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 NAT44 endpoint-dependent outside to inside network translation
20 #include <vlib/vlib.h>
21 #include <vnet/vnet.h>
22 #include <vnet/ip/ip.h>
23 #include <vnet/ethernet/ethernet.h>
24 #include <vnet/fib/ip4_fib.h>
25 #include <vnet/udp/udp_local.h>
26 #include <vppinfra/error.h>
28 #include <nat/lib/nat_syslog.h>
29 #include <nat/lib/ipfix_logging.h>
31 #include <nat/nat44-ed/nat44_ed.h>
32 #include <nat/nat44-ed/nat44_ed_inlines.h>
34 static char *nat_out2in_ed_error_strings[] = {
35 #define _(sym,string) string,
36 foreach_nat_out2in_ed_error
42 NAT_ED_SP_REASON_NO_REASON,
43 NAT_ED_SP_REASON_LOOKUP_FAILED,
44 NAT_ED_SP_REASON_VRF_EXPIRED,
46 NAT_ED_SP_SESS_EXPIRED,
47 } nat_slow_path_reason_e;
54 nat_translation_error_e translation_error;
57 clib_bihash_kv_16_8_t search_key;
59 u8 translation_via_i2of;
61 nat_slow_path_reason_e slow_path_reason;
62 } nat44_ed_out2in_trace_t;
65 format_slow_path_reason (u8 *s, va_list *args)
67 nat_slow_path_reason_e reason = va_arg (*args, nat_slow_path_reason_e);
70 case NAT_ED_SP_REASON_NO_REASON:
71 return format (s, "no reason for slow path");
72 case NAT_ED_SP_REASON_LOOKUP_FAILED:
73 return format (s, "slow path because lookup failed");
74 case NAT_ED_SP_REASON_VRF_EXPIRED:
75 return format (s, "slow path because vrf expired");
76 case NAT_ED_SP_TCP_CLOSED:
77 return format (s, "slow path because tcp closed");
78 case NAT_ED_SP_SESS_EXPIRED:
79 return format (s, "slow path because session expired");
81 return format (s, "invalid reason value");
85 format_nat44_ed_out2in_trace (u8 * s, va_list * args)
87 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
88 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
89 nat44_ed_out2in_trace_t *t = va_arg (*args, nat44_ed_out2in_trace_t *);
93 t->is_slow_path ? "NAT44_OUT2IN_ED_SLOW_PATH" :
94 "NAT44_OUT2IN_ED_FAST_PATH";
96 s = format (s, "%s: sw_if_index %d, next index %d", tag, t->sw_if_index,
98 if (~0 != t->session_index)
100 s = format (s, ", session %d, translation result '%U' via %s",
101 t->session_index, format_nat_ed_translation_error,
102 t->translation_error,
103 t->translation_via_i2of ? "i2of" : "o2if");
104 s = format (s, "\n i2of %U", format_nat_6t_flow, &t->i2of);
105 s = format (s, "\n o2if %U", format_nat_6t_flow, &t->o2if);
107 if (!t->is_slow_path)
109 if (t->lookup_skipped)
111 s = format (s, "\n lookup skipped - cached session index used");
115 s = format (s, "\n search key %U", format_ed_session_kvp,
118 s = format (s, "\n %U", format_slow_path_reason, t->slow_path_reason);
125 next_src_nat (snat_main_t *sm, ip4_header_t *ip, u16 src_port, u16 dst_port,
126 u32 thread_index, u32 rx_fib_index)
128 clib_bihash_kv_16_8_t kv, value;
130 init_ed_k (&kv, ip->src_address, src_port, ip->dst_address, dst_port,
131 rx_fib_index, ip->protocol);
132 if (!clib_bihash_search_16_8 (&sm->flow_hash, &kv, &value))
138 static void create_bypass_for_fwd (snat_main_t *sm, vlib_buffer_t *b,
139 snat_session_t *s, ip4_header_t *ip,
140 u32 rx_fib_index, u32 thread_index);
142 static snat_session_t *create_session_for_static_mapping_ed (
143 snat_main_t *sm, vlib_buffer_t *b, ip4_address_t i2o_addr, u16 i2o_port,
144 u32 i2o_fib_index, ip4_address_t o2i_addr, u16 o2i_port, u32 o2i_fib_index,
145 nat_protocol_t nat_proto, vlib_node_runtime_t *node, u32 rx_fib_index,
146 u32 thread_index, twice_nat_type_t twice_nat, lb_nat_type_t lb_nat, f64 now,
147 snat_static_mapping_t *mapping);
150 icmp_out2in_ed_slow_path (snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip,
151 icmp46_header_t *icmp, u32 sw_if_index,
152 u32 rx_fib_index, vlib_node_runtime_t *node,
153 u32 next, f64 now, u32 thread_index,
154 snat_session_t **s_p)
156 vlib_main_t *vm = vlib_get_main ();
161 snat_session_t *s = 0;
162 u8 is_addr_only, identity_nat;
163 ip4_address_t sm_addr;
166 snat_static_mapping_t *m;
168 ip4_address_t lookup_saddr, lookup_daddr;
169 u16 lookup_sport, lookup_dport;
171 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
172 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
174 if (nat_get_icmp_session_lookup_values (b, ip, &lookup_saddr, &lookup_sport,
175 &lookup_daddr, &lookup_dport,
178 b->error = node->errors[NAT_OUT2IN_ED_ERROR_UNSUPPORTED_PROTOCOL];
179 next = NAT_NEXT_DROP;
183 if (snat_static_mapping_match (
184 vm, sm, ip->dst_address, lookup_sport, rx_fib_index,
185 ip_proto_to_nat_proto (ip->protocol), &sm_addr, &sm_port,
186 &sm_fib_index, 1, &is_addr_only, 0, 0, 0, &identity_nat, &m))
