src/plugins/nat/nat44-ei/nat44_ei_in2out.c

   1 /*
   2  * Copyright (c) 2016 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 EI inside to outside network translation
  18  */
  19
  20 #include <vlib/vlib.h>
  21
  22 #include <vnet/vnet.h>
  23 #include <vnet/ip/ip.h>
  24 #include <vnet/ethernet/ethernet.h>
  25 #include <vnet/udp/udp_local.h>
  26 #include <vnet/fib/ip4_fib.h>
  27
  28 #include <vppinfra/hash.h>
  29 #include <vppinfra/error.h>
  30
  31 #include <nat/lib/log.h>
  32 #include <nat/lib/nat_syslog.h>
  33 #include <nat/lib/ipfix_logging.h>
  34 #include <nat/lib/nat_inlines.h>
  35 #include <nat/nat44-ei/nat44_ei_inlines.h>
  36 #include <nat/nat44-ei/nat44_ei.h>
  37 #include <nat/nat44-ei/nat44_ei_hairpinning.h>
  38
  39 typedef struct
  40 {
  41   u32 sw_if_index;
  42   u32 next_index;
  43   u32 session_index;
  44   u32 is_slow_path;
  45   u32 is_hairpinning;
  46 } nat44_ei_in2out_trace_t;
  47
  48 /* packet trace format function */
  49 static u8 *
  50 format_nat44_ei_in2out_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   nat44_ei_in2out_trace_t *t = va_arg (*args, nat44_ei_in2out_trace_t *);
  55   char *tag;
  56
  57   tag = t->is_slow_path ? "NAT44_IN2OUT_SLOW_PATH" : "NAT44_IN2OUT_FAST_PATH";
  58
  59   s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
  60               t->sw_if_index, t->next_index, t->session_index);
  61   if (t->is_hairpinning)
  62     {
  63       s = format (s, ", with-hairpinning");
  64     }
  65
  66   return s;
  67 }
  68
  69 static u8 *
  70 format_nat44_ei_in2out_fast_trace (u8 *s, va_list *args)
  71 {
  72   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  73   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  74   nat44_ei_in2out_trace_t *t = va_arg (*args, nat44_ei_in2out_trace_t *);
  75
  76   s = format (s, "NAT44_IN2OUT_FAST: sw_if_index %d, next index %d",
  77               t->sw_if_index, t->next_index);
  78
  79   return s;
  80 }
  81
  82 #define foreach_nat44_ei_in2out_error                                         \
  83   _ (UNSUPPORTED_PROTOCOL, "unsupported protocol")                            \
  84   _ (OUT_OF_PORTS, "out of ports")                                            \
  85   _ (BAD_OUTSIDE_FIB, "outside VRF ID not found")                             \
  86   _ (BAD_ICMP_TYPE, "unsupported ICMP type")                                  \
  87   _ (NO_TRANSLATION, "no translation")                                        \
  88   _ (MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded")                      \
  89   _ (CANNOT_CREATE_USER, "cannot create NAT user")
  90
  91 typedef enum
  92 {
  93 #define _(sym, str) NAT44_EI_IN2OUT_ERROR_##sym,
  94   foreach_nat44_ei_in2out_error
  95 #undef _
  96     NAT44_EI_IN2OUT_N_ERROR,
  97 } nat44_ei_in2out_error_t;
  98
  99 static char *nat44_ei_in2out_error_strings[] = {
 100 #define _(sym,string) string,
 101   foreach_nat44_ei_in2out_error
 102 #undef _
 103 };
 104
 105 typedef enum
 106 {
 107   NAT44_EI_IN2OUT_NEXT_LOOKUP,
 108   NAT44_EI_IN2OUT_NEXT_DROP,
 109   NAT44_EI_IN2OUT_NEXT_ICMP_ERROR,
 110   NAT44_EI_IN2OUT_NEXT_SLOW_PATH,
 111   NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF,
 112   NAT44_EI_IN2OUT_N_NEXT,
 113 } nat44_ei_in2out_next_t;
 114
 115 typedef enum
 116 {
 117   NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_DROP,
 118   NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_LOOKUP,
 119   NAT44_EI_IN2OUT_HAIRPINNING_FINISH_N_NEXT,
 120 } nat44_ei_in2out_hairpinnig_finish_next_t;
 121
 122 static inline int
 123 nat44_ei_not_translate_fast (vlib_node_runtime_t *node, u32 sw_if_index0,
 124                              ip4_header_t *ip0, u32 proto0, u32 rx_fib_index0)
 125 {
 126   nat44_ei_main_t *nm = &nat44_ei_main;
 127
 128   if (nm->out2in_dpo)
 129     return 0;
 130
 131   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
 132   nat44_ei_outside_fib_t *outside_fib;
 133   fib_prefix_t pfx = {
 134     .fp_proto = FIB_PROTOCOL_IP4,
 135     .fp_len = 32,
 136     .fp_addr = {
 137                 .ip4.as_u32 = ip0->dst_address.as_u32,
 138                 }
 139     ,
 140   };
 141
 142   /* Don't NAT packet aimed at the intfc address */
 143   if (PREDICT_FALSE (nat44_ei_is_interface_addr (
 144         nm->ip4_main, node, sw_if_index0, ip0->dst_address.as_u32)))
 145     return 1;
 146
 147   fei = fib_table_lookup (rx_fib_index0, &pfx);
 148   if (FIB_NODE_INDEX_INVALID != fei)
 149     {
 150       u32 sw_if_index = fib_entry_get_resolving_interface (fei);
 151       if (sw_if_index == ~0)
 152         {
 153           vec_foreach (outside_fib, nm->outside_fibs)
 154             {
 155               fei = fib_table_lookup (outside_fib->fib_index, &pfx);
 156               if (FIB_NODE_INDEX_INVALID != fei)
 157                 {
 158                   sw_if_index = fib_entry_get_resolving_interface (fei);
 159                   if (sw_if_index != ~0)
 160                     break;
 161                 }
 162             }
 163         }
 164       if (sw_if_index == ~0)
 165         return 1;
 166
 167       nat44_ei_interface_t *i;
 168       pool_foreach (i, nm->interfaces)
 169         {
 170           /* NAT packet aimed at outside interface */
 171           if ((nat44_ei_interface_is_outside (i)) &&
 172               (sw_if_index == i->sw_if_index))
 173             return 0;
 174         }
 175     }
 176
 177   return 1;
 178 }
 179
 180 static inline int
 181 nat44_ei_not_translate (nat44_ei_main_t *nm, vlib_node_runtime_t *node,
 182                         u32 sw_if_index0, ip4_header_t *ip0, u32 proto0,
 183                         u32 rx_fib_index0, u32 thread_index)
 184 {
 185   udp_header_t *udp0 = ip4_next_header (ip0);
 186   clib_bihash_kv_8_8_t kv0, value0;
 187
 188   init_nat_k (&kv0, ip0->dst_address, udp0->dst_port, nm->outside_fib_index,
 189               proto0);
 190
 191   /* NAT packet aimed at external address if */
 192   /* has active sessions */
 193   if (clib_bihash_search_8_8 (&nm->out2in, &kv0, &value0))
 194     {
 195       /* or is static mappings */
 196       ip4_address_t placeholder_addr;
 197       u16 placeholder_port;
 198       u32 placeholder_fib_index;
 199       if (!nat44_ei_static_mapping_match (ip0->dst_address, udp0->dst_port,
 200                                           nm->outside_fib_index, proto0,
 201                                           &placeholder_addr, &placeholder_port,
 202                                           &placeholder_fib_index, 1, 0, 0))
 203         return 0;
 204     }
 205   else
 206     return 0;
 207
 208   if (nm->forwarding_enabled)
 209     return 1;
 210
 211   return nat44_ei_not_translate_fast (node, sw_if_index0, ip0, proto0,
 212                                       rx_fib_index0);
 213 }
 214
 215 static inline int
 216 nat44_ei_not_translate_output_feature (nat44_ei_main_t *nm, ip4_header_t *ip0,
 217                                        u32 proto0, u16 src_port, u16 dst_port,
 218                                        u32 thread_index, u32 sw_if_index)
 219 {
 220   clib_bihash_kv_8_8_t kv0, value0;
 221   nat44_ei_interface_t *i;
 222
 223   /* src NAT check */
 224   init_nat_k (&kv0, ip0->src_address, src_port,
 225               ip4_fib_table_get_index_for_sw_if_index (sw_if_index), proto0);
 226
 227   if (!clib_bihash_search_8_8 (&nm->out2in, &kv0, &value0))
 228     return 1;
 229
 230   /* dst NAT check */
 231   init_nat_k (&kv0, ip0->dst_address, dst_port,
 232               ip4_fib_table_get_index_for_sw_if_index (sw_if_index), proto0);
 233   if (!clib_bihash_search_8_8 (&nm->in2out, &kv0, &value0))
 234     {
 235       /* hairpinning */
 236       pool_foreach (i, nm->output_feature_interfaces)
 237         {
 238           if ((nat44_ei_interface_is_inside (i)) &&
 239               (sw_if_index == i->sw_if_index))
 240             return 0;
 241         }
 242       return 1;
 243     }
 244
 245   return 0;
 246 }
 247
 248 #ifndef CLIB_MARCH_VARIANT
 249 int
 250 nat44_i2o_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg)
 251 {
 252   nat44_ei_main_t *nm = &nat44_ei_main;
 253   nat44_ei_is_idle_session_ctx_t *ctx = arg;
 254   nat44_ei_session_t *s;
 255   u64 sess_timeout_time;
 256   nat44_ei_main_per_thread_data_t *tnm =
 257     vec_elt_at_index (nm->per_thread_data, ctx->thread_index);
 258   clib_bihash_kv_8_8_t s_kv;
 259
 260   if (ctx->thread_index != nat_value_get_thread_index (kv))
 261     {
 262       return 0;
 263     }
 264
 265   s = pool_elt_at_index (tnm->sessions, nat_value_get_session_index (kv));
 266   sess_timeout_time = s->last_heard + (f64) nat_session_get_timeout (
 267                                         &nm->timeouts, s->nat_proto, s->state);
 268   if (ctx->now >= sess_timeout_time)
 269     {
 270       init_nat_o2i_k (&s_kv, s);
 271       if (clib_bihash_add_del_8_8 (&nm->out2in, &s_kv, 0))
 272         nat_elog_warn (nm, "out2in key del failed");
 273
 274       nat_ipfix_logging_nat44_ses_delete (
 275         ctx->thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32,
 276         nat_proto_to_ip_proto (s->nat_proto), s->in2out.port, s->out2in.port,
 277         s->in2out.fib_index);
 278
 279       nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
 280                                &s->in2out.addr, s->in2out.port,
 281                                &s->out2in.addr, s->out2in.port, s->nat_proto);
 282
 283       nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
 284                    s->ext_host_port, s->nat_proto, s->out2in.fib_index,
 285                    ctx->thread_index);
 286
 287       if (!nat44_ei_is_session_static (s))
 288         nat44_ei_free_outside_address_and_port (
 289           nm->addresses, ctx->thread_index, &s->out2in.addr, s->out2in.port,
 290           s->nat_proto);
 291
 292       nat44_ei_delete_session (nm, s, ctx->thread_index);
 293       return 1;
 294     }
 295
 296   return 0;
 297 }
 298 #endif
 299
 300 static u32
 301 slow_path (nat44_ei_main_t *nm, vlib_buffer_t *b0, ip4_header_t *ip0,
 302            ip4_address_t i2o_addr, u16 i2o_port, u32 rx_fib_index0,
 303            nat_protocol_t nat_proto, nat44_ei_session_t **sessionp,
 304            vlib_node_runtime_t *node, u32 next0, u32 thread_index, f64 now)
 305 {
 306   nat44_ei_user_t *u;
 307   nat44_ei_session_t *s = 0;
 308   clib_bihash_kv_8_8_t kv0;
 309   u8 is_sm = 0;
 310   nat44_ei_outside_fib_t *outside_fib;
 311   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
