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_type_is_error_message
121 (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags))
123 protocol = SNAT_PROTOCOL_ICMP;
124 key0.ext_host_addr = ip0->src_address;
125 key0.ext_host_port = 0;
126 key0.out_port = vnet_buffer (b0)->ip.reass.l4_src_port;
127 out_addr = ip0->dst_address;
131 /* if error message, then it's not fragmented and we can access it */
132 inner_ip0 = (ip4_header_t *) (echo0 + 1);
133 l4_header = ip4_next_header (inner_ip0);
134 protocol = ip_proto_to_snat_proto (inner_ip0->protocol);
135 key0.ext_host_addr = inner_ip0->dst_address;
136 out_addr = inner_ip0->src_address;
139 case SNAT_PROTOCOL_ICMP:
140 inner_icmp0 = (icmp46_header_t *) l4_header;
141 inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
142 key0.ext_host_port = 0;
143 key0.out_port = inner_echo0->identifier;
145 case SNAT_PROTOCOL_UDP:
146 case SNAT_PROTOCOL_TCP:
147 key0.ext_host_port = ((tcp_udp_header_t *) l4_header)->dst_port;
148 key0.out_port = ((tcp_udp_header_t *) l4_header)->src_port;
151 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
152 next0 = NAT_DET_OUT2IN_NEXT_DROP;
157 dm0 = snat_det_map_by_out (sm, &out_addr);
158 if (PREDICT_FALSE (!dm0))
160 /* Don't NAT packet aimed at the intfc address */
161 if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index0,
162 ip0->dst_address.as_u32)))
167 nat_log_info ("unknown dst address: %U",
168 format_ip4_address, &ip0->dst_address);
172 snat_det_reverse (dm0, &ip0->dst_address,
173 clib_net_to_host_u16 (key0.out_port), &new_addr0);
175 ses0 = snat_det_get_ses_by_out (dm0, &new_addr0, key0.as_u64);
176 if (PREDICT_FALSE (!ses0))
178 /* Don't NAT packet aimed at the intfc address */
179 if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index0,
180 ip0->dst_address.as_u32)))
185 nat_log_info ("no match src %U:%d dst %U:%d for user %U",
186 format_ip4_address, &key0.ext_host_addr,
187 clib_net_to_host_u16 (key0.ext_host_port),
188 format_ip4_address, &out_addr,
189 clib_net_to_host_u16 (key0.out_port),
190 format_ip4_address, &new_addr0);
191 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
192 next0 = NAT_DET_OUT2IN_NEXT_DROP;
197 (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_reply
198 && !icmp_type_is_error_message (vnet_buffer (b0)->ip.
199 reass.icmp_type_or_tcp_flags)))
201 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_BAD_ICMP_TYPE];
202 next0 = NAT_DET_OUT2IN_NEXT_DROP;
212 p_value->addr = new_addr0;
213 p_value->fib_index = sm->inside_fib_index;
214 p_value->port = ses0->in_port;
216 *p_dont_translate = dont_translate;
218 *(snat_det_session_t **) d = ses0;
220 *(snat_det_map_t **) e = dm0;
225 VLIB_NODE_FN (snat_det_out2in_node) (vlib_main_t * vm,
226 vlib_node_runtime_t * node,
227 vlib_frame_t * frame)
229 u32 n_left_from, *from, *to_next;
230 nat_det_out2in_next_t next_index;
231 u32 pkts_processed = 0;
232 snat_main_t *sm = &snat_main;
233 u32 thread_index = vm->thread_index;
235 from = vlib_frame_vector_args (frame);
236 n_left_from = frame->n_vectors;
237 next_index = node->cached_next_index;
239 while (n_left_from > 0)
243 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
245 while (n_left_from >= 4 && n_left_to_next >= 2)
248 vlib_buffer_t *b0, *b1;
249 u32 next0 = NAT_DET_OUT2IN_NEXT_LOOKUP;
250 u32 next1 = NAT_DET_OUT2IN_NEXT_LOOKUP;
251 u32 sw_if_index0, sw_if_index1;
252 ip4_header_t *ip0, *ip1;
253 ip_csum_t sum0, sum1;
254 ip4_address_t new_addr0, old_addr0, new_addr1, old_addr1;
255 u16 new_port0, old_port0, old_port1, new_port1;
256 udp_header_t *udp0, *udp1;
257 tcp_header_t *tcp0, *tcp1;
259 snat_det_out_key_t key0, key1;
260 snat_det_map_t *dm0, *dm1;
261 snat_det_session_t *ses0 = 0, *ses1 = 0;
262 u32 rx_fib_index0, rx_fib_index1;
263 icmp46_header_t *icmp0, *icmp1;
265 /* Prefetch next iteration. */
267 vlib_buffer_t *p2, *p3;
269 p2 = vlib_get_buffer (vm, from[2]);
270 p3 = vlib_get_buffer (vm, from[3]);
272 vlib_prefetch_buffer_header (p2, LOAD);
273 vlib_prefetch_buffer_header (p3, LOAD);