188 // static mapping not matched
189 if (!sm->forwarding_enabled)
191 /* Don't NAT packet aimed at the intfc address */
192 if (!is_interface_addr (sm, node, sw_if_index,
193 ip->dst_address.as_u32))
195 b->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
196 next = NAT_NEXT_DROP;
201 if (next_src_nat (sm, ip, lookup_sport, lookup_dport, thread_index,
204 next = NAT_NEXT_IN2OUT_ED_FAST_PATH;
208 create_bypass_for_fwd (sm, b, s, ip, rx_fib_index, thread_index);
214 if (PREDICT_FALSE (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
216 (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
217 ICMP4_echo_request ||
220 b->error = node->errors[NAT_OUT2IN_ED_ERROR_BAD_ICMP_TYPE];
221 next = NAT_NEXT_DROP;
225 if (PREDICT_FALSE (identity_nat))
230 /* Create session initiated by host from external network */
231 s = create_session_for_static_mapping_ed (
232 sm, b, sm_addr, sm_port, sm_fib_index, ip->dst_address, lookup_sport,
233 rx_fib_index, ip_proto_to_nat_proto (lookup_protocol), node, rx_fib_index,
234 thread_index, 0, 0, vlib_time_now (vm), m);
236 next = NAT_NEXT_DROP;
238 if (PREDICT_TRUE (!ip4_is_fragment (ip)))
240 sum = ip_incremental_checksum_buffer (
241 vm, b, (u8 *) icmp - (u8 *) vlib_buffer_get_current (b),
242 ntohs (ip->length) - ip4_header_bytes (ip), 0);
243 checksum = ~ip_csum_fold (sum);
244 if (checksum != 0 && checksum != 0xffff)
246 next = NAT_NEXT_DROP;
251 if (PREDICT_TRUE (next != NAT_NEXT_DROP && s))
254 nat44_session_update_counters (
255 s, now, vlib_buffer_length_in_chain (vm, b), thread_index);
256 /* Per-user LRU list maintenance */
257 nat44_session_update_lru (sm, s, thread_index);
260 if (NAT_NEXT_DROP == next && s)
262 nat_ed_session_delete (sm, s, thread_index, 1);
269 // allocate exact address based on preference
270 static_always_inline int
271 nat_alloc_addr_and_port_exact (snat_address_t * a,
273 nat_protocol_t proto,
274 ip4_address_t * addr,
276 u16 port_per_thread, u32 snat_thread_index)
278 snat_main_t *sm = &snat_main;
283 #define _(N, j, n, s) \
284 case NAT_PROTOCOL_##N: \
285 if (a->busy_##n##_ports_per_thread[thread_index] < port_per_thread) \
289 portnum = (port_per_thread * \
290 snat_thread_index) + \
291 snat_random_port(0, port_per_thread - 1) + 1024; \
292 if (a->busy_##n##_port_refcounts[portnum]) \
294 --a->busy_##n##_port_refcounts[portnum]; \
295 a->busy_##n##_ports_per_thread[thread_index]++; \
296 a->busy_##n##_ports++; \
298 *port = clib_host_to_net_u16(portnum); \
305 default : nat_elog_info (sm, "unknown protocol");
309 /* Totally out of translations to use... */
310 nat_ipfix_logging_addresses_exhausted (thread_index, 0);
314 static_always_inline int
315 nat44_ed_alloc_outside_addr_and_port (snat_address_t *addresses, u32 fib_index,
316 u32 thread_index, nat_protocol_t proto,
317 ip4_address_t *addr, u16 *port,
319 u32 snat_thread_index)
321 snat_main_t *sm = &snat_main;
322 snat_address_t *a, *ga = 0;
326 for (i = 0; i < vec_len (addresses); i++)
331 #define _(N, j, n, s) \
332 case NAT_PROTOCOL_##N: \
333 if (a->busy_##n##_ports_per_thread[thread_index] < port_per_thread) \
335 if (a->fib_index == fib_index) \
339 portnum = (port_per_thread * snat_thread_index) + \
340 snat_random_port (0, port_per_thread - 1) + 1024; \
341 if (a->busy_##n##_port_refcounts[portnum]) \
343 --a->busy_##n##_port_refcounts[portnum]; \
344 a->busy_##n##_ports_per_thread[thread_index]++; \
345 a->busy_##n##_ports++; \
347 *port = clib_host_to_net_u16 (portnum); \
351 else if (a->fib_index == ~0) \
359 default : nat_elog_info (sm, "unknown protocol");
369 #define _(N, j, n, s) \
370 case NAT_PROTOCOL_##N: \
373 portnum = (port_per_thread * snat_thread_index) + \
374 snat_random_port (0, port_per_thread - 1) + 1024; \
375 if (a->busy_##n##_port_refcounts[portnum]) \
377 ++a->busy_##n##_port_refcounts[portnum]; \
378 a->busy_##n##_ports_per_thread[thread_index]++; \
379 a->busy_##n##_ports++; \
381 *port = clib_host_to_net_u16 (portnum); \
387 default : nat_elog_info (sm, "unknown protocol");
392 /* Totally out of translations to use... */
393 nat_ipfix_logging_addresses_exhausted (thread_index, 0);
397 static snat_session_t *
398 create_session_for_static_mapping_ed (
399 snat_main_t *sm, vlib_buffer_t *b, ip4_address_t i2o_addr, u16 i2o_port,
400 u32 i2o_fib_index, ip4_address_t o2i_addr, u16 o2i_port, u32 o2i_fib_index,
401 nat_protocol_t nat_proto, vlib_node_runtime_t *node, u32 rx_fib_index,
402 u32 thread_index, twice_nat_type_t twice_nat, lb_nat_type_t lb_nat, f64 now,
