src/plugins/nat/in2out_ed.c

   1 /*
   2  * Copyright (c) 2018 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 /**
  16  * @file
  17  * @brief NAT44 endpoint-dependent inside to outside network translation
  18  */
  19
  20 #include <vlib/vlib.h>
  21 #include <vnet/vnet.h>
  22 #include <vnet/pg/pg.h>
  23 #include <vnet/ip/ip.h>
  24 #include <vnet/ethernet/ethernet.h>
  25 #include <vnet/fib/ip4_fib.h>
  26 #include <vnet/udp/udp.h>
  27 #include <vppinfra/error.h>
  28 #include <nat/nat.h>
  29 #include <nat/nat_ipfix_logging.h>
  30 #include <nat/nat_inlines.h>
  31 #include <nat/nat44/inlines.h>
  32 #include <nat/nat_syslog.h>
  33 #include <nat/nat_ha.h>
  34 #include <nat/nat44/ed_inlines.h>
  35
  36 static char *nat_in2out_ed_error_strings[] = {
  37 #define _(sym,string) string,
  38   foreach_nat_in2out_ed_error
  39 #undef _
  40 };
  41
  42 typedef struct
  43 {
  44   u32 sw_if_index;
  45   u32 next_index;
  46   u32 session_index;
  47   u32 is_slow_path;
  48 } nat_in2out_ed_trace_t;
  49
  50 static u8 *
  51 format_nat_in2out_ed_trace (u8 * s, va_list * args)
  52 {
  53   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  54   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  55   nat_in2out_ed_trace_t *t = va_arg (*args, nat_in2out_ed_trace_t *);
  56   char *tag;
  57
  58   tag =
  59     t->is_slow_path ? "NAT44_IN2OUT_ED_SLOW_PATH" :
  60     "NAT44_IN2OUT_ED_FAST_PATH";
  61
  62   s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
  63               t->sw_if_index, t->next_index, t->session_index);
  64
  65   return s;
  66 }
  67
  68 #ifndef CLIB_MARCH_VARIANT
  69 int
  70 nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
  71 {
  72   snat_main_t *sm = &snat_main;
  73   nat44_is_idle_session_ctx_t *ctx = arg;
  74   snat_session_t *s;
  75   u64 sess_timeout_time;
  76   u8 proto;
  77   u16 r_port, l_port;
  78   ip4_address_t *l_addr, *r_addr;
  79   u32 fib_index;
  80   clib_bihash_kv_16_8_t ed_kv;
  81   int i;
  82   snat_address_t *a;
  83   snat_session_key_t key;
  84   snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
  85                                                        ctx->thread_index);
  86
  87   ASSERT (ctx->thread_index == ed_value_get_thread_index (kv));
  88   s = pool_elt_at_index (tsm->sessions, ed_value_get_session_index (kv));
  89   sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
  90   if (ctx->now >= sess_timeout_time)
  91     {
  92       if (is_fwd_bypass_session (s))
  93         goto delete;
  94
  95       l_addr = &s->out2in.addr;
  96       r_addr = &s->ext_host_addr;
  97       fib_index = s->out2in.fib_index;
  98       if (snat_is_unk_proto_session (s))
  99         {
 100           proto = s->in2out.port;
 101           r_port = 0;
 102           l_port = 0;
 103         }
 104       else
 105         {
 106           proto = nat_proto_to_ip_proto (s->in2out.protocol);
 107           l_port = s->out2in.port;
 108           r_port = s->ext_host_port;
 109         }
 110       make_ed_kv (l_addr, r_addr, proto, fib_index, l_port, r_port, ~0, ~0,
 111                   &ed_kv);
 112       if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &ed_kv, 0))
 113         nat_elog_warn ("out2in_ed key del failed");
 114
 115       if (snat_is_unk_proto_session (s))
 116         goto delete;
 117
 118       snat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
 119                                            s->in2out.addr.as_u32,
 120                                            s->out2in.addr.as_u32,
 121                                            s->in2out.protocol,
 122                                            s->in2out.port,
 123                                            s->out2in.port,
 124                                            s->in2out.fib_index);
 125
 126       nat_syslog_nat44_sdel (s->user_index, s->in2out.fib_index,
 127                              &s->in2out.addr, s->in2out.port,
 128                              &s->ext_host_nat_addr, s->ext_host_nat_port,
 129                              &s->out2in.addr, s->out2in.port,
 130                              &s->ext_host_addr, s->ext_host_port,
 131                              s->in2out.protocol, is_twice_nat_session (s));
 132
 133       nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
 134                    s->ext_host_port, s->out2in.protocol, s->out2in.fib_index,
 135                    ctx->thread_index);
 136
 137       if (is_twice_nat_session (s))
 138         {
 139           for (i = 0; i < vec_len (sm->twice_nat_addresses); i++)
 140             {
 141               key.protocol = s->in2out.protocol;
 142               key.port = s->ext_host_nat_port;
 143               a = sm->twice_nat_addresses + i;
 144               if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
 145                 {
 146                   snat_free_outside_address_and_port (sm->twice_nat_addresses,
 147                                                       ctx->thread_index,
 148                                                       &key);
 149                   break;
 150                 }
 151             }
 152         }
 153
 154       if (snat_is_session_static (s))
 155         goto delete;
 156
 157       snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
 158                                           &s->out2in);
 159     delete:
 160       nat_ed_session_delete (sm, s, ctx->thread_index, 1);
 161       return 1;
 162     }
 163
 164   return 0;
 165 }
 166 #endif
 167
 168 static inline u32
 169 icmp_in2out_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
 170                           ip4_header_t * ip0, icmp46_header_t * icmp0,
 171                           u32 sw_if_index0, u32 rx_fib_index0,
 172                           vlib_node_runtime_t * node, u32 next0, f64 now,
 173                           u32 thread_index, snat_session_t ** p_s0)
 174 {
 175   vlib_main_t *vm = vlib_get_main ();
 176
 177   next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
 178                        next0, thread_index, p_s0, 0);
 179   snat_session_t *s0 = *p_s0;
 180   if (PREDICT_TRUE (next0 != NAT_NEXT_DROP && s0))
 181     {
 182       /* Accounting */
 183       nat44_session_update_counters (s0, now,
 184                                      vlib_buffer_length_in_chain
 185                                      (vm, b0), thread_index);
 186       /* Per-user LRU list maintenance */
 187       nat44_session_update_lru (sm, s0, thread_index);
 188     }
 189   return next0;
 190 }
 191
 192 static_always_inline u16
 193 snat_random_port (u16 min, u16 max)
 194 {
 195   snat_main_t *sm = &snat_main;
 196   return min + random_u32 (&sm->random_seed) /
 197     (random_u32_max () / (max - min + 1) + 1);
 198 }
 199
 200 static int
 201 nat_ed_alloc_addr_and_port (snat_main_t * sm, u32 rx_fib_index,
 202                             u32 nat_proto, u32 thread_index,
 203                             ip4_address_t r_addr, u16 r_port, u8 proto,
 204                             u16 port_per_thread, u32 snat_thread_index,
 205                             snat_session_t * s,
 206                             ip4_address_t * allocated_addr,
 207                             u16 * allocated_port,
 208                             clib_bihash_kv_16_8_t * out2in_ed_kv)
 209 {
 210   int i;
 211   snat_address_t *a, *ga = 0;
 212   u32 portnum;
 213   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 214
 215   const u16 port_thread_offset = (port_per_thread * snat_thread_index) + 1024;
 216
 217   for (i = 0; i < vec_len (sm->addresses); i++)
 218     {
 219       a = sm->addresses + i;
 220       switch (nat_proto)
 221         {
 222 #define _(N, j, n, unused)                                                    \
 223   case NAT_PROTOCOL_##N:                                                     \
 224     if (a->fib_index == rx_fib_index)                                         \
