tcp_flags)))
 599         {
 600           b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
 601           next = NAT_NEXT_DROP;
 602           goto out;
 603         }
 604
 605       s = pool_elt_at_index (tsm->sessions, value.value);
 606     }
 607
 608   *p_proto = ip_proto_to_snat_proto (key.proto);
 609 out:
 610   if (s)
 611     *p_value = s->out2in;
 612   *p_dont_translate = dont_translate;
 613   if (d)
 614     *(snat_session_t **) d = s;
 615   return next;
 616 }
 617 #endif
 618
 619 static snat_session_t *
 620 nat44_ed_in2out_unknown_proto (snat_main_t * sm,
 621                                vlib_buffer_t * b,
 622                                ip4_header_t * ip,
 623                                u32 rx_fib_index,
 624                                u32 thread_index,
 625                                f64 now,
 626                                vlib_main_t * vm, vlib_node_runtime_t * node)
 627 {
 628   clib_bihash_kv_8_8_t kv, value;
 629   clib_bihash_kv_16_8_t s_kv, s_value;
 630   snat_static_mapping_t *m;
 631   u32 old_addr, new_addr = 0;
 632   ip_csum_t sum;
 633   snat_user_t *u;
 634   dlist_elt_t *head, *elt;
 635   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 636   u32 elt_index, head_index, ses_index;
 637   snat_session_t *s;
 638   u32 outside_fib_index = sm->outside_fib_index;
 639   int i;
 640   u8 is_sm = 0;
 641   nat_outside_fib_t *outside_fib;
 642   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
 643   fib_prefix_t pfx = {
 644     .fp_proto = FIB_PROTOCOL_IP4,
 645     .fp_len = 32,
 646     .fp_addr = {
 647                 .ip4.as_u32 = ip->dst_address.as_u32,
 648                 },
 649   };
 650
 651   switch (vec_len (sm->outside_fibs))
 652     {
 653     case 0:
 654       outside_fib_index = sm->outside_fib_index;
 655       break;
 656     case 1:
 657       outside_fib_index = sm->outside_fibs[0].fib_index;
 658       break;
 659     default:
 660       /* *INDENT-OFF* */
 661       vec_foreach (outside_fib, sm->outside_fibs)
 662         {
 663           fei = fib_table_lookup (outside_fib->fib_index, &pfx);
 664           if (FIB_NODE_INDEX_INVALID != fei)
 665             {
 666               if (fib_entry_get_resolving_interface (fei) != ~0)
 667                 {
 668                   outside_fib_index = outside_fib->fib_index;
 669                   break;
 670                 }
 671             }
 672         }
 673       /* *INDENT-ON* */
 674       break;
 675     }
 676   old_addr = ip->src_address.as_u32;
 677
 678   make_ed_kv (&s_kv, &ip->src_address, &ip->dst_address, ip->protocol,
 679               rx_fib_index, 0, 0);
 680
 681   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &s_kv, &s_value))
 682     {
 683       s = pool_elt_at_index (tsm->sessions, s_value.value);
 684       new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
 685     }
 686   else
 687     {
 688       if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
 689         {
 690           b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
 691           nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
 692           nat_elog_notice ("maximum sessions exceeded");
 693           return 0;
 694         }
 695
 696       u = nat_user_get_or_create (sm, &ip->src_address, rx_fib_index,
 697                                   thread_index);
 698       if (!u)
 699         {
 700           nat_elog_warn ("create NAT user failed");
 701           return 0;
 702         }
 703
 704       make_sm_kv (&kv, &ip->src_address, 0, rx_fib_index, 0);
 705
 706       /* Try to find static mapping first */
 707       if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
 708         {
 709           m = pool_elt_at_index (sm->static_mappings, value.value);
 710           new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
 711           is_sm = 1;
 712           goto create_ses;
 713         }
 714       /* Fallback to 3-tuple key */
 715       else
 716         {
 717           /* Choose same out address as for TCP/UDP session to same destination */
 718           head_index = u->sessions_per_user_list_head_index;
 719           head = pool_elt_at_index (tsm->list_pool, head_index);
 720           elt_index = head->next;
 721           if (PREDICT_FALSE (elt_index == ~0))
 722             ses_index = ~0;
 723           else
 724             {
 725               elt = pool_elt_at_index (tsm->list_pool, elt_index);
 726               ses_index = elt->value;
 727             }
 728
 729           while (ses_index != ~0)
 730             {
 731               s = pool_elt_at_index (tsm->sessions, ses_index);
 732               elt_index = elt->next;
 733               elt = pool_elt_at_index (tsm->list_pool, elt_index);
 734               ses_index = elt->value;
 735
 736               if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
 737                 {
 738                   new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
 739
 740                   make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address,
 741                               ip->protocol, outside_fib_index, 0, 0);
 742                   if (clib_bihash_search_16_8
 743                       (&tsm->out2in_ed, &s_kv, &s_value))
 744                     goto create_ses;
 745
 746                   break;
 747                 }
 748             }
 749
 750           for (i = 0; i < vec_len (sm->addresses); i++)
 751             {
 752               make_ed_kv (&s_kv, &sm->addresses[i].addr, &ip->dst_address,
 753                           ip->protocol, outside_fib_index, 0, 0);
 754               if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
 755                 {
 756                   new_addr = ip->src_address.as_u32 =
 757                     sm->addresses[i].addr.as_u32;
 758                   goto create_ses;
 759                 }
 760             }
 761           return 0;
 762         }
 763
 764     create_ses:
 765       s = nat_ed_session_alloc (sm, u, thread_index, now);
 766       if (!s)
 767         {
 768           nat44_delete_user_with_no_session (sm, u, thread_index);
 769           nat_elog_warn ("create NAT session failed");
 770           return 0;
 771         }
 772
 773       s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
 774       s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
 775       s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
 776       s->out2in.addr.as_u32 = new_addr;