403 snat_static_mapping_t *mapping)
407 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
410 (nat44_ed_maximum_sessions_exceeded (sm, rx_fib_index, thread_index)))
412 b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED];
413 nat_elog_notice (sm, "maximum sessions exceeded");
417 s = nat_ed_session_alloc (sm, thread_index, now, nat_proto);
420 b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED];
421 nat_elog_warn (sm, "create NAT session failed");
425 ip = vlib_buffer_get_current (b);
427 s->ext_host_addr.as_u32 = ip->src_address.as_u32;
429 nat_proto == NAT_PROTOCOL_ICMP ? 0 : vnet_buffer (b)->ip.reass.l4_src_port;
430 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
432 s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
433 if (lb_nat == AFFINITY_LB_NAT)
434 s->flags |= SNAT_SESSION_FLAG_AFFINITY;
435 s->out2in.addr = o2i_addr;
436 s->out2in.port = o2i_port;
437 s->out2in.fib_index = o2i_fib_index;
438 s->in2out.addr = i2o_addr;
439 s->in2out.port = i2o_port;
440 s->in2out.fib_index = i2o_fib_index;
441 s->nat_proto = nat_proto;
443 if (NAT_PROTOCOL_ICMP == nat_proto)
445 nat_6t_o2i_flow_init (sm, thread_index, s, s->ext_host_addr, o2i_port,
446 o2i_addr, o2i_port, o2i_fib_index, ip->protocol);
447 nat_6t_flow_icmp_id_rewrite_set (&s->o2i, i2o_port);
451 nat_6t_o2i_flow_init (sm, thread_index, s, s->ext_host_addr,
452 s->ext_host_port, o2i_addr, o2i_port,
453 o2i_fib_index, ip->protocol);
454 nat_6t_flow_dport_rewrite_set (&s->o2i, i2o_port);
456 nat_6t_flow_daddr_rewrite_set (&s->o2i, i2o_addr.as_u32);
457 nat_6t_flow_txfib_rewrite_set (&s->o2i, i2o_fib_index);
459 if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 1))
461 b->error = node->errors[NAT_OUT2IN_ED_ERROR_HASH_ADD_FAILED];
462 nat_ed_session_delete (sm, s, thread_index, 1);
463 nat_elog_warn (sm, "out2in flow hash add failed");
467 if (twice_nat == TWICE_NAT || (twice_nat == TWICE_NAT_SELF &&
468 ip->src_address.as_u32 == i2o_addr.as_u32))
471 snat_address_t *filter = 0;
473 // if exact address is specified use this address
474 if (is_sm_exact_address (mapping->flags))
477 vec_foreach (ap, sm->twice_nat_addresses)
479 if (mapping->pool_addr.as_u32 == ap->addr.as_u32)
489 rc = nat_alloc_addr_and_port_exact (filter,
492 &s->ext_host_nat_addr,
493 &s->ext_host_nat_port,
495 tsm->snat_thread_index);
496 s->flags |= SNAT_SESSION_FLAG_EXACT_ADDRESS;
500 rc = nat44_ed_alloc_outside_addr_and_port (
501 sm->twice_nat_addresses, 0, thread_index, nat_proto,
502 &s->ext_host_nat_addr, &s->ext_host_nat_port, sm->port_per_thread,
503 tsm->snat_thread_index);
508 b->error = node->errors[NAT_OUT2IN_ED_ERROR_OUT_OF_PORTS];
509 if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 0))
511 nat_elog_warn (sm, "out2in flow hash del failed");
513 snat_free_outside_address_and_port (
514 sm->twice_nat_addresses, thread_index, &s->ext_host_nat_addr,
515 s->ext_host_nat_port, s->nat_proto);
516 nat_ed_session_delete (sm, s, thread_index, 1);
520 s->flags |= SNAT_SESSION_FLAG_TWICE_NAT;
522 nat_6t_flow_saddr_rewrite_set (&s->o2i, s->ext_host_nat_addr.as_u32);
523 if (NAT_PROTOCOL_ICMP == nat_proto)
525 nat_6t_flow_icmp_id_rewrite_set (&s->o2i, s->ext_host_nat_port);
529 nat_6t_flow_sport_rewrite_set (&s->o2i, s->ext_host_nat_port);
532 nat_6t_l3_l4_csum_calc (&s->o2i);
534 nat_6t_i2o_flow_init (sm, thread_index, s, i2o_addr, i2o_port,
535 s->ext_host_nat_addr, s->ext_host_nat_port,
536 i2o_fib_index, ip->protocol);
537 nat_6t_flow_daddr_rewrite_set (&s->i2o, s->ext_host_addr.as_u32);
538 if (NAT_PROTOCOL_ICMP == nat_proto)
540 nat_6t_flow_icmp_id_rewrite_set (&s->i2o, s->ext_host_port);
544 nat_6t_flow_dport_rewrite_set (&s->i2o, s->ext_host_port);
549 if (NAT_PROTOCOL_ICMP == nat_proto)
551 nat_6t_i2o_flow_init (sm, thread_index, s, i2o_addr, i2o_port,
552 s->ext_host_addr, i2o_port, i2o_fib_index,
557 nat_6t_i2o_flow_init (sm, thread_index, s, i2o_addr, i2o_port,
558 s->ext_host_addr, s->ext_host_port,
559 i2o_fib_index, ip->protocol);
563 nat_6t_flow_saddr_rewrite_set (&s->i2o, o2i_addr.as_u32);
564 if (NAT_PROTOCOL_ICMP == nat_proto)
566 nat_6t_flow_icmp_id_rewrite_set (&s->i2o, o2i_port);
570 nat_6t_flow_sport_rewrite_set (&s->i2o, o2i_port);
573 if (nat_ed_ses_i2o_flow_hash_add_del (sm, thread_index, s, 1))
575 nat_elog_notice (sm, "in2out flow hash add failed");
576 if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 0))
578 nat_elog_warn (sm, "out2in flow hash del failed");
580 nat_ed_session_delete (sm, s, thread_index, 1);
