src/plugins/nat/in2out_ed.c

   1 /*
   2  * Copyright (c) 2018 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 /**
  16  * @file
  17  * @brief NAT44 endpoint-dependent inside to outside network translation
  18  */
  19
  20 #include <vlib/vlib.h>
  21 #include <vnet/vnet.h>
  22 #include <vnet/pg/pg.h>
  23 #include <vnet/ip/ip.h>
  24 #include <vnet/ethernet/ethernet.h>
  25 #include <vnet/fib/ip4_fib.h>
  26 #include <vnet/udp/udp.h>
  27 #include <vppinfra/error.h>
  28 #include <nat/nat.h>
  29 #include <nat/nat_ipfix_logging.h>
  30 #include <nat/nat_inlines.h>
  31 #include <nat/nat44/inlines.h>
  32 #include <nat/nat_syslog.h>
  33 #include <nat/nat_ha.h>
  34
  35 static char *nat_in2out_ed_error_strings[] = {
  36 #define _(sym,string) string,
  37   foreach_nat_in2out_ed_error
  38 #undef _
  39 };
  40
  41 typedef struct
  42 {
  43   u32 sw_if_index;
  44   u32 next_index;
  45   u32 session_index;
  46   u32 is_slow_path;
  47 } nat_in2out_ed_trace_t;
  48
  49 static u8 *
  50 format_nat_in2out_ed_trace (u8 * s, va_list * args)
  51 {
  52   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  53   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  54   nat_in2out_ed_trace_t *t = va_arg (*args, nat_in2out_ed_trace_t *);
  55   char *tag;
  56
  57   tag =
  58     t->is_slow_path ? "NAT44_IN2OUT_ED_SLOW_PATH" :
  59     "NAT44_IN2OUT_ED_FAST_PATH";
  60
  61   s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
  62               t->sw_if_index, t->next_index, t->session_index);
  63
  64   return s;
  65 }
  66
  67 #ifndef CLIB_MARCH_VARIANT
  68 int
  69 nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
  70 {
  71   snat_main_t *sm = &snat_main;
  72   nat44_is_idle_session_ctx_t *ctx = arg;
  73   snat_session_t *s;
  74   u64 sess_timeout_time;
  75   u8 proto;
  76   u16 r_port, l_port;
  77   ip4_address_t *l_addr, *r_addr;
  78   u32 fib_index;
  79   clib_bihash_kv_16_8_t ed_kv;
  80   int i;
  81   snat_address_t *a;
  82   snat_session_key_t key;
  83   snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
  84                                                        ctx->thread_index);
  85
  86   s = pool_elt_at_index (tsm->sessions, kv->value);
  87   sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
  88   if (ctx->now >= sess_timeout_time)
  89     {
  90       if (is_fwd_bypass_session (s))
  91         goto delete;
  92
  93       l_addr = &s->out2in.addr;
  94       r_addr = &s->ext_host_addr;
  95       fib_index = s->out2in.fib_index;
  96       if (snat_is_unk_proto_session (s))
  97         {
  98           proto = s->in2out.port;
  99           r_port = 0;
 100           l_port = 0;
 101         }
 102       else
 103         {
 104           proto = snat_proto_to_ip_proto (s->in2out.protocol);
 105           l_port = s->out2in.port;
 106           r_port = s->ext_host_port;
 107         }
 108       make_ed_kv (l_addr, r_addr, proto, fib_index, l_port, r_port, ~0ULL,
 109                   &ed_kv);
 110       if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &ed_kv, 0))
 111         nat_elog_warn ("out2in_ed key del failed");
 112
 113       if (snat_is_unk_proto_session (s))
 114         goto delete;
 115
 116       snat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
 117                                            s->in2out.addr.as_u32,
 118                                            s->out2in.addr.as_u32,
 119                                            s->in2out.protocol,
 120                                            s->in2out.port,
 121                                            s->out2in.port,
 122                                            s->in2out.fib_index);
 123
 124       nat_syslog_nat44_sdel (s->user_index, s->in2out.fib_index,
 125                              &s->in2out.addr, s->in2out.port,
 126                              &s->ext_host_nat_addr, s->ext_host_nat_port,
 127                              &s->out2in.addr, s->out2in.port,
 128                              &s->ext_host_addr, s->ext_host_port,
 129                              s->in2out.protocol, is_twice_nat_session (s));
 130
 131       nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
 132                    s->ext_host_port, s->out2in.protocol, s->out2in.fib_index,
 133                    ctx->thread_index);
 134
 135       if (is_twice_nat_session (s))
 136         {
 137           for (i = 0; i < vec_len (sm->twice_nat_addresses); i++)
 138             {
 139               key.protocol = s->in2out.protocol;
 140               key.port = s->ext_host_nat_port;
 141               a = sm->twice_nat_addresses + i;
 142               if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
 143                 {
 144                   snat_free_outside_address_and_port (sm->twice_nat_addresses,
 145                                                       ctx->thread_index,
 146                                                       &key);
 147                   break;
 148                 }
 149             }
 150         }
 151
 152       if (snat_is_session_static (s))
 153         goto delete;
 154
 155       snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
 156                                           &s->out2in);
 157     delete:
 158       nat44_ed_delete_session (sm, s, ctx->thread_index, 1);
 159       return 1;
 160     }
 161
 162   return 0;
 163 }
 164 #endif
 165
 166 static inline u32
 167 icmp_in2out_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
 168                           ip4_header_t * ip0, icmp46_header_t * icmp0,
 169                           u32 sw_if_index0, u32 rx_fib_index0,
 170                           vlib_node_runtime_t * node, u32 next0, f64 now,
 171                           u32 thread_index, snat_session_t ** p_s0)
 172 {
 173   next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
 174                        next0, thread_index, p_s0, 0);
 175   snat_session_t *s0 = *p_s0;
 176   if (PREDICT_TRUE (next0 != NAT_NEXT_DROP && s0))
 177     {
 178       /* Accounting */
 179       nat44_session_update_counters (s0, now,
 180                                      vlib_buffer_length_in_chain
 181                                      (sm->vlib_main, b0), thread_index);
 182       /* Per-user LRU list maintenance */
 183       nat44_session_update_lru (sm, s0, thread_index);
 184     }
 185   return next0;
 186 }
 187
 188 static_always_inline u16
 189 snat_random_port (u16 min, u16 max)
 190 {
 191   snat_main_t *sm = &snat_main;
 192   return min + random_u32 (&sm->random_seed) /
 193     (random_u32_max () / (max - min + 1) + 1);
 194 }
 195
 196 static int
 197 nat_ed_alloc_addr_and_port (snat_main_t * sm, u32 rx_fib_index,
 198                             u32 snat_proto, u32 thread_index,
 199                             ip4_address_t r_addr, u16 r_port, u8 proto,
 200                             u16 port_per_thread, u32 snat_thread_index,
 201                             snat_session_t * s,
 202                             ip4_address_t * allocated_addr,
 203                             u16 * allocated_port,
 204                             clib_bihash_kv_16_8_t * out2in_ed_kv)
 205 {
 206   int i;
 207   snat_address_t *a, *ga = 0;
 208   u32 portnum;
 209   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 210
 211   const u16 port_thread_offset = (port_per_thread * snat_thread_index) + 1024;
 212
 213   for (i = 0; i < vec_len (sm->addresses); i++)
 214     {
 215       a = sm->addresses + i;
 216       switch (snat_proto)
 217         {
 218 #define _(N, j, n, unused)                                                    \
 219   case SNAT_PROTOCOL_##N:                                                     \
 220     if (a->fib_index == rx_fib_index)                                         \
 221       {                                                                       \
 222         u16 port = snat_random_port (1, port_per_thread);                     \