 777       s->out2in.fib_index = outside_fib_index;
 778       s->in2out.addr.as_u32 = old_addr;
 779       s->in2out.fib_index = rx_fib_index;
 780       s->in2out.port = s->out2in.port = ip->protocol;
 781       if (is_sm)
 782         s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
 783       user_session_increment (sm, u, is_sm);
 784
 785       /* Add to lookup tables */
 786       make_ed_kv (&s_kv, &s->in2out.addr, &ip->dst_address, ip->protocol,
 787                   rx_fib_index, 0, 0);
 788       s_kv.value = s - tsm->sessions;
 789       if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1))
 790         nat_elog_notice ("in2out key add failed");
 791
 792       make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address, ip->protocol,
 793                   outside_fib_index, 0, 0);
 794       s_kv.value = s - tsm->sessions;
 795       if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1))
 796         nat_elog_notice ("out2in key add failed");
 797     }
 798
 799   /* Update IP checksum */
 800   sum = ip->checksum;
 801   sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
 802   ip->checksum = ip_csum_fold (sum);
 803
 804   /* Accounting */
 805   nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b),
 806                                  thread_index);
 807   /* Per-user LRU list maintenance */
 808   nat44_session_update_lru (sm, s, thread_index);
 809
 810   /* Hairpinning */
 811   if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
 812     nat44_ed_hairpinning_unknown_proto (sm, b, ip);
 813
 814   if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
 815     vnet_buffer (b)->sw_if_index[VLIB_TX] = outside_fib_index;
 816
 817   return s;
 818 }
 819
 820 static inline uword
 821 nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
 822                                 vlib_node_runtime_t * node,
 823                                 vlib_frame_t * frame, int is_slow_path,
 824                                 int is_output_feature)
 825 {
 826   u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
 827   nat_next_t next_index;
 828   snat_main_t *sm = &snat_main;
 829   f64 now = vlib_time_now (vm);
 830   u32 thread_index = vm->thread_index;
 831   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 832   u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
 833     0, def_slow;
 834
 835   def_slow = is_output_feature ? NAT_NEXT_IN2OUT_ED_OUTPUT_SLOW_PATH :
 836     NAT_NEXT_IN2OUT_ED_SLOW_PATH;
 837
 838   stats_node_index = is_slow_path ? sm->ed_in2out_slowpath_node_index :
 839     sm->ed_in2out_node_index;
 840
 841   from = vlib_frame_vector_args (frame);
 842   n_left_from = frame->n_vectors;
 843   next_index = node->cached_next_index;
 844
 845   while (n_left_from > 0)
 846     {
 847       u32 n_left_to_next;
 848
 849       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 850
 851       while (n_left_from >= 4 && n_left_to_next >= 2)
 852         {
 853           u32 bi0, bi1;
 854           vlib_buffer_t *b0, *b1;
 855           u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
 856             new_addr0, old_addr0;
 857           u32 next1, sw_if_index1, rx_fib_index1, iph_offset1 = 0, proto1,
 858             new_addr1, old_addr1;
 859           u16 old_port0, new_port0, old_port1, new_port1;
 860           ip4_header_t *ip0, *ip1;
 861           udp_header_t *udp0, *udp1;
 862           tcp_header_t *tcp0, *tcp1;
 863           icmp46_header_t *icmp0, *icmp1;
 864           snat_session_t *s0 = 0, *s1 = 0;
 865           clib_bihash_kv_16_8_t kv0, value0, kv1, value1;
 866           ip_csum_t sum0, sum1;
 867
 868           /* Prefetch next iteration. */
 869           {
 870             vlib_buffer_t *p2, *p3;
 871
 872             p2 = vlib_get_buffer (vm, from[2]);
 873             p3 = vlib_get_buffer (vm, from[3]);
 874
 875             vlib_prefetch_buffer_header (p2, LOAD);
 876             vlib_prefetch_buffer_header (p3, LOAD);
 877
 878             CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
 879             CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
 880           }
 881
 882           /* speculatively enqueue b0 and b1 to the current next frame */
 883           to_next[0] = bi0 = from[0];
 884           to_next[1] = bi1 = from[1];
 885           from += 2;
 886           to_next += 2;
 887           n_left_from -= 2;
 888           n_left_to_next -= 2;
 889
 890           b0 = vlib_get_buffer (vm, bi0);
 891           b1 = vlib_get_buffer (vm, bi1);
 892
 893           if (is_output_feature)
 894             {
 895               // output feature fast path is enabled on the arc
 896               // we need new arc_next feature
 897               if (PREDICT_TRUE (!is_slow_path))
 898                 {
 899                   vnet_feature_next (&nat_buffer_opaque (b0)->arc_next, b0);
 900                   vnet_feature_next (&nat_buffer_opaque (b1)->arc_next, b1);
 901                 }
 902
 903               iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
 904               iph_offset1 = vnet_buffer (b1)->ip.reass.save_rewrite_length;
 905             }
 906
 907           next0 = nat_buffer_opaque (b0)->arc_next;
 908           next1 = nat_buffer_opaque (b1)->arc_next;
 909
 910           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
 911                                   iph_offset0);
 912
 913           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 914           rx_fib_index0 =
 915             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
 916                                                  sw_if_index0);
 917
 918           if (PREDICT_FALSE (ip0->ttl == 1))
 919             {
 920               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 921               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
 922                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
 923                                            0);
 924               next0 = NAT_NEXT_ICMP_ERROR;
 925               goto trace00;
 926             }
 927
 928           udp0 = ip4_next_header (ip0);
 929           tcp0 = (tcp_header_t *) udp0;
 930           icmp0 = (icmp46_header_t *) udp0;
 931           proto0 = ip_proto_to_snat_proto (ip0->protocol);
 932
 933           if (is_slow_path)
 934             {
 935               if (PREDICT_FALSE (proto0 == ~0))
 936                 {
 937                   s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