 225       {                                                                       \
 226         u16 port = snat_random_port (1, port_per_thread);                     \
 227         u16 attempts = port_per_thread;                                       \
 228         while (attempts > 0)                                                  \
 229           {                                                                   \
 230             --attempts;                                                       \
 231             portnum = port_thread_offset + port;                              \
 232             make_ed_kv (&a->addr, &r_addr, proto, s->out2in.fib_index,        \
 233                         clib_host_to_net_u16 (portnum), r_port, thread_index, \
 234                         s - tsm->sessions, out2in_ed_kv);                     \
 235             int rv = clib_bihash_add_del_16_8 (&sm->out2in_ed, out2in_ed_kv,  \
 236                                                2 /* is_add */);               \
 237             if (0 == rv)                                                      \
 238               {                                                               \
 239                 ++a->busy_##n##_port_refcounts[portnum];                      \
 240                 a->busy_##n##_ports_per_thread[thread_index]++;               \
 241                 a->busy_##n##_ports++;                                        \
 242                 *allocated_addr = a->addr;                                    \
 243                 *allocated_port = clib_host_to_net_u16 (portnum);             \
 244                 return 0;                                                     \
 245               }                                                               \
 246             port = (port + 1) % port_per_thread;                              \
 247           }                                                                   \
 248       }                                                                       \
 249     else if (a->fib_index == ~0)                                              \
 250       {                                                                       \
 251         ga = a;                                                               \
 252       }                                                                       \
 253     break;
 254
 255           foreach_nat_protocol;
 256         default:
 257           nat_elog_info ("unknown protocol");
 258           return 1;
 259         }
 260     }
 261
 262   if (ga)
 263     {
 264       /* fake fib_index to reuse macro */
 265       rx_fib_index = ~0;
 266       a = ga;
 267       switch (nat_proto)
 268         {
 269           foreach_nat_protocol;
 270         default:
 271           nat_elog_info ("unknown protocol");
 272           return 1;
 273         }
 274     }
 275
 276 #undef _
 277
 278   /* Totally out of translations to use... */
 279   snat_ipfix_logging_addresses_exhausted (thread_index, 0);
 280   return 1;
 281 }
 282
 283 static_always_inline u32
 284 nat_outside_fib_index_lookup (snat_main_t * sm, ip4_address_t addr)
 285 {
 286   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
 287   nat_outside_fib_t *outside_fib;
 288   fib_prefix_t pfx = {
 289     .fp_proto = FIB_PROTOCOL_IP4,
 290     .fp_len = 32,
 291     .fp_addr = {.ip4.as_u32 = addr.as_u32,}
 292     ,
 293   };
 294   // TODO: multiple vrfs none can resolve addr
 295   /* *INDENT-OFF* */
 296   vec_foreach (outside_fib, sm->outside_fibs)
 297     {
 298       fei = fib_table_lookup (outside_fib->fib_index, &pfx);
 299       if (FIB_NODE_INDEX_INVALID != fei)
 300         {
 301           if (fib_entry_get_resolving_interface (fei) != ~0)
 302             {
 303               return outside_fib->fib_index;
 304             }
 305         }
 306     }
 307   /* *INDENT-ON* */
 308   return ~0;
 309 }
 310
 311 static u32
 312 slow_path_ed (snat_main_t * sm,
 313               vlib_buffer_t * b,
 314               ip4_address_t l_addr,
 315               ip4_address_t r_addr,
 316               u16 l_port,
 317               u16 r_port,
 318               u8 proto,
 319               u32 rx_fib_index,
 320               snat_session_t ** sessionp,
 321               vlib_node_runtime_t * node, u32 next, u32 thread_index, f64 now)
 322 {
 323
 324   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 325   clib_bihash_kv_16_8_t out2in_ed_kv;
 326   nat44_is_idle_session_ctx_t ctx;
 327   snat_session_key_t key0, key1;
 328   ip4_address_t allocated_addr;
 329   u16 allocated_port;
 330   u32 tx_fib_index;
 331   u8 identity_nat;
 332
 333   u32 nat_proto = ip_proto_to_nat_proto (proto);
 334   snat_session_t *s = NULL;
 335   lb_nat_type_t lb = 0;
 336
 337   if (PREDICT_TRUE (nat_proto == NAT_PROTOCOL_TCP))
 338     {
 339       if (PREDICT_FALSE
 340           (!tcp_flags_is_init
 341            (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)))
 342         {
 343           b->error = node->errors[NAT_IN2OUT_ED_ERROR_NON_SYN];
 344           return NAT_NEXT_DROP;
 345         }
 346     }
 347
 348   if (PREDICT_FALSE
 349       (nat44_ed_maximum_sessions_exceeded (sm, rx_fib_index, thread_index)))
 350     {
 351       if (!nat_lru_free_one (sm, thread_index, now))
 352         {
 353           b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
 354           nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
 355           nat_elog_notice ("maximum sessions exceeded");
 356           return NAT_NEXT_DROP;
 357         }
 358     }
 359
 360   key0.addr = l_addr;
 361   key0.port = l_port;
 362   key1.protocol = key0.protocol = nat_proto;
 363   key0.fib_index = rx_fib_index;
 364   key1.fib_index = sm->outside_fib_index;
 365   tx_fib_index = sm->outside_fib_index;
 366
 367   /* First try to match static mapping by local address and port */
 368   if (snat_static_mapping_match
 369       (sm, key0, &key1, 0, 0, 0, &lb, 0, &identity_nat))
 370     {
 371       s = nat_ed_session_alloc (sm, thread_index, now, proto);
 372       if (!s)
 373         {
 374           nat_elog_warn ("create NAT session failed");
 375           b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_USER_SESS_EXCEEDED];
 376           return NAT_NEXT_DROP;
 377         }
 378       switch (vec_len (sm->outside_fibs))
 379         {
 380         case 0:
 381           tx_fib_index = sm->outside_fib_index;
 382           break;
 383         case 1:
 384           tx_fib_index = sm->outside_fibs[0].fib_index;
 385           break;
 386         default:
 387           tx_fib_index = nat_outside_fib_index_lookup (sm, r_addr);
 388           break;
 389         }
 390
 391       s->out2in.fib_index = tx_fib_index;
 392       /* Try to create dynamic translation */
 393       if (nat_ed_alloc_addr_and_port (sm, rx_fib_index, nat_proto,
 394                                       thread_index, r_addr, r_port, proto,
 395                                       sm->port_per_thread,
 396                                       tsm->snat_thread_index, s,
 397                                       &allocated_addr,
 398                                       &allocated_port, &out2in_ed_kv))
 399         {
 400           nat_elog_notice ("addresses exhausted");
 401           b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS];
 402           nat_ed_session_delete (sm, s, thread_index, 1);
 403           return NAT_NEXT_DROP;
 404         }
 405       key1.addr = allocated_addr;
 406       key1.port = allocated_port;
 407     }
 408   else
 409     {
 410       if (PREDICT_FALSE (identity_nat))
 411         {
 412           *sessionp = s;
 413           return next;
 414         }
 415       s = nat_ed_session_alloc (sm, thread_index, now, proto);
 416       if (!s)
 417         {
 418           nat_elog_warn ("create NAT session failed");
 419           b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_USER_SESS_EXCEEDED];
 420           return NAT_NEXT_DROP;
 421         }
