FD.io VPP  v19.04.4-rc0-5-ge88582fac
Vector Packet Processing
in2out.c
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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 #include <nat/nat_ha.h>
33 
34 #include <vppinfra/hash.h>
35 #include <vppinfra/error.h>
36 #include <vppinfra/elog.h>
37 
38 typedef struct
39 {
45 
46 /* packet trace format function */
47 static u8 *
48 format_snat_in2out_trace (u8 * s, va_list * args)
49 {
50  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
51  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
52  snat_in2out_trace_t *t = va_arg (*args, snat_in2out_trace_t *);
53  char *tag;
54 
55  tag = t->is_slow_path ? "NAT44_IN2OUT_SLOW_PATH" : "NAT44_IN2OUT_FAST_PATH";
56 
57  s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
59 
60  return s;
61 }
62 
63 static u8 *
64 format_snat_in2out_fast_trace (u8 * s, va_list * args)
65 {
66  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
67  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
68  snat_in2out_trace_t *t = va_arg (*args, snat_in2out_trace_t *);
69 
70  s = format (s, "NAT44_IN2OUT_FAST: sw_if_index %d, next index %d",
71  t->sw_if_index, t->next_index);
72 
73  return s;
74 }
75 
76 #define foreach_snat_in2out_error \
77 _(UNSUPPORTED_PROTOCOL, "unsupported protocol") \
78 _(IN2OUT_PACKETS, "good in2out packets processed") \
79 _(OUT_OF_PORTS, "out of ports") \
80 _(BAD_OUTSIDE_FIB, "outside VRF ID not found") \
81 _(BAD_ICMP_TYPE, "unsupported ICMP type") \
82 _(NO_TRANSLATION, "no translation") \
83 _(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \
84 _(DROP_FRAGMENT, "drop fragment") \
85 _(MAX_REASS, "maximum reassemblies exceeded") \
86 _(MAX_FRAG, "maximum fragments per reassembly exceeded")\
87 _(TCP_PACKETS, "TCP packets") \
88 _(UDP_PACKETS, "UDP packets") \
89 _(ICMP_PACKETS, "ICMP packets") \
90 _(OTHER_PACKETS, "other protocol packets") \
91 _(FRAGMENTS, "fragments") \
92 _(CACHED_FRAGMENTS, "cached fragments") \
93 _(PROCESSED_FRAGMENTS, "processed fragments")
94 
95 typedef enum
96 {
97 #define _(sym,str) SNAT_IN2OUT_ERROR_##sym,
99 #undef _
102 
103 static char *snat_in2out_error_strings[] = {
104 #define _(sym,string) string,
106 #undef _
107 };
108 
109 typedef enum
110 {
118 
119 static inline int
121  u32 sw_if_index0, ip4_header_t * ip0, u32 proto0,
122  u32 rx_fib_index0, u32 thread_index)
123 {
124  udp_header_t *udp0 = ip4_next_header (ip0);
125  snat_session_key_t key0, sm0;
126  clib_bihash_kv_8_8_t kv0, value0;
127 
128  key0.addr = ip0->dst_address;
129  key0.port = udp0->dst_port;
130  key0.protocol = proto0;
131  key0.fib_index = sm->outside_fib_index;
132  kv0.key = key0.as_u64;
133 
134  /* NAT packet aimed at external address if */
135  /* has active sessions */
136  if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0,
137  &value0))
138  {
139  /* or is static mappings */
140  if (!snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0, 0))
141  return 0;
142  }
143  else
144  return 0;
145 
146  if (sm->forwarding_enabled)
147  return 1;
148 
149  return snat_not_translate_fast (sm, node, sw_if_index0, ip0, proto0,
150  rx_fib_index0);
151 }
152 
153 static inline int
155  u32 proto0, u16 src_port, u16 dst_port,
156  u32 thread_index, u32 sw_if_index)
157 {
158  snat_session_key_t key0;
159  clib_bihash_kv_8_8_t kv0, value0;
161 
162  /* src NAT check */
163  key0.addr = ip0->src_address;
164  key0.port = src_port;
165  key0.protocol = proto0;
167  kv0.key = key0.as_u64;
168 
169  if (!clib_bihash_search_8_8
170  (&sm->per_thread_data[thread_index].out2in, &kv0, &value0))
171  return 1;
172 
173  /* dst NAT check */
174  key0.addr = ip0->dst_address;
175  key0.port = dst_port;
176  key0.protocol = proto0;
177  kv0.key = key0.as_u64;
178  if (!clib_bihash_search_8_8
179  (&sm->per_thread_data[thread_index].in2out, &kv0, &value0))
180  {
181  /* hairpinning */
182  /* *INDENT-OFF* */
184  ({
185  if ((nat_interface_is_inside(i)) && (sw_if_index == i->sw_if_index))
186  return 0;
187  }));
188  /* *INDENT-ON* */
189  return 1;
190  }
191 
192  return 0;
193 }
194 
195 #ifndef CLIB_MARCH_VARIANT
196 int
198 {
199  snat_main_t *sm = &snat_main;
201  snat_session_t *s;
202  u64 sess_timeout_time;
204  ctx->thread_index);
206 
207  s = pool_elt_at_index (tsm->sessions, kv->value);
208  sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
209  if (ctx->now >= sess_timeout_time)
210  {
211  s_kv.key = s->out2in.as_u64;
212  if (clib_bihash_add_del_8_8 (&tsm->out2in, &s_kv, 0))
213  nat_log_warn ("out2in key del failed");
214 
216  s->in2out.addr.as_u32,
217  s->out2in.addr.as_u32,
218  s->in2out.protocol,
219  s->in2out.port,
220  s->out2in.port,
221  s->in2out.fib_index);
222 
223  nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
224  &s->in2out.addr, s->in2out.port,
225  &s->out2in.addr, s->out2in.port,
226  s->in2out.protocol);
227 
228  nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
229  s->ext_host_port, s->out2in.protocol, s->out2in.fib_index,
230  ctx->thread_index);
231 
232  if (!snat_is_session_static (s))
234  &s->out2in);
235 
236  nat44_delete_session (sm, s, ctx->thread_index);
237  return 1;
238  }
239 
240  return 0;
241 }
242 #endif
243 
244 static u32
246  ip4_header_t * ip0,
247  u32 rx_fib_index0,
248  snat_session_key_t * key0,
249  snat_session_t ** sessionp,
250  vlib_node_runtime_t * node, u32 next0, u32 thread_index, f64 now)
251 {
252  snat_user_t *u;
253  snat_session_t *s = 0;
255  snat_session_key_t key1;
256  udp_header_t *udp0 = ip4_next_header (ip0);
257  u8 is_sm = 0;
258  nat_outside_fib_t *outside_fib;
260  u8 identity_nat;
261  fib_prefix_t pfx = {
263  .fp_len = 32,
264  .fp_addr = {
265  .ip4.as_u32 = ip0->dst_address.as_u32,
266  },
267  };
269 
270  if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
271  {
272  b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED];
274  nat_log_notice ("maximum sessions exceeded");
275  return SNAT_IN2OUT_NEXT_DROP;
276  }
277 
278  key1.protocol = key0->protocol;
279 
280  /* First try to match static mapping by local address and port */
282  (sm, *key0, &key1, 0, 0, 0, 0, 0, &identity_nat))
283  {
284  /* Try to create dynamic translation */
285  if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index0,
286  thread_index, &key1,
287  sm->port_per_thread,
288  sm->per_thread_data
289  [thread_index].snat_thread_index))
290  {
291  b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
292  return SNAT_IN2OUT_NEXT_DROP;
293  }
294  }
295  else
296  {
297  if (PREDICT_FALSE (identity_nat))
298  {
299  *sessionp = s;
300  return next0;
301  }
302 
303  is_sm = 1;
304  }
305 
306  u = nat_user_get_or_create (sm, &ip0->src_address, rx_fib_index0,
307  thread_index);
308  if (!u)
309  {
310  nat_log_warn ("create NAT user failed");
311  return SNAT_IN2OUT_NEXT_DROP;
312  }
313 
314  s = nat_session_alloc_or_recycle (sm, u, thread_index, now);
315  if (!s)
316  {
317  nat44_delete_user_with_no_session (sm, u, thread_index);
318  nat_log_warn ("create NAT session failed");
319  return SNAT_IN2OUT_NEXT_DROP;
320  }
321 
322  if (is_sm)
324  user_session_increment (sm, u, is_sm);
325  s->in2out = *key0;
326  s->out2in = key1;
327  s->out2in.protocol = key0->protocol;
328  s->out2in.fib_index = sm->outside_fib_index;
329  switch (vec_len (sm->outside_fibs))
330  {
331  case 0:
332  s->out2in.fib_index = sm->outside_fib_index;
333  break;
334  case 1:
335  s->out2in.fib_index = sm->outside_fibs[0].fib_index;
336  break;
337  default:
338  /* *INDENT-OFF* */
339  vec_foreach (outside_fib, sm->outside_fibs)
340  {
341  fei = fib_table_lookup (outside_fib->fib_index, &pfx);
342  if (FIB_NODE_INDEX_INVALID != fei)
343  {
344  if (fib_entry_get_resolving_interface (fei) != ~0)
345  {
346  s->out2in.fib_index = outside_fib->fib_index;
347  break;
348  }
349  }
350  }
351  /* *INDENT-ON* */
352  break;
353  }
354  s->ext_host_addr.as_u32 = ip0->dst_address.as_u32;
355  s->ext_host_port = udp0->dst_port;
356  *sessionp = s;
357 
358  /* Add to translation hashes */
359  ctx0.now = now;
360  ctx0.thread_index = thread_index;
361  kv0.key = s->in2out.as_u64;
362  kv0.value = s - sm->per_thread_data[thread_index].sessions;
363  if (clib_bihash_add_or_overwrite_stale_8_8
364  (&sm->per_thread_data[thread_index].in2out, &kv0,
366  nat_log_notice ("in2out key add failed");
367 
368  kv0.key = s->out2in.as_u64;
369  kv0.value = s - sm->per_thread_data[thread_index].sessions;
370 
371  if (clib_bihash_add_or_overwrite_stale_8_8
372  (&sm->per_thread_data[thread_index].out2in, &kv0,
374  nat_log_notice ("out2in key add failed");
375 
376  /* log NAT event */
378  s->in2out.addr.as_u32,
379  s->out2in.addr.as_u32,
380  s->in2out.protocol,
381  s->in2out.port,
382  s->out2in.port, s->in2out.fib_index);
383 
384  nat_syslog_nat44_apmadd (s->user_index, s->in2out.fib_index,
385  &s->in2out.addr, s->in2out.port, &s->out2in.addr,
386  s->out2in.port, s->in2out.protocol);
387 
388  nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
389  s->out2in.port, &s->ext_host_addr, s->ext_host_port,
390  &s->ext_host_nat_addr, s->ext_host_nat_port,
391  s->in2out.protocol, s->in2out.fib_index, s->flags,