 938                                                       rx_fib_index0,
 939                                                       thread_index, now, vm,
 940                                                       node);
 941                   if (!s0)
 942                     next0 = NAT_NEXT_DROP;
 943                   other_packets++;
 944                   goto trace00;
 945                 }
 946
 947               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
 948                 {
 949                   next0 = icmp_in2out_ed_slow_path
 950                     (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
 951                      next0, now, thread_index, &s0);
 952                   icmp_packets++;
 953                   goto trace00;
 954                 }
 955             }
 956           else
 957             {
 958               if (PREDICT_FALSE (proto0 == ~0))
 959                 {
 960                   next0 = def_slow;
 961                   goto trace00;
 962                 }
 963
 964               if (is_output_feature)
 965                 {
 966                   if (PREDICT_FALSE
 967                       (nat_not_translate_output_feature_fwd
 968                        (sm, ip0, thread_index, now, vm, b0)))
 969                     goto trace00;
 970                 }
 971
 972               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
 973                 {
 974                   next0 = def_slow;
 975                   goto trace00;
 976                 }
 977             }
 978
 979           make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
 980                       ip0->protocol, rx_fib_index0,
 981                       vnet_buffer (b0)->ip.reass.l4_src_port,
 982                       vnet_buffer (b0)->ip.reass.l4_dst_port);
 983
 984           if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
 985             {
 986               if (is_slow_path)
 987                 {
 988                   if (is_output_feature)
 989                     {
 990                       if (PREDICT_FALSE
 991                           (nat44_ed_not_translate_output_feature
 992                            (sm, ip0, ip0->protocol,
 993                             vnet_buffer (b0)->ip.reass.l4_src_port,
 994                             vnet_buffer (b0)->ip.reass.l4_dst_port,
 995                             thread_index, sw_if_index0,
 996                             vnet_buffer (b0)->sw_if_index[VLIB_TX])))
 997                         goto trace00;
 998
 999                       /*
1000                        * Send DHCP packets to the ipv4 stack, or we won't
1001                        * be able to use dhcp client on the outside interface
1002                        */
1003                       if (PREDICT_FALSE
1004                           ((b0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)
1005                            && proto0 == SNAT_PROTOCOL_UDP
1006                            && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
1007                                clib_host_to_net_u16
1008                                (UDP_DST_PORT_dhcp_to_server))))
1009                         goto trace00;
1010                     }
1011                   else
1012                     {
1013                       if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1014                                                                  sw_if_index0,
1015                                                                  ip0, proto0,
1016                                                                  rx_fib_index0,
1017                                                                  thread_index)))
1018                         goto trace00;
1019                     }
1020
1021                   next0 =
1022                     slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1023                                   next0, thread_index, now);
1024
1025                   if (PREDICT_FALSE (next0 == NAT_NEXT_DROP))
1026                     goto trace00;
1027
1028                   if (PREDICT_FALSE (!s0))
1029                     goto trace00;
1030                 }
1031               else
1032                 {
1033                   next0 = def_slow;
1034                   goto trace00;
1035                 }
1036             }
1037           else
1038             {
1039               s0 = pool_elt_at_index (tsm->sessions, value0.value);
1040             }
1041
1042           b0->flags |= VNET_BUFFER_F_IS_NATED;
1043
1044           if (!is_output_feature)
1045             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1046
1047           old_addr0 = ip0->src_address.as_u32;
1048           new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1049           sum0 = ip0->checksum;
1050           sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1051                                  src_address);
1052           if (PREDICT_FALSE (is_twice_nat_session (s0)))
1053             sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1054                                    s0->ext_host_addr.as_u32, ip4_header_t,
1055                                    dst_address);
1056           ip0->checksum = ip_csum_fold (sum0);
1057
1058           old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1059
1060           if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1061             {
1062               if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1063                 {
1064                   new_port0 = udp0->src_port = s0->out2in.port;
1065                   sum0 = tcp0->checksum;
1066                   sum0 =
1067                     ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1068                                     dst_address);
1069                   sum0 =
1070                     ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1071                                     length);
1072                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1073                     {
1074                       sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1075                                              s0->ext_host_addr.as_u32,
1076                                              ip4_header_t, dst_address);
1077                       sum0 =
1078                         ip_csum_update (sum0,
1079                                         vnet_buffer (b0)->ip.
