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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 * @brief Deterministic/CGN NAT44 outside to inside network translation
20 #include <vlib/vlib.h>
21 #include <vnet/vnet.h>
22 #include <vnet/ip/ip.h>
23 #include <vnet/fib/ip4_fib.h>
24 #include <vppinfra/error.h>
25 #include <vppinfra/elog.h>
27 #include <nat/nat_det.h>
28 #include <nat/nat_inlines.h>
32 NAT_DET_OUT2IN_NEXT_DROP,
33 NAT_DET_OUT2IN_NEXT_LOOKUP,
34 NAT_DET_OUT2IN_NEXT_ICMP_ERROR,
35 NAT_DET_OUT2IN_N_NEXT,
36 } nat_det_out2in_next_t;
43 } nat_det_out2in_trace_t;
45 #define foreach_nat_det_out2in_error \
46 _(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
47 _(NO_TRANSLATION, "No translation") \
48 _(BAD_ICMP_TYPE, "unsupported ICMP type") \
49 _(OUT2IN_PACKETS, "Good out2in packets processed")
53 #define _(sym,str) NAT_DET_OUT2IN_ERROR_##sym,
54 foreach_nat_det_out2in_error
57 } nat_det_out2in_error_t;
59 static char *nat_det_out2in_error_strings[] = {
60 #define _(sym,string) string,
61 foreach_nat_det_out2in_error
66 format_nat_det_out2in_trace (u8 * s, va_list * args)
68 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
69 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
70 nat_det_out2in_trace_t *t = va_arg (*args, nat_det_out2in_trace_t *);
74 "NAT_DET_OUT2IN: sw_if_index %d, next index %d, session index %d",
75 t->sw_if_index, t->next_index, t->session_index);
79 #ifndef CLIB_MARCH_VARIANT
81 * Get address and port values to be used for ICMP packet translation
82 * and create session if needed
84 * @param[in,out] sm NAT main
85 * @param[in,out] node NAT node runtime
86 * @param[in] thread_index thread index
87 * @param[in,out] b0 buffer containing packet to be translated
88 * @param[out] p_proto protocol used for matching
89 * @param[out] p_value address and port after NAT translation
90 * @param[out] p_dont_translate if packet should not be translated
91 * @param d optional parameter
92 * @param e optional parameter
95 icmp_match_out2in_det (snat_main_t * sm, vlib_node_runtime_t * node,
96 u32 thread_index, vlib_buffer_t * b0,
97 ip4_header_t * ip0, u8 * p_proto,
98 snat_session_key_t * p_value,
99 u8 * p_dont_translate, void *d, void *e)
101 icmp46_header_t *icmp0;
104 snat_det_out_key_t key0;
105 u8 dont_translate = 0;
107 icmp_echo_header_t *echo0, *inner_echo0 = 0;
108 ip4_header_t *inner_ip0;
110 icmp46_header_t *inner_icmp0;
111 snat_det_map_t *dm0 = 0;
112 ip4_address_t new_addr0 = { {0} };
113 snat_det_session_t *ses0 = 0;
114 ip4_address_t out_addr;
116 icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
117 echo0 = (icmp_echo_header_t *) (icmp0 + 1);
118 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
120 if (!icmp_is_error_message (icmp0))
122 protocol = SNAT_PROTOCOL_ICMP;
123 key0.ext_host_addr = ip0->src_address;
124 key0.ext_host_port = 0;
125 key0.out_port = echo0->identifier;
126 out_addr = ip0->dst_address;
130 inner_ip0 = (ip4_header_t *) (echo0 + 1);
131 l4_header = ip4_next_header (inner_ip0);
132 protocol = ip_proto_to_snat_proto (inner_ip0->protocol);
133 key0.ext_host_addr = inner_ip0->dst_address;
134 out_addr = inner_ip0->src_address;
137 case SNAT_PROTOCOL_ICMP:
138 inner_icmp0 = (icmp46_header_t *) l4_header;
139 inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
140 key0.ext_host_port = 0;
141 key0.out_port = inner_echo0->identifier;
143 case SNAT_PROTOCOL_UDP:
144 case SNAT_PROTOCOL_TCP:
145 key0.ext_host_port = ((tcp_udp_header_t *) l4_header)->dst_port;
146 key0.out_port = ((tcp_udp_header_t *) l4_header)->src_port;
149 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
150 next0 = NAT_DET_OUT2IN_NEXT_DROP;
155 dm0 = snat_det_map_by_out (sm, &out_addr);