584 nat_ipfix_logging_nat44_ses_create (thread_index,
585 s->in2out.addr.as_u32,
586 s->out2in.addr.as_u32,
589 s->out2in.port, s->in2out.fib_index);
591 nat_syslog_nat44_sadd (0, s->in2out.fib_index, &s->in2out.addr,
592 s->in2out.port, &s->ext_host_nat_addr,
593 s->ext_host_nat_port, &s->out2in.addr, s->out2in.port,
594 &s->ext_host_addr, s->ext_host_port, s->nat_proto,
595 nat44_ed_is_twice_nat_session (s));
597 per_vrf_sessions_register_session (s, thread_index);
603 create_bypass_for_fwd (snat_main_t *sm, vlib_buffer_t *b, snat_session_t *s,
604 ip4_header_t *ip, u32 rx_fib_index, u32 thread_index)
606 clib_bihash_kv_16_8_t kv, value;
607 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
608 vlib_main_t *vm = vlib_get_main ();
609 f64 now = vlib_time_now (vm);
610 u16 lookup_sport, lookup_dport;
612 ip4_address_t lookup_saddr, lookup_daddr;
614 if (ip->protocol == IP_PROTOCOL_ICMP)
616 if (nat_get_icmp_session_lookup_values (b, ip, &lookup_daddr,
617 &lookup_sport, &lookup_saddr,
618 &lookup_dport, &lookup_protocol))
623 if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
625 lookup_sport = vnet_buffer (b)->ip.reass.l4_dst_port;
626 lookup_dport = vnet_buffer (b)->ip.reass.l4_src_port;
633 lookup_saddr.as_u32 = ip->dst_address.as_u32;
634 lookup_daddr.as_u32 = ip->src_address.as_u32;
635 lookup_protocol = ip->protocol;
638 init_ed_k (&kv, lookup_saddr, lookup_sport, lookup_daddr, lookup_dport,
639 rx_fib_index, lookup_protocol);
641 if (!clib_bihash_search_16_8 (&sm->flow_hash, &kv, &value))
643 ASSERT (thread_index == ed_value_get_thread_index (&value));
645 pool_elt_at_index (tsm->sessions,
646 ed_value_get_session_index (&value));
648 else if (ip->protocol == IP_PROTOCOL_ICMP &&
649 icmp_type_is_error_message
650 (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
659 (nat44_ed_maximum_sessions_exceeded
660 (sm, rx_fib_index, thread_index)))
663 s = nat_ed_session_alloc (sm, thread_index, now, ip->protocol);
666 nat_elog_warn (sm, "create NAT session failed");
670 proto = ip_proto_to_nat_proto (ip->protocol);
672 s->ext_host_addr = ip->src_address;
673 s->ext_host_port = lookup_dport;
674 s->flags |= SNAT_SESSION_FLAG_FWD_BYPASS;
675 s->out2in.addr = ip->dst_address;
676 s->out2in.port = lookup_sport;
677 s->nat_proto = proto;
678 if (proto == NAT_PROTOCOL_OTHER)
680 s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
681 s->out2in.port = ip->protocol;
683 s->out2in.fib_index = rx_fib_index;
684 s->in2out.addr = s->out2in.addr;
685 s->in2out.port = s->out2in.port;
686 s->in2out.fib_index = s->out2in.fib_index;
688 nat_6t_i2o_flow_init (sm, thread_index, s, ip->dst_address, lookup_sport,
689 ip->src_address, lookup_dport, rx_fib_index,
691 nat_6t_flow_txfib_rewrite_set (&s->i2o, rx_fib_index);
692 if (nat_ed_ses_i2o_flow_hash_add_del (sm, thread_index, s, 1))
694 nat_elog_notice (sm, "in2out flow add failed");
695 nat_ed_session_delete (sm, s, thread_index, 1);
699 per_vrf_sessions_register_session (s, thread_index);
702 if (ip->protocol == IP_PROTOCOL_TCP)
704 tcp_header_t *tcp = ip4_next_header (ip);
705 nat44_set_tcp_session_state_o2i (sm, now, s, tcp->flags,
706 tcp->ack_number, tcp->seq_number,
711 nat44_session_update_counters (s, now, 0, thread_index);
712 /* Per-user LRU list maintenance */
713 nat44_session_update_lru (sm, s, thread_index);
716 static snat_session_t *
717 nat44_ed_out2in_slowpath_unknown_proto (snat_main_t *sm, vlib_buffer_t *b,
718 ip4_header_t *ip, u32 rx_fib_index,
719 u32 thread_index, f64 now,
721 vlib_node_runtime_t *node)
723 clib_bihash_kv_8_8_t kv, value;
724 snat_static_mapping_t *m;
728 nat44_ed_maximum_sessions_exceeded (sm, rx_fib_index, thread_index)))
730 b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED];
731 nat_elog_notice (sm, "maximum sessions exceeded");
735 init_nat_k (&kv, ip->dst_address, 0, 0, 0);
736 if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
738 b->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
742 m = pool_elt_at_index (sm->static_mappings, value.value);
744 /* Create a new session */
745 s = nat_ed_session_alloc (sm, thread_index, now, ip->protocol);
748 b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED];
749 nat_elog_warn (sm, "create NAT session failed");
753 s->ext_host_addr.as_u32 = ip->src_address.as_u32;
754 s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
755 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
756 s->out2in.addr.as_u32 = ip->dst_address.as_u32;
757 s->out2in.fib_index = rx_fib_index;