1080                                         reass.l4_dst_port, s0->ext_host_port,
1081                                         ip4_header_t, length);
1082                       tcp0->dst_port = s0->ext_host_port;
1083                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1084                     }
1085                   mss_clamping (sm, tcp0, &sum0);
1086                   tcp0->checksum = ip_csum_fold (sum0);
1087                 }
1088               tcp_packets++;
1089               if (nat44_set_tcp_session_state_i2o (sm, s0, b0, thread_index))
1090                 goto trace00;
1091             }
1092           else if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment
1093                    && udp0->checksum)
1094             {
1095               new_port0 = udp0->src_port = s0->out2in.port;
1096               sum0 = udp0->checksum;
1097               sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1098                                      dst_address);
1099               sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1100                                      length);
1101               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1102                 {
1103                   sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1104                                          s0->ext_host_addr.as_u32,
1105                                          ip4_header_t, dst_address);
1106                   sum0 =
1107                     ip_csum_update (sum0,
1108                                     vnet_buffer (b0)->ip.reass.l4_dst_port,
1109                                     s0->ext_host_port, ip4_header_t, length);
1110                   udp0->dst_port = s0->ext_host_port;
1111                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1112                 }
1113               udp0->checksum = ip_csum_fold (sum0);
1114               udp_packets++;
1115             }
1116           else
1117             {
1118               if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1119                 {
1120                   new_port0 = udp0->src_port = s0->out2in.port;
1121                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1122                     {
1123                       udp0->dst_port = s0->ext_host_port;
1124                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1125                     }
1126                   udp_packets++;
1127                 }
1128             }
1129
1130           /* Accounting */
1131           nat44_session_update_counters (s0, now,
1132                                          vlib_buffer_length_in_chain (vm,
1133                                                                       b0),
1134                                          thread_index);
1135           /* Per-user LRU list maintenance */
1136           nat44_session_update_lru (sm, s0, thread_index);
1137
1138         trace00:
1139           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1140                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1141             {
1142               nat_in2out_ed_trace_t *t =
1143                 vlib_add_trace (vm, node, b0, sizeof (*t));
1144               t->is_slow_path = is_slow_path;
1145               t->sw_if_index = sw_if_index0;
1146               t->next_index = next0;
1147               t->session_index = ~0;
1148               if (s0)
1149                 t->session_index = s0 - tsm->sessions;
1150             }
1151
1152           pkts_processed += next0 == nat_buffer_opaque (b0)->arc_next;
1153
1154           ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
1155                                   iph_offset1);
1156
1157           sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
1158           rx_fib_index1 =
1159             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1160                                                  sw_if_index1);
1161
1162           if (PREDICT_FALSE (ip1->ttl == 1))
1163             {
1164               vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1165               icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
1166                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
1167                                            0);
1168               next1 = NAT_NEXT_ICMP_ERROR;
1169               goto trace01;
1170             }
1171
1172           udp1 = ip4_next_header (ip1);
1173           tcp1 = (tcp_header_t *) udp1;
1174           icmp1 = (icmp46_header_t *) udp1;
1175           proto1 = ip_proto_to_snat_proto (ip1->protocol);
1176
1177           if (is_slow_path)
1178             {
1179               if (PREDICT_FALSE (proto1 == ~0))
1180                 {
1181                   s1 = nat44_ed_in2out_unknown_proto (sm, b1, ip1,
1182                                                       rx_fib_index1,
1183                                                       thread_index, now,
1184                                                       vm, node);
1185                   if (!s1)
1186                     next1 = NAT_NEXT_DROP;
1187                   other_packets++;
1188                   goto trace01;
1189                 }
1190
1191               if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1192                 {
1193                   next1 = icmp_in2out_ed_slow_path
1194                     (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1,
1195                      node, next1, now, thread_index, &s1);
1196                   icmp_packets++;
1197                   goto trace01;
1198                 }
1199             }
1200           else
1201             {
1202               if (PREDICT_FALSE (proto1 == ~0))
1203                 {
1204                   next1 = def_slow;
1205                   goto trace01;
1206                 }
1207
1208               if (is_output_feature)
1209                 {
1210                   if (PREDICT_FALSE
1211                       (nat_not_translate_output_feature_fwd
1212                        (sm, ip1, thread_index, now, vm, b1)))
1213                     goto trace01;
1214                 }
1215
1216               if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1217                 {
1218                   next1 = def_slow;
1219                   goto trace01;
1220                 }
1221             }
1222
1223           make_ed_kv (&kv1, &ip1->src_address, &ip1->dst_address,
1224                       ip1->protocol, rx_fib_index1,
1225                       vnet_buffer (b1)->ip.reass.l4_src_port,
1226                       vnet_buffer (b1)->ip.reass.l4_dst_port);
1227
1228           if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv1, &value1))