 422       switch (vec_len (sm->outside_fibs))
 423         {
 424         case 0:
 425           tx_fib_index = sm->outside_fib_index;
 426           break;
 427         case 1:
 428           tx_fib_index = sm->outside_fibs[0].fib_index;
 429           break;
 430         default:
 431           tx_fib_index = nat_outside_fib_index_lookup (sm, r_addr);
 432           break;
 433         }
 434
 435       s->out2in.fib_index = tx_fib_index;
 436       s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
 437
 438       make_ed_kv (&key1.addr, &r_addr, proto,
 439                   s->out2in.fib_index, key1.port, r_port, thread_index,
 440                   s - tsm->sessions, &out2in_ed_kv);
 441       if (clib_bihash_add_or_overwrite_stale_16_8
 442           (&sm->out2in_ed, &out2in_ed_kv, nat44_o2i_ed_is_idle_session_cb,
 443            &ctx))
 444         nat_elog_notice ("out2in-ed key add failed");
 445     }
 446
 447   if (lb)
 448     s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
 449   s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
 450   s->ext_host_addr = r_addr;
 451   s->ext_host_port = r_port;
 452   s->in2out = key0;
 453   s->out2in = key1;
 454   s->out2in.fib_index = tx_fib_index;
 455   s->out2in.protocol = key0.protocol;
 456
 457   clib_bihash_kv_16_8_t in2out_ed_kv;
 458   make_ed_kv (&l_addr, &r_addr, proto, rx_fib_index, l_port, r_port,
 459               thread_index, s - tsm->sessions, &in2out_ed_kv);
 460   ctx.now = now;
 461   ctx.thread_index = thread_index;
 462   if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, &in2out_ed_kv,
 463                                                nat44_i2o_ed_is_idle_session_cb,
 464                                                &ctx))
 465     nat_elog_notice ("in2out-ed key add failed");
 466
 467   *sessionp = s;
 468
 469   /* log NAT event */
 470   snat_ipfix_logging_nat44_ses_create (thread_index,
 471                                        s->in2out.addr.as_u32,
 472                                        s->out2in.addr.as_u32,
 473                                        s->in2out.protocol,
 474                                        s->in2out.port,
 475                                        s->out2in.port, s->in2out.fib_index);
 476
 477   nat_syslog_nat44_sadd (s->user_index, s->in2out.fib_index,
 478                          &s->in2out.addr, s->in2out.port,
 479                          &s->ext_host_nat_addr, s->ext_host_nat_port,
 480                          &s->out2in.addr, s->out2in.port,
 481                          &s->ext_host_addr, s->ext_host_port,
 482                          s->in2out.protocol, 0);
 483
 484   nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
 485                s->out2in.port, &s->ext_host_addr, s->ext_host_port,
 486                &s->ext_host_nat_addr, s->ext_host_nat_port,
 487                s->in2out.protocol, s->in2out.fib_index, s->flags,
 488                thread_index, 0);
 489
 490   return next;
 491 }
 492
 493 static_always_inline int
 494 nat44_ed_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
 495                         u32 sw_if_index, ip4_header_t * ip, u32 proto,
 496                         u32 rx_fib_index, u32 thread_index)
 497 {
 498   udp_header_t *udp = ip4_next_header (ip);
 499   clib_bihash_kv_16_8_t kv, value;
 500   snat_session_key_t key0, key1;
 501
 502   make_ed_kv (&ip->dst_address, &ip->src_address, ip->protocol,
 503               sm->outside_fib_index, udp->dst_port, udp->src_port, ~0, ~0,
 504               &kv);
 505
 506   /* NAT packet aimed at external address if has active sessions */
 507   if (clib_bihash_search_16_8 (&sm->out2in_ed, &kv, &value))
 508     {
 509       key0.addr = ip->dst_address;
 510       key0.port = udp->dst_port;
 511       key0.protocol = proto;
 512       key0.fib_index = sm->outside_fib_index;
 513       /* or is static mappings */
 514       if (!snat_static_mapping_match (sm, key0, &key1, 1, 0, 0, 0, 0, 0))
 515         return 0;
 516     }
 517   else
 518     return 0;
 519
 520   if (sm->forwarding_enabled)
 521     return 1;
 522
 523   return snat_not_translate_fast (sm, node, sw_if_index, ip, proto,
 524                                   rx_fib_index);
 525 }
 526
 527 static_always_inline int
 528 nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip,
 529                                       u32 thread_index, f64 now,
 530                                       vlib_main_t * vm, vlib_buffer_t * b)
 531 {
 532   clib_bihash_kv_16_8_t kv, value;
 533   snat_session_t *s = 0;
 534   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 535
 536   if (!sm->forwarding_enabled)
 537     return 0;
 538
 539   if (ip->protocol == IP_PROTOCOL_ICMP)
 540     {
 541       if (get_icmp_i2o_ed_key (b, ip, 0, ~0, ~0, 0, 0, 0, &kv))
 542         return 0;
 543     }
 544   else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
 545     {
 546       make_ed_kv (&ip->src_address, &ip->dst_address, ip->protocol, 0,
 547                   vnet_buffer (b)->ip.reass.l4_src_port,
 548                   vnet_buffer (b)->ip.reass.l4_dst_port, ~0, ~0, &kv);
 549     }
 550   else
 551     {
 552       make_ed_kv (&ip->src_address, &ip->dst_address, ip->protocol, 0, 0,
 553                   0, ~0, ~0, &kv);
 554     }
 555
 556   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 557     {
 558       ASSERT (thread_index == ed_value_get_thread_index (&value));
 559       s =
 560         pool_elt_at_index (tsm->sessions,
 561                            ed_value_get_session_index (&value));
 562       if (is_fwd_bypass_session (s))
 563         {
 564           if (ip->protocol == IP_PROTOCOL_TCP)
 565             {
 566               if (nat44_set_tcp_session_state_i2o
 567                   (sm, now, s, b, thread_index))
 568                 return 1;
 569             }
 570           /* Accounting */
 571           nat44_session_update_counters (s, now,
 572                                          vlib_buffer_length_in_chain (vm, b),
 573                                          thread_index);
 574           /* Per-user LRU list maintenance */
 575           nat44_session_update_lru (sm, s, thread_index);
 576           return 1;
 577         }
 578       else
 579         return 0;
 580     }
 581
 582   return 0;
 583 }
 584
 585 static_always_inline int
 586 nat44_ed_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip,
 587                                        u16 src_port, u16 dst_port,
 588                                        u32 thread_index, u32 rx_sw_if_index,
 589                                        u32 tx_sw_if_index)
 590 {
 591   clib_bihash_kv_16_8_t kv, value;
 592   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 593   snat_interface_t *i;
 594   snat_session_t *s;
 595   u32 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (rx_sw_if_index);
 596   u32 tx_fib_index = ip4_fib_table_get_index_for_sw_if_index (tx_sw_if_index);
 597
 598   /* src NAT check */
 599   make_ed_kv (&ip->src_address, &ip->dst_address, ip->protocol,
 600               tx_fib_index, src_port, dst_port, ~0, ~0, &kv);
 601   if (!clib_bihash_search_16_8 (&sm->out2in_ed, &kv, &value))
 602     {
 603       ASSERT (thread_index == ed_value_get_thread_index (&value));
 604       s =
 605         pool_elt_at_index (tsm->sessions,
 606                            ed_value_get_session_index (&value));
 607       if (nat44_is_ses_closed (s))
 608         {
 609           nat_free_session_data (sm, s, thread_index, 0);
 610           nat_ed_session_delete (sm, s, thread_index, 1);
 611         }
 612       else
 613         s->flags |= SNAT_SESSION_FLAG_OUTPUT_FEATURE;
 614       return 1;
 615     }
 616
 617   /* dst NAT check */
 618   make_ed_kv (&ip->dst_address, &ip->src_address, ip->protocol,
 619               rx_fib_index, dst_port, src_port, ~0, ~0, &kv);
 620   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 621     {
 622       ASSERT (thread_index == ed_value_get_thread_index (&value));
