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/pg/pg.h>
23 #include <vnet/ip/ip.h>
24 #include <vnet/ethernet/ethernet.h>
25 #include <vnet/fib/ip4_fib.h>
26 #include <vnet/udp/udp.h>
27 #include <vppinfra/error.h>
29 #include <nat/nat_ipfix_logging.h>
30 #include <nat/nat_inlines.h>
31 #include <nat/nat44/inlines.h>
32 #include <nat/nat_syslog.h>
33 #include <nat/nat_ha.h>
35 static char *nat_out2in_ed_error_strings[] = {
36 #define _(sym,string) string,
37 foreach_nat_out2in_ed_error
47 } nat44_ed_out2in_trace_t;
50 format_nat44_ed_out2in_trace (u8 * s, va_list * args)
52 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
53 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
54 nat44_ed_out2in_trace_t *t = va_arg (*args, nat44_ed_out2in_trace_t *);
58 t->is_slow_path ? "NAT44_OUT2IN_ED_SLOW_PATH" :
59 "NAT44_OUT2IN_ED_FAST_PATH";
61 s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
62 t->sw_if_index, t->next_index, t->session_index);
68 icmp_out2in_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
69 ip4_header_t * ip0, icmp46_header_t * icmp0,
70 u32 sw_if_index0, u32 rx_fib_index0,
71 vlib_node_runtime_t * node, u32 next0, f64 now,
72 u32 thread_index, snat_session_t ** p_s0)
74 next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
75 next0, thread_index, p_s0, 0);
76 snat_session_t *s0 = *p_s0;
77 if (PREDICT_TRUE (next0 != NAT_NEXT_DROP && s0))
80 nat44_session_update_counters (s0, now,
81 vlib_buffer_length_in_chain
82 (sm->vlib_main, b0), thread_index);
83 /* Per-user LRU list maintenance */
84 nat44_session_update_lru (sm, s0, thread_index);
89 #ifndef CLIB_MARCH_VARIANT
91 nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
93 snat_main_t *sm = &snat_main;
94 nat44_is_idle_session_ctx_t *ctx = arg;
96 u64 sess_timeout_time;
97 nat_ed_ses_key_t ed_key;
98 clib_bihash_kv_16_8_t ed_kv;
101 snat_session_key_t key;
102 snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
105 s = pool_elt_at_index (tsm->sessions, kv->value);
106 sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
107 if (ctx->now >= sess_timeout_time)
109 ed_key.l_addr = s->in2out.addr;
110 ed_key.r_addr = s->ext_host_addr;
111 ed_key.fib_index = s->in2out.fib_index;
112 if (snat_is_unk_proto_session (s))
114 ed_key.proto = s->in2out.port;
120 ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol);
121 ed_key.l_port = s->in2out.port;
122 ed_key.r_port = s->ext_host_port;
124 if (is_twice_nat_session (s))
126 ed_key.r_addr = s->ext_host_nat_addr;
127 ed_key.r_port = s->ext_host_nat_port;
129 ed_kv.key[0] = ed_key.as_u64[0];
130 ed_kv.key[1] = ed_key.as_u64[1];
131 if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &ed_kv, 0))
132 nat_elog_warn ("in2out_ed key del failed");
134 if (snat_is_unk_proto_session (s))
137 snat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
138 s->in2out.addr.as_u32,
139 s->out2in.addr.as_u32,
143 s->in2out.fib_index);
145 nat_syslog_nat44_sdel (s->user_index, s->in2out.fib_index,
146 &s->in2out.addr, s->in2out.port,
147 &s->ext_host_nat_addr, s->ext_host_nat_port,
148 &s->out2in.addr, s->out2in.port,
149 &s->ext_host_addr, s->ext_host_port,
150 s->in2out.protocol, is_twice_nat_session (s));
152 nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
153 s->ext_host_port, s->out2in.protocol, s->out2in.fib_index,
156 if (is_twice_nat_session (s))
158 for (i = 0; i < vec_len (sm->twice_nat_addresses); i++)
160 key.protocol = s->in2out.protocol;
161 key.port = s->ext_host_nat_port;
162 a = sm->twice_nat_addresses + i;
163 if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
165 snat_free_outside_address_and_port (sm->twice_nat_addresses,
173 if (snat_is_session_static (s))
176 snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
179 nat44_delete_session (sm, s, ctx->thread_index);
187 static snat_session_t *
188 create_session_for_static_mapping_ed (snat_main_t * sm,
190 snat_session_key_t l_key,
191 snat_session_key_t e_key,
192 vlib_node_runtime_t * node,
194 twice_nat_type_t twice_nat,
195 lb_nat_type_t lb_nat, f64 now)
201 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
202 clib_bihash_kv_16_8_t kv;
203 snat_session_key_t eh_key;
204 nat44_is_idle_session_ctx_t ctx;
206 nat44_session_try_cleanup (&l_key.addr, l_key.fib_index, thread_index, now);