 312   u8 identity_nat;
 313   fib_prefix_t pfx = {
 314     .fp_proto = FIB_PROTOCOL_IP4,
 315     .fp_len = 32,
 316     .fp_addr = {
 317                 .ip4.as_u32 = ip0->dst_address.as_u32,
 318                 },
 319   };
 320   nat44_ei_is_idle_session_ctx_t ctx0;
 321   ip4_address_t sm_addr;
 322   u16 sm_port;
 323   u32 sm_fib_index;
 324
 325   if (PREDICT_FALSE (nat44_ei_maximum_sessions_exceeded (nm, thread_index)))
 326     {
 327       b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED];
 328       nat_ipfix_logging_max_sessions (thread_index,
 329                                       nm->max_translations_per_thread);
 330       nat_elog_notice (nm, "maximum sessions exceeded");
 331       return NAT44_EI_IN2OUT_NEXT_DROP;
 332     }
 333
 334   /* First try to match static mapping by local address and port */
 335   if (nat44_ei_static_mapping_match (i2o_addr, i2o_port, rx_fib_index0,
 336                                      nat_proto, &sm_addr, &sm_port,
 337                                      &sm_fib_index, 0, 0, &identity_nat))
 338     {
 339       /* Try to create dynamic translation */
 340       if (nm->alloc_addr_and_port (
 341             nm->addresses, rx_fib_index0, thread_index, nat_proto,
 342             ip0->src_address, &sm_addr, &sm_port, nm->port_per_thread,
 343             nm->per_thread_data[thread_index].snat_thread_index))
 344         {
 345           b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_OUT_OF_PORTS];
 346           return NAT44_EI_IN2OUT_NEXT_DROP;
 347         }
 348     }
 349   else
 350     {
 351       if (PREDICT_FALSE (identity_nat))
 352         {
 353           *sessionp = s;
 354           return next0;
 355         }
 356
 357       is_sm = 1;
 358     }
 359
 360   u = nat44_ei_user_get_or_create (nm, &ip0->src_address, rx_fib_index0,
 361                                    thread_index);
 362   if (!u)
 363     {
 364       b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_CANNOT_CREATE_USER];
 365       return NAT44_EI_IN2OUT_NEXT_DROP;
 366     }
 367
 368   s = nat44_ei_session_alloc_or_recycle (nm, u, thread_index, now);
 369   if (!s)
 370     {
 371       nat44_ei_delete_user_with_no_session (nm, u, thread_index);
 372       nat_elog_warn (nm, "create NAT session failed");
 373       return NAT44_EI_IN2OUT_NEXT_DROP;
 374     }
 375
 376   if (is_sm)
 377     s->flags |= NAT44_EI_SESSION_FLAG_STATIC_MAPPING;
 378   nat44_ei_user_session_increment (nm, u, is_sm);
 379   s->in2out.addr = i2o_addr;
 380   s->in2out.port = i2o_port;
 381   s->in2out.fib_index = rx_fib_index0;
 382   s->nat_proto = nat_proto;
 383   s->out2in.addr = sm_addr;
 384   s->out2in.port = sm_port;
 385   s->out2in.fib_index = nm->outside_fib_index;
 386   switch (vec_len (nm->outside_fibs))
 387     {
 388     case 0:
 389       s->out2in.fib_index = nm->outside_fib_index;
 390       break;
 391     case 1:
 392       s->out2in.fib_index = nm->outside_fibs[0].fib_index;
 393       break;
 394     default:
 395       vec_foreach (outside_fib, nm->outside_fibs)
 396         {
 397           fei = fib_table_lookup (outside_fib->fib_index, &pfx);
 398           if (FIB_NODE_INDEX_INVALID != fei)
 399             {
 400               if (fib_entry_get_resolving_interface (fei) != ~0)
 401                 {
 402                   s->out2in.fib_index = outside_fib->fib_index;
 403                   break;
 404                 }
 405             }
 406         }
 407       break;
 408     }
 409   s->ext_host_addr.as_u32 = ip0->dst_address.as_u32;
 410   s->ext_host_port = vnet_buffer (b0)->ip.reass.l4_dst_port;
 411   *sessionp = s;
 412
 413   /* Add to translation hashes */
 414   ctx0.now = now;
 415   ctx0.thread_index = thread_index;
 416   init_nat_i2o_kv (&kv0, s, thread_index,
 417                    s - nm->per_thread_data[thread_index].sessions);
 418   if (clib_bihash_add_or_overwrite_stale_8_8 (
 419         &nm->in2out, &kv0, nat44_i2o_is_idle_session_cb, &ctx0))
 420     nat_elog_notice (nm, "in2out key add failed");
 421
 422   init_nat_o2i_kv (&kv0, s, thread_index,
 423                    s - nm->per_thread_data[thread_index].sessions);
 424   if (clib_bihash_add_or_overwrite_stale_8_8 (
 425         &nm->out2in, &kv0, nat44_o2i_is_idle_session_cb, &ctx0))
 426     nat_elog_notice (nm, "out2in key add failed");
 427
 428   /* log NAT event */
 429   nat_ipfix_logging_nat44_ses_create (
 430     thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32,
 431     nat_proto_to_ip_proto (s->nat_proto), s->in2out.port, s->out2in.port,
 432     s->in2out.fib_index);
 433
 434   nat_syslog_nat44_apmadd (s->user_index, s->in2out.fib_index, &s->in2out.addr,
 435                            s->in2out.port, &s->out2in.addr, s->out2in.port,
 436                            s->nat_proto);
 437
 438   nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
 439                s->out2in.port, &s->ext_host_addr, s->ext_host_port,
 440                &s->ext_host_nat_addr, s->ext_host_nat_port, s->nat_proto,
 441                s->in2out.fib_index, s->flags, thread_index, 0);
 442
 443   return next0;
 444 }
 445
 446 #ifndef CLIB_MARCH_VARIANT
 447 static_always_inline nat44_ei_in2out_error_t
 448 icmp_get_key (vlib_buffer_t *b, ip4_header_t *ip0, ip4_address_t *addr,
 449               u16 *port, nat_protocol_t *nat_proto)
 450 {
 451   icmp46_header_t *icmp0;
 452   icmp_echo_header_t *echo0, *inner_echo0 = 0;
 453   ip4_header_t *inner_ip0 = 0;
 454   void *l4_header = 0;
 455   icmp46_header_t *inner_icmp0;
 456
 457   icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
 458   echo0 = (icmp_echo_header_t *) (icmp0 + 1);
 459
 460   if (!icmp_type_is_error_message
 461       (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
 462     {
 463       *nat_proto = NAT_PROTOCOL_ICMP;
 464       *addr = ip0->src_address;
 465       *port = vnet_buffer (b)->ip.reass.l4_src_port;
 466     }
 467   else
 468     {
 469       inner_ip0 = (ip4_header_t *) (echo0 + 1);
 470       l4_header = ip4_next_header (inner_ip0);
 471       *nat_proto = ip_proto_to_nat_proto (inner_ip0->protocol);
 472       *addr = inner_ip0->dst_address;
 473       switch (*nat_proto)
 474         {
 475         case NAT_PROTOCOL_ICMP:
 476           inner_icmp0 = (icmp46_header_t *) l4_header;
 477           inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
 478           *port = inner_echo0->identifier;
 479           break;
 480         case NAT_PROTOCOL_UDP:
 481         case NAT_PROTOCOL_TCP:
 482           *port = ((tcp_udp_header_t *) l4_header)->dst_port;
 483           break;
 484         default:
 485           return NAT44_EI_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL;
 486         }
 487     }
 488   return -1;                    /* success */
 489 }
 490
 491 /**
 492  * Get address and port values to be used for ICMP packet translation
 493  * and create session if needed
 494  *
 495  * @param[in,out] nm             NAT main
 496  * @param[in,out] node           NAT node runtime
 497  * @param[in] thread_index       thread index
 498  * @param[in,out] b0             buffer containing packet to be translated
 499  * @param[in,out] ip0            ip header
 500  * @param[out] p_proto           protocol used for matching
 501  * @param[out] p_value           address and port after NAT translation
 502  * @param[out] p_dont_translate  if packet should not be translated
 503  * @param d                      optional parameter
 504  * @param e                      optional parameter
 505  */
 506 u32
 507 nat44_ei_icmp_match_in2out_slow (vlib_node_runtime_t *node, u32 thread_index,
 508                                  vlib_buffer_t *b0, ip4_header_t *ip0,
 509                                  ip4_address_t *addr, u16 *port,
 510                                  u32 *fib_index, nat_protocol_t *proto,
 511                                  nat44_ei_session_t **p_s0, u8 *dont_translate)
 512 {
 513   nat44_ei_main_t *nm = &nat44_ei_main;
 514   nat44_ei_main_per_thread_data_t *tnm = &nm->per_thread_data[thread_index];
 515   u32 sw_if_index0;
 516   nat44_ei_session_t *s0 = 0;
 517   clib_bihash_kv_8_8_t kv0, value0;
 518   u32 next0 = ~0;
 519   int err;
 520   vlib_main_t *vm = vlib_get_main ();
 521   *dont_translate = 0;
 522
 523   sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 524   *fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
 525
 526   err = icmp_get_key (b0, ip0, addr, port, proto);
 527   if (err != -1)
 528     {
 529       b0->error = node->errors[err];
 530       next0 = NAT44_EI_IN2OUT_NEXT_DROP;
 531       goto out;
 532     }
 533
 534   init_nat_k (&kv0, *addr, *port, *fib_index, *proto);
 535   if (clib_bihash_search_8_8 (&nm->in2out, &kv0, &value0))
 536     {
 537       if (vnet_buffer (b0)->sw_if_index[VLIB_TX] != ~0)
 538         {
 539           if (PREDICT_FALSE (nat44_ei_not_translate_output_feature (
 540                 nm, ip0, *proto, *port, *port, thread_index, sw_if_index0)))
 541             {
 542               *dont_translate = 1;
 543               goto out;
 544             }
 545         }
 546       else
 547         {
 548           if (PREDICT_FALSE (nat44_ei_not_translate (
 549                 nm, node, sw_if_index0, ip0, NAT_PROTOCOL_ICMP, *fib_index,
 550                 thread_index)))
 551             {
 552               *dont_translate = 1;
 553               goto out;
 554             }
 555         }
 556
 557       if (PREDICT_FALSE
 558           (icmp_type_is_error_message
 559            (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags)))
 560         {
 561           b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_BAD_ICMP_TYPE];
 562           next0 = NAT44_EI_IN2OUT_NEXT_DROP;
 563           goto out;
 564         }
 565
 566       next0 = slow_path (nm, b0, ip0, *addr, *port, *fib_index, *proto, &s0,
 567                          node, next0, thread_index, vlib_time_now (vm));
 568
 569       if (PREDICT_FALSE (next0 == NAT44_EI_IN2OUT_NEXT_DROP))
 570         goto out;
 571
 572       if (!s0)
 573         {
 574           *dont_translate = 1;
 575           goto out;
 576         }
 577     }
 578   else
 579     {
 580       if (PREDICT_FALSE
 581           (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
 582            ICMP4_echo_request
 583            && vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
 584            ICMP4_echo_reply
 585            && !icmp_type_is_error_message (vnet_buffer (b0)->ip.
