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 <vppinfra/error.h>
  27 #include <nat/nat.h>
  28 #include <nat/nat_ipfix_logging.h>
  29 #include <nat/nat_reass.h>
  30 #include <nat/nat_inlines.h>
  31 #include <nat/nat_syslog.h>
  32
  33 #define foreach_nat_in2out_ed_error                     \
  34 _(UNSUPPORTED_PROTOCOL, "unsupported protocol")         \
  35 _(IN2OUT_PACKETS, "good in2out packets processed")      \
  36 _(OUT_OF_PORTS, "out of ports")                         \
  37 _(BAD_ICMP_TYPE, "unsupported ICMP type")               \
  38 _(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded")   \
  39 _(DROP_FRAGMENT, "drop fragment")                       \
  40 _(MAX_REASS, "maximum reassemblies exceeded")           \
  41 _(MAX_FRAG, "maximum fragments per reassembly exceeded")\
  42 _(NON_SYN, "non-SYN packet try to create session")      \
  43 _(TCP_PACKETS, "TCP packets")                           \
  44 _(UDP_PACKETS, "UDP packets")                           \
  45 _(ICMP_PACKETS, "ICMP packets")                         \
  46 _(OTHER_PACKETS, "other protocol packets")              \
  47 _(FRAGMENTS, "fragments")                               \
  48 _(CACHED_FRAGMENTS, "cached fragments")                 \
  49 _(PROCESSED_FRAGMENTS, "processed fragments")
  50
  51
  52 typedef enum
  53 {
  54 #define _(sym,str) NAT_IN2OUT_ED_ERROR_##sym,
  55   foreach_nat_in2out_ed_error
  56 #undef _
  57     NAT_IN2OUT_ED_N_ERROR,
  58 } nat_in2out_ed_error_t;
  59
  60 static char *nat_in2out_ed_error_strings[] = {
  61 #define _(sym,string) string,
  62   foreach_nat_in2out_ed_error
  63 #undef _
  64 };
  65
  66 typedef enum
  67 {
  68   NAT_IN2OUT_ED_NEXT_LOOKUP,
  69   NAT_IN2OUT_ED_NEXT_DROP,
  70   NAT_IN2OUT_ED_NEXT_ICMP_ERROR,
  71   NAT_IN2OUT_ED_NEXT_SLOW_PATH,
  72   NAT_IN2OUT_ED_NEXT_REASS,
  73   NAT_IN2OUT_ED_N_NEXT,
  74 } nat_in2out_ed_next_t;
  75
  76 typedef struct
  77 {
  78   u32 sw_if_index;
  79   u32 next_index;
  80   u32 session_index;
  81   u32 is_slow_path;
  82 } nat_in2out_ed_trace_t;
  83
  84 vlib_node_registration_t nat44_ed_in2out_node;
  85 vlib_node_registration_t nat44_ed_in2out_slowpath_node;
  86 vlib_node_registration_t nat44_ed_in2out_output_node;
  87 vlib_node_registration_t nat44_ed_in2out_output_slowpath_node;
  88 vlib_node_registration_t nat44_ed_in2out_reass_node;
  89
  90 static u8 *
  91 format_nat_in2out_ed_trace (u8 * s, va_list * args)
  92 {
  93   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  94   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  95   nat_in2out_ed_trace_t *t = va_arg (*args, nat_in2out_ed_trace_t *);
  96   char *tag;
  97
  98   tag =
  99     t->is_slow_path ? "NAT44_IN2OUT_ED_SLOW_PATH" :
 100     "NAT44_IN2OUT_ED_FAST_PATH";
 101
 102   s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
 103               t->sw_if_index, t->next_index, t->session_index);
 104
 105   return s;
 106 }
 107
 108 static_always_inline int
 109 icmp_get_ed_key (ip4_header_t * ip0, nat_ed_ses_key_t * p_key0)
 110 {
 111   icmp46_header_t *icmp0;
 112   nat_ed_ses_key_t key0;
 113   icmp_echo_header_t *echo0, *inner_echo0 = 0;
 114   ip4_header_t *inner_ip0 = 0;
 115   void *l4_header = 0;
 116   icmp46_header_t *inner_icmp0;
 117
 118   icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
 119   echo0 = (icmp_echo_header_t *) (icmp0 + 1);
 120
 121   if (!icmp_is_error_message (icmp0))
 122     {
 123       key0.proto = IP_PROTOCOL_ICMP;
 124       key0.l_addr = ip0->src_address;
 125       key0.r_addr = ip0->dst_address;
 126       key0.l_port = echo0->identifier;
 127       key0.r_port = 0;
 128     }
 129   else
 130     {
 131       inner_ip0 = (ip4_header_t *) (echo0 + 1);
 132       l4_header = ip4_next_header (inner_ip0);
 133       key0.proto = inner_ip0->protocol;
 134       key0.r_addr = inner_ip0->src_address;
 135       key0.l_addr = inner_ip0->dst_address;
 136       switch (ip_proto_to_snat_proto (inner_ip0->protocol))
 137         {
 138         case SNAT_PROTOCOL_ICMP:
 139           inner_icmp0 = (icmp46_header_t *) l4_header;
 140           inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
 141           key0.r_port = 0;
 142           key0.l_port = inner_echo0->identifier;
 143           break;
 144         case SNAT_PROTOCOL_UDP:
 145         case SNAT_PROTOCOL_TCP:
 146           key0.l_port = ((tcp_udp_header_t *) l4_header)->dst_port;
 147           key0.r_port = ((tcp_udp_header_t *) l4_header)->src_port;
 148           break;
 149         default:
 150           return NAT_IN2OUT_ED_ERROR_UNSUPPORTED_PROTOCOL;
 151         }
 152     }
 153   *p_key0 = key0;
 154   return 0;
 155 }
 156
 157 int
 158 nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
 159 {
 160   snat_main_t *sm = &snat_main;
 161   nat44_is_idle_session_ctx_t *ctx = arg;
 162   snat_session_t *s;
 163   u64 sess_timeout_time;
 164   nat_ed_ses_key_t ed_key;
 165   clib_bihash_kv_16_8_t ed_kv;
 166   int i;
 167   snat_address_t *a;
 168   snat_session_key_t key;
 169   snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
 170                                                        ctx->thread_index);
 171
 172   s = pool_elt_at_index (tsm->sessions, kv->value);
 173   sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
 174   if (ctx->now >= sess_timeout_time)
 175     {
 176       if (is_fwd_bypass_session (s))
 177         goto delete;
 178
 179       ed_key.l_addr = s->out2in.addr;
 180       ed_key.r_addr = s->ext_host_addr;
 181       ed_key.fib_index = s->out2in.fib_index;
 182       if (snat_is_unk_proto_session (s))
 183         {
 184           ed_key.proto = s->in2out.port;
 185           ed_key.r_port = 0;
 186           ed_key.l_port = 0;
 187         }
 188       else
 189         {
 190           ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol);
 191           ed_key.l_port = s->out2in.port;
 192           ed_key.r_port = s->ext_host_port;
 193         }
 194       ed_kv.key[0] = ed_key.as_u64[0];
 195       ed_kv.key[1] = ed_key.as_u64[1];
 196       if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &ed_kv, 0))
 197         nat_log_warn ("out2in_ed key del failed");
 198
 199       if (snat_is_unk_proto_session (s))
 200         goto delete;
 201
 202       snat_ipfix_logging_nat44_ses_delete (s->in2out.addr.as_u32,
 203                                            s->out2in.addr.as_u32,
 204                                            s->in2out.protocol,
 205                                            s->in2out.port,
 206                                            s->out2in.port,
 207                                            s->in2out.fib_index);
 208
 209       nat_syslog_nat44_sdel (s->user_index, s->in2out.fib_index,
 210                              &s->in2out.addr, s->in2out.port,
 211                              &s->ext_host_nat_addr, s->ext_host_nat_port,
 212                              &s->out2in.addr, s->out2in.port,
 213                              &s->ext_host_addr, s->ext_host_port,
 214                              s->in2out.protocol, is_twice_nat_session (s));
 215
 216       if (is_twice_nat_session (s))
 217         {
 218           for (i = 0; i < vec_len (sm->twice_nat_addresses); i++)
 219             {
 220               key.protocol = s->in2out.protocol;
 221               key.port = s->ext_host_nat_port;
 222               a = sm->twice_nat_addresses + i;
 223               if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
 224                 {
 225                   snat_free_outside_address_and_port (sm->twice_nat_addresses,
 226                                                       ctx->thread_index,
 227                                                       &key);
 228                   break;
 229                 }
 230             }
 231         }
 232
 233       if (snat_is_session_static (s))
 234         goto delete;
 235
 236       snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
 237                                           &s->out2in);
 238     delete:
 239       nat44_delete_session (sm, s, ctx->thread_index);
 240       return 1;
 241     }
 242
 243   return 0;
 244 }
 245
 246 static inline u32
 247 icmp_in2out_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
 248                           ip4_header_t * ip0, icmp46_header_t * icmp0,
 249                           u32 sw_if_index0, u32 rx_fib_index0,
 250                           vlib_node_runtime_t * node, u32 next0, f64 now,
 251                           u32 thread_index, snat_session_t ** p_s0)
 252 {
 253   next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
 254                        next0, thread_index, p_s0, 0);
 255   snat_session_t *s0 = *p_s0;
 256   if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP && s0))
 257     {
 258       /* Accounting */
 259       nat44_session_update_counters (s0, now,
 260                                      vlib_buffer_length_in_chain
 261                                      (sm->vlib_main, b0));
 262       /* Per-user LRU list maintenance */
 263       nat44_session_update_lru (sm, s0, thread_index);
 264     }
 265   return next0;
 266 }
 267
 268 static u32
 269 slow_path_ed (snat_main_t * sm,
 270               vlib_buffer_t * b,
 271               u32 rx_fib_index,
 272               clib_bihash_kv_16_8_t * kv,
 273               snat_session_t ** sessionp,
 274               vlib_node_runtime_t * node, u32 next, u32 thread_index, f64 now,
 275               tcp_header_t * tcp)
 276 {
 277   snat_session_t *s = 0;
 278   snat_user_t *u;
 279   snat_session_key_t key0, key1;
 280   lb_nat_type_t lb = 0, is_sm = 0;
 281   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 282   nat_ed_ses_key_t *key = (nat_ed_ses_key_t *) kv->key;
 283   u32 proto = ip_proto_to_snat_proto (key->proto);
 284   nat_outside_fib_t *outside_fib;
 285   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
 286   u8 identity_nat;
 287   fib_prefix_t pfx = {
 288     .fp_proto = FIB_PROTOCOL_IP4,
 289     .fp_len = 32,
 290     .fp_addr = {
 291                 .ip4.as_u32 = key->r_addr.as_u32,
 292                 },
 293   };
 294   nat44_is_idle_session_ctx_t ctx;
 295
 296   if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
 297     {
 298       b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
 299       nat_ipfix_logging_max_sessions (sm->max_translations);
 300       nat_log_notice ("maximum sessions exceeded");
 301       return NAT_IN2OUT_ED_NEXT_DROP;
 302     }
 303
 304   key0.addr = key->l_addr;
 305   key0.port = key->l_port;
 306   key1.protocol = key0.protocol = proto;
 307   key0.fib_index = rx_fib_index;
 308   key1.fib_index = sm->outside_fib_index;
 309   /* First try to match static mapping by local address and port */
 310   if (snat_static_mapping_match
 311       (sm, key0, &key1, 0, 0, 0, &lb, 0, &identity_nat))
 312     {
 313       /* Try to create dynamic translation */
 314       if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index,
 315                                                thread_index, &key1,
 316                                                sm->port_per_thread,