208 if (PREDICT_FALSE (nat44_maximum_sessions_exceeded (sm, thread_index)))
210 b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED];
211 nat_elog_notice ("maximum sessions exceeded");
215 u = nat_user_get_or_create (sm, &l_key.addr, l_key.fib_index, thread_index);
218 nat_elog_warn ("create NAT user failed");
222 s = nat_ed_session_alloc (sm, u, thread_index, now);
225 nat44_delete_user_with_no_session (sm, u, thread_index);
226 nat_elog_warn ("create NAT session failed");
230 ip = vlib_buffer_get_current (b);
231 udp = ip4_next_header (ip);
233 s->ext_host_addr.as_u32 = ip->src_address.as_u32;
234 s->ext_host_port = e_key.protocol == SNAT_PROTOCOL_ICMP ? 0 : udp->src_port;
235 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
237 s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
238 if (lb_nat == AFFINITY_LB_NAT)
239 s->flags |= SNAT_SESSION_FLAG_AFFINITY;
240 s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
243 s->in2out.protocol = s->out2in.protocol;
244 user_session_increment (sm, u, 1);
246 /* Add to lookup tables */
247 make_ed_kv (&kv, &e_key.addr, &s->ext_host_addr, ip->protocol,
248 e_key.fib_index, e_key.port, s->ext_host_port);
249 kv.value = s - tsm->sessions;
251 ctx.thread_index = thread_index;
252 if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, &kv,
253 nat44_o2i_ed_is_idle_session_cb,
255 nat_elog_notice ("out2in-ed key add failed");
257 if (twice_nat == TWICE_NAT || (twice_nat == TWICE_NAT_SELF &&
258 ip->src_address.as_u32 == l_key.addr.as_u32))
260 eh_key.protocol = e_key.protocol;
261 if (snat_alloc_outside_address_and_port (sm->twice_nat_addresses, 0,
262 thread_index, &eh_key,
264 tsm->snat_thread_index))
266 b->error = node->errors[NAT_OUT2IN_ED_ERROR_OUT_OF_PORTS];
267 nat44_delete_session (sm, s, thread_index);
268 if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &kv, 0))
269 nat_elog_notice ("out2in-ed key del failed");
272 s->ext_host_nat_addr.as_u32 = eh_key.addr.as_u32;
273 s->ext_host_nat_port = eh_key.port;
274 s->flags |= SNAT_SESSION_FLAG_TWICE_NAT;
275 make_ed_kv (&kv, &l_key.addr, &s->ext_host_nat_addr, ip->protocol,
276 l_key.fib_index, l_key.port, s->ext_host_nat_port);
280 make_ed_kv (&kv, &l_key.addr, &s->ext_host_addr, ip->protocol,
281 l_key.fib_index, l_key.port, s->ext_host_port);
283 kv.value = s - tsm->sessions;
284 if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, &kv,
285 nat44_i2o_ed_is_idle_session_cb,
287 nat_elog_notice ("in2out-ed key add failed");
289 snat_ipfix_logging_nat44_ses_create (thread_index,
290 s->in2out.addr.as_u32,
291 s->out2in.addr.as_u32,
294 s->out2in.port, s->in2out.fib_index);
296 nat_syslog_nat44_sadd (s->user_index, s->in2out.fib_index,
297 &s->in2out.addr, s->in2out.port,
298 &s->ext_host_nat_addr, s->ext_host_nat_port,
299 &s->out2in.addr, s->out2in.port,
300 &s->ext_host_addr, s->ext_host_port,
301 s->in2out.protocol, is_twice_nat_session (s));
303 nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
304 s->out2in.port, &s->ext_host_addr, s->ext_host_port,
305 &s->ext_host_nat_addr, s->ext_host_nat_port,
306 s->in2out.protocol, s->in2out.fib_index, s->flags,
313 next_src_nat (snat_main_t * sm, ip4_header_t * ip, u8 proto, u16 src_port,
314 u16 dst_port, u32 thread_index, u32 rx_fib_index)
316 clib_bihash_kv_16_8_t kv, value;
317 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
319 make_ed_kv (&kv, &ip->src_address, &ip->dst_address, proto,
320 rx_fib_index, src_port, dst_port);
321 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
328 create_bypass_for_fwd (snat_main_t * sm, vlib_buffer_t * b, ip4_header_t * ip,
329 u32 rx_fib_index, u32 thread_index)
331 nat_ed_ses_key_t key;
332 clib_bihash_kv_16_8_t kv, value;
335 snat_session_t *s = 0;
336 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
337 f64 now = vlib_time_now (sm->vlib_main);
339 if (ip->protocol == IP_PROTOCOL_ICMP)
341 if (get_icmp_o2i_ed_key (b, ip, &key))
344 else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
346 udp = ip4_next_header (ip);
347 key.r_addr = ip->src_address;
348 key.l_addr = ip->dst_address;
349 key.proto = ip->protocol;
350 key.l_port = udp->dst_port;
351 key.r_port = udp->src_port;
355 key.r_addr = ip->src_address;
356 key.l_addr = ip->dst_address;
357 key.proto = ip->protocol;