 586                                            reass.icmp_type_or_tcp_flags)))
 587         {
 588           b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_BAD_ICMP_TYPE];
 589           next0 = NAT44_EI_IN2OUT_NEXT_DROP;
 590           goto out;
 591         }
 592
 593       s0 = pool_elt_at_index (tnm->sessions,
 594                               nat_value_get_session_index (&value0));
 595     }
 596
 597 out:
 598   if (s0)
 599     {
 600       *addr = s0->out2in.addr;
 601       *port = s0->out2in.port;
 602       *fib_index = s0->out2in.fib_index;
 603     }
 604   if (p_s0)
 605     *p_s0 = s0;
 606   return next0;
 607 }
 608 #endif
 609
 610 #ifndef CLIB_MARCH_VARIANT
 611 u32
 612 nat44_ei_icmp_match_in2out_fast (vlib_node_runtime_t *node, u32 thread_index,
 613                                  vlib_buffer_t *b0, ip4_header_t *ip0,
 614                                  ip4_address_t *addr, u16 *port,
 615                                  u32 *fib_index, nat_protocol_t *proto,
 616                                  nat44_ei_session_t **s0, u8 *dont_translate)
 617 {
 618   u32 sw_if_index0;
 619   u8 is_addr_only;
 620   u32 next0 = ~0;
 621   int err;
 622   *dont_translate = 0;
 623
 624   sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 625   *fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
 626
 627   err = icmp_get_key (b0, ip0, addr, port, proto);
 628   if (err != -1)
 629     {
 630       b0->error = node->errors[err];
 631       next0 = NAT44_EI_IN2OUT_NEXT_DROP;
 632       goto out;
 633     }
 634
 635   ip4_address_t sm_addr;
 636   u16 sm_port;
 637   u32 sm_fib_index;
 638
 639   if (nat44_ei_static_mapping_match (*addr, *port, *fib_index, *proto,
 640                                      &sm_addr, &sm_port, &sm_fib_index, 0,
 641                                      &is_addr_only, 0))
 642     {
 643       if (PREDICT_FALSE (nat44_ei_not_translate_fast (
 644             node, sw_if_index0, ip0, IP_PROTOCOL_ICMP, *fib_index)))
 645         {
 646           *dont_translate = 1;
 647           goto out;
 648         }
 649
 650       if (icmp_type_is_error_message
 651           (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags))
 652         {
 653           next0 = NAT44_EI_IN2OUT_NEXT_DROP;
 654           goto out;
 655         }
 656
 657       b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_NO_TRANSLATION];
 658       next0 = NAT44_EI_IN2OUT_NEXT_DROP;
 659       goto out;
 660     }
 661
 662   if (PREDICT_FALSE
 663       (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_request
 664        && (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
 665            ICMP4_echo_reply || !is_addr_only)
 666        && !icmp_type_is_error_message (vnet_buffer (b0)->ip.
 667                                        reass.icmp_type_or_tcp_flags)))
 668     {
 669       b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_BAD_ICMP_TYPE];
 670       next0 = NAT44_EI_IN2OUT_NEXT_DROP;
 671       goto out;
 672     }
 673
 674 out:
 675   return next0;
 676 }
 677 #endif
 678
 679 u32 nat44_ei_icmp_in2out (vlib_buffer_t *b0, ip4_header_t *ip0,
 680                           icmp46_header_t *icmp0, u32 sw_if_index0,
 681                           u32 rx_fib_index0, vlib_node_runtime_t *node,
 682                           u32 next0, u32 thread_index,
 683                           nat44_ei_session_t **p_s0);
 684
 685 #ifndef CLIB_MARCH_VARIANT
 686 u32
 687 nat44_ei_icmp_in2out (vlib_buffer_t *b0, ip4_header_t *ip0,
 688                       icmp46_header_t *icmp0, u32 sw_if_index0,
 689                       u32 rx_fib_index0, vlib_node_runtime_t *node, u32 next0,
 690                       u32 thread_index, nat44_ei_session_t **p_s0)
 691 {
 692   nat44_ei_main_t *nm = &nat44_ei_main;
 693   vlib_main_t *vm = vlib_get_main ();
 694   ip4_address_t addr;
 695   u16 port;
 696   u32 fib_index;
 697   nat_protocol_t proto;
 698   icmp_echo_header_t *echo0, *inner_echo0 = 0;
 699   ip4_header_t *inner_ip0;
 700   void *l4_header = 0;
 701   icmp46_header_t *inner_icmp0;
 702   u8 dont_translate;
 703   u32 new_addr0, old_addr0;
 704   u16 old_id0, new_id0;
 705   u16 old_checksum0, new_checksum0;
 706   ip_csum_t sum0;
 707   u16 checksum0;
 708   u32 next0_tmp;
 709   u32 required_thread_index = thread_index;
 710
 711   echo0 = (icmp_echo_header_t *) (icmp0 + 1);
 712
 713   if (PREDICT_TRUE (nm->pat))
 714     {
 715       next0_tmp = nat44_ei_icmp_match_in2out_slow (
 716         node, thread_index, b0, ip0, &addr, &port, &fib_index, &proto, p_s0,
 717         &dont_translate);
 718     }
 719   else
 720     {
 721       next0_tmp = nat44_ei_icmp_match_in2out_fast (
 722         node, thread_index, b0, ip0, &addr, &port, &fib_index, &proto, p_s0,
 723         &dont_translate);
 724     }
 725
 726   if (next0_tmp != ~0)
 727     next0 = next0_tmp;
 728   if (next0 == NAT44_EI_IN2OUT_NEXT_DROP || dont_translate)
 729     goto out;
 730
 731   if (PREDICT_TRUE (!ip4_is_fragment (ip0)))
 732     {
 733       sum0 =
 734         ip_incremental_checksum_buffer (vm, b0,
 735                                         (u8 *) icmp0 -
 736                                         (u8 *) vlib_buffer_get_current (b0),
 737                                         ntohs (ip0->length) -
 738                                         ip4_header_bytes (ip0), 0);
 739       checksum0 = ~ip_csum_fold (sum0);
 740       if (PREDICT_FALSE (checksum0 != 0 && checksum0 != 0xffff))
 741         {
 742           next0 = NAT44_EI_IN2OUT_NEXT_DROP;
 743           goto out;
 744         }
 745     }
 746
 747   old_addr0 = ip0->src_address.as_u32;
 748   new_addr0 = ip0->src_address.as_u32 = addr.as_u32;
 749
 750   sum0 = ip0->checksum;
 751   sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
 752                          src_address /* changed member */ );
 753   ip0->checksum = ip_csum_fold (sum0);
 754
 755   if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
 756     {
 757       if (icmp0->checksum == 0)
 758         icmp0->checksum = 0xffff;
 759
 760       if (!icmp_type_is_error_message (icmp0->type))
 761         {
 762           new_id0 = port;
 763           if (PREDICT_FALSE (new_id0 != echo0->identifier))
 764             {
 765               old_id0 = echo0->identifier;
 766               new_id0 = port;
 767               echo0->identifier = new_id0;
 768
 769               sum0 = icmp0->checksum;
 770               sum0 =
 771                 ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
 772                                 identifier);
 773               icmp0->checksum = ip_csum_fold (sum0);
 774             }
 775         }
 776       else
 777         {
 778           inner_ip0 = (ip4_header_t *) (echo0 + 1);
 779           l4_header = ip4_next_header (inner_ip0);
 780
 781           if (!ip4_header_checksum_is_valid (inner_ip0))
 782             {
 783               next0 = NAT44_EI_IN2OUT_NEXT_DROP;
 784               goto out;
 785             }
 786
 787           /* update inner destination IP address */
 788           old_addr0 = inner_ip0->dst_address.as_u32;
 789           inner_ip0->dst_address = addr;
 790           new_addr0 = inner_ip0->dst_address.as_u32;
 791           sum0 = icmp0->checksum;
 792           sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
 793                                  dst_address /* changed member */ );
 794           icmp0->checksum = ip_csum_fold (sum0);
 795
 796           /* update inner IP header checksum */
 797           old_checksum0 = inner_ip0->checksum;
 798           sum0 = inner_ip0->checksum;
 799           sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
 800                                  dst_address /* changed member */ );
 801           inner_ip0->checksum = ip_csum_fold (sum0);
 802           new_checksum0 = inner_ip0->checksum;
 803           sum0 = icmp0->checksum;
 804           sum0 =
 805             ip_csum_update (sum0, old_checksum0, new_checksum0, ip4_header_t,
 806                             checksum);
 807           icmp0->checksum = ip_csum_fold (sum0);
 808
 809           switch (proto)
 810             {
 811             case NAT_PROTOCOL_ICMP:
 812               inner_icmp0 = (icmp46_header_t *) l4_header;
 813               inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
 814
 815               old_id0 = inner_echo0->identifier;
 816               new_id0 = port;
 817               inner_echo0->identifier = new_id0;
 818
 819               sum0 = icmp0->checksum;
 820               sum0 =
 821                 ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
 822                                 identifier);
 823               icmp0->checksum = ip_csum_fold (sum0);
 824               break;
 825             case NAT_PROTOCOL_UDP:
 826             case NAT_PROTOCOL_TCP:
 827               old_id0 = ((tcp_udp_header_t *) l4_header)->dst_port;
 828               new_id0 = port;
 829               ((tcp_udp_header_t *) l4_header)->dst_port = new_id0;
 830
 831               sum0 = icmp0->checksum;
 832               sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t,
 833                                      dst_port);
 834               icmp0->checksum = ip_csum_fold (sum0);
 835               break;
 836             default:
 837               ASSERT (0);
 838             }
 839         }
 840     }
 841
 842   if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0)
 843     {
 844       if (0 != nat44_ei_icmp_hairpinning (nm, b0, thread_index, ip0, icmp0,
 845                                           &required_thread_index))
 846         vnet_buffer (b0)->sw_if_index[VLIB_TX] = fib_index;
 847       if (thread_index != required_thread_index)
 848         {
 849           vnet_buffer (b0)->snat.required_thread_index = required_thread_index;
 850           next0 = NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF;
 851         }
 852     }
 853
 854 out:
 855   return next0;
 856 }
 857 #endif
 858
 859 static_always_inline u32
 860 nat44_ei_icmp_in2out_slow_path (nat44_ei_main_t *nm, vlib_buffer_t *b0,
 861                                 ip4_header_t *ip0, icmp46_header_t *icmp0,
 862                                 u32 sw_if_index0, u32 rx_fib_index0,
 863                                 vlib_node_runtime_t *node, u32 next0, f64 now,
 864                                 u32 thread_index, nat44_ei_session_t **p_s0)
 865 {
 866   vlib_main_t *vm = vlib_get_main ();
 867
 868   next0 = nat44_ei_icmp_in2out (b0, ip0, icmp0, sw_if_index0, rx_fib_index0,
 869                                 node, next0, thread_index, p_s0);
 870   nat44_ei_session_t *s0 = *p_s0;
