FD.io VPP  v20.05.1-6-gf53edbc3b
Vector Packet Processing
nat44_hairpinning.c
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1 /*
2  * Copyright (c) 2018 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 /**
16  * @file
17  * @brief NAT44 hairpinning
18  */
19 
20 #include <vlib/vlib.h>
21 #include <vnet/vnet.h>
22 #include <vnet/fib/ip4_fib.h>
23 #include <nat/nat.h>
24 #include <nat/nat_inlines.h>
25 
26 typedef enum
27 {
34 
35 typedef enum
36 {
41 
42 #define foreach_nat44_hairpin_error \
43 _(PROCESSED, "NAT44 hairpinning packets processed")
44 
45 typedef enum
46 {
47 #define _(sym,str) NAT44_HAIRPIN_ERROR_##sym,
49 #undef _
52 
53 static char *nat44_hairpin_error_strings[] = {
54 #define _(sym,string) string,
56 #undef _
57 };
58 
60 
63 {
64  snat_address_t *ap;
66  snat_session_key_t m_key;
67 
68  /* *INDENT-OFF* */
69  vec_foreach (ap, sm->addresses)
70  {
71  if (ap->addr.as_u32 == dst_addr->as_u32)
72  return 1;
73  }
74  /* *INDENT-ON* */
75 
76  m_key.addr.as_u32 = dst_addr->as_u32;
77  m_key.fib_index = 0;
78  m_key.port = 0;
79  m_key.protocol = 0;
80  kv.key = m_key.as_u64;
81  if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
82  return 1;
83 
84  return 0;
85 }
86 
87 #ifndef CLIB_MARCH_VARIANT
88 int
90  vlib_buffer_t * b0,
91  ip4_header_t * ip0,
92  udp_header_t * udp0,
93  tcp_header_t * tcp0, u32 proto0, int is_ed)
94 {
95  snat_session_key_t key0, sm0;
96  snat_session_t *s0;
97  clib_bihash_kv_8_8_t kv0, value0;
98  ip_csum_t sum0;
99  u32 new_dst_addr0 = 0, old_dst_addr0, ti = 0, si;
100  u16 new_dst_port0, old_dst_port0;
101  int rv;
102 
103  key0.addr = ip0->dst_address;
104  key0.port = udp0->dst_port;
105  key0.protocol = proto0;
106  key0.fib_index = sm->outside_fib_index;
107  kv0.key = key0.as_u64;
108 
109  /* Check if destination is static mappings */
110  if (!snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0, 0))
111  {
112  new_dst_addr0 = sm0.addr.as_u32;
113  new_dst_port0 = sm0.port;
114  vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
115  }
116  /* or active session */
117  else
118  {
119  if (sm->num_workers > 1)
120  ti =
121  (clib_net_to_host_u16 (udp0->dst_port) -
122  1024) / sm->port_per_thread;
123  else
124  ti = sm->num_workers;
125 
126  if (is_ed)
127  {
128  clib_bihash_kv_16_8_t ed_kv, ed_value;
129  make_ed_kv (&ip0->dst_address, &ip0->src_address,
130  ip0->protocol, sm->outside_fib_index, udp0->dst_port,
131  udp0->src_port, ~0ULL, &ed_kv);
132  rv = clib_bihash_search_16_8 (&sm->per_thread_data[ti].out2in_ed,
133  &ed_kv, &ed_value);
134  si = ed_value.value;
135  }
136  else
137  {
138  rv = clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0,
139  &value0);
140  si = value0.value;
141  }
142  if (rv)
143  return 0;
144 
146  new_dst_addr0 = s0->in2out.addr.as_u32;
147  new_dst_port0 = s0->in2out.port;
148  vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
149  }
150 
151  /* Destination is behind the same NAT, use internal address and port */
152  if (new_dst_addr0)
153  {
154  old_dst_addr0 = ip0->dst_address.as_u32;
155  ip0->dst_address.as_u32 = new_dst_addr0;
156  sum0 = ip0->checksum;
157  sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
158  ip4_header_t, dst_address);
159  ip0->checksum = ip_csum_fold (sum0);
160 
161  old_dst_port0 = tcp0->dst;
162  if (PREDICT_TRUE (new_dst_port0 != old_dst_port0))