 317                                                tsm->snat_thread_index))
 318         {
 319           nat_log_notice ("addresses exhausted");
 320           b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS];
 321           return NAT_IN2OUT_ED_NEXT_DROP;
 322         }
 323     }
 324   else
 325     {
 326       if (PREDICT_FALSE (identity_nat))
 327         {
 328           *sessionp = s;
 329           return next;
 330         }
 331
 332       is_sm = 1;
 333     }
 334
 335   if (proto == SNAT_PROTOCOL_TCP)
 336     {
 337       if (!tcp_is_init (tcp))
 338         {
 339           b->error = node->errors[NAT_IN2OUT_ED_ERROR_NON_SYN];
 340           return NAT_IN2OUT_ED_NEXT_DROP;
 341         }
 342     }
 343
 344   u = nat_user_get_or_create (sm, &key->l_addr, rx_fib_index, thread_index);
 345   if (!u)
 346     {
 347       nat_log_warn ("create NAT user failed");
 348       if (!is_sm)
 349         snat_free_outside_address_and_port (sm->addresses,
 350                                             thread_index, &key1);
 351       return NAT_IN2OUT_ED_NEXT_DROP;
 352     }
 353
 354   s = nat_ed_session_alloc (sm, u, thread_index, now);
 355   if (!s)
 356     {
 357       nat44_delete_user_with_no_session (sm, u, thread_index);
 358       nat_log_warn ("create NAT session failed");
 359       if (!is_sm)
 360         snat_free_outside_address_and_port (sm->addresses,
 361                                             thread_index, &key1);
 362       return NAT_IN2OUT_ED_NEXT_DROP;
 363     }
 364
 365   user_session_increment (sm, u, is_sm);
 366   if (is_sm)
 367     s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
 368   if (lb)
 369     s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
 370   s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
 371   s->ext_host_addr = key->r_addr;
 372   s->ext_host_port = key->r_port;
 373   s->in2out = key0;
 374   s->out2in = key1;
 375   s->out2in.protocol = key0.protocol;
 376
 377   switch (vec_len (sm->outside_fibs))
 378     {
 379     case 0:
 380       s->out2in.fib_index = sm->outside_fib_index;
 381       break;
 382     case 1:
 383       s->out2in.fib_index = sm->outside_fibs[0].fib_index;
 384       break;
 385     default:
 386       /* *INDENT-OFF* */
 387       vec_foreach (outside_fib, sm->outside_fibs)
 388        {
 389           fei = fib_table_lookup (outside_fib->fib_index, &pfx);
 390           if (FIB_NODE_INDEX_INVALID != fei)
 391             {
 392               if (fib_entry_get_resolving_interface (fei) != ~0)
 393                 {
 394                   s->out2in.fib_index = outside_fib->fib_index;
 395                   break;
 396                 }
 397             }
 398         }
 399       /* *INDENT-ON* */
 400       break;
 401     }
 402
 403   /* Add to lookup tables */
 404   kv->value = s - tsm->sessions;
 405   ctx.now = now;
 406   ctx.thread_index = thread_index;
 407   if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, kv,
 408                                                nat44_i2o_ed_is_idle_session_cb,
 409                                                &ctx))
 410     nat_log_notice ("in2out-ed key add failed");
 411
 412   make_ed_kv (kv, &key1.addr, &key->r_addr, key->proto, s->out2in.fib_index,
 413               key1.port, key->r_port);
 414   kv->value = s - tsm->sessions;
 415   if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, kv,
 416                                                nat44_o2i_ed_is_idle_session_cb,
 417                                                &ctx))
 418     nat_log_notice ("out2in-ed key add failed");
 419
 420   *sessionp = s;
 421
 422   /* log NAT event */
 423   snat_ipfix_logging_nat44_ses_create (s->in2out.addr.as_u32,
 424                                        s->out2in.addr.as_u32,
 425                                        s->in2out.protocol,
 426                                        s->in2out.port,
 427                                        s->out2in.port, s->in2out.fib_index);
 428
 429   nat_syslog_nat44_sadd (s->user_index, s->in2out.fib_index,
 430                          &s->in2out.addr, s->in2out.port,
 431                          &s->ext_host_nat_addr, s->ext_host_nat_port,
 432                          &s->out2in.addr, s->out2in.port,
 433                          &s->ext_host_addr, s->ext_host_port,
 434                          s->in2out.protocol, 0);
 435
 436   return next;
 437 }
 438
 439 static_always_inline int
 440 nat44_ed_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
 441                         u32 sw_if_index, ip4_header_t * ip, u32 proto,
 442                         u32 rx_fib_index, u32 thread_index)
 443 {
 444   udp_header_t *udp = ip4_next_header (ip);
 445   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 446   clib_bihash_kv_16_8_t kv, value;
 447   snat_session_key_t key0, key1;
 448
 449   make_ed_kv (&kv, &ip->dst_address, &ip->src_address, ip->protocol,
 450               sm->outside_fib_index, udp->dst_port, udp->src_port);
 451
 452   /* NAT packet aimed at external address if */
 453   /* has active sessions */
 454   if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
 455     {
 456       key0.addr = ip->dst_address;
 457       key0.port = udp->dst_port;
 458       key0.protocol = proto;
 459       key0.fib_index = sm->outside_fib_index;
 460       /* or is static mappings */
 461       if (!snat_static_mapping_match (sm, key0, &key1, 1, 0, 0, 0, 0, 0))
 462         return 0;
 463     }
 464   else
 465     return 0;
 466
 467   if (sm->forwarding_enabled)
 468     return 1;
 469
 470   return snat_not_translate_fast (sm, node, sw_if_index, ip, proto,
 471                                   rx_fib_index);
 472 }
 473
 474 static_always_inline int
 475 nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip,
 476                                       u32 thread_index, f64 now,
 477                                       vlib_main_t * vm, vlib_buffer_t * b)
 478 {
 479   nat_ed_ses_key_t key;
 480   clib_bihash_kv_16_8_t kv, value;
 481   udp_header_t *udp;
 482   snat_session_t *s = 0;
 483   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 484
 485   if (!sm->forwarding_enabled)
 486     return 0;
 487
 488   if (ip->protocol == IP_PROTOCOL_ICMP)
 489     {
 490       key.as_u64[0] = key.as_u64[1] = 0;
 491       if (icmp_get_ed_key (ip, &key))
 492         return 0;
 493       key.fib_index = 0;
 494       kv.key[0] = key.as_u64[0];
 495       kv.key[1] = key.as_u64[1];
 496     }
 497   else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
 498     {
 499       udp = ip4_next_header (ip);
 500       make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0,
 501                   udp->src_port, udp->dst_port);
 502     }
 503   else
 504     {
 505       make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0, 0,
 506                   0);
 507     }
 508
 509   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 510     {
 511       s = pool_elt_at_index (tsm->sessions, value.value);
 512       if (is_fwd_bypass_session (s))
 513         {
 514           if (ip->protocol == IP_PROTOCOL_TCP)
 515             {
 516               tcp_header_t *tcp = ip4_next_header (ip);
 517               if (nat44_set_tcp_session_state_i2o (sm, s, tcp, thread_index))
 518                 return 1;
 519             }
 520           /* Accounting */
 521           nat44_session_update_counters (s, now,
 522                                          vlib_buffer_length_in_chain (vm, b));
 523           /* Per-user LRU list maintenance */
 524           nat44_session_update_lru (sm, s, thread_index);
 525           return 1;
 526         }
 527       else
 528         return 0;
 529     }
 530
 531   return 0;
 532 }
 533
 534 static_always_inline int
 535 nat44_ed_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip,
 536                                        u8 proto, u16 src_port, u16 dst_port,
 537                                        u32 thread_index, u32 rx_sw_if_index,
 538                                        u32 tx_sw_if_index)
 539 {
 540   clib_bihash_kv_16_8_t kv, value;
 541   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 542   snat_interface_t *i;
 543   snat_session_t *s;
 544   u32 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (rx_sw_if_index);
 545   u32 tx_fib_index = ip4_fib_table_get_index_for_sw_if_index (tx_sw_if_index);
 546
 547   /* src NAT check */
 548   make_ed_kv (&kv, &ip->src_address, &ip->dst_address, proto, tx_fib_index,
 549               src_port, dst_port);
 550   if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
 551     {
 552       s = pool_elt_at_index (tsm->sessions, value.value);
 553       if (nat44_is_ses_closed (s))
 554         {
 555           nat_log_debug ("TCP close connection %U", format_snat_session,
 556                          &sm->per_thread_data[thread_index], s);
 557           nat_free_session_data (sm, s, thread_index);
 558           nat44_delete_session (sm, s, thread_index);
 559         }
 560       else
 561         s->flags |= SNAT_SESSION_FLAG_OUTPUT_FEATURE;
 562       return 1;
 563     }
 564
 565   /* dst NAT check */
 566   make_ed_kv (&kv, &ip->dst_address, &ip->src_address, proto, rx_fib_index,
 567               dst_port, src_port);
 568   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 569     {
 570       s = pool_elt_at_index (tsm->sessions, value.value);
 571       if (is_fwd_bypass_session (s))
 572         return 0;
 573
 574       /* hairpinning */
 575       /* *INDENT-OFF* */
 576       pool_foreach (i, sm->output_feature_interfaces,
 577       ({
 578         if ((nat_interface_is_inside (i)) && (rx_sw_if_index == i->sw_if_index))
 579            return 0;
 580       }));
 581       /* *INDENT-ON* */
 582       return 1;
 583     }
 584
 585   return 0;
 586 }
 587
 588 u32
 589 icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node,
 590                       u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip,
 591                       u8 * p_proto, snat_session_key_t * p_value,
 592                       u8 * p_dont_translate, void *d, void *e)
 593 {
 594   icmp46_header_t *icmp;
 595   u32 sw_if_index;
 596   u32 rx_fib_index;
 597   nat_ed_ses_key_t key;
 598   snat_session_t *s = 0;
 599   u8 dont_translate = 0;
 600   clib_bihash_kv_16_8_t kv, value;
 601   u32 next = ~0;
 602   int err;
 603   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 604
 605   icmp = (icmp46_header_t *) ip4_next_header (ip);
 606   sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
 607   rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
 608
 609   key.as_u64[0] = key.as_u64[1] = 0;
 610   err = icmp_get_ed_key (ip, &key);
 611   if (err != 0)
 612     {
 613       b->error = node->errors[err];
 614       next = NAT_IN2OUT_ED_NEXT_DROP;
 615       goto out;
 616     }
 617   key.fib_index = rx_fib_index;
 618
 619   kv.key[0] = key.as_u64[0];
 620   kv.key[1] = key.as_u64[1];
 621
 622   if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 623     {
 624       if (vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0)