 623       s =
 624         pool_elt_at_index (tsm->sessions,
 625                            ed_value_get_session_index (&value));
 626       if (is_fwd_bypass_session (s))
 627         return 0;
 628
 629       /* hairpinning */
 630       /* *INDENT-OFF* */
 631       pool_foreach (i, sm->output_feature_interfaces,
 632       ({
 633         if ((nat_interface_is_inside (i)) && (rx_sw_if_index == i->sw_if_index))
 634            return 0;
 635       }));
 636       /* *INDENT-ON* */
 637       return 1;
 638     }
 639
 640   return 0;
 641 }
 642
 643 #ifndef CLIB_MARCH_VARIANT
 644 u32
 645 icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node,
 646                       u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip,
 647                       u8 * p_proto, snat_session_key_t * p_value,
 648                       u8 * p_dont_translate, void *d, void *e)
 649 {
 650   u32 sw_if_index;
 651   u32 rx_fib_index;
 652   snat_session_t *s = 0;
 653   u8 dont_translate = 0;
 654   clib_bihash_kv_16_8_t kv, value;
 655   u32 next = ~0;
 656   int err;
 657   u16 l_port = 0, r_port = 0;   // initialize to workaround gcc warning
 658   vlib_main_t *vm = vlib_get_main ();
 659   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 660
 661   sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
 662   rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
 663
 664   err =
 665     get_icmp_i2o_ed_key (b, ip, rx_fib_index, ~0, ~0, p_proto, &l_port,
 666                          &r_port, &kv);
 667   if (err != 0)
 668     {
 669       b->error = node->errors[err];
 670       next = NAT_NEXT_DROP;
 671       goto out;
 672     }
 673
 674   if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
 675     {
 676       if (vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0)
 677         {
 678           if (PREDICT_FALSE
 679               (nat44_ed_not_translate_output_feature
 680                (sm, ip, l_port, r_port, thread_index,
 681                 sw_if_index, vnet_buffer (b)->sw_if_index[VLIB_TX])))
 682             {
 683               dont_translate = 1;
 684               goto out;
 685             }
 686         }
 687       else
 688         {
 689           if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index,
 690                                                      ip, NAT_PROTOCOL_ICMP,
 691                                                      rx_fib_index,
 692                                                      thread_index)))
 693             {
 694               dont_translate = 1;
 695               goto out;
 696             }
 697         }
 698
 699       if (PREDICT_FALSE
 700           (icmp_type_is_error_message
 701            (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)))
 702         {
 703           b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
 704           next = NAT_NEXT_DROP;
 705           goto out;
 706         }
 707
 708       next =
 709         slow_path_ed (sm, b, ip->src_address, ip->dst_address, l_port, r_port,
 710                       ip->protocol, rx_fib_index, &s, node, next,
 711                       thread_index, vlib_time_now (vm));
 712
 713       if (PREDICT_FALSE (next == NAT_NEXT_DROP))
 714         goto out;
 715
 716       if (!s)
 717         {
 718           dont_translate = 1;
 719           goto out;
 720         }
 721     }
 722   else
 723     {
 724       if (PREDICT_FALSE
 725           (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
 726            ICMP4_echo_request
 727            && vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
 728            ICMP4_echo_reply
 729            && !icmp_type_is_error_message (vnet_buffer (b)->ip.
 730                                            reass.icmp_type_or_tcp_flags)))
 731         {
 732           b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
 733           next = NAT_NEXT_DROP;
 734           goto out;
 735         }
 736
 737       ASSERT (thread_index == ed_value_get_thread_index (&value));
 738       s =
 739         pool_elt_at_index (tsm->sessions,
 740                            ed_value_get_session_index (&value));
 741     }
 742 out:
 743   if (s)
 744     *p_value = s->out2in;
 745   *p_dont_translate = dont_translate;
 746   if (d)
 747     *(snat_session_t **) d = s;
 748   return next;
 749 }
 750 #endif
 751
 752 static snat_session_t *
 753 nat44_ed_in2out_unknown_proto (snat_main_t * sm,
 754                                vlib_buffer_t * b,
 755                                ip4_header_t * ip,
 756                                u32 rx_fib_index,
 757                                u32 thread_index,
 758                                f64 now,
 759                                vlib_main_t * vm, vlib_node_runtime_t * node)
 760 {
 761   clib_bihash_kv_8_8_t kv, value;
 762   clib_bihash_kv_16_8_t s_kv, s_value;
 763   snat_static_mapping_t *m;
 764   u32 old_addr, new_addr = 0;
 765   ip_csum_t sum;
 766   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 767   snat_session_t *s;
 768   u32 outside_fib_index = sm->outside_fib_index;
 769   int i;
 770   u8 is_sm = 0;
 771
 772   switch (vec_len (sm->outside_fibs))
 773     {
 774     case 0:
 775       outside_fib_index = sm->outside_fib_index;
 776       break;
 777     case 1:
 778       outside_fib_index = sm->outside_fibs[0].fib_index;
 779       break;
 780     default:
 781       outside_fib_index = nat_outside_fib_index_lookup (sm, ip->dst_address);
 782       break;
 783     }
 784   old_addr = ip->src_address.as_u32;
 785
 786   make_ed_kv (&ip->src_address, &ip->dst_address, ip->protocol,
 787               rx_fib_index, 0, 0, ~0, ~0, &s_kv);
 788
 789   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &s_kv, &s_value))
 790     {
 791       ASSERT (thread_index == ed_value_get_thread_index (&s_value));
 792       s =
 793         pool_elt_at_index (tsm->sessions,
 794                            ed_value_get_session_index (&s_value));
 795       new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
 796     }
 797   else
 798     {
 799       if (PREDICT_FALSE
 800           (nat44_ed_maximum_sessions_exceeded
 801            (sm, rx_fib_index, thread_index)))
 802         {
 803           b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
 804           nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
 805           nat_elog_notice ("maximum sessions exceeded");
 806           return 0;
 807         }
 808
 809       make_sm_kv (&kv, &ip->src_address, 0, rx_fib_index, 0);
 810
 811       /* Try to find static mapping first */
 812       if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
 813         {
 814           m = pool_elt_at_index (sm->static_mappings, value.value);
 815           new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
 816           is_sm = 1;
 817           goto create_ses;
 818         }
 819       else
 820         {
 821           /* *INDENT-OFF* */
 822           pool_foreach (s, tsm->sessions, {
 823             if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
 824               {
 825                 new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
 826
 827                 make_ed_kv (&s->out2in.addr, &ip->dst_address, ip->protocol,
 828                             outside_fib_index, 0, 0, ~0, ~0, &s_kv);
 829                 if (clib_bihash_search_16_8 (&sm->out2in_ed, &s_kv, &s_value))
 830                   goto create_ses;
 831
 832                 break;
 833               }
 834           });
 835           /* *INDENT-ON* */
 836
 837           for (i = 0; i < vec_len (sm->addresses); i++)
 838             {
 839               make_ed_kv (&sm->addresses[i].addr, &ip->dst_address,
 840                           ip->protocol, outside_fib_index, 0, 0, ~0, ~0,
 841                           &s_kv);
 842               if (clib_bihash_search_16_8 (&sm->out2in_ed, &s_kv, &s_value))
 843                 {