392  thread_index, 0);
393 
394  return next0;
395 }
396 
397 #ifndef CLIB_MARCH_VARIANT
400  snat_session_key_t * p_key0)
401 {
402  icmp46_header_t *icmp0;
403  snat_session_key_t key0;
404  icmp_echo_header_t *echo0, *inner_echo0 = 0;
405  ip4_header_t *inner_ip0 = 0;
406  void *l4_header = 0;
407  icmp46_header_t *inner_icmp0;
408 
409  icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
410  echo0 = (icmp_echo_header_t *) (icmp0 + 1);
411 
412  if (!icmp_is_error_message (icmp0))
413  {
414  key0.protocol = SNAT_PROTOCOL_ICMP;
415  key0.addr = ip0->src_address;
416  key0.port = echo0->identifier;
417  }
418  else
419  {
420  inner_ip0 = (ip4_header_t *) (echo0 + 1);
421  l4_header = ip4_next_header (inner_ip0);
422  key0.protocol = ip_proto_to_snat_proto (inner_ip0->protocol);
423  key0.addr = inner_ip0->dst_address;
424  switch (key0.protocol)
425  {
426  case SNAT_PROTOCOL_ICMP:
427  inner_icmp0 = (icmp46_header_t *) l4_header;
428  inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
429  key0.port = inner_echo0->identifier;
430  break;
431  case SNAT_PROTOCOL_UDP:
432  case SNAT_PROTOCOL_TCP:
433  key0.port = ((tcp_udp_header_t *) l4_header)->dst_port;
434  break;
435  default:
436  return SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL;
437  }
438  }
439  *p_key0 = key0;
440  return -1; /* success */
441 }
442 
443 /**
444  * Get address and port values to be used for ICMP packet translation
445  * and create session if needed
446  *
447  * @param[in,out] sm NAT main
448  * @param[in,out] node NAT node runtime
449  * @param[in] thread_index thread index
450  * @param[in,out] b0 buffer containing packet to be translated
451  * @param[out] p_proto protocol used for matching
452  * @param[out] p_value address and port after NAT translation
453  * @param[out] p_dont_translate if packet should not be translated
454  * @param d optional parameter
455  * @param e optional parameter
456  */
457 u32
459  u32 thread_index, vlib_buffer_t * b0,
460  ip4_header_t * ip0, u8 * p_proto,
461  snat_session_key_t * p_value,
462  u8 * p_dont_translate, void *d, void *e)
463 {
464  icmp46_header_t *icmp0;
465  u32 sw_if_index0;
466  u32 rx_fib_index0;
467  snat_session_key_t key0;
468  snat_session_t *s0 = 0;
469  u8 dont_translate = 0;
470  clib_bihash_kv_8_8_t kv0, value0;
471  u32 next0 = ~0;
472  int err;
473 
474  icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
475  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
476  rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
477 
478  err = icmp_get_key (ip0, &key0);
479  if (err != -1)
480  {
481  b0->error = node->errors[err];
482  next0 = SNAT_IN2OUT_NEXT_DROP;
483  goto out;
484  }
485  key0.fib_index = rx_fib_index0;
486 
487  kv0.key = key0.as_u64;
488 
489  if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].in2out, &kv0,
490  &value0))
491  {
492  if (vnet_buffer (b0)->sw_if_index[VLIB_TX] != ~0)
493  {
495  key0.protocol,
496  key0.port,
497  key0.port,
498  thread_index,
499  sw_if_index0)))
500  {
501  dont_translate = 1;
502  goto out;
503  }
504  }
505  else
506  {
507  if (PREDICT_FALSE (snat_not_translate (sm, node, sw_if_index0,
508  ip0, SNAT_PROTOCOL_ICMP,
509  rx_fib_index0,
510  thread_index)))
511  {
512  dont_translate = 1;
513  goto out;
514  }
515  }
516 
517  if (PREDICT_FALSE (icmp_is_error_message (icmp0)))
518  {
519  b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
520  next0 = SNAT_IN2OUT_NEXT_DROP;
521  goto out;
522  }
523 
524  next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, &s0, node, next0,
525  thread_index, vlib_time_now (sm->vlib_main));
526 
527  if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
528  goto out;
529 
530  if (!s0)
531  {
532  dont_translate = 1;
533  goto out;
534  }
535  }
536  else
537  {
538  if (PREDICT_FALSE (icmp0->type != ICMP4_echo_request &&
539  icmp0->type != ICMP4_echo_reply &&
540  !icmp_is_error_message (icmp0)))
541  {
542  b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
543  next0 = SNAT_IN2OUT_NEXT_DROP;
544  goto out;
545  }
546 
547  s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
548  value0.value);
549  }
550 
551 out:
552  *p_proto = key0.protocol;
553  if (s0)
554  *p_value = s0->out2in;
555  *p_dont_translate = dont_translate;
556  if (d)
557  *(snat_session_t **) d = s0;
558  return next0;
559 }
560 #endif
561 
562 #ifndef CLIB_MARCH_VARIANT
563 /**
564  * Get address and port values to be used for ICMP packet translation
565  *
566  * @param[in] sm NAT main
567  * @param[in,out] node NAT node runtime
568  * @param[in] thread_index thread index
569  * @param[in,out] b0 buffer containing packet to be translated
570  * @param[out] p_proto protocol used for matching
571  * @param[out] p_value address and port after NAT translation
572  * @param[out] p_dont_translate if packet should not be translated
573  * @param d optional parameter
574  * @param e optional parameter
575  */
576 u32
578  u32 thread_index, vlib_buffer_t * b0,
579  ip4_header_t * ip0, u8 * p_proto,
580  snat_session_key_t * p_value,
581  u8 * p_dont_translate, void *d, void *e)
582 {
583  icmp46_header_t *icmp0;
584  u32 sw_if_index0;
585  u32 rx_fib_index0;
586  snat_session_key_t key0;
587  snat_session_key_t sm0;
588  u8 dont_translate = 0;
589  u8 is_addr_only;
590  u32 next0 = ~0;
591  int err;
592 
593  icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
594  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
595  rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
596 
597  err = icmp_get_key (ip0, &key0);
598  if (err != -1)
599  {
600  b0->error = node->errors[err];
601  next0 = SNAT_IN2OUT_NEXT_DROP;
602  goto out2;
603  }
604  key0.fib_index = rx_fib_index0;
605 
607  (sm, key0, &sm0, 0, &is_addr_only, 0, 0, 0, 0))
608  {
609  if (PREDICT_FALSE (snat_not_translate_fast (sm, node, sw_if_index0, ip0,
610  IP_PROTOCOL_ICMP,
611  rx_fib_index0)))
612  {
613  dont_translate = 1;
614  goto out;
615  }
616 
617  if (icmp_is_error_message (icmp0))
618  {
619  next0 = SNAT_IN2OUT_NEXT_DROP;
620  goto out;
621  }
622 
623  b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
624  next0 = SNAT_IN2OUT_NEXT_DROP;
625  goto out;
626  }
627 
628  if (PREDICT_FALSE (icmp0->type != ICMP4_echo_request &&
629  (icmp0->type != ICMP4_echo_reply || !is_addr_only) &&
630  !icmp_is_error_message (icmp0)))
631  {
632  b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
633  next0 = SNAT_IN2OUT_NEXT_DROP;
634  goto out;
635  }
636 
637 out:
638  *p_value = sm0;
639 out2:
640  *p_proto = key0.protocol;
641  *p_dont_translate = dont_translate;
642  return next0;
643 }
644 #endif
645 
646 #ifndef CLIB_MARCH_VARIANT
647 u32
649  vlib_buffer_t * b0,
650  ip4_header_t * ip0,
651  icmp46_header_t * icmp0,
652  u32 sw_if_index0,
653  u32 rx_fib_index0,
654  vlib_node_runtime_t * node,
655  u32 next0, u32 thread_index, void *d, void *e)
656 {
657  snat_session_key_t sm0;
658  u8 protocol;
659  icmp_echo_header_t *echo0, *inner_echo0 = 0;
660  ip4_header_t *inner_ip0;
661  void *l4_header = 0;
662  icmp46_header_t *inner_icmp0;
663  u8 dont_translate;
664  u32 new_addr0, old_addr0;
665  u16 old_id0, new_id0;
666  u16 old_checksum0, new_checksum0;
667  ip_csum_t sum0;
668  u16 checksum0;
669  u32 next0_tmp;
670 
671  echo0 = (icmp_echo_header_t *) (icmp0 + 1);
672 
673  next0_tmp = sm->icmp_match_in2out_cb (sm, node, thread_index, b0, ip0,
674  &protocol, &sm0, &dont_translate, d,
675  e);
676  if (next0_tmp != ~0)
677  next0 = next0_tmp;
678  if (next0 == SNAT_IN2OUT_NEXT_DROP || dont_translate)
679  goto out;
680 
681  if (PREDICT_TRUE (!ip4_is_fragment (ip0)))
682  {
683  sum0 = ip_incremental_checksum_buffer (sm->vlib_main, b0, (u8 *) icmp0 -
684  (u8 *)
686  ntohs (ip0->length) -
687  ip4_header_bytes (ip0), 0);
688  checksum0 = ~ip_csum_fold (sum0);
689  if (PREDICT_FALSE (checksum0 != 0 && checksum0 != 0xffff))
690  {
691  next0 = SNAT_IN2OUT_NEXT_DROP;
692  goto out;
693  }
694  }
695 
696  old_addr0 = ip0->src_address.as_u32;
697  new_addr0 = ip0->src_address.as_u32 = sm0.addr.as_u32;
698 
699  sum0 = ip0->checksum;
700  sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
701  src_address /* changed member */ );
702  ip0->checksum = ip_csum_fold (sum0);
703 
704  if (icmp0->checksum == 0)
705  icmp0->checksum = 0xffff;
706 
707  if (!icmp_is_error_message (icmp0))
708  {
709  new_id0 = sm0.port;
710  if (PREDICT_FALSE (new_id0 != echo0->identifier))
711  {
712  old_id0 = echo0->identifier;
713  new_id0 = sm0.port;
714  echo0->identifier = new_id0;
715 
716  sum0 = icmp0->checksum;
717  sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
718  identifier);
719  icmp0->checksum = ip_csum_fold (sum0);
720  }
721  }
722  else
723  {
724  inner_ip0 = (ip4_header_t *) (echo0 + 1);
725  l4_header = ip4_next_header (inner_ip0);
726 
727  if (!ip4_header_checksum_is_valid (inner_ip0))
728  {
729  next0 = SNAT_IN2OUT_NEXT_DROP;
730  goto out;
731  }
732 
733  /* update inner destination IP address */
734  old_addr0 = inner_ip0->dst_address.as_u32;
735  inner_ip0->dst_address = sm0.addr;
736  new_addr0 = inner_ip0->dst_address.as_u32;
737  sum0 = icmp0->checksum;