 625         {
 626           if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (sm, ip,
 627                                                                     key.proto,
 628                                                                     key.
 629                                                                     l_port,
 630                                                                     key.
 631                                                                     r_port,
 632                                                                     thread_index,
 633                                                                     sw_if_index,
 634                                                                     vnet_buffer
 635                                                                     (b)->
 636                                                                     sw_if_index
 637                                                                     [VLIB_TX])))
 638             {
 639               dont_translate = 1;
 640               goto out;
 641             }
 642         }
 643       else
 644         {
 645           if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index,
 646                                                      ip, SNAT_PROTOCOL_ICMP,
 647                                                      rx_fib_index,
 648                                                      thread_index)))
 649             {
 650               dont_translate = 1;
 651               goto out;
 652             }
 653         }
 654
 655       if (PREDICT_FALSE (icmp_is_error_message (icmp)))
 656         {
 657           b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
 658           next = NAT_IN2OUT_ED_NEXT_DROP;
 659           goto out;
 660         }
 661
 662       next = slow_path_ed (sm, b, rx_fib_index, &kv, &s, node, next,
 663                            thread_index, vlib_time_now (sm->vlib_main), 0);
 664
 665       if (PREDICT_FALSE (next == NAT_IN2OUT_ED_NEXT_DROP))
 666         goto out;
 667
 668       if (!s)
 669         {
 670           dont_translate = 1;
 671           goto out;
 672         }
 673     }
 674   else
 675     {
 676       if (PREDICT_FALSE (icmp->type != ICMP4_echo_request &&
 677                          icmp->type != ICMP4_echo_reply &&
 678                          !icmp_is_error_message (icmp)))
 679         {
 680           b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
 681           next = NAT_IN2OUT_ED_NEXT_DROP;
 682           goto out;
 683         }
 684
 685       s = pool_elt_at_index (tsm->sessions, value.value);
 686     }
 687
 688   *p_proto = ip_proto_to_snat_proto (key.proto);
 689 out:
 690   if (s)
 691     *p_value = s->out2in;
 692   *p_dont_translate = dont_translate;
 693   if (d)
 694     *(snat_session_t **) d = s;
 695   return next;
 696 }
 697
 698 static snat_session_t *
 699 nat44_ed_in2out_unknown_proto (snat_main_t * sm,
 700                                vlib_buffer_t * b,
 701                                ip4_header_t * ip,
 702                                u32 rx_fib_index,
 703                                u32 thread_index,
 704                                f64 now,
 705                                vlib_main_t * vm, vlib_node_runtime_t * node)
 706 {
 707   clib_bihash_kv_8_8_t kv, value;
 708   clib_bihash_kv_16_8_t s_kv, s_value;
 709   snat_static_mapping_t *m;
 710   u32 old_addr, new_addr = 0;
 711   ip_csum_t sum;
 712   snat_user_t *u;
 713   dlist_elt_t *head, *elt;
 714   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 715   u32 elt_index, head_index, ses_index;
 716   snat_session_t *s;
 717   u32 outside_fib_index = sm->outside_fib_index;
 718   int i;
 719   u8 is_sm = 0;
 720   nat_outside_fib_t *outside_fib;
 721   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
 722   fib_prefix_t pfx = {
 723     .fp_proto = FIB_PROTOCOL_IP4,
 724     .fp_len = 32,
 725     .fp_addr = {
 726                 .ip4.as_u32 = ip->dst_address.as_u32,
 727                 },
 728   };
 729
 730   switch (vec_len (sm->outside_fibs))
 731     {
 732     case 0:
 733       outside_fib_index = sm->outside_fib_index;
 734       break;
 735     case 1:
 736       outside_fib_index = sm->outside_fibs[0].fib_index;
 737       break;
 738     default:
 739       /* *INDENT-OFF* */
 740       vec_foreach (outside_fib, sm->outside_fibs)
 741         {
 742           fei = fib_table_lookup (outside_fib->fib_index, &pfx);
 743           if (FIB_NODE_INDEX_INVALID != fei)
 744             {
 745               if (fib_entry_get_resolving_interface (fei) != ~0)
 746                 {
 747                   outside_fib_index = outside_fib->fib_index;
 748                   break;
 749                 }
 750             }
 751         }
 752       /* *INDENT-ON* */
 753       break;
 754     }
 755   old_addr = ip->src_address.as_u32;
 756
 757   make_ed_kv (&s_kv, &ip->src_address, &ip->dst_address, ip->protocol,
 758               rx_fib_index, 0, 0);
 759
 760   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &s_kv, &s_value))
 761     {
 762       s = pool_elt_at_index (tsm->sessions, s_value.value);
 763       new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
 764     }
 765   else
 766     {
 767       if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
 768         {
 769           b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
 770           nat_ipfix_logging_max_sessions (sm->max_translations);
 771           nat_log_notice ("maximum sessions exceeded");
 772           return 0;
 773         }
 774
 775       u = nat_user_get_or_create (sm, &ip->src_address, rx_fib_index,
 776                                   thread_index);
 777       if (!u)
 778         {
 779           nat_log_warn ("create NAT user failed");
 780           return 0;
 781         }
 782
 783       make_sm_kv (&kv, &ip->src_address, 0, rx_fib_index, 0);
 784
 785       /* Try to find static mapping first */
 786       if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
 787         {
 788           m = pool_elt_at_index (sm->static_mappings, value.value);
 789           new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
 790           is_sm = 1;
 791           goto create_ses;
 792         }
 793       /* Fallback to 3-tuple key */
 794       else
 795         {
 796           /* Choose same out address as for TCP/UDP session to same destination */
 797           head_index = u->sessions_per_user_list_head_index;
 798           head = pool_elt_at_index (tsm->list_pool, head_index);
 799           elt_index = head->next;
 800           if (PREDICT_FALSE (elt_index == ~0))
 801             ses_index = ~0;
 802           else
 803             {
 804               elt = pool_elt_at_index (tsm->list_pool, elt_index);
 805               ses_index = elt->value;
 806             }
 807
 808           while (ses_index != ~0)
 809             {
 810               s = pool_elt_at_index (tsm->sessions, ses_index);
 811               elt_index = elt->next;
 812               elt = pool_elt_at_index (tsm->list_pool, elt_index);
 813               ses_index = elt->value;
 814
 815               if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
 816                 {
 817                   new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
 818
 819                   make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address,
 820                               ip->protocol, outside_fib_index, 0, 0);
 821                   if (clib_bihash_search_16_8
 822                       (&tsm->out2in_ed, &s_kv, &s_value))
 823                     goto create_ses;
 824
 825                   break;
 826                 }
 827             }
 828
 829           for (i = 0; i < vec_len (sm->addresses); i++)
 830             {
 831               make_ed_kv (&s_kv, &sm->addresses[i].addr, &ip->dst_address,
 832                           ip->protocol, outside_fib_index, 0, 0);
 833               if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
 834                 {
 835                   new_addr = ip->src_address.as_u32 =
 836                     sm->addresses[i].addr.as_u32;
 837                   goto create_ses;
 838                 }
 839             }
 840           return 0;
 841         }
 842
 843     create_ses:
 844       s = nat_ed_session_alloc (sm, u, thread_index, now);
 845       if (!s)
 846         {
 847           nat44_delete_user_with_no_session (sm, u, thread_index);
 848           nat_log_warn ("create NAT session failed");
 849           return 0;
 850         }
 851
 852       s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
 853       s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
 854       s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
 855       s->out2in.addr.as_u32 = new_addr;
 856       s->out2in.fib_index = outside_fib_index;
 857       s->in2out.addr.as_u32 = old_addr;
 858       s->in2out.fib_index = rx_fib_index;
 859       s->in2out.port = s->out2in.port = ip->protocol;
 860       if (is_sm)
 861         s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
 862       user_session_increment (sm, u, is_sm);
 863
 864       /* Add to lookup tables */
 865       make_ed_kv (&s_kv, &s->in2out.addr, &ip->dst_address, ip->protocol,
 866                   rx_fib_index, 0, 0);
 867       s_kv.value = s - tsm->sessions;
 868       if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1))
 869         nat_log_notice ("in2out key add failed");
 870
 871       make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address, ip->protocol,
 872                   outside_fib_index, 0, 0);
 873       s_kv.value = s - tsm->sessions;
 874       if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1))
 875         nat_log_notice ("out2in key add failed");
 876     }
 877
 878   /* Update IP checksum */
 879   sum = ip->checksum;
 880   sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
 881   ip->checksum = ip_csum_fold (sum);
 882
 883   /* Accounting */
 884   nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b));
 885   /* Per-user LRU list maintenance */
 886   nat44_session_update_lru (sm, s, thread_index);
 887
 888   /* Hairpinning */
 889   if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
 890     nat44_ed_hairpinning_unknown_proto (sm, b, ip);
 891
 892   if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
 893     vnet_buffer (b)->sw_if_index[VLIB_TX] = outside_fib_index;
 894
 895   return s;
 896 }
 897
 898 static inline uword
 899 nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
 900                                 vlib_node_runtime_t * node,
 901                                 vlib_frame_t * frame, int is_slow_path,
 902                                 int is_output_feature)
 903 {
 904   u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
 905   nat_in2out_ed_next_t next_index;
 906   snat_main_t *sm = &snat_main;
 907   f64 now = vlib_time_now (vm);
 908   u32 thread_index = vm->thread_index;
 909   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 910   u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