758 s->in2out.addr.as_u32 = m->local_addr.as_u32;
759 s->in2out.fib_index = m->fib_index;
760 s->in2out.port = s->out2in.port = ip->protocol;
762 nat_6t_o2i_flow_init (sm, thread_index, s, ip->dst_address, 0,
763 ip->src_address, 0, m->fib_index, ip->protocol);
764 nat_6t_flow_saddr_rewrite_set (&s->i2o, ip->dst_address.as_u32);
765 if (nat_ed_ses_i2o_flow_hash_add_del (sm, thread_index, s, 1))
767 nat_elog_notice (sm, "in2out key add failed");
768 nat_ed_session_delete (sm, s, thread_index, 1);
772 nat_6t_o2i_flow_init (sm, thread_index, s, ip->src_address, 0,
773 ip->dst_address, 0, rx_fib_index, ip->protocol);
774 nat_6t_flow_daddr_rewrite_set (&s->o2i, m->local_addr.as_u32);
775 nat_6t_flow_txfib_rewrite_set (&s->o2i, m->fib_index);
776 if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 1))
778 nat_elog_notice (sm, "out2in flow hash add failed");
779 nat_ed_session_delete (sm, s, thread_index, 1);
783 per_vrf_sessions_register_session (s, thread_index);
786 nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b),
788 /* Per-user LRU list maintenance */
789 nat44_session_update_lru (sm, s, thread_index);
795 nat44_ed_out2in_fast_path_node_fn_inline (vlib_main_t * vm,
796 vlib_node_runtime_t * node,
797 vlib_frame_t * frame,
800 u32 n_left_from, *from;
801 snat_main_t *sm = &snat_main;
802 f64 now = vlib_time_now (vm);
803 u32 thread_index = vm->thread_index;
804 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
806 from = vlib_frame_vector_args (frame);
807 n_left_from = frame->n_vectors;
809 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
810 u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
811 vlib_get_buffers (vm, from, b, n_left_from);
813 while (n_left_from > 0)
816 u32 sw_if_index0, rx_fib_index0;
817 nat_protocol_t proto0;
819 snat_session_t *s0 = 0;
820 clib_bihash_kv_16_8_t kv0, value0;
821 nat_translation_error_e translation_error = NAT_ED_TRNSL_ERR_SUCCESS;
822 nat_slow_path_reason_e slow_path_reason = NAT_ED_SP_REASON_NO_REASON;
823 nat_6t_flow_t *f = 0;
825 int lookup_skipped = 0;
830 /* Prefetch next iteration. */
831 if (PREDICT_TRUE (n_left_from >= 2))
837 vlib_prefetch_buffer_header (p2, LOAD);
839 clib_prefetch_load (p2->data);
842 next[0] = vnet_buffer2 (b0)->nat.arc_next;
844 lookup.sport = vnet_buffer (b0)->ip.reass.l4_src_port;
845 lookup.dport = vnet_buffer (b0)->ip.reass.l4_dst_port;
847 vnet_buffer (b0)->snat.flags = 0;
848 ip0 = vlib_buffer_get_current (b0);
850 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
852 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index0);
854 lookup.fib_index = rx_fib_index0;
856 if (PREDICT_FALSE (ip0->ttl == 1))
858 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
859 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
860 ICMP4_time_exceeded_ttl_exceeded_in_transit,
862 next[0] = NAT_NEXT_ICMP_ERROR;
866 proto0 = ip_proto_to_nat_proto (ip0->protocol);
868 if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
870 if (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
871 ICMP4_echo_request &&
872 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
874 !icmp_type_is_error_message (
875 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags))
877 b0->error = node->errors[NAT_OUT2IN_ED_ERROR_BAD_ICMP_TYPE];
878 next[0] = NAT_NEXT_DROP;
881 int err = nat_get_icmp_session_lookup_values (
882 b0, ip0, &lookup.saddr, &lookup.sport, &lookup.daddr,
883 &lookup.dport, &lookup.proto);
886 b0->error = node->errors[err];
887 next[0] = NAT_NEXT_DROP;
893 lookup.saddr.as_u32 = ip0->src_address.as_u32;
894 lookup.daddr.as_u32 = ip0->dst_address.as_u32;
895 lookup.proto = ip0->protocol;
898 /* there might be a stashed index in vnet_buffer2 from handoff or
899 * classify node, see if it can be used */
900 if (is_multi_worker &&
901 !pool_is_free_index (tsm->sessions,
902 vnet_buffer2 (b0)->nat.cached_session_index))
904 s0 = pool_elt_at_index (tsm->sessions,
905 vnet_buffer2 (b0)->nat.cached_session_index);
906 if (PREDICT_TRUE (nat_6t_t_eq (&s0->o2i.match, &lookup)) ||
907 (s0->flags & SNAT_SESSION_FLAG_TWICE_NAT &&
908 nat_6t_t_eq (&s0->i2o.match, &lookup)))
910 /* yes, this is the droid we're looking for */
917 init_ed_k (&kv0, lookup.saddr, lookup.sport, lookup.daddr, lookup.dport,
918 lookup.fib_index, lookup.proto);
921 if (clib_bihash_search_16_8 (&sm->flow_hash, &kv0, &value0))
923 // flow does not exist go slow path
924 slow_path_reason = NAT_ED_SP_REASON_LOOKUP_FAILED;
925 next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