738  sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
739  dst_address /* changed member */ );
740  icmp0->checksum = ip_csum_fold (sum0);
741 
742  /* update inner IP header checksum */
743  old_checksum0 = inner_ip0->checksum;
744  sum0 = inner_ip0->checksum;
745  sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
746  dst_address /* changed member */ );
747  inner_ip0->checksum = ip_csum_fold (sum0);
748  new_checksum0 = inner_ip0->checksum;
749  sum0 = icmp0->checksum;
750  sum0 = ip_csum_update (sum0, old_checksum0, new_checksum0, ip4_header_t,
751  checksum);
752  icmp0->checksum = ip_csum_fold (sum0);
753 
754  switch (protocol)
755  {
756  case SNAT_PROTOCOL_ICMP:
757  inner_icmp0 = (icmp46_header_t *) l4_header;
758  inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
759 
760  old_id0 = inner_echo0->identifier;
761  new_id0 = sm0.port;
762  inner_echo0->identifier = new_id0;
763 
764  sum0 = icmp0->checksum;
765  sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
766  identifier);
767  icmp0->checksum = ip_csum_fold (sum0);
768  break;
769  case SNAT_PROTOCOL_UDP:
770  case SNAT_PROTOCOL_TCP:
771  old_id0 = ((tcp_udp_header_t *) l4_header)->dst_port;
772  new_id0 = sm0.port;
773  ((tcp_udp_header_t *) l4_header)->dst_port = new_id0;
774 
775  sum0 = icmp0->checksum;
776  sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t,
777  dst_port);
778  icmp0->checksum = ip_csum_fold (sum0);
779  break;
780  default:
781  ASSERT (0);
782  }
783  }
784 
785  if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0)
786  {
787  if (sm->deterministic ||
788  0 != snat_icmp_hairpinning (sm, b0, ip0, icmp0,
789  sm->endpoint_dependent))
790  vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
791  }
792 
793 out:
794  return next0;
795 }
796 #endif
797 
798 static inline u32
800  vlib_buffer_t * b0,
801  ip4_header_t * ip0,
802  icmp46_header_t * icmp0,
803  u32 sw_if_index0,
804  u32 rx_fib_index0,
805  vlib_node_runtime_t * node,
806  u32 next0,
807  f64 now, u32 thread_index, snat_session_t ** p_s0)
808 {
809  next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
810  next0, thread_index, p_s0, 0);
811  snat_session_t *s0 = *p_s0;
812  if (PREDICT_TRUE (next0 != SNAT_IN2OUT_NEXT_DROP && s0))
813  {
814  /* Accounting */
817  (sm->vlib_main, b0), thread_index);
818  /* Per-user LRU list maintenance */
819  nat44_session_update_lru (sm, s0, thread_index);
820  }
821  return next0;
822 }
823 
824 static int
826  vlib_buffer_t * b,
827  ip4_header_t * ip, u32 rx_fib_index)
828 {
829  clib_bihash_kv_8_8_t kv, value;
831  snat_session_key_t m_key;
832  u32 old_addr, new_addr;
833  ip_csum_t sum;
834 
835  m_key.addr = ip->src_address;
836  m_key.port = 0;
837  m_key.protocol = 0;
838  m_key.fib_index = rx_fib_index;
839  kv.key = m_key.as_u64;
840  if (clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
841  return 1;
842 
843  m = pool_elt_at_index (sm->static_mappings, value.value);
844 
845  old_addr = ip->src_address.as_u32;
846  new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
847  sum = ip->checksum;
848  sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
849  ip->checksum = ip_csum_fold (sum);
850 
851 
852  /* Hairpinning */
853  if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
854  {
855  vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
857  }
858 
859  return 0;
860 }
861 
862 static inline uword
864  vlib_node_runtime_t * node,
865  vlib_frame_t * frame, int is_slow_path,
866  int is_output_feature)
867 {
868  u32 n_left_from, *from, *to_next;
869  snat_in2out_next_t next_index;
870  u32 pkts_processed = 0;
871  snat_main_t *sm = &snat_main;
872  f64 now = vlib_time_now (vm);
873  u32 stats_node_index;
874  u32 thread_index = vm->thread_index;
875  u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
876  0, fragments = 0;
877 
878  stats_node_index = is_slow_path ? sm->in2out_slowpath_node_index :
879  sm->in2out_node_index;
880 
881  from = vlib_frame_vector_args (frame);
882  n_left_from = frame->n_vectors;
883  next_index = node->cached_next_index;
884 
885  while (n_left_from > 0)
886  {
887  u32 n_left_to_next;
888 
889  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
890 
891  while (n_left_from >= 4 && n_left_to_next >= 2)
892  {
893  u32 bi0, bi1;
894  vlib_buffer_t *b0, *b1;
895  u32 next0, next1;
896  u32 sw_if_index0, sw_if_index1;
897  ip4_header_t *ip0, *ip1;
898  ip_csum_t sum0, sum1;
899  u32 new_addr0, old_addr0, new_addr1, old_addr1;
900  u16 old_port0, new_port0, old_port1, new_port1;
901  udp_header_t *udp0, *udp1;
902  tcp_header_t *tcp0, *tcp1;
903  icmp46_header_t *icmp0, *icmp1;
904  snat_session_key_t key0, key1;
905  u32 rx_fib_index0, rx_fib_index1;
906  u32 proto0, proto1;
907  snat_session_t *s0 = 0, *s1 = 0;
908  clib_bihash_kv_8_8_t kv0, value0, kv1, value1;
909  u32 iph_offset0 = 0, iph_offset1 = 0;
910 
911  /* Prefetch next iteration. */
912  {
913  vlib_buffer_t *p2, *p3;
914 
915  p2 = vlib_get_buffer (vm, from[2]);
916  p3 = vlib_get_buffer (vm, from[3]);
917 
918  vlib_prefetch_buffer_header (p2, LOAD);
919  vlib_prefetch_buffer_header (p3, LOAD);
920 
923  }
924 
925  /* speculatively enqueue b0 and b1 to the current next frame */
926  to_next[0] = bi0 = from[0];
927  to_next[1] = bi1 = from[1];
928  from += 2;
929  to_next += 2;
930  n_left_from -= 2;
931  n_left_to_next -= 2;
932 
933  b0 = vlib_get_buffer (vm, bi0);
934  b1 = vlib_get_buffer (vm, bi1);
935 
936  if (is_output_feature)
937  iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
938 
939  ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
940  iph_offset0);
941 
942  udp0 = ip4_next_header (ip0);
943  tcp0 = (tcp_header_t *) udp0;
944  icmp0 = (icmp46_header_t *) udp0;
945 
946  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
947  rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
948  sw_if_index0);
949 
950  next0 = next1 = SNAT_IN2OUT_NEXT_LOOKUP;
951 
952  if (PREDICT_FALSE (ip0->ttl == 1))
953  {
954  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
955  icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
956  ICMP4_time_exceeded_ttl_exceeded_in_transit,
957  0);
959  goto trace00;
960  }
961 
962  proto0 = ip_proto_to_snat_proto (ip0->protocol);
963 
964  /* Next configured feature, probably ip4-lookup */
965  if (is_slow_path)
966  {
967  if (PREDICT_FALSE (proto0 == ~0))
968  {
970  (sm, b0, ip0, rx_fib_index0))
971  {
972  next0 = SNAT_IN2OUT_NEXT_DROP;
973  b0->error =
974  node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
975  }
976  other_packets++;
977  goto trace00;
978  }
979 
980  if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
981  {
982  next0 = icmp_in2out_slow_path
983  (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0,
984  node, next0, now, thread_index, &s0);
985  icmp_packets++;
986  goto trace00;
987  }
988  }
989  else
990  {
991  if (PREDICT_FALSE (proto0 == ~0))
992  {
994  goto trace00;
995  }
996 
997  if (ip4_is_fragment (ip0))
998  {
999  next0 = SNAT_IN2OUT_NEXT_REASS;
1000  fragments++;
1001  goto trace00;
1002  }
1003 
1004  if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1005  {
1007  goto trace00;
1008  }
1009  }
1010 
1011  key0.addr = ip0->src_address;
1012  key0.port = udp0->src_port;
1013  key0.protocol = proto0;
1014  key0.fib_index = rx_fib_index0;
1015 
1016  kv0.key = key0.as_u64;
1017 
1018  if (PREDICT_FALSE
1019  (clib_bihash_search_8_8
1020  (&sm->per_thread_data[thread_index].in2out, &kv0,
1021  &value0) != 0))
1022  {
1023  if (is_slow_path)
1024  {
1025  if (is_output_feature)
1026  {
1028  ip0,
1029  proto0,
1030  udp0->src_port,
1031  udp0->dst_port,
1032  thread_index,
1033  sw_if_index0)))
1034  goto trace00;
1035  }
1036  else
1037  {
1038  if (PREDICT_FALSE
1040  (sm, node, sw_if_index0, ip0, proto0,
1041  rx_fib_index0, thread_index)))
1042  goto trace00;
1043  }
1044 
1045  next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
1046  &s0, node, next0, thread_index, now);
1047  if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
1048  goto trace00;
1049 
1050  if (PREDICT_FALSE (!s0))
1051  goto trace00;
1052  }
1053  else
1054  {
1056  goto trace00;
1057  }
1058  }
1059  else
1060  s0 =
1061  pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1062  value0.value);
1063 
1064  b0->flags |= VNET_BUFFER_F_IS_NATED;
1065 
1066  old_addr0 = ip0->src_address.as_u32;
1067  ip0->src_address = s0->out2in.addr;
1068  new_addr0 = ip0->src_address.as_u32;
1069  if (!is_output_feature)
1070  vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1071 
1072  sum0 = ip0->checksum;
1073  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1074  ip4_header_t,
1075  src_address /* changed member */ );
1076  ip0->checksum = ip_csum_fold (sum0);
1077 
1078  if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1079  {
1080  old_port0 = tcp0->src_port;
1081  tcp0->src_port = s0->out2in.port;
1082  new_port0 = tcp0->src_port;
1083 
1084  sum0 = tcp0->checksum;
1085  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1086  ip4_header_t,
1087  dst_address /* changed member */ );
1088  sum0 = ip_csum_update (sum0, old_port0, new_port0,
