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 inside to outside 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_inlines.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_in2out_ed_error_strings[] = {
35 #define _(sym,string) string,
36 foreach_nat_in2out_ed_error
45 nat_translation_error_e translation_error;
48 clib_bihash_kv_16_8_t search_key;
50 u8 translation_via_i2of;
53 } nat_in2out_ed_trace_t;
56 format_nat_in2out_ed_trace (u8 * s, va_list * args)
58 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
59 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
60 nat_in2out_ed_trace_t *t = va_arg (*args, nat_in2out_ed_trace_t *);
64 t->is_slow_path ? "NAT44_IN2OUT_ED_SLOW_PATH" :
65 "NAT44_IN2OUT_ED_FAST_PATH";
67 s = format (s, "%s: sw_if_index %d, next index %d", tag, t->sw_if_index,
69 if (~0 != t->session_index)
71 s = format (s, ", session %d, translation result '%U' via %s",
72 t->session_index, format_nat_ed_translation_error,
74 t->translation_via_i2of ? "i2of" : "o2if");
75 s = format (s, "\n i2of %U", format_nat_6t_flow, &t->i2of);
76 s = format (s, "\n o2if %U", format_nat_6t_flow, &t->o2if);
80 if (t->lookup_skipped)
82 s = format (s, "\n lookup skipped - cached session index used");
86 s = format (s, "\n search key %U", format_ed_session_kvp,
90 if (IP_PROTOCOL_TCP == t->i2of.match.proto)
92 s = format (s, "\n TCP state: %U", format_nat44_ed_tcp_state,
100 nat_ed_alloc_addr_and_port_with_snat_address (
101 snat_main_t *sm, u8 proto, u32 thread_index, snat_address_t *a,
102 u16 port_per_thread, u32 snat_thread_index, snat_session_t *s,
103 ip4_address_t *outside_addr, u16 *outside_port)
105 const u16 port_thread_offset =
106 (port_per_thread * snat_thread_index) + ED_USER_PORT_OFFSET;
108 s->o2i.match.daddr = a->addr;
109 /* first try port suggested by caller */
110 u16 port = clib_net_to_host_u16 (*outside_port);
111 u16 port_offset = port - port_thread_offset;
112 if (port < port_thread_offset ||
113 port >= port_thread_offset + port_per_thread)
115 /* need to pick a different port, suggested port doesn't fit in
116 * this thread's port range */
117 port_offset = snat_random_port (0, port_per_thread - 1);
118 port = port_thread_offset + port_offset;
120 u16 attempts = ED_PORT_ALLOC_ATTEMPTS;
123 if (IP_PROTOCOL_ICMP == proto)
125 s->o2i.match.sport = clib_host_to_net_u16 (port);
127 s->o2i.match.dport = clib_host_to_net_u16 (port);
128 if (0 == nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 2))
130 *outside_addr = a->addr;
131 *outside_port = clib_host_to_net_u16 (port);
134 port_offset = snat_random_port (0, port_per_thread - 1);
135 port = port_thread_offset + port_offset;
138 while (attempts > 0);
143 nat_ed_alloc_addr_and_port (snat_main_t *sm, u32 rx_fib_index,
144 u32 tx_sw_if_index, u32 nat_proto,
145 u32 thread_index, ip4_address_t s_addr,
146 ip4_address_t d_addr, u32 snat_thread_index,
147 snat_session_t *s, ip4_address_t *outside_addr,
150 if (vec_len (sm->addresses) > 0)
152 u32 s_addr_offset = s_addr.as_u32 % vec_len (sm->addresses);
153 snat_address_t *a, *ja = 0, *ra = 0, *ba = 0;
157 if (tx_sw_if_index != ~0)
159 for (i = s_addr_offset; i < vec_len (sm->addresses); ++i)
161 a = sm->addresses + i;
162 if (a->fib_index == rx_fib_index)
164 if (a->sw_if_index == tx_sw_if_index)
166 if ((a->addr_len != ~0) &&
168 (d_addr.as_u32 & ip4_main.fib_masks[a->addr_len])))
171 return nat_ed_alloc_addr_and_port_with_snat_address (
172 sm, nat_proto, thread_index, a,
173 sm->port_per_thread, snat_thread_index, s,
174 outside_addr, outside_port);
180 else if (a->fib_index == ~0)
185 for (i = 0; i < s_addr_offset; ++i)
187 a = sm->addresses + i;
188 if (a->fib_index == rx_fib_index)
190 if (a->sw_if_index == tx_sw_if_index)
192 if ((a->addr_len != ~0) &&
194 (d_addr.as_u32 & ip4_main.fib_masks[a->addr_len])))
197 return nat_ed_alloc_addr_and_port_with_snat_address (
198 sm, nat_proto, thread_index, a,
199 sm->port_per_thread, snat_thread_index, s,
200 outside_addr, outside_port);
206 else if (a->fib_index == ~0)
213 return nat_ed_alloc_addr_and_port_with_snat_address (
214 sm, nat_proto, thread_index, ra, sm->port_per_thread,
215 snat_thread_index, s, outside_addr, outside_port);
220 // first try nat pool addresses to sw interface addreses mappings
221 for (i = s_addr_offset; i < vec_len (sm->addresses); ++i)
223 a = sm->addresses + i;
224 if (a->fib_index == rx_fib_index)
226 if ((a->addr_len != ~0) &&
228 (d_addr.as_u32 & ip4_main.fib_masks[a->addr_len])))
230 return nat_ed_alloc_addr_and_port_with_snat_address (
231 sm, nat_proto, thread_index, a, sm->port_per_thread,
232 snat_thread_index, s, outside_addr, outside_port);
236 else if (a->fib_index == ~0)
241 for (i = 0; i < s_addr_offset; ++i)
243 a = sm->addresses + i;
244 if (a->fib_index == rx_fib_index)
246 if ((a->addr_len != ~0) &&
248 (d_addr.as_u32 & ip4_main.fib_masks[a->addr_len])))
250 return nat_ed_alloc_addr_and_port_with_snat_address (
251 sm, nat_proto, thread_index, a, sm->port_per_thread,
252 snat_thread_index, s, outside_addr, outside_port);
256 else if (a->fib_index == ~0)
266 return nat_ed_alloc_addr_and_port_with_snat_address (
267 sm, nat_proto, thread_index, a, sm->port_per_thread,
268 snat_thread_index, s, outside_addr, outside_port);
271 /* Totally out of translations to use... */
272 nat_ipfix_logging_addresses_exhausted (thread_index, 0);