358 key.l_port = key.r_port = 0;
361 kv.key[0] = key.as_u64[0];
362 kv.key[1] = key.as_u64[1];
364 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
366 s = pool_elt_at_index (tsm->sessions, value.value);
372 if (PREDICT_FALSE (nat44_maximum_sessions_exceeded (sm, thread_index)))
375 u = nat_user_get_or_create (sm, &ip->dst_address, sm->inside_fib_index,
379 nat_elog_warn ("create NAT user failed");
383 s = nat_ed_session_alloc (sm, u, thread_index, now);
386 nat44_delete_user_with_no_session (sm, u, thread_index);
387 nat_elog_warn ("create NAT session failed");
391 proto = ip_proto_to_snat_proto (key.proto);
393 s->ext_host_addr = key.r_addr;
394 s->ext_host_port = key.r_port;
395 s->flags |= SNAT_SESSION_FLAG_FWD_BYPASS;
396 s->out2in.addr = key.l_addr;
397 s->out2in.port = key.l_port;
398 s->out2in.protocol = proto;
401 s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
402 s->out2in.port = ip->protocol;
404 s->out2in.fib_index = 0;
405 s->in2out = s->out2in;
406 user_session_increment (sm, u, 0);
408 kv.value = s - tsm->sessions;
409 if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &kv, 1))
410 nat_elog_notice ("in2out_ed key add failed");
413 if (ip->protocol == IP_PROTOCOL_TCP)
415 tcp_header_t *tcp = ip4_next_header (ip);
416 if (nat44_set_tcp_session_state_o2i
417 (sm, s, tcp->flags, tcp->ack_number, tcp->seq_number, thread_index))
422 nat44_session_update_counters (s, now, 0, thread_index);
423 /* Per-user LRU list maintenance */
424 nat44_session_update_lru (sm, s, thread_index);
428 create_bypass_for_fwd_worker (snat_main_t * sm, vlib_buffer_t * b,
429 ip4_header_t * ip, u32 rx_fib_index)
431 ip4_header_t ip_wkr = {
432 .src_address = ip->dst_address,
434 u32 thread_index = sm->worker_in2out_cb (&ip_wkr, rx_fib_index, 0);
436 create_bypass_for_fwd (sm, b, ip, rx_fib_index, thread_index);
439 #ifndef CLIB_MARCH_VARIANT
441 icmp_match_out2in_ed (snat_main_t * sm, vlib_node_runtime_t * node,
442 u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip,
443 u8 * p_proto, snat_session_key_t * p_value,
444 u8 * p_dont_translate, void *d, void *e)
446 u32 next = ~0, sw_if_index, rx_fib_index;
447 nat_ed_ses_key_t key;
448 clib_bihash_kv_16_8_t kv, value;
449 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
450 snat_session_t *s = 0;
451 u8 dont_translate = 0, is_addr_only, identity_nat;
452 snat_session_key_t e_key, l_key;
454 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
455 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
457 if (get_icmp_o2i_ed_key (b, ip, &key))
459 b->error = node->errors[NAT_OUT2IN_ED_ERROR_UNSUPPORTED_PROTOCOL];
460 next = NAT_NEXT_DROP;
463 key.fib_index = rx_fib_index;
464 kv.key[0] = key.as_u64[0];
465 kv.key[1] = key.as_u64[1];
467 if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
469 /* Try to match static mapping */
470 e_key.addr = ip->dst_address;
471 e_key.port = key.l_port;
472 e_key.protocol = ip_proto_to_snat_proto (key.proto);
473 e_key.fib_index = rx_fib_index;
474 if (snat_static_mapping_match
475 (sm, e_key, &l_key, 1, &is_addr_only, 0, 0, 0, &identity_nat))
477 if (!sm->forwarding_enabled)
479 /* Don't NAT packet aimed at the intfc address */
480 if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index,
481 ip->dst_address.as_u32)))
486 b->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
487 next = NAT_NEXT_DROP;
493 if (next_src_nat (sm, ip, key.proto, key.l_port, key.r_port,
494 thread_index, rx_fib_index))
496 next = NAT_NEXT_IN2OUT_ED_FAST_PATH;
499 if (sm->num_workers > 1)
500 create_bypass_for_fwd_worker (sm, b, ip, rx_fib_index);
502 create_bypass_for_fwd (sm, b, ip, rx_fib_index, thread_index);
508 (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
510 && (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
511 ICMP4_echo_request || !is_addr_only)))
513 b->error = node->errors[NAT_OUT2IN_ED_ERROR_BAD_ICMP_TYPE];
514 next = NAT_NEXT_DROP;
518 if (PREDICT_FALSE (identity_nat))
524 /* Create session initiated by host from external network */
525 s = create_session_for_static_mapping_ed (sm, b, l_key, e_key, node,
532 next = NAT_NEXT_DROP;
539 (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
541 && vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags !=
543 && !icmp_type_is_error_message (vnet_buffer (b)->ip.