1229             {
1230               if (is_slow_path)
1231                 {
1232                   if (is_output_feature)
1233                     {
1234                       if (PREDICT_FALSE
1235                           (nat44_ed_not_translate_output_feature
1236                            (sm, ip1, ip1->protocol,
1237                             vnet_buffer (b1)->ip.reass.l4_src_port,
1238                             vnet_buffer (b1)->ip.reass.l4_dst_port,
1239                             thread_index, sw_if_index1,
1240                             vnet_buffer (b1)->sw_if_index[VLIB_TX])))
1241                         goto trace01;
1242
1243                       /*
1244                        * Send DHCP packets to the ipv4 stack, or we won't
1245                        * be able to use dhcp client on the outside interface
1246                        */
1247                       if (PREDICT_FALSE
1248                           ((b1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)
1249                            && proto1 == SNAT_PROTOCOL_UDP
1250                            && (vnet_buffer (b1)->ip.reass.l4_dst_port ==
1251                                clib_host_to_net_u16
1252                                (UDP_DST_PORT_dhcp_to_server))))
1253                         goto trace01;
1254                     }
1255                   else
1256                     {
1257                       if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1258                                                                  sw_if_index1,
1259                                                                  ip1,
1260                                                                  proto1,
1261                                                                  rx_fib_index1,
1262                                                                  thread_index)))
1263                         goto trace01;
1264                     }
1265
1266                   next1 =
1267                     slow_path_ed (sm, b1, rx_fib_index1, &kv1, &s1, node,
1268                                   next1, thread_index, now);
1269
1270                   if (PREDICT_FALSE (next1 == NAT_NEXT_DROP))
1271                     goto trace01;
1272
1273                   if (PREDICT_FALSE (!s1))
1274                     goto trace01;
1275                 }
1276               else
1277                 {
1278                   next1 = def_slow;
1279                   goto trace01;
1280                 }
1281             }
1282           else
1283             {
1284               s1 = pool_elt_at_index (tsm->sessions, value1.value);
1285             }
1286
1287           b1->flags |= VNET_BUFFER_F_IS_NATED;
1288
1289           if (!is_output_feature)
1290             vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
1291
1292           old_addr1 = ip1->src_address.as_u32;
1293           new_addr1 = ip1->src_address.as_u32 = s1->out2in.addr.as_u32;
1294           sum1 = ip1->checksum;
1295           sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1296                                  src_address);
1297           if (PREDICT_FALSE (is_twice_nat_session (s1)))
1298             sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1299                                    s1->ext_host_addr.as_u32, ip4_header_t,
1300                                    dst_address);
1301           ip1->checksum = ip_csum_fold (sum1);
1302
1303           old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port;
1304
1305           if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1306             {
1307               if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1308                 {
1309                   new_port1 = udp1->src_port = s1->out2in.port;
1310                   sum1 = tcp1->checksum;
1311                   sum1 =
1312                     ip_csum_update (sum1, old_addr1, new_addr1,
1313                                     ip4_header_t, dst_address);
1314                   sum1 =
1315                     ip_csum_update (sum1, old_port1, new_port1,
1316                                     ip4_header_t, length);
1317                   if (PREDICT_FALSE (is_twice_nat_session (s1)))
1318                     {
1319                       sum1 =
1320                         ip_csum_update (sum1, ip1->dst_address.as_u32,
1321                                         s1->ext_host_addr.as_u32,
1322                                         ip4_header_t, dst_address);
1323                       sum1 =
1324                         ip_csum_update (sum1,
1325                                         vnet_buffer (b1)->ip.
1326                                         reass.l4_dst_port, s1->ext_host_port,
1327                                         ip4_header_t, length);
1328                       tcp1->dst_port = s1->ext_host_port;
1329                       ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1330                     }
1331                   tcp1->checksum = ip_csum_fold (sum1);
1332                   mss_clamping (sm, tcp1, &sum1);
1333                 }
1334               tcp_packets++;
1335               if (nat44_set_tcp_session_state_i2o (sm, s1, b1, thread_index))
1336                 goto trace01;
1337             }
1338           else if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment
1339                    && udp1->checksum)
1340             {
1341               new_port1 = udp1->src_port = s1->out2in.port;
1342               sum1 = udp1->checksum;
1343               sum1 =
1344                 ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1345                                 dst_address);
1346               sum1 =
1347                 ip_csum_update (sum1, old_port1, new_port1, ip4_header_t,
1348                                 length);
1349
1350               if (PREDICT_FALSE (is_twice_nat_session (s1)))
1351                 {
1352                   sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1353                                          s1->ext_host_addr.as_u32,
1354                                          ip4_header_t, dst_address);
1355                   sum1 =
1356                     ip_csum_update (sum1,
1357                                     vnet_buffer (b1)->ip.reass.l4_dst_port,
1358                                     s1->ext_host_port, ip4_header_t, length);
1359                   udp1->dst_port = s1->ext_host_port;
1360                   ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1361                 }
1362               udp1->checksum = ip_csum_fold (sum1);
1363               udp_packets++;
1364             }
1365           else
1366             {