 223         u16 attempts = port_per_thread;                                       \
 224         while (attempts > 0)                                                  \
 225           {                                                                   \
 226             --attempts;                                                       \
 227             portnum = port_thread_offset + port;                              \
 228             make_ed_kv (&a->addr, &r_addr, proto, s->out2in.fib_index,        \
 229                         clib_host_to_net_u16 (portnum), r_port,               \
 230                         s - tsm->sessions, out2in_ed_kv);                     \
 231             int rv = clib_bihash_add_del_16_8 (&tsm->out2in_ed, out2in_ed_kv, \
 232                                                2 /* is_add */);               \
 233             if (0 == rv)                                                      \
 234               {                                                               \
 235                 ++a->busy_##n##_port_refcounts[portnum];                      \
 236                 a->busy_##n##_ports_per_thread[thread_index]++;               \
 237                 a->busy_##n##_ports++;                                        \
 238                 *allocated_addr = a->addr;                                    \
 239                 *allocated_port = clib_host_to_net_u16 (portnum);             \
 240                 return 0;                                                     \
 241               }                                                               \
 242             port = (port + 1) % port_per_thread;                              \
 243           }                                                                   \
 244       }                                                                       \
 245     else if (a->fib_index == ~0)                                              \
 246       {                                                                       \
 247         ga = a;                                                               \
 248       }                                                                       \
 249     break;
 250
 251           foreach_snat_protocol;
 252         default:
 253           nat_elog_info ("unknown protocol");
 254           return 1;
 255         }
 256     }
 257
 258   if (ga)
 259     {
 260       /* fake fib_index to reuse macro */
 261       rx_fib_index = ~0;
 262       a = ga;
 263       switch (snat_proto)
 264         {
 265           foreach_snat_protocol;
 266         default:
 267           nat_elog_info ("unknown protocol");
 268           return 1;
 269         }
 270     }
 271
 272 #undef _
 273
 274   /* Totally out of translations to use... */
 275   snat_ipfix_logging_addresses_exhausted (thread_index, 0);
 276   return 1;
 277 }
 278
 279 static u32
 280 slow_path_ed (snat_main_t * sm,
 281               vlib_buffer_t * b,
 282               ip4_address_t l_addr,
 283               ip4_address_t r_addr,
 284               u16 l_port,
 285               u16 r_port,
 286               u8 proto,
 287               u32 rx_fib_index,
 288               snat_session_t ** sessionp,
 289               vlib_node_runtime_t * node, u32 next, u32 thread_index, f64 now)
 290 {
 291   snat_session_t *s = NULL;
 292   snat_session_key_t key0, key1;
 293   lb_nat_type_t lb = 0;
 294   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 295   u32 snat_proto = ip_proto_to_snat_proto (proto);
 296   nat_outside_fib_t *outside_fib;
 297   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
 298   clib_bihash_kv_16_8_t out2in_ed_kv;
 299   ip4_address_t allocated_addr;
 300   u16 allocated_port;
 301   u8 identity_nat;
 302   fib_prefix_t pfx = {
 303     .fp_proto = FIB_PROTOCOL_IP4,
 304     .fp_len = 32,
 305     .fp_addr = {.ip4.as_u32 = r_addr.as_u32,},
 306   };
 307   nat44_is_idle_session_ctx_t ctx;
 308
 309   if (PREDICT_TRUE (snat_proto == SNAT_PROTOCOL_TCP))
 310     {
 311       if (PREDICT_FALSE
 312           (!tcp_flags_is_init
 313            (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)))
 314         {
 315           b->error = node->errors[NAT_IN2OUT_ED_ERROR_NON_SYN];
 316           return NAT_NEXT_DROP;
 317         }
 318     }
 319
 320   // TODO: based on fib index do a lookup
 321   if (PREDICT_FALSE
 322       (nat44_ed_maximum_sessions_exceeded (sm, rx_fib_index, thread_index)))
 323     {
 324       if (!nat_global_lru_free_one (sm, thread_index, now))
 325         {
 326           b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
 327           nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
 328           nat_elog_notice ("maximum sessions exceeded");
 329           return NAT_NEXT_DROP;
 330         }
 331     }
 332
 333   key0.addr = l_addr;
 334   key0.port = l_port;
 335   key1.protocol = key0.protocol = snat_proto;
 336   key0.fib_index = rx_fib_index;
 337   key1.fib_index = sm->outside_fib_index;
 338
 339   /* First try to match static mapping by local address and port */
 340   if (snat_static_mapping_match
 341       (sm, key0, &key1, 0, 0, 0, &lb, 0, &identity_nat))
 342     {
 343       s = nat_ed_session_alloc (sm, thread_index, now);
 344       if (!s)
 345         {
 346           nat_elog_warn ("create NAT session failed");
 347           b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_USER_SESS_EXCEEDED];
 348           return NAT_NEXT_DROP;
 349         }
 350       switch (vec_len (sm->outside_fibs))
 351         {
 352         case 0:
 353           s->out2in.fib_index = sm->outside_fib_index;
 354           break;
 355         case 1:
 356           s->out2in.fib_index = sm->outside_fibs[0].fib_index;
 357           break;
 358         default:
 359           /* *INDENT-OFF* */
 360           vec_foreach (outside_fib, sm->outside_fibs)
 361           {
 362             fei = fib_table_lookup (outside_fib->fib_index, &pfx);
 363             if (FIB_NODE_INDEX_INVALID != fei)
 364               {
 365                 if (fib_entry_get_resolving_interface (fei) != ~0)
 366                   {
 367                     s->out2in.fib_index = outside_fib->fib_index;
 368                     break;
 369                   }
 370               }
 371           }
 372           /* *INDENT-ON* */
 373           break;
 374         }
 375
 376       /* Try to create dynamic translation */
 377       if (nat_ed_alloc_addr_and_port (sm, rx_fib_index, snat_proto,
 378                                       thread_index, r_addr, r_port, proto,
 379                                       sm->port_per_thread,
 380                                       tsm->snat_thread_index, s,
 381                                       &allocated_addr,
 382                                       &allocated_port, &out2in_ed_kv))
 383         {
 384           nat_elog_notice ("addresses exhausted");
 385           b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS];
 386           nat_free_session_data (sm, s, thread_index, 0);
 387           nat44_ed_delete_session (sm, s, thread_index, 1);
 388           return NAT_NEXT_DROP;
 389         }
 390       key1.addr = allocated_addr;
 391       key1.port = allocated_port;
 392     }
 393   else
 394     {
 395       if (PREDICT_FALSE (identity_nat))
 396         {
 397           *sessionp = s;
 398           return next;
 399         }
 400       s = nat_ed_session_alloc (sm, thread_index, now);
 401       if (!s)
 402         {
 403           nat_elog_warn ("create NAT session failed");
 404           b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_USER_SESS_EXCEEDED];
 405           return NAT_NEXT_DROP;
 406         }
 407       switch (vec_len (sm->outside_fibs))
 408         {
 409         case 0:
 410           s->out2in.fib_index = sm->outside_fib_index;
 411           break;
 412         case 1:
 413           s->out2in.fib_index = sm->outside_fibs[0].fib_index;
 414           break;
 415         default:
 416           /* *INDENT-OFF* */
 417           vec_foreach (outside_fib, sm->outside_fibs)
 418           {
 419             fei = fib_table_lookup (outside_fib->fib_index, &pfx);
 420             if (FIB_NODE_INDEX_INVALID != fei)
 421               {
 422                 if (fib_entry_get_resolving_interface (fei) != ~0)
 423                   {
 424                     s->out2in.fib_index = outside_fib->fib_index;
 425                     break;
 426                   }
 427               }
 428           }
 429           /* *INDENT-ON* */
 430           break;
 431         }
 432
 433       s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
 434
 435
 436       make_ed_kv (&key1.addr, &r_addr, proto,
 437                   s->out2in.fib_index, key1.port, r_port, s - tsm->sessions,
 438                   &out2in_ed_kv);
 439       if (clib_bihash_add_or_overwrite_stale_16_8
 440           (&tsm->out2in_ed, &out2in_ed_kv, nat44_o2i_ed_is_idle_session_cb,
 441            &ctx))
 442         nat_elog_notice ("out2in-ed key add failed");
 443     }
 444
 445   if (lb)
 446     s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
 447   s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
 448   s->ext_host_addr = r_addr;
 449   s->ext_host_port = r_port;
 450   s->in2out = key0;
 451   s->out2in = key1;
 452   s->out2in.protocol = key0.protocol;
 453
 454   clib_bihash_kv_16_8_t in2out_ed_kv;
 455   make_ed_kv (&l_addr, &r_addr, proto, rx_fib_index, l_port, r_port,
 456               s - tsm->sessions, &in2out_ed_kv);
 457   ctx.now = now;
 458   ctx.thread_index = thread_index;
 459   if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, &in2out_ed_kv,
 460                                                nat44_i2o_ed_is_idle_session_cb,
 461                                                &ctx))
 462     nat_elog_notice ("in2out-ed key add failed");
 463
 464   *sessionp = s;
 465
 466   /* log NAT event */
 467   snat_ipfix_logging_nat44_ses_create (thread_index,
 468                                        s->in2out.addr.as_u32,
 469                                        s->out2in.addr.as_u32,
 470                                        s->in2out.protocol,
 471                                        s->in2out.port,
 472                                        s->out2in.port, s->in2out.fib_index);
 473
 474   nat_syslog_nat44_sadd (s->user_index, s->in2out.fib_index,
 475                          &s->in2out.addr, s->in2out.port,
 476                          &s->ext_host_nat_addr, s->ext_host_nat_port,
 477                          &s->out2in.addr, s->out2in.port,
 478                          &s->ext_host_addr, s->ext_host_port,
 479                          s->in2out.protocol, 0);
 480
 481   nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
 482                s->out2in.port, &s->ext_host_addr, s->ext_host_port,
 483                &s->ext_host_nat_addr, s->ext_host_nat_port,
 484                s->in2out.protocol, s->in2out.fib_index, s->flags,
 485                thread_index, 0);
 486
 487   return next;
 488 }
 489
 490 static_always_inline int
 491 nat44_ed_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
 492                         u32 sw_if_index, ip4_header_t * ip, u32 proto,
 493                         u32 rx_fib_index, u32 thread_index)
 494 {
 495   udp_header_t *udp = ip4_next_header (ip);
 496   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 497   clib_bihash_kv_16_8_t kv, value;
 498   snat_session_key_t key0, key1;
 499
 500   make_ed_kv (&ip->dst_address, &ip->src_address, ip->protocol,
 501               sm->outside_fib_index, udp->dst_port, udp->src_port, ~0ULL,
 502               &kv);
 503
 504   /* NAT packet aimed at external address if has active sessions */
 505   if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
 506     {
 507       key0.addr = ip->dst_address;
 508       key0.port = udp->dst_port;
 509       key0.protocol = proto;
 510       key0.fib_index = sm->outside_fib_index;
 511       /* or is static mappings */
 512       if (!snat_static_mapping_match (sm, key0, &key1, 1, 0, 0, 0, 0, 0))
 513         return 0;
 514     }
 515   else
 516     return 0;
 517
 518   if (sm->forwarding_enabled)
 519     return 1;
 520
 521   return snat_not_translate_fast (sm, node, sw_if_index, ip, proto,
 522                                   rx_fib_index);
 523 }
 524
 525 static_always_inline int
 526 nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip,
 527                                       u32 thread_index, f64 now,
 528                                       vlib_main_t * vm, vlib_buffer_t * b)
 529 {
 530   clib_bihash_kv_16_8_t kv, value;
 531   snat_session_t *s = 0;
 532   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 533
 534   if (!sm->forwarding_enabled)
 535     return 0;
 536
 537   if (ip->protocol == IP_PROTOCOL_ICMP)
 538     {
 539       if (get_icmp_i2o_ed_key (b, ip, 0, ~0ULL, 0, 0, 0, &kv))
 540         return 0;
 541     }
 542   else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
 543     {
 544       make_ed_kv (&ip->src_address, &ip->dst_address, ip->protocol, 0,
 545                   vnet_buffer (b)->ip.reass.l4_src_port,
 546                   vnet_buffer (b)->ip.reass.l4_dst_port, ~0ULL, &kv);
 547     }
 548   else
 549     {
 550       make_ed_kv (&ip->src_address, &ip->dst_address, ip->protocol, 0, 0,
 551                   0, ~0ULL, &kv);
 552     }
 553
 554   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 555     {
 556       s = pool_elt_at_index (tsm->sessions, value.value);
 557       if (is_fwd_bypass_session (s))
 558         {
 559           if (ip->protocol == IP_PROTOCOL_TCP)
 560             {
 561               if (nat44_set_tcp_session_state_i2o
 562                   (sm, now, s, b, thread_index))
 563                 return 1;
 564             }
 565           /* Accounting */
 566           nat44_session_update_counters (s, now,
 567                                          vlib_buffer_length_in_chain (vm, b),
 568                                          thread_index);
 569           /* Per-user LRU list maintenance */
 570           nat44_session_update_lru (sm, s, thread_index);
 571           return 1;
 572         }
 573       else
 574         return 0;
 575     }
 576
 577   return 0;
 578 }
 579
 580 static_always_inline int
 581 nat44_ed_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip,
 582                                        u16 src_port, u16 dst_port,
 583                                        u32 thread_index, u32 rx_sw_if_index,
 584                                        u32 tx_sw_if_index)
 585 {
 586   clib_bihash_kv_16_8_t kv, value;
 587   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 588   snat_interface_t *i;
 589   snat_session_t *s;
 590   u32 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (rx_sw_if_index);
 591   u32 tx_fib_index = ip4_fib_table_get_index_for_sw_if_index (tx_sw_if_index);
 592
 593   /* src NAT check */
 594   make_ed_kv (&ip->src_address, &ip->dst_address, ip->protocol,
 595               tx_fib_index, src_port, dst_port, ~0ULL, &kv);
 596   if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
 597     {
 598       s = pool_elt_at_index (tsm->sessions, value.value);
 599       if (nat44_is_ses_closed (s))
 600         {
 601           nat_free_session_data (sm, s, thread_index, 0);
 602           nat44_ed_delete_session (sm, s, thread_index, 1);
 603         }
 604       else
 605         s->flags |= SNAT_SESSION_FLAG_OUTPUT_FEATURE;
 606       return 1;
 607     }
 608
 609   /* dst NAT check */
 610   make_ed_kv (&ip->dst_address, &ip->src_address, ip->protocol,
 611               rx_fib_index, dst_port, src_port, ~0ULL, &kv);
 612   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 613     {
 614       s = pool_elt_at_index (tsm->sessions, value.value);
