src/plugins/nat/in2out.c

   1 /*
   2  * Copyright (c) 2016 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 inside to outside network translation
  18  */
  19
  20 #include <vlib/vlib.h>
  21 #include <vnet/vnet.h>
  22 #include <vnet/pg/pg.h>
  23
  24 #include <vnet/ip/ip.h>
  25 #include <vnet/ethernet/ethernet.h>
  26 #include <vnet/fib/ip4_fib.h>
  27 #include <nat/nat.h>
  28 #include <nat/nat_ipfix_logging.h>
  29 #include <nat/nat_reass.h>
  30 #include <nat/nat_inlines.h>
  31 #include <nat/nat_syslog.h>
  32
  33 #include <vppinfra/hash.h>
  34 #include <vppinfra/error.h>
  35 #include <vppinfra/elog.h>
  36
  37 typedef struct
  38 {
  39   u32 sw_if_index;
  40   u32 next_index;
  41   u32 session_index;
  42   u32 is_slow_path;
  43 } snat_in2out_trace_t;
  44
  45 /* packet trace format function */
  46 static u8 *
  47 format_snat_in2out_trace (u8 * s, va_list * args)
  48 {
  49   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  50   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  51   snat_in2out_trace_t *t = va_arg (*args, snat_in2out_trace_t *);
  52   char *tag;
  53
  54   tag = t->is_slow_path ? "NAT44_IN2OUT_SLOW_PATH" : "NAT44_IN2OUT_FAST_PATH";
  55
  56   s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
  57               t->sw_if_index, t->next_index, t->session_index);
  58
  59   return s;
  60 }
  61
  62 static u8 *
  63 format_snat_in2out_fast_trace (u8 * s, va_list * args)
  64 {
  65   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  66   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  67   snat_in2out_trace_t *t = va_arg (*args, snat_in2out_trace_t *);
  68
  69   s = format (s, "NAT44_IN2OUT_FAST: sw_if_index %d, next index %d",
  70               t->sw_if_index, t->next_index);
  71
  72   return s;
  73 }
  74
  75 #define foreach_snat_in2out_error                       \
  76 _(UNSUPPORTED_PROTOCOL, "unsupported protocol")         \
  77 _(IN2OUT_PACKETS, "good in2out packets processed")      \
  78 _(OUT_OF_PORTS, "out of ports")                         \
  79 _(BAD_OUTSIDE_FIB, "outside VRF ID not found")          \
  80 _(BAD_ICMP_TYPE, "unsupported ICMP type")               \
  81 _(NO_TRANSLATION, "no translation")                     \
  82 _(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded")   \
  83 _(DROP_FRAGMENT, "drop fragment")                       \
  84 _(MAX_REASS, "maximum reassemblies exceeded")           \
  85 _(MAX_FRAG, "maximum fragments per reassembly exceeded")\
  86 _(TCP_PACKETS, "TCP packets")                           \
  87 _(UDP_PACKETS, "UDP packets")                           \
  88 _(ICMP_PACKETS, "ICMP packets")                         \
  89 _(OTHER_PACKETS, "other protocol packets")              \
  90 _(FRAGMENTS, "fragments")                               \
  91 _(CACHED_FRAGMENTS, "cached fragments")                 \
  92 _(PROCESSED_FRAGMENTS, "processed fragments")
  93
  94 typedef enum
  95 {
  96 #define _(sym,str) SNAT_IN2OUT_ERROR_##sym,
  97   foreach_snat_in2out_error
  98 #undef _
  99     SNAT_IN2OUT_N_ERROR,
 100 } snat_in2out_error_t;
 101
 102 static char *snat_in2out_error_strings[] = {
 103 #define _(sym,string) string,
 104   foreach_snat_in2out_error
 105 #undef _
 106 };
 107
 108 typedef enum
 109 {
 110   SNAT_IN2OUT_NEXT_LOOKUP,
 111   SNAT_IN2OUT_NEXT_DROP,
 112   SNAT_IN2OUT_NEXT_ICMP_ERROR,
 113   SNAT_IN2OUT_NEXT_SLOW_PATH,
 114   SNAT_IN2OUT_NEXT_REASS,
 115   SNAT_IN2OUT_N_NEXT,
 116 } snat_in2out_next_t;
 117
 118 static inline int
 119 snat_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
 120                     u32 sw_if_index0, ip4_header_t * ip0, u32 proto0,
 121                     u32 rx_fib_index0, u32 thread_index)
 122 {
 123   udp_header_t *udp0 = ip4_next_header (ip0);
 124   snat_session_key_t key0, sm0;
 125   clib_bihash_kv_8_8_t kv0, value0;
 126
 127   key0.addr = ip0->dst_address;
 128   key0.port = udp0->dst_port;
 129   key0.protocol = proto0;
 130   key0.fib_index = sm->outside_fib_index;
 131   kv0.key = key0.as_u64;
 132
 133   /* NAT packet aimed at external address if */
 134   /* has active sessions */
 135   if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0,
 136                               &value0))
 137     {
 138       /* or is static mappings */
 139       if (!snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0, 0))
 140         return 0;
 141     }
 142   else
 143     return 0;
 144
 145   if (sm->forwarding_enabled)
 146     return 1;
 147
 148   return snat_not_translate_fast (sm, node, sw_if_index0, ip0, proto0,
 149                                   rx_fib_index0);
 150 }
 151
 152 static inline int
 153 nat_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip0,
 154                                   u32 proto0, u16 src_port, u16 dst_port,
 155                                   u32 thread_index, u32 sw_if_index)
 156 {
 157   snat_session_key_t key0;
 158   clib_bihash_kv_8_8_t kv0, value0;
 159   snat_interface_t *i;
 160
 161   /* src NAT check */
 162   key0.addr = ip0->src_address;
 163   key0.port = src_port;
 164   key0.protocol = proto0;
 165   key0.fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
 166   kv0.key = key0.as_u64;
 167
 168   if (!clib_bihash_search_8_8
 169       (&sm->per_thread_data[thread_index].out2in, &kv0, &value0))
 170     return 1;
 171
 172   /* dst NAT check */
 173   key0.addr = ip0->dst_address;
 174   key0.port = dst_port;
 175   key0.protocol = proto0;
 176   kv0.key = key0.as_u64;
 177   if (!clib_bihash_search_8_8
 178       (&sm->per_thread_data[thread_index].in2out, &kv0, &value0))
 179     {
 180       /* hairpinning */
 181     /* *INDENT-OFF* */
 182     pool_foreach (i, sm->output_feature_interfaces,
 183     ({
 184       if ((nat_interface_is_inside(i)) && (sw_if_index == i->sw_if_index))
 185         return 0;
 186     }));
 187     /* *INDENT-ON* */
 188       return 1;
 189     }
 190
 191   return 0;
 192 }
 193
 194 #ifndef CLIB_MARCH_VARIANT
 195 int
 196 nat44_i2o_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg)
 197 {
 198   snat_main_t *sm = &snat_main;
 199   nat44_is_idle_session_ctx_t *ctx = arg;
 200   snat_session_t *s;
 201   u64 sess_timeout_time;
 202   snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
 203                                                        ctx->thread_index);
 204   clib_bihash_kv_8_8_t s_kv;
 205
 206   s = pool_elt_at_index (tsm->sessions, kv->value);
 207   sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
 208   if (ctx->now >= sess_timeout_time)
 209     {
 210       s_kv.key = s->out2in.as_u64;
 211       if (clib_bihash_add_del_8_8 (&tsm->out2in, &s_kv, 0))
 212         nat_log_warn ("out2in key del failed");
 213
 214       snat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
 215                                            s->in2out.addr.as_u32,
 216                                            s->out2in.addr.as_u32,
 217                                            s->in2out.protocol,
 218                                            s->in2out.port,
 219                                            s->out2in.port,
 220                                            s->in2out.fib_index);
 221
 222       nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
 223                                &s->in2out.addr, s->in2out.port,
 224                                &s->out2in.addr, s->out2in.port,
 225                                s->in2out.protocol);
 226
 227       if (!snat_is_session_static (s))
 228         snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
 229                                             &s->out2in);
 230
 231       nat44_delete_session (sm, s, ctx->thread_index);
 232       return 1;
 233     }
 234
 235   return 0;
 236 }
 237 #endif
 238
 239 static u32
 240 slow_path (snat_main_t * sm, vlib_buffer_t * b0,
 241            ip4_header_t * ip0,
 242            u32 rx_fib_index0,
 243            snat_session_key_t * key0,
 244            snat_session_t ** sessionp,
 245            vlib_node_runtime_t * node, u32 next0, u32 thread_index, f64 now)
 246 {
 247   snat_user_t *u;
 248   snat_session_t *s = 0;
 249   clib_bihash_kv_8_8_t kv0;
 250   snat_session_key_t key1;
 251   udp_header_t *udp0 = ip4_next_header (ip0);
 252   u8 is_sm = 0;
 253   nat_outside_fib_t *outside_fib;
 254   fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
 255   u8 identity_nat;
 256   fib_prefix_t pfx = {
 257     .fp_proto = FIB_PROTOCOL_IP4,
 258     .fp_len = 32,
 259     .fp_addr = {
 260                 .ip4.as_u32 = ip0->dst_address.as_u32,
 261                 },
 262   };
 263   nat44_is_idle_session_ctx_t ctx0;
 264
 265   if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
 266     {
 267       b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED];
 268       nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
 269       nat_log_notice ("maximum sessions exceeded");
 270       return SNAT_IN2OUT_NEXT_DROP;
 271     }
 272
 273   key1.protocol = key0->protocol;
 274
 275   /* First try to match static mapping by local address and port */
 276   if (snat_static_mapping_match
 277       (sm, *key0, &key1, 0, 0, 0, 0, 0, &identity_nat))
 278     {
 279       /* Try to create dynamic translation */
 280       if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index0,
 281                                                thread_index, &key1,
 282                                                sm->port_per_thread,
 283                                                sm->per_thread_data
 284                                                [thread_index].snat_thread_index))
 285         {
 286           b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
 287           return SNAT_IN2OUT_NEXT_DROP;
 288         }
 289     }
 290   else
 291     {
 292       if (PREDICT_FALSE (identity_nat))
 293         {
 294           *sessionp = s;
 295           return next0;
 296         }
 297
 298       is_sm = 1;
 299     }
 300
 301   u = nat_user_get_or_create (sm, &ip0->src_address, rx_fib_index0,
 302                               thread_index);
 303   if (!u)
 304     {
 305       nat_log_warn ("create NAT user failed");
 306       return SNAT_IN2OUT_NEXT_DROP;
 307     }
 308
 309   s = nat_session_alloc_or_recycle (sm, u, thread_index);
 310   if (!s)
 311     {
 312       nat44_delete_user_with_no_session (sm, u, thread_index);
 313       nat_log_warn ("create NAT session failed");
 314       return SNAT_IN2OUT_NEXT_DROP;
 315     }
 316
 317   if (is_sm)
 318     s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
 319   user_session_increment (sm, u, is_sm);