156 if (PREDICT_FALSE (!dm0))
158 /* Don't NAT packet aimed at the intfc address */
159 if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index0,
160 ip0->dst_address.as_u32)))
165 nat_log_info ("unknown dst address: %U",
166 format_ip4_address, &ip0->dst_address);
170 snat_det_reverse (dm0, &ip0->dst_address,
171 clib_net_to_host_u16 (key0.out_port), &new_addr0);
173 ses0 = snat_det_get_ses_by_out (dm0, &new_addr0, key0.as_u64);
174 if (PREDICT_FALSE (!ses0))
176 /* Don't NAT packet aimed at the intfc address */
177 if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index0,
178 ip0->dst_address.as_u32)))
183 nat_log_info ("no match src %U:%d dst %U:%d for user %U",
184 format_ip4_address, &key0.ext_host_addr,
185 clib_net_to_host_u16 (key0.ext_host_port),
186 format_ip4_address, &out_addr,
187 clib_net_to_host_u16 (key0.out_port),
188 format_ip4_address, &new_addr0);
189 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
190 next0 = NAT_DET_OUT2IN_NEXT_DROP;
194 if (PREDICT_FALSE (icmp0->type != ICMP4_echo_reply &&
195 !icmp_is_error_message (icmp0)))
197 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_BAD_ICMP_TYPE];
198 next0 = NAT_DET_OUT2IN_NEXT_DROP;
208 p_value->addr = new_addr0;
209 p_value->fib_index = sm->inside_fib_index;
210 p_value->port = ses0->in_port;
212 *p_dont_translate = dont_translate;
214 *(snat_det_session_t **) d = ses0;
216 *(snat_det_map_t **) e = dm0;
221 VLIB_NODE_FN (snat_det_out2in_node) (vlib_main_t * vm,
222 vlib_node_runtime_t * node,
223 vlib_frame_t * frame)
225 u32 n_left_from, *from, *to_next;
226 nat_det_out2in_next_t next_index;
227 u32 pkts_processed = 0;
228 snat_main_t *sm = &snat_main;
229 u32 thread_index = vm->thread_index;
231 from = vlib_frame_vector_args (frame);
232 n_left_from = frame->n_vectors;
233 next_index = node->cached_next_index;
235 while (n_left_from > 0)
239 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
241 while (n_left_from >= 4 && n_left_to_next >= 2)
244 vlib_buffer_t *b0, *b1;
245 u32 next0 = NAT_DET_OUT2IN_NEXT_LOOKUP;
246 u32 next1 = NAT_DET_OUT2IN_NEXT_LOOKUP;
247 u32 sw_if_index0, sw_if_index1;
248 ip4_header_t *ip0, *ip1;
249 ip_csum_t sum0, sum1;
250 ip4_address_t new_addr0, old_addr0, new_addr1, old_addr1;
251 u16 new_port0, old_port0, old_port1, new_port1;
252 udp_header_t *udp0, *udp1;
253 tcp_header_t *tcp0, *tcp1;
255 snat_det_out_key_t key0, key1;
256 snat_det_map_t *dm0, *dm1;
257 snat_det_session_t *ses0 = 0, *ses1 = 0;
258 u32 rx_fib_index0, rx_fib_index1;
259 icmp46_header_t *icmp0, *icmp1;
261 /* Prefetch next iteration. */
263 vlib_buffer_t *p2, *p3;
265 p2 = vlib_get_buffer (vm, from[2]);
266 p3 = vlib_get_buffer (vm, from[3]);
268 vlib_prefetch_buffer_header (p2, LOAD);
269 vlib_prefetch_buffer_header (p3, LOAD);
271 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
272 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
275 /* speculatively enqueue b0 and b1 to the current next frame */
276 to_next[0] = bi0 = from[0];
277 to_next[1] = bi1 = from[1];
283 b0 = vlib_get_buffer (vm, bi0);
284 b1 = vlib_get_buffer (vm, bi1);
286 ip0 = vlib_buffer_get_current (b0);
287 udp0 = ip4_next_header (ip0);
288 tcp0 = (tcp_header_t *) udp0;
290 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
292 if (PREDICT_FALSE (ip0->ttl == 1))
294 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
295 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
296 ICMP4_time_exceeded_ttl_exceeded_in_transit,
298 next0 = NAT_DET_OUT2IN_NEXT_ICMP_ERROR;
302 proto0 = ip_proto_to_snat_proto (ip0->protocol);
304 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
307 ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