 911     0, fragments = 0;
 912
 913   stats_node_index = is_slow_path ? nat44_ed_in2out_slowpath_node.index :
 914     nat44_ed_in2out_node.index;
 915
 916   from = vlib_frame_vector_args (frame);
 917   n_left_from = frame->n_vectors;
 918   next_index = node->cached_next_index;
 919
 920   while (n_left_from > 0)
 921     {
 922       u32 n_left_to_next;
 923
 924       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 925
 926       while (n_left_from >= 4 && n_left_to_next >= 2)
 927         {
 928           u32 bi0, bi1;
 929           vlib_buffer_t *b0, *b1;
 930           u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
 931             new_addr0, old_addr0;
 932           u32 next1, sw_if_index1, rx_fib_index1, iph_offset1 = 0, proto1,
 933             new_addr1, old_addr1;
 934           u16 old_port0, new_port0, old_port1, new_port1;
 935           ip4_header_t *ip0, *ip1;
 936           udp_header_t *udp0, *udp1;
 937           tcp_header_t *tcp0, *tcp1;
 938           icmp46_header_t *icmp0, *icmp1;
 939           snat_session_t *s0 = 0, *s1 = 0;
 940           clib_bihash_kv_16_8_t kv0, value0, kv1, value1;
 941           ip_csum_t sum0, sum1;
 942
 943           /* Prefetch next iteration. */
 944           {
 945             vlib_buffer_t *p2, *p3;
 946
 947             p2 = vlib_get_buffer (vm, from[2]);
 948             p3 = vlib_get_buffer (vm, from[3]);
 949
 950             vlib_prefetch_buffer_header (p2, LOAD);
 951             vlib_prefetch_buffer_header (p3, LOAD);
 952
 953             CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
 954             CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
 955           }
 956
 957           /* speculatively enqueue b0 and b1 to the current next frame */
 958           to_next[0] = bi0 = from[0];
 959           to_next[1] = bi1 = from[1];
 960           from += 2;
 961           to_next += 2;
 962           n_left_from -= 2;
 963           n_left_to_next -= 2;
 964
 965           b0 = vlib_get_buffer (vm, bi0);
 966           b1 = vlib_get_buffer (vm, bi1);
 967
 968           next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
 969
 970           if (is_output_feature)
 971             iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
 972
 973           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
 974                                   iph_offset0);
 975
 976           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 977           rx_fib_index0 =
 978             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
 979                                                  sw_if_index0);
 980
 981           if (PREDICT_FALSE (ip0->ttl == 1))
 982             {
 983               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 984               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
 985                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
 986                                            0);
 987               next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
 988               goto trace00;
 989             }
 990
 991           udp0 = ip4_next_header (ip0);
 992           tcp0 = (tcp_header_t *) udp0;
 993           icmp0 = (icmp46_header_t *) udp0;
 994           proto0 = ip_proto_to_snat_proto (ip0->protocol);
 995
 996           if (is_slow_path)
 997             {
 998               if (PREDICT_FALSE (proto0 == ~0))
 999                 {
1000                   s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
1001                                                       rx_fib_index0,
1002                                                       thread_index, now, vm,
1003                                                       node);
1004                   if (!s0)
1005                     next0 = NAT_IN2OUT_ED_NEXT_DROP;
1006                   other_packets++;
1007                   goto trace00;
1008                 }
1009
1010               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1011                 {
1012                   next0 = icmp_in2out_ed_slow_path
1013                     (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1014                      next0, now, thread_index, &s0);
1015                   icmp_packets++;
1016                   goto trace00;
1017                 }
1018             }
1019           else
1020             {
1021               if (PREDICT_FALSE (proto0 == ~0))
1022                 {
1023                   next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1024                   goto trace00;
1025                 }
1026
1027               if (ip4_is_fragment (ip0))
1028                 {
1029                   next0 = NAT_IN2OUT_ED_NEXT_REASS;
1030                   fragments++;
1031                   goto trace00;
1032                 }
1033
1034               if (is_output_feature)
1035                 {
1036                   if (PREDICT_FALSE
1037                       (nat_not_translate_output_feature_fwd
1038                        (sm, ip0, thread_index, now, vm, b0)))
1039                     goto trace00;
1040                 }
1041
1042               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1043                 {
1044                   next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1045                   goto trace00;
1046                 }
1047             }
1048
1049           make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1050                       ip0->protocol, rx_fib_index0, udp0->src_port,
1051                       udp0->dst_port);
1052
1053           if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1054             {
1055               if (is_slow_path)
1056                 {
1057                   if (is_output_feature)
1058                     {
1059                       if (PREDICT_FALSE
1060                           (nat44_ed_not_translate_output_feature
1061                            (sm, ip0, ip0->protocol, udp0->src_port,
1062                             udp0->dst_port, thread_index, sw_if_index0,
1063                             vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1064                         goto trace00;
1065                     }
1066                   else
1067                     {
1068                       if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1069                                                                  sw_if_index0,
1070                                                                  ip0, proto0,
1071                                                                  rx_fib_index0,
1072                                                                  thread_index)))
1073                         goto trace00;
1074                     }
1075
1076                   next0 =
1077                     slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1078                                   next0, thread_index, now, tcp0);
1079
1080                   if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1081                     goto trace00;
1082
1083                   if (PREDICT_FALSE (!s0))
1084                     goto trace00;
1085                 }
1086               else
1087                 {
1088                   next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1089                   goto trace00;
1090                 }
1091             }
1092           else
1093             {
1094               s0 = pool_elt_at_index (tsm->sessions, value0.value);
1095             }
1096
1097           b0->flags |= VNET_BUFFER_F_IS_NATED;
1098
1099           if (!is_output_feature)
1100             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1101
1102           old_addr0 = ip0->src_address.as_u32;
1103           new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1104           sum0 = ip0->checksum;
1105           sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1106                                  src_address);
1107           if (PREDICT_FALSE (is_twice_nat_session (s0)))
1108             sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1109                                    s0->ext_host_addr.as_u32, ip4_header_t,
1110                                    dst_address);
1111           ip0->checksum = ip_csum_fold (sum0);
1112
1113           if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1114             {
1115               old_port0 = tcp0->src_port;
1116               new_port0 = tcp0->src_port = s0->out2in.port;
1117
1118               sum0 = tcp0->checksum;
1119               sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1120                                      dst_address);
1121               sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1122                                      length);
1123               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1124                 {
1125                   sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1126                                          s0->ext_host_addr.as_u32,
1127                                          ip4_header_t, dst_address);
1128                   sum0 = ip_csum_update (sum0, tcp0->dst_port,
1129                                          s0->ext_host_port, ip4_header_t,
1130                                          length);
1131                   tcp0->dst_port = s0->ext_host_port;
1132                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1133                 }
1134               mss_clamping (sm, tcp0, &sum0);
1135               tcp0->checksum = ip_csum_fold (sum0);
1136               tcp_packets++;
1137               if (nat44_set_tcp_session_state_i2o
1138                   (sm, s0, tcp0, thread_index))
1139                 goto trace00;
1140             }
1141           else
1142             {
1143               udp0->src_port = s0->out2in.port;
1144               udp0->checksum = 0;
1145               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1146                 {
1147                   udp0->dst_port = s0->ext_host_port;
1148                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1149                 }
1150               udp_packets++;
1151             }
1152
1153           /* Accounting */
1154           nat44_session_update_counters (s0, now,
1155                                          vlib_buffer_length_in_chain (vm,
1156                                                                       b0));
1157           /* Per-user LRU list maintenance */
1158           nat44_session_update_lru (sm, s0, thread_index);
1159
1160         trace00:
1161           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1162                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1163             {
1164               nat_in2out_ed_trace_t *t =
1165                 vlib_add_trace (vm, node, b0, sizeof (*t));
1166               t->is_slow_path = is_slow_path;
1167               t->sw_if_index = sw_if_index0;
1168               t->next_index = next0;
1169               t->session_index = ~0;
1170               if (s0)