 615       if (is_fwd_bypass_session (s))
 616         return 0;
 617
 618       /* hairpinning */
 619       /* *INDENT-OFF* */
 620       pool_foreach (i, sm->output_feature_interfaces,
 621       ({
 622         if ((nat_interface_is_inside (i)) && (rx_sw_if_index == i->sw_if_index))
 623            return 0;
 624       }));
 625       /* *INDENT-ON* */
 626       return 1;
 627     }
 628
 629   return 0;
 630 }
 631
 632 #ifndef CLIB_MARCH_VARIANT
 633 u32
 634 icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node,
 635                       u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip,
 636                       u8 * p_proto, snat_session_key_t * p_value,
 637                       u8 * p_dont_translate, void *d, void *e)
 638 {
 639   u32 sw_if_index;
 640   u32 rx_fib_index;
 641   snat_session_t *s = 0;
 642   u8 dont_translate = 0;
 643   clib_bihash_kv_16_8_t kv, value;
 644   u32 next = ~0;
 645   int err;
 646   u16 l_port = 0, r_port = 0;   // initialize to workaround gcc warning
 647   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 648
 649   sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
 650   rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
 651
 652   err =
 653     get_icmp_i2o_ed_key (b, ip, rx_fib_index, ~0ULL, p_proto, &l_port,
 654                          &r_port, &kv);
 655   if (err != 0)
 656     {
 657       b->error = node->errors[err];
 658       next = NAT_NEXT_DROP;
 659       goto out;
 660     }
 661
 662   if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 663     {
 664       if (vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0)
 665         {
 666           if (PREDICT_FALSE
 667               (nat44_ed_not_translate_output_feature
 668                (sm, ip, l_port, r_port, thread_index,
 669                 sw_if_index, vnet_buffer (b)->sw_if_index[VLIB_TX])))
 670             {
 671               dont_translate = 1;
 672               goto out;
 673             }
 674         }
 675       else
 676         {
 677           if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index,
 678                                                      ip, SNAT_PROTOCOL_ICMP,
 679                                                      rx_fib_index,
 680                                                      thread_index)))
 681             {
 682               dont_translate = 1;
 683               goto out;
 684             }
 685         }
 686
 687       if (PREDICT_FALSE
 688           (icmp_type_is_error_message
 689            (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)))
 690         {
 691           b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
 692           next = NAT_NEXT_DROP;
 693           goto out;
 694         }
 695
 696       next =
 697         slow_path_ed (sm, b, ip->src_address, ip->dst_address, l_port, r_port,
 698                       ip->protocol, rx_fib_index, &s, node, next,
 699                       thread_index, vlib_time_now (sm->vlib_main));
 700
 701       if (PREDICT_FALSE (next == NAT_NEXT_DROP))
 702         goto out;
 703
 704       if (!s)
 705         {
 706           dont_translate = 1;
 707           goto out;
 708         }
 709     }
 710   else
 711     {
 712       if (PREDICT_FALSE
 713           (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
 714            ICMP4_echo_request
 715            && vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
 716            ICMP4_echo_reply
 717            && !icmp_type_is_error_message (vnet_buffer (b)->ip.
 718                                            reass.icmp_type_or_tcp_flags)))
 719         {
 720           b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
 721           next = NAT_NEXT_DROP;
 722           goto out;
 723         }
 724
 725       s = pool_elt_at_index (tsm->sessions, value.value);
 726     }
 727 out:
 728   if (s)
 729     *p_value = s->out2in;
 730   *p_dont_translate = dont_translate;
 731   if (d)
 732     *(snat_session_t **) d = s;
 733   return next;
 734 }
 735 #endif
 736
 737 static snat_session_t *
 738 nat44_ed_in2out_unknown_proto (snat_main_t * sm,
 739                                vlib_buffer_t * b,
 740                                ip4_header_t * ip,
 741                                u32 rx_fib_index,
 742                                u32 thread_index,
 743                                f64 now,
 744                                vlib_main_t * vm, vlib_node_runtime_t * node)
 745 {
 746   clib_bihash_kv_8_8_t kv, value;
 747   clib_bihash_kv_16_8_t s_kv, s_value;
 748   snat_static_mapping_t *m;
 749   u32 old_addr, new_addr = 0;
 750   ip_csum_t sum;
 751   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 752   snat_session_t *s;
 753   u32 outside_fib_index = sm->outside_fib_index;
 754   int i;
 755   u8 is_sm = 0;
 756   nat_outside_fib_t *outside_fib;
 757   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
 758   fib_prefix_t pfx = {
 759     .fp_proto = FIB_PROTOCOL_IP4,
 760     .fp_len = 32,
 761     .fp_addr = {
 762                 .ip4.as_u32 = ip->dst_address.as_u32,
 763                 },
 764   };
 765
 766   switch (vec_len (sm->outside_fibs))
 767     {
 768     case 0:
 769       outside_fib_index = sm->outside_fib_index;
 770       break;
 771     case 1:
 772       outside_fib_index = sm->outside_fibs[0].fib_index;
 773       break;
 774     default:
 775       /* *INDENT-OFF* */
 776       vec_foreach (outside_fib, sm->outside_fibs)
 777         {
 778           fei = fib_table_lookup (outside_fib->fib_index, &pfx);
 779           if (FIB_NODE_INDEX_INVALID != fei)
 780             {
 781               if (fib_entry_get_resolving_interface (fei) != ~0)
 782                 {
 783                   outside_fib_index = outside_fib->fib_index;
 784                   break;
 785                 }
 786             }
 787         }
 788       /* *INDENT-ON* */
 789       break;
 790     }
 791   old_addr = ip->src_address.as_u32;
 792
 793   make_ed_kv (&ip->src_address, &ip->dst_address, ip->protocol,
 794               rx_fib_index, 0, 0, ~0ULL, &s_kv);
 795
 796   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &s_kv, &s_value))
 797     {
 798       s = pool_elt_at_index (tsm->sessions, s_value.value);
 799       new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
 800     }
 801   else
 802     {
 803       if (PREDICT_FALSE
 804           (nat44_ed_maximum_sessions_exceeded
 805            (sm, rx_fib_index, thread_index)))
 806         {
 807           b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
 808           nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
 809           nat_elog_notice ("maximum sessions exceeded");
 810           return 0;
 811         }
 812
 813       make_sm_kv (&kv, &ip->src_address, 0, rx_fib_index, 0);
 814
 815       /* Try to find static mapping first */
 816       if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
 817         {
 818           m = pool_elt_at_index (sm->static_mappings, value.value);
 819           new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
 820           is_sm = 1;
 821           goto create_ses;
 822         }
 823       else
 824         {
 825           /* *INDENT-OFF* */
 826           pool_foreach (s, tsm->sessions, {
 827             if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
 828               {
 829                 new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
 830
 831                 make_ed_kv (&s->out2in.addr, &ip->dst_address, ip->protocol,
 832                             outside_fib_index, 0, 0, ~0ULL, &s_kv);
 833                 if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
 834                   goto create_ses;
 835
 836                 break;
 837               }
 838           });
 839           /* *INDENT-ON* */
 840
 841           for (i = 0; i < vec_len (sm->addresses); i++)
 842             {