544 reass.icmp_type_or_tcp_flags)))
546 b->error = node->errors[NAT_OUT2IN_ED_ERROR_BAD_ICMP_TYPE];
547 next = NAT_NEXT_DROP;
551 s = pool_elt_at_index (tsm->sessions, value.value);
554 *p_proto = ip_proto_to_snat_proto (key.proto);
557 *p_value = s->in2out;
558 *p_dont_translate = dont_translate;
560 *(snat_session_t **) d = s;
565 static snat_session_t *
566 nat44_ed_out2in_unknown_proto (snat_main_t * sm,
572 vlib_main_t * vm, vlib_node_runtime_t * node)
574 clib_bihash_kv_8_8_t kv, value;
575 clib_bihash_kv_16_8_t s_kv, s_value;
576 snat_static_mapping_t *m;
577 u32 old_addr, new_addr;
580 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
583 old_addr = ip->dst_address.as_u32;
585 make_ed_kv (&s_kv, &ip->dst_address, &ip->src_address, ip->protocol,
588 if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
590 s = pool_elt_at_index (tsm->sessions, s_value.value);
591 new_addr = ip->dst_address.as_u32 = s->in2out.addr.as_u32;
595 if (PREDICT_FALSE (nat44_maximum_sessions_exceeded (sm, thread_index)))
597 b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED];
598 nat_elog_notice ("maximum sessions exceeded");
602 make_sm_kv (&kv, &ip->dst_address, 0, 0, 0);
603 if (clib_bihash_search_8_8
604 (&sm->static_mapping_by_external, &kv, &value))
606 b->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
610 m = pool_elt_at_index (sm->static_mappings, value.value);
612 new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
614 u = nat_user_get_or_create (sm, &m->local_addr, m->fib_index,
618 nat_elog_warn ("create NAT user failed");
622 /* Create a new session */
623 s = nat_ed_session_alloc (sm, u, thread_index, now);
626 nat44_delete_user_with_no_session (sm, u, thread_index);
627 nat_elog_warn ("create NAT session failed");
631 s->ext_host_addr.as_u32 = ip->src_address.as_u32;
632 s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
633 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
634 s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
635 s->out2in.addr.as_u32 = old_addr;
636 s->out2in.fib_index = rx_fib_index;
637 s->in2out.addr.as_u32 = new_addr;
638 s->in2out.fib_index = m->fib_index;
639 s->in2out.port = s->out2in.port = ip->protocol;
640 user_session_increment (sm, u, 1);
642 /* Add to lookup tables */
643 s_kv.value = s - tsm->sessions;
644 if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1))
645 nat_elog_notice ("out2in key add failed");
647 make_ed_kv (&s_kv, &ip->dst_address, &ip->src_address, ip->protocol,
649 s_kv.value = s - tsm->sessions;
650 if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1))
651 nat_elog_notice ("in2out key add failed");
654 /* Update IP checksum */
656 sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
657 ip->checksum = ip_csum_fold (sum);
659 vnet_buffer (b)->sw_if_index[VLIB_TX] = s->in2out.fib_index;
662 nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b),
664 /* Per-user LRU list maintenance */
665 nat44_session_update_lru (sm, s, thread_index);
671 nat44_ed_out2in_node_fn_inline (vlib_main_t * vm,
672 vlib_node_runtime_t * node,
673 vlib_frame_t * frame, int is_slow_path)
675 u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
676 nat_next_t next_index;
677 snat_main_t *sm = &snat_main;
678 f64 now = vlib_time_now (vm);
679 u32 thread_index = vm->thread_index;
680 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
681 u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
684 stats_node_index = is_slow_path ? sm->ed_out2in_slowpath_node_index :
685 sm->ed_out2in_node_index;
687 from = vlib_frame_vector_args (frame);