 320   s->in2out = *key0;
 321   s->out2in = key1;
 322   s->out2in.protocol = key0->protocol;
 323   s->out2in.fib_index = sm->outside_fib_index;
 324   switch (vec_len (sm->outside_fibs))
 325     {
 326     case 0:
 327       s->out2in.fib_index = sm->outside_fib_index;
 328       break;
 329     case 1:
 330       s->out2in.fib_index = sm->outside_fibs[0].fib_index;
 331       break;
 332     default:
 333       /* *INDENT-OFF* */
 334       vec_foreach (outside_fib, sm->outside_fibs)
 335         {
 336           fei = fib_table_lookup (outside_fib->fib_index, &pfx);
 337           if (FIB_NODE_INDEX_INVALID != fei)
 338             {
 339               if (fib_entry_get_resolving_interface (fei) != ~0)
 340                 {
 341                   s->out2in.fib_index = outside_fib->fib_index;
 342                   break;
 343                 }
 344             }
 345         }
 346       /* *INDENT-ON* */
 347       break;
 348     }
 349   s->ext_host_addr.as_u32 = ip0->dst_address.as_u32;
 350   s->ext_host_port = udp0->dst_port;
 351   *sessionp = s;
 352
 353   /* Add to translation hashes */
 354   ctx0.now = now;
 355   ctx0.thread_index = thread_index;
 356   kv0.key = s->in2out.as_u64;
 357   kv0.value = s - sm->per_thread_data[thread_index].sessions;
 358   if (clib_bihash_add_or_overwrite_stale_8_8
 359       (&sm->per_thread_data[thread_index].in2out, &kv0,
 360        nat44_i2o_is_idle_session_cb, &ctx0))
 361     nat_log_notice ("in2out key add failed");
 362
 363   kv0.key = s->out2in.as_u64;
 364   kv0.value = s - sm->per_thread_data[thread_index].sessions;
 365
 366   if (clib_bihash_add_or_overwrite_stale_8_8
 367       (&sm->per_thread_data[thread_index].out2in, &kv0,
 368        nat44_o2i_is_idle_session_cb, &ctx0))
 369     nat_log_notice ("out2in key add failed");
 370
 371   /* log NAT event */
 372   snat_ipfix_logging_nat44_ses_create (thread_index,
 373                                        s->in2out.addr.as_u32,
 374                                        s->out2in.addr.as_u32,
 375                                        s->in2out.protocol,
 376                                        s->in2out.port,
 377                                        s->out2in.port, s->in2out.fib_index);
 378
 379   nat_syslog_nat44_apmadd (s->user_index, s->in2out.fib_index,
 380                            &s->in2out.addr, s->in2out.port, &s->out2in.addr,
 381                            s->out2in.port, s->in2out.protocol);
 382
 383   return next0;
 384 }
 385
 386 static_always_inline
 387   snat_in2out_error_t icmp_get_key (ip4_header_t * ip0,
 388                                     snat_session_key_t * p_key0)
 389 {
 390   icmp46_header_t *icmp0;
 391   snat_session_key_t key0;
 392   icmp_echo_header_t *echo0, *inner_echo0 = 0;
 393   ip4_header_t *inner_ip0 = 0;
 394   void *l4_header = 0;
 395   icmp46_header_t *inner_icmp0;
 396
 397   icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
 398   echo0 = (icmp_echo_header_t *) (icmp0 + 1);
 399
 400   if (!icmp_is_error_message (icmp0))
 401     {
 402       key0.protocol = SNAT_PROTOCOL_ICMP;
 403       key0.addr = ip0->src_address;
 404       key0.port = echo0->identifier;
 405     }
 406   else
 407     {
 408       inner_ip0 = (ip4_header_t *) (echo0 + 1);
 409       l4_header = ip4_next_header (inner_ip0);
 410       key0.protocol = ip_proto_to_snat_proto (inner_ip0->protocol);
 411       key0.addr = inner_ip0->dst_address;
 412       switch (key0.protocol)
 413         {
 414         case SNAT_PROTOCOL_ICMP:
 415           inner_icmp0 = (icmp46_header_t *) l4_header;
 416           inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
 417           key0.port = inner_echo0->identifier;
 418           break;
 419         case SNAT_PROTOCOL_UDP:
 420         case SNAT_PROTOCOL_TCP:
 421           key0.port = ((tcp_udp_header_t *) l4_header)->dst_port;
 422           break;
 423         default:
 424           return SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL;
 425         }
 426     }
 427   *p_key0 = key0;
 428   return -1;                    /* success */
 429 }
 430
 431 #ifndef CLIB_MARCH_VARIANT
 432 /**
 433  * Get address and port values to be used for ICMP packet translation
 434  * and create session if needed
 435  *
 436  * @param[in,out] sm             NAT main
 437  * @param[in,out] node           NAT node runtime
 438  * @param[in] thread_index       thread index
 439  * @param[in,out] b0             buffer containing packet to be translated
 440  * @param[out] p_proto           protocol used for matching
 441  * @param[out] p_value           address and port after NAT translation
 442  * @param[out] p_dont_translate  if packet should not be translated
 443  * @param d                      optional parameter
 444  * @param e                      optional parameter
 445  */
 446 u32
 447 icmp_match_in2out_slow (snat_main_t * sm, vlib_node_runtime_t * node,
 448                         u32 thread_index, vlib_buffer_t * b0,
 449                         ip4_header_t * ip0, u8 * p_proto,
 450                         snat_session_key_t * p_value,
 451                         u8 * p_dont_translate, void *d, void *e)
 452 {
 453   icmp46_header_t *icmp0;
 454   u32 sw_if_index0;
 455   u32 rx_fib_index0;
 456   snat_session_key_t key0;
 457   snat_session_t *s0 = 0;
 458   u8 dont_translate = 0;
 459   clib_bihash_kv_8_8_t kv0, value0;
 460   u32 next0 = ~0;
 461   int err;
 462
 463   icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
 464   sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 465   rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
 466
 467   err = icmp_get_key (ip0, &key0);
 468   if (err != -1)
 469     {
 470       b0->error = node->errors[err];
 471       next0 = SNAT_IN2OUT_NEXT_DROP;
 472       goto out;
 473     }
 474   key0.fib_index = rx_fib_index0;
 475
 476   kv0.key = key0.as_u64;
 477
 478   if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].in2out, &kv0,
 479                               &value0))
 480     {
 481       if (vnet_buffer (b0)->sw_if_index[VLIB_TX] != ~0)
 482         {
 483           if (PREDICT_FALSE (nat_not_translate_output_feature (sm, ip0,
 484                                                                key0.protocol,
 485                                                                key0.port,
 486                                                                key0.port,
 487                                                                thread_index,
 488                                                                sw_if_index0)))
 489             {
 490               dont_translate = 1;
 491               goto out;
 492             }
 493         }
 494       else
 495         {
 496           if (PREDICT_FALSE (snat_not_translate (sm, node, sw_if_index0,
 497                                                  ip0, SNAT_PROTOCOL_ICMP,
 498                                                  rx_fib_index0,
 499                                                  thread_index)))
 500             {
 501               dont_translate = 1;
 502               goto out;
 503             }
 504         }
 505
 506       if (PREDICT_FALSE (icmp_is_error_message (icmp0)))
 507         {
 508           b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
 509           next0 = SNAT_IN2OUT_NEXT_DROP;
 510           goto out;
 511         }
 512
 513       next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, &s0, node, next0,
 514                          thread_index, vlib_time_now (sm->vlib_main));
 515
 516       if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
 517         goto out;
 518
 519       if (!s0)
 520         {
 521           dont_translate = 1;
 522           goto out;
 523         }
 524     }
 525   else
 526     {
 527       if (PREDICT_FALSE (icmp0->type != ICMP4_echo_request &&
 528                          icmp0->type != ICMP4_echo_reply &&
 529                          !icmp_is_error_message (icmp0)))
 530         {
 531           b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
 532           next0 = SNAT_IN2OUT_NEXT_DROP;
 533           goto out;
 534         }
 535
 536       s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
 537                               value0.value);
 538     }
 539
 540 out:
 541   *p_proto = key0.protocol;
 542   if (s0)
 543     *p_value = s0->out2in;
 544   *p_dont_translate = dont_translate;
 545   if (d)
 546     *(snat_session_t **) d = s0;
 547   return next0;
 548 }
 549 #endif
 550
 551 #ifndef CLIB_MARCH_VARIANT
 552 /**
 553  * Get address and port values to be used for ICMP packet translation
 554  *
 555  * @param[in] sm                 NAT main
 556  * @param[in,out] node           NAT node runtime
 557  * @param[in] thread_index       thread index
 558  * @param[in,out] b0             buffer containing packet to be translated
 559  * @param[out] p_proto           protocol used for matching
 560  * @param[out] p_value           address and port after NAT translation
 561  * @param[out] p_dont_translate  if packet should not be translated
 562  * @param d                      optional parameter
 563  * @param e                      optional parameter
 564  */
 565 u32
 566 icmp_match_in2out_fast (snat_main_t * sm, vlib_node_runtime_t * node,
 567                         u32 thread_index, vlib_buffer_t * b0,
 568                         ip4_header_t * ip0, u8 * p_proto,
 569                         snat_session_key_t * p_value,
 570                         u8 * p_dont_translate, void *d, void *e)
 571 {
 572   icmp46_header_t *icmp0;
 573   u32 sw_if_index0;
 574   u32 rx_fib_index0;
 575   snat_session_key_t key0;
 576   snat_session_key_t sm0;
 577   u8 dont_translate = 0;
 578   u8 is_addr_only;
 579   u32 next0 = ~0;
 580   int err;
 581
 582   icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
 583   sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 584   rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
 585
 586   err = icmp_get_key (ip0, &key0);
 587   if (err != -1)
 588     {
 589       b0->error = node->errors[err];
 590       next0 = SNAT_IN2OUT_NEXT_DROP;
 591       goto out2;
 592     }
 593   key0.fib_index = rx_fib_index0;
 594
 595   if (snat_static_mapping_match
 596       (sm, key0, &sm0, 0, &is_addr_only, 0, 0, 0, 0))
 597     {
 598       if (PREDICT_FALSE (snat_not_translate_fast (sm, node, sw_if_index0, ip0,
 599                                                   IP_PROTOCOL_ICMP,
 600                                                   rx_fib_index0)))
 601         {
 602           dont_translate = 1;