163  {
164  if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
165  {
166  tcp0->dst = new_dst_port0;
167  sum0 = tcp0->checksum;
168  sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
169  ip4_header_t, dst_address);
170  sum0 = ip_csum_update (sum0, old_dst_port0, new_dst_port0,
171  ip4_header_t /* cheat */ , length);
172  tcp0->checksum = ip_csum_fold (sum0);
173  }
174  else
175  {
176  udp0->dst_port = new_dst_port0;
177  udp0->checksum = 0;
178  }
179  }
180  else
181  {
182  if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
183  {
184  sum0 = tcp0->checksum;
185  sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
186  ip4_header_t, dst_address);
187  tcp0->checksum = ip_csum_fold (sum0);
188  }
189  }
190  return 1;
191  }
192  return 0;
193 }
194 #endif
195 
196 #ifndef CLIB_MARCH_VARIANT
197 u32
199  vlib_buffer_t * b0,
200  ip4_header_t * ip0, icmp46_header_t * icmp0, int is_ed)
201 {
202  snat_session_key_t key0;
203  clib_bihash_kv_8_8_t kv0, value0;
204  u32 old_dst_addr0, new_dst_addr0;
205  u32 old_addr0, new_addr0;
206  u16 old_port0, new_port0;
207  u16 old_checksum0, new_checksum0;
208  u32 si, ti = 0;
209  ip_csum_t sum0;
210  snat_session_t *s0;
212 
214  (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags))
215  {
216  ip4_header_t *inner_ip0 = 0;
217  tcp_udp_header_t *l4_header = 0;
218 
219  inner_ip0 = (ip4_header_t *) ((icmp_echo_header_t *) (icmp0 + 1) + 1);
220  l4_header = ip4_next_header (inner_ip0);
222 
223  if (protocol != NAT_PROTOCOL_TCP && protocol != NAT_PROTOCOL_UDP)
224  return 1;
225 
226  if (is_ed)
227  {
228  clib_bihash_kv_16_8_t ed_kv, ed_value;
229  make_ed_kv (&ip0->dst_address, &ip0->src_address,
230  inner_ip0->protocol, sm->outside_fib_index,
231  l4_header->src_port, l4_header->dst_port, ~0ULL,
232  &ed_kv);
233  if (clib_bihash_search_16_8
234  (&sm->per_thread_data[ti].out2in_ed, &ed_kv, &ed_value))
235  return 1;
236  si = ed_value.value;
237  }
238  else
239  {
240  key0.addr = ip0->dst_address;
241  key0.port = l4_header->src_port;
242  key0.protocol = protocol;
243  key0.fib_index = sm->outside_fib_index;
244  kv0.key = key0.as_u64;
245  if (clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0,
246  &value0))
247  return 1;
248  si = value0.value;
249  }
250  s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
251  new_dst_addr0 = s0->in2out.addr.as_u32;
252  vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
253 
254  /* update inner source IP address */
255  old_addr0 = inner_ip0->src_address.as_u32;
256  inner_ip0->src_address.as_u32 = new_dst_addr0;
257  new_addr0 = inner_ip0->src_address.as_u32;
258  sum0 = icmp0->checksum;
259  sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
260  src_address);
261  icmp0->checksum = ip_csum_fold (sum0);
262 
263  /* update inner IP header checksum */
264  old_checksum0 = inner_ip0->checksum;
265  sum0 = inner_ip0->checksum;
266  sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
267  src_address);
268  inner_ip0->checksum = ip_csum_fold (sum0);
269  new_checksum0 = inner_ip0->checksum;
270  sum0 = icmp0->checksum;
271  sum0 = ip_csum_update (sum0, old_checksum0, new_checksum0, ip4_header_t,
272  checksum);
273  icmp0->checksum = ip_csum_fold (sum0);
274 
275  /* update inner source port */
276  old_port0 = l4_header->src_port;
