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_reass.h>
  31 #include <nat/nat_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               tcp_header_t * tcp)
 193 {
 194   snat_session_t *s = 0;
 195   snat_user_t *u;
 196   snat_session_key_t key0, key1;
 197   lb_nat_type_t lb = 0, is_sm = 0;
 198   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 199   nat_ed_ses_key_t *key = (nat_ed_ses_key_t *) kv->key;
 200   u32 proto = ip_proto_to_snat_proto (key->proto);
 201   nat_outside_fib_t *outside_fib;
 202   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
 203   u8 identity_nat;
 204   fib_prefix_t pfx = {
 205     .fp_proto = FIB_PROTOCOL_IP4,
 206     .fp_len = 32,
 207     .fp_addr = {
 208                 .ip4.as_u32 = key->r_addr.as_u32,
 209                 },
 210   };
 211   nat44_is_idle_session_ctx_t ctx;
 212
 213   if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
 214     {
 215       b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
 216       nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
 217       nat_elog_notice ("maximum sessions exceeded");
 218       return NAT_NEXT_DROP;
 219     }
 220
 221   key0.addr = key->l_addr;
 222   key0.port = key->l_port;
 223   key1.protocol = key0.protocol = proto;
 224   key0.fib_index = rx_fib_index;
 225   key1.fib_index = sm->outside_fib_index;
 226   /* First try to match static mapping by local address and port */
 227   if (snat_static_mapping_match
 228       (sm, key0, &key1, 0, 0, 0, &lb, 0, &identity_nat))
 229     {
 230       /* Try to create dynamic translation */
 231       if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index,
 232                                                thread_index, &key1,
 233                                                sm->port_per_thread,
 234                                                tsm->snat_thread_index))
 235         {
 236           nat_elog_notice ("addresses exhausted");
 237           b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS];
 238           return NAT_NEXT_DROP;
 239         }
 240     }
 241   else
 242     {
 243       if (PREDICT_FALSE (identity_nat))
 244         {
 245           *sessionp = s;
 246           return next;
 247         }
 248
 249       is_sm = 1;
 250     }
 251
 252   if (proto == SNAT_PROTOCOL_TCP)
 253     {
 254       if (!tcp_is_init (tcp))
 255         {
 256           b->error = node->errors[NAT_IN2OUT_ED_ERROR_NON_SYN];
 257           return NAT_NEXT_DROP;
 258         }
 259     }
 260
 261   u = nat_user_get_or_create (sm, &key->l_addr, rx_fib_index, thread_index);
 262   if (!u)
 263     {
 264       nat_elog_warn ("create NAT user failed");
 265       if (!is_sm)
 266         snat_free_outside_address_and_port (sm->addresses,
 267                                             thread_index, &key1);
 268       return NAT_NEXT_DROP;
 269     }
 270
 271   s = nat_ed_session_alloc (sm, u, thread_index, now);
 272   if (!s)
 273     {
 274       nat44_delete_user_with_no_session (sm, u, thread_index);
 275       nat_elog_warn ("create NAT session failed");
 276       if (!is_sm)
 277         snat_free_outside_address_and_port (sm->addresses,
 278                                             thread_index, &key1);
 279       return NAT_NEXT_DROP;
 280     }
 281
 282   user_session_increment (sm, u, is_sm);
 283   if (is_sm)
 284     s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
 285   if (lb)
 286     s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
 287   s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
 288   s->ext_host_addr = key->r_addr;
 289   s->ext_host_port = key->r_port;
 290   s->in2out = key0;
 291   s->out2in = key1;
 292   s->out2in.protocol = key0.protocol;
 293
 294   switch (vec_len (sm->outside_fibs))
 295     {
 296     case 0:
 297       s->out2in.fib_index = sm->outside_fib_index;
 298       break;
 299     case 1:
 300       s->out2in.fib_index = sm->outside_fibs[0].fib_index;
 301       break;
 302     default:
 303       /* *INDENT-OFF* */
 304       vec_foreach (outside_fib, sm->outside_fibs)
 305        {
 306           fei = fib_table_lookup (outside_fib->fib_index, &pfx);
 307           if (FIB_NODE_INDEX_INVALID != fei)
 308             {
 309               if (fib_entry_get_resolving_interface (fei) != ~0)
 310                 {
 311                   s->out2in.fib_index = outside_fib->fib_index;
 312                   break;
 313                 }
 314             }
 315         }
 316       /* *INDENT-ON* */
 317       break;
 318     }
 319
 320   /* Add to lookup tables */
 321   kv->value = s - tsm->sessions;
 322   ctx.now = now;
 323   ctx.thread_index = thread_index;
 324   if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, kv,
 325                                                nat44_i2o_ed_is_idle_session_cb,
 326                                                &ctx))
 327     nat_elog_notice ("in2out-ed key add failed");
 328
 329   make_ed_kv (kv, &key1.addr, &key->r_addr, key->proto, s->out2in.fib_index,
 330               key1.port, key->r_port);
 331   kv->value = s - tsm->sessions;
 332   if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, kv,
 333                                                nat44_o2i_ed_is_idle_session_cb,
 334                                                &ctx))
 335     nat_elog_notice ("out2in-ed key add failed");
 336
 337   *sessionp = s;
 338
 339   /* log NAT event */
 340   snat_ipfix_logging_nat44_ses_create (thread_index,
 341                                        s->in2out.addr.as_u32,
 342                                        s->out2in.addr.as_u32,
 343                                        s->in2out.protocol,
 344                                        s->in2out.port,
 345                                        s->out2in.port, s->in2out.fib_index);
 346
 347   nat_syslog_nat44_sadd (s->user_index, s->in2out.fib_index,
 348                          &s->in2out.addr, s->in2out.port,
 349                          &s->ext_host_nat_addr, s->ext_host_nat_port,
 350                          &s->out2in.addr, s->out2in.port,
 351                          &s->ext_host_addr, s->ext_host_port,
 352                          s->in2out.protocol, 0);
 353
 354   nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
 355                s->out2in.port, &s->ext_host_addr, s->ext_host_port,
 356                &s->ext_host_nat_addr, s->ext_host_nat_port,
 357                s->in2out.protocol, s->in2out.fib_index, s->flags,
 358                thread_index, 0);
 359
 360   return next;
 361 }
 362
 363 static_always_inline int
 364 nat44_ed_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
 365                         u32 sw_if_index, ip4_header_t * ip, u32 proto,
 366                         u32 rx_fib_index, u32 thread_index)
 367 {
 368   udp_header_t *udp = ip4_next_header (ip);
 369   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 370   clib_bihash_kv_16_8_t kv, value;
 371   snat_session_key_t key0, key1;
 372
 373   make_ed_kv (&kv, &ip->dst_address, &ip->src_address, ip->protocol,
 374               sm->outside_fib_index, udp->dst_port, udp->src_port);
 375
 376   /* NAT packet aimed at external address if */
 377   /* has active sessions */
 378   if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
 379     {
 380       key0.addr = ip->dst_address;
 381       key0.port = udp->dst_port;
 382       key0.protocol = proto;
 383       key0.fib_index = sm->outside_fib_index;
 384       /* or is static mappings */
 385       if (!snat_static_mapping_match (sm, key0, &key1, 1, 0, 0, 0, 0, 0))
 386         return 0;
 387     }
 388   else
 389     return 0;
 390
 391   if (sm->forwarding_enabled)
 392     return 1;
 393
 394   return snat_not_translate_fast (sm, node, sw_if_index, ip, proto,
 395                                   rx_fib_index);
 396 }
 397
 398 static_always_inline int
 399 nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip,
 400                                       u32 thread_index, f64 now,
 401                                       vlib_main_t * vm, vlib_buffer_t * b)
 402 {
 403   nat_ed_ses_key_t key;
 404   clib_bihash_kv_16_8_t kv, value;
 405   udp_header_t *udp;
 406   snat_session_t *s = 0;
 407   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 408
 409   if (!sm->forwarding_enabled)
 410     return 0;
 411
 412   if (ip->protocol == IP_PROTOCOL_ICMP)
 413     {
 414       key.as_u64[0] = key.as_u64[1] = 0;
 415       if (get_icmp_i2o_ed_key (ip, &key))
 416         return 0;
 417       key.fib_index = 0;
 418       kv.key[0] = key.as_u64[0];
 419       kv.key[1] = key.as_u64[1];
 420     }
 421   else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
 422     {
 423       udp = ip4_next_header (ip);
 424       make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0,
 425                   udp->src_port, udp->dst_port);
 426     }
 427   else
 428     {
 429       make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0, 0,
 430                   0);
 431     }
 432
 433   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 434     {
 435       s = pool_elt_at_index (tsm->sessions, value.value);
 436       if (is_fwd_bypass_session (s))
 437         {
 438           if (ip->protocol == IP_PROTOCOL_TCP)
 439             {
 440               tcp_header_t *tcp = ip4_next_header (ip);
 441               if (nat44_set_tcp_session_state_i2o (sm, s, tcp, 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   icmp46_header_t *icmp;
 519   u32 sw_if_index;
 520   u32 rx_fib_index;
 521   nat_ed_ses_key_t key;
 522   snat_session_t *s = 0;
 523   u8 dont_translate = 0;
 524   clib_bihash_kv_16_8_t kv, value;
 525   u32 next = ~0;
 526   int err;
 527   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 528
 529   icmp = (icmp46_header_t *) ip4_next_header (ip);
 530   sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
 531   rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
 532
 533   key.as_u64[0] = key.as_u64[1] = 0;
 534   err = get_icmp_i2o_ed_key (ip, &key);
 535   if (err != 0)
 536     {
 537       b->error = node->errors[err];
 538       next = NAT_NEXT_DROP;
 539       goto out;
 540     }
 541   key.fib_index = rx_fib_index;
 542
 543   kv.key[0] = key.as_u64[0];
 544   kv.key[1] = key.as_u64[1];
 545
 546   if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 547     {
 548       if (vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0)
 549         {
 550           if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (sm, ip,
 551                                                                     key.proto,
 552                                                                     key.
