FD.io VPP  v21.01.1
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 typedef struct
43 {
49 
50 static u8 *
51 format_nat_hairpin_trace (u8 * s, va_list * args)
52 {
53  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
54  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
55  nat_hairpin_trace_t *t = va_arg (*args, nat_hairpin_trace_t *);
56 
57  s =
58  format (s, "new dst addr %U port %u fib-index %u", format_ip4_address,
59  &t->addr, clib_net_to_host_u16 (t->port), t->fib_index);
60  if (~0 == t->session_index)
61  {
62  s = format (s, " is-static-mapping");
63  }
64  else
65  {
66  s = format (s, " session-index %u", t->session_index);
67  }
68 
69  return s;
70 }
71 
73 
76 {
77  snat_address_t *ap;
79 
80  /* *INDENT-OFF* */
81  vec_foreach (ap, sm->addresses)
82  {
83  if (ap->addr.as_u32 == dst_addr->as_u32)
84  return 1;
85  }
86  /* *INDENT-ON* */
87 
88  init_nat_k (&kv, *dst_addr, 0, 0, 0);
89  if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
90  return 1;
91 
92  return 0;
93 }
94 
95 #ifndef CLIB_MARCH_VARIANT
96 int
98  snat_main_t * sm, vlib_buffer_t * b0, ip4_header_t * ip0,
99  udp_header_t * udp0, tcp_header_t * tcp0, u32 proto0,
100  int is_ed, int do_trace)
101 {
102  snat_session_t *s0 = NULL;
103  clib_bihash_kv_8_8_t kv0, value0;
104  ip_csum_t sum0;
105  u32 new_dst_addr0 = 0, old_dst_addr0, ti = 0, si = ~0;
106  u16 new_dst_port0 = ~0, old_dst_port0;
107  int rv;
108  ip4_address_t sm0_addr;
109  u16 sm0_port;
110  u32 sm0_fib_index;
111  u32 old_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX];
112  /* Check if destination is static mappings */
114  (sm, ip0->dst_address, udp0->dst_port, sm->outside_fib_index, proto0,
115  &sm0_addr, &sm0_port, &sm0_fib_index, 1, 0, 0, 0, 0, 0, 0))
116  {
117  new_dst_addr0 = sm0_addr.as_u32;
118  new_dst_port0 = sm0_port;
119  vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0_fib_index;
120  }
121  /* or active session */
122  else
123  {
124  if (sm->num_workers > 1)
125  ti =
126  (clib_net_to_host_u16 (udp0->dst_port) -
127  1024) / sm->port_per_thread;
128  else
129  ti = sm->num_workers;
130 
131  if (is_ed)
132  {
133  clib_bihash_kv_16_8_t ed_kv, ed_value;
134  init_ed_k (&ed_kv, ip0->dst_address, udp0->dst_port,
135  ip0->src_address, udp0->src_port, sm->outside_fib_index,
136  ip0->protocol);
137  rv = clib_bihash_search_16_8 (&sm->out2in_ed, &ed_kv, &ed_value);
138  ASSERT (ti == ed_value_get_thread_index (&ed_value));
139  si = ed_value_get_session_index (&ed_value);
140  }
141  else
142  {
143 
144  init_nat_k (&kv0, ip0->dst_address, udp0->dst_port,
145  sm->outside_fib_index, proto0);
146  rv =
147  clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0,
148  &value0);
149  si = value0.value;
150  }
151  if (rv)
152  {
153  rv = 0;
154  goto trace;
155  }
156 
158  new_dst_addr0 = s0->in2out.addr.as_u32;
159  new_dst_port0 = s0->in2out.port;
160  vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
161  }
162 
163  /* Check if anything has changed and if not, then return 0. This
164  helps avoid infinite loop, repeating the three nodes
165  nat44-hairpinning-->ip4-lookup-->ip4-local, in case nothing has
166  changed. */
167  old_dst_addr0 = ip0->dst_address.as_u32;