277  l4_header->src_port = s0->in2out.port;
278  new_port0 = l4_header->src_port;
279  sum0 = icmp0->checksum;
280  sum0 = ip_csum_update (sum0, old_port0, new_port0, tcp_udp_header_t,
281  src_port);
282  icmp0->checksum = ip_csum_fold (sum0);
283  }
284  else
285  {
286  key0.addr = ip0->dst_address;
287  key0.port = 0;
288  key0.protocol = 0;
289  key0.fib_index = sm->outside_fib_index;
290  kv0.key = key0.as_u64;
291 
292  if (clib_bihash_search_8_8
293  (&sm->static_mapping_by_external, &kv0, &value0))
294  {
295  if (!is_ed)
296  {
297  icmp_echo_header_t *echo0 = (icmp_echo_header_t *) (icmp0 + 1);
298  u16 icmp_id0 = echo0->identifier;
299  key0.addr = ip0->dst_address;
300  key0.port = icmp_id0;
301  key0.protocol = NAT_PROTOCOL_ICMP;
302  key0.fib_index = sm->outside_fib_index;
303  kv0.key = key0.as_u64;
304  if (sm->num_workers > 1)
305  ti =
306  (clib_net_to_host_u16 (icmp_id0) -
307  1024) / sm->port_per_thread;
308  else
309  ti = sm->num_workers;
310  int rv =
311  clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0,
312  &value0);
313  if (!rv)
314  {
315  si = value0.value;
316  s0 =
318  new_dst_addr0 = s0->in2out.addr.as_u32;
319  vnet_buffer (b0)->sw_if_index[VLIB_TX] =
320  s0->in2out.fib_index;
321  echo0->identifier = s0->in2out.port;
322  sum0 = icmp0->checksum;
323  sum0 = ip_csum_update (sum0, icmp_id0, s0->in2out.port,
324  icmp_echo_header_t, identifier);
325  icmp0->checksum = ip_csum_fold (sum0);
326  goto change_addr;
327  }
328  }
329 
330  return 1;
331  }
332 
333  m0 = pool_elt_at_index (sm->static_mappings, value0.value);
334 
335  new_dst_addr0 = m0->local_addr.as_u32;
336  if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0)
337  vnet_buffer (b0)->sw_if_index[VLIB_TX] = m0->fib_index;
338  }
339 change_addr:
340  /* Destination is behind the same NAT, use internal address and port */
341  if (new_dst_addr0)
342  {
343  old_dst_addr0 = ip0->dst_address.as_u32;
344  ip0->dst_address.as_u32 = new_dst_addr0;
345  sum0 = ip0->checksum;
346  sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
347  ip4_header_t, dst_address);
348  ip0->checksum = ip_csum_fold (sum0);
349  }
350  return 0;
351 }
352 #endif
353 
354 #ifndef CLIB_MARCH_VARIANT
355 void
358 {
361  u32 old_addr, new_addr;
362  ip_csum_t sum;
363 
364  make_sm_kv (&kv, &ip->dst_address, 0, 0, 0);
365  if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
366  return;
367 
368  m = pool_elt_at_index (sm->static_mappings, value.value);
369 
370  old_addr = ip->dst_address.as_u32;
371  new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
372  sum = ip->checksum;
373  sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
374  ip->checksum = ip_csum_fold (sum);
375 
376  if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
377  vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
378 }
379 #endif
380 
381 #ifndef CLIB_MARCH_VARIANT
382 void
385 {
386  u32 old_addr, new_addr = 0, ti = 0;
388  clib_bihash_kv_16_8_t s_kv, s_value;
390  ip_csum_t sum;
391  snat_session_t *s;
393 
394  if (sm->num_workers > 1)
395  ti = sm->worker_out2in_cb (b, ip, sm->outside_fib_index, 0);
396  else
397  ti = sm->num_workers;
398  tsm = &sm->per_thread_data[ti];
399 
400  old_addr = ip->dst_address.as_u32;
401  make_ed_kv (&ip->dst_address, &ip->src_address, ip->protocol,