 553                                                                     l_port,
 554                                                                     key.
 555                                                                     r_port,
 556                                                                     thread_index,
 557                                                                     sw_if_index,
 558                                                                     vnet_buffer
 559                                                                     (b)->
 560                                                                     sw_if_index
 561                                                                     [VLIB_TX])))
 562             {
 563               dont_translate = 1;
 564               goto out;
 565             }
 566         }
 567       else
 568         {
 569           if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index,
 570                                                      ip, SNAT_PROTOCOL_ICMP,
 571                                                      rx_fib_index,
 572                                                      thread_index)))
 573             {
 574               dont_translate = 1;
 575               goto out;
 576             }
 577         }
 578
 579       if (PREDICT_FALSE (icmp_is_error_message (icmp)))
 580         {
 581           b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
 582           next = NAT_NEXT_DROP;
 583           goto out;
 584         }
 585
 586       next = slow_path_ed (sm, b, rx_fib_index, &kv, &s, node, next,
 587                            thread_index, vlib_time_now (sm->vlib_main), 0);
 588
 589       if (PREDICT_FALSE (next == NAT_NEXT_DROP))
 590         goto out;
 591
 592       if (!s)
 593         {
 594           dont_translate = 1;
 595           goto out;
 596         }
 597     }
 598   else
 599     {
 600       if (PREDICT_FALSE (icmp->type != ICMP4_echo_request &&
 601                          icmp->type != ICMP4_echo_reply &&
 602                          !icmp_is_error_message (icmp)))
 603         {
 604           b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
 605           next = NAT_NEXT_DROP;
 606           goto out;
 607         }
 608
 609       s = pool_elt_at_index (tsm->sessions, value.value);
 610     }
 611
 612   *p_proto = ip_proto_to_snat_proto (key.proto);
 613 out:
 614   if (s)
 615     *p_value = s->out2in;
 616   *p_dont_translate = dont_translate;
 617   if (d)
 618     *(snat_session_t **) d = s;
 619   return next;
 620 }
 621 #endif
 622
 623 static snat_session_t *
 624 nat44_ed_in2out_unknown_proto (snat_main_t * sm,
 625                                vlib_buffer_t * b,
 626                                ip4_header_t * ip,
 627                                u32 rx_fib_index,
 628                                u32 thread_index,
 629                                f64 now,
 630                                vlib_main_t * vm, vlib_node_runtime_t * node)
 631 {
 632   clib_bihash_kv_8_8_t kv, value;
 633   clib_bihash_kv_16_8_t s_kv, s_value;
 634   snat_static_mapping_t *m;
 635   u32 old_addr, new_addr = 0;
 636   ip_csum_t sum;
 637   snat_user_t *u;
 638   dlist_elt_t *head, *elt;
 639   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 640   u32 elt_index, head_index, ses_index;
 641   snat_session_t *s;
 642   u32 outside_fib_index = sm->outside_fib_index;
 643   int i;
 644   u8 is_sm = 0;
 645   nat_outside_fib_t *outside_fib;
 646   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
 647   fib_prefix_t pfx = {
 648     .fp_proto = FIB_PROTOCOL_IP4,
 649     .fp_len = 32,
 650     .fp_addr = {
 651                 .ip4.as_u32 = ip->dst_address.as_u32,
 652                 },
 653   };
 654
 655   switch (vec_len (sm->outside_fibs))
 656     {
 657     case 0:
 658       outside_fib_index = sm->outside_fib_index;
 659       break;
 660     case 1:
 661       outside_fib_index = sm->outside_fibs[0].fib_index;
 662       break;
 663     default:
 664       /* *INDENT-OFF* */
 665       vec_foreach (outside_fib, sm->outside_fibs)
 666         {
 667           fei = fib_table_lookup (outside_fib->fib_index, &pfx);
 668           if (FIB_NODE_INDEX_INVALID != fei)
 669             {
 670               if (fib_entry_get_resolving_interface (fei) != ~0)
 671                 {
 672                   outside_fib_index = outside_fib->fib_index;
 673                   break;
 674                 }
 675             }
 676         }
 677       /* *INDENT-ON* */
 678       break;
 679     }
 680   old_addr = ip->src_address.as_u32;
 681
 682   make_ed_kv (&s_kv, &ip->src_address, &ip->dst_address, ip->protocol,
 683               rx_fib_index, 0, 0);
 684
 685   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &s_kv, &s_value))
 686     {
 687       s = pool_elt_at_index (tsm->sessions, s_value.value);
 688       new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
 689     }
 690   else
 691     {
 692       if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
 693         {
 694           b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
 695           nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
 696           nat_elog_notice ("maximum sessions exceeded");
 697           return 0;
 698         }
 699
 700       u = nat_user_get_or_create (sm, &ip->src_address, rx_fib_index,
 701                                   thread_index);
 702       if (!u)
 703         {
 704           nat_elog_warn ("create NAT user failed");
 705           return 0;
 706         }
 707
 708       make_sm_kv (&kv, &ip->src_address, 0, rx_fib_index, 0);
 709
 710       /* Try to find static mapping first */
 711       if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
 712         {
 713           m = pool_elt_at_index (sm->static_mappings, value.value);
 714           new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
 715           is_sm = 1;
 716           goto create_ses;
 717         }
 718       /* Fallback to 3-tuple key */
 719       else
 720         {
 721           /* Choose same out address as for TCP/UDP session to same destination */
 722           head_index = u->sessions_per_user_list_head_index;
 723           head = pool_elt_at_index (tsm->list_pool, head_index);
 724           elt_index = head->next;
 725           if (PREDICT_FALSE (elt_index == ~0))
 726             ses_index = ~0;
 727           else
 728             {
 729               elt = pool_elt_at_index (tsm->list_pool, elt_index);
 730               ses_index = elt->value;
 731             }
 732
 733           while (ses_index != ~0)
 734             {
 735               s = pool_elt_at_index (tsm->sessions, ses_index);
 736               elt_index = elt->next;
 737               elt = pool_elt_at_index (tsm->list_pool, elt_index);
 738               ses_index = elt->value;
 739
 740               if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
 741                 {
 742                   new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
 743
 744                   make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address,
 745                               ip->protocol, outside_fib_index, 0, 0);
 746                   if (clib_bihash_search_16_8
 747                       (&tsm->out2in_ed, &s_kv, &s_value))
 748                     goto create_ses;
 749
 750                   break;
 751                 }
 752             }
 753
 754           for (i = 0; i < vec_len (sm->addresses); i++)
 755             {
 756               make_ed_kv (&s_kv, &sm->addresses[i].addr, &ip->dst_address,
 757                           ip->protocol, outside_fib_index, 0, 0);
 758               if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
 759                 {
 760                   new_addr = ip->src_address.as_u32 =
 761                     sm->addresses[i].addr.as_u32;
 762                   goto create_ses;
 763                 }
 764             }
 765           return 0;
 766         }
 767
 768     create_ses:
 769       s = nat_ed_session_alloc (sm, u, thread_index, now);
 770       if (!s)
 771         {
 772           nat44_delete_user_with_no_session (sm, u, thread_index);
 773           nat_elog_warn ("create NAT session failed");
 774           return 0;
 775         }
 776
 777       s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
 778       s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
 779       s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
 780       s->out2in.addr.as_u32 = new_addr;
 781       s->out2in.fib_index = outside_fib_index;
 782       s->in2out.addr.as_u32 = old_addr;
 783       s->in2out.fib_index = rx_fib_index;
 784       s->in2out.port = s->out2in.port = ip->protocol;
 785       if (is_sm)
 786         s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
 787       user_session_increment (sm, u, is_sm);
 788
 789       /* Add to lookup tables */
 790       make_ed_kv (&s_kv, &s->in2out.addr, &ip->dst_address, ip->protocol,
 791                   rx_fib_index, 0, 0);
 792       s_kv.value = s - tsm->sessions;
 793       if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1))
 794         nat_elog_notice ("in2out key add failed");
 795
 796       make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address, ip->protocol,
 797                   outside_fib_index, 0, 0);
 798       s_kv.value = s - tsm->sessions;
 799       if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1))
 800         nat_elog_notice ("out2in key add failed");
 801     }
 802
 803   /* Update IP checksum */
 804   sum = ip->checksum;
 805   sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
 806   ip->checksum = ip_csum_fold (sum);
 807
 808   /* Accounting */
 809   nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b),
 810                                  thread_index);
 811   /* Per-user LRU list maintenance */
 812   nat44_session_update_lru (sm, s, thread_index);
 813
 814   /* Hairpinning */
 815   if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
 816     nat44_ed_hairpinning_unknown_proto (sm, b, ip);
 817