168  old_dst_port0 = tcp0->dst;
169  if (new_dst_addr0 == old_dst_addr0
170  && new_dst_port0 == old_dst_port0
171  && vnet_buffer (b0)->sw_if_index[VLIB_TX] == old_sw_if_index)
172  return 0;
173 
174  /* Destination is behind the same NAT, use internal address and port */
175  if (new_dst_addr0)
176  {
177  old_dst_addr0 = ip0->dst_address.as_u32;
178  ip0->dst_address.as_u32 = new_dst_addr0;
179  sum0 = ip0->checksum;
180  sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
181  ip4_header_t, dst_address);
182  ip0->checksum = ip_csum_fold (sum0);
183 
184  old_dst_port0 = tcp0->dst;
185  if (PREDICT_TRUE (new_dst_port0 != old_dst_port0))
186  {
187  if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
188  {
189  tcp0->dst = new_dst_port0;
190  sum0 = tcp0->checksum;
191  sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
192  ip4_header_t, dst_address);
193  sum0 = ip_csum_update (sum0, old_dst_port0, new_dst_port0,
194  ip4_header_t /* cheat */ , length);
195  tcp0->checksum = ip_csum_fold (sum0);
196  }
197  else
198  {
199  udp0->dst_port = new_dst_port0;
200  udp0->checksum = 0;
201  }
202  }
203  else
204  {
205  if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
206  {
207  sum0 = tcp0->checksum;
208  sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
209  ip4_header_t, dst_address);
210  tcp0->checksum = ip_csum_fold (sum0);
211  }
212  }
213  rv = 1;
214  goto trace;
215  }
216  rv = 0;
217 trace:
218  if (do_trace && PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
219  && (b0->flags & VLIB_BUFFER_IS_TRACED)))
220  {
221  nat_hairpin_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
222  t->addr.as_u32 = new_dst_addr0;
223  t->port = new_dst_port0;
224  t->fib_index = vnet_buffer (b0)->sw_if_index[VLIB_TX];
225  if (s0)
226  {
227  t->session_index = si;
228  }
229  else
230  {
231  t->session_index = ~0;
232  }
233  }
234  return rv;
235 }
236 #endif
237 
238 #ifndef CLIB_MARCH_VARIANT
239 u32
241  vlib_buffer_t * b0,
242  ip4_header_t * ip0, icmp46_header_t * icmp0, int is_ed)
243 {
244  clib_bihash_kv_8_8_t kv0, value0;
245  u32 old_dst_addr0, new_dst_addr0;
246  u32 old_addr0, new_addr0;
247  u16 old_port0, new_port0;
248  u16 old_checksum0, new_checksum0;
249  u32 si, ti = 0;
250  ip_csum_t sum0;
251  snat_session_t *s0;
253 
255  (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags))
256  {
257  ip4_header_t *inner_ip0 = 0;
258  tcp_udp_header_t *l4_header = 0;
259 
260  inner_ip0 = (ip4_header_t *) ((icmp_echo_header_t *) (icmp0 + 1) + 1);
261  l4_header = ip4_next_header (inner_ip0);
263 
264  if (protocol != NAT_PROTOCOL_TCP && protocol != NAT_PROTOCOL_UDP)
265  return 1;
266 
267  if (is_ed)
268  {
269  clib_bihash_kv_16_8_t ed_kv, ed_value;
270  init_ed_k (&ed_kv, ip0->dst_address, l4_header->src_port,
271  ip0->src_address, l4_header->dst_port,
272  sm->outside_fib_index, inner_ip0->protocol);
273  if (clib_bihash_search_16_8 (&sm->out2in_ed, &ed_kv, &ed_value))
274  return 1;
275  ASSERT (ti == ed_value_get_thread_index (&ed_value));
276  si = ed_value_get_session_index (&ed_value);
277  }
278  else
279  {
280  init_nat_k (&kv0, ip0->dst_address, l4_header->src_port,