276 static_always_inline int
277 nat44_ed_external_sm_lookup (snat_main_t *sm, ip4_address_t match_addr,
278 u16 match_port, ip_protocol_t match_protocol,
279 ip4_address_t *daddr, u16 *dport)
281 snat_static_mapping_t *m =
282 nat44_ed_sm_o2i_lookup (sm, match_addr, match_port, 0, match_protocol);
285 /* Try address only mapping */
286 m = nat44_ed_sm_o2i_lookup (sm, match_addr, 0, 0, 0);
290 *daddr = m->local_addr;
293 /* Address only mapping doesn't change port */
294 *dport = is_sm_addr_only (m->flags) ? match_port : m->local_port;
299 static_always_inline vrf_table_t *
300 get_vrf_table_by_fib (u32 fib_index)
302 snat_main_t *sm = &snat_main;
305 pool_foreach (t, sm->vrf_tables)
307 if (fib_index == t->table_fib_index)
316 static_always_inline u32
317 get_tx_fib_index (u32 rx_fib_index, ip4_address_t addr)
319 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
321 .fp_proto = FIB_PROTOCOL_IP4,
323 .fp_addr = {.ip4.as_u32 = addr.as_u32,}
327 snat_main_t *sm = &snat_main;
328 vrf_table_t *t = get_vrf_table_by_fib (rx_fib_index);
330 u32 tx_fib_index = rx_fib_index;
334 // managed routes to other fibs
336 pool_foreach (r, t->routes)
338 fei = fib_table_lookup (r->fib_index, &pfx);
339 if ((FIB_NODE_INDEX_INVALID != fei) &&
340 (~0 != fib_entry_get_resolving_interface (fei)))
342 tx_fib_index = r->fib_index;
349 // default to configured fib
350 tx_fib_index = sm->outside_fib_index;
352 // default routes to other fibs
354 vec_foreach (f, sm->outside_fibs)
356 fei = fib_table_lookup (f->fib_index, &pfx);
357 if ((FIB_NODE_INDEX_INVALID != fei) &&
358 (~0 != fib_entry_get_resolving_interface (fei)))
360 tx_fib_index = f->fib_index;
369 static_always_inline int
370 is_destination_resolvable (u32 rx_fib_index, ip4_address_t addr)
372 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
374 .fp_proto = FIB_PROTOCOL_IP4,
376 .fp_addr = {.ip4.as_u32 = addr.as_u32,}
380 snat_main_t *sm = &snat_main;
381 vrf_table_t *t = get_vrf_table_by_fib (rx_fib_index);
386 // managed routes to other fibs
388 pool_foreach (r, t->routes)
390 fei = fib_table_lookup (r->fib_index, &pfx);
391 if ((FIB_NODE_INDEX_INVALID != fei) &&
392 (~0 != (ii = fib_entry_get_resolving_interface (fei))))
400 // default routes to other fibs
402 vec_foreach (f, sm->outside_fibs)
404 fei = fib_table_lookup (f->fib_index, &pfx);
405 if ((FIB_NODE_INDEX_INVALID != fei) &&
406 (~0 != (ii = fib_entry_get_resolving_interface (fei))))
409 pool_foreach (i, sm->interfaces)
411 if ((nat44_ed_is_interface_outside (i)) &&
412 (ii == i->sw_if_index))
425 slow_path_ed (vlib_main_t *vm, snat_main_t *sm, vlib_buffer_t *b,
426 ip4_address_t l_addr, ip4_address_t r_addr, u16 l_port,
427 u16 r_port, u8 proto, u32 rx_fib_index, u32 tx_sw_if_index,
428 snat_session_t **sessionp, vlib_node_runtime_t *node, u32 next,
429 u32 thread_index, f64 now)
431 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
432 ip4_address_t outside_addr;
435 u8 is_identity_nat = 0;
437 snat_session_t *s = NULL;
438 lb_nat_type_t lb = 0;
439 ip4_address_t daddr = r_addr;
443 (nat44_ed_maximum_sessions_exceeded (sm, rx_fib_index, thread_index)))
445 if (!nat_lru_free_one (sm, thread_index, now))
447 b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
448 nat_ipfix_logging_max_sessions (thread_index,
449 sm->max_translations_per_thread);
450 nat_elog_notice (sm, "maximum sessions exceeded");
451 return NAT_NEXT_DROP;
455 ip4_address_t sm_addr;
459 // First try to match static mapping by local address and port
460 if (!snat_static_mapping_match (vm, l_addr, l_port, rx_fib_index, proto,
461 &sm_addr, &sm_port, &sm_fib_index, 0, 0, 0,
462 &lb, 0, &is_identity_nat, 0))
464 if (PREDICT_FALSE (is_identity_nat))
472 if (PREDICT_TRUE (proto == IP_PROTOCOL_TCP))
474 if (PREDICT_FALSE (!tcp_flags_is_init (
475 vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)))
477 b->error = node->errors[NAT_IN2OUT_ED_ERROR_NON_SYN];
478 return NAT_NEXT_DROP;
482 s = nat_ed_session_alloc (sm, thread_index, now, proto);
485 tx_fib_index = get_tx_fib_index (rx_fib_index, r_addr);
489 s->in2out.addr = l_addr;
490 s->in2out.port = l_port;
492 s->in2out.fib_index = rx_fib_index;
493 s->out2in.fib_index = tx_fib_index;
495 // suggest using local port to allocation function
496 outside_port = l_port;
498 if (PREDICT_FALSE (nat44_ed_external_sm_lookup (sm, r_addr, r_port,
499 proto, &daddr, &dport)))
501 s->flags |= SNAT_SESSION_FLAG_HAIRPINNING;
504 // destination addr/port updated with real values in
505 // nat_ed_alloc_addr_and_port
506 nat_6t_o2i_flow_init (sm, thread_index, s, daddr, dport, daddr, 0,
507 s->out2in.fib_index, proto);
508 nat_6t_flow_daddr_rewrite_set (&s->o2i, l_addr.as_u32);
509 if (IP_PROTOCOL_ICMP == proto)
511 nat_6t_flow_icmp_id_rewrite_set (&s->o2i, l_port);
515 nat_6t_flow_dport_rewrite_set (&s->o2i, l_port);
517 nat_6t_flow_txfib_rewrite_set (&s->o2i, rx_fib_index);
519 if (nat_ed_alloc_addr_and_port (
520 sm, rx_fib_index, tx_sw_if_index, proto, thread_index, l_addr,
521 r_addr, tsm->snat_thread_index, s, &outside_addr, &outside_port))
523 nat_elog_notice (sm, "addresses exhausted");
524 b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS];
525 nat_ed_session_delete (sm, s, thread_index, 1);
526 return NAT_NEXT_DROP;
528 s->out2in.addr = outside_addr;
529 s->out2in.port = outside_port;
534 s->out2in.addr = outside_addr = sm_addr;