 818   if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
 819     vnet_buffer (b)->sw_if_index[VLIB_TX] = outside_fib_index;
 820
 821   return s;
 822 }
 823
 824 static inline uword
 825 nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
 826                                 vlib_node_runtime_t * node,
 827                                 vlib_frame_t * frame, int is_slow_path,
 828                                 int is_output_feature)
 829 {
 830   u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
 831   nat_next_t next_index;
 832   snat_main_t *sm = &snat_main;
 833   f64 now = vlib_time_now (vm);
 834   u32 thread_index = vm->thread_index;
 835   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 836   u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
 837     0, fragments = 0, def_slow, def_reass;
 838
 839   def_slow = is_output_feature ? NAT_NEXT_IN2OUT_ED_OUTPUT_SLOW_PATH :
 840     NAT_NEXT_IN2OUT_ED_SLOW_PATH;
 841
 842   def_reass = is_output_feature ? NAT_NEXT_IN2OUT_ED_OUTPUT_REASS :
 843     NAT_NEXT_IN2OUT_ED_REASS;
 844
 845   stats_node_index = is_slow_path ? sm->ed_in2out_slowpath_node_index :
 846     sm->ed_in2out_node_index;
 847
 848   from = vlib_frame_vector_args (frame);
 849   n_left_from = frame->n_vectors;
 850   next_index = node->cached_next_index;
 851
 852   while (n_left_from > 0)
 853     {
 854       u32 n_left_to_next;
 855
 856       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 857
 858       while (n_left_from >= 4 && n_left_to_next >= 2)
 859         {
 860           u32 bi0, bi1;
 861           vlib_buffer_t *b0, *b1;
 862           u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
 863             new_addr0, old_addr0;
 864           u32 next1, sw_if_index1, rx_fib_index1, iph_offset1 = 0, proto1,
 865             new_addr1, old_addr1;
 866           u16 old_port0, new_port0, old_port1, new_port1;
 867           ip4_header_t *ip0, *ip1;
 868           udp_header_t *udp0, *udp1;
 869           tcp_header_t *tcp0, *tcp1;
 870           icmp46_header_t *icmp0, *icmp1;
 871           snat_session_t *s0 = 0, *s1 = 0;
 872           clib_bihash_kv_16_8_t kv0, value0, kv1, value1;
 873           ip_csum_t sum0, sum1;
 874
 875           /* Prefetch next iteration. */
 876           {
 877             vlib_buffer_t *p2, *p3;
 878
 879             p2 = vlib_get_buffer (vm, from[2]);
 880             p3 = vlib_get_buffer (vm, from[3]);
 881
 882             vlib_prefetch_buffer_header (p2, LOAD);
 883             vlib_prefetch_buffer_header (p3, LOAD);
 884
 885             CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
 886             CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
 887           }
 888
 889           /* speculatively enqueue b0 and b1 to the current next frame */
 890           to_next[0] = bi0 = from[0];
 891           to_next[1] = bi1 = from[1];
 892           from += 2;
 893           to_next += 2;
 894           n_left_from -= 2;
 895           n_left_to_next -= 2;
 896
 897           b0 = vlib_get_buffer (vm, bi0);
 898           b1 = vlib_get_buffer (vm, bi1);
 899
 900           if (is_output_feature)
 901             {
 902               // output feature fast path is enabled on the arc
 903               // we need new arc_next feature
 904               if (PREDICT_TRUE (!is_slow_path))
 905                 {
 906                   vnet_feature_next (&nat_buffer_opaque (b0)->arc_next, b0);
 907                   vnet_feature_next (&nat_buffer_opaque (b1)->arc_next, b1);
 908                 }
 909
 910               iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
 911               iph_offset1 = vnet_buffer (b1)->ip.save_rewrite_length;
 912             }
 913
 914           next0 = nat_buffer_opaque (b0)->arc_next;
 915           next1 = nat_buffer_opaque (b1)->arc_next;
 916
 917           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
 918                                   iph_offset0);
 919
 920           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 921           rx_fib_index0 =
 922             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
 923                                                  sw_if_index0);
 924
 925           if (PREDICT_FALSE (ip0->ttl == 1))
 926             {
 927               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 928               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
 929                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
 930                                            0);
 931               next0 = NAT_NEXT_ICMP_ERROR;
 932               goto trace00;
 933             }
 934
 935           udp0 = ip4_next_header (ip0);
 936           tcp0 = (tcp_header_t *) udp0;
 937           icmp0 = (icmp46_header_t *) udp0;
 938           proto0 = ip_proto_to_snat_proto (ip0->protocol);
 939
 940           if (is_slow_path)
 941             {
 942               if (PREDICT_FALSE (proto0 == ~0))
 943                 {
 944                   s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
 945                                                       rx_fib_index0,
 946                                                       thread_index, now, vm,
 947                                                       node);
 948                   if (!s0)
 949                     next0 = NAT_NEXT_DROP;
 950                   other_packets++;
 951                   goto trace00;
 952                 }
 953
 954               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
 955                 {
 956                   next0 = icmp_in2out_ed_slow_path
 957                     (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
 958                      next0, now, thread_index, &s0);
 959                   icmp_packets++;
 960                   goto trace00;
 961                 }
 962             }
 963           else
 964             {
 965               if (PREDICT_FALSE (proto0 == ~0))
 966                 {
 967                   next0 = def_slow;
 968                   goto trace00;
 969                 }
 970
 971               if (ip4_is_fragment (ip0))
 972                 {
 973                   next0 = def_reass;
 974                   fragments++;
 975                   goto trace00;
 976                 }
 977
 978               if (is_output_feature)
 979                 {
 980                   if (PREDICT_FALSE
 981                       (nat_not_translate_output_feature_fwd
 982                        (sm, ip0, thread_index, now, vm, b0)))
 983                     goto trace00;
 984                 }
 985
 986               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
 987                 {
 988                   next0 = def_slow;
 989                   goto trace00;
 990                 }
 991             }
 992
 993           make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
 994                       ip0->protocol, rx_fib_index0, udp0->src_port,
 995                       udp0->dst_port);
 996
 997           if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
 998             {
 999               if (is_slow_path)
1000                 {
1001                   if (is_output_feature)
1002                     {
1003                       if (PREDICT_FALSE
1004                           (nat44_ed_not_translate_output_feature
1005                            (sm, ip0, ip0->protocol, udp0->src_port,
1006                             udp0->dst_port, thread_index, sw_if_index0,
1007                             vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1008                         goto trace00;
1009
1010                       /*
1011                        * Send DHCP packets to the ipv4 stack, or we won't
1012                        * be able to use dhcp client on the outside interface
1013                        */
1014                       if (PREDICT_FALSE
1015                           ((b0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)
1016                            && proto0 == SNAT_PROTOCOL_UDP
1017                            && (udp0->dst_port ==
1018                                clib_host_to_net_u16
1019                                (UDP_DST_PORT_dhcp_to_server))))
1020                         goto trace00;
1021                     }
1022                   else
1023                     {
1024                       if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1025                                                                  sw_if_index0,
1026                                                                  ip0, proto0,
1027                                                                  rx_fib_index0,
1028                                                                  thread_index)))
1029                         goto trace00;
1030                     }
1031
1032                   next0 =
1033                     slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1034                                   next0, thread_index, now, tcp0);
1035
1036                   if (PREDICT_FALSE (next0 == NAT_NEXT_DROP))
1037                     goto trace00;
1038
1039                   if (PREDICT_FALSE (!s0))
1040                     goto trace00;
1041                 }
1042               else
1043                 {
1044                   next0 = def_slow;
1045                   goto trace00;
1046                 }
1047             }
1048           else
1049             {
1050               s0 = pool_elt_at_index (tsm->sessions, value0.value);
1051             }
1052
1053           b0->flags |= VNET_BUFFER_F_IS_NATED;
1054
1055           if (!is_output_feature)
1056             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1057
1058           old_addr0 = ip0->src_address.as_u32;
1059           new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1060           sum0 = ip0->checksum;
1061           sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1062                                  src_address);
1063           if (PREDICT_FALSE (is_twice_nat_session (s0)))
1064             sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1065                                    s0->ext_host_addr.as_u32, ip4_header_t,