1089  ip4_header_t /* cheat */ ,
1090  length /* changed member */ );
1091  mss_clamping (sm, tcp0, &sum0);
1092  tcp0->checksum = ip_csum_fold (sum0);
1093  tcp_packets++;
1094  }
1095  else
1096  {
1097  old_port0 = udp0->src_port;
1098  udp0->src_port = s0->out2in.port;
1099  udp0->checksum = 0;
1100  udp_packets++;
1101  }
1102 
1103  /* Accounting */
1105  vlib_buffer_length_in_chain (vm, b0),
1106  thread_index);
1107  /* Per-user LRU list maintenance */
1108  nat44_session_update_lru (sm, s0, thread_index);
1109  trace00:
1110 
1112  && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1113  {
1114  snat_in2out_trace_t *t =
1115  vlib_add_trace (vm, node, b0, sizeof (*t));
1116  t->is_slow_path = is_slow_path;
1117  t->sw_if_index = sw_if_index0;
1118  t->next_index = next0;
1119  t->session_index = ~0;
1120  if (s0)
1121  t->session_index =
1122  s0 - sm->per_thread_data[thread_index].sessions;
1123  }
1124 
1125  pkts_processed += next0 == SNAT_IN2OUT_NEXT_LOOKUP;
1126 
1127  if (is_output_feature)
1128  iph_offset1 = vnet_buffer (b1)->ip.save_rewrite_length;
1129 
1130  ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
1131  iph_offset1);
1132 
1133  udp1 = ip4_next_header (ip1);
1134  tcp1 = (tcp_header_t *) udp1;
1135  icmp1 = (icmp46_header_t *) udp1;
1136 
1137  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
1138  rx_fib_index1 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
1139  sw_if_index1);
1140 
1141  if (PREDICT_FALSE (ip1->ttl == 1))
1142  {
1143  vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1144  icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
1145  ICMP4_time_exceeded_ttl_exceeded_in_transit,
1146  0);
1148  goto trace01;
1149  }
1150 
1151  proto1 = ip_proto_to_snat_proto (ip1->protocol);
1152 
1153  /* Next configured feature, probably ip4-lookup */
1154  if (is_slow_path)
1155  {
1156  if (PREDICT_FALSE (proto1 == ~0))
1157  {
1159  (sm, b1, ip1, rx_fib_index1))
1160  {
1161  next1 = SNAT_IN2OUT_NEXT_DROP;
1162  b1->error =
1163  node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
1164  }
1165  other_packets++;
1166  goto trace01;
1167  }
1168 
1169  if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1170  {
1171  next1 = icmp_in2out_slow_path
1172  (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
1173  next1, now, thread_index, &s1);
1174  icmp_packets++;
1175  goto trace01;
1176  }
1177  }
1178  else
1179  {
1180  if (PREDICT_FALSE (proto1 == ~0))
1181  {
1183  goto trace01;
1184  }
1185 
1186  if (ip4_is_fragment (ip1))
1187  {
1188  next1 = SNAT_IN2OUT_NEXT_REASS;
1189  fragments++;
1190  goto trace01;
1191  }
1192 
1193  if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1194  {
1196  goto trace01;
1197  }
1198  }
1199 
1200  key1.addr = ip1->src_address;
1201  key1.port = udp1->src_port;
1202  key1.protocol = proto1;
1203  key1.fib_index = rx_fib_index1;
1204 
1205  kv1.key = key1.as_u64;
1206 
1207  if (PREDICT_FALSE
1208  (clib_bihash_search_8_8
1209  (&sm->per_thread_data[thread_index].in2out, &kv1,
1210  &value1) != 0))
1211  {
1212  if (is_slow_path)
1213  {
1214  if (is_output_feature)
1215  {
1217  ip1,
1218  proto1,
1219  udp1->src_port,
1220  udp1->dst_port,
1221  thread_index,
1222  sw_if_index1)))
1223  goto trace01;
1224  }
1225  else
1226  {
1227  if (PREDICT_FALSE
1229  (sm, node, sw_if_index1, ip1, proto1,
1230  rx_fib_index1, thread_index)))
1231  goto trace01;
1232  }
1233 
1234  next1 = slow_path (sm, b1, ip1, rx_fib_index1, &key1,
1235  &s1, node, next1, thread_index, now);
1236  if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP))
1237  goto trace01;
1238 
1239  if (PREDICT_FALSE (!s1))
1240  goto trace01;
1241  }
1242  else
1243  {
1245  goto trace01;
1246  }
1247  }
1248  else
1249  s1 =
1250  pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1251  value1.value);
1252 
1253  b1->flags |= VNET_BUFFER_F_IS_NATED;
1254 
1255  old_addr1 = ip1->src_address.as_u32;
1256  ip1->src_address = s1->out2in.addr;
1257  new_addr1 = ip1->src_address.as_u32;
1258  if (!is_output_feature)
1259  vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
1260 
1261  sum1 = ip1->checksum;
1262  sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1263  ip4_header_t,
1264  src_address /* changed member */ );
1265  ip1->checksum = ip_csum_fold (sum1);
1266 
1267  if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1268  {
1269  old_port1 = tcp1->src_port;
1270  tcp1->src_port = s1->out2in.port;
1271  new_port1 = tcp1->src_port;
1272 
1273  sum1 = tcp1->checksum;
1274  sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1275  ip4_header_t,
1276  dst_address /* changed member */ );
1277  sum1 = ip_csum_update (sum1, old_port1, new_port1,
1278  ip4_header_t /* cheat */ ,
1279  length /* changed member */ );
1280  mss_clamping (sm, tcp1, &sum1);
1281  tcp1->checksum = ip_csum_fold (sum1);
1282  tcp_packets++;
1283  }
1284  else
1285  {
1286  old_port1 = udp1->src_port;
1287  udp1->src_port = s1->out2in.port;
1288  udp1->checksum = 0;
1289  udp_packets++;
1290  }
1291 
1292  /* Accounting */
1294  vlib_buffer_length_in_chain (vm, b1),
1295  thread_index);
1296  /* Per-user LRU list maintenance */
1297  nat44_session_update_lru (sm, s1, thread_index);
1298  trace01:
1299 
1301  && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1302  {
1303  snat_in2out_trace_t *t =
1304  vlib_add_trace (vm, node, b1, sizeof (*t));
1305  t->sw_if_index = sw_if_index1;
1306  t->next_index = next1;
1307  t->session_index = ~0;
1308  if (s1)
1309  t->session_index =
1310  s1 - sm->per_thread_data[thread_index].sessions;
1311  }
1312 
1313  pkts_processed += next1 == SNAT_IN2OUT_NEXT_LOOKUP;
1314 
1315  /* verify speculative enqueues, maybe switch current next frame */
1316  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1317  to_next, n_left_to_next,
1318  bi0, bi1, next0, next1);
1319  }
1320 
1321  while (n_left_from > 0 && n_left_to_next > 0)
1322  {
1323  u32 bi0;
1324  vlib_buffer_t *b0;
1325  u32 next0;
1326  u32 sw_if_index0;
1327  ip4_header_t *ip0;
1328  ip_csum_t sum0;
1329  u32 new_addr0, old_addr0;
1330  u16 old_port0, new_port0;
1331  udp_header_t *udp0;
1332  tcp_header_t *tcp0;
1333  icmp46_header_t *icmp0;
1334  snat_session_key_t key0;
1335  u32 rx_fib_index0;
1336  u32 proto0;
1337  snat_session_t *s0 = 0;
1338  clib_bihash_kv_8_8_t kv0, value0;
1339  u32 iph_offset0 = 0;
1340 
1341  /* speculatively enqueue b0 to the current next frame */
1342  bi0 = from[0];
1343  to_next[0] = bi0;
1344  from += 1;
1345  to_next += 1;
1346  n_left_from -= 1;
1347  n_left_to_next -= 1;
1348 
1349  b0 = vlib_get_buffer (vm, bi0);
1350  next0 = SNAT_IN2OUT_NEXT_LOOKUP;
1351 
1352  if (is_output_feature)
1353  iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1354 
1355  ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1356  iph_offset0);
1357 
1358  udp0 = ip4_next_header (ip0);
1359  tcp0 = (tcp_header_t *) udp0;
1360  icmp0 = (icmp46_header_t *) udp0;
1361 
1362  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1363  rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
1364  sw_if_index0);
1365 
1366  if (PREDICT_FALSE (ip0->ttl == 1))
1367  {
1368  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1369  icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1370  ICMP4_time_exceeded_ttl_exceeded_in_transit,
1371  0);
1373  goto trace0;
1374  }
1375 
1376  proto0 = ip_proto_to_snat_proto (ip0->protocol);
1377 
1378  /* Next configured feature, probably ip4-lookup */
1379  if (is_slow_path)
1380  {
1381  if (PREDICT_FALSE (proto0 == ~0))
1382  {
1384  (sm, b0, ip0, rx_fib_index0))
1385  {
1386  next0 = SNAT_IN2OUT_NEXT_DROP;
1387  b0->error =
1388  node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
1389  }
1390  other_packets++;
1391  goto trace0;
1392  }
1393 
1394  if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1395  {
1396  next0 = icmp_in2out_slow_path
1397  (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1398  next0, now, thread_index, &s0);
1399  icmp_packets++;
1400  goto trace0;
1401  }
1402  }
1403  else
1404  {
1405  if (PREDICT_FALSE (proto0 == ~0))
1406  {
1408  goto trace0;
1409  }
1410 
1411  if (ip4_is_fragment (ip0))
1412  {
1413  next0 = SNAT_IN2OUT_NEXT_REASS;
1414  fragments++;
1415  goto trace0;
1416  }
1417 
1418  if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1419  {
1421  goto trace0;
1422  }
1423  }
1424 
1425  key0.addr = ip0->src_address;
1426  key0.port = udp0->src_port;
1427  key0.protocol = proto0;
1428  key0.fib_index = rx_fib_index0;
1429 
1430  kv0.key = key0.as_u64;
1431 
1432  if (clib_bihash_search_8_8
1433  (&sm->per_thread_data[thread_index].in2out, &kv0, &value0))
1434  {
1435  if (is_slow_path)
1436  {
1437  if (is_output_feature)
1438  {
1440  ip0,
1441  proto0,
1442  udp0->src_port,
1443  udp0->dst_port,
1444  thread_index,
1445  sw_if_index0)))
1446  goto trace0;
1447  }
1448  else
1449  {
1450  if (PREDICT_FALSE
1452  (sm, node, sw_if_index0, ip0, proto0,
1453  rx_fib_index0, thread_index)))
1454  goto trace0;
1455  }
1456 
1457  next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
1458  &s0, node, next0, thread_index, now);
1459 