535 s->out2in.port = outside_port = sm_port;
536 s->in2out.addr = l_addr;
537 s->in2out.port = l_port;
539 s->in2out.fib_index = rx_fib_index;
540 s->out2in.fib_index = tx_fib_index;
541 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
544 int is_hairpinning = nat44_ed_external_sm_lookup (sm, r_addr, r_port,
545 proto, &daddr, &dport);
546 s->flags |= is_hairpinning * SNAT_SESSION_FLAG_HAIRPINNING;
548 if (IP_PROTOCOL_ICMP == proto)
550 nat_6t_o2i_flow_init (sm, thread_index, s, daddr, sm_port, sm_addr,
551 sm_port, s->out2in.fib_index, proto);
552 nat_6t_flow_icmp_id_rewrite_set (&s->o2i, l_port);
556 nat_6t_o2i_flow_init (sm, thread_index, s, daddr, dport, sm_addr,
557 sm_port, s->out2in.fib_index, proto);
558 nat_6t_flow_dport_rewrite_set (&s->o2i, l_port);
560 nat_6t_flow_daddr_rewrite_set (&s->o2i, l_addr.as_u32);
561 nat_6t_flow_txfib_rewrite_set (&s->o2i, rx_fib_index);
562 if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 2))
564 nat_elog_notice (sm, "out2in key add failed");
570 s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
571 s->ext_host_addr = r_addr;
572 s->ext_host_port = r_port;
574 nat_6t_i2o_flow_init (sm, thread_index, s, l_addr, l_port, r_addr, r_port,
575 rx_fib_index, proto);
576 nat_6t_flow_saddr_rewrite_set (&s->i2o, outside_addr.as_u32);
577 nat_6t_flow_daddr_rewrite_set (&s->i2o, daddr.as_u32);
579 if (IP_PROTOCOL_ICMP == proto)
581 nat_6t_flow_icmp_id_rewrite_set (&s->i2o, outside_port);
585 nat_6t_flow_sport_rewrite_set (&s->i2o, outside_port);
586 nat_6t_flow_dport_rewrite_set (&s->i2o, dport);
588 nat_6t_flow_txfib_rewrite_set (&s->i2o, tx_fib_index);
590 if (nat_ed_ses_i2o_flow_hash_add_del (sm, thread_index, s, 1))
592 nat_elog_notice (sm, "in2out key add failed");
597 nat_ipfix_logging_nat44_ses_create (
598 thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32, s->proto,
599 s->in2out.port, s->out2in.port, s->in2out.fib_index);
601 nat_syslog_nat44_sadd (0, s->in2out.fib_index, &s->in2out.addr,
602 s->in2out.port, &s->ext_host_nat_addr,
603 s->ext_host_nat_port, &s->out2in.addr, s->out2in.port,
604 &s->ext_host_addr, s->ext_host_port, s->proto, 0);
606 per_vrf_sessions_register_session (s, thread_index);
613 nat_ed_session_delete (sm, s, thread_index, 1);
615 *sessionp = s = NULL;
616 return NAT_NEXT_DROP;
619 static_always_inline int
620 nat44_ed_not_translate (vlib_main_t *vm, vlib_node_runtime_t *node,
621 u32 sw_if_index, vlib_buffer_t *b, ip4_header_t *ip,
622 u32 proto, u32 rx_fib_index)
624 snat_main_t *sm = &snat_main;
626 clib_bihash_kv_16_8_t kv, value;
627 ip4_address_t placeholder_addr;
628 u32 placeholder_fib_index;
629 u16 placeholder_port;
631 init_ed_k (&kv, ip->dst_address.as_u32,
632 vnet_buffer (b)->ip.reass.l4_dst_port, ip->src_address.as_u32,
633 vnet_buffer (b)->ip.reass.l4_src_port, sm->outside_fib_index,
636 // do nat if active session or is static mapping
637 if (!clib_bihash_search_16_8 (&sm->flow_hash, &kv, &value) ||
638 !snat_static_mapping_match (
639 vm, ip->dst_address, vnet_buffer (b)->ip.reass.l4_dst_port,
640 sm->outside_fib_index, proto, &placeholder_addr, &placeholder_port,
641 &placeholder_fib_index, 1, 0, 0, 0, 0, 0, 0))
646 // do not nat if forwarding enabled
647 if (sm->forwarding_enabled)
652 // do not nat packet aimed at the interface address
654 is_interface_addr (sm, node, sw_if_index, ip->dst_address.as_u32)))
659 // do nat packets with resolvable destination
660 // destination can be resolved either by:
661 // a) vrf routing table entry
662 // b) (non output feature) outside interface fib
663 if (is_destination_resolvable (rx_fib_index, ip->dst_address))
671 static_always_inline int
672 nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip,
673 u32 thread_index, f64 now,
674 vlib_main_t * vm, vlib_buffer_t * b)
676 clib_bihash_kv_16_8_t kv, value;
677 snat_session_t *s = 0;
678 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
680 if (!sm->forwarding_enabled)
683 if (ip->protocol == IP_PROTOCOL_ICMP)
685 ip4_address_t lookup_saddr, lookup_daddr;
686 u16 lookup_sport, lookup_dport;
688 if (nat_get_icmp_session_lookup_values (b, ip, &lookup_saddr,
689 &lookup_sport, &lookup_daddr,
690 &lookup_dport, &lookup_protocol))
692 init_ed_k (&kv, lookup_saddr.as_u32, lookup_sport, lookup_daddr.as_u32,
693 lookup_dport, 0, lookup_protocol);
695 else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
697 init_ed_k (&kv, ip->src_address.as_u32,
698 vnet_buffer (b)->ip.reass.l4_src_port, ip->dst_address.as_u32,
699 vnet_buffer (b)->ip.reass.l4_dst_port, 0, ip->protocol);
703 init_ed_k (&kv, ip->src_address.as_u32, 0, ip->dst_address.as_u32, 0, 0,
707 if (!clib_bihash_search_16_8 (&sm->flow_hash, &kv, &value))
709 ASSERT (thread_index == ed_value_get_thread_index (&value));
711 pool_elt_at_index (tsm->sessions,
712 ed_value_get_session_index (&value));
714 if (na44_ed_is_fwd_bypass_session (s))
716 if (ip->protocol == IP_PROTOCOL_TCP)
718 nat44_set_tcp_session_state_i2o (
719 sm, now, s, vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags,
723 nat44_session_update_counters (s, now,
724 vlib_buffer_length_in_chain (vm, b),
726 /* Per-user LRU list maintenance */
727 nat44_session_update_lru (sm, s, thread_index);
737 static_always_inline int
738 nat44_ed_not_translate_output_feature (snat_main_t *sm, vlib_buffer_t *b,
739 ip4_header_t *ip, u16 src_port,