 844                   new_addr = ip->src_address.as_u32 =
 845                     sm->addresses[i].addr.as_u32;
 846                   goto create_ses;
 847                 }
 848             }
 849           return 0;
 850         }
 851
 852     create_ses:
 853       s = nat_ed_session_alloc (sm, thread_index, now, ip->protocol);
 854       if (!s)
 855         {
 856           b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_USER_SESS_EXCEEDED];
 857           nat_elog_warn ("create NAT session failed");
 858           return 0;
 859         }
 860
 861       s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
 862       s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
 863       s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
 864       s->out2in.addr.as_u32 = new_addr;
 865       s->out2in.fib_index = outside_fib_index;
 866       s->in2out.addr.as_u32 = old_addr;
 867       s->in2out.fib_index = rx_fib_index;
 868       s->in2out.port = s->out2in.port = ip->protocol;
 869       if (is_sm)
 870         s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
 871
 872       /* Add to lookup tables */
 873       make_ed_kv (&s->in2out.addr, &ip->dst_address, ip->protocol,
 874                   rx_fib_index, 0, 0, thread_index, s - tsm->sessions, &s_kv);
 875       if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1))
 876         nat_elog_notice ("in2out key add failed");
 877
 878       make_ed_kv (&s->out2in.addr, &ip->dst_address, ip->protocol,
 879                   outside_fib_index, 0, 0, thread_index, s - tsm->sessions,
 880                   &s_kv);
 881       if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &s_kv, 1))
 882         nat_elog_notice ("out2in key add failed");
 883     }
 884
 885   /* Update IP checksum */
 886   sum = ip->checksum;
 887   sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
 888   ip->checksum = ip_csum_fold (sum);
 889
 890   /* Accounting */
 891   nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b),
 892                                  thread_index);
 893   /* Per-user LRU list maintenance */
 894   nat44_session_update_lru (sm, s, thread_index);
 895
 896   /* Hairpinning */
 897   if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
 898     nat44_ed_hairpinning_unknown_proto (sm, b, ip);
 899
 900   if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
 901     vnet_buffer (b)->sw_if_index[VLIB_TX] = outside_fib_index;
 902
 903   return s;
 904 }
 905
 906 static inline uword
 907 nat44_ed_in2out_fast_path_node_fn_inline (vlib_main_t * vm,
 908                                           vlib_node_runtime_t * node,
 909                                           vlib_frame_t * frame,
 910                                           int is_output_feature)
 911 {
 912   u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
 913   nat_next_t next_index;
 914   snat_main_t *sm = &snat_main;
 915   f64 now = vlib_time_now (vm);
 916   u32 thread_index = vm->thread_index;
 917   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 918   u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
 919     0, def_slow;
 920
 921   def_slow = is_output_feature ? NAT_NEXT_IN2OUT_ED_OUTPUT_SLOW_PATH :
 922     NAT_NEXT_IN2OUT_ED_SLOW_PATH;
 923
 924   stats_node_index = sm->ed_in2out_node_index;
 925
 926   from = vlib_frame_vector_args (frame);
 927   n_left_from = frame->n_vectors;
 928   next_index = node->cached_next_index;
 929
 930   while (n_left_from > 0)
 931     {
 932       u32 n_left_to_next;
 933
 934       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 935
 936       while (n_left_from > 0 && n_left_to_next > 0)
 937         {
 938           u32 bi0;
 939           vlib_buffer_t *b0;
 940           u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
 941             new_addr0, old_addr0;
 942           u16 old_port0, new_port0;
 943           ip4_header_t *ip0;
 944           udp_header_t *udp0;
 945           tcp_header_t *tcp0;
 946           snat_session_t *s0 = 0;
 947           clib_bihash_kv_16_8_t kv0, value0;
 948           ip_csum_t sum0;
 949
 950           /* speculatively enqueue b0 to the current next frame */
 951           bi0 = from[0];
 952           to_next[0] = bi0;
 953           from += 1;
 954           to_next += 1;
 955           n_left_from -= 1;
 956           n_left_to_next -= 1;
 957
 958           b0 = vlib_get_buffer (vm, bi0);
 959
 960           if (is_output_feature)
 961             {
 962               vnet_feature_next (&vnet_buffer2 (b0)->nat.arc_next, b0);
 963               iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
 964             }
 965
 966           next0 = vnet_buffer2 (b0)->nat.arc_next;
 967
 968           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
 969                                   iph_offset0);
 970
 971           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 972           rx_fib_index0 =
 973             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
 974                                                  sw_if_index0);
 975
 976           if (PREDICT_FALSE (ip0->ttl == 1))
 977             {
 978               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 979               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
 980                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
 981                                            0);
 982               next0 = NAT_NEXT_ICMP_ERROR;
 983               goto trace0;
 984             }
 985
 986           udp0 = ip4_next_header (ip0);
 987           tcp0 = (tcp_header_t *) udp0;
 988           proto0 = ip_proto_to_nat_proto (ip0->protocol);
 989
 990           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
 991             {
 992               next0 = def_slow;
 993               goto trace0;
 994             }
 995
 996           if (is_output_feature)
 997             {
 998               if (PREDICT_FALSE (nat_not_translate_output_feature_fwd
 999                                  (sm, ip0, thread_index, now, vm, b0)))
1000                 goto trace0;
1001             }
1002
1003           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
1004             {
1005               next0 = def_slow;
1006               goto trace0;
1007             }
1008
1009           make_ed_kv (&ip0->src_address, &ip0->dst_address,
1010                       ip0->protocol, rx_fib_index0,
1011                       vnet_buffer (b0)->ip.reass.l4_src_port,
1012                       vnet_buffer (b0)->ip.reass.l4_dst_port, ~0, ~0, &kv0);
1013
1014           // lookup for session
1015           if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1016             {
1017               // session does not exist go slow path
1018               next0 = def_slow;
1019               goto trace0;
1020             }
1021           ASSERT (thread_index == ed_value_get_thread_index (&value0));
1022           s0 =
1023             pool_elt_at_index (tsm->sessions,
1024                                ed_value_get_session_index (&value0));
1025
1026           if (s0->tcp_closed_timestamp)
1027             {
1028               if (now >= s0->tcp_closed_timestamp)
1029                 {
1030                   // session is closed, go slow path
1031                   next0 = def_slow;
1032                 }
1033               else
1034                 {
1035                   // session in transitory timeout, drop
1036                   b0->error = node->errors[NAT_IN2OUT_ED_ERROR_TCP_CLOSED];
1037                   next0 = NAT_NEXT_DROP;
1038                 }
1039               goto trace0;
1040             }
1041
1042           // drop if session expired
1043           u64 sess_timeout_time;
1044           sess_timeout_time = s0->last_heard +
1045             (f64) nat44_session_get_timeout (sm, s0);
1046           if (now >= sess_timeout_time)
1047             {
1048               nat_free_session_data (sm, s0, thread_index, 0);
1049               nat_ed_session_delete (sm, s0, thread_index, 1);