281  sm->outside_fib_index, protocol);
282  if (clib_bihash_search_8_8
283  (&sm->per_thread_data[ti].out2in, &kv0, &value0))
284  return 1;
285  si = value0.value;
286  }
287  s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
288  new_dst_addr0 = s0->in2out.addr.as_u32;
289  vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
290 
291  /* update inner source IP address */
292  old_addr0 = inner_ip0->src_address.as_u32;
293  inner_ip0->src_address.as_u32 = new_dst_addr0;
294  new_addr0 = inner_ip0->src_address.as_u32;
295  sum0 = icmp0->checksum;
296  sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
297  src_address);
298  icmp0->checksum = ip_csum_fold (sum0);
299 
300  /* update inner IP header checksum */
301  old_checksum0 = inner_ip0->checksum;
302  sum0 = inner_ip0->checksum;
303  sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
304  src_address);
305  inner_ip0->checksum = ip_csum_fold (sum0);
306  new_checksum0 = inner_ip0->checksum;
307  sum0 = icmp0->checksum;
308  sum0 = ip_csum_update (sum0, old_checksum0, new_checksum0, ip4_header_t,
309  checksum);
310  icmp0->checksum = ip_csum_fold (sum0);
311 
312  /* update inner source port */
313  old_port0 = l4_header->src_port;
314  l4_header->src_port = s0->in2out.port;
315  new_port0 = l4_header->src_port;
316  sum0 = icmp0->checksum;
317  sum0 = ip_csum_update (sum0, old_port0, new_port0, tcp_udp_header_t,
318  src_port);
319  icmp0->checksum = ip_csum_fold (sum0);
320  }
321  else
322  {
323  init_nat_k (&kv0, ip0->dst_address, 0, sm->outside_fib_index, 0);
324  if (clib_bihash_search_8_8
325  (&sm->static_mapping_by_external, &kv0, &value0))
326  {
327  if (!is_ed)
328  {
329  icmp_echo_header_t *echo0 = (icmp_echo_header_t *) (icmp0 + 1);
330  u16 icmp_id0 = echo0->identifier;
331  init_nat_k (&kv0, ip0->dst_address, icmp_id0,
332  sm->outside_fib_index, NAT_PROTOCOL_ICMP);
333  if (sm->num_workers > 1)
334  ti =
335  (clib_net_to_host_u16 (icmp_id0) -
336  1024) / sm->port_per_thread;
337  else
338  ti = sm->num_workers;
339  int rv =
340  clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0,
341  &value0);
342  if (!rv)
343  {
344  si = value0.value;
345  s0 =
347  new_dst_addr0 = s0->in2out.addr.as_u32;
348  vnet_buffer (b0)->sw_if_index[VLIB_TX] =
349  s0->in2out.fib_index;
350  echo0->identifier = s0->in2out.port;
351  sum0 = icmp0->checksum;
352  sum0 = ip_csum_update (sum0, icmp_id0, s0->in2out.port,
353  icmp_echo_header_t, identifier);
354  icmp0->checksum = ip_csum_fold (sum0);
355  goto change_addr;
356  }
357  }
358 
359  return 1;
360  }
361 
362  m0 = pool_elt_at_index (sm->static_mappings, value0.value);
363 
364  new_dst_addr0 = m0->local_addr.as_u32;
365  if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0)
366  vnet_buffer (b0)->sw_if_index[VLIB_TX] = m0->fib_index;
367  }
368 change_addr:
369  /* Destination is behind the same NAT, use internal address and port */
370  if (new_dst_addr0)
371  {
372  old_dst_addr0 = ip0->dst_address.as_u32;
373  ip0->dst_address.as_u32 = new_dst_addr0;
374  sum0 = ip0->checksum;
375  sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
376  ip4_header_t, dst_address);
377  ip0->checksum = ip_csum_fold (sum0);
378  }
379  return 0;