1171                 t->session_index = s0 - tsm->sessions;
1172             }
1173
1174           pkts_processed += next0 == NAT_IN2OUT_ED_NEXT_LOOKUP;
1175
1176
1177           next1 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1178
1179           if (is_output_feature)
1180             iph_offset1 = vnet_buffer (b1)->ip.save_rewrite_length;
1181
1182           ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
1183                                   iph_offset1);
1184
1185           sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
1186           rx_fib_index1 =
1187             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1188                                                  sw_if_index1);
1189
1190           if (PREDICT_FALSE (ip1->ttl == 1))
1191             {
1192               vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1193               icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
1194                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
1195                                            0);
1196               next1 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
1197               goto trace01;
1198             }
1199
1200           udp1 = ip4_next_header (ip1);
1201           tcp1 = (tcp_header_t *) udp1;
1202           icmp1 = (icmp46_header_t *) udp1;
1203           proto1 = ip_proto_to_snat_proto (ip1->protocol);
1204
1205           if (is_slow_path)
1206             {
1207               if (PREDICT_FALSE (proto1 == ~0))
1208                 {
1209                   s1 = nat44_ed_in2out_unknown_proto (sm, b1, ip1,
1210                                                       rx_fib_index1,
1211                                                       thread_index, now, vm,
1212                                                       node);
1213                   if (!s1)
1214                     next1 = NAT_IN2OUT_ED_NEXT_DROP;
1215                   other_packets++;
1216                   goto trace01;
1217                 }
1218
1219               if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1220                 {
1221                   next1 = icmp_in2out_ed_slow_path
1222                     (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
1223                      next1, now, thread_index, &s1);
1224                   icmp_packets++;
1225                   goto trace01;
1226                 }
1227             }
1228           else
1229             {
1230               if (PREDICT_FALSE (proto1 == ~0))
1231                 {
1232                   next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1233                   goto trace01;
1234                 }
1235
1236               if (ip4_is_fragment (ip1))
1237                 {
1238                   next1 = NAT_IN2OUT_ED_NEXT_REASS;
1239                   fragments++;
1240                   goto trace01;
1241                 }
1242
1243               if (is_output_feature)
1244                 {
1245                   if (PREDICT_FALSE
1246                       (nat_not_translate_output_feature_fwd
1247                        (sm, ip1, thread_index, now, vm, b1)))
1248                     goto trace01;
1249                 }
1250
1251               if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1252                 {
1253                   next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1254                   goto trace01;
1255                 }
1256             }
1257
1258           make_ed_kv (&kv1, &ip1->src_address, &ip1->dst_address,
1259                       ip1->protocol, rx_fib_index1, udp1->src_port,
1260                       udp1->dst_port);
1261
1262           if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv1, &value1))
1263             {
1264               if (is_slow_path)
1265                 {
1266                   if (is_output_feature)
1267                     {
1268                       if (PREDICT_FALSE
1269                           (nat44_ed_not_translate_output_feature
1270                            (sm, ip1, ip1->protocol, udp1->src_port,
1271                             udp1->dst_port, thread_index, sw_if_index1,
1272                             vnet_buffer (b1)->sw_if_index[VLIB_TX])))
1273                         goto trace01;
1274                     }
1275                   else
1276                     {
1277                       if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1278                                                                  sw_if_index1,
1279                                                                  ip1, proto1,
1280                                                                  rx_fib_index1,
1281                                                                  thread_index)))
1282                         goto trace01;
1283                     }
1284
1285                   next1 =
1286                     slow_path_ed (sm, b1, rx_fib_index1, &kv1, &s1, node,
1287                                   next1, thread_index, now, tcp1);
1288
1289                   if (PREDICT_FALSE (next1 == NAT_IN2OUT_ED_NEXT_DROP))
1290                     goto trace01;
1291
1292                   if (PREDICT_FALSE (!s1))
1293                     goto trace01;
1294                 }
1295               else
1296                 {
1297                   next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1298                   goto trace01;
1299                 }
1300             }
1301           else
1302             {
1303               s1 = pool_elt_at_index (tsm->sessions, value1.value);
1304             }
1305
1306           b1->flags |= VNET_BUFFER_F_IS_NATED;
1307
1308           if (!is_output_feature)
1309             vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
1310
1311           old_addr1 = ip1->src_address.as_u32;
1312           new_addr1 = ip1->src_address.as_u32 = s1->out2in.addr.as_u32;
1313           sum1 = ip1->checksum;
1314           sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1315                                  src_address);
1316           if (PREDICT_FALSE (is_twice_nat_session (s1)))
1317             sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1318                                    s1->ext_host_addr.as_u32, ip4_header_t,
1319                                    dst_address);
1320           ip1->checksum = ip_csum_fold (sum1);
1321
1322           if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1323             {
1324               old_port1 = tcp1->src_port;
1325               new_port1 = tcp1->src_port = s1->out2in.port;
1326
1327               sum1 = tcp1->checksum;
1328               sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1329                                      dst_address);
1330               sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t,
1331                                      length);
1332               if (PREDICT_FALSE (is_twice_nat_session (s1)))
1333                 {
1334                   sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1335                                          s1->ext_host_addr.as_u32,
1336                                          ip4_header_t, dst_address);
1337                   sum1 = ip_csum_update (sum1, tcp1->dst_port,
1338                                          s1->ext_host_port, ip4_header_t,
1339                                          length);
1340                   tcp1->dst_port = s1->ext_host_port;
1341                   ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1342                 }
1343               tcp1->checksum = ip_csum_fold (sum1);
1344               mss_clamping (sm, tcp1, &sum1);
1345               tcp_packets++;
1346               if (nat44_set_tcp_session_state_i2o
1347                   (sm, s1, tcp1, thread_index))
1348                 goto trace01;
1349             }
1350           else
1351             {
1352               udp1->src_port = s1->out2in.port;
1353               udp1->checksum = 0;
1354               if (PREDICT_FALSE (is_twice_nat_session (s1)))
1355                 {
1356                   udp1->dst_port = s1->ext_host_port;
1357                   ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1358                 }
1359               udp_packets++;
1360             }
1361
1362           /* Accounting */
1363           nat44_session_update_counters (s1, now,
1364                                          vlib_buffer_length_in_chain (vm,
1365                                                                       b1));
1366           /* Per-user LRU list maintenance */
1367           nat44_session_update_lru (sm, s1, thread_index);
1368
1369         trace01:
1370           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1371                              && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1372             {
1373               nat_in2out_ed_trace_t *t =
1374                 vlib_add_trace (vm, node, b1, sizeof (*t));
1375               t->is_slow_path = is_slow_path;
1376               t->sw_if_index = sw_if_index1;
1377               t->next_index = next1;
1378               t->session_index = ~0;
1379               if (s1)
1380                 t->session_index = s1 - tsm->sessions;
1381             }
1382
1383           pkts_processed += next1 == NAT_IN2OUT_ED_NEXT_LOOKUP;
1384
1385           /* verify speculative enqueues, maybe switch current next frame */
1386           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1387                                            to_next, n_left_to_next,
1388                                            bi0, bi1, next0, next1);
1389         }
1390
1391       while (n_left_from > 0 && n_left_to_next > 0)
1392         {
1393           u32 bi0;
1394           vlib_buffer_t *b0;
1395           u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
1396             new_addr0, old_addr0;
1397           u16 old_port0, new_port0;
1398           ip4_header_t *ip0;
1399           udp_header_t *udp0;
1400           tcp_header_t *tcp0;
1401           icmp46_header_t *icmp0;
1402           snat_session_t *s0 = 0;
1403           clib_bihash_kv_16_8_t kv0, value0;
1404           ip_csum_t sum0;
1405
1406           /* speculatively enqueue b0 to the current next frame */
1407           bi0 = from[0];
1408           to_next[0] = bi0;
1409           from += 1;
1410           to_next += 1;
1411           n_left_from -= 1;
1412           n_left_to_next -= 1;
1413
1414           b0 = vlib_get_buffer (vm, bi0);
1415           next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1416
1417           if (is_output_feature)
1418             iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1419
1420           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1421                                   iph_offset0);
1422
1423           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1424           rx_fib_index0 =
1425             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1426                                                  sw_if_index0);
1427
1428           if (PREDICT_FALSE (ip0->ttl == 1))
1429             {