 603           goto out;
 604         }
 605
 606       if (icmp_is_error_message (icmp0))
 607         {
 608           next0 = SNAT_IN2OUT_NEXT_DROP;
 609           goto out;
 610         }
 611
 612       b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
 613       next0 = SNAT_IN2OUT_NEXT_DROP;
 614       goto out;
 615     }
 616
 617   if (PREDICT_FALSE (icmp0->type != ICMP4_echo_request &&
 618                      (icmp0->type != ICMP4_echo_reply || !is_addr_only) &&
 619                      !icmp_is_error_message (icmp0)))
 620     {
 621       b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
 622       next0 = SNAT_IN2OUT_NEXT_DROP;
 623       goto out;
 624     }
 625
 626 out:
 627   *p_value = sm0;
 628 out2:
 629   *p_proto = key0.protocol;
 630   *p_dont_translate = dont_translate;
 631   return next0;
 632 }
 633 #endif
 634
 635 #ifndef CLIB_MARCH_VARIANT
 636 u32
 637 icmp_in2out (snat_main_t * sm,
 638              vlib_buffer_t * b0,
 639              ip4_header_t * ip0,
 640              icmp46_header_t * icmp0,
 641              u32 sw_if_index0,
 642              u32 rx_fib_index0,
 643              vlib_node_runtime_t * node,
 644              u32 next0, u32 thread_index, void *d, void *e)
 645 {
 646   snat_session_key_t sm0;
 647   u8 protocol;
 648   icmp_echo_header_t *echo0, *inner_echo0 = 0;
 649   ip4_header_t *inner_ip0;
 650   void *l4_header = 0;
 651   icmp46_header_t *inner_icmp0;
 652   u8 dont_translate;
 653   u32 new_addr0, old_addr0;
 654   u16 old_id0, new_id0;
 655   u16 old_checksum0, new_checksum0;
 656   ip_csum_t sum0;
 657   u16 checksum0;
 658   u32 next0_tmp;
 659
 660   echo0 = (icmp_echo_header_t *) (icmp0 + 1);
 661
 662   next0_tmp = sm->icmp_match_in2out_cb (sm, node, thread_index, b0, ip0,
 663                                         &protocol, &sm0, &dont_translate, d,
 664                                         e);
 665   if (next0_tmp != ~0)
 666     next0 = next0_tmp;
 667   if (next0 == SNAT_IN2OUT_NEXT_DROP || dont_translate)
 668     goto out;
 669
 670   if (PREDICT_TRUE (!ip4_is_fragment (ip0)))
 671     {
 672       sum0 = ip_incremental_checksum_buffer (sm->vlib_main, b0, (u8 *) icmp0 -
 673                                              (u8 *)
 674                                              vlib_buffer_get_current (b0),
 675                                              ntohs (ip0->length) -
 676                                              ip4_header_bytes (ip0), 0);
 677       checksum0 = ~ip_csum_fold (sum0);
 678       if (PREDICT_FALSE (checksum0 != 0 && checksum0 != 0xffff))
 679         {
 680           next0 = SNAT_IN2OUT_NEXT_DROP;
 681           goto out;
 682         }
 683     }
 684
 685   old_addr0 = ip0->src_address.as_u32;
 686   new_addr0 = ip0->src_address.as_u32 = sm0.addr.as_u32;
 687
 688   sum0 = ip0->checksum;
 689   sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
 690                          src_address /* changed member */ );
 691   ip0->checksum = ip_csum_fold (sum0);
 692
 693   if (icmp0->checksum == 0)
 694     icmp0->checksum = 0xffff;
 695
 696   if (!icmp_is_error_message (icmp0))
 697     {
 698       new_id0 = sm0.port;
 699       if (PREDICT_FALSE (new_id0 != echo0->identifier))
 700         {
 701           old_id0 = echo0->identifier;
 702           new_id0 = sm0.port;
 703           echo0->identifier = new_id0;
 704
 705           sum0 = icmp0->checksum;
 706           sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
 707                                  identifier);
 708           icmp0->checksum = ip_csum_fold (sum0);
 709         }
 710     }
 711   else
 712     {
 713       inner_ip0 = (ip4_header_t *) (echo0 + 1);
 714       l4_header = ip4_next_header (inner_ip0);
 715
 716       if (!ip4_header_checksum_is_valid (inner_ip0))
 717         {
 718           next0 = SNAT_IN2OUT_NEXT_DROP;
 719           goto out;
 720         }
 721
 722       /* update inner destination IP address */
 723       old_addr0 = inner_ip0->dst_address.as_u32;
 724       inner_ip0->dst_address = sm0.addr;
 725       new_addr0 = inner_ip0->dst_address.as_u32;
 726       sum0 = icmp0->checksum;
 727       sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
 728                              dst_address /* changed member */ );
 729       icmp0->checksum = ip_csum_fold (sum0);
 730
 731       /* update inner IP header checksum */
 732       old_checksum0 = inner_ip0->checksum;
 733       sum0 = inner_ip0->checksum;
 734       sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
 735                              dst_address /* changed member */ );
 736       inner_ip0->checksum = ip_csum_fold (sum0);
 737       new_checksum0 = inner_ip0->checksum;
 738       sum0 = icmp0->checksum;
 739       sum0 = ip_csum_update (sum0, old_checksum0, new_checksum0, ip4_header_t,
 740                              checksum);
 741       icmp0->checksum = ip_csum_fold (sum0);
 742
 743       switch (protocol)
 744         {
 745         case SNAT_PROTOCOL_ICMP:
 746           inner_icmp0 = (icmp46_header_t *) l4_header;
 747           inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
 748
 749           old_id0 = inner_echo0->identifier;
 750           new_id0 = sm0.port;
 751           inner_echo0->identifier = new_id0;
 752
 753           sum0 = icmp0->checksum;
 754           sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
 755                                  identifier);
 756           icmp0->checksum = ip_csum_fold (sum0);
 757           break;
 758         case SNAT_PROTOCOL_UDP:
 759         case SNAT_PROTOCOL_TCP:
 760           old_id0 = ((tcp_udp_header_t *) l4_header)->dst_port;
 761           new_id0 = sm0.port;
 762           ((tcp_udp_header_t *) l4_header)->dst_port = new_id0;
 763
 764           sum0 = icmp0->checksum;
 765           sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t,
 766                                  dst_port);
 767           icmp0->checksum = ip_csum_fold (sum0);
 768           break;
 769         default:
 770           ASSERT (0);
 771         }
 772     }
 773
 774   if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0)
 775     {
 776       if (sm->deterministic ||
 777           0 != snat_icmp_hairpinning (sm, b0, ip0, icmp0,
 778                                       sm->endpoint_dependent))
 779         vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
 780     }
 781
 782 out:
 783   return next0;
 784 }
 785 #endif
 786
 787 static inline u32
 788 icmp_in2out_slow_path (snat_main_t * sm,
 789                        vlib_buffer_t * b0,
 790                        ip4_header_t * ip0,
 791                        icmp46_header_t * icmp0,
 792                        u32 sw_if_index0,
 793                        u32 rx_fib_index0,
 794                        vlib_node_runtime_t * node,
 795                        u32 next0,
 796                        f64 now, u32 thread_index, snat_session_t ** p_s0)
 797 {
 798   next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
 799                        next0, thread_index, p_s0, 0);
 800   snat_session_t *s0 = *p_s0;
 801   if (PREDICT_TRUE (next0 != SNAT_IN2OUT_NEXT_DROP && s0))
 802     {
 803       /* Accounting */
 804       nat44_session_update_counters (s0, now,
 805                                      vlib_buffer_length_in_chain
 806                                      (sm->vlib_main, b0));
 807       /* Per-user LRU list maintenance */
 808       nat44_session_update_lru (sm, s0, thread_index);
 809     }
 810   return next0;
 811 }
 812
 813 static int
 814 nat_in2out_sm_unknown_proto (snat_main_t * sm,
 815                              vlib_buffer_t * b,
 816                              ip4_header_t * ip, u32 rx_fib_index)
 817 {
 818   clib_bihash_kv_8_8_t kv, value;
 819   snat_static_mapping_t *m;
 820   snat_session_key_t m_key;
 821   u32 old_addr, new_addr;
 822   ip_csum_t sum;
 823
 824   m_key.addr = ip->src_address;
 825   m_key.port = 0;
 826   m_key.protocol = 0;
 827   m_key.fib_index = rx_fib_index;
 828   kv.key = m_key.as_u64;
 829   if (clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
 830     return 1;
 831
 832   m = pool_elt_at_index (sm->static_mappings, value.value);
 833
 834   old_addr = ip->src_address.as_u32;
 835   new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
 836   sum = ip->checksum;
 837   sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
 838   ip->checksum = ip_csum_fold (sum);
 839
 840
 841   /* Hairpinning */
 842   if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
 843     {
 844       vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
 845       nat_hairpinning_sm_unknown_proto (sm, b, ip);
 846     }
 847
 848   return 0;
 849 }
 850
 851 static inline uword
 852 snat_in2out_node_fn_inline (vlib_main_t * vm,
 853                             vlib_node_runtime_t * node,
 854                             vlib_frame_t * frame, int is_slow_path,
 855                             int is_output_feature)
 856 {
 857   u32 n_left_from, *from, *to_next;
 858   snat_in2out_next_t next_index;
 859   u32 pkts_processed = 0;
 860   snat_main_t *sm = &snat_main;
 861   f64 now = vlib_time_now (vm);
 862   u32 stats_node_index;
 863   u32 thread_index = vm->thread_index;
 864   u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
 865     0, fragments = 0;
 866
 867   stats_node_index = is_slow_path ? sm->in2out_slowpath_node_index :
 868     sm->in2out_node_index;
 869
 870   from = vlib_frame_vector_args (frame);
 871   n_left_from = frame->n_vectors;
 872   next_index = node->cached_next_index;
 873
 874   while (n_left_from > 0)
 875     {
 876       u32 n_left_to_next;
 877
 878       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 879
 880       while (n_left_from >= 4 && n_left_to_next >= 2)
 881         {
 882           u32 bi0, bi1;
 883           vlib_buffer_t *b0, *b1;
 884           u32 next0, next1;
 885           u32 sw_if_index0, sw_if_index1;
 886           ip4_header_t *ip0, *ip1;
 887           ip_csum_t sum0, sum1;
 888           u32 new_addr0, old_addr0, new_addr1, old_addr1;
 889           u16 old_port0, new_port0, old_port1, new_port1;
 890           udp_header_t *udp0, *udp1;
 891           tcp_header_t *tcp0, *tcp1;
 892           icmp46_header_t *icmp0, *icmp1;
 893           snat_session_key_t key0, key1;
 894           u32 rx_fib_index0, rx_fib_index1;
 895           u32 proto0, proto1;
 896           snat_session_t *s0 = 0, *s1 = 0;
 897           clib_bihash_kv_8_8_t kv0, value0, kv1, value1;
 898           u32 iph_offset0 = 0, iph_offset1 = 0;
 899
 900           /* Prefetch next iteration. */