1066                                    dst_address);
1067           ip0->checksum = ip_csum_fold (sum0);
1068
1069           old_port0 = udp0->src_port;
1070           new_port0 = udp0->src_port = s0->out2in.port;
1071
1072           if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1073             {
1074               sum0 = tcp0->checksum;
1075               sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1076                                      dst_address);
1077               sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1078                                      length);
1079               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1080                 {
1081                   sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1082                                          s0->ext_host_addr.as_u32,
1083                                          ip4_header_t, dst_address);
1084                   sum0 = ip_csum_update (sum0, tcp0->dst_port,
1085                                          s0->ext_host_port, ip4_header_t,
1086                                          length);
1087                   tcp0->dst_port = s0->ext_host_port;
1088                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1089                 }
1090               mss_clamping (sm, tcp0, &sum0);
1091               tcp0->checksum = ip_csum_fold (sum0);
1092               tcp_packets++;
1093               if (nat44_set_tcp_session_state_i2o
1094                   (sm, s0, tcp0, thread_index))
1095                 goto trace00;
1096             }
1097           else if (udp0->checksum)
1098             {
1099               sum0 = udp0->checksum;
1100               sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1101                                      dst_address);
1102               sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1103                                      length);
1104               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1105                 {
1106                   sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1107                                          s0->ext_host_addr.as_u32,
1108                                          ip4_header_t, dst_address);
1109                   sum0 = ip_csum_update (sum0, tcp0->dst_port,
1110                                          s0->ext_host_port, ip4_header_t,
1111                                          length);
1112                   udp0->dst_port = s0->ext_host_port;
1113                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1114                 }
1115               udp0->checksum = ip_csum_fold (sum0);
1116               udp_packets++;
1117             }
1118           else
1119             {
1120               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1121                 {
1122                   udp0->dst_port = s0->ext_host_port;
1123                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1124                 }
1125               udp_packets++;
1126             }
1127
1128           /* Accounting */
1129           nat44_session_update_counters (s0, now,
1130                                          vlib_buffer_length_in_chain (vm,
1131                                                                       b0),
1132                                          thread_index);
1133           /* Per-user LRU list maintenance */
1134           nat44_session_update_lru (sm, s0, thread_index);
1135
1136         trace00:
1137           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1138                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1139             {
1140               nat_in2out_ed_trace_t *t =
1141                 vlib_add_trace (vm, node, b0, sizeof (*t));
1142               t->is_slow_path = is_slow_path;
1143               t->sw_if_index = sw_if_index0;
1144               t->next_index = next0;
1145               t->session_index = ~0;
1146               if (s0)
1147                 t->session_index = s0 - tsm->sessions;
1148             }
1149
1150           pkts_processed += next0 == nat_buffer_opaque (b0)->arc_next;
1151
1152           ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
1153                                   iph_offset1);
1154
1155           sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
1156           rx_fib_index1 =
1157             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1158                                                  sw_if_index1);
1159
1160           if (PREDICT_FALSE (ip1->ttl == 1))
1161             {
1162               vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1163               icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
1164                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
1165                                            0);
1166               next1 = NAT_NEXT_ICMP_ERROR;
1167               goto trace01;
1168             }
1169
1170           udp1 = ip4_next_header (ip1);
1171           tcp1 = (tcp_header_t *) udp1;
1172           icmp1 = (icmp46_header_t *) udp1;
1173           proto1 = ip_proto_to_snat_proto (ip1->protocol);
1174
1175           if (is_slow_path)
1176             {
1177               if (PREDICT_FALSE (proto1 == ~0))
1178                 {
1179                   s1 = nat44_ed_in2out_unknown_proto (sm, b1, ip1,
1180                                                       rx_fib_index1,
1181                                                       thread_index, now, vm,
1182                                                       node);
1183                   if (!s1)
1184                     next1 = NAT_NEXT_DROP;
1185                   other_packets++;
1186                   goto trace01;
1187                 }
1188
1189               if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1190                 {
1191                   next1 = icmp_in2out_ed_slow_path
1192                     (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
1193                      next1, now, thread_index, &s1);
1194                   icmp_packets++;
1195                   goto trace01;
1196                 }
1197             }
1198           else
1199             {
1200               if (PREDICT_FALSE (proto1 == ~0))
1201                 {
1202                   next1 = def_slow;
1203                   goto trace01;
1204                 }
1205
1206               if (ip4_is_fragment (ip1))
1207                 {
1208                   next1 = def_reass;
1209                   fragments++;
1210                   goto trace01;
1211                 }
1212
1213               if (is_output_feature)
1214                 {
1215                   if (PREDICT_FALSE
1216                       (nat_not_translate_output_feature_fwd
1217                        (sm, ip1, thread_index, now, vm, b1)))
1218                     goto trace01;
1219                 }
1220
1221               if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1222                 {
1223                   next1 = def_slow;
1224                   goto trace01;
1225                 }
1226             }
1227
1228           make_ed_kv (&kv1, &ip1->src_address, &ip1->dst_address,
1229                       ip1->protocol, rx_fib_index1, udp1->src_port,
1230                       udp1->dst_port);
1231
1232           if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv1, &value1))
1233             {
1234               if (is_slow_path)
1235                 {
1236                   if (is_output_feature)
1237                     {
1238                       if (PREDICT_FALSE
1239                           (nat44_ed_not_translate_output_feature
1240                            (sm, ip1, ip1->protocol, udp1->src_port,
1241                             udp1->dst_port, thread_index, sw_if_index1,
1242                             vnet_buffer (b1)->sw_if_index[VLIB_TX])))
1243                         goto trace01;
1244
1245                       /*
1246                        * Send DHCP packets to the ipv4 stack, or we won't
1247                        * be able to use dhcp client on the outside interface
1248                        */
1249                       if (PREDICT_FALSE
1250                           ((b1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)
1251                            && proto1 == SNAT_PROTOCOL_UDP
1252                            && (udp1->dst_port ==
1253                                clib_host_to_net_u16
1254                                (UDP_DST_PORT_dhcp_to_server))))
1255                         goto trace01;
1256                     }
1257                   else
1258                     {
1259                       if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1260                                                                  sw_if_index1,
1261                                                                  ip1, proto1,
1262                                                                  rx_fib_index1,
1263                                                                  thread_index)))
1264                         goto trace01;
1265                     }
1266
1267                   next1 =
1268                     slow_path_ed (sm, b1, rx_fib_index1, &kv1, &s1, node,
1269                                   next1, thread_index, now, tcp1);
1270
1271                   if (PREDICT_FALSE (next1 == NAT_NEXT_DROP))
1272                     goto trace01;
1273
1274                   if (PREDICT_FALSE (!s1))
1275                     goto trace01;
1276                 }
1277               else
1278                 {
1279                   next1 = def_slow;
1280                   goto trace01;
1281                 }
1282             }
1283           else
1284             {
1285               s1 = pool_elt_at_index (tsm->sessions, value1.value);
1286             }
1287
1288           b1->flags |= VNET_BUFFER_F_IS_NATED;
1289
1290           if (!is_output_feature)
1291             vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
1292
1293           old_addr1 = ip1->src_address.as_u32;
1294           new_addr1 = ip1->src_address.as_u32 = s1->out2in.addr.as_u32;