308 icmp0 = (icmp46_header_t *) udp0;
310 next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0,
311 rx_fib_index0, node, next0, thread_index,
316 key0.ext_host_addr = ip0->src_address;
317 key0.ext_host_port = tcp0->src;
318 key0.out_port = tcp0->dst;
320 dm0 = snat_det_map_by_out (sm, &ip0->dst_address);
321 if (PREDICT_FALSE (!dm0))
323 nat_log_info ("unknown dst address: %U",
324 format_ip4_address, &ip0->dst_address);
325 next0 = NAT_DET_OUT2IN_NEXT_DROP;
326 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
330 snat_det_reverse (dm0, &ip0->dst_address,
331 clib_net_to_host_u16 (tcp0->dst), &new_addr0);
333 ses0 = snat_det_get_ses_by_out (dm0, &new_addr0, key0.as_u64);
334 if (PREDICT_FALSE (!ses0))
336 nat_log_info ("no match src %U:%d dst %U:%d for user %U",
337 format_ip4_address, &ip0->src_address,
338 clib_net_to_host_u16 (tcp0->src),
339 format_ip4_address, &ip0->dst_address,
340 clib_net_to_host_u16 (tcp0->dst),
341 format_ip4_address, &new_addr0);
342 next0 = NAT_DET_OUT2IN_NEXT_DROP;
343 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
346 old_port0 = udp0->dst_port;
347 udp0->dst_port = new_port0 = ses0->in_port;
349 old_addr0 = ip0->dst_address;
350 ip0->dst_address = new_addr0;
351 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm->inside_fib_index;
353 sum0 = ip0->checksum;
354 sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
356 dst_address /* changed member */ );
357 ip0->checksum = ip_csum_fold (sum0);
359 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
361 if (tcp0->flags & TCP_FLAG_FIN
362 && ses0->state == SNAT_SESSION_TCP_ESTABLISHED)
363 ses0->state = SNAT_SESSION_TCP_CLOSE_WAIT;
364 else if (tcp0->flags & TCP_FLAG_ACK
365 && ses0->state == SNAT_SESSION_TCP_LAST_ACK)
366 snat_det_ses_close (dm0, ses0);
368 sum0 = tcp0->checksum;
369 sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
371 dst_address /* changed member */ );
372 sum0 = ip_csum_update (sum0, old_port0, new_port0,
373 ip4_header_t /* cheat */ ,
374 length /* changed member */ );
375 tcp0->checksum = ip_csum_fold (sum0);
377 else if (udp0->checksum)
379 sum0 = udp0->checksum;
380 sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
382 dst_address /* changed member */ );
383 sum0 = ip_csum_update (sum0, old_port0, new_port0,
384 ip4_header_t /* cheat */ ,
385 length /* changed member */ );
386 udp0->checksum = ip_csum_fold (sum0);
391 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
392 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
394 nat_det_out2in_trace_t *t =
395 vlib_add_trace (vm, node, b0, sizeof (*t));
396 t->sw_if_index = sw_if_index0;
397 t->next_index = next0;
398 t->session_index = ~0;
400 t->session_index = ses0 - dm0->sessions;
403 pkts_processed += next0 != NAT_DET_OUT2IN_NEXT_DROP;
405 b1 = vlib_get_buffer (vm, bi1);
407 ip1 = vlib_buffer_get_current (b1);
408 udp1 = ip4_next_header (ip1);
409 tcp1 = (tcp_header_t *) udp1;
411 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
413 if (PREDICT_FALSE (ip1->ttl == 1))
415 vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
416 icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
417 ICMP4_time_exceeded_ttl_exceeded_in_transit,
419 next1 = NAT_DET_OUT2IN_NEXT_ICMP_ERROR;
423 proto1 = ip_proto_to_snat_proto (ip1->protocol);
425 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
428 ip4_fib_table_get_index_for_sw_if_index (sw_if_index1);
429 icmp1 = (icmp46_header_t *) udp1;
431 next1 = icmp_out2in (sm, b1, ip1, icmp1, sw_if_index1,
432 rx_fib_index1, node, next1, thread_index,
437 key1.ext_host_addr = ip1->src_address;
438 key1.ext_host_port = tcp1->src;
439 key1.out_port = tcp1->dst;
441 dm1 = snat_det_map_by_out (sm, &ip1->dst_address);