 901           {
 902             vlib_buffer_t *p2, *p3;
 903
 904             p2 = vlib_get_buffer (vm, from[2]);
 905             p3 = vlib_get_buffer (vm, from[3]);
 906
 907             vlib_prefetch_buffer_header (p2, LOAD);
 908             vlib_prefetch_buffer_header (p3, LOAD);
 909
 910             CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
 911             CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
 912           }
 913
 914           /* speculatively enqueue b0 and b1 to the current next frame */
 915           to_next[0] = bi0 = from[0];
 916           to_next[1] = bi1 = from[1];
 917           from += 2;
 918           to_next += 2;
 919           n_left_from -= 2;
 920           n_left_to_next -= 2;
 921
 922           b0 = vlib_get_buffer (vm, bi0);
 923           b1 = vlib_get_buffer (vm, bi1);
 924
 925           if (is_output_feature)
 926             iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
 927
 928           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
 929                                   iph_offset0);
 930
 931           udp0 = ip4_next_header (ip0);
 932           tcp0 = (tcp_header_t *) udp0;
 933           icmp0 = (icmp46_header_t *) udp0;
 934
 935           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 936           rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
 937                                    sw_if_index0);
 938
 939           next0 = next1 = SNAT_IN2OUT_NEXT_LOOKUP;
 940
 941           if (PREDICT_FALSE (ip0->ttl == 1))
 942             {
 943               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 944               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
 945                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
 946                                            0);
 947               next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
 948               goto trace00;
 949             }
 950
 951           proto0 = ip_proto_to_snat_proto (ip0->protocol);
 952
 953           /* Next configured feature, probably ip4-lookup */
 954           if (is_slow_path)
 955             {
 956               if (PREDICT_FALSE (proto0 == ~0))
 957                 {
 958                   if (nat_in2out_sm_unknown_proto
 959                       (sm, b0, ip0, rx_fib_index0))
 960                     {
 961                       next0 = SNAT_IN2OUT_NEXT_DROP;
 962                       b0->error =
 963                         node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
 964                     }
 965                   other_packets++;
 966                   goto trace00;
 967                 }
 968
 969               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
 970                 {
 971                   next0 = icmp_in2out_slow_path
 972                     (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0,
 973                      node, next0, now, thread_index, &s0);
 974                   icmp_packets++;
 975                   goto trace00;
 976                 }
 977             }
 978           else
 979             {
 980               if (PREDICT_FALSE (proto0 == ~0))
 981                 {
 982                   next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
 983                   goto trace00;
 984                 }
 985
 986               if (ip4_is_fragment (ip0))
 987                 {
 988                   next0 = SNAT_IN2OUT_NEXT_REASS;
 989                   fragments++;
 990                   goto trace00;
 991                 }
 992
 993               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
 994                 {
 995                   next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
 996                   goto trace00;
 997                 }
 998             }
 999
1000           key0.addr = ip0->src_address;
1001           key0.port = udp0->src_port;
1002           key0.protocol = proto0;
1003           key0.fib_index = rx_fib_index0;
1004
1005           kv0.key = key0.as_u64;
1006
1007           if (PREDICT_FALSE
1008               (clib_bihash_search_8_8
1009                (&sm->per_thread_data[thread_index].in2out, &kv0,
1010                 &value0) != 0))
1011             {
1012               if (is_slow_path)
1013                 {
1014                   if (is_output_feature)
1015                     {
1016                       if (PREDICT_FALSE (nat_not_translate_output_feature (sm,
1017                                                                            ip0,
1018                                                                            proto0,
1019                                                                            udp0->src_port,
1020                                                                            udp0->dst_port,
1021                                                                            thread_index,
1022                                                                            sw_if_index0)))
1023                         goto trace00;
1024                     }
1025                   else
1026                     {
1027                       if (PREDICT_FALSE
1028                           (snat_not_translate
1029                            (sm, node, sw_if_index0, ip0, proto0,
1030                             rx_fib_index0, thread_index)))
1031                         goto trace00;
1032                     }
1033
1034                   next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
1035                                      &s0, node, next0, thread_index, now);
1036                   if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
1037                     goto trace00;
1038
1039                   if (PREDICT_FALSE (!s0))
1040                     goto trace00;
1041                 }
1042               else
1043                 {
1044                   next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1045                   goto trace00;
1046                 }
1047             }
1048           else
1049             s0 =
1050               pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1051                                  value0.value);
1052
1053           b0->flags |= VNET_BUFFER_F_IS_NATED;
1054
1055           old_addr0 = ip0->src_address.as_u32;
1056           ip0->src_address = s0->out2in.addr;
1057           new_addr0 = ip0->src_address.as_u32;
1058           if (!is_output_feature)
1059             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1060
1061           sum0 = ip0->checksum;
1062           sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1063                                  ip4_header_t,
1064                                  src_address /* changed member */ );
1065           ip0->checksum = ip_csum_fold (sum0);
1066
1067           if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1068             {
1069               old_port0 = tcp0->src_port;
1070               tcp0->src_port = s0->out2in.port;
1071               new_port0 = tcp0->src_port;
1072
1073               sum0 = tcp0->checksum;
1074               sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1075                                      ip4_header_t,
1076                                      dst_address /* changed member */ );
1077               sum0 = ip_csum_update (sum0, old_port0, new_port0,
1078                                      ip4_header_t /* cheat */ ,
1079                                      length /* changed member */ );
1080               mss_clamping (sm, tcp0, &sum0);
1081               tcp0->checksum = ip_csum_fold (sum0);
1082               tcp_packets++;
1083             }
1084           else
1085             {
1086               old_port0 = udp0->src_port;
1087               udp0->src_port = s0->out2in.port;
1088               udp0->checksum = 0;
1089               udp_packets++;
1090             }
1091
1092           /* Accounting */
1093           nat44_session_update_counters (s0, now,
1094                                          vlib_buffer_length_in_chain (vm,
1095                                                                       b0));
1096           /* Per-user LRU list maintenance */
1097           nat44_session_update_lru (sm, s0, thread_index);
1098         trace00:
1099
1100           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1101                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1102             {
1103               snat_in2out_trace_t *t =
1104                 vlib_add_trace (vm, node, b0, sizeof (*t));
1105               t->is_slow_path = is_slow_path;
1106               t->sw_if_index = sw_if_index0;
1107               t->next_index = next0;
1108               t->session_index = ~0;
1109               if (s0)
1110                 t->session_index =
1111                   s0 - sm->per_thread_data[thread_index].sessions;
1112             }
1113
1114           pkts_processed += next0 == SNAT_IN2OUT_NEXT_LOOKUP;
1115
1116           if (is_output_feature)
1117             iph_offset1 = vnet_buffer (b1)->ip.save_rewrite_length;
1118
1119           ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
1120                                   iph_offset1);
1121
1122           udp1 = ip4_next_header (ip1);
1123           tcp1 = (tcp_header_t *) udp1;
1124           icmp1 = (icmp46_header_t *) udp1;
1125
1126           sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
1127           rx_fib_index1 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
1128                                    sw_if_index1);
1129
1130           if (PREDICT_FALSE (ip1->ttl == 1))
1131             {
1132               vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1133               icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
1134                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
1135                                            0);
1136               next1 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
1137               goto trace01;
1138             }
1139
1140           proto1 = ip_proto_to_snat_proto (ip1->protocol);
1141
1142           /* Next configured feature, probably ip4-lookup */
1143           if (is_slow_path)
1144             {
1145               if (PREDICT_FALSE (proto1 == ~0))
1146                 {
1147                   if (nat_in2out_sm_unknown_proto
1148                       (sm, b1, ip1, rx_fib_index1))
1149                     {
1150                       next1 = SNAT_IN2OUT_NEXT_DROP;
1151                       b1->error =
1152                         node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