 871   if (PREDICT_TRUE (next0 != NAT44_EI_IN2OUT_NEXT_DROP && s0))
 872     {
 873       /* Accounting */
 874       nat44_ei_session_update_counters (
 875         s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index);
 876       /* Per-user LRU list maintenance */
 877       nat44_ei_session_update_lru (nm, s0, thread_index);
 878     }
 879   return next0;
 880 }
 881
 882 static int
 883 nat_in2out_sm_unknown_proto (nat44_ei_main_t *nm, vlib_buffer_t *b,
 884                              ip4_header_t *ip, u32 rx_fib_index)
 885 {
 886   clib_bihash_kv_8_8_t kv, value;
 887   nat44_ei_static_mapping_t *m;
 888   u32 old_addr, new_addr;
 889   ip_csum_t sum;
 890
 891   init_nat_k (&kv, ip->src_address, 0, rx_fib_index, 0);
 892   if (clib_bihash_search_8_8 (&nm->static_mapping_by_local, &kv, &value))
 893     return 1;
 894
 895   m = pool_elt_at_index (nm->static_mappings, value.value);
 896
 897   old_addr = ip->src_address.as_u32;
 898   new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
 899   sum = ip->checksum;
 900   sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
 901   ip->checksum = ip_csum_fold (sum);
 902
 903
 904   /* Hairpinning */
 905   if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
 906     {
 907       vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
 908       nat44_ei_hairpinning_sm_unknown_proto (nm, b, ip);
 909     }
 910
 911   return 0;
 912 }
 913
 914 static inline uword
 915 nat44_ei_in2out_node_fn_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
 916                                 vlib_frame_t *frame, int is_slow_path,
 917                                 int is_output_feature)
 918 {
 919   u32 n_left_from, *from;
 920   nat44_ei_main_t *nm = &nat44_ei_main;
 921   f64 now = vlib_time_now (vm);
 922   u32 thread_index = vm->thread_index;
 923
 924   from = vlib_frame_vector_args (frame);
 925   n_left_from = frame->n_vectors;
 926
 927   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
 928   u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
 929   vlib_get_buffers (vm, from, b, n_left_from);
 930
 931   while (n_left_from >= 2)
 932     {
 933       vlib_buffer_t *b0, *b1;
 934       u32 next0, next1;
 935       u32 rx_sw_if_index0, rx_sw_if_index1;
 936       u32 tx_sw_if_index0, tx_sw_if_index1;
 937       u32 cntr_sw_if_index0, cntr_sw_if_index1;
 938       ip4_header_t *ip0, *ip1;
 939       ip_csum_t sum0, sum1;
 940       u32 new_addr0, old_addr0, new_addr1, old_addr1;
 941       u16 old_port0, new_port0, old_port1, new_port1;
 942       udp_header_t *udp0, *udp1;
 943       tcp_header_t *tcp0, *tcp1;
 944       icmp46_header_t *icmp0, *icmp1;
 945       u32 rx_fib_index0, rx_fib_index1;
 946       u32 proto0, proto1;
 947       nat44_ei_session_t *s0 = 0, *s1 = 0;
 948       clib_bihash_kv_8_8_t kv0, value0, kv1, value1;
 949       u32 iph_offset0 = 0, iph_offset1 = 0;
 950
 951       b0 = *b;
 952       b++;
 953       b1 = *b;
 954       b++;
 955
 956       /* Prefetch next iteration. */
 957       if (PREDICT_TRUE (n_left_from >= 4))
 958         {
 959           vlib_buffer_t *p2, *p3;
 960
 961           p2 = *b;
 962           p3 = *(b + 1);
 963
 964           vlib_prefetch_buffer_header (p2, LOAD);
 965           vlib_prefetch_buffer_header (p3, LOAD);
 966
 967           clib_prefetch_load (p2->data);
 968           clib_prefetch_load (p3->data);
 969         }
 970
 971       if (is_output_feature)
 972         iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
 973
 974       ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
 975                               iph_offset0);
 976
 977       udp0 = ip4_next_header (ip0);
 978       tcp0 = (tcp_header_t *) udp0;
 979       icmp0 = (icmp46_header_t *) udp0;
 980
 981       rx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 982       tx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
 983       cntr_sw_if_index0 =
 984         is_output_feature ? tx_sw_if_index0 : rx_sw_if_index0;
 985       rx_fib_index0 =
 986         vec_elt (nm->ip4_main->fib_index_by_sw_if_index, rx_sw_if_index0);
 987
 988       next0 = next1 = NAT44_EI_IN2OUT_NEXT_LOOKUP;
 989
 990       if (PREDICT_FALSE (ip0->ttl == 1))
 991         {
 992           vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 993           icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
 994                                        ICMP4_time_exceeded_ttl_exceeded_in_transit,
 995                                        0);
 996           next0 = NAT44_EI_IN2OUT_NEXT_ICMP_ERROR;
 997           goto trace00;
 998         }
 999
1000       proto0 = ip_proto_to_nat_proto (ip0->protocol);
1001
1002       /* Next configured feature, probably ip4-lookup */
1003       if (is_slow_path)
1004         {
1005           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
1006             {
1007               if (nat_in2out_sm_unknown_proto (nm, b0, ip0, rx_fib_index0))
1008                 {
1009                   next0 = NAT44_EI_IN2OUT_NEXT_DROP;
1010                   b0->error =
1011                     node->errors[NAT44_EI_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
1012                 }
1013               vlib_increment_simple_counter (
1014                 is_slow_path ? &nm->counters.slowpath.in2out.other :
1015                                &nm->counters.fastpath.in2out.other,
1016                 thread_index, cntr_sw_if_index0, 1);
1017               goto trace00;
1018             }
1019
1020           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
1021             {
1022               next0 = nat44_ei_icmp_in2out_slow_path (
1023                 nm, b0, ip0, icmp0, rx_sw_if_index0, rx_fib_index0, node,
1024                 next0, now, thread_index, &s0);
1025               vlib_increment_simple_counter (
1026                 is_slow_path ? &nm->counters.slowpath.in2out.icmp :
1027                                &nm->counters.fastpath.in2out.icmp,
1028                 thread_index, cntr_sw_if_index0, 1);
1029               goto trace00;
1030             }
1031         }
1032       else
1033         {
1034           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
1035             {
1036               next0 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH;
1037               goto trace00;
1038             }
1039
1040           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
1041             {
1042               next0 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH;
1043               goto trace00;
1044             }
1045         }
1046
1047       init_nat_k (&kv0, ip0->src_address,
1048                   vnet_buffer (b0)->ip.reass.l4_src_port, rx_fib_index0,
1049                   proto0);
1050       if (PREDICT_FALSE (clib_bihash_search_8_8 (&nm->in2out, &kv0, &value0) !=
1051                          0))
1052         {
1053           if (is_slow_path)
1054             {
1055               if (is_output_feature)
1056                 {
1057                   if (PREDICT_FALSE (nat44_ei_not_translate_output_feature (
1058                         nm, ip0, proto0,
1059                         vnet_buffer (b0)->ip.reass.l4_src_port,
1060                         vnet_buffer (b0)->ip.reass.l4_dst_port, thread_index,
1061                         rx_sw_if_index0)))
1062                     goto trace00;
1063
1064                   /*
1065                    * Send DHCP packets to the ipv4 stack, or we won't
1066                    * be able to use dhcp client on the outside interface
1067                    */
1068                   if (PREDICT_FALSE
1069                       (proto0 == NAT_PROTOCOL_UDP
1070                        && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
1071                            clib_host_to_net_u16
1072                            (UDP_DST_PORT_dhcp_to_server))
1073                        && ip0->dst_address.as_u32 == 0xffffffff))
1074                     goto trace00;
1075                 }
1076               else
1077                 {
1078                   if (PREDICT_FALSE (nat44_ei_not_translate (
1079                         nm, node, rx_sw_if_index0, ip0, proto0, rx_fib_index0,
1080                         thread_index)))
1081                     goto trace00;
1082                 }
1083
1084               next0 = slow_path (nm, b0, ip0, ip0->src_address,
1085                                  vnet_buffer (b0)->ip.reass.l4_src_port,
1086                                  rx_fib_index0, proto0, &s0, node, next0,
1087                                  thread_index, now);
1088               if (PREDICT_FALSE (next0 == NAT44_EI_IN2OUT_NEXT_DROP))
1089                 goto trace00;
1090
1091               if (PREDICT_FALSE (!s0))
1092                 goto trace00;
1093             }
1094           else
1095             {
1096               next0 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH;
1097               goto trace00;
1098             }
1099         }
1100       else
1101         s0 = pool_elt_at_index (nm->per_thread_data[thread_index].sessions,
1102                                 nat_value_get_session_index (&value0));
1103
1104       b0->flags |= VNET_BUFFER_F_IS_NATED;
1105
1106       old_addr0 = ip0->src_address.as_u32;
1107       ip0->src_address = s0->out2in.addr;
1108       new_addr0 = ip0->src_address.as_u32;
1109       if (!is_output_feature)
1110         vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1111
1112       sum0 = ip0->checksum;
1113       sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1114                              ip4_header_t, src_address /* changed member */ );
1115       ip0->checksum = ip_csum_fold (sum0);
1116
1117
1118       if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
1119         {
1120           if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1121             {
1122               old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1123               new_port0 = udp0->src_port = s0->out2in.port;
1124               sum0 = tcp0->checksum;
1125               sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1126                                      ip4_header_t,
1127                                      dst_address /* changed member */ );
1128               sum0 = ip_csum_update (sum0, old_port0, new_port0,
1129                                      ip4_header_t /* cheat */ ,
1130                                      length /* changed member */ );
1131               mss_clamping (nm->mss_clamping, tcp0, &sum0);
1132               tcp0->checksum = ip_csum_fold (sum0);
1133             }
1134           vlib_increment_simple_counter (is_slow_path ?