275 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
276 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
279 /* speculatively enqueue b0 and b1 to the current next frame */
280 to_next[0] = bi0 = from[0];
281 to_next[1] = bi1 = from[1];
287 b0 = vlib_get_buffer (vm, bi0);
288 b1 = vlib_get_buffer (vm, bi1);
290 ip0 = vlib_buffer_get_current (b0);
291 udp0 = ip4_next_header (ip0);
292 tcp0 = (tcp_header_t *) udp0;
294 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
296 if (PREDICT_FALSE (ip0->ttl == 1))
298 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
299 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
300 ICMP4_time_exceeded_ttl_exceeded_in_transit,
302 next0 = NAT_DET_OUT2IN_NEXT_ICMP_ERROR;
306 proto0 = ip_proto_to_snat_proto (ip0->protocol);
308 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
311 ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
312 icmp0 = (icmp46_header_t *) udp0;
314 next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0,
315 rx_fib_index0, node, next0, thread_index,
320 key0.ext_host_addr = ip0->src_address;
321 key0.ext_host_port = tcp0->src;
322 key0.out_port = tcp0->dst;
324 dm0 = snat_det_map_by_out (sm, &ip0->dst_address);
325 if (PREDICT_FALSE (!dm0))
327 nat_log_info ("unknown dst address: %U",
328 format_ip4_address, &ip0->dst_address);
329 next0 = NAT_DET_OUT2IN_NEXT_DROP;
330 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
334 snat_det_reverse (dm0, &ip0->dst_address,
335 clib_net_to_host_u16 (tcp0->dst), &new_addr0);
337 ses0 = snat_det_get_ses_by_out (dm0, &new_addr0, key0.as_u64);
338 if (PREDICT_FALSE (!ses0))
340 nat_log_info ("no match src %U:%d dst %U:%d for user %U",
341 format_ip4_address, &ip0->src_address,
342 clib_net_to_host_u16 (tcp0->src),
343 format_ip4_address, &ip0->dst_address,
344 clib_net_to_host_u16 (tcp0->dst),
345 format_ip4_address, &new_addr0);
346 next0 = NAT_DET_OUT2IN_NEXT_DROP;
347 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
350 old_port0 = udp0->dst_port;
351 udp0->dst_port = new_port0 = ses0->in_port;
353 old_addr0 = ip0->dst_address;
354 ip0->dst_address = new_addr0;
355 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm->inside_fib_index;
357 sum0 = ip0->checksum;
358 sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
360 dst_address /* changed member */ );
361 ip0->checksum = ip_csum_fold (sum0);
363 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
365 if (tcp0->flags & TCP_FLAG_FIN
366 && ses0->state == SNAT_SESSION_TCP_ESTABLISHED)
367 ses0->state = SNAT_SESSION_TCP_CLOSE_WAIT;
368 else if (tcp0->flags & TCP_FLAG_ACK
369 && ses0->state == SNAT_SESSION_TCP_LAST_ACK)
370 snat_det_ses_close (dm0, ses0);
372 sum0 = tcp0->checksum;
373 sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
375 dst_address /* changed member */ );
376 sum0 = ip_csum_update (sum0, old_port0, new_port0,
377 ip4_header_t /* cheat */ ,
378 length /* changed member */ );
379 tcp0->checksum = ip_csum_fold (sum0);
381 else if (udp0->checksum)
383 sum0 = udp0->checksum;
384 sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
386 dst_address /* changed member */ );
387 sum0 = ip_csum_update (sum0, old_port0, new_port0,
388 ip4_header_t /* cheat */ ,
389 length /* changed member */ );
390 udp0->checksum = ip_csum_fold (sum0);
395 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
396 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
398 nat_det_out2in_trace_t *t =
399 vlib_add_trace (vm, node, b0, sizeof (*t));
400 t->sw_if_index = sw_if_index0;
401 t->next_index = next0;
402 t->session_index = ~0;
404 t->session_index = ses0 - dm0->sessions;
407 pkts_processed += next0 != NAT_DET_OUT2IN_NEXT_DROP;
409 b1 = vlib_get_buffer (vm, bi1);
411 ip1 = vlib_buffer_get_current (b1);
412 udp1 = ip4_next_header (ip1);
413 tcp1 = (tcp_header_t *) udp1;
415 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
417 if (PREDICT_FALSE (ip1->ttl == 1))
419 vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