 843               make_ed_kv (&sm->addresses[i].addr, &ip->dst_address,
 844                           ip->protocol, outside_fib_index, 0, 0, ~0ULL,
 845                           &s_kv);
 846               if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
 847                 {
 848                   new_addr = ip->src_address.as_u32 =
 849                     sm->addresses[i].addr.as_u32;
 850                   goto create_ses;
 851                 }
 852             }
 853           return 0;
 854         }
 855
 856     create_ses:
 857       s = nat_ed_session_alloc (sm, thread_index, now);
 858       if (!s)
 859         {
 860           b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_USER_SESS_EXCEEDED];
 861           nat_elog_warn ("create NAT session failed");
 862           return 0;
 863         }
 864
 865       s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
 866       s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
 867       s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
 868       s->out2in.addr.as_u32 = new_addr;
 869       s->out2in.fib_index = outside_fib_index;
 870       s->in2out.addr.as_u32 = old_addr;
 871       s->in2out.fib_index = rx_fib_index;
 872       s->in2out.port = s->out2in.port = ip->protocol;
 873       if (is_sm)
 874         s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
 875
 876       /* Add to lookup tables */
 877       make_ed_kv (&s->in2out.addr, &ip->dst_address, ip->protocol,
 878                   rx_fib_index, 0, 0, s - tsm->sessions, &s_kv);
 879       if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1))
 880         nat_elog_notice ("in2out key add failed");
 881
 882       make_ed_kv (&s->out2in.addr, &ip->dst_address, ip->protocol,
 883                   outside_fib_index, 0, 0, s - tsm->sessions, &s_kv);
 884       if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1))
 885         nat_elog_notice ("out2in key add failed");
 886     }
 887
 888   /* Update IP checksum */
 889   sum = ip->checksum;
 890   sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
 891   ip->checksum = ip_csum_fold (sum);
 892
 893   /* Accounting */
 894   nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b),
 895                                  thread_index);
 896   /* Per-user LRU list maintenance */
 897   nat44_session_update_lru (sm, s, thread_index);
 898
 899   /* Hairpinning */
 900   if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
 901     nat44_ed_hairpinning_unknown_proto (sm, b, ip);
 902
 903   if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
 904     vnet_buffer (b)->sw_if_index[VLIB_TX] = outside_fib_index;
 905
 906   return s;
 907 }
 908
 909 static inline uword
 910 nat44_ed_in2out_fast_path_node_fn_inline (vlib_main_t * vm,
 911                                           vlib_node_runtime_t * node,
 912                                           vlib_frame_t * frame,
 913                                           int is_output_feature)
 914 {
 915   u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
 916   nat_next_t next_index;
 917   snat_main_t *sm = &snat_main;
 918   f64 now = vlib_time_now (vm);
 919   u32 thread_index = vm->thread_index;
 920   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 921   u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
 922     0, def_slow;
 923
 924   def_slow = is_output_feature ? NAT_NEXT_IN2OUT_ED_OUTPUT_SLOW_PATH :
 925     NAT_NEXT_IN2OUT_ED_SLOW_PATH;
 926
 927   stats_node_index = sm->ed_in2out_node_index;
 928
 929   from = vlib_frame_vector_args (frame);
 930   n_left_from = frame->n_vectors;
 931   next_index = node->cached_next_index;
 932
 933   while (n_left_from > 0)
 934     {
 935       u32 n_left_to_next;
 936
 937       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 938
 939       while (n_left_from > 0 && n_left_to_next > 0)
 940         {
 941           u32 bi0;
 942           vlib_buffer_t *b0;
 943           u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
 944             new_addr0, old_addr0;
 945           u16 old_port0, new_port0;
 946           ip4_header_t *ip0;
 947           udp_header_t *udp0;
 948           tcp_header_t *tcp0;
 949           snat_session_t *s0 = 0;
 950           clib_bihash_kv_16_8_t kv0, value0;
 951           ip_csum_t sum0;
 952
 953           /* speculatively enqueue b0 to the current next frame */
 954           bi0 = from[0];
 955           to_next[0] = bi0;
 956           from += 1;
 957           to_next += 1;
 958           n_left_from -= 1;
 959           n_left_to_next -= 1;
 960
 961           b0 = vlib_get_buffer (vm, bi0);
 962
 963           if (is_output_feature)
 964             {
 965               vnet_feature_next (&vnet_buffer2 (b0)->nat.arc_next, b0);
 966               iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
 967             }
 968
 969           next0 = vnet_buffer2 (b0)->nat.arc_next;
 970
 971           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
 972                                   iph_offset0);
 973
 974           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 975           rx_fib_index0 =
 976             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
 977                                                  sw_if_index0);
 978
 979           if (PREDICT_FALSE (ip0->ttl == 1))
 980             {
 981               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 982               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
 983                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
 984                                            0);
 985               next0 = NAT_NEXT_ICMP_ERROR;
 986               goto trace0;
 987             }
 988
 989           udp0 = ip4_next_header (ip0);
 990           tcp0 = (tcp_header_t *) udp0;
 991           proto0 = ip_proto_to_snat_proto (ip0->protocol);
 992
 993           if (PREDICT_FALSE (proto0 == ~0))
 994             {
 995               next0 = def_slow;
 996               goto trace0;
 997             }
 998
 999           if (is_output_feature)
1000             {
1001               if (PREDICT_FALSE (nat_not_translate_output_feature_fwd
1002                                  (sm, ip0, thread_index, now, vm, b0)))
1003                 goto trace0;
1004             }
1005
1006           if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1007             {
1008               next0 = def_slow;
1009               goto trace0;
1010             }
1011
1012           make_ed_kv (&ip0->src_address, &ip0->dst_address,
1013                       ip0->protocol, rx_fib_index0,
1014                       vnet_buffer (b0)->ip.reass.l4_src_port,
1015                       vnet_buffer (b0)->ip.reass.l4_dst_port, ~0ULL, &kv0);
1016
1017           // lookup for session
1018           if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1019             {
1020               // session does not exist go slow path
1021               next0 = def_slow;
1022               goto trace0;
1023             }
1024           s0 = pool_elt_at_index (tsm->sessions, value0.value);
1025
1026           if (s0->tcp_close_timestamp)
1027             {
1028               if (now >= s0->tcp_close_timestamp)
1029                 {
1030                   // session is closed, go slow path
1031                   next0 = def_slow;
1032                 }
1033               else
1034                 {
1035                   // session in transitory timeout, drop
1036                   b0->error = node->errors[NAT_IN2OUT_ED_ERROR_TCP_CLOSED];
1037                   next0 = NAT_NEXT_DROP;
1038                 }
1039               goto trace0;
1040             }
1041
1042           // drop if session expired
1043           u64 sess_timeout_time;
1044           sess_timeout_time = s0->last_heard +
1045             (f64) nat44_session_get_timeout (sm, s0);
1046           if (now >= sess_timeout_time)
1047             {