928 ASSERT (thread_index == ed_value_get_thread_index (&value0));
930 pool_elt_at_index (tsm->sessions,
931 ed_value_get_session_index (&value0));
934 ASSERT (thread_index == s0->thread_index);
936 if (PREDICT_FALSE (per_vrf_sessions_is_expired (s0, thread_index)))
938 // session is closed, go slow path
939 nat_free_session_data (sm, s0, thread_index, 0);
940 nat_ed_session_delete (sm, s0, thread_index, 1);
941 slow_path_reason = NAT_ED_SP_REASON_VRF_EXPIRED;
942 next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
946 if (s0->tcp_closed_timestamp)
948 if (now >= s0->tcp_closed_timestamp)
950 // session is closed, go slow path, freed in slow path
951 slow_path_reason = NAT_ED_SP_TCP_CLOSED;
952 next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
956 // session in transitory timeout, drop
957 b0->error = node->errors[NAT_OUT2IN_ED_ERROR_TCP_CLOSED];
958 next[0] = NAT_NEXT_DROP;
963 // drop if session expired
964 u64 sess_timeout_time;
966 s0->last_heard + (f64) nat44_session_get_timeout (sm, s0);
967 if (now >= sess_timeout_time)
969 // session is closed, go slow path
970 nat_free_session_data (sm, s0, thread_index, 0);
971 nat_ed_session_delete (sm, s0, thread_index, 1);
972 slow_path_reason = NAT_ED_SP_SESS_EXPIRED;
973 next[0] = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
977 if (nat_6t_t_eq (&s0->o2i.match, &lookup))
981 else if (s0->flags & SNAT_SESSION_FLAG_TWICE_NAT &&
982 nat_6t_t_eq (&s0->i2o.match, &lookup))
989 * Send DHCP packets to the ipv4 stack, or we won't
990 * be able to use dhcp client on the outside interface
993 proto0 == NAT_PROTOCOL_UDP &&
994 (vnet_buffer (b0)->ip.reass.l4_dst_port ==
995 clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client))))
1000 if (!sm->forwarding_enabled)
1002 b0->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
1003 next[0] = NAT_NEXT_DROP;
1008 if (nat_6t_t_eq (&s0->i2o.match, &lookup))
1014 // FIXME TODO bypass ???
1015 // create_bypass_for_fwd (sm, b0, s0, ip0, rx_fib_index0,
1017 translation_error = NAT_ED_TRNSL_ERR_FLOW_MISMATCH;
1018 nat_free_session_data (sm, s0, thread_index, 0);
1019 nat_ed_session_delete (sm, s0, thread_index, 1);
1020 next[0] = NAT_NEXT_DROP;
1021 b0->error = node->errors[NAT_OUT2IN_ED_ERROR_TRNSL_FAILED];
1027 if (NAT_ED_TRNSL_ERR_SUCCESS !=
1028 (translation_error = nat_6t_flow_buf_translate_o2i (
1029 vm, sm, b0, ip0, f, proto0, 0 /* is_output_feature */)))
1031 next[0] = NAT_NEXT_DROP;
1032 b0->error = node->errors[NAT_OUT2IN_ED_ERROR_TRNSL_FAILED];
1038 case NAT_PROTOCOL_TCP:
1039 vlib_increment_simple_counter (&sm->counters.fastpath.out2in.tcp,
1040 thread_index, sw_if_index0, 1);
1041 nat44_set_tcp_session_state_o2i (sm, now, s0,
1042 vnet_buffer (b0)->ip.
1043 reass.icmp_type_or_tcp_flags,
1044 vnet_buffer (b0)->ip.
1045 reass.tcp_ack_number,
1046 vnet_buffer (b0)->ip.
1047 reass.tcp_seq_number,
1050 case NAT_PROTOCOL_UDP:
1051 vlib_increment_simple_counter (&sm->counters.fastpath.out2in.udp,
1052 thread_index, sw_if_index0, 1);
1054 case NAT_PROTOCOL_ICMP:
1055 vlib_increment_simple_counter (&sm->counters.fastpath.out2in.icmp,
1056 thread_index, sw_if_index0, 1);
1058 case NAT_PROTOCOL_OTHER:
1059 vlib_increment_simple_counter (&sm->counters.fastpath.out2in.other,
1060 thread_index, sw_if_index0, 1);
1065 nat44_session_update_counters (s0, now,
1066 vlib_buffer_length_in_chain (vm, b0),
1068 /* Per-user LRU list maintenance */
1069 nat44_session_update_lru (sm, s0, thread_index);
1072 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1073 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1075 nat44_ed_out2in_trace_t *t =
1076 vlib_add_trace (vm, node, b0, sizeof (*t));
1077 t->sw_if_index = sw_if_index0;
1078 t->next_index = next[0];
1079 t->is_slow_path = 0;
1080 t->translation_error = translation_error;
1081 clib_memcpy (&t->search_key, &kv0, sizeof (t->search_key));
1082 t->lookup_skipped = lookup_skipped;
1083 t->slow_path_reason = slow_path_reason;
1087 t->session_index = s0 - tsm->sessions;
1088 clib_memcpy (&t->i2of, &s0->i2o, sizeof (t->i2of));
1089 clib_memcpy (&t->o2if, &s0->o2i, sizeof (t->o2if));
1090 t->translation_via_i2of = (&s0->i2o == f);
1094 t->session_index = ~0;
1098 if (next[0] == NAT_NEXT_DROP)
1100 vlib_increment_simple_counter (&sm->counters.fastpath.out2in.drops,
1101 thread_index, sw_if_index0, 1);
1108 vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
1110 return frame->n_vectors;
1114 nat44_ed_out2in_slow_path_node_fn_inline (vlib_main_t * vm,