1367               if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment)
1368                 {
1369                   new_port1 = udp1->src_port = s1->out2in.port;
1370                   if (PREDICT_FALSE (is_twice_nat_session (s1)))
1371                     {
1372                       udp1->dst_port = s1->ext_host_port;
1373                       ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1374                     }
1375                 }
1376               udp_packets++;
1377             }
1378
1379           /* Accounting */
1380           nat44_session_update_counters (s1, now,
1381                                          vlib_buffer_length_in_chain (vm,
1382                                                                       b1),
1383                                          thread_index);
1384           /* Per-user LRU list maintenance */
1385           nat44_session_update_lru (sm, s1, thread_index);
1386
1387         trace01:
1388           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1389                              && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1390             {
1391               nat_in2out_ed_trace_t *t =
1392                 vlib_add_trace (vm, node, b1, sizeof (*t));
1393               t->is_slow_path = is_slow_path;
1394               t->sw_if_index = sw_if_index1;
1395               t->next_index = next1;
1396               t->session_index = ~0;
1397               if (s1)
1398                 t->session_index = s1 - tsm->sessions;
1399             }
1400
1401           pkts_processed += next1 == nat_buffer_opaque (b1)->arc_next;
1402
1403
1404           /* verify speculative enqueues, maybe switch current next frame */
1405           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1406                                            to_next, n_left_to_next,
1407                                            bi0, bi1, next0, next1);
1408         }
1409
1410       while (n_left_from > 0 && n_left_to_next > 0)
1411         {
1412           u32 bi0;
1413           vlib_buffer_t *b0;
1414           u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
1415             new_addr0, old_addr0;
1416           u16 old_port0, new_port0;
1417           ip4_header_t *ip0;
1418           udp_header_t *udp0;
1419           tcp_header_t *tcp0;
1420           icmp46_header_t *icmp0;
1421           snat_session_t *s0 = 0;
1422           clib_bihash_kv_16_8_t kv0, value0;
1423           ip_csum_t sum0;
1424
1425           /* speculatively enqueue b0 to the current next frame */
1426           bi0 = from[0];
1427           to_next[0] = bi0;
1428           from += 1;
1429           to_next += 1;
1430           n_left_from -= 1;
1431           n_left_to_next -= 1;
1432
1433           b0 = vlib_get_buffer (vm, bi0);
1434
1435           if (is_output_feature)
1436             {
1437               // output feature fast path is enabled on the arc
1438               // we need new arc_next feature
1439               if (PREDICT_TRUE (!is_slow_path))
1440                 vnet_feature_next (&nat_buffer_opaque (b0)->arc_next, b0);
1441
1442               iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
1443             }
1444
1445           next0 = nat_buffer_opaque (b0)->arc_next;
1446
1447           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1448                                   iph_offset0);
1449
1450           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1451           rx_fib_index0 =
1452             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1453                                                  sw_if_index0);
1454
1455           if (PREDICT_FALSE (ip0->ttl == 1))
1456             {
1457               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1458               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1459                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
1460                                            0);
1461               next0 = NAT_NEXT_ICMP_ERROR;
1462               goto trace0;
1463             }
1464
1465           udp0 = ip4_next_header (ip0);
1466           tcp0 = (tcp_header_t *) udp0;
1467           icmp0 = (icmp46_header_t *) udp0;
1468           proto0 = ip_proto_to_snat_proto (ip0->protocol);
1469
1470           if (is_slow_path)
1471             {
1472               if (PREDICT_FALSE (proto0 == ~0))
1473                 {
1474                   s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
1475                                                       rx_fib_index0,
1476                                                       thread_index, now,
1477                                                       vm, node);
1478                   if (!s0)
1479                     next0 = NAT_NEXT_DROP;
1480                   other_packets++;
1481                   goto trace0;
1482                 }
1483
1484               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1485                 {
1486                   next0 = icmp_in2out_ed_slow_path
1487                     (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0,
1488                      node, next0, now, thread_index, &s0);
1489                   icmp_packets++;
1490                   goto trace0;
1491                 }
1492             }
1493           else
1494             {
1495               if (PREDICT_FALSE (proto0 == ~0))
1496                 {
1497                   next0 = def_slow;
1498                   goto trace0;
1499                 }
1500
1501               if (is_output_feature)
1502                 {
1503                   if (PREDICT_FALSE
1504                       (nat_not_translate_output_feature_fwd
1505                        (sm, ip0, thread_index, now, vm, b0)))
1506                     goto trace0;
1507                 }
1508
1509               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1510                 {
1511                   next0 = def_slow;
1512                   goto trace0;
1513                 }
1514             }
1515
1516           make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1517                       ip0->protocol, rx_fib_index0,
1518                       vnet_buffer (b0)->ip.reass.l4_src_port,
1519                       vnet_buffer (b0)->ip.reass.l4_dst_port);
1520
1521           if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1522             {
1523               if (is_slow_path)
1524                 {
1525                   if (is_output_feature)
1526                     {
1527                       if (PREDICT_FALSE
1528                           (nat44_ed_not_translate_output_feature
1529                            (sm, ip0, ip0->protocol,