1430               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1431               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1432                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
1433                                            0);
1434               next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
1435               goto trace0;
1436             }
1437
1438           udp0 = ip4_next_header (ip0);
1439           tcp0 = (tcp_header_t *) udp0;
1440           icmp0 = (icmp46_header_t *) udp0;
1441           proto0 = ip_proto_to_snat_proto (ip0->protocol);
1442
1443           if (is_slow_path)
1444             {
1445               if (PREDICT_FALSE (proto0 == ~0))
1446                 {
1447                   s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
1448                                                       rx_fib_index0,
1449                                                       thread_index, now, vm,
1450                                                       node);
1451                   if (!s0)
1452                     next0 = NAT_IN2OUT_ED_NEXT_DROP;
1453                   other_packets++;
1454                   goto trace0;
1455                 }
1456
1457               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1458                 {
1459                   next0 = icmp_in2out_ed_slow_path
1460                     (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1461                      next0, now, thread_index, &s0);
1462                   icmp_packets++;
1463                   goto trace0;
1464                 }
1465             }
1466           else
1467             {
1468               if (PREDICT_FALSE (proto0 == ~0))
1469                 {
1470                   next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1471                   goto trace0;
1472                 }
1473
1474               if (ip4_is_fragment (ip0))
1475                 {
1476                   next0 = NAT_IN2OUT_ED_NEXT_REASS;
1477                   fragments++;
1478                   goto trace0;
1479                 }
1480
1481               if (is_output_feature)
1482                 {
1483                   if (PREDICT_FALSE
1484                       (nat_not_translate_output_feature_fwd
1485                        (sm, ip0, thread_index, now, vm, b0)))
1486                     goto trace0;
1487                 }
1488
1489               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1490                 {
1491                   next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1492                   goto trace0;
1493                 }
1494             }
1495
1496           make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1497                       ip0->protocol, rx_fib_index0, udp0->src_port,
1498                       udp0->dst_port);
1499
1500           if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1501             {
1502               if (is_slow_path)
1503                 {
1504                   if (is_output_feature)
1505                     {
1506                       if (PREDICT_FALSE
1507                           (nat44_ed_not_translate_output_feature
1508                            (sm, ip0, ip0->protocol, udp0->src_port,
1509                             udp0->dst_port, thread_index, sw_if_index0,
1510                             vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1511                         goto trace0;
1512                     }
1513                   else
1514                     {
1515                       if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1516                                                                  sw_if_index0,
1517                                                                  ip0, proto0,
1518                                                                  rx_fib_index0,
1519                                                                  thread_index)))
1520                         goto trace0;
1521                     }
1522
1523                   next0 =
1524                     slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1525                                   next0, thread_index, now, tcp0);
1526
1527                   if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1528                     goto trace0;
1529
1530                   if (PREDICT_FALSE (!s0))
1531                     goto trace0;
1532                 }
1533               else
1534                 {
1535                   next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1536                   goto trace0;
1537                 }
1538             }
1539           else
1540             {
1541               s0 = pool_elt_at_index (tsm->sessions, value0.value);
1542             }
1543
1544           b0->flags |= VNET_BUFFER_F_IS_NATED;
1545
1546           if (!is_output_feature)
1547             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1548
1549           old_addr0 = ip0->src_address.as_u32;
1550           new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1551           sum0 = ip0->checksum;
1552           sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1553                                  src_address);
1554           if (PREDICT_FALSE (is_twice_nat_session (s0)))
1555             sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1556                                    s0->ext_host_addr.as_u32, ip4_header_t,
1557                                    dst_address);
1558           ip0->checksum = ip_csum_fold (sum0);
1559
1560           if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1561             {
1562               old_port0 = tcp0->src_port;
1563               new_port0 = tcp0->src_port = s0->out2in.port;
1564
1565               sum0 = tcp0->checksum;
1566               sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1567                                      dst_address);
1568               sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1569                                      length);
1570               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1571                 {
1572                   sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1573                                          s0->ext_host_addr.as_u32,
1574                                          ip4_header_t, dst_address);
1575                   sum0 = ip_csum_update (sum0, tcp0->dst_port,
1576                                          s0->ext_host_port, ip4_header_t,
1577                                          length);
1578                   tcp0->dst_port = s0->ext_host_port;
1579                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1580                 }
1581               mss_clamping (sm, tcp0, &sum0);
1582               tcp0->checksum = ip_csum_fold (sum0);
1583               tcp_packets++;
1584               if (nat44_set_tcp_session_state_i2o
1585                   (sm, s0, tcp0, thread_index))
1586                 goto trace0;
1587             }
1588           else
1589             {
1590               udp0->src_port = s0->out2in.port;
1591               udp0->checksum = 0;
1592               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1593                 {
1594                   udp0->dst_port = s0->ext_host_port;
1595                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1596                 }
1597               udp_packets++;
1598             }
1599
1600           /* Accounting */
1601           nat44_session_update_counters (s0, now,
1602                                          vlib_buffer_length_in_chain (vm,
1603                                                                       b0));
1604           /* Per-user LRU list maintenance */
1605           nat44_session_update_lru (sm, s0, thread_index);
1606
1607         trace0:
1608           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1609                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1610             {
1611               nat_in2out_ed_trace_t *t =
1612                 vlib_add_trace (vm, node, b0, sizeof (*t));
1613               t->is_slow_path = is_slow_path;
1614               t->sw_if_index = sw_if_index0;
1615               t->next_index = next0;
1616               t->session_index = ~0;
1617               if (s0)
1618                 t->session_index = s0 - tsm->sessions;
1619             }
1620
1621           pkts_processed += next0 == NAT_IN2OUT_ED_NEXT_LOOKUP;
1622
1623           /* verify speculative enqueue, maybe switch current next frame */
1624           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1625                                            to_next, n_left_to_next,
1626                                            bi0, next0);
1627         }
1628
1629       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1630     }
1631
1632   vlib_node_increment_counter (vm, stats_node_index,
1633                                NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
1634                                pkts_processed);
1635   vlib_node_increment_counter (vm, stats_node_index,
1636                                NAT_IN2OUT_ED_ERROR_TCP_PACKETS, tcp_packets);
1637   vlib_node_increment_counter (vm, stats_node_index,
1638                                NAT_IN2OUT_ED_ERROR_UDP_PACKETS, tcp_packets);
1639   vlib_node_increment_counter (vm, stats_node_index,
1640                                NAT_IN2OUT_ED_ERROR_ICMP_PACKETS,
1641                                icmp_packets);
1642   vlib_node_increment_counter (vm, stats_node_index,
1643                                NAT_IN2OUT_ED_ERROR_OTHER_PACKETS,
1644                                other_packets);
1645   vlib_node_increment_counter (vm, stats_node_index,
1646                                NAT_IN2OUT_ED_ERROR_FRAGMENTS, fragments);
1647
1648   return frame->n_vectors;
1649 }
1650
1651 static uword
1652 nat44_ed_in2out_fast_path_fn (vlib_main_t * vm,
1653                               vlib_node_runtime_t * node,
1654                               vlib_frame_t * frame)
1655 {
1656   return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 0);
1657 }
1658
1659 /* *INDENT-OFF* */
1660 VLIB_REGISTER_NODE (nat44_ed_in2out_node) = {
1661   .function = nat44_ed_in2out_fast_path_fn,
1662   .name = "nat44-ed-in2out",
1663   .vector_size = sizeof (u32),
1664   .format_trace = format_nat_in2out_ed_trace,
1665   .type = VLIB_NODE_TYPE_INTERNAL,
1666   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1667   .error_strings = nat_in2out_ed_error_strings,
1668   .runtime_data_bytes = sizeof (snat_runtime_t),
1669   .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1670   .next_nodes = {
1671     [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1672     [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
1673     [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath",
1674     [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1675     [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1676   },
1677 };
1678 /* *INDENT-ON* */
1679
1680 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_node,