1153                     }
1154                   other_packets++;
1155                   goto trace01;
1156                 }
1157
1158               if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1159                 {
1160                   next1 = icmp_in2out_slow_path
1161                     (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
1162                      next1, now, thread_index, &s1);
1163                   icmp_packets++;
1164                   goto trace01;
1165                 }
1166             }
1167           else
1168             {
1169               if (PREDICT_FALSE (proto1 == ~0))
1170                 {
1171                   next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1172                   goto trace01;
1173                 }
1174
1175               if (ip4_is_fragment (ip1))
1176                 {
1177                   next1 = SNAT_IN2OUT_NEXT_REASS;
1178                   fragments++;
1179                   goto trace01;
1180                 }
1181
1182               if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1183                 {
1184                   next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1185                   goto trace01;
1186                 }
1187             }
1188
1189           key1.addr = ip1->src_address;
1190           key1.port = udp1->src_port;
1191           key1.protocol = proto1;
1192           key1.fib_index = rx_fib_index1;
1193
1194           kv1.key = key1.as_u64;
1195
1196           if (PREDICT_FALSE
1197               (clib_bihash_search_8_8
1198                (&sm->per_thread_data[thread_index].in2out, &kv1,
1199                 &value1) != 0))
1200             {
1201               if (is_slow_path)
1202                 {
1203                   if (is_output_feature)
1204                     {
1205                       if (PREDICT_FALSE (nat_not_translate_output_feature (sm,
1206                                                                            ip1,
1207                                                                            proto1,
1208                                                                            udp1->src_port,
1209                                                                            udp1->dst_port,
1210                                                                            thread_index,
1211                                                                            sw_if_index1)))
1212                         goto trace01;
1213                     }
1214                   else
1215                     {
1216                       if (PREDICT_FALSE
1217                           (snat_not_translate
1218                            (sm, node, sw_if_index1, ip1, proto1,
1219                             rx_fib_index1, thread_index)))
1220                         goto trace01;
1221                     }
1222
1223                   next1 = slow_path (sm, b1, ip1, rx_fib_index1, &key1,
1224                                      &s1, node, next1, thread_index, now);
1225                   if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP))
1226                     goto trace01;
1227
1228                   if (PREDICT_FALSE (!s1))
1229                     goto trace01;
1230                 }
1231               else
1232                 {
1233                   next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1234                   goto trace01;
1235                 }
1236             }
1237           else
1238             s1 =
1239               pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1240                                  value1.value);
1241
1242           b1->flags |= VNET_BUFFER_F_IS_NATED;
1243
1244           old_addr1 = ip1->src_address.as_u32;
1245           ip1->src_address = s1->out2in.addr;
1246           new_addr1 = ip1->src_address.as_u32;
1247           if (!is_output_feature)
1248             vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
1249
1250           sum1 = ip1->checksum;
1251           sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1252                                  ip4_header_t,
1253                                  src_address /* changed member */ );
1254           ip1->checksum = ip_csum_fold (sum1);
1255
1256           if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1257             {
1258               old_port1 = tcp1->src_port;
1259               tcp1->src_port = s1->out2in.port;
1260               new_port1 = tcp1->src_port;
1261
1262               sum1 = tcp1->checksum;
1263               sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1264                                      ip4_header_t,
1265                                      dst_address /* changed member */ );
1266               sum1 = ip_csum_update (sum1, old_port1, new_port1,
1267                                      ip4_header_t /* cheat */ ,
1268                                      length /* changed member */ );
1269               mss_clamping (sm, tcp1, &sum1);
1270               tcp1->checksum = ip_csum_fold (sum1);
1271               tcp_packets++;
1272             }
1273           else
1274             {
1275               old_port1 = udp1->src_port;
1276               udp1->src_port = s1->out2in.port;
1277               udp1->checksum = 0;
1278               udp_packets++;
1279             }
1280
1281           /* Accounting */
1282           nat44_session_update_counters (s1, now,
1283                                          vlib_buffer_length_in_chain (vm,
1284                                                                       b1));
1285           /* Per-user LRU list maintenance */
1286           nat44_session_update_lru (sm, s1, thread_index);
1287         trace01:
1288
1289           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1290                              && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1291             {
1292               snat_in2out_trace_t *t =
1293                 vlib_add_trace (vm, node, b1, sizeof (*t));
1294               t->sw_if_index = sw_if_index1;
1295               t->next_index = next1;
1296               t->session_index = ~0;
1297               if (s1)
1298                 t->session_index =
1299                   s1 - sm->per_thread_data[thread_index].sessions;
1300             }
1301
1302           pkts_processed += next1 == SNAT_IN2OUT_NEXT_LOOKUP;
1303
1304           /* verify speculative enqueues, maybe switch current next frame */
1305           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1306                                            to_next, n_left_to_next,
1307                                            bi0, bi1, next0, next1);
1308         }
1309
1310       while (n_left_from > 0 && n_left_to_next > 0)
1311         {
1312           u32 bi0;
1313           vlib_buffer_t *b0;
1314           u32 next0;
1315           u32 sw_if_index0;
1316           ip4_header_t *ip0;
1317           ip_csum_t sum0;
1318           u32 new_addr0, old_addr0;
1319           u16 old_port0, new_port0;
1320           udp_header_t *udp0;
1321           tcp_header_t *tcp0;
1322           icmp46_header_t *icmp0;
1323           snat_session_key_t key0;
1324           u32 rx_fib_index0;
1325           u32 proto0;
1326           snat_session_t *s0 = 0;
1327           clib_bihash_kv_8_8_t kv0, value0;
1328           u32 iph_offset0 = 0;
1329
1330           /* speculatively enqueue b0 to the current next frame */
1331           bi0 = from[0];
1332           to_next[0] = bi0;
1333           from += 1;
1334           to_next += 1;
1335           n_left_from -= 1;
1336           n_left_to_next -= 1;
1337
1338           b0 = vlib_get_buffer (vm, bi0);
1339           next0 = SNAT_IN2OUT_NEXT_LOOKUP;
1340
1341           if (is_output_feature)
1342             iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1343
1344           ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1345                                   iph_offset0);
1346
1347           udp0 = ip4_next_header (ip0);
1348           tcp0 = (tcp_header_t *) udp0;
1349           icmp0 = (icmp46_header_t *) udp0;
1350
1351           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1352           rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
1353                                    sw_if_index0);
1354
1355           if (PREDICT_FALSE (ip0->ttl == 1))
1356             {
1357               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1358               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1359                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
1360                                            0);
1361               next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
1362               goto trace0;
1363             }
1364
1365           proto0 = ip_proto_to_snat_proto (ip0->protocol);
1366
1367           /* Next configured feature, probably ip4-lookup */
1368           if (is_slow_path)
1369             {
1370               if (PREDICT_FALSE (proto0 == ~0))
1371                 {
1372                   if (nat_in2out_sm_unknown_proto
1373                       (sm, b0, ip0, rx_fib_index0))
1374                     {
1375                       next0 = SNAT_IN2OUT_NEXT_DROP;
1376                       b0->error =
1377                         node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
1378                     }
1379                   other_packets++;
1380                   goto trace0;
1381                 }
1382
1383               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1384                 {
1385                   next0 = icmp_in2out_slow_path
1386                     (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1387                      next0, now, thread_index, &s0);
1388                   icmp_packets++;
1389                   goto trace0;
1390                 }
1391             }
1392           else
1393             {
1394               if (PREDICT_FALSE (proto0 == ~0))
1395                 {
1396                   next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1397                   goto trace0;
1398                 }
1399
1400               if (ip4_is_fragment (ip0))
1401                 {
1402                   next0 = SNAT_IN2OUT_NEXT_REASS;
1403                   fragments++;
1404                   goto trace0;
1405                 }
1406
1407               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1408                 {
1409                   next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1410                   goto trace0;
1411                 }