1135                                            &nm->counters.slowpath.in2out.tcp :
1136                                            &nm->counters.fastpath.in2out.tcp,
1137                                          thread_index, cntr_sw_if_index0, 1);
1138         }
1139       else
1140         {
1141           if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1142             {
1143               udp0->src_port = s0->out2in.port;
1144               if (PREDICT_FALSE (udp0->checksum))
1145                 {
1146                   old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1147                   new_port0 = udp0->src_port;
1148                   sum0 = udp0->checksum;
1149                   sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address  /* changed member */
1150                     );
1151                   sum0 =
1152                     ip_csum_update (sum0, old_port0, new_port0,
1153                                     ip4_header_t /* cheat */ ,
1154                                     length /* changed member */ );
1155                   udp0->checksum = ip_csum_fold (sum0);
1156                 }
1157             }
1158           vlib_increment_simple_counter (is_slow_path ?
1159                                            &nm->counters.slowpath.in2out.udp :
1160                                            &nm->counters.fastpath.in2out.udp,
1161                                          thread_index, cntr_sw_if_index0, 1);
1162         }
1163
1164       /* Accounting */
1165       nat44_ei_session_update_counters (
1166         s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index);
1167       /* Per-user LRU list maintenance */
1168       nat44_ei_session_update_lru (nm, s0, thread_index);
1169     trace00:
1170
1171       if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1172                          && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1173         {
1174           nat44_ei_in2out_trace_t *t =
1175             vlib_add_trace (vm, node, b0, sizeof (*t));
1176           t->is_slow_path = is_slow_path;
1177           t->sw_if_index = rx_sw_if_index0;
1178           t->next_index = next0;
1179           t->session_index = ~0;
1180           if (s0)
1181             t->session_index = s0 - nm->per_thread_data[thread_index].sessions;
1182         }
1183
1184       if (next0 == NAT44_EI_IN2OUT_NEXT_DROP)
1185         {
1186           vlib_increment_simple_counter (
1187             is_slow_path ? &nm->counters.slowpath.in2out.drops :
1188                            &nm->counters.fastpath.in2out.drops,
1189             thread_index, cntr_sw_if_index0, 1);
1190         }
1191
1192       if (is_output_feature)
1193         iph_offset1 = vnet_buffer (b1)->ip.reass.save_rewrite_length;
1194
1195       ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
1196                               iph_offset1);
1197
1198       udp1 = ip4_next_header (ip1);
1199       tcp1 = (tcp_header_t *) udp1;
1200       icmp1 = (icmp46_header_t *) udp1;
1201
1202       rx_sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
1203       tx_sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_TX];
1204       cntr_sw_if_index1 =
1205         is_output_feature ? tx_sw_if_index1 : rx_sw_if_index1;
1206       rx_fib_index1 =
1207         vec_elt (nm->ip4_main->fib_index_by_sw_if_index, rx_sw_if_index1);
1208
1209       if (PREDICT_FALSE (ip1->ttl == 1))
1210         {
1211           vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1212           icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
1213                                        ICMP4_time_exceeded_ttl_exceeded_in_transit,
1214                                        0);
1215           next1 = NAT44_EI_IN2OUT_NEXT_ICMP_ERROR;
1216           goto trace01;
1217         }
1218
1219       proto1 = ip_proto_to_nat_proto (ip1->protocol);
1220
1221       /* Next configured feature, probably ip4-lookup */
1222       if (is_slow_path)
1223         {
1224           if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_OTHER))
1225             {
1226               if (nat_in2out_sm_unknown_proto (nm, b1, ip1, rx_fib_index1))
1227                 {
1228                   next1 = NAT44_EI_IN2OUT_NEXT_DROP;
1229                   b1->error =
1230                     node->errors[NAT44_EI_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
1231                 }
1232               vlib_increment_simple_counter (
1233                 is_slow_path ? &nm->counters.slowpath.in2out.other :
1234                                &nm->counters.fastpath.in2out.other,
1235                 thread_index, cntr_sw_if_index1, 1);
1236               goto trace01;
1237             }
1238
1239           if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP))
1240             {
1241               next1 = nat44_ei_icmp_in2out_slow_path (
1242                 nm, b1, ip1, icmp1, rx_sw_if_index1, rx_fib_index1, node,
1243                 next1, now, thread_index, &s1);
1244               vlib_increment_simple_counter (
1245                 is_slow_path ? &nm->counters.slowpath.in2out.icmp :
1246                                &nm->counters.fastpath.in2out.icmp,
1247                 thread_index, cntr_sw_if_index1, 1);
1248               goto trace01;
1249             }
1250         }
1251       else
1252         {
1253           if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_OTHER))
1254             {
1255               next1 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH;
1256               goto trace01;
1257             }
1258
1259           if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP))
1260             {
1261               next1 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH;
1262               goto trace01;
1263             }
1264         }
1265
1266       init_nat_k (&kv1, ip1->src_address,
1267                   vnet_buffer (b1)->ip.reass.l4_src_port, rx_fib_index1,
1268                   proto1);
1269       if (PREDICT_FALSE (clib_bihash_search_8_8 (&nm->in2out, &kv1, &value1) !=
1270                          0))
1271         {
1272           if (is_slow_path)
1273             {
1274               if (is_output_feature)
1275                 {
1276                   if (PREDICT_FALSE (nat44_ei_not_translate_output_feature (
1277                         nm, ip1, proto1,
1278                         vnet_buffer (b1)->ip.reass.l4_src_port,
1279                         vnet_buffer (b1)->ip.reass.l4_dst_port, thread_index,
1280                         rx_sw_if_index1)))
1281                     goto trace01;
1282
1283                   /*
1284                    * Send DHCP packets to the ipv4 stack, or we won't
1285                    * be able to use dhcp client on the outside interface
1286                    */
1287                   if (PREDICT_FALSE
1288                       (proto1 == NAT_PROTOCOL_UDP
1289                        && (vnet_buffer (b1)->ip.reass.l4_dst_port ==
1290                            clib_host_to_net_u16
1291                            (UDP_DST_PORT_dhcp_to_server))
1292                        && ip1->dst_address.as_u32 == 0xffffffff))
1293                     goto trace01;
1294                 }
1295               else
1296                 {
1297                   if (PREDICT_FALSE (nat44_ei_not_translate (
1298                         nm, node, rx_sw_if_index1, ip1, proto1, rx_fib_index1,
1299                         thread_index)))
1300                     goto trace01;
1301                 }
1302
1303               next1 = slow_path (nm, b1, ip1, ip1->src_address,
1304                                  vnet_buffer (b1)->ip.reass.l4_src_port,
1305                                  rx_fib_index1, proto1, &s1, node, next1,
1306                                  thread_index, now);
1307               if (PREDICT_FALSE (next1 == NAT44_EI_IN2OUT_NEXT_DROP))
1308                 goto trace01;
1309
1310               if (PREDICT_FALSE (!s1))
1311                 goto trace01;
1312             }
1313           else
1314             {
1315               next1 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH;
1316               goto trace01;
1317             }
1318         }
1319       else
1320         s1 = pool_elt_at_index (nm->per_thread_data[thread_index].sessions,
1321                                 nat_value_get_session_index (&value1));
1322
1323       b1->flags |= VNET_BUFFER_F_IS_NATED;
1324
1325       old_addr1 = ip1->src_address.as_u32;
1326       ip1->src_address = s1->out2in.addr;
1327       new_addr1 = ip1->src_address.as_u32;
1328       if (!is_output_feature)
1329         vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
1330
1331       sum1 = ip1->checksum;
1332       sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1333                              ip4_header_t, src_address /* changed member */ );
1334       ip1->checksum = ip_csum_fold (sum1);
1335
1336       if (PREDICT_TRUE (proto1 == NAT_PROTOCOL_TCP))
1337         {
1338           if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment)
1339             {
1340               old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port;
1341               new_port1 = udp1->src_port = s1->out2in.port;
1342               sum1 = tcp1->checksum;
1343               sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1344                                      ip4_header_t,
1345                                      dst_address /* changed member */ );
1346               sum1 = ip_csum_update (sum1, old_port1, new_port1,
1347                                      ip4_header_t /* cheat */ ,
1348                                      length /* changed member */ );
1349               mss_clamping (nm->mss_clamping, tcp1, &sum1);
1350               tcp1->checksum = ip_csum_fold (sum1);
1351             }
1352           vlib_increment_simple_counter (is_slow_path ?
1353                                            &nm->counters.slowpath.in2out.tcp :
1354                                            &nm->counters.fastpath.in2out.tcp,
1355                                          thread_index, cntr_sw_if_index1, 1);
1356         }
1357       else
1358         {
1359           if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment)
1360             {
1361               udp1->src_port = s1->out2in.port;
1362               if (PREDICT_FALSE (udp1->checksum))
1363                 {
1364                   old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port;
1365                   new_port1 = udp1->src_port;
1366                   sum1 = udp1->checksum;
1367                   sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, dst_address  /* changed member */
1368                     );
1369                   sum1 =
1370                     ip_csum_update (sum1, old_port1, new_port1,
1371                                     ip4_header_t /* cheat */ ,
1372                                     length /* changed member */ );
1373                   udp1->checksum = ip_csum_fold (sum1);
1374                 }
1375             }
1376           vlib_increment_simple_counter (is_slow_path ?
