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