1050               // session is closed, go slow path
1051               next0 = def_slow;
1052               goto trace0;
1053             }
1054
1055           b0->flags |= VNET_BUFFER_F_IS_NATED;
1056
1057           if (!is_output_feature)
1058             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1059
1060           old_addr0 = ip0->src_address.as_u32;
1061           new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1062           sum0 = ip0->checksum;
1063           sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1064                                  src_address);
1065           if (PREDICT_FALSE (is_twice_nat_session (s0)))
1066             sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1067                                    s0->ext_host_addr.as_u32, ip4_header_t,
1068                                    dst_address);
1069           ip0->checksum = ip_csum_fold (sum0);
1070
1071           old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1072
1073           if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
1074             {
1075               if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1076                 {
1077                   new_port0 = udp0->src_port = s0->out2in.port;
1078                   sum0 = tcp0->checksum;
1079                   sum0 =
1080                     ip_csum_update (sum0, old_addr0, new_addr0,
1081                                     ip4_header_t, dst_address);
1082                   sum0 =
1083                     ip_csum_update (sum0, old_port0, new_port0,
1084                                     ip4_header_t, length);
1085                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1086                     {
1087                       sum0 =
1088                         ip_csum_update (sum0, ip0->dst_address.as_u32,
1089                                         s0->ext_host_addr.as_u32,
1090                                         ip4_header_t, dst_address);
1091                       sum0 =
1092                         ip_csum_update (sum0,
1093                                         vnet_buffer (b0)->ip.
1094                                         reass.l4_dst_port, s0->ext_host_port,
1095                                         ip4_header_t, length);
1096                       tcp0->dst_port = s0->ext_host_port;
1097                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1098                     }
1099                   mss_clamping (sm, tcp0, &sum0);
1100                   tcp0->checksum = ip_csum_fold (sum0);
1101                 }
1102               tcp_packets++;
1103               if (nat44_set_tcp_session_state_i2o
1104                   (sm, now, s0, b0, thread_index))
1105                 goto trace0;
1106             }
1107           else if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment
1108                    && udp0->checksum)
1109             {
1110               new_port0 = udp0->src_port = s0->out2in.port;
1111               sum0 = udp0->checksum;
1112               sum0 =
1113                 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1114                                 dst_address);
1115               sum0 =
1116                 ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1117                                 length);
1118               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1119                 {
1120                   sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1121                                          s0->ext_host_addr.as_u32,
1122                                          ip4_header_t, dst_address);
1123                   sum0 =
1124                     ip_csum_update (sum0,
1125                                     vnet_buffer (b0)->ip.reass.l4_dst_port,
1126                                     s0->ext_host_port, ip4_header_t, length);
1127                   udp0->dst_port = s0->ext_host_port;
1128                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1129                 }
1130               udp0->checksum = ip_csum_fold (sum0);
1131               udp_packets++;
1132             }
1133           else
1134             {
1135               if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1136                 {
1137                   new_port0 = udp0->src_port = s0->out2in.port;
1138                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1139                     {
1140                       udp0->dst_port = s0->ext_host_port;
1141                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1142                     }
1143                   udp_packets++;
1144                 }
1145             }
1146
1147           /* Accounting */
1148           nat44_session_update_counters (s0, now,
1149                                          vlib_buffer_length_in_chain
1150                                          (vm, b0), thread_index);
1151           /* Per-user LRU list maintenance */
1152           nat44_session_update_lru (sm, s0, thread_index);
1153
1154         trace0:
1155           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1156                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1157             {
1158               nat_in2out_ed_trace_t *t =
1159                 vlib_add_trace (vm, node, b0, sizeof (*t));
1160               t->sw_if_index = sw_if_index0;
1161               t->next_index = next0;
1162               t->is_slow_path = 0;
1163
1164               if (s0)
1165                 t->session_index = s0 - tsm->sessions;
1166               else
1167                 t->session_index = ~0;
1168             }
1169
1170           pkts_processed += next0 == vnet_buffer2 (b0)->nat.arc_next;
1171           /* verify speculative enqueue, maybe switch current next frame */
1172           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1173                                            to_next, n_left_to_next,
1174                                            bi0, next0);
1175         }
1176
1177       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1178     }
1179
1180   vlib_node_increment_counter (vm, stats_node_index,
1181                                NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
1182                                pkts_processed);
1183   vlib_node_increment_counter (vm, stats_node_index,
1184                                NAT_IN2OUT_ED_ERROR_TCP_PACKETS, tcp_packets);
1185   vlib_node_increment_counter (vm, stats_node_index,
1186                                NAT_IN2OUT_ED_ERROR_UDP_PACKETS, udp_packets);
1187   vlib_node_increment_counter (vm, stats_node_index,
1188                                NAT_IN2OUT_ED_ERROR_ICMP_PACKETS,
1189                                icmp_packets);
1190   vlib_node_increment_counter (vm, stats_node_index,
1191                                NAT_IN2OUT_ED_ERROR_OTHER_PACKETS,
1192                                other_packets);
1193   return frame->n_vectors;
1194 }
1195
1196 static inline uword
1197 nat44_ed_in2out_slow_path_node_fn_inline (vlib_main_t * vm,
1198                                           vlib_node_runtime_t * node,
1199                                           vlib_frame_t * frame,
1200                                           int is_output_feature)
1201 {
1202   u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
1203   nat_next_t next_index;
1204   snat_main_t *sm = &snat_main;
1205   f64 now = vlib_time_now (vm);
1206   u32 thread_index = vm->thread_index;
1207   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
1208   u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets = 0;
1209
1210   stats_node_index = sm->ed_in2out_slowpath_node_index;
1211
1212   from = vlib_frame_vector_args (frame);
1213   n_left_from = frame->n_vectors;
1214   next_index = node->cached_next_index;
1215
1216   while (n_left_from > 0)
1217     {
1218       u32 n_left_to_next;
1219
1220       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1221