1460  if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
1461  goto trace0;
1462 
1463  if (PREDICT_FALSE (!s0))
1464  goto trace0;
1465  }
1466  else
1467  {
1469  goto trace0;
1470  }
1471  }
1472  else
1473  s0 =
1474  pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1475  value0.value);
1476 
1477  b0->flags |= VNET_BUFFER_F_IS_NATED;
1478 
1479  old_addr0 = ip0->src_address.as_u32;
1480  ip0->src_address = s0->out2in.addr;
1481  new_addr0 = ip0->src_address.as_u32;
1482  if (!is_output_feature)
1483  vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1484 
1485  sum0 = ip0->checksum;
1486  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1487  ip4_header_t,
1488  src_address /* changed member */ );
1489  ip0->checksum = ip_csum_fold (sum0);
1490 
1491  if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1492  {
1493  old_port0 = tcp0->src_port;
1494  tcp0->src_port = s0->out2in.port;
1495  new_port0 = tcp0->src_port;
1496 
1497  sum0 = tcp0->checksum;
1498  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1499  ip4_header_t,
1500  dst_address /* changed member */ );
1501  sum0 = ip_csum_update (sum0, old_port0, new_port0,
1502  ip4_header_t /* cheat */ ,
1503  length /* changed member */ );
1504  mss_clamping (sm, tcp0, &sum0);
1505  tcp0->checksum = ip_csum_fold (sum0);
1506  tcp_packets++;
1507  }
1508  else
1509  {
1510  old_port0 = udp0->src_port;
1511  udp0->src_port = s0->out2in.port;
1512  udp0->checksum = 0;
1513  udp_packets++;
1514  }
1515 
1516  /* Accounting */
1518  vlib_buffer_length_in_chain (vm, b0),
1519  thread_index);
1520  /* Per-user LRU list maintenance */
1521  nat44_session_update_lru (sm, s0, thread_index);
1522 
1523  trace0:
1525  && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1526  {
1527  snat_in2out_trace_t *t =
1528  vlib_add_trace (vm, node, b0, sizeof (*t));
1529  t->is_slow_path = is_slow_path;
1530  t->sw_if_index = sw_if_index0;
1531  t->next_index = next0;
1532  t->session_index = ~0;
1533  if (s0)
1534  t->session_index =
1535  s0 - sm->per_thread_data[thread_index].sessions;
1536  }
1537 
1538  pkts_processed += next0 == SNAT_IN2OUT_NEXT_LOOKUP;
1539 
1540  /* verify speculative enqueue, maybe switch current next frame */
1541  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1542  to_next, n_left_to_next,
1543  bi0, next0);
1544  }
1545 
1546  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1547  }
1548 
1549  vlib_node_increment_counter (vm, stats_node_index,
1550  SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
1551  pkts_processed);
1552  vlib_node_increment_counter (vm, stats_node_index,
1553  SNAT_IN2OUT_ERROR_TCP_PACKETS, tcp_packets);
1554  vlib_node_increment_counter (vm, stats_node_index,
1555  SNAT_IN2OUT_ERROR_UDP_PACKETS, tcp_packets);
1556  vlib_node_increment_counter (vm, stats_node_index,
1557  SNAT_IN2OUT_ERROR_ICMP_PACKETS, icmp_packets);
1558  vlib_node_increment_counter (vm, stats_node_index,
1559  SNAT_IN2OUT_ERROR_OTHER_PACKETS,
1560  other_packets);
1561  vlib_node_increment_counter (vm, stats_node_index,
1562  SNAT_IN2OUT_ERROR_FRAGMENTS, fragments);
1563 
1564  return frame->n_vectors;
1565 }
1566 
1568  vlib_node_runtime_t * node,
1569  vlib_frame_t * frame)
1570 {
1571  return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */ ,
1572  0);
1573 }
1574 
1575 /* *INDENT-OFF* */
1577  .name = "nat44-in2out",
1578  .vector_size = sizeof (u32),
1579  .format_trace = format_snat_in2out_trace,
1580  .type = VLIB_NODE_TYPE_INTERNAL,
1581 
1582  .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1583  .error_strings = snat_in2out_error_strings,
1584 
1585  .runtime_data_bytes = sizeof (snat_runtime_t),
1586 
1587  .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1588 
1589  /* edit / add dispositions here */
1590  .next_nodes = {
1591  [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1592  [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1593  [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
1594  [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1595  [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
1596  },
1597 };
1598 /* *INDENT-ON* */
1599 
1601  vlib_node_runtime_t * node,
1602  vlib_frame_t * frame)
1603 {
1604  return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */ ,
1605  1);
1606 }
1607 
1608 /* *INDENT-OFF* */
1610  .name = "nat44-in2out-output",
1611  .vector_size = sizeof (u32),
1612  .format_trace = format_snat_in2out_trace,
1613  .type = VLIB_NODE_TYPE_INTERNAL,
1614 
1615  .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1616  .error_strings = snat_in2out_error_strings,
1617 
1618  .runtime_data_bytes = sizeof (snat_runtime_t),
1619 
1620  .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1621 
1622  /* edit / add dispositions here */
1623  .next_nodes = {
1624  [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1625  [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
1626  [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
1627  [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1628  [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
1629  },
1630 };
1631 /* *INDENT-ON* */
1632 
1634  vlib_node_runtime_t * node,
1635  vlib_frame_t * frame)
1636 {
1637  return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */ ,
1638  0);
1639 }
1640 
1641 /* *INDENT-OFF* */
1643  .name = "nat44-in2out-slowpath",
1644  .vector_size = sizeof (u32),
1645  .format_trace = format_snat_in2out_trace,
1646  .type = VLIB_NODE_TYPE_INTERNAL,
1647 
1648  .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1649  .error_strings = snat_in2out_error_strings,
1650 
1651  .runtime_data_bytes = sizeof (snat_runtime_t),
1652 
1653  .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1654 
1655  /* edit / add dispositions here */
1656  .next_nodes = {
1657  [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1658  [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1659  [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
1660  [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1661  [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
1662  },
1663 };
1664 /* *INDENT-ON* */
1665 
1667  vlib_node_runtime_t * node,
1668  vlib_frame_t * frame)
1669 {
1670  return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */ ,
1671  1);
1672 }
1673 
1674 /* *INDENT-OFF* */
1676  .name = "nat44-in2out-output-slowpath",
1677  .vector_size = sizeof (u32),
1678  .format_trace = format_snat_in2out_trace,
1679  .type = VLIB_NODE_TYPE_INTERNAL,
1680 
1681  .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1682  .error_strings = snat_in2out_error_strings,
1683 
1684  .runtime_data_bytes = sizeof (snat_runtime_t),
1685 
1686  .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1687 
1688  /* edit / add dispositions here */
1689  .next_nodes = {
1690  [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1691  [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
1692  [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
1693  [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1694  [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
1695  },
1696 };
1697 /* *INDENT-ON* */
1698 
1700  vlib_node_runtime_t * node,
1701  vlib_frame_t * frame)
1702 {
1703  u32 n_left_from, *from, *to_next;
1704  snat_in2out_next_t next_index;
1705  u32 pkts_processed = 0, cached_fragments = 0;
1706  snat_main_t *sm = &snat_main;
1707  f64 now = vlib_time_now (vm);
1708  u32 thread_index = vm->thread_index;
1710  &sm->per_thread_data[thread_index];
1711  u32 *fragments_to_drop = 0;
1712  u32 *fragments_to_loopback = 0;
1713 
1714  from = vlib_frame_vector_args (frame);
1715  n_left_from = frame->n_vectors;
1716  next_index = node->cached_next_index;
1717 
1718  while (n_left_from > 0)
1719  {
1720  u32 n_left_to_next;
1721 
1722  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1723 
1724  while (n_left_from > 0 && n_left_to_next > 0)
1725  {
1726  u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
1727  vlib_buffer_t *b0;
1728  u32 next0;
1729  u8 cached0 = 0;
1730  ip4_header_t *ip0;
1731  nat_reass_ip4_t *reass0;
1732  udp_header_t *udp0;
1733  tcp_header_t *tcp0;
1734  icmp46_header_t *icmp0;
1735  snat_session_key_t key0;
1736  clib_bihash_kv_8_8_t kv0, value0;
1737  snat_session_t *s0 = 0;
1738  u16 old_port0, new_port0;
1739  ip_csum_t sum0;
1740 
1741  /* speculatively enqueue b0 to the current next frame */
1742  bi0 = from[0];
1743  to_next[0] = bi0;
1744  from += 1;
1745  to_next += 1;
1746  n_left_from -= 1;
1747  n_left_to_next -= 1;
1748 
1749  b0 = vlib_get_buffer (vm, bi0);
1750  next0 = SNAT_IN2OUT_NEXT_LOOKUP;
1751 
1752  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1753  rx_fib_index0 =
1755  sw_if_index0);
1756 
1758  {
1759  next0 = SNAT_IN2OUT_NEXT_DROP;
1760  b0->error = node->errors[SNAT_IN2OUT_ERROR_DROP_FRAGMENT];
1761  goto trace0;
1762  }
1763 
1764  ip0 = (ip4_header_t *) vlib_buffer_get_current (b0);
1765  udp0 = ip4_next_header (ip0);
1766  tcp0 = (tcp_header_t *) udp0;
1767  icmp0 = (icmp46_header_t *) udp0;
1768  proto0 = ip_proto_to_snat_proto (ip0->protocol);
1769 
1771  ip0->dst_address,
1772  ip0->fragment_id,
1773  ip0->protocol,