1115 vlib_node_runtime_t * node,
1116 vlib_frame_t * frame)
1118 u32 n_left_from, *from;
1119 snat_main_t *sm = &snat_main;
1120 f64 now = vlib_time_now (vm);
1121 u32 thread_index = vm->thread_index;
1122 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
1123 snat_static_mapping_t *m;
1125 from = vlib_frame_vector_args (frame);
1126 n_left_from = frame->n_vectors;
1128 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
1129 u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
1130 vlib_get_buffers (vm, from, b, n_left_from);
1132 while (n_left_from > 0)
1135 u32 sw_if_index0, rx_fib_index0;
1136 nat_protocol_t proto0;
1139 icmp46_header_t *icmp0;
1140 snat_session_t *s0 = 0;
1141 clib_bihash_kv_16_8_t kv0, value0;
1142 lb_nat_type_t lb_nat0;
1143 twice_nat_type_t twice_nat0;
1145 ip4_address_t sm_addr;
1148 nat_translation_error_e translation_error = NAT_ED_TRNSL_ERR_SUCCESS;
1151 next[0] = vnet_buffer2 (b0)->nat.arc_next;
1153 vnet_buffer (b0)->snat.flags = 0;
1154 ip0 = vlib_buffer_get_current (b0);
1156 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1158 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index0);
1160 if (PREDICT_FALSE (ip0->ttl == 1))
1162 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1163 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1164 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1166 next[0] = NAT_NEXT_ICMP_ERROR;
1170 udp0 = ip4_next_header (ip0);
1171 icmp0 = (icmp46_header_t *) udp0;
1172 proto0 = ip_proto_to_nat_proto (ip0->protocol);
1174 if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
1176 s0 = nat44_ed_out2in_slowpath_unknown_proto (
1177 sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node);
1178 if (!sm->forwarding_enabled)
1181 next[0] = NAT_NEXT_DROP;
1183 if (NAT_NEXT_DROP != next[0] && s0 &&
1184 NAT_ED_TRNSL_ERR_SUCCESS !=
1185 (translation_error = nat_6t_flow_buf_translate_o2i (
1186 vm, sm, b0, ip0, &s0->o2i, proto0,
1187 0 /* is_output_feature */)))
1189 next[0] = NAT_NEXT_DROP;
1190 b0->error = node->errors[NAT_OUT2IN_ED_ERROR_TRNSL_FAILED];
1194 vlib_increment_simple_counter (&sm->counters.slowpath.out2in.other,
1195 thread_index, sw_if_index0, 1);
1199 if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
1201 next[0] = icmp_out2in_ed_slow_path
1202 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1203 next[0], now, thread_index, &s0);
1205 if (NAT_NEXT_DROP != next[0] && s0 &&
1206 NAT_ED_TRNSL_ERR_SUCCESS !=
1207 (translation_error = nat_6t_flow_buf_translate_o2i (
1208 vm, sm, b0, ip0, &s0->o2i, proto0,
1209 0 /* is_output_feature */)))
1211 next[0] = NAT_NEXT_DROP;
1212 b0->error = node->errors[NAT_OUT2IN_ED_ERROR_TRNSL_FAILED];
1216 vlib_increment_simple_counter (&sm->counters.slowpath.out2in.icmp,
1217 thread_index, sw_if_index0, 1);
1221 init_ed_k (&kv0, ip0->src_address,
1222 vnet_buffer (b0)->ip.reass.l4_src_port, ip0->dst_address,
1223 vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0,
1227 if (!clib_bihash_search_16_8 (&sm->flow_hash, &kv0, &value0))
1229 ASSERT (thread_index == ed_value_get_thread_index (&value0));
1231 pool_elt_at_index (tsm->sessions,
1232 ed_value_get_session_index (&value0));
1234 if (s0->tcp_closed_timestamp && now >= s0->tcp_closed_timestamp)
1236 nat_free_session_data (sm, s0, thread_index, 0);
1237 nat_ed_session_delete (sm, s0, thread_index, 1);
1244 /* Try to match static mapping by external address and port,
1245 destination address and port in packet */
1247 if (snat_static_mapping_match (
1248 vm, sm, ip0->dst_address,
1249 vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0, proto0,
1250 &sm_addr, &sm_port, &sm_fib_index, 1, 0, &twice_nat0, &lb_nat0,
1251 &ip0->src_address, &identity_nat0, &m))
1254 * Send DHCP packets to the ipv4 stack, or we won't
1255 * be able to use dhcp client on the outside interface
1257 if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_UDP
1258 && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
1259 clib_host_to_net_u16
1260 (UDP_DST_PORT_dhcp_to_client))))
1265 if (!sm->forwarding_enabled)
1268 node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
1269 next[0] = NAT_NEXT_DROP;
1274 (sm, ip0, vnet_buffer (b0)->ip.reass.l4_src_port,
1275 vnet_buffer (b0)->ip.reass.l4_dst_port,
1276 thread_index, rx_fib_index0))
1278 next[0] = NAT_NEXT_IN2OUT_ED_FAST_PATH;
1282 create_bypass_for_fwd (sm, b0, s0, ip0, rx_fib_index0,
1289 if (PREDICT_FALSE (identity_nat0))
1292 if ((proto0 == NAT_PROTOCOL_TCP)
1293 && !tcp_flags_is_init (vnet_buffer (b0)->ip.