1222       while (n_left_from > 0 && n_left_to_next > 0)
1223         {
1224           u32 bi0;
1225           vlib_buffer_t *b0;
1226           u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
1227             new_addr0, old_addr0;
1228           u16 old_port0, new_port0;
1229           ip4_header_t *ip0;
1230           udp_header_t *udp0;
1231           tcp_header_t *tcp0;
1232           icmp46_header_t *icmp0;
1233           snat_session_t *s0 = 0;
1234           clib_bihash_kv_16_8_t kv0, value0;
1235           ip_csum_t sum0;
1236
1237           /* speculatively enqueue b0 to the current next frame */
1238           bi0 = from[0];
1239           to_next[0] = bi0;
1240           from += 1;
1241           to_next += 1;
1242           n_left_from -= 1;
1243           n_left_to_next -= 1;
1244
1245           b0 = vlib_get_buffer (vm, bi0);
1246
1247           if (is_output_feature)
1248             iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
1249
1250           next0 = vnet_buffer2 (b0)->nat.arc_next;
1251
1252           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1253                                   iph_offset0);
1254
1255           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1256           rx_fib_index0 =
1257             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1258                                                  sw_if_index0);
1259
1260           if (PREDICT_FALSE (ip0->ttl == 1))
1261             {
1262               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1263               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1264                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
1265                                            0);
1266               next0 = NAT_NEXT_ICMP_ERROR;
1267               goto trace0;
1268             }
1269
1270           udp0 = ip4_next_header (ip0);
1271           tcp0 = (tcp_header_t *) udp0;
1272           icmp0 = (icmp46_header_t *) udp0;
1273           proto0 = ip_proto_to_nat_proto (ip0->protocol);
1274
1275           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
1276             {
1277               s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
1278                                                   rx_fib_index0,
1279                                                   thread_index, now,
1280                                                   vm, node);
1281               if (!s0)
1282                 next0 = NAT_NEXT_DROP;
1283
1284               other_packets++;
1285               goto trace0;
1286             }
1287
1288           if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
1289             {
1290               next0 = icmp_in2out_ed_slow_path
1291                 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0,
1292                  node, next0, now, thread_index, &s0);
1293               icmp_packets++;
1294               goto trace0;
1295             }
1296
1297           // move down
1298           make_ed_kv (&ip0->src_address, &ip0->dst_address,
1299                       ip0->protocol, rx_fib_index0,
1300                       vnet_buffer (b0)->ip.reass.l4_src_port,
1301                       vnet_buffer (b0)->ip.reass.l4_dst_port, ~0, ~0, &kv0);
1302
1303           if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1304             {
1305               ASSERT (thread_index == ed_value_get_thread_index (&value0));
1306               s0 =
1307                 pool_elt_at_index (tsm->sessions,
1308                                    ed_value_get_session_index (&value0));
1309
1310               if (s0->tcp_closed_timestamp && now >= s0->tcp_closed_timestamp)
1311                 {
1312                   nat_free_session_data (sm, s0, thread_index, 0);
1313                   nat_ed_session_delete (sm, s0, thread_index, 1);
1314                   s0 = NULL;
1315                 }
1316             }
1317
1318           if (!s0)
1319             {
1320               if (is_output_feature)
1321                 {
1322                   if (PREDICT_FALSE
1323                       (nat44_ed_not_translate_output_feature
1324                        (sm, ip0, vnet_buffer (b0)->ip.reass.l4_src_port,
1325                         vnet_buffer (b0)->ip.reass.l4_dst_port, thread_index,
1326                         sw_if_index0,
1327                         vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1328                     goto trace0;
1329
1330                   /*
1331                    * Send DHCP packets to the ipv4 stack, or we won't
1332                    * be able to use dhcp client on the outside interface
1333                    */
1334                   if (PREDICT_FALSE
1335                       (proto0 == NAT_PROTOCOL_UDP
1336                        && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
1337                            clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_server))
1338                        && ip0->dst_address.as_u32 == 0xffffffff))
1339                     goto trace0;
1340                 }
1341               else
1342                 {
1343                   if (PREDICT_FALSE
1344                       (nat44_ed_not_translate
1345                        (sm, node, sw_if_index0, ip0, proto0, rx_fib_index0,
1346                         thread_index)))
1347                     goto trace0;
1348                 }
1349
1350               next0 =
1351                 slow_path_ed (sm, b0, ip0->src_address, ip0->dst_address,
1352                               vnet_buffer (b0)->ip.reass.l4_src_port,
1353                               vnet_buffer (b0)->ip.reass.l4_dst_port,
1354                               ip0->protocol, rx_fib_index0, &s0, node, next0,
1355                               thread_index, now);
1356
1357               if (PREDICT_FALSE (next0 == NAT_NEXT_DROP))
1358                 goto trace0;
1359
1360               if (PREDICT_FALSE (!s0))
1361                 goto trace0;
1362
1363             }
1364
1365           b0->flags |= VNET_BUFFER_F_IS_NATED;
1366
1367           if (!is_output_feature)
1368             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1369
1370           old_addr0 = ip0->src_address.as_u32;
1371           new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1372           sum0 = ip0->checksum;
1373           sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1374                                  src_address);
1375           if (PREDICT_FALSE (is_twice_nat_session (s0)))
1376             sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1377                                    s0->ext_host_addr.as_u32, ip4_header_t,
1378                                    dst_address);
1379           ip0->checksum = ip_csum_fold (sum0);
1380
1381           old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1382
1383           if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
1384             {
1385               if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1386                 {
1387                   new_port0 = udp0->src_port = s0->out2in.port;
1388                   sum0 = tcp0->checksum;
1389                   sum0 =
1390                     ip_csum_update (sum0, old_addr0, new_addr0,
1391                                     ip4_header_t, dst_address);
1392                   sum0 =
1393                     ip_csum_update (sum0, old_port0, new_port0,
1394                                     ip4_header_t, length);
1395                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1396                     {
1397                       sum0 =
1398                         ip_csum_update (sum0, ip0->dst_address.as_u32,
1399                                         s0->ext_host_addr.as_u32,
1400                                         ip4_header_t, dst_address);
1401                       sum0 =
1402                         ip_csum_update (sum0,
1403                                         vnet_buffer (b0)->ip.