442 if (PREDICT_FALSE (!dm1))
444 nat_log_info ("unknown dst address: %U",
445 format_ip4_address, &ip1->dst_address);
446 next1 = NAT_DET_OUT2IN_NEXT_DROP;
447 b1->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
451 snat_det_reverse (dm1, &ip1->dst_address,
452 clib_net_to_host_u16 (tcp1->dst), &new_addr1);
454 ses1 = snat_det_get_ses_by_out (dm1, &new_addr1, key1.as_u64);
455 if (PREDICT_FALSE (!ses1))
457 nat_log_info ("no match src %U:%d dst %U:%d for user %U",
458 format_ip4_address, &ip1->src_address,
459 clib_net_to_host_u16 (tcp1->src),
460 format_ip4_address, &ip1->dst_address,
461 clib_net_to_host_u16 (tcp1->dst),
462 format_ip4_address, &new_addr1);
463 next1 = NAT_DET_OUT2IN_NEXT_DROP;
464 b1->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
467 old_port1 = udp1->dst_port;
468 udp1->dst_port = new_port1 = ses1->in_port;
470 old_addr1 = ip1->dst_address;
471 ip1->dst_address = new_addr1;
472 vnet_buffer (b1)->sw_if_index[VLIB_TX] = sm->inside_fib_index;
474 sum1 = ip1->checksum;
475 sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
477 dst_address /* changed member */ );
478 ip1->checksum = ip_csum_fold (sum1);
480 if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
482 if (tcp1->flags & TCP_FLAG_FIN
483 && ses1->state == SNAT_SESSION_TCP_ESTABLISHED)
484 ses1->state = SNAT_SESSION_TCP_CLOSE_WAIT;
485 else if (tcp1->flags & TCP_FLAG_ACK
486 && ses1->state == SNAT_SESSION_TCP_LAST_ACK)
487 snat_det_ses_close (dm1, ses1);
489 sum1 = tcp1->checksum;
490 sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
492 dst_address /* changed member */ );
493 sum1 = ip_csum_update (sum1, old_port1, new_port1,
494 ip4_header_t /* cheat */ ,
495 length /* changed member */ );
496 tcp1->checksum = ip_csum_fold (sum1);
498 else if (udp1->checksum)
500 sum1 = udp1->checksum;
501 sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
503 dst_address /* changed member */ );
504 sum1 = ip_csum_update (sum1, old_port1, new_port1,
505 ip4_header_t /* cheat */ ,
506 length /* changed member */ );
507 udp1->checksum = ip_csum_fold (sum1);
512 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
513 && (b1->flags & VLIB_BUFFER_IS_TRACED)))
515 nat_det_out2in_trace_t *t =
516 vlib_add_trace (vm, node, b1, sizeof (*t));
517 t->sw_if_index = sw_if_index1;
518 t->next_index = next1;
519 t->session_index = ~0;
521 t->session_index = ses1 - dm1->sessions;
524 pkts_processed += next1 != NAT_DET_OUT2IN_NEXT_DROP;
526 /* verify speculative enqueues, maybe switch current next frame */
527 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
528 to_next, n_left_to_next,
529 bi0, bi1, next0, next1);
532 while (n_left_from > 0 && n_left_to_next > 0)
536 u32 next0 = NAT_DET_OUT2IN_NEXT_LOOKUP;
540 ip4_address_t new_addr0, old_addr0;
541 u16 new_port0, old_port0;
545 snat_det_out_key_t key0;
547 snat_det_session_t *ses0 = 0;
549 icmp46_header_t *icmp0;
551 /* speculatively enqueue b0 to the current next frame */
559 b0 = vlib_get_buffer (vm, bi0);
561 ip0 = vlib_buffer_get_current (b0);
562 udp0 = ip4_next_header (ip0);
563 tcp0 = (tcp_header_t *) udp0;
565 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
567 if (PREDICT_FALSE (ip0->ttl == 1))
569 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
570 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
571 ICMP4_time_exceeded_ttl_exceeded_in_transit,
573 next0 = NAT_DET_OUT2IN_NEXT_ICMP_ERROR;
577 proto0 = ip_proto_to_snat_proto (ip0->protocol);
579 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
582 ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
583 icmp0 = (icmp46_header_t *) udp0;
585 next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0,
586 rx_fib_index0, node, next0, thread_index,