1295           sum1 = ip1->checksum;
1296           sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1297                                  src_address);
1298           if (PREDICT_FALSE (is_twice_nat_session (s1)))
1299             sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1300                                    s1->ext_host_addr.as_u32, ip4_header_t,
1301                                    dst_address);
1302           ip1->checksum = ip_csum_fold (sum1);
1303
1304           old_port1 = udp1->src_port;
1305           new_port1 = udp1->src_port = s1->out2in.port;
1306
1307           if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1308             {
1309               sum1 = tcp1->checksum;
1310               sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1311                                      dst_address);
1312               sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t,
1313                                      length);
1314               if (PREDICT_FALSE (is_twice_nat_session (s1)))
1315                 {
1316                   sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1317                                          s1->ext_host_addr.as_u32,
1318                                          ip4_header_t, dst_address);
1319                   sum1 = ip_csum_update (sum1, tcp1->dst_port,
1320                                          s1->ext_host_port, ip4_header_t,
1321                                          length);
1322                   tcp1->dst_port = s1->ext_host_port;
1323                   ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1324                 }
1325               tcp1->checksum = ip_csum_fold (sum1);
1326               mss_clamping (sm, tcp1, &sum1);
1327               tcp_packets++;
1328               if (nat44_set_tcp_session_state_i2o
1329                   (sm, s1, tcp1, thread_index))
1330                 goto trace01;
1331             }
1332           else if (udp1->checksum)
1333             {
1334               sum1 = udp1->checksum;
1335               sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1336                                      dst_address);
1337               sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t,
1338                                      length);
1339
1340               if (PREDICT_FALSE (is_twice_nat_session (s1)))
1341                 {
1342                   sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1343                                          s1->ext_host_addr.as_u32,
1344                                          ip4_header_t, dst_address);
1345                   sum1 = ip_csum_update (sum1, tcp1->dst_port,
1346                                          s1->ext_host_port, ip4_header_t,
1347                                          length);
1348                   udp1->dst_port = s1->ext_host_port;
1349                   ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1350                 }
1351               udp1->checksum = ip_csum_fold (sum1);
1352               udp_packets++;
1353             }
1354           else
1355             {
1356               if (PREDICT_FALSE (is_twice_nat_session (s1)))
1357                 {
1358                   udp1->dst_port = s1->ext_host_port;
1359                   ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1360                 }
1361               udp_packets++;
1362             }
1363
1364           /* Accounting */
1365           nat44_session_update_counters (s1, now,
1366                                          vlib_buffer_length_in_chain (vm, b1),
1367                                          thread_index);
1368           /* Per-user LRU list maintenance */
1369           nat44_session_update_lru (sm, s1, thread_index);
1370
1371         trace01:
1372           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1373                              && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1374             {
1375               nat_in2out_ed_trace_t *t =
1376                 vlib_add_trace (vm, node, b1, sizeof (*t));
1377               t->is_slow_path = is_slow_path;
1378               t->sw_if_index = sw_if_index1;
1379               t->next_index = next1;
1380               t->session_index = ~0;
1381               if (s1)
1382                 t->session_index = s1 - tsm->sessions;
1383             }
1384
1385           pkts_processed += next1 == nat_buffer_opaque (b1)->arc_next;
1386
1387
1388           /* verify speculative enqueues, maybe switch current next frame */
1389           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1390                                            to_next, n_left_to_next,
1391                                            bi0, bi1, next0, next1);
1392         }
1393
1394       while (n_left_from > 0 && n_left_to_next > 0)
1395         {
1396           u32 bi0;
1397           vlib_buffer_t *b0;
1398           u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
1399             new_addr0, old_addr0;
1400           u16 old_port0, new_port0;
1401           ip4_header_t *ip0;
1402           udp_header_t *udp0;
1403           tcp_header_t *tcp0;
1404           icmp46_header_t *icmp0;
1405           snat_session_t *s0 = 0;
1406           clib_bihash_kv_16_8_t kv0, value0;
1407           ip_csum_t sum0;
1408
1409           /* speculatively enqueue b0 to the current next frame */
1410           bi0 = from[0];
1411           to_next[0] = bi0;
1412           from += 1;
1413           to_next += 1;
1414           n_left_from -= 1;
1415           n_left_to_next -= 1;
1416
1417           b0 = vlib_get_buffer (vm, bi0);
1418
1419           if (is_output_feature)
1420             {
1421               // output feature fast path is enabled on the arc
1422               // we need new arc_next feature
1423               if (PREDICT_TRUE (!is_slow_path))
1424                 vnet_feature_next (&nat_buffer_opaque (b0)->arc_next, b0);
1425
1426               iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1427             }
1428
1429           next0 = nat_buffer_opaque (b0)->arc_next;
1430
1431           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1432                                   iph_offset0);
1433
1434           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1435           rx_fib_index0 =
1436             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1437                                                  sw_if_index0);
1438
1439           if (PREDICT_FALSE (ip0->ttl == 1))
1440             {
1441               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1442               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1443                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
1444                                            0);
1445               next0 = NAT_NEXT_ICMP_ERROR;
1446               goto trace0;
1447             }
1448
1449           udp0 = ip4_next_header (ip0);
1450           tcp0 = (tcp_header_t *) udp0;
1451           icmp0 = (icmp46_header_t *) udp0;
1452           proto0 = ip_proto_to_snat_proto (ip0->protocol);
1453
1454           if (is_slow_path)
1455             {
1456               if (PREDICT_FALSE (proto0 == ~0))
1457                 {
1458                   s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
1459                                                       rx_fib_index0,
1460                                                       thread_index, now, vm,
1461                                                       node);
1462                   if (!s0)
1463                     next0 = NAT_NEXT_DROP;
1464                   other_packets++;
1465                   goto trace0;
1466                 }
1467
1468               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1469                 {
1470                   next0 = icmp_in2out_ed_slow_path
1471                     (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1472                      next0, now, thread_index, &s0);
1473                   icmp_packets++;
1474                   goto trace0;
1475                 }
1476             }
1477           else
1478             {
1479               if (PREDICT_FALSE (proto0 == ~0))
1480                 {
1481                   next0 = def_slow;
1482                   goto trace0;
1483                 }
1484
1485               if (ip4_is_fragment (ip0))
1486                 {
1487                   next0 = def_reass;
1488                   fragments++;
1489                   goto trace0;
1490                 }
1491
1492               if (is_output_feature)
1493                 {
1494                   if (PREDICT_FALSE
1495                       (nat_not_translate_output_feature_fwd
1496                        (sm, ip0, thread_index, now, vm, b0)))
1497                     goto trace0;
1498                 }
1499
1500               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1501                 {
1502                   next0 = def_slow;
1503                   goto trace0;
1504                 }
1505             }
1506
1507           make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1508                       ip0->protocol, rx_fib_index0, udp0->src_port,
1509                       udp0->dst_port);
1510
1511           if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1512             {
1513               if (is_slow_path)
1514                 {
1515                   if (is_output_feature)
1516                     {
1517                       if (PREDICT_FALSE
1518                           (nat44_ed_not_translate_output_feature
1519                            (sm, ip0, ip0->protocol, udp0->src_port,
1520                             udp0->dst_port, thread_index, sw_if_index0,
1521                             vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1522                         goto trace0;
1523
1524                       /*
1525                        * Send DHCP packets to the ipv4 stack, or we won't
1526                        * be able to use dhcp client on the outside interface
1527                        */
1528                       if (PREDICT_FALSE