402  sm->outside_fib_index, 0, 0, ~0ULL, &s_kv);
403  if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
404  {
405  make_sm_kv (&kv, &ip->dst_address, 0, 0, 0);
406  if (clib_bihash_search_8_8
407  (&sm->static_mapping_by_external, &kv, &value))
408  return;
409 
410  m = pool_elt_at_index (sm->static_mappings, value.value);
411  if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
412  vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
413  new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
414  }
415  else
416  {
417  s = pool_elt_at_index (sm->per_thread_data[ti].sessions, s_value.value);
418  if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
419  vnet_buffer (b)->sw_if_index[VLIB_TX] = s->in2out.fib_index;
420  new_addr = ip->dst_address.as_u32 = s->in2out.addr.as_u32;
421  }
422  sum = ip->checksum;
423  sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
424  ip->checksum = ip_csum_fold (sum);
425 }
426 #endif
427 
428 static inline uword
431  vlib_frame_t * frame, int is_ed)
432 {
433  u32 n_left_from, *from, *to_next, stats_node_index;
434  nat_hairpin_next_t next_index;
435  u32 pkts_processed = 0;
436  snat_main_t *sm = &snat_main;
438  u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
440 
441  stats_node_index = is_ed ? sm->ed_hairpinning_node_index :
443  from = vlib_frame_vector_args (frame);
444  n_left_from = frame->n_vectors;
445  next_index = node->cached_next_index;
446 
447  while (n_left_from > 0)
448  {
449  u32 n_left_to_next;
450 
451  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
452 
453  while (n_left_from > 0 && n_left_to_next > 0)
454  {
455  u32 bi0;
456  vlib_buffer_t *b0;
457  u32 next0;
458  ip4_header_t *ip0;
459  u32 proto0;
460  udp_header_t *udp0;
461  tcp_header_t *tcp0;
462 
463  /* speculatively enqueue b0 to the current next frame */
464  bi0 = from[0];
465  to_next[0] = bi0;
466  from += 1;
467  to_next += 1;
468  n_left_from -= 1;
469  n_left_to_next -= 1;
470 
471  b0 = vlib_get_buffer (vm, bi0);
472  ip0 = vlib_buffer_get_current (b0);
473  udp0 = ip4_next_header (ip0);
474  tcp0 = (tcp_header_t *) udp0;
475 
476  proto0 = ip_proto_to_nat_proto (ip0->protocol);
477 
479  &next0, 0);
480 
481  if (snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0, is_ed))
482  next0 = NAT_HAIRPIN_NEXT_LOOKUP;
483 
484  pkts_processed += next0 != NAT_HAIRPIN_NEXT_DROP;
485 
486  /* verify speculative enqueue, maybe switch current next frame */
487  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
488  to_next, n_left_to_next,
489  bi0, next0);
490  }
491 
492  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
493  }
494 
495  vlib_node_increment_counter (vm, stats_node_index,
496  NAT44_HAIRPIN_ERROR_PROCESSED, pkts_processed);
497  return frame->n_vectors;
498 }
499 
503 {
504  return nat44_hairpinning_fn_inline (vm, node, frame, 0);
505 }
506 
507 /* *INDENT-OFF* */
509  .name = "nat44-hairpinning",
510  .vector_size = sizeof (u32),
513  .error_strings = nat44_hairpin_error_strings,
514  .n_next_nodes = NAT_HAIRPIN_N_NEXT,
515  .next_nodes = {
516  [NAT_HAIRPIN_NEXT_DROP] = "error-drop",
517  [NAT_HAIRPIN_NEXT_LOOKUP] = "ip4-lookup",
518  },
519 };
520 /* *INDENT-ON* */
521 
525 {
526  return nat44_hairpinning_fn_inline (vm, node, frame, 1);
527 }
528 
529 /* *INDENT-OFF* */
531  .name = "nat44-ed-hairpinning",