1048               nat_free_session_data (sm, s0, thread_index, 0);
1049               nat44_ed_delete_session (sm, s0, thread_index, 1);
1050               // session is closed, go slow path
1051               next0 = def_slow;
1052               goto trace0;
1053             }
1054
1055           b0->flags |= VNET_BUFFER_F_IS_NATED;
1056
1057           if (!is_output_feature)
1058             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1059
1060           old_addr0 = ip0->src_address.as_u32;
1061           new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1062           sum0 = ip0->checksum;
1063           sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1064                                  src_address);
1065           if (PREDICT_FALSE (is_twice_nat_session (s0)))
1066             sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1067                                    s0->ext_host_addr.as_u32, ip4_header_t,
1068                                    dst_address);
1069           ip0->checksum = ip_csum_fold (sum0);
1070
1071           old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1072
1073           if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1074             {
1075               if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1076                 {
1077                   new_port0 = udp0->src_port = s0->out2in.port;
1078                   sum0 = tcp0->checksum;
1079                   sum0 =
1080                     ip_csum_update (sum0, old_addr0, new_addr0,
1081                                     ip4_header_t, dst_address);
1082                   sum0 =
1083                     ip_csum_update (sum0, old_port0, new_port0,
1084                                     ip4_header_t, length);
1085                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1086                     {
1087                       sum0 =
1088                         ip_csum_update (sum0, ip0->dst_address.as_u32,
1089                                         s0->ext_host_addr.as_u32,
1090                                         ip4_header_t, dst_address);
1091                       sum0 =
1092                         ip_csum_update (sum0,
1093                                         vnet_buffer (b0)->ip.
1094                                         reass.l4_dst_port, s0->ext_host_port,
1095                                         ip4_header_t, length);
1096                       tcp0->dst_port = s0->ext_host_port;
1097                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1098                     }
1099                   mss_clamping (sm, tcp0, &sum0);
1100                   tcp0->checksum = ip_csum_fold (sum0);
1101                 }
1102               tcp_packets++;
1103               if (nat44_set_tcp_session_state_i2o
1104                   (sm, now, s0, b0, thread_index))
1105                 goto trace0;
1106             }
1107           else if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment
1108                    && udp0->checksum)
1109             {
1110               new_port0 = udp0->src_port = s0->out2in.port;
1111               sum0 = udp0->checksum;
1112               sum0 =
1113                 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1114                                 dst_address);
1115               sum0 =
1116                 ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1117                                 length);
1118               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1119                 {
1120                   sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1121                                          s0->ext_host_addr.as_u32,
1122                                          ip4_header_t, dst_address);
1123                   sum0 =
1124                     ip_csum_update (sum0,
1125                                     vnet_buffer (b0)->ip.reass.l4_dst_port,
1126                                     s0->ext_host_port, ip4_header_t, length);
1127                   udp0->dst_port = s0->ext_host_port;
1128                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1129                 }
1130               udp0->checksum = ip_csum_fold (sum0);
1131               udp_packets++;
1132             }
1133           else
1134             {
1135               if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1136                 {
1137                   new_port0 = udp0->src_port = s0->out2in.port;
1138                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1139                     {
1140                       udp0->dst_port = s0->ext_host_port;
1141                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1142                     }
1143                   udp_packets++;
1144                 }
1145             }
1146
1147           /* Accounting */
1148           nat44_session_update_counters (s0, now,
1149                                          vlib_buffer_length_in_chain
1150                                          (vm, b0), thread_index);
1151           /* Per-user LRU list maintenance */
1152           nat44_session_update_lru (sm, s0, thread_index);
1153
1154         trace0:
1155           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1156                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1157             {
1158               nat_in2out_ed_trace_t *t =
1159                 vlib_add_trace (vm, node, b0, sizeof (*t));
1160               t->sw_if_index = sw_if_index0;
1161               t->next_index = next0;
1162               t->is_slow_path = 0;
1163
1164               if (s0)
1165                 t->session_index = s0 - tsm->sessions;
1166               else
1167                 t->session_index = ~0;
1168             }
1169
1170           pkts_processed += next0 == vnet_buffer2 (b0)->nat.arc_next;
1171           /* verify speculative enqueue, maybe switch current next frame */
1172           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1173                                            to_next, n_left_to_next,
1174                                            bi0, next0);
1175         }
1176
1177       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1178     }
1179
1180   vlib_node_increment_counter (vm, stats_node_index,
1181                                NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
1182                                pkts_processed);
1183   vlib_node_increment_counter (vm, stats_node_index,
1184                                NAT_IN2OUT_ED_ERROR_TCP_PACKETS, tcp_packets);
1185   vlib_node_increment_counter (vm, stats_node_index,
1186                                NAT_IN2OUT_ED_ERROR_UDP_PACKETS, udp_packets);
1187   vlib_node_increment_counter (vm, stats_node_index,
1188                                NAT_IN2OUT_ED_ERROR_ICMP_PACKETS,
1189                                icmp_packets);
1190   vlib_node_increment_counter (vm, stats_node_index,
1191                                NAT_IN2OUT_ED_ERROR_OTHER_PACKETS,
1192                                other_packets);
1193   return frame->n_vectors;
1194 }
1195
1196 static inline uword
1197 nat44_ed_in2out_slow_path_node_fn_inline (vlib_main_t * vm,
1198                                           vlib_node_runtime_t * node,
1199                                           vlib_frame_t * frame,
1200                                           int is_output_feature)
1201 {
1202   u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
1203   nat_next_t next_index;
1204   snat_main_t *sm = &snat_main;
1205   f64 now = vlib_time_now (vm);
1206   u32 thread_index = vm->thread_index;
1207   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
1208   u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets = 0;
1209
1210   stats_node_index = sm->ed_in2out_slowpath_node_index;
1211
1212   from = vlib_frame_vector_args (frame);
1213   n_left_from = frame->n_vectors;
1214   next_index = node->cached_next_index;