1529                           ((b0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)
1530                            && proto0 == SNAT_PROTOCOL_UDP
1531                            && (udp0->dst_port ==
1532                                clib_host_to_net_u16
1533                                (UDP_DST_PORT_dhcp_to_server))))
1534                         goto trace0;
1535                     }
1536                   else
1537                     {
1538                       if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1539                                                                  sw_if_index0,
1540                                                                  ip0, proto0,
1541                                                                  rx_fib_index0,
1542                                                                  thread_index)))
1543                         goto trace0;
1544                     }
1545
1546                   next0 =
1547                     slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1548                                   next0, thread_index, now, tcp0);
1549
1550                   if (PREDICT_FALSE (next0 == NAT_NEXT_DROP))
1551                     goto trace0;
1552
1553                   if (PREDICT_FALSE (!s0))
1554                     goto trace0;
1555                 }
1556               else
1557                 {
1558                   next0 = def_slow;
1559                   goto trace0;
1560                 }
1561             }
1562           else
1563             {
1564               s0 = pool_elt_at_index (tsm->sessions, value0.value);
1565             }
1566
1567           b0->flags |= VNET_BUFFER_F_IS_NATED;
1568
1569           if (!is_output_feature)
1570             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1571
1572           old_addr0 = ip0->src_address.as_u32;
1573           new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1574           sum0 = ip0->checksum;
1575           sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1576                                  src_address);
1577           if (PREDICT_FALSE (is_twice_nat_session (s0)))
1578             sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1579                                    s0->ext_host_addr.as_u32, ip4_header_t,
1580                                    dst_address);
1581           ip0->checksum = ip_csum_fold (sum0);
1582
1583           old_port0 = udp0->src_port;
1584           new_port0 = udp0->src_port = s0->out2in.port;
1585
1586           if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1587             {
1588               sum0 = tcp0->checksum;
1589               sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1590                                      dst_address);
1591               sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1592                                      length);
1593               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1594                 {
1595                   sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1596                                          s0->ext_host_addr.as_u32,
1597                                          ip4_header_t, dst_address);
1598                   sum0 = ip_csum_update (sum0, tcp0->dst_port,
1599                                          s0->ext_host_port, ip4_header_t,
1600                                          length);
1601                   tcp0->dst_port = s0->ext_host_port;
1602                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1603                 }
1604               mss_clamping (sm, tcp0, &sum0);
1605               tcp0->checksum = ip_csum_fold (sum0);
1606               tcp_packets++;
1607               if (nat44_set_tcp_session_state_i2o
1608                   (sm, s0, tcp0, thread_index))
1609                 goto trace0;
1610             }
1611           else if (udp0->checksum)
1612             {
1613               sum0 = udp0->checksum;
1614               sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1615                                      dst_address);
1616               sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1617                                      length);
1618               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1619                 {
1620                   sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1621                                          s0->ext_host_addr.as_u32,
1622                                          ip4_header_t, dst_address);
1623                   sum0 = ip_csum_update (sum0, tcp0->dst_port,
1624                                          s0->ext_host_port, ip4_header_t,
1625                                          length);
1626                   udp0->dst_port = s0->ext_host_port;
1627                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1628                 }
1629               udp0->checksum = ip_csum_fold (sum0);
1630               udp_packets++;
1631             }
1632           else
1633             {
1634               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1635                 {
1636                   udp0->dst_port = s0->ext_host_port;
1637                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1638                 }
1639               udp_packets++;
1640             }
1641
1642           /* Accounting */
1643           nat44_session_update_counters (s0, now,
1644                                          vlib_buffer_length_in_chain (vm, b0),
1645                                          thread_index);
1646           /* Per-user LRU list maintenance */
1647           nat44_session_update_lru (sm, s0, thread_index);
1648
1649         trace0:
1650           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1651                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1652             {
1653               nat_in2out_ed_trace_t *t =
1654                 vlib_add_trace (vm, node, b0, sizeof (*t));
1655               t->is_slow_path = is_slow_path;
1656               t->sw_if_index = sw_if_index0;
1657               t->next_index = next0;
1658               t->session_index = ~0;
1659               if (s0)
1660                 t->session_index = s0 - tsm->sessions;
1661             }
1662
1663           pkts_processed += next0 == nat_buffer_opaque (b0)->arc_next;
1664
1665           /* verify speculative enqueue, maybe switch current next frame */
1666           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1667                                            to_next, n_left_to_next,
1668                                            bi0, next0);
1669         }
1670
1671       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1672     }
1673
1674   vlib_node_increment_counter (vm, stats_node_index,
1675                                NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
1676                                pkts_processed);
1677   vlib_node_increment_counter (vm, stats_node_index,
1678                                NAT_IN2OUT_ED_ERROR_TCP_PACKETS, tcp_packets);
1679   vlib_node_increment_counter (vm, stats_node_index,
1680                                NAT_IN2OUT_ED_ERROR_UDP_PACKETS, udp_packets);
1681   vlib_node_increment_counter (vm, stats_node_index,
1682                                NAT_IN2OUT_ED_ERROR_ICMP_PACKETS,
1683                                icmp_packets);
1684   vlib_node_increment_counter (vm, stats_node_index,
1685                                NAT_IN2OUT_ED_ERROR_OTHER_PACKETS,
1686                                other_packets);
1687   vlib_node_increment_counter (vm, stats_node_index,
1688                                NAT_IN2OUT_ED_ERROR_FRAGMENTS, fragments);
1689
1690   return frame->n_vectors;
1691 }
1692
1693 static inline uword
1694 nat44_ed_in2out_reass_node_fn_inline (vlib_main_t * vm,
1695                                       vlib_node_runtime_t * node,
1696                                       vlib_frame_t * frame,
1697                                       int is_output_feature)
1698 {
1699   u32 n_left_from, *from, *to_next;
1700   nat_next_t next_index;
1701   u32 pkts_processed = 0, cached_fragments = 0;
1702   snat_main_t *sm = &snat_main;
1703   f64 now = vlib_time_now (vm);
1704   u32 thread_index = vm->thread_index;
1705   snat_main_per_thread_data_t *per_thread_data =
1706     &sm->per_thread_data[thread_index];
1707   u32 *fragments_to_drop = 0;
1708   u32 *fragments_to_loopback = 0;
1709
1710   from = vlib_frame_vector_args (frame);
1711   n_left_from = frame->n_vectors;
1712   next_index = node->cached_next_index;
1713
1714   while (n_left_from > 0)
1715     {
1716       u32 n_left_to_next;
1717
1718       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1719
1720       while (n_left_from > 0 && n_left_to_next > 0)
1721         {
1722           u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
1723           u32 iph_offset0 = 0;
1724           vlib_buffer_t *b0;
1725           u32 next0;
1726           u8 cached0 = 0;
1727           ip4_header_t *ip0 = 0;
1728           nat_reass_ip4_t *reass0;
1729           udp_header_t *udp0;
1730           tcp_header_t *tcp0;
1731           icmp46_header_t *icmp0;
1732           clib_bihash_kv_16_8_t kv0, value0;
1733           snat_session_t *s0 = 0;
1734           u16 old_port0, new_port0;
1735           ip_csum_t sum0;
1736
1737           /* speculatively enqueue b0 to the current next frame */
1738           bi0 = from[0];
1739           to_next[0] = bi0;
1740           from += 1;
1741           to_next += 1;
1742           n_left_from -= 1;
1743           n_left_to_next -= 1;
1744
1745           b0 = vlib_get_buffer (vm, bi0);
1746
1747           next0 = nat_buffer_opaque (b0)->arc_next;
1748
1749           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1750           rx_fib_index0 =
1751             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1752                                                  sw_if_index0);
1753
1754           if (PREDICT_FALSE (nat_reass_is_drop_frag (0)))
1755             {
1756               next0 = NAT_NEXT_DROP;
1757               b0->error = node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT];