532  .vector_size = sizeof (u32),
535  .error_strings = nat44_hairpin_error_strings,
536  .n_next_nodes = NAT_HAIRPIN_N_NEXT,
537  .next_nodes = {
538  [NAT_HAIRPIN_NEXT_DROP] = "error-drop",
539  [NAT_HAIRPIN_NEXT_LOOKUP] = "ip4-lookup",
540  },
541 };
542 /* *INDENT-ON* */
543 
544 static inline uword
547  vlib_frame_t * frame, int is_ed)
548 {
549  u32 n_left_from, *from, *to_next, stats_node_index;
550  nat_hairpin_next_t next_index;
551  u32 pkts_processed = 0;
552  snat_main_t *sm = &snat_main;
553 
554  stats_node_index = is_ed ? sm->ed_hairpin_dst_node_index :
556 
557  from = vlib_frame_vector_args (frame);
558  n_left_from = frame->n_vectors;
559  next_index = node->cached_next_index;
560 
561  while (n_left_from > 0)
562  {
563  u32 n_left_to_next;
564 
565  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
566 
567  while (n_left_from > 0 && n_left_to_next > 0)
568  {
569  u32 bi0;
570  vlib_buffer_t *b0;
571  u32 next0;
572  ip4_header_t *ip0;
573  u32 proto0;
574 
575  /* speculatively enqueue b0 to the current next frame */
576  bi0 = from[0];
577  to_next[0] = bi0;
578  from += 1;
579  to_next += 1;
580  n_left_from -= 1;
581  n_left_to_next -= 1;
582 
583  b0 = vlib_get_buffer (vm, bi0);
584  next0 = NAT_HAIRPIN_NEXT_LOOKUP;
585  ip0 = vlib_buffer_get_current (b0);
586 
587  proto0 = ip_proto_to_nat_proto (ip0->protocol);
588 
589  vnet_buffer (b0)->snat.flags = 0;
590  if (PREDICT_FALSE (is_hairpinning (sm, &ip0->dst_address)))
591  {
592  if (proto0 == NAT_PROTOCOL_TCP || proto0 == NAT_PROTOCOL_UDP)
593  {
594  udp_header_t *udp0 = ip4_next_header (ip0);
595  tcp_header_t *tcp0 = (tcp_header_t *) udp0;
596 
597  snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0, is_ed);
598  }
599  else if (proto0 == NAT_PROTOCOL_ICMP)
600  {
601  icmp46_header_t *icmp0 = ip4_next_header (ip0);
602 
603  snat_icmp_hairpinning (sm, b0, ip0, icmp0, is_ed);
604  }
605  else
606  {
607  if (is_ed)
609  else
610  nat_hairpinning_sm_unknown_proto (sm, b0, ip0);
611  }
612 
613  vnet_buffer (b0)->snat.flags = SNAT_FLAG_HAIRPINNING;
614  }
615 
616  pkts_processed += next0 != NAT_HAIRPIN_NEXT_DROP;
617 
618  /* verify speculative enqueue, maybe switch current next frame */
619  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
620  to_next, n_left_to_next,
621  bi0, next0);
622  }
623 
624  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
625  }
626 
627  vlib_node_increment_counter (vm, stats_node_index,
628  NAT44_HAIRPIN_ERROR_PROCESSED, pkts_processed);
629  return frame->n_vectors;
630 }
631 
635 {
636  return snat_hairpin_dst_fn_inline (vm, node, frame, 0);
637 }
638 
639 /* *INDENT-OFF* */
641  .name = "nat44-hairpin-dst",
642  .vector_size = sizeof (u32),
645  .error_strings = nat44_hairpin_error_strings,
646  .n_next_nodes = NAT_HAIRPIN_N_NEXT,
647  .next_nodes = {
648  [NAT_HAIRPIN_NEXT_DROP] = "error-drop",
649  [NAT_HAIRPIN_NEXT_LOOKUP] = "ip4-lookup",
650  },
651 };
652 /* *INDENT-ON* */
653 
657 {
658  return snat_hairpin_dst_fn_inline (vm, node, frame, 1);
659 }
660 
661 /* *INDENT-OFF* */
663  .name = "nat44-ed-hairpin-dst",
664  .vector_size = sizeof (u32),
667  .error_strings = nat44_hairpin_error_strings,
668  .n_next_nodes = NAT_HAIRPIN_N_NEXT,
669  .next_nodes = {
670  [NAT_HAIRPIN_NEXT_DROP] = "error-drop",
671  [NAT_HAIRPIN_NEXT_LOOKUP] = "ip4-lookup",
672  },
673 };