1412             }
1413
1414           key0.addr = ip0->src_address;
1415           key0.port = udp0->src_port;
1416           key0.protocol = proto0;
1417           key0.fib_index = rx_fib_index0;
1418
1419           kv0.key = key0.as_u64;
1420
1421           if (clib_bihash_search_8_8
1422               (&sm->per_thread_data[thread_index].in2out, &kv0, &value0))
1423             {
1424               if (is_slow_path)
1425                 {
1426                   if (is_output_feature)
1427                     {
1428                       if (PREDICT_FALSE (nat_not_translate_output_feature (sm,
1429                                                                            ip0,
1430                                                                            proto0,
1431                                                                            udp0->src_port,
1432                                                                            udp0->dst_port,
1433                                                                            thread_index,
1434                                                                            sw_if_index0)))
1435                         goto trace0;
1436                     }
1437                   else
1438                     {
1439                       if (PREDICT_FALSE
1440                           (snat_not_translate
1441                            (sm, node, sw_if_index0, ip0, proto0,
1442                             rx_fib_index0, thread_index)))
1443                         goto trace0;
1444                     }
1445
1446                   next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
1447                                      &s0, node, next0, thread_index, now);
1448
1449                   if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
1450                     goto trace0;
1451
1452                   if (PREDICT_FALSE (!s0))
1453                     goto trace0;
1454                 }
1455               else
1456                 {
1457                   next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1458                   goto trace0;
1459                 }
1460             }
1461           else
1462             s0 =
1463               pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1464                                  value0.value);
1465
1466           b0->flags |= VNET_BUFFER_F_IS_NATED;
1467
1468           old_addr0 = ip0->src_address.as_u32;
1469           ip0->src_address = s0->out2in.addr;
1470           new_addr0 = ip0->src_address.as_u32;
1471           if (!is_output_feature)
1472             vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1473
1474           sum0 = ip0->checksum;
1475           sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1476                                  ip4_header_t,
1477                                  src_address /* changed member */ );
1478           ip0->checksum = ip_csum_fold (sum0);
1479
1480           if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1481             {
1482               old_port0 = tcp0->src_port;
1483               tcp0->src_port = s0->out2in.port;
1484               new_port0 = tcp0->src_port;
1485
1486               sum0 = tcp0->checksum;
1487               sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1488                                      ip4_header_t,
1489                                      dst_address /* changed member */ );
1490               sum0 = ip_csum_update (sum0, old_port0, new_port0,
1491                                      ip4_header_t /* cheat */ ,
1492                                      length /* changed member */ );
1493               mss_clamping (sm, tcp0, &sum0);
1494               tcp0->checksum = ip_csum_fold (sum0);
1495               tcp_packets++;
1496             }
1497           else
1498             {
1499               old_port0 = udp0->src_port;
1500               udp0->src_port = s0->out2in.port;
1501               udp0->checksum = 0;
1502               udp_packets++;
1503             }
1504
1505           /* Accounting */
1506           nat44_session_update_counters (s0, now,
1507                                          vlib_buffer_length_in_chain (vm,
1508                                                                       b0));
1509           /* Per-user LRU list maintenance */
1510           nat44_session_update_lru (sm, s0, thread_index);
1511
1512         trace0:
1513           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1514                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1515             {
1516               snat_in2out_trace_t *t =
1517                 vlib_add_trace (vm, node, b0, sizeof (*t));
1518               t->is_slow_path = is_slow_path;
1519               t->sw_if_index = sw_if_index0;
1520               t->next_index = next0;
1521               t->session_index = ~0;
1522               if (s0)
1523                 t->session_index =
1524                   s0 - sm->per_thread_data[thread_index].sessions;
1525             }
1526
1527           pkts_processed += next0 == SNAT_IN2OUT_NEXT_LOOKUP;
1528
1529           /* verify speculative enqueue, maybe switch current next frame */
1530           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1531                                            to_next, n_left_to_next,
1532                                            bi0, next0);
1533         }
1534
1535       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1536     }
1537
1538   vlib_node_increment_counter (vm, stats_node_index,
1539                                SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
1540                                pkts_processed);
1541   vlib_node_increment_counter (vm, stats_node_index,
1542                                SNAT_IN2OUT_ERROR_TCP_PACKETS, tcp_packets);
1543   vlib_node_increment_counter (vm, stats_node_index,
1544                                SNAT_IN2OUT_ERROR_UDP_PACKETS, tcp_packets);
1545   vlib_node_increment_counter (vm, stats_node_index,
1546                                SNAT_IN2OUT_ERROR_ICMP_PACKETS, icmp_packets);
1547   vlib_node_increment_counter (vm, stats_node_index,
1548                                SNAT_IN2OUT_ERROR_OTHER_PACKETS,
1549                                other_packets);
1550   vlib_node_increment_counter (vm, stats_node_index,
1551                                SNAT_IN2OUT_ERROR_FRAGMENTS, fragments);
1552
1553   return frame->n_vectors;
1554 }
1555
1556 VLIB_NODE_FN (snat_in2out_node) (vlib_main_t * vm,
1557                                  vlib_node_runtime_t * node,
1558                                  vlib_frame_t * frame)
1559 {
1560   return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */ ,
1561                                      0);
1562 }
1563
1564 /* *INDENT-OFF* */
1565 VLIB_REGISTER_NODE (snat_in2out_node) = {
1566   .name = "nat44-in2out",
1567   .vector_size = sizeof (u32),
1568   .format_trace = format_snat_in2out_trace,
1569   .type = VLIB_NODE_TYPE_INTERNAL,
1570
1571   .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1572   .error_strings = snat_in2out_error_strings,
1573
1574   .runtime_data_bytes = sizeof (snat_runtime_t),
1575
1576   .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1577
1578   /* edit / add dispositions here */
1579   .next_nodes = {
1580     [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1581     [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1582     [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
1583     [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1584     [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
1585   },
1586 };
1587 /* *INDENT-ON* */
1588
1589 VLIB_NODE_FN (snat_in2out_output_node) (vlib_main_t * vm,
1590                                         vlib_node_runtime_t * node,
1591                                         vlib_frame_t * frame)
1592 {
1593   return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */ ,
1594                                      1);
1595 }
1596
1597 /* *INDENT-OFF* */
1598 VLIB_REGISTER_NODE (snat_in2out_output_node) = {
1599   .name = "nat44-in2out-output",
1600   .vector_size = sizeof (u32),
1601   .format_trace = format_snat_in2out_trace,
1602   .type = VLIB_NODE_TYPE_INTERNAL,
1603
1604   .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1605   .error_strings = snat_in2out_error_strings,
1606
1607   .runtime_data_bytes = sizeof (snat_runtime_t),
1608
1609   .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1610
1611   /* edit / add dispositions here */
1612   .next_nodes = {
1613     [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1614     [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
1615     [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
1616     [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1617     [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
1618   },
1619 };
1620 /* *INDENT-ON* */
1621
1622 VLIB_NODE_FN (snat_in2out_slowpath_node) (vlib_main_t * vm,
1623                                           vlib_node_runtime_t * node,
1624                                           vlib_frame_t * frame)
1625 {
1626   return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */ ,
1627                                      0);
1628 }
1629
1630 /* *INDENT-OFF* */
1631 VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = {
1632   .name = "nat44-in2out-slowpath",
1633   .vector_size = sizeof (u32),
1634   .format_trace = format_snat_in2out_trace,
1635   .type = VLIB_NODE_TYPE_INTERNAL,
1636
1637   .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1638   .error_strings = snat_in2out_error_strings,
1639
1640   .runtime_data_bytes = sizeof (snat_runtime_t),
1641
1642   .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1643
1644   /* edit / add dispositions here */
1645   .next_nodes = {
1646     [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1647     [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1648     [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
1649     [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1650     [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
1651   },
1652 };
1653 /* *INDENT-ON* */
1654
1655 VLIB_NODE_FN (snat_in2out_output_slowpath_node) (vlib_main_t * vm,
1656                                                  vlib_node_runtime_t * node,
1657                                                  vlib_frame_t * frame)
1658 {
1659   return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */ ,
1660                                      1);
1661 }
1662
1663 /* *INDENT-OFF* */
1664 VLIB_REGISTER_NODE (snat_in2out_output_slowpath_node) = {