380 }
381 #endif
382 
383 #ifndef CLIB_MARCH_VARIANT
384 void
387 {
390  u32 old_addr, new_addr;
391  ip_csum_t sum;
392 
393  init_nat_k (&kv, ip->dst_address, 0, 0, 0);
394  if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
395  return;
396 
397  m = pool_elt_at_index (sm->static_mappings, value.value);
398 
399  old_addr = ip->dst_address.as_u32;
400  new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
401  sum = ip->checksum;
402  sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
403  ip->checksum = ip_csum_fold (sum);
404 
405  if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
406  vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
407 }
408 #endif
409 
410 #ifndef CLIB_MARCH_VARIANT
411 void
414 {
415  u32 old_addr, new_addr = 0, ti = 0;
417  clib_bihash_kv_16_8_t s_kv, s_value;
419  ip_csum_t sum;
420  snat_session_t *s;
421 
422  if (sm->num_workers > 1)
423  ti = sm->worker_out2in_cb (b, ip, sm->outside_fib_index, 0);
424  else
425  ti = sm->num_workers;
426 
427  old_addr = ip->dst_address.as_u32;
428  init_ed_k (&s_kv, ip->dst_address, 0, ip->src_address, 0,
429  sm->outside_fib_index, ip->protocol);
430  if (clib_bihash_search_16_8 (&sm->out2in_ed, &s_kv, &s_value))
431  {
432  init_nat_k (&kv, ip->dst_address, 0, 0, 0);
433  if (clib_bihash_search_8_8
434  (&sm->static_mapping_by_external, &kv, &value))
435  return;
436 
437  m = pool_elt_at_index (sm->static_mappings, value.value);
438  if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
439  vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
440  new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
441  }
442  else
443  {
444  ASSERT (ti == ed_value_get_thread_index (&s_value));
445  s =
447  ed_value_get_session_index (&s_value));
448  if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
449  vnet_buffer (b)->sw_if_index[VLIB_TX] = s->in2out.fib_index;
450  new_addr = ip->dst_address.as_u32 = s->in2out.addr.as_u32;
451  }
452  sum = ip->checksum;
453  sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
454  ip->checksum = ip_csum_fold (sum);
455 }
456 #endif
457 
458 static inline uword
461  vlib_frame_t * frame, int is_ed)
462 {
463  u32 n_left_from, *from, *to_next;
464  nat_hairpin_next_t next_index;
465  snat_main_t *sm = &snat_main;
467  u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
469 
470  from = vlib_frame_vector_args (frame);
471  n_left_from = frame->n_vectors;
472  next_index = node->cached_next_index;
473 
474  while (n_left_from > 0)
475  {
476  u32 n_left_to_next;
477 
478  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
479 
480  while (n_left_from > 0 && n_left_to_next > 0)
481  {
482  u32 bi0;
483  vlib_buffer_t *b0;
484  u32 next0;
485  ip4_header_t *ip0;
486  u32 proto0;
487  udp_header_t *udp0;
488  tcp_header_t *tcp0;
489  u32 sw_if_index0;
490 
491  /* speculatively enqueue b0 to the current next frame */
492  bi0 = from[0];
493  to_next[0] = bi0;
494  from += 1;
495  to_next += 1;
496  n_left_from -= 1;
497  n_left_to_next -= 1;
498 
499  b0 = vlib_get_buffer (vm, bi0);
500  ip0 = vlib_buffer_get_current (b0);
501  udp0 = ip4_next_header (ip0);
502  tcp0 = (tcp_header_t *) udp0;
503  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