420 icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
421 ICMP4_time_exceeded_ttl_exceeded_in_transit,
423 next1 = NAT_DET_OUT2IN_NEXT_ICMP_ERROR;
427 proto1 = ip_proto_to_snat_proto (ip1->protocol);
429 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
432 ip4_fib_table_get_index_for_sw_if_index (sw_if_index1);
433 icmp1 = (icmp46_header_t *) udp1;
435 next1 = icmp_out2in (sm, b1, ip1, icmp1, sw_if_index1,
436 rx_fib_index1, node, next1, thread_index,
441 key1.ext_host_addr = ip1->src_address;
442 key1.ext_host_port = tcp1->src;
443 key1.out_port = tcp1->dst;
445 dm1 = snat_det_map_by_out (sm, &ip1->dst_address);
446 if (PREDICT_FALSE (!dm1))
448 nat_log_info ("unknown dst address: %U",
449 format_ip4_address, &ip1->dst_address);
450 next1 = NAT_DET_OUT2IN_NEXT_DROP;
451 b1->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
455 snat_det_reverse (dm1, &ip1->dst_address,
456 clib_net_to_host_u16 (tcp1->dst), &new_addr1);
458 ses1 = snat_det_get_ses_by_out (dm1, &new_addr1, key1.as_u64);
459 if (PREDICT_FALSE (!ses1))
461 nat_log_info ("no match src %U:%d dst %U:%d for user %U",
462 format_ip4_address, &ip1->src_address,
463 clib_net_to_host_u16 (tcp1->src),
464 format_ip4_address, &ip1->dst_address,
465 clib_net_to_host_u16 (tcp1->dst),
466 format_ip4_address, &new_addr1);
467 next1 = NAT_DET_OUT2IN_NEXT_DROP;
468 b1->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
471 old_port1 = udp1->dst_port;
472 udp1->dst_port = new_port1 = ses1->in_port;
474 old_addr1 = ip1->dst_address;
475 ip1->dst_address = new_addr1;
476 vnet_buffer (b1)->sw_if_index[VLIB_TX] = sm->inside_fib_index;
478 sum1 = ip1->checksum;
479 sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
481 dst_address /* changed member */ );
482 ip1->checksum = ip_csum_fold (sum1);
484 if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
486 if (tcp1->flags & TCP_FLAG_FIN
487 && ses1->state == SNAT_SESSION_TCP_ESTABLISHED)
488 ses1->state = SNAT_SESSION_TCP_CLOSE_WAIT;
489 else if (tcp1->flags & TCP_FLAG_ACK
490 && ses1->state == SNAT_SESSION_TCP_LAST_ACK)
491 snat_det_ses_close (dm1, ses1);
493 sum1 = tcp1->checksum;
494 sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
496 dst_address /* changed member */ );
497 sum1 = ip_csum_update (sum1, old_port1, new_port1,
498 ip4_header_t /* cheat */ ,
499 length /* changed member */ );
500 tcp1->checksum = ip_csum_fold (sum1);
502 else if (udp1->checksum)
504 sum1 = udp1->checksum;
505 sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
507 dst_address /* changed member */ );
508 sum1 = ip_csum_update (sum1, old_port1, new_port1,
509 ip4_header_t /* cheat */ ,
510 length /* changed member */ );
511 udp1->checksum = ip_csum_fold (sum1);
516 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
517 && (b1->flags & VLIB_BUFFER_IS_TRACED)))
519 nat_det_out2in_trace_t *t =
520 vlib_add_trace (vm, node, b1, sizeof (*t));
521 t->sw_if_index = sw_if_index1;
522 t->next_index = next1;
523 t->session_index = ~0;
525 t->session_index = ses1 - dm1->sessions;
528 pkts_processed += next1 != NAT_DET_OUT2IN_NEXT_DROP;
530 /* verify speculative enqueues, maybe switch current next frame */
531 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
532 to_next, n_left_to_next,
533 bi0, bi1, next0, next1);
536 while (n_left_from > 0 && n_left_to_next > 0)
540 u32 next0 = NAT_DET_OUT2IN_NEXT_LOOKUP;
544 ip4_address_t new_addr0, old_addr0;
545 u16 new_port0, old_port0;
549 snat_det_out_key_t key0;
551 snat_det_session_t *ses0 = 0;
553 icmp46_header_t *icmp0;
555 /* speculatively enqueue b0 to the current next frame */
563 b0 = vlib_get_buffer (vm, bi0);
565 ip0 = vlib_buffer_get_current (b0);
566 udp0 = ip4_next_header (ip0);
567 tcp0 = (tcp_header_t *) udp0;
569 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
571 if (PREDICT_FALSE (ip0->ttl == 1))
573 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
574 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
575 ICMP4_time_exceeded_ttl_exceeded_in_transit,
577 next0 = NAT_DET_OUT2IN_NEXT_ICMP_ERROR;