591 key0.ext_host_addr = ip0->src_address;
592 key0.ext_host_port = tcp0->src;
593 key0.out_port = tcp0->dst;
595 dm0 = snat_det_map_by_out (sm, &ip0->dst_address);
596 if (PREDICT_FALSE (!dm0))
598 nat_log_info ("unknown dst address: %U",
599 format_ip4_address, &ip0->dst_address);
600 next0 = NAT_DET_OUT2IN_NEXT_DROP;
601 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
605 snat_det_reverse (dm0, &ip0->dst_address,
606 clib_net_to_host_u16 (tcp0->dst), &new_addr0);
608 ses0 = snat_det_get_ses_by_out (dm0, &new_addr0, key0.as_u64);
609 if (PREDICT_FALSE (!ses0))
611 nat_log_info ("no match src %U:%d dst %U:%d for user %U",
612 format_ip4_address, &ip0->src_address,
613 clib_net_to_host_u16 (tcp0->src),
614 format_ip4_address, &ip0->dst_address,
615 clib_net_to_host_u16 (tcp0->dst),
616 format_ip4_address, &new_addr0);
617 next0 = NAT_DET_OUT2IN_NEXT_DROP;
618 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
621 old_port0 = udp0->dst_port;
622 udp0->dst_port = new_port0 = ses0->in_port;
624 old_addr0 = ip0->dst_address;
625 ip0->dst_address = new_addr0;
626 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm->inside_fib_index;
628 sum0 = ip0->checksum;
629 sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
631 dst_address /* changed member */ );
632 ip0->checksum = ip_csum_fold (sum0);
634 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
636 if (tcp0->flags & TCP_FLAG_FIN
637 && ses0->state == SNAT_SESSION_TCP_ESTABLISHED)
638 ses0->state = SNAT_SESSION_TCP_CLOSE_WAIT;
639 else if (tcp0->flags & TCP_FLAG_ACK
640 && ses0->state == SNAT_SESSION_TCP_LAST_ACK)
641 snat_det_ses_close (dm0, ses0);
643 sum0 = tcp0->checksum;
644 sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
646 dst_address /* changed member */ );
647 sum0 = ip_csum_update (sum0, old_port0, new_port0,
648 ip4_header_t /* cheat */ ,
649 length /* changed member */ );
650 tcp0->checksum = ip_csum_fold (sum0);
652 else if (udp0->checksum)
654 sum0 = udp0->checksum;
655 sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
657 dst_address /* changed member */ );
658 sum0 = ip_csum_update (sum0, old_port0, new_port0,
659 ip4_header_t /* cheat */ ,
660 length /* changed member */ );
661 udp0->checksum = ip_csum_fold (sum0);
666 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
667 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
669 nat_det_out2in_trace_t *t =
670 vlib_add_trace (vm, node, b0, sizeof (*t));
671 t->sw_if_index = sw_if_index0;
672 t->next_index = next0;
673 t->session_index = ~0;
675 t->session_index = ses0 - dm0->sessions;
678 pkts_processed += next0 != NAT_DET_OUT2IN_NEXT_DROP;
680 /* verify speculative enqueue, maybe switch current next frame */
681 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
682 to_next, n_left_to_next,
686 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
689 vlib_node_increment_counter (vm, sm->det_out2in_node_index,
690 NAT_DET_OUT2IN_ERROR_OUT2IN_PACKETS,
692 return frame->n_vectors;
696 VLIB_REGISTER_NODE (snat_det_out2in_node) = {
697 .name = "nat44-det-out2in",
698 .vector_size = sizeof (u32),
699 .format_trace = format_nat_det_out2in_trace,
700 .type = VLIB_NODE_TYPE_INTERNAL,
701 .n_errors = ARRAY_LEN(nat_det_out2in_error_strings),
702 .error_strings = nat_det_out2in_error_strings,
703 .runtime_data_bytes = sizeof (snat_runtime_t),
704 .n_next_nodes = NAT_DET_OUT2IN_N_NEXT,
705 /* edit / add dispositions here */
707 [NAT_DET_OUT2IN_NEXT_DROP] = "error-drop",
708 [NAT_DET_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
709 [NAT_DET_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
715 * fd.io coding-style-patch-verification: ON
718 * eval: (c-set-style "gnu")