1758               goto trace0;
1759             }
1760
1761           if (is_output_feature)
1762             iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1763
1764           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1765                                   iph_offset0);
1766
1767           udp0 = ip4_next_header (ip0);
1768           tcp0 = (tcp_header_t *) udp0;
1769           icmp0 = (icmp46_header_t *) udp0;
1770           proto0 = ip_proto_to_snat_proto (ip0->protocol);
1771
1772           reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
1773                                                  ip0->dst_address,
1774                                                  ip0->fragment_id,
1775                                                  ip0->protocol,
1776                                                  1, &fragments_to_drop);
1777
1778           if (PREDICT_FALSE (!reass0))
1779             {
1780               next0 = NAT_NEXT_DROP;
1781               b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_REASS];
1782               nat_elog_notice ("maximum reassemblies exceeded");
1783               goto trace0;
1784             }
1785
1786           if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1787             {
1788               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1789                 {
1790                   if (is_output_feature)
1791                     {
1792                       if (PREDICT_FALSE
1793                           (nat_not_translate_output_feature_fwd
1794                            (sm, ip0, thread_index, now, vm, b0)))
1795                         reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1796                       goto trace0;
1797                     }
1798
1799                   next0 = icmp_in2out_ed_slow_path
1800                     (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1801                      next0, now, thread_index, &s0);
1802
1803                   if (PREDICT_TRUE (next0 != NAT_NEXT_DROP))
1804                     {
1805                       if (s0)
1806                         reass0->sess_index = s0 - per_thread_data->sessions;
1807                       else
1808                         reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1809                       nat_ip4_reass_get_frags (reass0,
1810                                                &fragments_to_loopback);
1811                     }
1812
1813                   goto trace0;
1814                 }
1815
1816               make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1817                           ip0->protocol, rx_fib_index0, udp0->src_port,
1818                           udp0->dst_port);
1819
1820               if (clib_bihash_search_16_8
1821                   (&per_thread_data->in2out_ed, &kv0, &value0))
1822                 {
1823                   if (is_output_feature)
1824                     {
1825                       if (PREDICT_FALSE
1826                           (nat44_ed_not_translate_output_feature
1827                            (sm, ip0, ip0->protocol, udp0->src_port,
1828                             udp0->dst_port, thread_index, sw_if_index0,
1829                             vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1830                         {
1831                           reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1832                           nat_ip4_reass_get_frags (reass0,
1833                                                    &fragments_to_loopback);
1834                           goto trace0;
1835                         }
1836
1837                       /*
1838                        * Send DHCP packets to the ipv4 stack, or we won't
1839                        * be able to use dhcp client on the outside interface
1840                        */
1841                       if (PREDICT_FALSE
1842                           ((b0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)
1843                            && proto0 == SNAT_PROTOCOL_UDP
1844                            && (udp0->dst_port ==
1845                                clib_host_to_net_u16
1846                                (UDP_DST_PORT_dhcp_to_server))))
1847                         goto trace0;
1848                     }
1849                   else
1850                     {
1851                       if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1852                                                                  sw_if_index0,
1853                                                                  ip0, proto0,
1854                                                                  rx_fib_index0,
1855                                                                  thread_index)))
1856                         {
1857                           reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1858                           nat_ip4_reass_get_frags (reass0,
1859                                                    &fragments_to_loopback);
1860                           goto trace0;
1861                         }
1862                     }
1863
1864                   next0 = slow_path_ed (sm, b0, rx_fib_index0, &kv0,
1865                                         &s0, node, next0, thread_index, now,
1866                                         tcp0);
1867
1868                   if (PREDICT_FALSE (next0 == NAT_NEXT_DROP))
1869                     goto trace0;
1870
1871                   if (PREDICT_FALSE (!s0))
1872                     {
1873                       reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1874                       goto trace0;
1875                     }
1876
1877                   reass0->sess_index = s0 - per_thread_data->sessions;
1878                 }
1879               else
1880                 {
1881                   s0 = pool_elt_at_index (per_thread_data->sessions,
1882                                           value0.value);
1883                   reass0->sess_index = value0.value;
1884                 }
1885               nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
1886             }
1887           else
1888             {
1889               if (reass0->flags & NAT_REASS_FLAG_ED_DONT_TRANSLATE)
1890                 goto trace0;
1891               if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
1892                 {
1893                   if (nat_ip4_reass_add_fragment
1894                       (thread_index, reass0, bi0, &fragments_to_drop))
1895                     {
1896                       b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_FRAG];
1897                       nat_elog_notice
1898                         ("maximum fragments per reassembly exceeded");
1899                       next0 = NAT_NEXT_DROP;
1900                       goto trace0;
1901                     }
1902                   cached0 = 1;
1903                   goto trace0;
1904                 }
1905               s0 = pool_elt_at_index (per_thread_data->sessions,
1906                                       reass0->sess_index);
1907             }
1908
1909           old_addr0 = ip0->src_address.as_u32;
1910           ip0->src_address = s0->out2in.addr;
1911           new_addr0 = ip0->src_address.as_u32;
1912           if (!is_output_feature)
1913             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1914
1915           sum0 = ip0->checksum;
1916           sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1917                                  ip4_header_t,
1918                                  src_address /* changed member */ );
1919           if (PREDICT_FALSE (is_twice_nat_session (s0)))
1920             sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1921                                    s0->ext_host_addr.as_u32, ip4_header_t,
1922                                    dst_address);
1923           ip0->checksum = ip_csum_fold (sum0);
1924
1925           if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1926             {
1927               old_port0 = udp0->src_port;
1928               new_port0 = udp0->src_port = s0->out2in.port;
1929
1930               if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1931                 {
1932                   sum0 = tcp0->checksum;
1933                   sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1934                                          ip4_header_t,
1935                                          dst_address /* changed member */ );
1936                   sum0 = ip_csum_update (sum0, old_port0, new_port0,
1937                                          ip4_header_t /* cheat */ ,
1938                                          length /* changed member */ );
1939                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1940                     {
1941                       sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1942                                              s0->ext_host_addr.as_u32,
1943                                              ip4_header_t, dst_address);
1944                       sum0 = ip_csum_update (sum0, tcp0->dst_port,
1945                                              s0->ext_host_port, ip4_header_t,
1946                                              length);
1947                       tcp0->dst_port = s0->ext_host_port;
1948                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1949                     }
1950                   tcp0->checksum = ip_csum_fold (sum0);
1951                 }
1952               else if (udp0->checksum)
1953                 {
1954                   sum0 = udp0->checksum;
1955                   sum0 =
1956                     ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1957                                     dst_address);
1958                   sum0 =
1959                     ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1960                                     length);
1961                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1962                     {
1963                       sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1964                                              s0->ext_host_addr.as_u32,