1681                               nat44_ed_in2out_fast_path_fn);
1682
1683 static uword
1684 nat44_ed_in2out_output_fast_path_fn (vlib_main_t * vm,
1685                                      vlib_node_runtime_t * node,
1686                                      vlib_frame_t * frame)
1687 {
1688   return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 1);
1689 }
1690
1691 /* *INDENT-OFF* */
1692 VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = {
1693   .function = nat44_ed_in2out_output_fast_path_fn,
1694   .name = "nat44-ed-in2out-output",
1695   .vector_size = sizeof (u32),
1696   .format_trace = format_nat_in2out_ed_trace,
1697   .type = VLIB_NODE_TYPE_INTERNAL,
1698   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1699   .error_strings = nat_in2out_ed_error_strings,
1700   .runtime_data_bytes = sizeof (snat_runtime_t),
1701   .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1702   .next_nodes = {
1703     [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1704     [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
1705     [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath",
1706     [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1707     [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass-output",
1708   },
1709 };
1710 /* *INDENT-ON* */
1711
1712 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_node,
1713                               nat44_ed_in2out_output_fast_path_fn);
1714
1715 static uword
1716 nat44_ed_in2out_slow_path_fn (vlib_main_t * vm,
1717                               vlib_node_runtime_t * node,
1718                               vlib_frame_t * frame)
1719 {
1720   return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 0);
1721 }
1722
1723 /* *INDENT-OFF* */
1724 VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = {
1725   .function = nat44_ed_in2out_slow_path_fn,
1726   .name = "nat44-ed-in2out-slowpath",
1727   .vector_size = sizeof (u32),
1728   .format_trace = format_nat_in2out_ed_trace,
1729   .type = VLIB_NODE_TYPE_INTERNAL,
1730   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1731   .error_strings = nat_in2out_ed_error_strings,
1732   .runtime_data_bytes = sizeof (snat_runtime_t),
1733   .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1734   .next_nodes = {
1735     [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1736     [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
1737     [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath",
1738     [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1739     [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1740   },
1741 };
1742 /* *INDENT-ON* */
1743
1744 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_slowpath_node,
1745                               nat44_ed_in2out_slow_path_fn);
1746
1747 static uword
1748 nat44_ed_in2out_output_slow_path_fn (vlib_main_t * vm,
1749                                      vlib_node_runtime_t * node,
1750                                      vlib_frame_t * frame)
1751 {
1752   return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 1);
1753 }
1754
1755 /* *INDENT-OFF* */
1756 VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = {
1757   .function = nat44_ed_in2out_output_slow_path_fn,
1758   .name = "nat44-ed-in2out-output-slowpath",
1759   .vector_size = sizeof (u32),
1760   .format_trace = format_nat_in2out_ed_trace,
1761   .type = VLIB_NODE_TYPE_INTERNAL,
1762   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1763   .error_strings = nat_in2out_ed_error_strings,
1764   .runtime_data_bytes = sizeof (snat_runtime_t),
1765   .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1766   .next_nodes = {
1767     [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1768     [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
1769     [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath",
1770     [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1771     [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1772   },
1773 };
1774 /* *INDENT-ON* */
1775
1776 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_slowpath_node,
1777                               nat44_ed_in2out_output_slow_path_fn);
1778
1779 static inline uword
1780 nat44_ed_in2out_reass_node_fn_inline (vlib_main_t * vm,
1781                                       vlib_node_runtime_t * node,
1782                                       vlib_frame_t * frame,
1783                                       int is_output_feature)
1784 {
1785   u32 n_left_from, *from, *to_next;
1786   nat_in2out_ed_next_t next_index;
1787   u32 pkts_processed = 0, cached_fragments = 0;
1788   snat_main_t *sm = &snat_main;
1789   f64 now = vlib_time_now (vm);
1790   u32 thread_index = vm->thread_index;
1791   snat_main_per_thread_data_t *per_thread_data =
1792     &sm->per_thread_data[thread_index];
1793   u32 *fragments_to_drop = 0;
1794   u32 *fragments_to_loopback = 0;
1795
1796   from = vlib_frame_vector_args (frame);
1797   n_left_from = frame->n_vectors;
1798   next_index = node->cached_next_index;
1799
1800   while (n_left_from > 0)
1801     {
1802       u32 n_left_to_next;
1803
1804       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1805
1806       while (n_left_from > 0 && n_left_to_next > 0)
1807         {
1808           u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
1809           u32 iph_offset0 = 0;
1810           vlib_buffer_t *b0;
1811           u32 next0;
1812           u8 cached0 = 0;
1813           ip4_header_t *ip0 = 0;
1814           nat_reass_ip4_t *reass0;
1815           udp_header_t *udp0;
1816           tcp_header_t *tcp0;
1817           icmp46_header_t *icmp0;
1818           clib_bihash_kv_16_8_t kv0, value0;
1819           snat_session_t *s0 = 0;
1820           u16 old_port0, new_port0;
1821           ip_csum_t sum0;
1822
1823           /* speculatively enqueue b0 to the current next frame */
1824           bi0 = from[0];
1825           to_next[0] = bi0;
1826           from += 1;
1827           to_next += 1;
1828           n_left_from -= 1;
1829           n_left_to_next -= 1;
1830
1831           b0 = vlib_get_buffer (vm, bi0);
1832
1833           next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1834
1835           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1836           rx_fib_index0 =
1837             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1838                                                  sw_if_index0);
1839
1840           if (PREDICT_FALSE (nat_reass_is_drop_frag (0)))
1841             {
1842               next0 = NAT_IN2OUT_ED_NEXT_DROP;
1843               b0->error = node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT];
1844               goto trace0;
1845             }
1846
1847           if (is_output_feature)
1848             iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1849
1850           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1851                                   iph_offset0);
1852
1853           udp0 = ip4_next_header (ip0);
1854           tcp0 = (tcp_header_t *) udp0;
1855           icmp0 = (icmp46_header_t *) udp0;
1856           proto0 = ip_proto_to_snat_proto (ip0->protocol);
1857
1858           reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
1859                                                  ip0->dst_address,
1860                                                  ip0->fragment_id,
1861                                                  ip0->protocol,
1862                                                  1, &fragments_to_drop);
1863
1864           if (PREDICT_FALSE (!reass0))
1865             {
1866               next0 = NAT_IN2OUT_ED_NEXT_DROP;
1867               b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_REASS];
1868               nat_log_notice ("maximum reassemblies exceeded");
1869               goto trace0;
1870             }
1871
1872           if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1873             {
1874               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1875                 {
1876                   if (is_output_feature)
1877                     {
1878                       if (PREDICT_FALSE
1879                           (nat_not_translate_output_feature_fwd
1880                            (sm, ip0, thread_index, now, vm, b0)))
1881                         reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1882                       goto trace0;
1883                     }
1884
1885                   next0 = icmp_in2out_ed_slow_path
1886                     (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1887                      next0, now, thread_index, &s0);
1888
1889                   if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP))
1890                     {
1891                       if (s0)
1892                         reass0->sess_index = s0 - per_thread_data->sessions;
1893                       else
1894                         reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1895                       nat_ip4_reass_get_frags (reass0,
1896                                                &fragments_to_loopback);
1897                     }
1898
1899                   goto trace0;
1900                 }
1901
1902               make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1903                           ip0->protocol, rx_fib_index0, udp0->src_port,
1904                           udp0->dst_port);
1905
1906               if (clib_bihash_search_16_8
1907                   (&per_thread_data->in2out_ed, &kv0, &value0))
1908                 {
1909                   if (is_output_feature)
1910                     {
1911                       if (PREDICT_FALSE
1912                           (nat44_ed_not_translate_output_feature
1913                            (sm, ip0, ip0->protocol, udp0->src_port,
1914                             udp0->dst_port, thread_index, sw_if_index0,
1915                             vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1916                         {
1917                           reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1918                           nat_ip4_reass_get_frags (reass0,
1919                                                    &fragments_to_loopback);
1920                           goto trace0;
1921                         }
1922                     }
1923                   else
1924                     {
1925                       if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1926                                                                  sw_if_index0,
1927                                                                  ip0, proto0,
1928                                                                  rx_fib_index0,
1929                                                                  thread_index)))
1930                         {
1931                           reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1932                           nat_ip4_reass_get_frags (reass0,
1933                                                    &fragments_to_loopback);
1934                           goto trace0;
1935                         }