1530                             vnet_buffer (b0)->ip.reass.l4_src_port,
1531                             vnet_buffer (b0)->ip.reass.l4_dst_port,
1532                             thread_index, sw_if_index0,
1533                             vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1534                         goto trace0;
1535
1536                       /*
1537                        * Send DHCP packets to the ipv4 stack, or we won't
1538                        * be able to use dhcp client on the outside interface
1539                        */
1540                       if (PREDICT_FALSE
1541                           ((b0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)
1542                            && proto0 == SNAT_PROTOCOL_UDP
1543                            && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
1544                                clib_host_to_net_u16
1545                                (UDP_DST_PORT_dhcp_to_server))))
1546                         goto trace0;
1547                     }
1548                   else
1549                     {
1550                       if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1551                                                                  sw_if_index0,
1552                                                                  ip0,
1553                                                                  proto0,
1554                                                                  rx_fib_index0,
1555                                                                  thread_index)))
1556                         goto trace0;
1557                     }
1558
1559                   next0 =
1560                     slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1561                                   next0, thread_index, now);
1562
1563                   if (PREDICT_FALSE (next0 == NAT_NEXT_DROP))
1564                     goto trace0;
1565
1566                   if (PREDICT_FALSE (!s0))
1567                     goto trace0;
1568                 }
1569               else
1570                 {
1571                   next0 = def_slow;
1572                   goto trace0;
1573                 }
1574             }
1575           else
1576             {
1577               s0 = pool_elt_at_index (tsm->sessions, value0.value);
1578             }
1579
1580           b0->flags |= VNET_BUFFER_F_IS_NATED;
1581
1582           if (!is_output_feature)
1583             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1584
1585           old_addr0 = ip0->src_address.as_u32;
1586           new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1587           sum0 = ip0->checksum;
1588           sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1589                                  src_address);
1590           if (PREDICT_FALSE (is_twice_nat_session (s0)))
1591             sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1592                                    s0->ext_host_addr.as_u32, ip4_header_t,
1593                                    dst_address);
1594           ip0->checksum = ip_csum_fold (sum0);
1595
1596           old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1597
1598           if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1599             {
1600               if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1601                 {
1602                   new_port0 = udp0->src_port = s0->out2in.port;
1603                   sum0 = tcp0->checksum;
1604                   sum0 =
1605                     ip_csum_update (sum0, old_addr0, new_addr0,
1606                                     ip4_header_t, dst_address);
1607                   sum0 =
1608                     ip_csum_update (sum0, old_port0, new_port0,
1609                                     ip4_header_t, length);
1610                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1611                     {
1612                       sum0 =
1613                         ip_csum_update (sum0, ip0->dst_address.as_u32,
1614                                         s0->ext_host_addr.as_u32,
1615                                         ip4_header_t, dst_address);
1616                       sum0 =
1617                         ip_csum_update (sum0,
1618                                         vnet_buffer (b0)->ip.
1619                                         reass.l4_dst_port, s0->ext_host_port,
1620                                         ip4_header_t, length);
1621                       tcp0->dst_port = s0->ext_host_port;
1622                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1623                     }
1624                   mss_clamping (sm, tcp0, &sum0);
1625                   tcp0->checksum = ip_csum_fold (sum0);
1626                 }
1627               tcp_packets++;
1628               if (nat44_set_tcp_session_state_i2o (sm, s0, b0, thread_index))
1629                 goto trace0;
1630             }
1631           else if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment
1632                    && udp0->checksum)
1633             {
1634               new_port0 = udp0->src_port = s0->out2in.port;
1635               sum0 = udp0->checksum;
1636               sum0 =
1637                 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1638                                 dst_address);
1639               sum0 =
1640                 ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1641                                 length);
1642               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1643                 {
1644                   sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1645                                          s0->ext_host_addr.as_u32,
1646                                          ip4_header_t, dst_address);
1647                   sum0 =
1648                     ip_csum_update (sum0,
1649                                     vnet_buffer (b0)->ip.reass.l4_dst_port,
1650                                     s0->ext_host_port, ip4_header_t, length);
1651                   udp0->dst_port = s0->ext_host_port;
1652                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1653                 }
1654               udp0->checksum = ip_csum_fold (sum0);
1655               udp_packets++;
1656             }
1657           else
1658             {
1659               if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1660                 {
1661                   new_port0 = udp0->src_port = s0->out2in.port;
1662                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1663                     {
1664                       udp0->dst_port = s0->ext_host_port;