504 
505  proto0 = ip_proto_to_nat_proto (ip0->protocol);
506 
508  &next0, 0);
509 
510  if (snat_hairpinning
511  (vm, node, sm, b0, ip0, udp0, tcp0, proto0, is_ed,
512  1 /* do_trace */ ))
513  next0 = NAT_HAIRPIN_NEXT_LOOKUP;
514 
515  if (next0 != NAT_HAIRPIN_NEXT_DROP)
516  {
518  vm->thread_index, sw_if_index0,
519  1);
520  }
521 
522  /* verify speculative enqueue, maybe switch current next frame */
523  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
524  to_next, n_left_to_next,
525  bi0, next0);
526  }
527 
528  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
529  }
530 
531  return frame->n_vectors;
532 }
533 
537 {
538  return nat44_hairpinning_fn_inline (vm, node, frame, 0);
539 }
540 
541 /* *INDENT-OFF* */
543  .name = "nat44-hairpinning",
544  .vector_size = sizeof (u32),
546  .format_trace = format_nat_hairpin_trace,
547  .n_next_nodes = NAT_HAIRPIN_N_NEXT,
548  .next_nodes = {
549  [NAT_HAIRPIN_NEXT_DROP] = "error-drop",
550  [NAT_HAIRPIN_NEXT_LOOKUP] = "ip4-lookup",
551  },
552 };
553 /* *INDENT-ON* */
554 
558 {
559  return nat44_hairpinning_fn_inline (vm, node, frame, 1);
560 }
561 
562 /* *INDENT-OFF* */
564  .name = "nat44-ed-hairpinning",
565  .vector_size = sizeof (u32),
567  .format_trace = format_nat_hairpin_trace,
568  .n_next_nodes = NAT_HAIRPIN_N_NEXT,
569  .next_nodes = {
570  [NAT_HAIRPIN_NEXT_DROP] = "error-drop",
571  [NAT_HAIRPIN_NEXT_LOOKUP] = "ip4-lookup",
572  },
573 };
574 /* *INDENT-ON* */
575 
576 static inline uword
579  vlib_frame_t * frame, int is_ed)
580 {
581  u32 n_left_from, *from, *to_next;
582  nat_hairpin_next_t next_index;
583  snat_main_t *sm = &snat_main;
584 
585  from = vlib_frame_vector_args (frame);
586  n_left_from = frame->n_vectors;
587  next_index = node->cached_next_index;
588 
589  while (n_left_from > 0)
590  {
591  u32 n_left_to_next;
592 
593  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
594 
595  while (n_left_from > 0 && n_left_to_next > 0)
596  {
597  u32 bi0;
598  vlib_buffer_t *b0;
599  u32 next0;
600  ip4_header_t *ip0;
601  u32 proto0;
602  u32 sw_if_index0;
603 
604  /* speculatively enqueue b0 to the current next frame */
605  bi0 = from[0];
606  to_next[0] = bi0;
607  from += 1;
608  to_next += 1;
609  n_left_from -= 1;
610  n_left_to_next -= 1;
611 
612  b0 = vlib_get_buffer (vm, bi0);
613  next0 = NAT_HAIRPIN_NEXT_LOOKUP;
614  ip0 = vlib_buffer_get_current (b0);
615  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
616 
617  proto0 = ip_proto_to_nat_proto (ip0->protocol);
618 
619  vnet_buffer (b0)->snat.flags = 0;
620  if (PREDICT_FALSE (is_hairpinning (sm, &ip0->dst_address)))
621  {
622  if (proto0 == NAT_PROTOCOL_TCP || proto0 == NAT_PROTOCOL_UDP)
623  {
624  udp_header_t *udp0 = ip4_next_header (ip0);
625  tcp_header_t *tcp0 = (tcp_header_t *) udp0;
626 
627  snat_hairpinning (vm, node, sm, b0, ip0, udp0, tcp0, proto0,
628  is_ed, 1 /* do_trace */ );
629  }
630  else if (proto0 == NAT_PROTOCOL_ICMP)
631  {
632  icmp46_header_t *icmp0 = ip4_next_header (ip0);
633 
634  snat_icmp_hairpinning (sm, b0, ip0, icmp0, is_ed);
635  }
636  else
637  {
638  if (is_ed)
640  else
641  nat_hairpinning_sm_unknown_proto (sm, b0, ip0);
642  }
643 