740 u16 dst_port, u32 thread_index,
741 u32 rx_sw_if_index, u32 tx_sw_if_index,
744 clib_bihash_kv_16_8_t kv, value;
745 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
748 u32 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (rx_sw_if_index);
749 u32 tx_fib_index = ip4_fib_table_get_index_for_sw_if_index (tx_sw_if_index);
752 init_ed_k (&kv, ip->src_address.as_u32, src_port, ip->dst_address.as_u32,
753 dst_port, tx_fib_index, ip->protocol);
754 if (!clib_bihash_search_16_8 (&sm->flow_hash, &kv, &value))
756 ASSERT (thread_index == ed_value_get_thread_index (&value));
758 pool_elt_at_index (tsm->sessions,
759 ed_value_get_session_index (&value));
764 if (is_multi_worker &&
765 PREDICT_TRUE (!pool_is_free_index (
766 tsm->sessions, vnet_buffer2 (b)->nat.cached_dst_nat_session_index)))
769 lookup.fib_index = rx_fib_index;
770 lookup.proto = ip->protocol;
771 lookup.daddr.as_u32 = ip->src_address.as_u32;
772 lookup.dport = src_port;
773 lookup.saddr.as_u32 = ip->dst_address.as_u32;
774 lookup.sport = dst_port;
775 s = pool_elt_at_index (
776 tsm->sessions, vnet_buffer2 (b)->nat.cached_dst_nat_session_index);
777 if (PREDICT_TRUE (nat_6t_t_eq (&s->i2o.match, &lookup)))
779 goto skip_dst_nat_lookup;
784 init_ed_k (&kv, ip->dst_address.as_u32, dst_port, ip->src_address.as_u32,
785 src_port, rx_fib_index, ip->protocol);
786 if (!clib_bihash_search_16_8 (&sm->flow_hash, &kv, &value))
788 ASSERT (thread_index == ed_value_get_thread_index (&value));
790 pool_elt_at_index (tsm->sessions,
791 ed_value_get_session_index (&value));
794 if (na44_ed_is_fwd_bypass_session (s))
798 pool_foreach (i, sm->output_feature_interfaces)
800 if ((nat44_ed_is_interface_inside (i)) &&
801 (rx_sw_if_index == i->sw_if_index))
811 icmp_in2out_ed_slow_path (snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip,
812 icmp46_header_t *icmp, u32 sw_if_index,
813 u32 tx_sw_if_index, u32 rx_fib_index,
814 vlib_node_runtime_t *node, u32 next, f64 now,
815 u32 thread_index, snat_session_t **s_p,
818 vlib_main_t *vm = vlib_get_main ();
821 snat_session_t *s = NULL;
822 u8 lookup_protocol = ip->protocol;
823 u16 lookup_sport, lookup_dport;
824 ip4_address_t lookup_saddr, lookup_daddr;
826 err = nat_get_icmp_session_lookup_values (b, ip, &lookup_saddr,
827 &lookup_sport, &lookup_daddr,
828 &lookup_dport, &lookup_protocol);
831 b->error = node->errors[err];
832 return NAT_NEXT_DROP;
835 if (tx_sw_if_index != ~0)
837 if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (
838 sm, b, ip, lookup_sport, lookup_dport, thread_index, sw_if_index,
839 tx_sw_if_index, is_multi_worker)))
846 if (PREDICT_FALSE (nat44_ed_not_translate (
847 vm, node, sw_if_index, b, ip, IP_PROTOCOL_ICMP, rx_fib_index)))
853 if (PREDICT_FALSE (icmp_type_is_error_message (
854 vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)))
856 b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
857 return NAT_NEXT_DROP;
861 slow_path_ed (vm, sm, b, ip->src_address, ip->dst_address, lookup_sport,
862 lookup_dport, ip->protocol, rx_fib_index, tx_sw_if_index, &s,
863 node, next, thread_index, vlib_time_now (vm));
865 if (NAT_NEXT_DROP == next)
868 if (PREDICT_TRUE (!ip4_is_fragment (ip)))
870 ip_csum_t sum = ip_incremental_checksum_buffer (
871 vm, b, (u8 *) icmp - (u8 *) vlib_buffer_get_current (b),
872 ntohs (ip->length) - ip4_header_bytes (ip), 0);
873 checksum = ~ip_csum_fold (sum);
874 if (PREDICT_FALSE (checksum != 0 && checksum != 0xffff))
876 next = NAT_NEXT_DROP;
882 if (PREDICT_TRUE (next != NAT_NEXT_DROP && s))
885 nat44_session_update_counters (
886 s, now, vlib_buffer_length_in_chain (vm, b), thread_index);
887 /* Per-user LRU list maintenance */
888 nat44_session_update_lru (sm, s, thread_index);
894 static snat_session_t *
895 nat44_ed_in2out_slowpath_unknown_proto (snat_main_t *sm, vlib_buffer_t *b,
896 ip4_header_t *ip, u32 rx_fib_index,
897 u32 thread_index, f64 now,
899 vlib_node_runtime_t *node)
901 clib_bihash_kv_16_8_t s_kv, s_value;
902 snat_static_mapping_t *m = NULL;
903 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
904 snat_session_t *s = NULL;
907 ip4_address_t new_src_addr = { 0 };
908 ip4_address_t new_dst_addr = ip->dst_address;
911 nat44_ed_maximum_sessions_exceeded (sm, rx_fib_index, thread_index)))
913 b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
914 nat_ipfix_logging_max_sessions (thread_index,
915 sm->max_translations_per_thread);
916 nat_elog_notice (sm, "maximum sessions exceeded");
920 tx_fib_index = get_tx_fib_index (rx_fib_index, ip->dst_address);
922 // Try to find static mapping first
923 m = nat44_ed_sm_i2o_lookup (sm, ip->src_address, 0, rx_fib_index,
927 new_src_addr = m->external_addr;
931 pool_foreach (s, tsm->sessions)
933 if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
935 init_ed_k (&s_kv, s->out2in.addr.as_u32, 0,
936 ip->dst_address.as_u32, 0, tx_fib_index,
938 if (clib_bihash_search_16_8 (&sm->flow_hash, &s_kv, &s_value))
940 new_src_addr = s->out2in.addr;
946 if (!new_src_addr.as_u32)
948 for (i = 0; i < vec_len (sm->addresses); i++)
950 init_ed_k (&s_kv, sm->addresses[i].addr.as_u32, 0,
951 ip->dst_address.as_u32, 0, tx_fib_index,
953 if (clib_bihash_search_16_8 (&sm->flow_hash, &s_kv, &s_value))
955 new_src_addr = sm->addresses[i].addr;
961 if (!new_src_addr.as_u32)
963 // could not allocate address for translation ...