581 proto0 = ip_proto_to_snat_proto (ip0->protocol);
583 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
586 ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
587 icmp0 = (icmp46_header_t *) udp0;
589 next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0,
590 rx_fib_index0, node, next0, thread_index,
595 key0.ext_host_addr = ip0->src_address;
596 key0.ext_host_port = tcp0->src;
597 key0.out_port = tcp0->dst;
599 dm0 = snat_det_map_by_out (sm, &ip0->dst_address);
600 if (PREDICT_FALSE (!dm0))
602 nat_log_info ("unknown dst address: %U",
603 format_ip4_address, &ip0->dst_address);
604 next0 = NAT_DET_OUT2IN_NEXT_DROP;
605 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
609 snat_det_reverse (dm0, &ip0->dst_address,
610 clib_net_to_host_u16 (tcp0->dst), &new_addr0);
612 ses0 = snat_det_get_ses_by_out (dm0, &new_addr0, key0.as_u64);
613 if (PREDICT_FALSE (!ses0))
615 nat_log_info ("no match src %U:%d dst %U:%d for user %U",
616 format_ip4_address, &ip0->src_address,
617 clib_net_to_host_u16 (tcp0->src),
618 format_ip4_address, &ip0->dst_address,
619 clib_net_to_host_u16 (tcp0->dst),
620 format_ip4_address, &new_addr0);
621 next0 = NAT_DET_OUT2IN_NEXT_DROP;
622 b0->error = node->errors[NAT_DET_OUT2IN_ERROR_NO_TRANSLATION];
625 old_port0 = udp0->dst_port;
626 udp0->dst_port = new_port0 = ses0->in_port;
628 old_addr0 = ip0->dst_address;
629 ip0->dst_address = new_addr0;
630 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm->inside_fib_index;
632 sum0 = ip0->checksum;
633 sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
635 dst_address /* changed member */ );
636 ip0->checksum = ip_csum_fold (sum0);
638 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
640 if (tcp0->flags & TCP_FLAG_FIN
641 && ses0->state == SNAT_SESSION_TCP_ESTABLISHED)
642 ses0->state = SNAT_SESSION_TCP_CLOSE_WAIT;
643 else if (tcp0->flags & TCP_FLAG_ACK
644 && ses0->state == SNAT_SESSION_TCP_LAST_ACK)
645 snat_det_ses_close (dm0, ses0);
647 sum0 = tcp0->checksum;
648 sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
650 dst_address /* changed member */ );
651 sum0 = ip_csum_update (sum0, old_port0, new_port0,
652 ip4_header_t /* cheat */ ,
653 length /* changed member */ );
654 tcp0->checksum = ip_csum_fold (sum0);
656 else if (udp0->checksum)
658 sum0 = udp0->checksum;
659 sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
661 dst_address /* changed member */ );
662 sum0 = ip_csum_update (sum0, old_port0, new_port0,
663 ip4_header_t /* cheat */ ,
664 length /* changed member */ );
665 udp0->checksum = ip_csum_fold (sum0);
670 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
671 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
673 nat_det_out2in_trace_t *t =
674 vlib_add_trace (vm, node, b0, sizeof (*t));
675 t->sw_if_index = sw_if_index0;
676 t->next_index = next0;
677 t->session_index = ~0;
679 t->session_index = ses0 - dm0->sessions;
682 pkts_processed += next0 != NAT_DET_OUT2IN_NEXT_DROP;
684 /* verify speculative enqueue, maybe switch current next frame */
685 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
686 to_next, n_left_to_next,
690 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
693 vlib_node_increment_counter (vm, sm->det_out2in_node_index,
694 NAT_DET_OUT2IN_ERROR_OUT2IN_PACKETS,
696 return frame->n_vectors;
700 VLIB_REGISTER_NODE (snat_det_out2in_node) = {
701 .name = "nat44-det-out2in",
702 .vector_size = sizeof (u32),
703 .format_trace = format_nat_det_out2in_trace,
704 .type = VLIB_NODE_TYPE_INTERNAL,
705 .n_errors = ARRAY_LEN(nat_det_out2in_error_strings),
706 .error_strings = nat_det_out2in_error_strings,
707 .runtime_data_bytes = sizeof (snat_runtime_t),
708 .n_next_nodes = NAT_DET_OUT2IN_N_NEXT,
709 /* edit / add dispositions here */
711 [NAT_DET_OUT2IN_NEXT_DROP] = "error-drop",
712 [NAT_DET_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
713 [NAT_DET_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
719 * fd.io coding-style-patch-verification: ON
722 * eval: (c-set-style "gnu")