1404                                         reass.l4_dst_port, s0->ext_host_port,
1405                                         ip4_header_t, length);
1406                       tcp0->dst_port = s0->ext_host_port;
1407                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1408                     }
1409                   mss_clamping (sm, tcp0, &sum0);
1410                   tcp0->checksum = ip_csum_fold (sum0);
1411                 }
1412               tcp_packets++;
1413               if (nat44_set_tcp_session_state_i2o
1414                   (sm, now, s0, b0, thread_index))
1415                 goto trace0;
1416             }
1417           else if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment
1418                    && udp0->checksum)
1419             {
1420               new_port0 = udp0->src_port = s0->out2in.port;
1421               sum0 = udp0->checksum;
1422               sum0 =
1423                 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1424                                 dst_address);
1425               sum0 =
1426                 ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1427                                 length);
1428               if (PREDICT_FALSE (is_twice_nat_session (s0)))
1429                 {
1430                   sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1431                                          s0->ext_host_addr.as_u32,
1432                                          ip4_header_t, dst_address);
1433                   sum0 =
1434                     ip_csum_update (sum0,
1435                                     vnet_buffer (b0)->ip.reass.l4_dst_port,
1436                                     s0->ext_host_port, ip4_header_t, length);
1437                   udp0->dst_port = s0->ext_host_port;
1438                   ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1439                 }
1440               udp0->checksum = ip_csum_fold (sum0);
1441               udp_packets++;
1442             }
1443           else
1444             {
1445               if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1446                 {
1447                   new_port0 = udp0->src_port = s0->out2in.port;
1448                   if (PREDICT_FALSE (is_twice_nat_session (s0)))
1449                     {
1450                       udp0->dst_port = s0->ext_host_port;
1451                       ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1452                     }
1453                   udp_packets++;
1454                 }
1455             }
1456
1457           /* Accounting */
1458           nat44_session_update_counters (s0, now,
1459                                          vlib_buffer_length_in_chain
1460                                          (vm, b0), thread_index);
1461           /* Per-user LRU list maintenance */
1462           nat44_session_update_lru (sm, s0, thread_index);
1463
1464         trace0:
1465           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1466                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1467             {
1468               nat_in2out_ed_trace_t *t =
1469                 vlib_add_trace (vm, node, b0, sizeof (*t));
1470               t->sw_if_index = sw_if_index0;
1471               t->next_index = next0;
1472               t->is_slow_path = 1;
1473
1474               if (s0)
1475                 t->session_index = s0 - tsm->sessions;
1476               else
1477                 t->session_index = ~0;
1478             }
1479
1480           pkts_processed += next0 == vnet_buffer2 (b0)->nat.arc_next;
1481
1482           /* verify speculative enqueue, maybe switch current next frame */
1483           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1484                                            to_next, n_left_to_next,
1485                                            bi0, next0);
1486         }
1487
1488       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1489     }
1490
1491   vlib_node_increment_counter (vm, stats_node_index,
1492                                NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
1493                                pkts_processed);
1494   vlib_node_increment_counter (vm, stats_node_index,
1495                                NAT_IN2OUT_ED_ERROR_TCP_PACKETS, tcp_packets);
1496   vlib_node_increment_counter (vm, stats_node_index,
1497                                NAT_IN2OUT_ED_ERROR_UDP_PACKETS, udp_packets);
1498   vlib_node_increment_counter (vm, stats_node_index,
1499                                NAT_IN2OUT_ED_ERROR_ICMP_PACKETS,
1500                                icmp_packets);
1501   vlib_node_increment_counter (vm, stats_node_index,
1502                                NAT_IN2OUT_ED_ERROR_OTHER_PACKETS,
1503                                other_packets);
1504   return frame->n_vectors;
1505 }
1506
1507 VLIB_NODE_FN (nat44_ed_in2out_node) (vlib_main_t * vm,
1508                                      vlib_node_runtime_t * node,
1509                                      vlib_frame_t * frame)
1510 {
1511   return nat44_ed_in2out_fast_path_node_fn_inline (vm, node, frame, 0);
1512 }
1513
1514 /* *INDENT-OFF* */
1515 VLIB_REGISTER_NODE (nat44_ed_in2out_node) = {
1516   .name = "nat44-ed-in2out",
1517   .vector_size = sizeof (u32),
1518   .sibling_of = "nat-default",
1519   .format_trace = format_nat_in2out_ed_trace,
1520   .type = VLIB_NODE_TYPE_INTERNAL,
1521   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1522   .error_strings = nat_in2out_ed_error_strings,
1523   .runtime_data_bytes = sizeof (snat_runtime_t),
1524 };
1525 /* *INDENT-ON* */
1526
1527 VLIB_NODE_FN (nat44_ed_in2out_output_node) (vlib_main_t * vm,
1528                                             vlib_node_runtime_t * node,
1529                                             vlib_frame_t * frame)
1530 {
1531   return nat44_ed_in2out_fast_path_node_fn_inline (vm, node, frame, 1);
1532 }
1533
1534 /* *INDENT-OFF* */
1535 VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = {
1536   .name = "nat44-ed-in2out-output",
1537   .vector_size = sizeof (u32),
1538   .sibling_of = "nat-default",
1539   .format_trace = format_nat_in2out_ed_trace,
1540   .type = VLIB_NODE_TYPE_INTERNAL,
1541   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1542   .error_strings = nat_in2out_ed_error_strings,
1543   .runtime_data_bytes = sizeof (snat_runtime_t),
1544 };
1545 /* *INDENT-ON* */
1546
1547 VLIB_NODE_FN (nat44_ed_in2out_slowpath_node) (vlib_main_t * vm,
1548                                               vlib_node_runtime_t *
1549                                               node, vlib_frame_t * frame)
1550 {
1551   return nat44_ed_in2out_slow_path_node_fn_inline (vm, node, frame, 0);
1552 }
1553
1554 /* *INDENT-OFF* */
1555 VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = {
1556   .name = "nat44-ed-in2out-slowpath",
1557   .vector_size = sizeof (u32),
1558   .sibling_of = "nat-default",
1559   .format_trace = format_nat_in2out_ed_trace,
1560   .type = VLIB_NODE_TYPE_INTERNAL,
1561   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1562   .error_strings = nat_in2out_ed_error_strings,
1563   .runtime_data_bytes = sizeof (snat_runtime_t),
1564 };
1565 /* *INDENT-ON* */
1566
1567 VLIB_NODE_FN (nat44_ed_in2out_output_slowpath_node) (vlib_main_t * vm,
1568                                                      vlib_node_runtime_t
1569                                                      * node,
1570                                                      vlib_frame_t * frame)
1571 {
1572   return nat44_ed_in2out_slow_path_node_fn_inline (vm, node, frame, 1);
1573 }
1574
1575 /* *INDENT-OFF* */
1576 VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = {
1577   .name = "nat44-ed-in2out-output-slowpath",
1578   .vector_size = sizeof (u32),
1579   .sibling_of = "nat-default",
1580   .format_trace = format_nat_in2out_ed_trace,
1581   .type = VLIB_NODE_TYPE_INTERNAL,
1582   .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1583   .error_strings = nat_in2out_ed_error_strings,
1584   .runtime_data_bytes = sizeof (snat_runtime_t),
1585 };
1586 /* *INDENT-ON* */
1587
1588 static u8 *
1589 format_nat_pre_trace (u8 * s, va_list * args)
1590 {
1591   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1592   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1593   nat_pre_trace_t *t = va_arg (*args, nat_pre_trace_t *);
1594   return format (s, "in2out next_index %d arc_next_index %d", t->next_index,
1595                  t->arc_next_index);
1596 }
1597
1598 VLIB_NODE_FN (nat_pre_in2out_node)
1599   (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1600 {
1601   return nat_pre_node_fn_inline (vm, node, frame,
1602                                  NAT_NEXT_IN2OUT_ED_FAST_PATH);
1603 }
1604
1605 /* *INDENT-OFF* */
1606 VLIB_REGISTER_NODE (nat_pre_in2out_node) = {
1607   .name = "nat-pre-in2out",
1608   .vector_size = sizeof (u32),
1609   .sibling_of = "nat-default",
1610   .format_trace = format_nat_pre_trace,
1611   .type = VLIB_NODE_TYPE_INTERNAL,
1612   .n_errors = 0,
1613 };
1614 /* *INDENT-ON* */
1615
1616 /*
1617  * fd.io coding-style-patch-verification: ON
1618  *
1619  * Local Variables:
1620  * eval: (c-set-style "gnu")
1621  * End:
1622  */