674 /* *INDENT-ON* */
675 
676 static inline uword
679  vlib_frame_t * frame, int is_ed)
680 {
681  u32 n_left_from, *from, *to_next, stats_node_index;
682  snat_hairpin_src_next_t next_index;
683  u32 pkts_processed = 0;
684  snat_main_t *sm = &snat_main;
685 
686  stats_node_index = is_ed ? sm->ed_hairpin_src_node_index :
688 
689  from = vlib_frame_vector_args (frame);
690  n_left_from = frame->n_vectors;
691  next_index = node->cached_next_index;
692 
693  while (n_left_from > 0)
694  {
695  u32 n_left_to_next;
696 
697  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
698 
699  while (n_left_from > 0 && n_left_to_next > 0)
700  {
701  u32 bi0;
702  vlib_buffer_t *b0;
703  u32 next0;
705  u32 sw_if_index0;
706 
707  /* speculatively enqueue b0 to the current next frame */
708  bi0 = from[0];
709  to_next[0] = bi0;
710  from += 1;
711  to_next += 1;
712  n_left_from -= 1;
713  n_left_to_next -= 1;
714 
715  b0 = vlib_get_buffer (vm, bi0);
716  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
717  vnet_feature_next (&next0, b0);
718 
719  /* *INDENT-OFF* */
721  ({
722  /* Only packets from NAT inside interface */
723  if ((nat_interface_is_inside(i)) && (sw_if_index0 == i->sw_if_index))
724  {
725  if (PREDICT_FALSE ((vnet_buffer (b0)->snat.flags) &
726  SNAT_FLAG_HAIRPINNING))
727  {
728  if (PREDICT_TRUE (sm->num_workers > 1))
729  next0 = SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH;
730  else
731  next0 = SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT;
732  }
733  break;
734  }
735  }));
736  /* *INDENT-ON* */
737 
738  pkts_processed += next0 != SNAT_HAIRPIN_SRC_NEXT_DROP;
739 
740  /* verify speculative enqueue, maybe switch current next frame */
741  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
742  to_next, n_left_to_next,
743  bi0, next0);
744  }
745 
746  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
747  }
748 
749  vlib_node_increment_counter (vm, stats_node_index,
750  NAT44_HAIRPIN_ERROR_PROCESSED, pkts_processed);
751  return frame->n_vectors;
752 }
753 
757 {
758  return snat_hairpin_src_fn_inline (vm, node, frame, 0);
759 }
760 
761 /* *INDENT-OFF* */
763  .name = "nat44-hairpin-src",
764  .vector_size = sizeof (u32),
767  .error_strings = nat44_hairpin_error_strings,
768  .n_next_nodes = SNAT_HAIRPIN_SRC_N_NEXT,
769  .next_nodes = {
770  [SNAT_HAIRPIN_SRC_NEXT_DROP] = "error-drop",
771  [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT] = "nat44-in2out-output",
772  [SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT] = "interface-output",
773  [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH] = "nat44-in2out-output-worker-handoff",
774  },
775 };
776 /* *INDENT-ON* */
777 
781 {
782  return snat_hairpin_src_fn_inline (vm, node, frame, 1);
783 }
784 
785 /* *INDENT-OFF* */
787  .name = "nat44-ed-hairpin-src",
788  .vector_size = sizeof (u32),
791  .error_strings = nat44_hairpin_error_strings,
792  .n_next_nodes = SNAT_HAIRPIN_SRC_N_NEXT,
793  .next_nodes = {
794  [SNAT_HAIRPIN_SRC_NEXT_DROP] = "error-drop",
795  [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT] = "nat44-ed-in2out-output",
796  [SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT] = "interface-output",
797  [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH] = "nat44-in2out-output-worker-handoff",
798  },
799 };
800 /* *INDENT-ON* */