967 s = nat_ed_session_alloc (sm, thread_index, now, ip->protocol);
970 b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
971 nat_elog_warn (sm, "create NAT session failed");
975 nat_6t_i2o_flow_init (sm, thread_index, s, ip->src_address, 0,
976 ip->dst_address, 0, rx_fib_index, ip->protocol);
977 nat_6t_flow_saddr_rewrite_set (&s->i2o, new_src_addr.as_u32);
978 nat_6t_flow_txfib_rewrite_set (&s->i2o, tx_fib_index);
981 int is_hairpinning = nat44_ed_external_sm_lookup (
982 sm, ip->dst_address, 0, ip->protocol, &new_dst_addr, NULL);
983 s->flags |= is_hairpinning * SNAT_SESSION_FLAG_HAIRPINNING;
985 nat_6t_flow_daddr_rewrite_set (&s->i2o, new_dst_addr.as_u32);
986 nat_6t_flow_txfib_rewrite_set (&s->i2o, tx_fib_index);
988 nat_6t_o2i_flow_init (sm, thread_index, s, new_dst_addr, 0, new_src_addr, 0,
989 tx_fib_index, ip->protocol);
990 nat_6t_flow_saddr_rewrite_set (&s->o2i, ip->dst_address.as_u32);
991 nat_6t_flow_daddr_rewrite_set (&s->o2i, ip->src_address.as_u32);
992 nat_6t_flow_txfib_rewrite_set (&s->o2i, rx_fib_index);
994 s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
995 s->out2in.addr.as_u32 = new_src_addr.as_u32;
996 s->out2in.fib_index = tx_fib_index;
997 s->in2out.addr.as_u32 = ip->src_address.as_u32;
998 s->in2out.fib_index = rx_fib_index;
999 s->in2out.port = s->out2in.port = ip->protocol;
1001 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
1003 if (nat_ed_ses_i2o_flow_hash_add_del (sm, thread_index, s, 1))
1005 nat_elog_notice (sm, "in2out flow hash add failed");
1006 nat_ed_session_delete (sm, s, thread_index, 1);
1010 if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 1))
1012 nat_elog_notice (sm, "out2in flow hash add failed");
1013 nat_ed_session_delete (sm, s, thread_index, 1);
1017 per_vrf_sessions_register_session (s, thread_index);
1020 nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b),
1022 /* Per-user LRU list maintenance */
1023 nat44_session_update_lru (sm, s, thread_index);
1029 nat44_ed_in2out_fast_path_node_fn_inline (vlib_main_t *vm,
1030 vlib_node_runtime_t *node,
1031 vlib_frame_t *frame,
1032 int is_output_feature,
1033 int is_multi_worker)
1035 u32 n_left_from, *from;
1036 snat_main_t *sm = &snat_main;
1037 f64 now = vlib_time_now (vm);
1038 u32 thread_index = vm->thread_index;
1039 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
1040 u32 def_slow = is_output_feature ? NAT_NEXT_IN2OUT_ED_OUTPUT_SLOW_PATH
1041 : NAT_NEXT_IN2OUT_ED_SLOW_PATH;
1043 from = vlib_frame_vector_args (frame);
1044 n_left_from = frame->n_vectors;
1046 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
1047 u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
1048 vlib_get_buffers (vm, from, b, n_left_from);
1050 while (n_left_from > 0)
1053 u32 rx_sw_if_index0, rx_fib_index0, iph_offset0 = 0;
1054 u32 tx_sw_if_index0;
1055 u32 cntr_sw_if_index0;
1056 ip_protocol_t proto0;
1058 snat_session_t *s0 = 0;
1059 clib_bihash_kv_16_8_t kv0 = { 0 }, value0;
1060 nat_translation_error_e translation_error = NAT_ED_TRNSL_ERR_SUCCESS;
1061 nat_6t_flow_t *f = 0;
1063 int lookup_skipped = 0;
1068 /* Prefetch next iteration. */
1069 if (PREDICT_TRUE (n_left_from >= 2))
1075 vlib_prefetch_buffer_header (p2, LOAD);
1077 clib_prefetch_load (p2->data);
1080 if (is_output_feature)
1082 iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
1085 next[0] = vnet_buffer2 (b0)->nat.arc_next;
1088 (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) + iph_offset0);
1090 rx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1091 tx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
1093 is_output_feature ? tx_sw_if_index0 : rx_sw_if_index0;
1094 rx_fib_index0 = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1096 lookup.fib_index = rx_fib_index0;
1098 if (PREDICT_FALSE (!is_output_feature && ip0->ttl == 1))
1100 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1101 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1102 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1104 next[0] = NAT_NEXT_ICMP_ERROR;
1108 proto0 = ip0->protocol;
1110 if (is_output_feature)
1113 (nat_not_translate_output_feature_fwd
1114 (sm, ip0, thread_index, now, vm, b0)))
1118 if (PREDICT_FALSE (proto0 == IP_PROTOCOL_ICMP))
1120 if (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
1121 ICMP4_echo_request &&
1122 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
1124 !icmp_type_is_error_message (
1125 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags))
1127 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
1128 next[0] = NAT_NEXT_DROP;
1131 int err = nat_get_icmp_session_lookup_values (
1132 b0, ip0, &lookup.saddr, &lookup.sport, &lookup.daddr,
1133 &lookup.dport, &lookup.proto);
1136 b0->error = node->errors[err];
1137 next[0] = NAT_NEXT_DROP;
1143 lookup.proto = ip0->protocol;
1144 lookup.saddr.as_u32 = ip0->src_address.as_u32;
1145 lookup.daddr.as_u32 = ip0->dst_address.as_u32;
1146 lookup.sport = vnet_buffer (b0)->ip.reass.l4_src_port;
1147 lookup.dport = vnet_buffer (b0)->ip.reass.l4_dst_port;