1936                     }
1937
1938                   next0 = slow_path_ed (sm, b0, rx_fib_index0, &kv0,
1939                                         &s0, node, next0, thread_index, now,
1940                                         tcp0);
1941
1942                   if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1943                     goto trace0;
1944
1945                   if (PREDICT_FALSE (!s0))
1946                     {
1947                       reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1948                       goto trace0;
1949                     }
1950
1951                   reass0->sess_index = s0 - per_thread_data->sessions;
1952                 }
1953               else
1954                 {
1955                   s0 = pool_elt_at_index (per_thread_data->sessions,
1956                                           value0.value);
1957                   reass0->sess_index = value0.value;
1958                 }
1959               nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
1960             }
1961           else
1962             {
1963               if (reass0->flags & NAT_REASS_FLAG_ED_DONT_TRANSLATE)
1964                 goto trace0;
1965               if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
1966                 {
1967                   if (nat_ip4_reass_add_fragment
1968                       (reass0, bi0, &fragments_to_drop))
1969                     {
1970                       b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_FRAG];
1971                       nat_log_notice
1972                         ("maximum fragments per reassembly exceeded");
1973                       next0 = NAT_IN2OUT_ED_NEXT_DROP;
1974                       goto trace0;
1975                     }
1976                   cached0 = 1;
1977                   goto trace0;
1978                 }
1979               s0 = pool_elt_at_index (per_thread_data->sessions,
1980                                       reass0->sess_index);
1981             }
1982
1983           old_addr0 = ip0->src_address.as_u32;
1984           ip0->src_address = s0->out2in.addr;
1985           new_addr0 = ip0->src_address.as_u32;
1986           if (!is_output_feature)
1987             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1988
1989           sum0 = ip0->checksum;
1990           sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1991                                  ip4_header_t,
1992                                  src_address /* changed member */ );
1993           if (PREDICT_FALSE (is_twice_nat_session (s0)))
1994             sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1995                                    s0->ext_host_addr.as_u32, ip4_header_t,
1996                                    dst_address);
1997           ip0->checksum = ip_csum_fold (sum0);
1998
1999           if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
2000             {
2001               if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
2002                 {
2003                   old_port0 = tcp0->src_port;
2004                   tcp0->src_port = s0->out2in.port;
2005                   new_port0 = tcp0->src_port;
2006
2007                   sum0 = tcp0->checksum;
2008                   sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
2009                                          ip4_header_t,
2010                                          dst_address /* changed member */ );
2011                   sum0 = ip_csum_update (sum0, old_port0, new_port0,
2012                                          ip4_header_t /* cheat */ ,
2013                                          length /* changed member */ );
2014                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
2015                     {
2016                       sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
2017                                              s0->ext_host_addr.as_u32,
2018                                              ip4_header_t, dst_address);
2019                       sum0 = ip_csum_update (sum0, tcp0->dst_port,
2020                                              s0->ext_host_port, ip4_header_t,
2021                                              length);
2022                       tcp0->dst_port = s0->ext_host_port;
2023                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
2024                     }
2025                   tcp0->checksum = ip_csum_fold (sum0);
2026                 }
2027               else
2028                 {
2029                   old_port0 = udp0->src_port;
2030                   udp0->src_port = s0->out2in.port;
2031                   udp0->checksum = 0;
2032                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
2033                     {
2034                       udp0->dst_port = s0->ext_host_port;
2035                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
2036                     }
2037                 }
2038             }
2039
2040           /* Hairpinning */
2041           nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port,
2042                                    s0->ext_host_port, proto0, 1);
2043
2044           /* Accounting */
2045           nat44_session_update_counters (s0, now,
2046                                          vlib_buffer_length_in_chain (vm,
2047                                                                       b0));
2048           /* Per-user LRU list maintenance */
2049           nat44_session_update_lru (sm, s0, thread_index);
2050
2051         trace0:
2052           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
2053                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
2054             {
2055               nat44_reass_trace_t *t =
2056                 vlib_add_trace (vm, node, b0, sizeof (*t));
2057               t->cached = cached0;
2058               t->sw_if_index = sw_if_index0;
2059               t->next_index = next0;
2060             }
2061
2062           if (cached0)
2063             {
2064               n_left_to_next++;
2065               to_next--;
2066               cached_fragments++;
2067             }
2068           else
2069             {
2070               pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP;
2071
2072               /* verify speculative enqueue, maybe switch current next frame */
2073               vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2074                                                to_next, n_left_to_next,
2075                                                bi0, next0);
2076             }
2077
2078           if (n_left_from == 0 && vec_len (fragments_to_loopback))
2079             {
2080               from = vlib_frame_vector_args (frame);
2081               u32 len = vec_len (fragments_to_loopback);
2082               if (len <= VLIB_FRAME_SIZE)
2083                 {
2084                   clib_memcpy_fast (from, fragments_to_loopback,
2085                                     sizeof (u32) * len);
2086                   n_left_from = len;
2087                   vec_reset_length (fragments_to_loopback);
2088                 }
2089               else
2090                 {
2091                   clib_memcpy_fast (from, fragments_to_loopback +
2092                                     (len - VLIB_FRAME_SIZE),
2093                                     sizeof (u32) * VLIB_FRAME_SIZE);
2094                   n_left_from = VLIB_FRAME_SIZE;
2095                   _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
2096                 }
2097             }
2098         }
2099
2100       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2101     }
2102
2103   vlib_node_increment_counter (vm, nat44_ed_in2out_reass_node.index,
2104                                NAT_IN2OUT_ED_ERROR_PROCESSED_FRAGMENTS,
2105                                pkts_processed);
2106   vlib_node_increment_counter (vm, nat44_ed_in2out_reass_node.index,
2107                                NAT_IN2OUT_ED_ERROR_CACHED_FRAGMENTS,
2108                                cached_fragments);
2109
2110   nat_send_all_to_node (vm, fragments_to_drop, node,
2111                         &node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT],
2112                         NAT_IN2OUT_ED_NEXT_DROP);
2113
2114   vec_free (fragments_to_drop);
2115   vec_free (fragments_to_loopback);
2116   return frame->n_vectors;
2117 }
2118
2119 static uword
2120 nat44_ed_in2out_reass_node_fn (vlib_main_t * vm,
2121                                vlib_node_runtime_t * node,
2122                                vlib_frame_t * frame)
2123 {
2124   return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 0);
2125 }
2126
2127 /* *INDENT-OFF* */
2128 VLIB_REGISTER_NODE (nat44_ed_in2out_reass_node) = {
2129   .function = nat44_ed_in2out_reass_node_fn,
2130   .name = "nat44-ed-in2out-reass",
2131   .vector_size = sizeof (u32),
2132   .format_trace = format_nat44_reass_trace,
2133   .type = VLIB_NODE_TYPE_INTERNAL,
2134   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2135   .error_strings = nat_in2out_ed_error_strings,
2136   .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
2137   .next_nodes = {
2138     [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
2139     [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
2140     [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
2141     [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2142     [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
2143   },
2144 };
2145 /* *INDENT-ON* */
2146
2147 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_node,
2148                               nat44_ed_in2out_reass_node_fn);
2149
2150 static uword
2151 nat44_ed_in2out_reass_output_node_fn (vlib_main_t * vm,
2152                                       vlib_node_runtime_t * node,
2153                                       vlib_frame_t * frame)
2154 {
2155   return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 1);
2156 }
2157
2158 /* *INDENT-OFF* */
2159 VLIB_REGISTER_NODE (nat44_ed_in2out_reass_output_node) = {
2160   .function = nat44_ed_in2out_reass_output_node_fn,
2161   .name = "nat44-ed-in2out-reass-output",
2162   .vector_size = sizeof (u32),
2163   .format_trace = format_nat44_reass_trace,
2164   .type = VLIB_NODE_TYPE_INTERNAL,
2165   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2166   .error_strings = nat_in2out_ed_error_strings,
2167   .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
2168   .next_nodes = {
2169     [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
2170     [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
2171     [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
2172     [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2173     [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
2174   },
2175 };
2176 /* *INDENT-ON* */
2177
2178 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_output_node,
2179                               nat44_ed_in2out_reass_output_node_fn);
2180
2181 /*
2182  * fd.io coding-style-patch-verification: ON
2183  *
2184  * Local Variables:
2185  * eval: (c-set-style "gnu")
2186  * End:
2187  */