1665   .name = "nat44-in2out-output-slowpath",
1666   .vector_size = sizeof (u32),
1667   .format_trace = format_snat_in2out_trace,
1668   .type = VLIB_NODE_TYPE_INTERNAL,
1669
1670   .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1671   .error_strings = snat_in2out_error_strings,
1672
1673   .runtime_data_bytes = sizeof (snat_runtime_t),
1674
1675   .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1676
1677   /* edit / add dispositions here */
1678   .next_nodes = {
1679     [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1680     [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
1681     [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
1682     [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1683     [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
1684   },
1685 };
1686 /* *INDENT-ON* */
1687
1688 VLIB_NODE_FN (nat44_in2out_reass_node) (vlib_main_t * vm,
1689                                         vlib_node_runtime_t * node,
1690                                         vlib_frame_t * frame)
1691 {
1692   u32 n_left_from, *from, *to_next;
1693   snat_in2out_next_t next_index;
1694   u32 pkts_processed = 0, cached_fragments = 0;
1695   snat_main_t *sm = &snat_main;
1696   f64 now = vlib_time_now (vm);
1697   u32 thread_index = vm->thread_index;
1698   snat_main_per_thread_data_t *per_thread_data =
1699     &sm->per_thread_data[thread_index];
1700   u32 *fragments_to_drop = 0;
1701   u32 *fragments_to_loopback = 0;
1702
1703   from = vlib_frame_vector_args (frame);
1704   n_left_from = frame->n_vectors;
1705   next_index = node->cached_next_index;
1706
1707   while (n_left_from > 0)
1708     {
1709       u32 n_left_to_next;
1710
1711       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1712
1713       while (n_left_from > 0 && n_left_to_next > 0)
1714         {
1715           u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
1716           vlib_buffer_t *b0;
1717           u32 next0;
1718           u8 cached0 = 0;
1719           ip4_header_t *ip0;
1720           nat_reass_ip4_t *reass0;
1721           udp_header_t *udp0;
1722           tcp_header_t *tcp0;
1723           icmp46_header_t *icmp0;
1724           snat_session_key_t key0;
1725           clib_bihash_kv_8_8_t kv0, value0;
1726           snat_session_t *s0 = 0;
1727           u16 old_port0, new_port0;
1728           ip_csum_t sum0;
1729
1730           /* speculatively enqueue b0 to the current next frame */
1731           bi0 = from[0];
1732           to_next[0] = bi0;
1733           from += 1;
1734           to_next += 1;
1735           n_left_from -= 1;
1736           n_left_to_next -= 1;
1737
1738           b0 = vlib_get_buffer (vm, bi0);
1739           next0 = SNAT_IN2OUT_NEXT_LOOKUP;
1740
1741           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1742           rx_fib_index0 =
1743             fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1744                                                  sw_if_index0);
1745
1746           if (PREDICT_FALSE (nat_reass_is_drop_frag (0)))
1747             {
1748               next0 = SNAT_IN2OUT_NEXT_DROP;
1749               b0->error = node->errors[SNAT_IN2OUT_ERROR_DROP_FRAGMENT];
1750               goto trace0;
1751             }
1752
1753           ip0 = (ip4_header_t *) vlib_buffer_get_current (b0);
1754           udp0 = ip4_next_header (ip0);
1755           tcp0 = (tcp_header_t *) udp0;
1756           icmp0 = (icmp46_header_t *) udp0;
1757           proto0 = ip_proto_to_snat_proto (ip0->protocol);
1758
1759           reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
1760                                                  ip0->dst_address,
1761                                                  ip0->fragment_id,
1762                                                  ip0->protocol,
1763                                                  1, &fragments_to_drop);
1764
1765           if (PREDICT_FALSE (!reass0))
1766             {
1767               next0 = SNAT_IN2OUT_NEXT_DROP;
1768               b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_REASS];
1769               nat_log_notice ("maximum reassemblies exceeded");
1770               goto trace0;
1771             }
1772
1773           if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1774             {
1775               if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1776                 {
1777                   next0 = icmp_in2out_slow_path
1778                     (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1779                      next0, now, thread_index, &s0);
1780
1781                   if (PREDICT_TRUE (next0 != SNAT_IN2OUT_NEXT_DROP))
1782                     {
1783                       if (s0)
1784                         reass0->sess_index = s0 - per_thread_data->sessions;
1785                       else
1786                         reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1787                       nat_ip4_reass_get_frags (reass0,
1788                                                &fragments_to_loopback);
1789                     }
1790
1791                   goto trace0;
1792                 }
1793
1794               key0.addr = ip0->src_address;
1795               key0.port = udp0->src_port;
1796               key0.protocol = proto0;
1797               key0.fib_index = rx_fib_index0;
1798               kv0.key = key0.as_u64;
1799
1800               if (clib_bihash_search_8_8
1801                   (&per_thread_data->in2out, &kv0, &value0))
1802                 {
1803                   if (PREDICT_FALSE
1804                       (snat_not_translate
1805                        (sm, node, sw_if_index0, ip0, proto0, rx_fib_index0,
1806                         thread_index)))
1807                     goto trace0;
1808
1809                   next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
1810                                      &s0, node, next0, thread_index, now);
1811
1812                   if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
1813                     goto trace0;
1814
1815                   if (PREDICT_FALSE (!s0))
1816                     goto trace0;
1817
1818                   reass0->sess_index = s0 - per_thread_data->sessions;
1819                 }
1820               else
1821                 {
1822                   s0 = pool_elt_at_index (per_thread_data->sessions,
1823                                           value0.value);
1824                   reass0->sess_index = value0.value;
1825                 }
1826               nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
1827             }
1828           else
1829             {
1830               if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
1831                 {
1832                   if (nat_ip4_reass_add_fragment
1833                       (thread_index, reass0, bi0, &fragments_to_drop))
1834                     {
1835                       b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_FRAG];
1836                       nat_log_notice
1837                         ("maximum fragments per reassembly exceeded");
1838                       next0 = SNAT_IN2OUT_NEXT_DROP;
1839                       goto trace0;
1840                     }
1841                   cached0 = 1;
1842                   goto trace0;
1843                 }
1844               s0 = pool_elt_at_index (per_thread_data->sessions,
1845                                       reass0->sess_index);
1846             }
1847
1848           old_addr0 = ip0->src_address.as_u32;
1849           ip0->src_address = s0->out2in.addr;
1850           new_addr0 = ip0->src_address.as_u32;
1851           vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1852
1853           sum0 = ip0->checksum;
1854           sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1855                                  ip4_header_t,
1856                                  src_address /* changed member */ );
1857           ip0->checksum = ip_csum_fold (sum0);
1858
1859           if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1860             {
1861               if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1862                 {
1863                   old_port0 = tcp0->src_port;
1864                   tcp0->src_port = s0->out2in.port;
1865                   new_port0 = tcp0->src_port;
1866
1867                   sum0 = tcp0->checksum;
1868                   sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1869                                          ip4_header_t,
1870                                          dst_address /* changed member */ );
1871                   sum0 = ip_csum_update (sum0, old_port0, new_port0,
1872                                          ip4_header_t /* cheat */ ,
1873                                          length /* changed member */ );
1874                   tcp0->checksum = ip_csum_fold (sum0);
1875                 }
1876               else
1877                 {
1878                   old_port0 = udp0->src_port;
1879                   udp0->src_port = s0->out2in.port;
1880                   udp0->checksum = 0;
1881                 }
1882             }
1883
1884           /* Hairpinning */
1885           nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port,
1886                                    s0->ext_host_port, proto0, 0);
1887
1888           /* Accounting */
1889           nat44_session_update_counters (s0, now,
1890                                          vlib_buffer_length_in_chain (vm,
1891                                                                       b0));
1892           /* Per-user LRU list maintenance */
1893           nat44_session_update_lru (sm, s0, thread_index);
1894
1895         trace0:
1896           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1897                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1898             {
1899               nat44_reass_trace_t *t =
1900                 vlib_add_trace (vm, node, b0, sizeof (*t));
1901               t->cached = cached0;
1902               t->sw_if_index = sw_if_index0;
1903               t->next_index = next0;
1904             }
1905
1906           if (cached0)
1907             {
1908               n_left_to_next++;
1909               to_next--;
1910               cached_fragments++;
1911             }
1912           else
1913             {
1914               pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
1915
1916               /* verify speculative enqueue, maybe switch current next frame */
1917               vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1918                                                to_next, n_left_to_next,