1150 /* there might be a stashed index in vnet_buffer2 from handoff or
1151 * classify node, see if it can be used */
1152 if (is_multi_worker &&
1153 !pool_is_free_index (tsm->sessions,
1154 vnet_buffer2 (b0)->nat.cached_session_index))
1156 s0 = pool_elt_at_index (tsm->sessions,
1157 vnet_buffer2 (b0)->nat.cached_session_index);
1159 nat_6t_t_eq (&s0->i2o.match, &lookup)
1160 // for some hairpinning cases there are two "i2i" flows instead
1161 // of i2o and o2i as both hosts are on inside
1162 || (s0->flags & SNAT_SESSION_FLAG_HAIRPINNING &&
1163 nat_6t_t_eq (&s0->o2i.match, &lookup))))
1165 /* yes, this is the droid we're looking for */
1172 init_ed_k (&kv0, lookup.saddr.as_u32, lookup.sport, lookup.daddr.as_u32,
1173 lookup.dport, lookup.fib_index, lookup.proto);
1176 if (clib_bihash_search_16_8 (&sm->flow_hash, &kv0, &value0))
1178 // flow does not exist go slow path
1183 ASSERT (thread_index == ed_value_get_thread_index (&value0));
1185 pool_elt_at_index (tsm->sessions,
1186 ed_value_get_session_index (&value0));
1190 ASSERT (thread_index == s0->thread_index);
1192 if (PREDICT_FALSE (per_vrf_sessions_is_expired (s0, thread_index)))
1194 // session is closed, go slow path
1195 nat44_ed_free_session_data (sm, s0, thread_index, 0);
1196 nat_ed_session_delete (sm, s0, thread_index, 1);
1201 // drop if session expired
1202 u64 sess_timeout_time;
1204 s0->last_heard + (f64) nat44_session_get_timeout (sm, s0);
1205 if (now >= sess_timeout_time)
1207 nat44_ed_free_session_data (sm, s0, thread_index, 0);
1208 nat_ed_session_delete (sm, s0, thread_index, 1);
1209 // session is closed, go slow path
1214 b0->flags |= VNET_BUFFER_F_IS_NATED;
1216 if (nat_6t_t_eq (&s0->i2o.match, &lookup))
1220 else if (s0->flags & SNAT_SESSION_FLAG_HAIRPINNING &&
1221 nat_6t_t_eq (&s0->o2i.match, &lookup))
1227 translation_error = NAT_ED_TRNSL_ERR_FLOW_MISMATCH;
1228 nat44_ed_free_session_data (sm, s0, thread_index, 0);
1229 nat_ed_session_delete (sm, s0, thread_index, 1);
1230 next[0] = NAT_NEXT_DROP;
1231 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_TRNSL_FAILED];
1235 if (NAT_ED_TRNSL_ERR_SUCCESS !=
1236 (translation_error = nat_6t_flow_buf_translate_i2o (
1237 vm, sm, b0, ip0, f, proto0, is_output_feature)))
1239 nat44_ed_free_session_data (sm, s0, thread_index, 0);
1240 nat_ed_session_delete (sm, s0, thread_index, 1);
1241 next[0] = NAT_NEXT_DROP;
1242 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_TRNSL_FAILED];
1248 case IP_PROTOCOL_TCP:
1249 vlib_increment_simple_counter (&sm->counters.fastpath.in2out.tcp,
1250 thread_index, cntr_sw_if_index0, 1);
1251 nat44_set_tcp_session_state_i2o (
1252 sm, now, s0, vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags,
1255 case IP_PROTOCOL_UDP:
1256 vlib_increment_simple_counter (&sm->counters.fastpath.in2out.udp,
1257 thread_index, cntr_sw_if_index0, 1);
1259 case IP_PROTOCOL_ICMP:
1260 vlib_increment_simple_counter (&sm->counters.fastpath.in2out.icmp,
1261 thread_index, cntr_sw_if_index0, 1);
1264 vlib_increment_simple_counter (&sm->counters.fastpath.in2out.other,
1265 thread_index, cntr_sw_if_index0, 1);
1270 nat44_session_update_counters (s0, now,
1271 vlib_buffer_length_in_chain (vm, b0),
1273 /* Per-user LRU list maintenance */
1274 nat44_session_update_lru (sm, s0, thread_index);
1278 ((node->flags & VLIB_NODE_FLAG_TRACE)
1279 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1281 nat_in2out_ed_trace_t *t =
1282 vlib_add_trace (vm, node, b0, sizeof (*t));
1283 t->sw_if_index = rx_sw_if_index0;
1284 t->next_index = next[0];
1285 t->is_slow_path = 0;
1286 t->translation_error = translation_error;
1287 t->lookup_skipped = lookup_skipped;
1288 clib_memcpy (&t->search_key, &kv0, sizeof (t->search_key));
1292 t->session_index = s0 - tsm->sessions;
1293 clib_memcpy (&t->i2of, &s0->i2o, sizeof (t->i2of));
1294 clib_memcpy (&t->o2if, &s0->o2i, sizeof (t->o2if));
1295 t->translation_via_i2of = (&s0->i2o == f);
1296 t->tcp_state = s0->tcp_state;
1300 t->session_index = ~0;
1304 if (next[0] == NAT_NEXT_DROP)
1306 vlib_increment_simple_counter (&sm->counters.fastpath.in2out.drops,
1307 thread_index, cntr_sw_if_index0, 1);
1314 vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
1316 return frame->n_vectors;
1320 nat44_ed_in2out_slow_path_node_fn_inline (vlib_main_t *vm,
1321 vlib_node_runtime_t *node,
1322 vlib_frame_t *frame,
1323 int is_output_feature,
1324 int is_multi_worker)
1326 u32 n_left_from, *from;
1327 snat_main_t *sm = &snat_main;
1328 f64 now = vlib_time_now (vm);
1329 u32 thread_index = vm->thread_index;
1330 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
1332 from = vlib_frame_vector_args (frame);
1333 n_left_from = frame->n_vectors;
1335 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
1336 u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
1337 vlib_get_buffers (vm, from, b, n_left_from);
1339 while (n_left_from > 0)
1342 u32 rx_sw_if_index0, rx_fib_index0, iph_offset0 = 0;
1343 u32 tx_sw_if_index0;
1344 u32 cntr_sw_if_index0;