1774  1, &fragments_to_drop);
1775 
1776  if (PREDICT_FALSE (!reass0))
1777  {
1778  next0 = SNAT_IN2OUT_NEXT_DROP;
1779  b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_REASS];
1780  nat_log_notice ("maximum reassemblies exceeded");
1781  goto trace0;
1782  }
1783 
1785  {
1786  if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1787  {
1788  next0 = icmp_in2out_slow_path
1789  (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1790  next0, now, thread_index, &s0);
1791 
1792  if (PREDICT_TRUE (next0 != SNAT_IN2OUT_NEXT_DROP))
1793  {
1794  if (s0)
1795  reass0->sess_index = s0 - per_thread_data->sessions;
1796  else
1797  reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1798  nat_ip4_reass_get_frags (reass0,
1799  &fragments_to_loopback);
1800  }
1801 
1802  goto trace0;
1803  }
1804 
1805  key0.addr = ip0->src_address;
1806  key0.port = udp0->src_port;
1807  key0.protocol = proto0;
1808  key0.fib_index = rx_fib_index0;
1809  kv0.key = key0.as_u64;
1810 
1811  if (clib_bihash_search_8_8
1812  (&per_thread_data->in2out, &kv0, &value0))
1813  {
1814  if (PREDICT_FALSE
1816  (sm, node, sw_if_index0, ip0, proto0, rx_fib_index0,
1817  thread_index)))
1818  goto trace0;
1819 
1820  next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
1821  &s0, node, next0, thread_index, now);
1822 
1823  if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
1824  goto trace0;
1825 
1826  if (PREDICT_FALSE (!s0))
1827  goto trace0;
1828 
1829  reass0->sess_index = s0 - per_thread_data->sessions;
1830  }
1831  else
1832  {
1833  s0 = pool_elt_at_index (per_thread_data->sessions,
1834  value0.value);
1835  reass0->sess_index = value0.value;
1836  }
1837  nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
1838  }
1839  else
1840  {
1841  if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
1842  {
1844  (thread_index, reass0, bi0, &fragments_to_drop))
1845  {
1846  b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_FRAG];
1848  ("maximum fragments per reassembly exceeded");
1849  next0 = SNAT_IN2OUT_NEXT_DROP;
1850  goto trace0;
1851  }
1852  cached0 = 1;
1853  goto trace0;
1854  }
1855  s0 = pool_elt_at_index (per_thread_data->sessions,
1856  reass0->sess_index);
1857  }
1858 
1859  old_addr0 = ip0->src_address.as_u32;
1860  ip0->src_address = s0->out2in.addr;
1861  new_addr0 = ip0->src_address.as_u32;
1862  vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1863 
1864  sum0 = ip0->checksum;
1865  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1866  ip4_header_t,
1867  src_address /* changed member */ );
1868  ip0->checksum = ip_csum_fold (sum0);
1869 
1871  {
1872  if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1873  {
1874  old_port0 = tcp0->src_port;
1875  tcp0->src_port = s0->out2in.port;
1876  new_port0 = tcp0->src_port;
1877 
1878  sum0 = tcp0->checksum;
1879  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1880  ip4_header_t,
1881  dst_address /* changed member */ );
1882  sum0 = ip_csum_update (sum0, old_port0, new_port0,
1883  ip4_header_t /* cheat */ ,
1884  length /* changed member */ );
1885  tcp0->checksum = ip_csum_fold (sum0);
1886  }
1887  else
1888  {
1889  old_port0 = udp0->src_port;
1890  udp0->src_port = s0->out2in.port;
1891  udp0->checksum = 0;
1892  }
1893  }
1894 
1895  /* Hairpinning */
1896  nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port,
1897  s0->ext_host_port, proto0, 0);
1898 
1899  /* Accounting */
1901  vlib_buffer_length_in_chain (vm, b0),
1902  thread_index);
1903  /* Per-user LRU list maintenance */
1904  nat44_session_update_lru (sm, s0, thread_index);
1905 
1906  trace0:
1907  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1908  && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1909  {
1910  nat44_reass_trace_t *t =
1911  vlib_add_trace (vm, node, b0, sizeof (*t));
1912  t->cached = cached0;
1913  t->sw_if_index = sw_if_index0;
1914  t->next_index = next0;
1915  }
1916 
1917  if (cached0)
1918  {
1919  n_left_to_next++;
1920  to_next--;
1921  cached_fragments++;
1922  }
1923  else
1924  {
1925  pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
1926 
1927  /* verify speculative enqueue, maybe switch current next frame */
1928  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1929  to_next, n_left_to_next,
1930  bi0, next0);
1931  }
1932 
1933  if (n_left_from == 0 && vec_len (fragments_to_loopback))
1934  {
1935  from = vlib_frame_vector_args (frame);
1936  u32 len = vec_len (fragments_to_loopback);
1937  if (len <= VLIB_FRAME_SIZE)
1938  {
1939  clib_memcpy_fast (from, fragments_to_loopback,
1940  sizeof (u32) * len);
1941  n_left_from = len;
1942  vec_reset_length (fragments_to_loopback);
1943  }
1944  else
1945  {
1946  clib_memcpy_fast (from, fragments_to_loopback +
1947  (len - VLIB_FRAME_SIZE),
1948  sizeof (u32) * VLIB_FRAME_SIZE);
1949  n_left_from = VLIB_FRAME_SIZE;
1950  _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
1951  }
1952  }
1953  }
1954 
1955  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1956  }
1957 
1959  SNAT_IN2OUT_ERROR_PROCESSED_FRAGMENTS,
1960  pkts_processed);
1962  SNAT_IN2OUT_ERROR_CACHED_FRAGMENTS,
1963  cached_fragments);
1964 
1965  nat_send_all_to_node (vm, fragments_to_drop, node,
1966  &node->errors[SNAT_IN2OUT_ERROR_DROP_FRAGMENT],
1968 
1969  vec_free (fragments_to_drop);
1970  vec_free (fragments_to_loopback);
1971  return frame->n_vectors;
1972 }
1973 
1974 /* *INDENT-OFF* */
1976  .name = "nat44-in2out-reass",
1977  .vector_size = sizeof (u32),
1978  .format_trace = format_nat44_reass_trace,
1979  .type = VLIB_NODE_TYPE_INTERNAL,
1980 
1981  .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1982  .error_strings = snat_in2out_error_strings,
1983 
1984  .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1985  .next_nodes = {
1986  [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1987  [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1988  [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
1989  [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1990  [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
1991  },
1992 };
1993 /* *INDENT-ON* */
1994 
1996  vlib_node_runtime_t * node,
1997  vlib_frame_t * frame)
1998 {
1999  u32 n_left_from, *from, *to_next;
2000  snat_in2out_next_t next_index;
2001  u32 pkts_processed = 0;
2002  snat_main_t *sm = &snat_main;
2003  u32 stats_node_index;
2004 
2005  stats_node_index = sm->in2out_fast_node_index;
2006 
2007  from = vlib_frame_vector_args (frame);
2008  n_left_from = frame->n_vectors;
2009  next_index = node->cached_next_index;
2010 
2011  while (n_left_from > 0)
2012  {
2013  u32 n_left_to_next;
2014 
2015  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2016 
2017  while (n_left_from > 0 && n_left_to_next > 0)
2018  {
2019  u32 bi0;
2020  vlib_buffer_t *b0;
2021  u32 next0;
2022  u32 sw_if_index0;
2023  ip4_header_t *ip0;
2024  ip_csum_t sum0;
2025  u32 new_addr0, old_addr0;
2026  u16 old_port0, new_port0;
2027  udp_header_t *udp0;
2028  tcp_header_t *tcp0;
2029  icmp46_header_t *icmp0;
2030  snat_session_key_t key0, sm0;
2031  u32 proto0;
2032  u32 rx_fib_index0;
2033 
2034  /* speculatively enqueue b0 to the current next frame */
2035  bi0 = from[0];
2036  to_next[0] = bi0;
2037  from += 1;
2038  to_next += 1;
2039  n_left_from -= 1;
2040  n_left_to_next -= 1;
2041 
2042  b0 = vlib_get_buffer (vm, bi0);
2043  next0 = SNAT_IN2OUT_NEXT_LOOKUP;
2044 
2045  ip0 = vlib_buffer_get_current (b0);
2046  udp0 = ip4_next_header (ip0);
2047  tcp0 = (tcp_header_t *) udp0;
2048  icmp0 = (icmp46_header_t *) udp0;
2049 
2050  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
2051  rx_fib_index0 =
2053 
2054  if (PREDICT_FALSE (ip0->ttl == 1))
2055  {
2056  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2057  icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
2058  ICMP4_time_exceeded_ttl_exceeded_in_transit,
2059  0);
2061  goto trace0;
2062  }
2063 
2064  proto0 = ip_proto_to_snat_proto (ip0->protocol);
2065 
2066  if (PREDICT_FALSE (proto0 == ~0))
2067  goto trace0;
2068 
2069  if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
2070  {
2071  next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0,
2072  rx_fib_index0, node, next0, ~0, 0, 0);
2073  goto trace0;
2074  }
2075 
2076  key0.addr = ip0->src_address;
2077  key0.protocol = proto0;
2078  key0.port = udp0->src_port;
2079  key0.fib_index = rx_fib_index0;
2080 
2081  if (snat_static_mapping_match (sm, key0, &sm0, 0, 0, 0, 0, 0, 0))
2082  {
2083  b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
2084  next0 = SNAT_IN2OUT_NEXT_DROP;
2085  goto trace0;
2086  }
2087 
2088  new_addr0 = sm0.addr.as_u32;
2089  new_port0 = sm0.port;
2090  vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
2091  old_addr0 = ip0->src_address.as_u32;
2092  ip0->src_address.as_u32 = new_addr0;
2093 
2094  sum0 = ip0->checksum;
2095  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
2096  ip4_header_t,
2097  src_address /* changed member */ );
2098  ip0->checksum = ip_csum_fold (sum0);
2099 
2100  if (PREDICT_FALSE (new_port0 != udp0->dst_port))
2101  {
2102  if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
2103  {