1215
1216   while (n_left_from > 0)
1217     {
1218       u32 n_left_to_next;
1219
1220       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1221
1222       while (n_left_from > 0 && n_left_to_next > 0)
1223         {
1224           u32 bi0;
1225           vlib_buffer_t *b0;
1226           u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
1227             new_addr0, old_addr0;
1228           u16 old_port0, new_port0;
1229           ip4_header_t *ip0;
1230           udp_header_t *udp0;
1231           tcp_header_t *tcp0;
1232           icmp46_header_t *icmp0;
1233           snat_session_t *s0 = 0;
1234           clib_bihash_kv_16_8_t kv0, value0;
1235           ip_csum_t sum0;
1236
1237           /* speculatively enqueue b0 to the current next frame */
1238           bi0 = from[0];
1239           to_next[0] = bi0;
1240           from += 1;
1241           to_next += 1;
1242           n_left_from -= 1;
1243           n_left_to_next -= 1;
1244
1245           b0 = vlib_get_buffer (vm, bi0);
1246
1247           if (is_output_feature)
1248             iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
1249
1250           next0 = vnet_buffer2 (b0)->nat.arc_next;
1251
1252           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1253                                   iph_offset0);
1254
1255           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1256           rx_fib_index0 =
1257             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1258                                                  sw_if_index0);
1259
1260           if (PREDICT_FALSE (ip0->ttl == 1))
1261             {
1262               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1263               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1264                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
1265                                            0);
1266               next0 = NAT_NEXT_ICMP_ERROR;
1267               goto trace0;
1268             }
1269
1270           udp0 = ip4_next_header (ip0);
1271           tcp0 = (tcp_header_t *) udp0;
1272           icmp0 = (icmp46_header_t *) udp0;
1273           proto0 = ip_proto_to_snat_proto (ip0->protocol);
1274
1275           if (PREDICT_FALSE (proto0 == ~0))
1276             {
1277               s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
1278                                                   rx_fib_index0,
1279                                                   thread_index, now,
1280                                                   vm, node);
1281               if (!s0)
1282                 next0 = NAT_NEXT_DROP;
1283
1284               other_packets++;
1285               goto trace0;
1286             }
1287
1288           if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1289             {
1290               next0 = icmp_in2out_ed_slow_path
1291                 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0,
1292                  node, next0, now, thread_index, &s0);
1293               icmp_packets++;
1294               goto trace0;
1295             }
1296
1297           // move down
1298           make_ed_kv (&ip0->src_address, &ip0->dst_address,
1299                       ip0->protocol, rx_fib_index0,
1300                       vnet_buffer (b0)->ip.reass.l4_src_port,
1301                       vnet_buffer (b0)->ip.reass.l4_dst_port, ~0ULL, &kv0);
1302
1303           if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1304             {
1305               s0 = pool_elt_at_index (tsm->sessions, value0.value);
1306
1307               if (s0->tcp_close_timestamp && now >= s0->tcp_close_timestamp)
1308                 {
1309                   nat_free_session_data (sm, s0, thread_index, 0);
1310                   nat44_ed_delete_session (sm, s0, thread_index, 1);
1311                   s0 = NULL;
1312                 }
1313             }
1314
1315           if (!s0)
1316             {
1317               if (is_output_feature)
1318                 {
1319                   if (PREDICT_FALSE
1320                       (nat44_ed_not_translate_output_feature
1321                        (sm, ip0, vnet_buffer (b0)->ip.reass.l4_src_port,
1322                         vnet_buffer (b0)->ip.reass.l4_dst_port, thread_index,
1323                         sw_if_index0,
1324                         vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1325                     goto trace0;
1326
1327                   /*
1328                    * Send DHCP packets to the ipv4 stack, or we won't
1329                    * be able to use dhcp client on the outside interface
1330                    */
1331                   if (PREDICT_FALSE
1332                       (proto0 == SNAT_PROTOCOL_UDP
1333                        && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
1334                            clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_server))
1335                        && ip0->dst_address.as_u32 == 0xffffffff))
1336                     goto trace0;
1337                 }
1338               else
1339                 {
1340                   if (PREDICT_FALSE
1341                       (nat44_ed_not_translate
1342                        (sm, node, sw_if_index0, ip0, proto0, rx_fib_index0,
1343                         thread_index)))
1344                     goto trace0;
1345                 }
1346
1347               next0 =
1348                 slow_path_ed (sm, b0, ip0->src_address, ip0->dst_address,
1349                               vnet_buffer (b0)->ip.reass.l4_src_port,
1350                               vnet_buffer (b0)->ip.reass.l4_dst_port,
1351                               ip0->protocol, rx_fib_index0, &s0, node, next0,
1352                               thread_index, now);
1353
1354               if (PREDICT_FALSE (next0 == NAT_NEXT_DROP))
1355                 goto trace0;
1356
1357               if (PREDICT_FALSE (!s0))
1358                 goto trace0;
1359
1360             }
1361
1362           b0->flags |= VNET_BUFFER_F_IS_NATED;
1363
1364           if (!is_output_feature)
1365             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1366
1367           old_addr0 = ip0->src_address.as_u32;
1368           new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1369           sum0 = ip0->checksum;
1370           sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1371                                  src_address);
1372           if (PREDICT_FALSE (is_twice_nat_session (s0)))
1373             sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1374                                    s0->ext_host_addr.as_u32, ip4_header_t,
1375                                    dst_address);
1376           ip0->checksum = ip_csum_fold (sum0);
1377
1378           old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1379
1380           if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1381             {
1382               if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1383                 {
1384                   new_port0 = udp0->src_port = s0->out2in.port;
1385                   sum0 = tcp0->checksum;
1386                   sum0 =
1387                     ip_csum_update (sum0, old_addr0, new_addr0,
1388                                     ip4_header_t, dst_address);
1389                   sum0 =
1390                     ip_csum_update (sum0, old_port0, new_port0,
1391                                     ip4_header_t, length);
1392                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1393                     {
1394                       sum0 =
1395                         ip_csum_update (sum0, ip0->dst_address.as_u32,
1396                                         s0->ext_host_addr.as_u32,
1397                                         ip4_header_t, dst_address);
1398                       sum0 =
1399                         ip_csum_update (sum0,
1400                                         vnet_buffer (b0)->ip.