1345 ip_protocol_t proto0;
1348 icmp46_header_t *icmp0;
1349 snat_session_t *s0 = 0;
1350 clib_bihash_kv_16_8_t kv0 = { 0 }, value0;
1351 int translation_error = NAT_ED_TRNSL_ERR_SUCCESS;
1355 if (is_output_feature)
1356 iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
1358 next[0] = vnet_buffer2 (b0)->nat.arc_next;
1360 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1363 rx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1364 tx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
1366 is_output_feature ? tx_sw_if_index0 : rx_sw_if_index0;
1367 rx_fib_index0 = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1370 if (PREDICT_FALSE (!is_output_feature && ip0->ttl == 1))
1372 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1373 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1374 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1376 next[0] = NAT_NEXT_ICMP_ERROR;
1380 udp0 = ip4_next_header (ip0);
1381 icmp0 = (icmp46_header_t *) udp0;
1382 proto0 = ip0->protocol;
1384 if (PREDICT_FALSE (nat44_ed_is_unk_proto (proto0)))
1386 s0 = nat44_ed_in2out_slowpath_unknown_proto (
1387 sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node);
1389 next[0] = NAT_NEXT_DROP;
1391 if (NAT_NEXT_DROP != next[0] && s0 &&
1392 NAT_ED_TRNSL_ERR_SUCCESS !=
1393 (translation_error = nat_6t_flow_buf_translate_i2o (
1394 vm, sm, b0, ip0, &s0->i2o, proto0, is_output_feature)))
1396 nat44_ed_free_session_data (sm, s0, thread_index, 0);
1397 nat_ed_session_delete (sm, s0, thread_index, 1);
1398 next[0] = NAT_NEXT_DROP;
1399 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_TRNSL_FAILED];
1403 vlib_increment_simple_counter (&sm->counters.slowpath.in2out.other,
1404 thread_index, cntr_sw_if_index0, 1);
1408 if (PREDICT_FALSE (proto0 == IP_PROTOCOL_ICMP))
1410 next[0] = icmp_in2out_ed_slow_path (
1411 sm, b0, ip0, icmp0, rx_sw_if_index0, tx_sw_if_index0,
1412 rx_fib_index0, node, next[0], now, thread_index, &s0,
1414 if (NAT_NEXT_DROP != next[0] && s0 &&
1415 NAT_ED_TRNSL_ERR_SUCCESS !=
1416 (translation_error = nat_6t_flow_buf_translate_i2o (
1417 vm, sm, b0, ip0, &s0->i2o, proto0, is_output_feature)))
1419 nat44_ed_free_session_data (sm, s0, thread_index, 0);
1420 nat_ed_session_delete (sm, s0, thread_index, 1);
1421 next[0] = NAT_NEXT_DROP;
1422 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_TRNSL_FAILED];
1426 if (NAT_NEXT_DROP != next[0])
1428 vlib_increment_simple_counter (
1429 &sm->counters.slowpath.in2out.icmp, thread_index,
1430 cntr_sw_if_index0, 1);
1436 &kv0, ip0->src_address.as_u32, vnet_buffer (b0)->ip.reass.l4_src_port,
1437 ip0->dst_address.as_u32, vnet_buffer (b0)->ip.reass.l4_dst_port,
1438 rx_fib_index0, ip0->protocol);
1439 if (!clib_bihash_search_16_8 (&sm->flow_hash, &kv0, &value0))
1441 ASSERT (thread_index == ed_value_get_thread_index (&value0));
1443 pool_elt_at_index (tsm->sessions,
1444 ed_value_get_session_index (&value0));
1449 if (is_output_feature)
1451 if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (
1452 sm, b0, ip0, vnet_buffer (b0)->ip.reass.l4_src_port,
1453 vnet_buffer (b0)->ip.reass.l4_dst_port, thread_index,
1454 rx_sw_if_index0, tx_sw_if_index0, is_multi_worker)))
1458 * Send DHCP packets to the ipv4 stack, or we won't
1459 * be able to use dhcp client on the outside interface
1462 proto0 == IP_PROTOCOL_UDP &&
1463 (vnet_buffer (b0)->ip.reass.l4_dst_port ==
1464 clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_server)) &&
1465 ip0->dst_address.as_u32 == 0xffffffff))
1471 nat44_ed_not_translate (vm, node, rx_sw_if_index0, b0, ip0,
1472 proto0, rx_fib_index0)))
1477 slow_path_ed (vm, sm, b0, ip0->src_address, ip0->dst_address,
1478 vnet_buffer (b0)->ip.reass.l4_src_port,
1479 vnet_buffer (b0)->ip.reass.l4_dst_port,
1480 ip0->protocol, rx_fib_index0, tx_sw_if_index0, &s0,
1481 node, next[0], thread_index, now);
1483 if (PREDICT_FALSE (next[0] == NAT_NEXT_DROP))
1486 if (PREDICT_FALSE (!s0))
1491 b0->flags |= VNET_BUFFER_F_IS_NATED;
1493 if (NAT_ED_TRNSL_ERR_SUCCESS !=
1494 (translation_error = nat_6t_flow_buf_translate_i2o (
1495 vm, sm, b0, ip0, &s0->i2o, proto0, is_output_feature)))
1497 nat44_ed_free_session_data (sm, s0, thread_index, 0);
1498 nat_ed_session_delete (sm, s0, thread_index, 1);
1499 next[0] = NAT_NEXT_DROP;
1500 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_TRNSL_FAILED];
1504 if (PREDICT_TRUE (proto0 == IP_PROTOCOL_TCP))
1506 vlib_increment_simple_counter (&sm->counters.slowpath.in2out.tcp,
1507 thread_index, cntr_sw_if_index0, 1);
1508 nat44_set_tcp_session_state_i2o (
1509 sm, now, s0, vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags,
1514 vlib_increment_simple_counter (&sm->counters.slowpath.in2out.udp,
1515 thread_index, cntr_sw_if_index0, 1);
1519 nat44_session_update_counters (s0, now,
1520 vlib_buffer_length_in_chain
1521 (vm, b0), thread_index);
1522 /* Per-user LRU list maintenance */
1523 nat44_session_update_lru (sm, s0, thread_index);