2104  old_port0 = tcp0->src_port;
2105  tcp0->src_port = new_port0;
2106 
2107  sum0 = tcp0->checksum;
2108  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
2109  ip4_header_t,
2110  dst_address /* changed member */ );
2111  sum0 = ip_csum_update (sum0, old_port0, new_port0,
2112  ip4_header_t /* cheat */ ,
2113  length /* changed member */ );
2114  mss_clamping (sm, tcp0, &sum0);
2115  tcp0->checksum = ip_csum_fold (sum0);
2116  }
2117  else
2118  {
2119  old_port0 = udp0->src_port;
2120  udp0->src_port = new_port0;
2121  udp0->checksum = 0;
2122  }
2123  }
2124  else
2125  {
2126  if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
2127  {
2128  sum0 = tcp0->checksum;
2129  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
2130  ip4_header_t,
2131  dst_address /* changed member */ );
2132  mss_clamping (sm, tcp0, &sum0);
2133  tcp0->checksum = ip_csum_fold (sum0);
2134  }
2135  }
2136 
2137  /* Hairpinning */
2138  snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0, 0);
2139 
2140  trace0:
2141  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
2142  && (b0->flags & VLIB_BUFFER_IS_TRACED)))
2143  {
2144  snat_in2out_trace_t *t =
2145  vlib_add_trace (vm, node, b0, sizeof (*t));
2146  t->sw_if_index = sw_if_index0;
2147  t->next_index = next0;
2148  }
2149 
2150  pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
2151 
2152  /* verify speculative enqueue, maybe switch current next frame */
2153  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2154  to_next, n_left_to_next,
2155  bi0, next0);
2156  }
2157 
2158  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2159  }
2160 
2161  vlib_node_increment_counter (vm, stats_node_index,
2162  SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
2163  pkts_processed);
2164  return frame->n_vectors;
2165 }
2166 
2167 
2168 /* *INDENT-OFF* */
2170  .name = "nat44-in2out-fast",
2171  .vector_size = sizeof (u32),
2172  .format_trace = format_snat_in2out_fast_trace,
2173  .type = VLIB_NODE_TYPE_INTERNAL,
2174 
2175  .n_errors = ARRAY_LEN(snat_in2out_error_strings),
2176  .error_strings = snat_in2out_error_strings,
2177 
2178  .runtime_data_bytes = sizeof (snat_runtime_t),
2179 
2180  .n_next_nodes = SNAT_IN2OUT_N_NEXT,
2181 
2182  /* edit / add dispositions here */
2183  .next_nodes = {
2184  [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
2185  [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
2186  [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
2187  [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2188  [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
2189  },
2190 };
2191 /* *INDENT-ON* */
2192 
2193 /*
2194  * fd.io coding-style-patch-verification: ON
2195  *
2196  * Local Variables:
2197  * eval: (c-set-style "gnu")
2198  * End:
2199  */
ip4_address_t external_addr
Definition: nat.h:333
u32 sw_if_index
Definition: ipsec_gre.api:37
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:124
fib_protocol_t fp_proto
protocol type
Definition: fib_types.h:212
static ip_csum_t ip_incremental_checksum_buffer(vlib_main_t *vm, vlib_buffer_t *first_buffer, u32 first_buffer_offset, u32 n_bytes_to_checksum, ip_csum_t sum)
Definition: ip.h:154
nat_outside_fib_t * outside_fibs
Definition: nat.h:479
static u32 slow_path(snat_main_t *sm, vlib_buffer_t *b0, ip4_header_t *ip0, u32 rx_fib_index0, snat_session_key_t *key0, snat_session_t **sessionp, vlib_node_runtime_t *node, u32 next0, u32 thread_index, f64 now)
Definition: in2out.c:245
#define snat_is_session_static(s)
Check if SNAT session is created from static mapping.
Definition: nat.h:631
static u8 * format_snat_in2out_trace(u8 *s, va_list *args)
Definition: in2out.c:48
int nat_ip4_reass_add_fragment(u32 thread_index, nat_reass_ip4_t *reass, u32 bi, u32 **bi_to_drop)
Cache fragment.
Definition: nat_reass.c:392
#define CLIB_UNUSED(x)
Definition: clib.h:82
snat_in2out_error_t
Definition: in2out.c:95
ip4_address_t src_address
Definition: ip4_packet.h:170
static int nat_not_translate_output_feature(snat_main_t *sm, ip4_header_t *ip0, u32 proto0, u16 src_port, u16 dst_port, u32 thread_index, u32 sw_if_index)
Definition: in2out.c:154
static u32 nat44_session_get_timeout(snat_main_t *sm, snat_session_t *s)
Definition: nat_inlines.h:274
static u8 * format_snat_in2out_fast_trace(u8 *s, va_list *args)
Definition: in2out.c:64
static uword snat_in2out_node_fn_inline(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, int is_slow_path, int is_output_feature)
Definition: in2out.c:863
#define PREDICT_TRUE(x)
Definition: clib.h:112
static_always_inline u8 icmp_is_error_message(icmp46_header_t *icmp)
Definition: nat_inlines.h:54
unsigned long u64
Definition: types.h:89
#define clib_memcpy_fast(a, b, c)
Definition: string.h:81
static f64 vlib_time_now(vlib_main_t *vm)
Definition: main.h:255
static char * snat_in2out_error_strings[]
Definition: in2out.c:103
u32 fib_table_get_index_for_sw_if_index(fib_protocol_t proto, u32 sw_if_index)
Get the index of the FIB bound to the interface.
Definition: fib_table.c:956
u16 port_per_thread
Definition: nat.h:445
u32 thread_index
Definition: main.h:197
u8 data[0]
Packet data.
Definition: buffer.h:181
#define nat_log_warn(...)
Definition: nat.h:720
int i
uword ip_csum_t
Definition: ip_packet.h:181
snat_in2out_next_t
Definition: in2out.c:109
void nat_ha_sadd(ip4_address_t *in_addr, u16 in_port, ip4_address_t *out_addr, u16 out_port, ip4_address_t *eh_addr, u16 eh_port, ip4_address_t *ehn_addr, u16 ehn_port, u8 proto, u32 fib_index, u16 flags, u32 thread_index, u8 is_resync)
Create session add HA event.
Definition: nat_ha.c:681
u32 * fib_index_by_sw_if_index
Table index indexed by software interface.
Definition: ip4.h:112
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
#define VLIB_NODE_FN(node)
Definition: node.h:201
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:468
static uword vlib_buffer_length_in_chain(vlib_main_t *vm, vlib_buffer_t *b)
Get length in bytes of the buffer chain.
Definition: buffer_funcs.h:366
struct _tcp_header tcp_header_t
int snat_hairpinning(snat_main_t *sm, vlib_buffer_t *b0, ip4_header_t *ip0, udp_header_t *udp0, tcp_header_t *tcp0, u32 proto0, int is_ed)
u32 icmp_match_in2out_fast(snat_main_t *sm, vlib_node_runtime_t *node, u32 thread_index, vlib_buffer_t *b0, ip4_header_t *ip0, u8 *p_proto, snat_session_key_t *p_value, u8 *p_dont_translate, void *d, void *e)
Get address and port values to be used for ICMP packet translation.
Definition: in2out.c:577
unsigned char u8
Definition: types.h:56
u8 deterministic
Definition: nat.h:537
#define vec_reset_length(v)
Reset vector length to zero NULL-pointer tolerant.
double f64
Definition: types.h:142
static int ip4_is_fragment(const ip4_header_t *i)
Definition: ip4_packet.h:213
static int snat_not_translate_fast(snat_main_t *sm, vlib_node_runtime_t *node, u32 sw_if_index0, ip4_header_t *ip0, u32 proto0, u32 rx_fib_index0)
Check if packet should be translated.
Definition: nat_inlines.h:416
snat_session_t * nat_session_alloc_or_recycle(snat_main_t *sm, snat_user_t *u, u32 thread_index, f64 now)
Allocate new NAT session or recycle last used.
Definition: nat.c:351
u16 src_port
Definition: udp.api:41
clib_bihash_8_8_t in2out
Definition: nat.h:386
u32 in2out_reass_node_index
Definition: nat.h:507
vlib_node_registration_t snat_in2out_output_slowpath_node
(constructor) VLIB_REGISTER_NODE (snat_in2out_output_slowpath_node)
Definition: in2out.c:1675
u32 ip4_fib_table_get_index_for_sw_if_index(u32 sw_if_index)
Definition: ip4_fib.c:224
#define static_always_inline
Definition: clib.h:99
static uword ip4_header_checksum_is_valid(ip4_header_t *i)
Definition: ip4_packet.h:268
#define pool_foreach(VAR, POOL, BODY)
Iterate through pool.
Definition: pool.h:493
vlib_node_registration_t snat_in2out_fast_node
(constructor) VLIB_REGISTER_NODE (snat_in2out_fast_node)
Definition: in2out.c:2169
static int snat_not_translate(snat_main_t *sm, vlib_node_runtime_t *node, u32 sw_if_index0, ip4_header_t *ip0, u32 proto0, u32 rx_fib_index0, u32 thread_index)
Definition: in2out.c:120
ip4_address_t dst_address
Definition: ip4_packet.h:170
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:203
#define vec_elt_at_index(v, i)
Get vector value at index i checking that i is in bounds.
Aggregrate type for a prefix.
Definition: fib_types.h:203
u32 icmp_in2out(snat_main_t *sm, vlib_buffer_t *b0, ip4_header_t *ip0, icmp46_header_t *icmp0, u32 sw_if_index0, u32 rx_fib_index0, vlib_node_runtime_t *node, u32 next0, u32 thread_index, void *d, void *e)
Definition: in2out.c:648
ip4_main_t * ip4_main
Definition: nat.h:574
#define NAT_REASS_FLAG_ED_DONT_TRANSLATE
Definition: nat_reass.h:35
static void * ip4_next_header(ip4_header_t *i)
Definition: ip4_packet.h:241
unsigned int u32
Definition: types.h:88
vlib_node_registration_t snat_in2out_slowpath_node
(constructor) VLIB_REGISTER_NODE (snat_in2out_slowpath_node)
Definition: in2out.c:1642
void nat_ipfix_logging_max_sessions(u32 thread_index, u32 limit)
Generate maximum session entries exceeded event.
#define VLIB_FRAME_SIZE
Definition: node.h:376
fib_node_index_t fib_table_lookup(u32 fib_index, const fib_prefix_t *prefix)
Perfom a longest prefix match in the non-forwarding table.