1401                                         reass.l4_dst_port, s0->ext_host_port,
1402                                         ip4_header_t, length);
1403                       tcp0->dst_port = s0->ext_host_port;
1404                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1405                     }
1406                   mss_clamping (sm, tcp0, &sum0);
1407                   tcp0->checksum = ip_csum_fold (sum0);
1408                 }
1409               tcp_packets++;
1410               if (nat44_set_tcp_session_state_i2o
1411                   (sm, now, s0, b0, thread_index))
1412                 goto trace0;
1413             }
1414           else if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment
1415                    && udp0->checksum)
1416             {
1417               new_port0 = udp0->src_port = s0->out2in.port;
1418               sum0 = udp0->checksum;
1419               sum0 =
1420                 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1421                                 dst_address);
1422               sum0 =
1423                 ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1424                                 length);
1425               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1426                 {
1427                   sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1428                                          s0->ext_host_addr.as_u32,
1429                                          ip4_header_t, dst_address);
1430                   sum0 =
1431                     ip_csum_update (sum0,
1432                                     vnet_buffer (b0)->ip.reass.l4_dst_port,
1433                                     s0->ext_host_port, ip4_header_t, length);
1434                   udp0->dst_port = s0->ext_host_port;
1435                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1436                 }
1437               udp0->checksum = ip_csum_fold (sum0);
1438               udp_packets++;
1439             }
1440           else
1441             {
1442               if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1443                 {
1444                   new_port0 = udp0->src_port = s0->out2in.port;
1445                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1446                     {
1447                       udp0->dst_port = s0->ext_host_port;
1448                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1449                     }
1450                   udp_packets++;
1451                 }
1452             }
1453
1454           /* Accounting */
1455           nat44_session_update_counters (s0, now,
1456                                          vlib_buffer_length_in_chain
1457                                          (vm, b0), thread_index);
1458           /* Per-user LRU list maintenance */
1459           nat44_session_update_lru (sm, s0, thread_index);
1460
1461         trace0:
1462           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1463                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1464             {
1465               nat_in2out_ed_trace_t *t =
1466                 vlib_add_trace (vm, node, b0, sizeof (*t));
1467               t->sw_if_index = sw_if_index0;
1468               t->next_index = next0;
1469               t->is_slow_path = 1;
1470
1471               if (s0)
1472                 t->session_index = s0 - tsm->sessions;
1473               else
1474                 t->session_index = ~0;
1475             }
1476
1477           pkts_processed += next0 == vnet_buffer2 (b0)->nat.arc_next;
1478
1479           /* verify speculative enqueue, maybe switch current next frame */
1480           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1481                                            to_next, n_left_to_next,
1482                                            bi0, next0);
1483         }
1484
1485       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1486     }
1487
1488   vlib_node_increment_counter (vm, stats_node_index,
1489                                NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
1490                                pkts_processed);
1491   vlib_node_increment_counter (vm, stats_node_index,
1492                                NAT_IN2OUT_ED_ERROR_TCP_PACKETS, tcp_packets);
1493   vlib_node_increment_counter (vm, stats_node_index,
1494                                NAT_IN2OUT_ED_ERROR_UDP_PACKETS, udp_packets);
1495   vlib_node_increment_counter (vm, stats_node_index,
1496                                NAT_IN2OUT_ED_ERROR_ICMP_PACKETS,
1497                                icmp_packets);
1498   vlib_node_increment_counter (vm, stats_node_index,
1499                                NAT_IN2OUT_ED_ERROR_OTHER_PACKETS,
1500                                other_packets);
1501   return frame->n_vectors;
1502 }
1503
1504 VLIB_NODE_FN (nat44_ed_in2out_node) (vlib_main_t * vm,
1505                                      vlib_node_runtime_t * node,
1506                                      vlib_frame_t * frame)
1507 {
1508   return nat44_ed_in2out_fast_path_node_fn_inline (vm, node, frame, 0);
1509 }
1510
1511 /* *INDENT-OFF* */
1512 VLIB_REGISTER_NODE (nat44_ed_in2out_node) = {
1513   .name = "nat44-ed-in2out",
1514   .vector_size = sizeof (u32),
1515   .sibling_of = "nat-default",
1516   .format_trace = format_nat_in2out_ed_trace,
1517   .type = VLIB_NODE_TYPE_INTERNAL,
1518   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1519   .error_strings = nat_in2out_ed_error_strings,
1520   .runtime_data_bytes = sizeof (snat_runtime_t),
1521 };
1522 /* *INDENT-ON* */
1523
1524 VLIB_NODE_FN (nat44_ed_in2out_output_node) (vlib_main_t * vm,
1525                                             vlib_node_runtime_t * node,
1526                                             vlib_frame_t * frame)
1527 {
1528   return nat44_ed_in2out_fast_path_node_fn_inline (vm, node, frame, 1);
1529 }
1530
1531 /* *INDENT-OFF* */
1532 VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = {
1533   .name = "nat44-ed-in2out-output",
1534   .vector_size = sizeof (u32),
1535   .sibling_of = "nat-default",
1536   .format_trace = format_nat_in2out_ed_trace,
1537   .type = VLIB_NODE_TYPE_INTERNAL,
1538   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1539   .error_strings = nat_in2out_ed_error_strings,
1540   .runtime_data_bytes = sizeof (snat_runtime_t),
1541 };
1542 /* *INDENT-ON* */
1543
1544 VLIB_NODE_FN (nat44_ed_in2out_slowpath_node) (vlib_main_t * vm,
1545                                               vlib_node_runtime_t *
1546                                               node, vlib_frame_t * frame)
1547 {
1548   return nat44_ed_in2out_slow_path_node_fn_inline (vm, node, frame, 0);
1549 }
1550
1551 /* *INDENT-OFF* */
1552 VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = {
1553   .name = "nat44-ed-in2out-slowpath",
1554   .vector_size = sizeof (u32),
1555   .sibling_of = "nat-default",
1556   .format_trace = format_nat_in2out_ed_trace,
1557   .type = VLIB_NODE_TYPE_INTERNAL,
1558   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1559   .error_strings = nat_in2out_ed_error_strings,
1560   .runtime_data_bytes = sizeof (snat_runtime_t),
1561 };
1562 /* *INDENT-ON* */
1563
1564 VLIB_NODE_FN (nat44_ed_in2out_output_slowpath_node) (vlib_main_t * vm,
1565                                                      vlib_node_runtime_t
1566                                                      * node,
1567                                                      vlib_frame_t * frame)
1568 {
1569   return nat44_ed_in2out_slow_path_node_fn_inline (vm, node, frame, 1);
1570 }
1571
1572 /* *INDENT-OFF* */
1573 VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = {
1574   .name = "nat44-ed-in2out-output-slowpath",
1575   .vector_size = sizeof (u32),
1576   .sibling_of = "nat-default",
1577   .format_trace = format_nat_in2out_ed_trace,
1578   .type = VLIB_NODE_TYPE_INTERNAL,
1579   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1580   .error_strings = nat_in2out_ed_error_strings,
1581   .runtime_data_bytes = sizeof (snat_runtime_t),
1582 };
1583 /* *INDENT-ON* */
1584
1585 static u8 *
1586 format_nat_pre_trace (u8 * s, va_list * args)
1587 {
1588   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1589   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1590   nat_pre_trace_t *t = va_arg (*args, nat_pre_trace_t *);
1591   return format (s, "in2out next_index %d", t->next_index);
1592 }
1593
1594 VLIB_NODE_FN (nat_pre_in2out_node)
1595   (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1596 {
1597   return nat_pre_node_fn_inline (vm, node, frame,
1598                                  NAT_NEXT_IN2OUT_ED_FAST_PATH);
1599 }
1600
1601 /* *INDENT-OFF* */
1602 VLIB_REGISTER_NODE (nat_pre_in2out_node) = {
1603   .name = "nat-pre-in2out",
1604   .vector_size = sizeof (u32),
1605   .sibling_of = "nat-default",
1606   .format_trace = format_nat_pre_trace,
1607   .type = VLIB_NODE_TYPE_INTERNAL,
1608   .n_errors = 0,
1609 };
1610 /* *INDENT-ON* */
1611
1612 /*
1613  * fd.io coding-style-patch-verification: ON
1614  *
1615  * Local Variables:
1616  * eval: (c-set-style "gnu")
1617  * End:
1618  */