1377                                            &nm->counters.slowpath.in2out.udp :
1378                                            &nm->counters.fastpath.in2out.udp,
1379                                          thread_index, cntr_sw_if_index1, 1);
1380         }
1381
1382       /* Accounting */
1383       nat44_ei_session_update_counters (
1384         s1, now, vlib_buffer_length_in_chain (vm, b1), thread_index);
1385       /* Per-user LRU list maintenance */
1386       nat44_ei_session_update_lru (nm, s1, thread_index);
1387     trace01:
1388
1389       if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1390                          && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1391         {
1392           nat44_ei_in2out_trace_t *t =
1393             vlib_add_trace (vm, node, b1, sizeof (*t));
1394           t->sw_if_index = rx_sw_if_index1;
1395           t->next_index = next1;
1396           t->session_index = ~0;
1397           if (s1)
1398             t->session_index = s1 - nm->per_thread_data[thread_index].sessions;
1399         }
1400
1401       if (next1 == NAT44_EI_IN2OUT_NEXT_DROP)
1402         {
1403           vlib_increment_simple_counter (
1404             is_slow_path ? &nm->counters.slowpath.in2out.drops :
1405                            &nm->counters.fastpath.in2out.drops,
1406             thread_index, cntr_sw_if_index1, 1);
1407         }
1408
1409       n_left_from -= 2;
1410       next[0] = next0;
1411       next[1] = next1;
1412       next += 2;
1413     }
1414
1415   while (n_left_from > 0)
1416     {
1417       vlib_buffer_t *b0;
1418       u32 next0;
1419       u32 rx_sw_if_index0;
1420       u32 tx_sw_if_index0;
1421       u32 cntr_sw_if_index0;
1422       ip4_header_t *ip0;
1423       ip_csum_t sum0;
1424       u32 new_addr0, old_addr0;
1425       u16 old_port0, new_port0;
1426       udp_header_t *udp0;
1427       tcp_header_t *tcp0;
1428       icmp46_header_t *icmp0;
1429       u32 rx_fib_index0;
1430       u32 proto0;
1431       nat44_ei_session_t *s0 = 0;
1432       clib_bihash_kv_8_8_t kv0, value0;
1433       u32 iph_offset0 = 0;
1434
1435       b0 = *b;
1436       b++;
1437       next0 = NAT44_EI_IN2OUT_NEXT_LOOKUP;
1438
1439       if (is_output_feature)
1440         iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
1441
1442       ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1443                               iph_offset0);
1444
1445       udp0 = ip4_next_header (ip0);
1446       tcp0 = (tcp_header_t *) udp0;
1447       icmp0 = (icmp46_header_t *) udp0;
1448
1449       rx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1450       tx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
1451       cntr_sw_if_index0 =
1452         is_output_feature ? tx_sw_if_index0 : rx_sw_if_index0;
1453       rx_fib_index0 =
1454         vec_elt (nm->ip4_main->fib_index_by_sw_if_index, rx_sw_if_index0);
1455
1456       if (PREDICT_FALSE (ip0->ttl == 1))
1457         {
1458           vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1459           icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1460                                        ICMP4_time_exceeded_ttl_exceeded_in_transit,
1461                                        0);
1462           next0 = NAT44_EI_IN2OUT_NEXT_ICMP_ERROR;
1463           goto trace0;
1464         }
1465
1466       proto0 = ip_proto_to_nat_proto (ip0->protocol);
1467
1468       /* Next configured feature, probably ip4-lookup */
1469       if (is_slow_path)
1470         {
1471           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
1472             {
1473               if (nat_in2out_sm_unknown_proto (nm, b0, ip0, rx_fib_index0))
1474                 {
1475                   next0 = NAT44_EI_IN2OUT_NEXT_DROP;
1476                   b0->error =
1477                     node->errors[NAT44_EI_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
1478                 }
1479               vlib_increment_simple_counter (
1480                 is_slow_path ? &nm->counters.slowpath.in2out.other :
1481                                &nm->counters.fastpath.in2out.other,
1482                 thread_index, cntr_sw_if_index0, 1);
1483               goto trace0;
1484             }
1485
1486           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
1487             {
1488               next0 = nat44_ei_icmp_in2out_slow_path (
1489                 nm, b0, ip0, icmp0, rx_sw_if_index0, rx_fib_index0, node,
1490                 next0, now, thread_index, &s0);
1491               vlib_increment_simple_counter (
1492                 is_slow_path ? &nm->counters.slowpath.in2out.icmp :
1493                                &nm->counters.fastpath.in2out.icmp,
1494                 thread_index, cntr_sw_if_index0, 1);
1495               goto trace0;
1496             }
1497         }
1498       else
1499         {
1500           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
1501             {
1502               next0 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH;
1503               goto trace0;
1504             }
1505
1506           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
1507             {
1508               next0 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH;
1509               goto trace0;
1510             }
1511         }
1512
1513       init_nat_k (&kv0, ip0->src_address,
1514                   vnet_buffer (b0)->ip.reass.l4_src_port, rx_fib_index0,
1515                   proto0);
1516
1517       if (clib_bihash_search_8_8 (&nm->in2out, &kv0, &value0))
1518         {
1519           if (is_slow_path)
1520             {
1521               if (is_output_feature)
1522                 {
1523                   if (PREDICT_FALSE (nat44_ei_not_translate_output_feature (
1524                         nm, ip0, proto0,
1525                         vnet_buffer (b0)->ip.reass.l4_src_port,
1526                         vnet_buffer (b0)->ip.reass.l4_dst_port, thread_index,
1527                         rx_sw_if_index0)))
1528                     goto trace0;
1529
1530                   /*
1531                    * Send DHCP packets to the ipv4 stack, or we won't
1532                    * be able to use dhcp client on the outside interface
1533                    */
1534                   if (PREDICT_FALSE
1535                       (proto0 == NAT_PROTOCOL_UDP
1536                        && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
1537                            clib_host_to_net_u16
1538                            (UDP_DST_PORT_dhcp_to_server))
1539                        && ip0->dst_address.as_u32 == 0xffffffff))
1540                     goto trace0;
1541                 }
1542               else
1543                 {
1544                   if (PREDICT_FALSE (nat44_ei_not_translate (
1545                         nm, node, rx_sw_if_index0, ip0, proto0, rx_fib_index0,
1546                         thread_index)))
1547                     goto trace0;
1548                 }
1549
1550               next0 = slow_path (nm, b0, ip0, ip0->src_address,
1551                                  vnet_buffer (b0)->ip.reass.l4_src_port,
1552                                  rx_fib_index0, proto0, &s0, node, next0,
1553                                  thread_index, now);
1554
1555               if (PREDICT_FALSE (next0 == NAT44_EI_IN2OUT_NEXT_DROP))
1556                 goto trace0;
1557
1558               if (PREDICT_FALSE (!s0))
1559                 goto trace0;
1560             }
1561           else
1562             {
1563               next0 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH;
1564               goto trace0;
1565             }
1566         }
1567       else
1568         s0 = pool_elt_at_index (nm->per_thread_data[thread_index].sessions,
1569                                 nat_value_get_session_index (&value0));
1570
1571       b0->flags |= VNET_BUFFER_F_IS_NATED;
1572
1573       old_addr0 = ip0->src_address.as_u32;
1574       ip0->src_address = s0->out2in.addr;
1575       new_addr0 = ip0->src_address.as_u32;
1576       if (!is_output_feature)
1577         vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1578
1579       sum0 = ip0->checksum;
1580       sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1581                              ip4_header_t, src_address /* changed member */ );
1582       ip0->checksum = ip_csum_fold (sum0);
1583
1584       if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
1585         {
1586           if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1587             {
1588               old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1589               new_port0 = udp0->src_port = s0->out2in.port;
1590               sum0 = tcp0->checksum;
1591               sum0 =
1592                 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1593                                 dst_address /* changed member */ );
1594               sum0 =
1595                 ip_csum_update (sum0, old_port0, new_port0,
1596                                 ip4_header_t /* cheat */ ,
1597                                 length /* changed member */ );
1598               mss_clamping (nm->mss_clamping, tcp0, &sum0);
1599               tcp0->checksum = ip_csum_fold (sum0);
1600             }
1601           vlib_increment_simple_counter (is_slow_path ?
1602                                            &nm->counters.slowpath.in2out.tcp :
1603                                            &nm->counters.fastpath.in2out.tcp,
1604                                          thread_index, cntr_sw_if_index0, 1);
1605         }
1606       else
1607         {
1608           if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1609             {
1610               udp0->src_port = s0->out2in.port;
1611               if (PREDICT_FALSE (udp0->checksum))
1612                 {
1613                   old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1614                   new_port0 = udp0->src_port;
1615                   sum0 = udp0->checksum;
1616                   sum0 =
1617                     ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1618                                     dst_address /* changed member */ );
1619                   sum0 =
1620                     ip_csum_update (sum0, old_port0, new_port0,
1621                                     ip4_header_t /* cheat */ ,
1622                                     length /* changed member */ );
1623                   udp0->checksum = ip_csum_fold (sum0);
1624                 }
1625             }
1626           vlib_increment_simple_counter (is_slow_path ?