644  vnet_buffer (b0)->snat.flags = SNAT_FLAG_HAIRPINNING;
645  }
646 
647 
648  if (next0 != NAT_HAIRPIN_NEXT_DROP)
649  {
651  vm->thread_index, sw_if_index0,
652  1);
653  }
654 
655  /* verify speculative enqueue, maybe switch current next frame */
656  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
657  to_next, n_left_to_next,
658  bi0, next0);
659  }
660 
661  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
662  }
663 
664  return frame->n_vectors;
665 }
666 
670 {
671  return snat_hairpin_dst_fn_inline (vm, node, frame, 0);
672 }
673 
674 /* *INDENT-OFF* */
676  .name = "nat44-hairpin-dst",
677  .vector_size = sizeof (u32),
679  .format_trace = format_nat_hairpin_trace,
680  .n_next_nodes = NAT_HAIRPIN_N_NEXT,
681  .next_nodes = {
682  [NAT_HAIRPIN_NEXT_DROP] = "error-drop",
683  [NAT_HAIRPIN_NEXT_LOOKUP] = "ip4-lookup",
684  },
685 };
686 /* *INDENT-ON* */
687 
691 {
692  return snat_hairpin_dst_fn_inline (vm, node, frame, 1);
693 }
694 
695 /* *INDENT-OFF* */
697  .name = "nat44-ed-hairpin-dst",
698  .vector_size = sizeof (u32),
700  .format_trace = format_nat_hairpin_trace,
701  .n_next_nodes = NAT_HAIRPIN_N_NEXT,
702  .next_nodes = {
703  [NAT_HAIRPIN_NEXT_DROP] = "error-drop",
704  [NAT_HAIRPIN_NEXT_LOOKUP] = "ip4-lookup",
705  },
706 };
707 /* *INDENT-ON* */
708 
709 static inline uword
712  vlib_frame_t * frame, int is_ed)
713 {
714  u32 n_left_from, *from, *to_next;
715  snat_hairpin_src_next_t next_index;
716  snat_main_t *sm = &snat_main;
717 
718  from = vlib_frame_vector_args (frame);
719  n_left_from = frame->n_vectors;
720  next_index = node->cached_next_index;
721 
722  while (n_left_from > 0)
723  {
724  u32 n_left_to_next;
725 
726  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
727 
728  while (n_left_from > 0 && n_left_to_next > 0)
729  {
730  u32 bi0;
731  vlib_buffer_t *b0;
732  u32 next0;
734  u32 sw_if_index0;
735 
736  /* speculatively enqueue b0 to the current next frame */
737  bi0 = from[0];
738  to_next[0] = bi0;
739  from += 1;
740  to_next += 1;
741  n_left_from -= 1;
742  n_left_to_next -= 1;
743 
744  b0 = vlib_get_buffer (vm, bi0);
745  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
746  vnet_feature_next (&next0, b0);
747 
748  /* *INDENT-OFF* */
750  {
751  /* Only packets from NAT inside interface */
752  if ((nat_interface_is_inside(i)) && (sw_if_index0 == i->sw_if_index))
753  {
754  if (PREDICT_FALSE ((vnet_buffer (b0)->snat.flags) &
756  {
757  if (PREDICT_TRUE (sm->num_workers > 1))
759  else
761  }
762  break;
763  }
764  }
765  /* *INDENT-ON* */
766 
767  if (next0 != SNAT_HAIRPIN_SRC_NEXT_DROP)
768  {
770  vm->thread_index, sw_if_index0,
771  1);
772  }
773 
774  /* verify speculative enqueue, maybe switch current next frame */
775  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
776  to_next, n_left_to_next,
777  bi0, next0);
778  }
779 
780  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
781  }
782 
783  return frame->n_vectors;
784 }
785 
789 {
790  return snat_hairpin_src_fn_inline (vm, node, frame, 0);
791 }
792 
793 /* *INDENT-OFF* */
795  .name = "nat44-hairpin-src",
796  .vector_size = sizeof (u32),
798  .n_next_nodes = SNAT_HAIRPIN_SRC_N_NEXT,
799  .next_nodes = {