1294 reass.icmp_type_or_tcp_flags))
1296 b0->error = node->errors[NAT_OUT2IN_ED_ERROR_NON_SYN];
1297 next[0] = NAT_NEXT_DROP;
1301 /* Create session initiated by host from external network */
1302 s0 = create_session_for_static_mapping_ed (sm, b0,
1307 ip.reass.l4_dst_port,
1308 rx_fib_index0, proto0,
1309 node, rx_fib_index0,
1310 thread_index, twice_nat0,
1314 next[0] = NAT_NEXT_DROP;
1319 if (NAT_ED_TRNSL_ERR_SUCCESS !=
1320 (translation_error = nat_6t_flow_buf_translate_o2i (
1321 vm, sm, b0, ip0, &s0->o2i, proto0, 0 /* is_output_feature */)))
1323 next[0] = NAT_NEXT_DROP;
1327 if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
1329 vlib_increment_simple_counter (&sm->counters.slowpath.out2in.tcp,
1330 thread_index, sw_if_index0, 1);
1331 nat44_set_tcp_session_state_o2i (sm, now, s0,
1332 vnet_buffer (b0)->ip.
1333 reass.icmp_type_or_tcp_flags,
1334 vnet_buffer (b0)->ip.
1335 reass.tcp_ack_number,
1336 vnet_buffer (b0)->ip.
1337 reass.tcp_seq_number,
1342 vlib_increment_simple_counter (&sm->counters.slowpath.out2in.udp,
1343 thread_index, sw_if_index0, 1);
1347 nat44_session_update_counters (s0, now,
1348 vlib_buffer_length_in_chain (vm, b0),
1350 /* Per-user LRU list maintenance */
1351 nat44_session_update_lru (sm, s0, thread_index);
1354 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1355 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1357 nat44_ed_out2in_trace_t *t =
1358 vlib_add_trace (vm, node, b0, sizeof (*t));
1359 t->sw_if_index = sw_if_index0;
1360 t->next_index = next[0];
1361 t->is_slow_path = 1;
1362 t->translation_error = translation_error;
1363 clib_memcpy (&t->search_key, &kv0, sizeof (t->search_key));
1367 t->session_index = s0 - tsm->sessions;
1368 clib_memcpy (&t->i2of, &s0->i2o, sizeof (t->i2of));
1369 clib_memcpy (&t->o2if, &s0->o2i, sizeof (t->o2if));
1373 t->session_index = ~0;
1377 if (next[0] == NAT_NEXT_DROP)
1379 vlib_increment_simple_counter (&sm->counters.slowpath.out2in.drops,
1380 thread_index, sw_if_index0, 1);
1388 vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
1391 return frame->n_vectors;
1394 VLIB_NODE_FN (nat44_ed_out2in_node) (vlib_main_t * vm,
1395 vlib_node_runtime_t * node,
1396 vlib_frame_t * frame)
1398 if (snat_main.num_workers > 1)
1400 return nat44_ed_out2in_fast_path_node_fn_inline (vm, node, frame, 1);
1404 return nat44_ed_out2in_fast_path_node_fn_inline (vm, node, frame, 0);
1408 VLIB_REGISTER_NODE (nat44_ed_out2in_node) = {
1409 .name = "nat44-ed-out2in",
1410 .vector_size = sizeof (u32),
1411 .sibling_of = "nat-default",
1412 .format_trace = format_nat44_ed_out2in_trace,
1413 .type = VLIB_NODE_TYPE_INTERNAL,
1414 .n_errors = ARRAY_LEN(nat_out2in_ed_error_strings),
1415 .error_strings = nat_out2in_ed_error_strings,
1416 .runtime_data_bytes = sizeof (snat_runtime_t),
1419 VLIB_NODE_FN (nat44_ed_out2in_slowpath_node) (vlib_main_t * vm,
1420 vlib_node_runtime_t * node,
1421 vlib_frame_t * frame)
1423 return nat44_ed_out2in_slow_path_node_fn_inline (vm, node, frame);
1426 VLIB_REGISTER_NODE (nat44_ed_out2in_slowpath_node) = {
1427 .name = "nat44-ed-out2in-slowpath",
1428 .vector_size = sizeof (u32),
1429 .sibling_of = "nat-default",
1430 .format_trace = format_nat44_ed_out2in_trace,
1431 .type = VLIB_NODE_TYPE_INTERNAL,
1432 .n_errors = ARRAY_LEN(nat_out2in_ed_error_strings),
1433 .error_strings = nat_out2in_ed_error_strings,
1434 .runtime_data_bytes = sizeof (snat_runtime_t),
1438 format_nat_pre_trace (u8 * s, va_list * args)
1440 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1441 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1442 nat_pre_trace_t *t = va_arg (*args, nat_pre_trace_t *);
1443 return format (s, "out2in next_index %d arc_next_index %d", t->next_index,
1447 VLIB_NODE_FN (nat_pre_out2in_node) (vlib_main_t * vm,
1448 vlib_node_runtime_t * node,
1449 vlib_frame_t * frame)
1451 return nat_pre_node_fn_inline (vm, node, frame,
1452 NAT_NEXT_OUT2IN_ED_FAST_PATH);
1455 VLIB_REGISTER_NODE (nat_pre_out2in_node) = {
1456 .name = "nat-pre-out2in",
1457 .vector_size = sizeof (u32),
1458 .sibling_of = "nat-default",
1459 .format_trace = format_nat_pre_trace,
1460 .type = VLIB_NODE_TYPE_INTERNAL,
1465 * fd.io coding-style-patch-verification: ON
1468 * eval: (c-set-style "gnu")