1627                                            &nm->counters.slowpath.in2out.udp :
1628                                            &nm->counters.fastpath.in2out.udp,
1629                                          thread_index, cntr_sw_if_index0, 1);
1630         }
1631
1632       /* Accounting */
1633       nat44_ei_session_update_counters (
1634         s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index);
1635       /* Per-user LRU list maintenance */
1636       nat44_ei_session_update_lru (nm, s0, thread_index);
1637
1638     trace0:
1639       if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1640                          && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1641         {
1642           nat44_ei_in2out_trace_t *t =
1643             vlib_add_trace (vm, node, b0, sizeof (*t));
1644           t->is_slow_path = is_slow_path;
1645           t->sw_if_index = rx_sw_if_index0;
1646           t->next_index = next0;
1647           t->session_index = ~0;
1648           if (s0)
1649             t->session_index = s0 - nm->per_thread_data[thread_index].sessions;
1650         }
1651
1652       if (next0 == NAT44_EI_IN2OUT_NEXT_DROP)
1653         {
1654           vlib_increment_simple_counter (
1655             is_slow_path ? &nm->counters.slowpath.in2out.drops :
1656                            &nm->counters.fastpath.in2out.drops,
1657             thread_index, cntr_sw_if_index0, 1);
1658         }
1659
1660       n_left_from--;
1661       next[0] = next0;
1662       next++;
1663     }
1664
1665   vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
1666                                frame->n_vectors);
1667   return frame->n_vectors;
1668 }
1669
1670 VLIB_NODE_FN (nat44_ei_in2out_node)
1671 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1672 {
1673   return nat44_ei_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */,
1674                                          0);
1675 }
1676
1677 VLIB_REGISTER_NODE (nat44_ei_in2out_node) = {
1678   .name = "nat44-ei-in2out",
1679   .vector_size = sizeof (u32),
1680   .format_trace = format_nat44_ei_in2out_trace,
1681   .type = VLIB_NODE_TYPE_INTERNAL,
1682
1683   .n_errors = ARRAY_LEN(nat44_ei_in2out_error_strings),
1684   .error_strings = nat44_ei_in2out_error_strings,
1685
1686   .runtime_data_bytes = sizeof (nat44_ei_runtime_t),
1687
1688   .n_next_nodes = NAT44_EI_IN2OUT_N_NEXT,
1689
1690   /* edit / add dispositions here */
1691   .next_nodes = {
1692     [NAT44_EI_IN2OUT_NEXT_DROP] = "error-drop",
1693     [NAT44_EI_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1694     [NAT44_EI_IN2OUT_NEXT_SLOW_PATH] = "nat44-ei-in2out-slowpath",
1695     [NAT44_EI_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1696     [NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF] = "nat44-ei-in2out-hairpinning-handoff-ip4-lookup",
1697   },
1698 };
1699
1700 VLIB_NODE_FN (nat44_ei_in2out_output_node)
1701 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1702 {
1703   return nat44_ei_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */,
1704                                          1);
1705 }
1706
1707 VLIB_REGISTER_NODE (nat44_ei_in2out_output_node) = {
1708   .name = "nat44-ei-in2out-output",
1709   .vector_size = sizeof (u32),
1710   .format_trace = format_nat44_ei_in2out_trace,
1711   .type = VLIB_NODE_TYPE_INTERNAL,
1712
1713   .n_errors = ARRAY_LEN(nat44_ei_in2out_error_strings),
1714   .error_strings = nat44_ei_in2out_error_strings,
1715
1716   .runtime_data_bytes = sizeof (nat44_ei_runtime_t),
1717
1718   .n_next_nodes = NAT44_EI_IN2OUT_N_NEXT,
1719
1720   /* edit / add dispositions here */
1721   .next_nodes = {
1722     [NAT44_EI_IN2OUT_NEXT_DROP] = "error-drop",
1723     [NAT44_EI_IN2OUT_NEXT_LOOKUP] = "interface-output",
1724     [NAT44_EI_IN2OUT_NEXT_SLOW_PATH] = "nat44-ei-in2out-output-slowpath",
1725     [NAT44_EI_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1726     [NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF] = "nat44-ei-in2out-hairpinning-handoff-interface-output",
1727   },
1728 };
1729
1730 VLIB_NODE_FN (nat44_ei_in2out_slowpath_node)
1731 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1732 {
1733   return nat44_ei_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */,
1734                                          0);
1735 }
1736
1737 VLIB_REGISTER_NODE (nat44_ei_in2out_slowpath_node) = {
1738   .name = "nat44-ei-in2out-slowpath",
1739   .vector_size = sizeof (u32),
1740   .format_trace = format_nat44_ei_in2out_trace,
1741   .type = VLIB_NODE_TYPE_INTERNAL,
1742
1743   .n_errors = ARRAY_LEN(nat44_ei_in2out_error_strings),
1744   .error_strings = nat44_ei_in2out_error_strings,
1745
1746   .runtime_data_bytes = sizeof (nat44_ei_runtime_t),
1747
1748   .n_next_nodes = NAT44_EI_IN2OUT_N_NEXT,
1749
1750   /* edit / add dispositions here */
1751   .next_nodes = {
1752     [NAT44_EI_IN2OUT_NEXT_DROP] = "error-drop",
1753     [NAT44_EI_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1754     [NAT44_EI_IN2OUT_NEXT_SLOW_PATH] = "nat44-ei-in2out-slowpath",
1755     [NAT44_EI_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1756     [NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF] = "nat44-ei-in2out-hairpinning-handoff-ip4-lookup",
1757   },
1758 };
1759
1760 VLIB_NODE_FN (nat44_ei_in2out_output_slowpath_node)
1761 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1762 {
1763   return nat44_ei_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */,
1764                                          1);
1765 }
1766
1767 VLIB_REGISTER_NODE (nat44_ei_in2out_output_slowpath_node) = {
1768   .name = "nat44-ei-in2out-output-slowpath",
1769   .vector_size = sizeof (u32),
1770   .format_trace = format_nat44_ei_in2out_trace,
1771   .type = VLIB_NODE_TYPE_INTERNAL,
1772
1773   .n_errors = ARRAY_LEN(nat44_ei_in2out_error_strings),
1774   .error_strings = nat44_ei_in2out_error_strings,
1775
1776   .runtime_data_bytes = sizeof (nat44_ei_runtime_t),
1777
1778   .n_next_nodes = NAT44_EI_IN2OUT_N_NEXT,
1779
1780   /* edit / add dispositions here */
1781   .next_nodes = {
1782     [NAT44_EI_IN2OUT_NEXT_DROP] = "error-drop",
1783     [NAT44_EI_IN2OUT_NEXT_LOOKUP] = "interface-output",
1784     [NAT44_EI_IN2OUT_NEXT_SLOW_PATH] = "nat44-ei-in2out-output-slowpath",
1785     [NAT44_EI_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1786     [NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF] = "nat44-ei-in2out-hairpinning-handoff-interface-output",
1787   },
1788 };
1789
1790 VLIB_NODE_FN (nat44_ei_in2out_fast_node)
1791 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1792 {
1793   u32 n_left_from, *from, *to_next;
1794   u32 thread_index = vm->thread_index;
1795   nat44_ei_in2out_next_t next_index;
1796   nat44_ei_main_t *nm = &nat44_ei_main;
1797   int is_hairpinning = 0;
1798
1799   from = vlib_frame_vector_args (frame);
1800   n_left_from = frame->n_vectors;
1801   next_index = node->cached_next_index;
1802
1803   while (n_left_from > 0)
1804     {
1805       u32 n_left_to_next;
1806
1807       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1808
1809       while (n_left_from > 0 && n_left_to_next > 0)
1810         {
1811           u32 bi0;
1812           vlib_buffer_t *b0;
1813           u32 next0;
1814           u32 sw_if_index0;
1815           ip4_header_t *ip0;
1816           ip_csum_t sum0;
1817           u32 new_addr0, old_addr0;
1818           u16 old_port0, new_port0;
1819           udp_header_t *udp0;
1820           tcp_header_t *tcp0;
1821           icmp46_header_t *icmp0;
1822           u32 proto0;
1823           u32 rx_fib_index0;
1824           ip4_address_t sm0_addr;
1825           u16 sm0_port;
1826           u32 sm0_fib_index;
1827           u32 required_thread_index = thread_index;
1828
1829           /* speculatively enqueue b0 to the current next frame */
1830           bi0 = from[0];
1831           to_next[0] = bi0;
1832           from += 1;
1833           to_next += 1;
1834           n_left_from -= 1;
1835           n_left_to_next -= 1;
1836
1837           b0 = vlib_get_buffer (vm, bi0);
1838           next0 = NAT44_EI_IN2OUT_NEXT_LOOKUP;
1839
1840           ip0 = vlib_buffer_get_current (b0);
1841           udp0 = ip4_next_header (ip0);
1842           tcp0 = (tcp_header_t *) udp0;
1843           icmp0 = (icmp46_header_t *) udp0;
1844
1845           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1846           rx_fib_index0 =
1847             ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1848
1849           if (PREDICT_FALSE (ip0->ttl == 1))
1850             {
1851               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1852               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1853                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
1854                                            0);
1855               next0 = NAT44_EI_IN2OUT_NEXT_ICMP_ERROR;
1856               goto trace0;
1857             }
1858
1859           proto0 = ip_proto_to_nat_proto (ip0->protocol);
1860
1861           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
1862             goto trace0;
1863
1864           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
1865             {
1866               next0 = nat44_ei_icmp_in2out (b0, ip0, icmp0, sw_if_index0,
1867                                             rx_fib_index0, node, next0, ~0, 0);
1868               goto trace0;
1869             }
1870
1871           if (nat44_ei_static_mapping_match (
1872                 ip0->src_address, udp0->src_port, rx_fib_index0, proto0,
1873                 &sm0_addr, &sm0_port, &sm0_fib_index, 0, 0, 0))
1874             {
1875               b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_NO_TRANSLATION];
1876               next0 = NAT44_EI_IN2OUT_NEXT_DROP;
1877               goto trace0;
1878             }
1879
1880           new_addr0 = sm0_addr.as_u32;
1881           new_port0 = sm0_port;
1882           vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0_fib_index;
1883           old_addr0 = ip0->src_address.as_u32;
1884           ip0->src_address.as_u32 = new_addr0;
1885
1886           sum0 = ip0->checksum;
1887           sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1888                                  ip4_header_t,
1889                                  src_address /* changed member */ );
1890           ip0->checksum = ip_csum_fold (sum0);
1891
1892           if (PREDICT_FALSE (new_port0 != udp0->dst_port))
1893             {
1894               old_port0 = udp0->src_port;
1895               udp0->src_port = new_port0;
1896
1897               if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
1898                 {
1899                   sum0 = tcp0->checksum;
1900                   sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1901                                          ip4_header_t,
1902                                          dst_address /* changed member */ );
1903                   sum0 = ip_csum_update (sum0, old_port0, new_port0,
1904                                          ip4_header_t /* cheat */ ,
1905                                          length /* changed member */ );
1906                   mss_clamping (nm->mss_clamping, tcp0, &sum0);
1907                   tcp0->checksum = ip_csum_fold (sum0);
1908                 }
1909               else if (udp0->checksum)
1910                 {
1911                   sum0 = udp0->checksum;
1912                   sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1913                                          ip4_header_t,
1914                                          dst_address /* changed member */ );
1915                   sum0 = ip_csum_update (sum0, old_port0, new_port0,
1916                                          ip4_header_t /* cheat */ ,