1526 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1527 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1529 nat_in2out_ed_trace_t *t =
1530 vlib_add_trace (vm, node, b0, sizeof (*t));
1531 t->sw_if_index = rx_sw_if_index0;
1532 t->next_index = next[0];
1533 t->is_slow_path = 1;
1534 t->translation_error = translation_error;
1535 clib_memcpy (&t->search_key, &kv0, sizeof (t->search_key));
1539 t->session_index = s0 - tsm->sessions;
1540 clib_memcpy (&t->i2of, &s0->i2o, sizeof (t->i2of));
1541 clib_memcpy (&t->o2if, &s0->o2i, sizeof (t->o2if));
1542 t->translation_via_i2of = 1;
1543 t->tcp_state = s0->tcp_state;
1548 t->session_index = ~0;
1552 if (next[0] == NAT_NEXT_DROP)
1554 vlib_increment_simple_counter (&sm->counters.slowpath.in2out.drops,
1555 thread_index, cntr_sw_if_index0, 1);
1563 vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
1566 return frame->n_vectors;
1569 VLIB_NODE_FN (nat44_ed_in2out_node) (vlib_main_t * vm,
1570 vlib_node_runtime_t * node,
1571 vlib_frame_t * frame)
1573 if (snat_main.num_workers > 1)
1575 return nat44_ed_in2out_fast_path_node_fn_inline (vm, node, frame, 0, 1);
1579 return nat44_ed_in2out_fast_path_node_fn_inline (vm, node, frame, 0, 0);
1583 VLIB_REGISTER_NODE (nat44_ed_in2out_node) = {
1584 .name = "nat44-ed-in2out",
1585 .vector_size = sizeof (u32),
1586 .sibling_of = "nat-default",
1587 .format_trace = format_nat_in2out_ed_trace,
1588 .type = VLIB_NODE_TYPE_INTERNAL,
1589 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1590 .error_strings = nat_in2out_ed_error_strings,
1591 .runtime_data_bytes = sizeof (snat_runtime_t),
1594 VLIB_NODE_FN (nat44_ed_in2out_output_node) (vlib_main_t * vm,
1595 vlib_node_runtime_t * node,
1596 vlib_frame_t * frame)
1598 if (snat_main.num_workers > 1)
1600 return nat44_ed_in2out_fast_path_node_fn_inline (vm, node, frame, 1, 1);
1604 return nat44_ed_in2out_fast_path_node_fn_inline (vm, node, frame, 1, 0);
1608 VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = {
1609 .name = "nat44-ed-in2out-output",
1610 .vector_size = sizeof (u32),
1611 .sibling_of = "nat-default",
1612 .format_trace = format_nat_in2out_ed_trace,
1613 .type = VLIB_NODE_TYPE_INTERNAL,
1614 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1615 .error_strings = nat_in2out_ed_error_strings,
1616 .runtime_data_bytes = sizeof (snat_runtime_t),
1619 VLIB_NODE_FN (nat44_ed_in2out_slowpath_node) (vlib_main_t * vm,
1620 vlib_node_runtime_t *
1621 node, vlib_frame_t * frame)
1623 if (snat_main.num_workers > 1)
1625 return nat44_ed_in2out_slow_path_node_fn_inline (vm, node, frame, 0, 1);
1629 return nat44_ed_in2out_slow_path_node_fn_inline (vm, node, frame, 0, 0);
1633 VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = {
1634 .name = "nat44-ed-in2out-slowpath",
1635 .vector_size = sizeof (u32),
1636 .sibling_of = "nat-default",
1637 .format_trace = format_nat_in2out_ed_trace,
1638 .type = VLIB_NODE_TYPE_INTERNAL,
1639 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1640 .error_strings = nat_in2out_ed_error_strings,
1641 .runtime_data_bytes = sizeof (snat_runtime_t),
1644 VLIB_NODE_FN (nat44_ed_in2out_output_slowpath_node) (vlib_main_t * vm,
1647 vlib_frame_t * frame)
1649 if (snat_main.num_workers > 1)
1651 return nat44_ed_in2out_slow_path_node_fn_inline (vm, node, frame, 1, 1);
1655 return nat44_ed_in2out_slow_path_node_fn_inline (vm, node, frame, 1, 0);
1659 VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = {
1660 .name = "nat44-ed-in2out-output-slowpath",
1661 .vector_size = sizeof (u32),
1662 .sibling_of = "nat-default",
1663 .format_trace = format_nat_in2out_ed_trace,
1664 .type = VLIB_NODE_TYPE_INTERNAL,
1665 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1666 .error_strings = nat_in2out_ed_error_strings,
1667 .runtime_data_bytes = sizeof (snat_runtime_t),
1671 format_nat_pre_trace (u8 * s, va_list * args)
1673 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1674 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1675 nat_pre_trace_t *t = va_arg (*args, nat_pre_trace_t *);
1676 return format (s, "in2out next_index %d arc_next_index %d", t->next_index,
1680 VLIB_NODE_FN (nat_pre_in2out_node)
1681 (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1683 return nat_pre_node_fn_inline (vm, node, frame,
1684 NAT_NEXT_IN2OUT_ED_FAST_PATH);
1687 VLIB_NODE_FN (nat_pre_in2out_output_node)
1688 (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1690 return nat_pre_node_fn_inline (vm, node, frame,
1691 NAT_NEXT_IN2OUT_ED_OUTPUT_FAST_PATH);
1694 VLIB_REGISTER_NODE (nat_pre_in2out_node) = {
1695 .name = "nat-pre-in2out",
1696 .vector_size = sizeof (u32),
1697 .sibling_of = "nat-default",
1698 .format_trace = format_nat_pre_trace,
1699 .type = VLIB_NODE_TYPE_INTERNAL,
1703 VLIB_REGISTER_NODE (nat_pre_in2out_output_node) = {
1704 .name = "nat-pre-in2out-output",
1705 .vector_size = sizeof (u32),
1706 .sibling_of = "nat-default",
1707 .format_trace = format_nat_pre_trace,
1708 .type = VLIB_NODE_TYPE_INTERNAL,
1713 * fd.io coding-style-patch-verification: ON
1716 * eval: (c-set-style "gnu")