800  [SNAT_HAIRPIN_SRC_NEXT_DROP] = "error-drop",
801  [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT] = "nat44-in2out-output",
802  [SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT] = "interface-output",
803  [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH] = "nat44-in2out-output-worker-handoff",
804  },
805 };
806 /* *INDENT-ON* */
807 
811 {
812  return snat_hairpin_src_fn_inline (vm, node, frame, 1);
813 }
814 
815 /* *INDENT-OFF* */
817  .name = "nat44-ed-hairpin-src",
818  .vector_size = sizeof (u32),
820  .n_next_nodes = SNAT_HAIRPIN_SRC_N_NEXT,
821  .next_nodes = {
822  [SNAT_HAIRPIN_SRC_NEXT_DROP] = "error-drop",
823  [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT] = "nat44-ed-in2out-output",
824  [SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT] = "interface-output",
825  [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH] = "nat44-in2out-output-worker-handoff",
826  },
827 };
828 /* *INDENT-ON* */
829 
830 /*
831  * fd.io coding-style-patch-verification: ON
832  *
833  * Local Variables:
834  * eval: (c-set-style "gnu")
835  * End:
836  */
vnet_config_main_t config_main
Definition: feature.h:82
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
static vlib_cli_command_t trace
(constructor) VLIB_CLI_COMMAND (trace)
Definition: vlib_api_cli.c:899
clib_bihash_16_8_t out2in_ed
Definition: nat.h:541
#define CLIB_UNUSED(x)
Definition: clib.h:87
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:125
vlib_node_registration_t nat44_ed_hairpinning_node
(constructor) VLIB_REGISTER_NODE (nat44_ed_hairpinning_node)
#define pool_foreach(VAR, POOL)
Iterate through pool.
Definition: pool.h:527
#define PREDICT_TRUE(x)
Definition: clib.h:122
vlib_node_registration_t nat44_ed_hairpin_dst_node
(constructor) VLIB_REGISTER_NODE (nat44_ed_hairpin_dst_node)
vl_api_ip_proto_t protocol
Definition: lb_types.api:72
vlib_node_registration_t nat44_ed_hairpin_src_node
(constructor) VLIB_REGISTER_NODE (nat44_ed_hairpin_src_node)
u16 port_per_thread
Definition: nat.h:526
u32 thread_index
Definition: main.h:250
uword ip_csum_t
Definition: ip_packet.h:246
vlib_main_t * vm
Definition: in2out_ed.c:1580
static void vlib_increment_simple_counter(vlib_simple_counter_main_t *cm, u32 thread_index, u32 index, u64 increment)
Increment a simple counter.
Definition: counter.h:78
#define VLIB_NODE_FN(node)
Definition: node.h:203
static u8 * format_nat_hairpin_trace(u8 *s, va_list *args)
struct _tcp_header tcp_header_t
vlib_simple_counter_main_t hairpinning
Definition: nat.h:712
unsigned char u8
Definition: types.h:56
#define fm
format_function_t format_ip4_address
Definition: format.h:73
snat_get_worker_out2in_function_t * worker_out2in_cb
Definition: nat.h:525
#define static_always_inline
Definition: clib.h:109
static nat_protocol_t ip_proto_to_nat_proto(u8 ip_proto)
Common NAT inline functions.
Definition: inlines.h:24
int snat_static_mapping_match(snat_main_t *sm, ip4_address_t match_addr, u16 match_port, u32 match_fib_index, nat_protocol_t match_protocol, ip4_address_t *mapping_addr, u16 *mapping_port, u32 *mapping_fib_index, 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, snat_static_mapping_t **out)
Match NAT44 static mapping.