1965                                              ip4_header_t, dst_address);
1966                       sum0 = ip_csum_update (sum0, tcp0->dst_port,
1967                                              s0->ext_host_port, ip4_header_t,
1968                                              length);
1969                       udp0->dst_port = s0->ext_host_port;
1970                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1971                     }
1972                   udp0->checksum = ip_csum_fold (sum0);
1973                 }
1974               else
1975                 {
1976                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1977                     {
1978                       udp0->dst_port = s0->ext_host_port;
1979                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1980                     }
1981                 }
1982             }
1983
1984           /* Hairpinning */
1985           nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port,
1986                                    s0->ext_host_port, proto0, 1);
1987
1988           /* Accounting */
1989           nat44_session_update_counters (s0, now,
1990                                          vlib_buffer_length_in_chain (vm, b0),
1991                                          thread_index);
1992           /* Per-user LRU list maintenance */
1993           nat44_session_update_lru (sm, s0, thread_index);
1994
1995         trace0:
1996           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1997                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1998             {
1999               nat44_reass_trace_t *t =
2000                 vlib_add_trace (vm, node, b0, sizeof (*t));
2001               t->cached = cached0;
2002               t->sw_if_index = sw_if_index0;
2003               t->next_index = next0;
2004             }
2005
2006           if (cached0)
2007             {
2008               n_left_to_next++;
2009               to_next--;
2010               cached_fragments++;
2011             }
2012           else
2013             {
2014               pkts_processed += next0 == nat_buffer_opaque (b0)->arc_next;
2015
2016               /* verify speculative enqueue, maybe switch current next frame */
2017               vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2018                                                to_next, n_left_to_next,
2019                                                bi0, next0);
2020             }
2021
2022           if (n_left_from == 0 && vec_len (fragments_to_loopback))
2023             {
2024               from = vlib_frame_vector_args (frame);
2025               u32 len = vec_len (fragments_to_loopback);
2026               if (len <= VLIB_FRAME_SIZE)
2027                 {
2028                   clib_memcpy_fast (from, fragments_to_loopback,
2029                                     sizeof (u32) * len);
2030                   n_left_from = len;
2031                   vec_reset_length (fragments_to_loopback);
2032                 }
2033               else
2034                 {
2035                   clib_memcpy_fast (from, fragments_to_loopback +
2036                                     (len - VLIB_FRAME_SIZE),
2037                                     sizeof (u32) * VLIB_FRAME_SIZE);
2038                   n_left_from = VLIB_FRAME_SIZE;
2039                   _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
2040                 }
2041             }
2042         }
2043
2044       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2045     }
2046
2047   vlib_node_increment_counter (vm, sm->ed_in2out_reass_node_index,
2048                                NAT_IN2OUT_ED_ERROR_PROCESSED_FRAGMENTS,
2049                                pkts_processed);
2050   vlib_node_increment_counter (vm, sm->ed_in2out_reass_node_index,
2051                                NAT_IN2OUT_ED_ERROR_CACHED_FRAGMENTS,
2052                                cached_fragments);
2053
2054   nat_send_all_to_node (vm, fragments_to_drop, node,
2055                         &node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT],
2056                         NAT_NEXT_DROP);
2057
2058   vec_free (fragments_to_drop);
2059   vec_free (fragments_to_loopback);
2060   return frame->n_vectors;
2061 }
2062
2063 VLIB_NODE_FN (nat44_ed_in2out_node) (vlib_main_t * vm,
2064                                      vlib_node_runtime_t * node,
2065                                      vlib_frame_t * frame)
2066 {
2067   return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 0);
2068 }
2069
2070 /* *INDENT-OFF* */
2071 VLIB_REGISTER_NODE (nat44_ed_in2out_node) = {
2072   .name = "nat44-ed-in2out",
2073   .vector_size = sizeof (u32),
2074   .sibling_of = "nat-default",
2075   .format_trace = format_nat_in2out_ed_trace,
2076   .type = VLIB_NODE_TYPE_INTERNAL,
2077   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2078   .error_strings = nat_in2out_ed_error_strings,
2079   .runtime_data_bytes = sizeof (snat_runtime_t),
2080 };
2081 /* *INDENT-ON* */
2082
2083 VLIB_NODE_FN (nat44_ed_in2out_output_node) (vlib_main_t * vm,
2084                                             vlib_node_runtime_t * node,
2085                                             vlib_frame_t * frame)
2086 {
2087   return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 1);
2088 }
2089
2090 /* *INDENT-OFF* */
2091 VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = {
2092   .name = "nat44-ed-in2out-output",
2093   .vector_size = sizeof (u32),
2094   .sibling_of = "nat-default",
2095   .format_trace = format_nat_in2out_ed_trace,
2096   .type = VLIB_NODE_TYPE_INTERNAL,
2097   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2098   .error_strings = nat_in2out_ed_error_strings,
2099   .runtime_data_bytes = sizeof (snat_runtime_t),
2100 };
2101 /* *INDENT-ON* */
2102
2103 VLIB_NODE_FN (nat44_ed_in2out_slowpath_node) (vlib_main_t * vm,
2104                                               vlib_node_runtime_t * node,
2105                                               vlib_frame_t * frame)
2106 {
2107   return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 0);
2108 }
2109
2110 /* *INDENT-OFF* */
2111 VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = {
2112   .name = "nat44-ed-in2out-slowpath",
2113   .vector_size = sizeof (u32),
2114   .sibling_of = "nat-default",
2115   .format_trace = format_nat_in2out_ed_trace,
2116   .type = VLIB_NODE_TYPE_INTERNAL,
2117   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2118   .error_strings = nat_in2out_ed_error_strings,
2119   .runtime_data_bytes = sizeof (snat_runtime_t),
2120 };
2121 /* *INDENT-ON* */
2122
2123 VLIB_NODE_FN (nat44_ed_in2out_output_slowpath_node) (vlib_main_t * vm,
2124                                                      vlib_node_runtime_t *
2125                                                      node,
2126                                                      vlib_frame_t * frame)
2127 {
2128   return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 1);
2129 }
2130
2131 /* *INDENT-OFF* */
2132 VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = {
2133   .name = "nat44-ed-in2out-output-slowpath",
2134   .vector_size = sizeof (u32),
2135   .sibling_of = "nat-default",
2136   .format_trace = format_nat_in2out_ed_trace,
2137   .type = VLIB_NODE_TYPE_INTERNAL,
2138   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2139   .error_strings = nat_in2out_ed_error_strings,
2140   .runtime_data_bytes = sizeof (snat_runtime_t),
2141 };
2142 /* *INDENT-ON* */
2143
2144
2145 VLIB_NODE_FN (nat44_ed_in2out_reass_node) (vlib_main_t * vm,
2146                                            vlib_node_runtime_t * node,
2147                                            vlib_frame_t * frame)
2148 {
2149   return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 0);
2150 }
2151
2152 /* *INDENT-OFF* */
2153 VLIB_REGISTER_NODE (nat44_ed_in2out_reass_node) = {
2154   .name = "nat44-ed-in2out-reass",
2155   .vector_size = sizeof (u32),
2156   .sibling_of = "nat-default",
2157   .format_trace = format_nat44_reass_trace,
2158   .type = VLIB_NODE_TYPE_INTERNAL,
2159   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2160   .error_strings = nat_in2out_ed_error_strings,
2161 };
2162 /* *INDENT-ON* */
2163
2164 VLIB_NODE_FN (nat44_ed_in2out_reass_output_node) (vlib_main_t * vm,
2165                                                   vlib_node_runtime_t * node,
2166                                                   vlib_frame_t * frame)
2167 {
2168   return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 1);
2169 }
2170
2171 /* *INDENT-OFF* */
2172 VLIB_REGISTER_NODE (nat44_ed_in2out_reass_output_node) = {
2173   .name = "nat44-ed-in2out-reass-output",
2174   .vector_size = sizeof (u32),
2175   .sibling_of = "nat-default",
2176   .format_trace = format_nat44_reass_trace,
2177   .type = VLIB_NODE_TYPE_INTERNAL,
2178   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2179   .error_strings = nat_in2out_ed_error_strings,
2180 };
2181 /* *INDENT-ON* */
2182
2183 static u8 *
2184 format_nat_pre_trace (u8 * s, va_list * args)
2185 {
2186   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2187   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2188   nat_pre_trace_t *t = va_arg (*args, nat_pre_trace_t *);
2189   return format (s, "in2out next_index %d", t->next_index);
2190 }
2191
2192 VLIB_NODE_FN (nat_pre_in2out_node) (vlib_main_t * vm,
2193                                     vlib_node_runtime_t * node,
2194                                     vlib_frame_t * frame)
2195 {
2196   return nat_pre_node_fn_inline (vm, node, frame,
2197                                  NAT_NEXT_IN2OUT_ED_FAST_PATH);
2198 }
2199
2200 /* *INDENT-OFF* */
2201 VLIB_REGISTER_NODE (nat_pre_in2out_node) = {
2202   .name = "nat-pre-in2out",
2203   .vector_size = sizeof (u32),
2204   .sibling_of = "nat-default",
2205   .format_trace = format_nat_pre_trace,
2206   .type = VLIB_NODE_TYPE_INTERNAL,
2207   .n_errors = 0,
2208 };
2209 /* *INDENT-ON* */
2210
2211 /*
2212  * fd.io coding-style-patch-verification: ON
2213  *
2214  * Local Variables:
2215  * eval: (c-set-style "gnu")
2216  * End:
2217  */