1917                                          length /* changed member */ );
1918                   udp0->checksum = ip_csum_fold (sum0);
1919                 }
1920             }
1921           else
1922             {
1923               if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
1924                 {
1925                   sum0 = tcp0->checksum;
1926                   sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1927                                          ip4_header_t,
1928                                          dst_address /* changed member */ );
1929                   mss_clamping (nm->mss_clamping, tcp0, &sum0);
1930                   tcp0->checksum = ip_csum_fold (sum0);
1931                 }
1932               else if (udp0->checksum)
1933                 {
1934                   sum0 = udp0->checksum;
1935                   sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1936                                          ip4_header_t,
1937                                          dst_address /* changed member */ );
1938                   udp0->checksum = ip_csum_fold (sum0);
1939                 }
1940             }
1941
1942           /* Hairpinning */
1943           is_hairpinning = nat44_ei_hairpinning (
1944             vm, node, nm, thread_index, b0, ip0, udp0, tcp0, proto0,
1945             0 /* do_trace */, &required_thread_index);
1946
1947           if (thread_index != required_thread_index)
1948             {
1949               vnet_buffer (b0)->snat.required_thread_index =
1950                 required_thread_index;
1951               next0 = NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF;
1952             }
1953
1954         trace0:
1955           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1956                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1957             {
1958               nat44_ei_in2out_trace_t *t =
1959                 vlib_add_trace (vm, node, b0, sizeof (*t));
1960               t->sw_if_index = sw_if_index0;
1961               t->next_index = next0;
1962               t->is_hairpinning = is_hairpinning;
1963             }
1964
1965           if (next0 != NAT44_EI_IN2OUT_NEXT_DROP)
1966             {
1967
1968               vlib_increment_simple_counter (
1969                 &nm->counters.fastpath.in2out.other, sw_if_index0,
1970                 vm->thread_index, 1);
1971             }
1972
1973           /* verify speculative enqueue, maybe switch current next frame */
1974           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1975                                            to_next, n_left_to_next,
1976                                            bi0, next0);
1977         }
1978
1979       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1980     }
1981
1982   return frame->n_vectors;
1983 }
1984
1985 VLIB_REGISTER_NODE (nat44_ei_in2out_fast_node) = {
1986   .name = "nat44-ei-in2out-fast",
1987   .vector_size = sizeof (u32),
1988   .format_trace = format_nat44_ei_in2out_fast_trace,
1989   .type = VLIB_NODE_TYPE_INTERNAL,
1990
1991   .n_errors = ARRAY_LEN(nat44_ei_in2out_error_strings),
1992   .error_strings = nat44_ei_in2out_error_strings,
1993
1994   .runtime_data_bytes = sizeof (nat44_ei_runtime_t),
1995
1996   .n_next_nodes = NAT44_EI_IN2OUT_N_NEXT,
1997
1998   /* edit / add dispositions here */
1999   .next_nodes = {
2000     [NAT44_EI_IN2OUT_NEXT_DROP] = "error-drop",
2001     [NAT44_EI_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
2002     [NAT44_EI_IN2OUT_NEXT_SLOW_PATH] = "nat44-ei-in2out-slowpath",
2003     [NAT44_EI_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2004     [NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF] = "nat44-ei-in2out-hairpinning-handoff-ip4-lookup",
2005   },
2006 };
2007
2008 VLIB_NODE_FN (nat44_ei_in2out_hairpinning_handoff_ip4_lookup_node)
2009 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
2010 {
2011   return nat44_ei_hairpinning_handoff_fn_inline (
2012     vm, node, frame,
2013     nat44_ei_main.in2out_hairpinning_finish_ip4_lookup_node_fq_index);
2014 }
2015
2016 VLIB_REGISTER_NODE (nat44_ei_in2out_hairpinning_handoff_ip4_lookup_node) = {
2017   .name = "nat44-ei-in2out-hairpinning-handoff-ip4-lookup",
2018   .vector_size = sizeof (u32),
2019   .n_errors = ARRAY_LEN(nat44_ei_hairpinning_handoff_error_strings),
2020   .error_strings = nat44_ei_hairpinning_handoff_error_strings,
2021   .format_trace = format_nat44_ei_hairpinning_handoff_trace,
2022
2023   .n_next_nodes = 1,
2024
2025   .next_nodes = {
2026     [0] = "error-drop",
2027   },
2028 };
2029
2030 VLIB_NODE_FN (nat44_ei_in2out_hairpinning_handoff_interface_output_node)
2031 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
2032 {
2033   return nat44_ei_hairpinning_handoff_fn_inline (
2034     vm, node, frame,
2035     nat44_ei_main.in2out_hairpinning_finish_interface_output_node_fq_index);
2036 }
2037
2038 VLIB_REGISTER_NODE (nat44_ei_in2out_hairpinning_handoff_interface_output_node) = {
2039   .name = "nat44-ei-in2out-hairpinning-handoff-interface-output",
2040   .vector_size = sizeof (u32),
2041   .n_errors = ARRAY_LEN(nat44_ei_hairpinning_handoff_error_strings),
2042   .error_strings = nat44_ei_hairpinning_handoff_error_strings,
2043   .format_trace = format_nat44_ei_hairpinning_handoff_trace,
2044
2045   .n_next_nodes = 1,
2046
2047   .next_nodes = {
2048     [0] = "error-drop",
2049   },
2050 };
2051
2052 static_always_inline int
2053 nat44_ei_in2out_hairpinning_finish_inline (vlib_main_t *vm,
2054                                            vlib_node_runtime_t *node,
2055                                            vlib_frame_t *frame)
2056 {
2057   u32 n_left_from, *from, *to_next;
2058   u32 thread_index = vm->thread_index;
2059   nat44_ei_in2out_next_t next_index;
2060   nat44_ei_main_t *nm = &nat44_ei_main;
2061   int is_hairpinning = 0;
2062
2063   from = vlib_frame_vector_args (frame);
2064   n_left_from = frame->n_vectors;
2065   next_index = node->cached_next_index;
2066
2067   while (n_left_from > 0)
2068     {
2069       u32 n_left_to_next;
2070
2071       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2072
2073       while (n_left_from > 0 && n_left_to_next > 0)
2074         {
2075           u32 bi0;
2076           vlib_buffer_t *b0;
2077           u32 next0;
2078           u32 sw_if_index0;
2079           ip4_header_t *ip0;
2080           udp_header_t *udp0;
2081           tcp_header_t *tcp0;
2082           icmp46_header_t *icmp0;
2083           u32 proto0;
2084           u32 required_thread_index = thread_index;
2085
2086           /* speculatively enqueue b0 to the current next frame */
2087           bi0 = from[0];
2088           to_next[0] = bi0;
2089           from += 1;
2090           to_next += 1;
2091           n_left_from -= 1;
2092           n_left_to_next -= 1;
2093
2094           b0 = vlib_get_buffer (vm, bi0);
2095           next0 = NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_LOOKUP;
2096
2097           ip0 = vlib_buffer_get_current (b0);
2098           udp0 = ip4_next_header (ip0);
2099           tcp0 = (tcp_header_t *) udp0;
2100           icmp0 = (icmp46_header_t *) udp0;
2101
2102           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
2103           proto0 = ip_proto_to_nat_proto (ip0->protocol);
2104
2105           switch (proto0)
2106             {
2107             case NAT_PROTOCOL_TCP:
2108               // fallthrough
2109             case NAT_PROTOCOL_UDP:
2110               is_hairpinning = nat44_ei_hairpinning (
2111                 vm, node, nm, thread_index, b0, ip0, udp0, tcp0, proto0,
2112                 0 /* do_trace */, &required_thread_index);
2113               break;
2114             case NAT_PROTOCOL_ICMP:
2115               is_hairpinning = (0 == nat44_ei_icmp_hairpinning (
2116                                        nm, b0, thread_index, ip0, icmp0,
2117                                        &required_thread_index));
2118               break;
2119             case NAT_PROTOCOL_OTHER:
2120               // this should never happen
2121               next0 = NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_DROP;
2122               break;
2123             }
2124
2125           if (thread_index != required_thread_index)
2126             {
2127               // but we already did a handoff ...
2128               next0 = NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_DROP;
2129             }
2130
2131           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
2132                              (b0->flags & VLIB_BUFFER_IS_TRACED)))
2133             {
2134               nat44_ei_in2out_trace_t *t =
2135                 vlib_add_trace (vm, node, b0, sizeof (*t));
2136               t->sw_if_index = sw_if_index0;
2137               t->next_index = next0;
2138               t->is_hairpinning = is_hairpinning;
2139             }
2140
2141           if (next0 != NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_DROP)
2142             {
2143               vlib_increment_simple_counter (
2144                 &nm->counters.fastpath.in2out.other, sw_if_index0,
2145                 vm->thread_index, 1);
2146             }
2147
2148           /* verify speculative enqueue, maybe switch current next frame */
2149           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
2150                                            n_left_to_next, bi0, next0);
2151         }
2152
2153       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2154     }
2155
2156   return frame->n_vectors;
2157 }
2158
2159 VLIB_NODE_FN (nat44_ei_in2out_hairpinning_finish_ip4_lookup_node)
2160 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
2161 {
2162   return nat44_ei_in2out_hairpinning_finish_inline (vm, node, frame);
2163 }
2164
2165 VLIB_REGISTER_NODE (nat44_ei_in2out_hairpinning_finish_ip4_lookup_node) = {
2166   .name = "nat44-ei-in2out-hairpinning-finish-ip4-lookup",
2167   .vector_size = sizeof (u32),
2168   .format_trace = format_nat44_ei_in2out_fast_trace,
2169   .type = VLIB_NODE_TYPE_INTERNAL,
2170
2171   .n_errors = ARRAY_LEN(nat44_ei_in2out_error_strings),
2172   .error_strings = nat44_ei_in2out_error_strings,
2173
2174   .runtime_data_bytes = sizeof (nat44_ei_runtime_t),
2175
2176   .n_next_nodes = NAT44_EI_IN2OUT_HAIRPINNING_FINISH_N_NEXT,
2177
2178   /* edit / add dispositions here */
2179   .next_nodes = {
2180     [NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_DROP] = "error-drop",
2181     [NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_LOOKUP] = "ip4-lookup",
2182   },
2183 };
2184
2185 VLIB_NODE_FN (nat44_ei_in2out_hairpinning_finish_interface_output_node)
2186 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
2187 {
2188   return nat44_ei_in2out_hairpinning_finish_inline (vm, node, frame);
2189 }
2190
2191 VLIB_REGISTER_NODE (nat44_ei_in2out_hairpinning_finish_interface_output_node) = {
2192   .name = "nat44-ei-in2out-hairpinning-finish-interface-output",
2193   .vector_size = sizeof (u32),
2194   .format_trace = format_nat44_ei_in2out_fast_trace,
2195   .type = VLIB_NODE_TYPE_INTERNAL,
2196
2197   .n_errors = ARRAY_LEN(nat44_ei_in2out_error_strings),
2198   .error_strings = nat44_ei_in2out_error_strings,
2199
2200   .runtime_data_bytes = sizeof (nat44_ei_runtime_t),
2201
2202   .n_next_nodes = NAT44_EI_IN2OUT_HAIRPINNING_FINISH_N_NEXT,
2203
2204   /* edit / add dispositions here */
2205   .next_nodes = {
2206     [NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_DROP] = "error-drop",
2207     [NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_LOOKUP] = "interface-output",
2208   },
2209 };
2210
2211 /*
2212  * fd.io coding-style-patch-verification: ON
2213  *
2214  * Local Variables:
2215  * eval: (c-set-style "gnu")
2216  * End:
2217  */