Definition: fib_table.c:66
static u8 maximum_sessions_exceeded(snat_main_t *sm, u32 thread_index)
Definition: nat_inlines.h:95
int snat_static_mapping_match(snat_main_t *sm, snat_session_key_t match, snat_session_key_t *mapping, u8 by_external, u8 *is_addr_only, twice_nat_type_t *twice_nat, lb_nat_type_t *lb, ip4_address_t *ext_host_addr, u8 *is_identity_nat)
Match NAT44 static mapping.
Definition: nat.c:2498
void snat_free_outside_address_and_port(snat_address_t *addresses, u32 thread_index, snat_session_key_t *k)
Free outside address and port pair.
Definition: nat.c:2424
static void nat44_delete_session(snat_main_t *sm, snat_session_t *ses, u32 thread_index)
Definition: nat_inlines.h:169
#define foreach_snat_in2out_error
Definition: in2out.c:76
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:136
u32 max_translations
Definition: nat.h:542
static void mss_clamping(snat_main_t *sm, tcp_header_t *tcp, ip_csum_t *sum)
Definition: nat_inlines.h:353
int snat_alloc_outside_address_and_port(snat_address_t *addresses, u32 fib_index, u32 thread_index, snat_session_key_t *k, u16 port_per_thread, u32 snat_thread_index)
Alloc outside address and port.
Definition: nat.c:2643
snat_user_t * nat_user_get_or_create(snat_main_t *sm, ip4_address_t *addr, u32 fib_index, u32 thread_index)
Find or create NAT user.
Definition: nat.c:304
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:514
u32 fib_index
Definition: nat.h:260
u64 key
the key
Definition: bihash_8_8.h:33
static u32 icmp_in2out_slow_path(snat_main_t *sm, vlib_buffer_t *b0, ip4_header_t *ip0, icmp46_header_t *icmp0, u32 sw_if_index0, u32 rx_fib_index0, vlib_node_runtime_t *node, u32 next0, f64 now, u32 thread_index, snat_session_t **p_s0)
Definition: in2out.c:799
long ctx[MAX_CONNS]
Definition: main.c:144
vlib_main_t * vlib_main
Definition: nat.h:572
unsigned short u16
Definition: types.h:57
u16 protocol
Definition: nat.h:54
snat_static_mapping_t * static_mappings
Definition: nat.h:458
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:229
void nat_syslog_nat44_apmadd(u32 ssubix, u32 sfibix, ip4_address_t *isaddr, u16 isport, ip4_address_t *xsaddr, u16 xsport, snat_protocol_t proto)
Definition: nat_syslog.c:109
#define PREDICT_FALSE(x)
Definition: clib.h:111
vl_api_address_union_t src_address
Definition: ip_types.api:44
#define vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1)
Finish enqueueing two buffers forward in the graph.
Definition: buffer_node.h:70
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:218
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:338
#define nat_log_notice(...)
Definition: nat.h:722
u32 snat_icmp_hairpinning(snat_main_t *sm, vlib_buffer_t *b0, ip4_header_t *ip0, icmp46_header_t *icmp0, int is_ed)
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1150
u8 len
Definition: ip_types.api:49
int nat44_o2i_is_idle_session_cb(clib_bihash_kv_8_8_t *kv, void *arg)
Definition: out2in.c:116
u32 fib_entry_get_resolving_interface(fib_node_index_t entry_index)
Definition: fib_entry.c:1461
snat_interface_t * output_feature_interfaces
Definition: nat.h:462
snat_main_t snat_main
Definition: nat.c:39
The fine-grained event logger allows lightweight, thread-safe event logging at minimum cost...
void snat_ipfix_logging_nat44_ses_delete(u32 thread_index, u32 src_ip, u32 nat_src_ip, snat_protocol_t snat_proto, u16 src_port, u16 nat_src_port, u32 vrf_id)
Generate NAT44 session delete event.
u64 value
the value
Definition: bihash_8_8.h:34
static int nat_in2out_sm_unknown_proto(snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip, u32 rx_fib_index)
Definition: in2out.c:825
vlib_node_registration_t nat44_in2out_reass_node
(constructor) VLIB_REGISTER_NODE (nat44_in2out_reass_node)
Definition: in2out.c:1975
static void nat44_delete_user_with_no_session(snat_main_t *sm, snat_user_t *u, u32 thread_index)
Definition: nat_inlines.h:147
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
u16 n_vectors
Definition: node.h:395
clib_bihash_8_8_t out2in
Definition: nat.h:385
u8 nat_reass_is_drop_frag(u8 is_ip6)
Get status of virtual fragmentation reassembly.
Definition: nat_reass.c:168
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:80
vlib_main_t * vm
Definition: buffer.c:312
vlib_node_registration_t snat_in2out_node
(constructor) VLIB_REGISTER_NODE (snat_in2out_node)
Definition: in2out.c:1576
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:341
void icmp4_error_set_vnet_buffer(vlib_buffer_t *b, u8 type, u8 code, u32 data)
Definition: icmp4.c:431
static void nat44_session_update_counters(snat_session_t *s, f64 now, uword bytes, u32 thread_index)
Definition: nat_inlines.h:297
u32 outside_fib_index
Definition: nat.h:547
u32 fib_node_index_t
A typedef of a node index.
Definition: fib_types.h:30
8 octet key, 8 octet key value pair
Definition: bihash_8_8.h:31
#define ARRAY_LEN(x)
Definition: clib.h:62
ip4_address_t addr
Definition: nat.h:52
static_always_inline snat_in2out_error_t icmp_get_key(ip4_header_t *ip0, snat_session_key_t *p_key0)
Definition: in2out.c:399
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:458
u32 icmp_match_in2out_slow(snat_main_t *sm, vlib_node_runtime_t *node, u32 thread_index, vlib_buffer_t *b0, ip4_header_t *ip0, u8 *p_proto, snat_session_key_t *p_value, u8 *p_dont_translate, void *d, void *e)
Get address and port values to be used for ICMP packet translation and create session if needed...
Definition: in2out.c:458
u32 in2out_fast_node_index
Definition: nat.h:504
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:513
#define ASSERT(truth)
u32 in2out_slowpath_node_index
Definition: nat.h:505
static void nat44_session_update_lru(snat_main_t *sm, snat_session_t *s, u32 thread_index)
Per-user LRU list maintenance.
Definition: nat_inlines.h:311
void nat_syslog_nat44_apmdel(u32 ssubix, u32 sfibix, ip4_address_t *isaddr, u16 isport, ip4_address_t *xsaddr, u16 xsport, snat_protocol_t proto)
Definition: nat_syslog.c:118
void nat_ha_sdel(ip4_address_t *out_addr, u16 out_port, ip4_address_t *eh_addr, u16 eh_port, u8 proto, u32 fib_index, u32 thread_index)
Create session delete HA event.
Definition: nat_ha.c:707
static void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace_funcs.h:57
#define vec_elt(v, i)
Get vector value at index i.
Definition: defs.h:47
format_function_t format_nat44_reass_trace
Definition: nat.h:623
static int ip4_is_first_fragment(const ip4_header_t *i)
Definition: ip4_packet.h:220
void nat_hairpinning_sm_unknown_proto(snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip)
static u32 ip_proto_to_snat_proto(u8 ip_proto)
The NAT inline functions.
Definition: nat_inlines.h:27
#define FIB_NODE_INDEX_INVALID
Definition: fib_types.h:31
static void user_session_increment(snat_main_t *sm, snat_user_t *u, u8 is_static)
Definition: nat_inlines.h:135
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
snat_main_per_thread_data_t * per_thread_data
Definition: nat.h:449
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:244
#define ip_csum_update(sum, old, new, type, field)
Definition: ip_packet.h:231
NAT syslog logging.
nat_reass_ip4_t * nat_ip4_reass_find_or_create(ip4_address_t src, ip4_address_t dst, u16 frag_id, u8 proto, u8 reset_timeout, u32 **bi_to_drop)
Find or create reassembly.
Definition: nat_reass.c:274
snat_address_t * addresses
Definition: nat.h:465
u32 in2out_node_index
Definition: nat.h:502
#define vnet_buffer(b)
Definition: buffer.h:369
#define SNAT_SESSION_FLAG_STATIC_MAPPING
Definition: nat.h:171
u8 forwarding_enabled
Definition: nat.h:532
#define vec_foreach(var, vec)
Vector iterator.
vlib_node_registration_t snat_in2out_output_node
(constructor) VLIB_REGISTER_NODE (snat_in2out_output_node)
Definition: in2out.c:1609
u16 flags
Copy of main node flags.
Definition: node.h:507
static void nat_send_all_to_node(vlib_main_t *vm, u32 *bi_vector, vlib_node_runtime_t *node, vlib_error_t *error, u32 next)
Definition: nat_inlines.h:105
u8 endpoint_dependent
Definition: nat.h:539
u16 dst_port
Definition: udp.api:42
static int ip4_header_bytes(const ip4_header_t *i)
Definition: ip4_packet.h:235
void nat_ip4_reass_get_frags(nat_reass_ip4_t *reass, u32 **bi)
Get cached fragments.
Definition: nat_reass.c:424
NAT plugin virtual fragmentation reassembly.
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:301
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:59
int nat44_i2o_is_idle_session_cb(clib_bihash_kv_8_8_t *kv, void *arg)
Definition: in2out.c:197
snat_session_t * sessions
Definition: nat.h:399
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:85
snat_icmp_match_function_t * icmp_match_in2out_cb
Definition: nat.h:436
clib_bihash_8_8_t static_mapping_by_local
Definition: nat.h:452
static u16 ip_csum_fold(ip_csum_t c)
Definition: ip_packet.h:237
void nat44_reass_hairpinning(snat_main_t *sm, vlib_buffer_t *b0, ip4_header_t *ip0, u16 sport, u16 dport, u32 proto0, int is_ed)
Definition: defs.h:46
NAT active-passive HA.
u16 fib_index
Definition: nat.h:54
u8 protocol
Definition: ipsec.api:96
static openssl_per_thread_data_t * per_thread_data
Definition: main.c:37
void snat_ipfix_logging_nat44_ses_create(u32 thread_index, u32 src_ip, u32 nat_src_ip, snat_protocol_t snat_proto, u16 src_port, u16 nat_src_port, u32 vrf_id)
Generate NAT44 session create event.