1665                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1666                     }
1667                   udp_packets++;
1668                 }
1669             }
1670
1671           /* Accounting */
1672           nat44_session_update_counters (s0, now,
1673                                          vlib_buffer_length_in_chain
1674                                          (vm, b0), thread_index);
1675           /* Per-user LRU list maintenance */
1676           nat44_session_update_lru (sm, s0, thread_index);
1677
1678         trace0:
1679           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1680                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1681             {
1682               nat_in2out_ed_trace_t *t =
1683                 vlib_add_trace (vm, node, b0, sizeof (*t));
1684               t->is_slow_path = is_slow_path;
1685               t->sw_if_index = sw_if_index0;
1686               t->next_index = next0;
1687               t->session_index = ~0;
1688               if (s0)
1689                 t->session_index = s0 - tsm->sessions;
1690             }
1691
1692           pkts_processed += next0 == nat_buffer_opaque (b0)->arc_next;
1693
1694           /* verify speculative enqueue, maybe switch current next frame */
1695           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1696                                            to_next, n_left_to_next,
1697                                            bi0, next0);
1698         }
1699
1700       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1701     }
1702
1703   vlib_node_increment_counter (vm, stats_node_index,
1704                                NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
1705                                pkts_processed);
1706   vlib_node_increment_counter (vm, stats_node_index,
1707                                NAT_IN2OUT_ED_ERROR_TCP_PACKETS, tcp_packets);
1708   vlib_node_increment_counter (vm, stats_node_index,
1709                                NAT_IN2OUT_ED_ERROR_UDP_PACKETS, udp_packets);
1710   vlib_node_increment_counter (vm, stats_node_index,
1711                                NAT_IN2OUT_ED_ERROR_ICMP_PACKETS,
1712                                icmp_packets);
1713   vlib_node_increment_counter (vm, stats_node_index,
1714                                NAT_IN2OUT_ED_ERROR_OTHER_PACKETS,
1715                                other_packets);
1716   return frame->n_vectors;
1717 }
1718
1719 VLIB_NODE_FN (nat44_ed_in2out_node) (vlib_main_t * vm,
1720                                      vlib_node_runtime_t * node,
1721                                      vlib_frame_t * frame)
1722 {
1723   return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 0);
1724 }
1725
1726 /* *INDENT-OFF* */
1727 VLIB_REGISTER_NODE (nat44_ed_in2out_node) = {
1728   .name = "nat44-ed-in2out",
1729   .vector_size = sizeof (u32),
1730   .sibling_of = "nat-default",
1731   .format_trace = format_nat_in2out_ed_trace,
1732   .type = VLIB_NODE_TYPE_INTERNAL,
1733   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1734   .error_strings = nat_in2out_ed_error_strings,
1735   .runtime_data_bytes = sizeof (snat_runtime_t),
1736 };
1737 /* *INDENT-ON* */
1738
1739 VLIB_NODE_FN (nat44_ed_in2out_output_node) (vlib_main_t * vm,
1740                                             vlib_node_runtime_t * node,
1741                                             vlib_frame_t * frame)
1742 {
1743   return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 1);
1744 }
1745
1746 /* *INDENT-OFF* */
1747 VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = {
1748   .name = "nat44-ed-in2out-output",
1749   .vector_size = sizeof (u32),
1750   .sibling_of = "nat-default",
1751   .format_trace = format_nat_in2out_ed_trace,
1752   .type = VLIB_NODE_TYPE_INTERNAL,
1753   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1754   .error_strings = nat_in2out_ed_error_strings,
1755   .runtime_data_bytes = sizeof (snat_runtime_t),
1756 };
1757 /* *INDENT-ON* */
1758
1759 VLIB_NODE_FN (nat44_ed_in2out_slowpath_node) (vlib_main_t * vm,
1760                                               vlib_node_runtime_t *
1761                                               node, vlib_frame_t * frame)
1762 {
1763   return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 0);
1764 }
1765
1766 /* *INDENT-OFF* */
1767 VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = {
1768   .name = "nat44-ed-in2out-slowpath",
1769   .vector_size = sizeof (u32),
1770   .sibling_of = "nat-default",
1771   .format_trace = format_nat_in2out_ed_trace,
1772   .type = VLIB_NODE_TYPE_INTERNAL,
1773   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1774   .error_strings = nat_in2out_ed_error_strings,
1775   .runtime_data_bytes = sizeof (snat_runtime_t),
1776 };
1777 /* *INDENT-ON* */
1778
1779 VLIB_NODE_FN (nat44_ed_in2out_output_slowpath_node) (vlib_main_t * vm,
1780                                                      vlib_node_runtime_t
1781                                                      * node,
1782                                                      vlib_frame_t * frame)
1783 {
1784   return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 1);
1785 }
1786
1787 /* *INDENT-OFF* */
1788 VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = {
1789   .name = "nat44-ed-in2out-output-slowpath",
1790   .vector_size = sizeof (u32),
1791   .sibling_of = "nat-default",
1792   .format_trace = format_nat_in2out_ed_trace,
1793   .type = VLIB_NODE_TYPE_INTERNAL,
1794   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1795   .error_strings = nat_in2out_ed_error_strings,
1796   .runtime_data_bytes = sizeof (snat_runtime_t),
1797 };
1798 /* *INDENT-ON* */
1799
1800 static u8 *
1801 format_nat_pre_trace (u8 * s, va_list * args)
1802 {
1803   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1804   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1805   nat_pre_trace_t *t = va_arg (*args, nat_pre_trace_t *);
1806   return format (s, "in2out next_index %d", t->next_index);
1807 }
1808
1809 VLIB_NODE_FN (nat_pre_in2out_node)
1810   (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1811 {
1812   return nat_pre_node_fn_inline (vm, node, frame,
1813                                  NAT_NEXT_IN2OUT_ED_FAST_PATH);
1814 }
1815
1816 /* *INDENT-OFF* */
1817 VLIB_REGISTER_NODE (nat_pre_in2out_node) = {
1818   .name = "nat-pre-in2out",
1819   .vector_size = sizeof (u32),
1820   .sibling_of = "nat-default",
1821   .format_trace = format_nat_pre_trace,
1822   .type = VLIB_NODE_TYPE_INTERNAL,
1823   .n_errors = 0,
1824 };
1825 /* *INDENT-ON* */
1826
1827 /*
1828  * fd.io coding-style-patch-verification: ON
1829  *
1830  * Local Variables:
1831  * eval: (c-set-style "gnu")
1832  * End:
1833  */