801 
802 /*
803  * fd.io coding-style-patch-verification: ON
804  *
805  * Local Variables:
806  * eval: (c-set-style "gnu")
807  * End:
808  */
vnet_config_main_t config_main
Definition: feature.h:82
u32 hairpin_dst_node_index
Definition: nat.h:613
u32 ed_hairpinning_node_index
Definition: nat.h:615
vlib_node_registration_t snat_hairpin_src_node
(constructor) VLIB_REGISTER_NODE (snat_hairpin_src_node)
ip4_address_t src_address
Definition: ip4_packet.h:170
vlib_node_registration_t nat44_ed_hairpinning_node
(constructor) VLIB_REGISTER_NODE (nat44_ed_hairpinning_node)
#define PREDICT_TRUE(x)
Definition: clib.h:119
vlib_node_registration_t nat44_ed_hairpin_dst_node
(constructor) VLIB_REGISTER_NODE (nat44_ed_hairpin_dst_node)
vlib_node_registration_t nat44_ed_hairpin_src_node
(constructor) VLIB_REGISTER_NODE (nat44_ed_hairpin_src_node)
static void make_sm_kv(clib_bihash_kv_8_8_t *kv, ip4_address_t *addr, u8 proto, u32 fib_index, u16 port)
Definition: nat_inlines.h:489
u16 port_per_thread
Definition: nat.h:532
static char * nat44_hairpin_error_strings[]
uword ip_csum_t
Definition: ip_packet.h:244
#define VLIB_NODE_FN(node)
Definition: node.h:202
struct _tcp_header tcp_header_t
unsigned char u8
Definition: types.h:56
#define fm
u16 src_port
Definition: udp.api:41
vl_api_ip_proto_t protocol
Definition: lb_types.api:71
snat_get_worker_out2in_function_t * worker_out2in_cb
Definition: nat.h:531
#define static_always_inline
Definition: clib.h:106
#define pool_foreach(VAR, POOL, BODY)
Iterate through pool.
Definition: pool.h:513
static nat_protocol_t ip_proto_to_nat_proto(u8 ip_proto)
Common NAT inline functions.
Definition: inlines.h:22
vl_api_interface_index_t sw_if_index
Definition: gre.api:53
#define foreach_nat44_hairpin_error
nat44_hairpin_error_t
ip4_address_t dst_address
Definition: ip4_packet.h:170
static_always_inline u8 icmp_type_is_error_message(u8 icmp_type)
Definition: inlines.h:53
static void * ip4_next_header(ip4_header_t *i)
Definition: ip4_packet.h:241
unsigned int u32
Definition: types.h:88
ip4_address_t local_addr
Definition: nat.h:399
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:2741
void nat_hairpinning_sm_unknown_proto(snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip)
vl_api_fib_path_type_t type
Definition: fib_types.api:123
static uword snat_hairpin_dst_fn_inline(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, int is_ed)
vnet_crypto_main_t * cm
Definition: quic_crypto.c:53
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:534
nat_hairpin_next_t
clib_bihash_16_8_t out2in_ed
Definition: nat.h:457
u64 key
the key
Definition: bihash_8_8.h:41
unsigned short u16
Definition: types.h:57
u16 protocol
Definition: nat.h:80
snat_static_mapping_t * static_mappings
Definition: nat.h:545
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:229
static void * vnet_get_config_data(vnet_config_main_t *cm, u32 *config_index, u32 *next_index, u32 n_data_bytes)
Definition: config.h:123
#define PREDICT_FALSE(x)
Definition: clib.h:118
u32 hairpin_src_node_index
Definition: nat.h:614
clib_bihash_8_8_t static_mapping_by_external
Definition: nat.h:542
vl_api_address_union_t src_address
Definition: ip_types.api:99
#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:224
#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
vlib_main_t * vm
Definition: in2out_ed.c:1599