1919                                                bi0, next0);
1920             }
1921
1922           if (n_left_from == 0 && vec_len (fragments_to_loopback))
1923             {
1924               from = vlib_frame_vector_args (frame);
1925               u32 len = vec_len (fragments_to_loopback);
1926               if (len <= VLIB_FRAME_SIZE)
1927                 {
1928                   clib_memcpy_fast (from, fragments_to_loopback,
1929                                     sizeof (u32) * len);
1930                   n_left_from = len;
1931                   vec_reset_length (fragments_to_loopback);
1932                 }
1933               else
1934                 {
1935                   clib_memcpy_fast (from, fragments_to_loopback +
1936                                     (len - VLIB_FRAME_SIZE),
1937                                     sizeof (u32) * VLIB_FRAME_SIZE);
1938                   n_left_from = VLIB_FRAME_SIZE;
1939                   _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
1940                 }
1941             }
1942         }
1943
1944       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1945     }
1946
1947   vlib_node_increment_counter (vm, sm->in2out_reass_node_index,
1948                                SNAT_IN2OUT_ERROR_PROCESSED_FRAGMENTS,
1949                                pkts_processed);
1950   vlib_node_increment_counter (vm, sm->in2out_reass_node_index,
1951                                SNAT_IN2OUT_ERROR_CACHED_FRAGMENTS,
1952                                cached_fragments);
1953
1954   nat_send_all_to_node (vm, fragments_to_drop, node,
1955                         &node->errors[SNAT_IN2OUT_ERROR_DROP_FRAGMENT],
1956                         SNAT_IN2OUT_NEXT_DROP);
1957
1958   vec_free (fragments_to_drop);
1959   vec_free (fragments_to_loopback);
1960   return frame->n_vectors;
1961 }
1962
1963 /* *INDENT-OFF* */
1964 VLIB_REGISTER_NODE (nat44_in2out_reass_node) = {
1965   .name = "nat44-in2out-reass",
1966   .vector_size = sizeof (u32),
1967   .format_trace = format_nat44_reass_trace,
1968   .type = VLIB_NODE_TYPE_INTERNAL,
1969
1970   .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1971   .error_strings = snat_in2out_error_strings,
1972
1973   .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1974   .next_nodes = {
1975     [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1976     [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1977     [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
1978     [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1979     [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
1980   },
1981 };
1982 /* *INDENT-ON* */
1983
1984 VLIB_NODE_FN (snat_in2out_fast_node) (vlib_main_t * vm,
1985                                       vlib_node_runtime_t * node,
1986                                       vlib_frame_t * frame)
1987 {
1988   u32 n_left_from, *from, *to_next;
1989   snat_in2out_next_t next_index;
1990   u32 pkts_processed = 0;
1991   snat_main_t *sm = &snat_main;
1992   u32 stats_node_index;
1993
1994   stats_node_index = sm->in2out_fast_node_index;
1995
1996   from = vlib_frame_vector_args (frame);
1997   n_left_from = frame->n_vectors;
1998   next_index = node->cached_next_index;
1999
2000   while (n_left_from > 0)
2001     {
2002       u32 n_left_to_next;
2003
2004       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2005
2006       while (n_left_from > 0 && n_left_to_next > 0)
2007         {
2008           u32 bi0;
2009           vlib_buffer_t *b0;
2010           u32 next0;
2011           u32 sw_if_index0;
2012           ip4_header_t *ip0;
2013           ip_csum_t sum0;
2014           u32 new_addr0, old_addr0;
2015           u16 old_port0, new_port0;
2016           udp_header_t *udp0;
2017           tcp_header_t *tcp0;
2018           icmp46_header_t *icmp0;
2019           snat_session_key_t key0, sm0;
2020           u32 proto0;
2021           u32 rx_fib_index0;
2022
2023           /* speculatively enqueue b0 to the current next frame */
2024           bi0 = from[0];
2025           to_next[0] = bi0;
2026           from += 1;
2027           to_next += 1;
2028           n_left_from -= 1;
2029           n_left_to_next -= 1;
2030
2031           b0 = vlib_get_buffer (vm, bi0);
2032           next0 = SNAT_IN2OUT_NEXT_LOOKUP;
2033
2034           ip0 = vlib_buffer_get_current (b0);
2035           udp0 = ip4_next_header (ip0);
2036           tcp0 = (tcp_header_t *) udp0;
2037           icmp0 = (icmp46_header_t *) udp0;
2038
2039           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
2040           rx_fib_index0 =
2041             ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
2042
2043           if (PREDICT_FALSE (ip0->ttl == 1))
2044             {
2045               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2046               icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
2047                                            ICMP4_time_exceeded_ttl_exceeded_in_transit,
2048                                            0);
2049               next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
2050               goto trace0;
2051             }
2052
2053           proto0 = ip_proto_to_snat_proto (ip0->protocol);
2054
2055           if (PREDICT_FALSE (proto0 == ~0))
2056             goto trace0;
2057
2058           if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
2059             {
2060               next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0,
2061                                    rx_fib_index0, node, next0, ~0, 0, 0);
2062               goto trace0;
2063             }
2064
2065           key0.addr = ip0->src_address;
2066           key0.protocol = proto0;
2067           key0.port = udp0->src_port;
2068           key0.fib_index = rx_fib_index0;
2069
2070           if (snat_static_mapping_match (sm, key0, &sm0, 0, 0, 0, 0, 0, 0))
2071             {
2072               b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
2073               next0 = SNAT_IN2OUT_NEXT_DROP;
2074               goto trace0;
2075             }
2076
2077           new_addr0 = sm0.addr.as_u32;
2078           new_port0 = sm0.port;
2079           vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
2080           old_addr0 = ip0->src_address.as_u32;
2081           ip0->src_address.as_u32 = new_addr0;
2082
2083           sum0 = ip0->checksum;
2084           sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
2085                                  ip4_header_t,
2086                                  src_address /* changed member */ );
2087           ip0->checksum = ip_csum_fold (sum0);
2088
2089           if (PREDICT_FALSE (new_port0 != udp0->dst_port))
2090             {
2091               if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
2092                 {
2093                   old_port0 = tcp0->src_port;
2094                   tcp0->src_port = new_port0;
2095
2096                   sum0 = tcp0->checksum;
2097                   sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
2098                                          ip4_header_t,
2099                                          dst_address /* changed member */ );
2100                   sum0 = ip_csum_update (sum0, old_port0, new_port0,
2101                                          ip4_header_t /* cheat */ ,
2102                                          length /* changed member */ );
2103                   mss_clamping (sm, tcp0, &sum0);
2104                   tcp0->checksum = ip_csum_fold (sum0);
2105                 }
2106               else
2107                 {
2108                   old_port0 = udp0->src_port;
2109                   udp0->src_port = new_port0;
2110                   udp0->checksum = 0;
2111                 }
2112             }
2113           else
2114             {
2115               if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
2116                 {
2117                   sum0 = tcp0->checksum;
2118                   sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
2119                                          ip4_header_t,
2120                                          dst_address /* changed member */ );
2121                   mss_clamping (sm, tcp0, &sum0);
2122                   tcp0->checksum = ip_csum_fold (sum0);
2123                 }
2124             }
2125
2126           /* Hairpinning */
2127           snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0, 0);
2128
2129         trace0:
2130           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
2131                              && (b0->flags & VLIB_BUFFER_IS_TRACED)))
2132             {
2133               snat_in2out_trace_t *t =
2134                 vlib_add_trace (vm, node, b0, sizeof (*t));
2135               t->sw_if_index = sw_if_index0;
2136               t->next_index = next0;
2137             }
2138
2139           pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
2140
2141           /* verify speculative enqueue, maybe switch current next frame */
2142           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2143                                            to_next, n_left_to_next,
2144                                            bi0, next0);
2145         }
2146
2147       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2148     }
2149
2150   vlib_node_increment_counter (vm, stats_node_index,
2151                                SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
2152                                pkts_processed);
2153   return frame->n_vectors;
2154 }
2155
2156
2157 /* *INDENT-OFF* */
2158 VLIB_REGISTER_NODE (snat_in2out_fast_node) = {
2159   .name = "nat44-in2out-fast",
2160   .vector_size = sizeof (u32),
2161   .format_trace = format_snat_in2out_fast_trace,
2162   .type = VLIB_NODE_TYPE_INTERNAL,
2163
2164   .n_errors = ARRAY_LEN(snat_in2out_error_strings),
2165   .error_strings = snat_in2out_error_strings,
2166
2167   .runtime_data_bytes = sizeof (snat_runtime_t),
2168
2169   .n_next_nodes = SNAT_IN2OUT_N_NEXT,
2170
2171   /* edit / add dispositions here */
2172   .next_nodes = {
2173     [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
2174     [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
2175     [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
2176     [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2177     [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
2178   },
2179 };
2180 /* *INDENT-ON* */
2181
2182 /*
2183  * fd.io coding-style-patch-verification: ON
2184  *
2185  * Local Variables:
2186  * eval: (c-set-style "gnu")
2187  * End:
2188  */