Definition: nat.c:3183
ip4_address_t dst_address
Definition: ip4_packet.h:125
description fragment has unexpected format
Definition: map.api:433
static_always_inline u8 icmp_type_is_error_message(u8 icmp_type)
Definition: inlines.h:55
const cJSON *const b
Definition: cJSON.h:255
static void * ip4_next_header(ip4_header_t *i)
Definition: ip4_packet.h:196
unsigned int u32
Definition: types.h:88
ip4_address_t local_addr
Definition: nat.h:384
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:546
nat_hairpin_next_t
unsigned short u16
Definition: types.h:57
static u32 ed_value_get_session_index(clib_bihash_kv_16_8_t *value)
Definition: nat_inlines.h:482
snat_static_mapping_t * static_mappings
Definition: nat.h:538
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:233
struct snat_main_s::@91 counters
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:121
clib_bihash_8_8_t static_mapping_by_external
Definition: nat.h:535
#define nat_interface_is_inside(i)
Check if NAT interface is inside.
Definition: nat.h:834
vl_api_address_union_t src_address
Definition: ip_types.api:122
#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:391
static void init_nat_k(clib_bihash_kv_8_8_t *kv, ip4_address_t addr, u16 port, u32 fib_index, nat_protocol_t proto)
Definition: nat_inlines.h:58
snat_interface_t * output_feature_interfaces
Definition: nat.h:545
snat_main_t snat_main
Definition: nat.c:39
u16 src_port
Definition: det44.h:74
vl_api_ip_port_and_mask_t src_port
Definition: flow_types.api:91
u64 value
the value
Definition: bihash_8_8.h:44
vl_api_mac_address_t dst_addr
Definition: flow_types.api:65
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:170
u16 n_vectors
Definition: node.h:397
clib_bihash_8_8_t out2in
Definition: nat.h:440
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:649
int snat_hairpinning(vlib_main_t *vm, vlib_node_runtime_t *node, 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, int do_trace)
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:41
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 sw_if_index
Definition: nat.h:414
vlib_main_t vlib_node_runtime_t * node
Definition: in2out_ed.c:1580
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:511
u8 value
Definition: qos.api:54
#define ASSERT(truth)
u32 num_workers
Definition: nat.h:521
snat_hairpin_src_next_t
char const int length
Definition: cJSON.h:163
ip4_address_t addr
Definition: nat.h:321
u16 dst_port
Definition: det44.h:74
Definition: defs.h:47
vl_api_address_t ip
Definition: l2.api:501
vlib_main_t vlib_node_runtime_t vlib_frame_t * frame
Definition: in2out_ed.c:1581
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:529
#define SNAT_FLAG_HAIRPINNING
Definition: nat.h:43
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:297
#define ip_csum_update(sum, old, new, type, field)
Definition: ip_packet.h:296
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:548
struct _vnet_feature_arc_registration vnet_feature_arc_registration_t
feature registration object
static void init_ed_k(clib_bihash_kv_16_8_t *kv, ip4_address_t l_addr, u16 l_port, ip4_address_t r_addr, u16 r_port, u32 fib_index, u8 proto)
Definition: nat_inlines.h:458
#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.
u16 flags
Copy of main node flags.
Definition: node.h:501
void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace.c:634
vlib_node_registration_t nat44_hairpinning_node
(constructor) VLIB_REGISTER_NODE (nat44_hairpinning_node)
u8 si
Definition: lisp_types.api:47
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:302
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:18
vnet_feature_arc_registration_t vnet_feat_arc_ip4_local
snat_session_t * sessions
Definition: nat.h:453
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 u32 ed_value_get_thread_index(clib_bihash_kv_16_8_t *value)
Definition: nat_inlines.h:476
static u16 ip_csum_fold(ip_csum_t c)
Definition: ip_packet.h:302
vl_api_interface_index_t sw_if_index
Definition: wireguard.api:34
Definition: defs.h:46
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)