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1150
snat_interface_t * output_feature_interfaces
Definition: nat.h:549
snat_main_t snat_main
Definition: nat.c:41
u16 src_port
Definition: nat.h:1425
u32 ed_hairpin_src_node_index
Definition: nat.h:617
u64 value
the value
Definition: bihash_8_8.h:42
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
u16 n_vectors
Definition: node.h:399
clib_bihash_8_8_t out2in
Definition: nat.h:453
vlib_node_registration_t snat_hairpin_dst_node
(constructor) VLIB_REGISTER_NODE (snat_hairpin_dst_node)
sll srl srl sll sra u16x4 i
Definition: vector_sse42.h:317
static_always_inline void vnet_feature_next(u32 *next0, vlib_buffer_t *b0)
Definition: feature.h:322
u32 outside_fib_index
Definition: nat.h:643
u32 current_config_index
Used by feature subgraph arcs to visit enabled feature nodes.
Definition: buffer.h:147
8 octet key, 8 octet key value pair
Definition: bihash_8_8.h:39
#define ARRAY_LEN(x)
Definition: clib.h:66
ip4_address_t addr
Definition: nat.h:78
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:483
u32 ed_hairpin_dst_node_index
Definition: nat.h:616
vlib_main_t vlib_node_runtime_t * node
Definition: in2out_ed.c:1599
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:517
u8 value
Definition: qos.api:54
u32 num_workers
Definition: nat.h:527
snat_hairpin_src_next_t
ip4_address_t addr
Definition: nat.h:314
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)
u16 dst_port
Definition: nat.h:1425
Definition: defs.h:47
vl_api_address_t ip
Definition: l2.api:501
u32 hairpinning_node_index
Definition: nat.h:612
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:536
#define SNAT_FLAG_HAIRPINNING
Definition: nat.h:49
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:294
static uword nat44_hairpinning_fn_inline(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, int is_ed)
snat_address_t * addresses
Definition: nat.h:552
struct _vnet_feature_arc_registration vnet_feature_arc_registration_t
feature registration object
#define vnet_buffer(b)
Definition: buffer.h:417
static uword snat_hairpin_src_fn_inline(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, int is_ed)
#define vec_foreach(var, vec)
Vector iterator.
vlib_main_t vlib_node_runtime_t vlib_frame_t * frame
Definition: in2out_ed.c:1600
vlib_node_registration_t nat44_hairpinning_node
(constructor) VLIB_REGISTER_NODE (nat44_hairpinning_node)
u8 si
Definition: lisp_types.api:47
vnet_feature_config_main_t * feature_config_mains
feature config main objects
Definition: feature.h:100
vnet_feature_main_t feature_main
Definition: feature.c:19
vnet_feature_arc_registration_t vnet_feat_arc_ip4_local
snat_session_t * sessions
Definition: nat.h:467
static_always_inline int is_hairpinning(snat_main_t *sm, ip4_address_t *dst_addr)
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
static void make_ed_kv(ip4_address_t *l_addr, ip4_address_t *r_addr, u8 proto, u32 fib_index, u16 l_port, u16 r_port, u64 value, clib_bihash_kv_16_8_t *kv)
Definition: nat_inlines.h:447
static u16 ip_csum_fold(ip_csum_t c)
Definition: ip_packet.h:300
Definition: defs.h:46
u16 fib_index
Definition: nat.h:80
void nat44_ed_hairpinning_unknown_proto(snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip)
u32 snat_icmp_hairpinning(snat_main_t *sm, vlib_buffer_t *b0, ip4_header_t *ip0, icmp46_header_t *icmp0, int is_ed)