688 n_left_from = frame->n_vectors;
689 next_index = node->cached_next_index;
691 while (n_left_from > 0)
695 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
697 while (n_left_from >= 4 && n_left_to_next >= 2)
700 vlib_buffer_t *b0, *b1;
701 u32 next0, sw_if_index0, rx_fib_index0, proto0, old_addr0,
703 u32 next1, sw_if_index1, rx_fib_index1, proto1, old_addr1,
705 u16 old_port0, new_port0, old_port1, new_port1;
706 ip4_header_t *ip0, *ip1;
707 udp_header_t *udp0, *udp1;
708 tcp_header_t *tcp0, *tcp1;
709 icmp46_header_t *icmp0, *icmp1;
710 snat_session_t *s0 = 0, *s1 = 0;
711 clib_bihash_kv_16_8_t kv0, value0, kv1, value1;
712 ip_csum_t sum0, sum1;
713 snat_session_key_t e_key0, l_key0, e_key1, l_key1;
714 lb_nat_type_t lb_nat0, lb_nat1;
715 twice_nat_type_t twice_nat0, twice_nat1;
716 u8 identity_nat0, identity_nat1;
718 /* Prefetch next iteration. */
720 vlib_buffer_t *p2, *p3;
722 p2 = vlib_get_buffer (vm, from[2]);
723 p3 = vlib_get_buffer (vm, from[3]);
725 vlib_prefetch_buffer_header (p2, LOAD);
726 vlib_prefetch_buffer_header (p3, LOAD);
728 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
729 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
732 /* speculatively enqueue b0 and b1 to the current next frame */
733 to_next[0] = bi0 = from[0];
734 to_next[1] = bi1 = from[1];
740 b0 = vlib_get_buffer (vm, bi0);
741 b1 = vlib_get_buffer (vm, bi1);
743 next0 = nat_buffer_opaque (b0)->arc_next;
744 next1 = nat_buffer_opaque (b1)->arc_next;
746 vnet_buffer (b0)->snat.flags = 0;
747 ip0 = vlib_buffer_get_current (b0);
749 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
751 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
754 if (PREDICT_FALSE (ip0->ttl == 1))
756 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
757 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
758 ICMP4_time_exceeded_ttl_exceeded_in_transit,
760 next0 = NAT_NEXT_ICMP_ERROR;
764 udp0 = ip4_next_header (ip0);
765 tcp0 = (tcp_header_t *) udp0;
766 icmp0 = (icmp46_header_t *) udp0;
767 proto0 = ip_proto_to_snat_proto (ip0->protocol);
771 if (PREDICT_FALSE (proto0 == ~0))
774 nat44_ed_out2in_unknown_proto (sm, b0, ip0, rx_fib_index0,
775 thread_index, now, vm,
778 if (!sm->forwarding_enabled)
781 next0 = NAT_NEXT_DROP;
786 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
788 next0 = icmp_out2in_ed_slow_path
789 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
790 next0, now, thread_index, &s0);
797 if (PREDICT_FALSE (proto0 == ~0))
799 next0 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
803 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
805 next0 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
810 make_ed_kv (&kv0, &ip0->dst_address, &ip0->src_address,
811 ip0->protocol, rx_fib_index0,
812 vnet_buffer (b0)->ip.reass.l4_dst_port,
813 vnet_buffer (b0)->ip.reass.l4_src_port);
815 if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv0, &value0))
819 /* Try to match static mapping by external address and port,
820 destination address and port in packet */
821 e_key0.addr = ip0->dst_address;
822 e_key0.port = vnet_buffer (b0)->ip.reass.l4_dst_port;
823 e_key0.protocol = proto0;
824 e_key0.fib_index = rx_fib_index0;
825 if (snat_static_mapping_match (sm, e_key0, &l_key0, 1, 0,
826 &twice_nat0, &lb_nat0,
831 * Send DHCP packets to the ipv4 stack, or we won't
832 * be able to use dhcp client on the outside interface
835 (proto0 == SNAT_PROTOCOL_UDP
836 && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
838 (UDP_DST_PORT_dhcp_to_client))))
843 if (!sm->forwarding_enabled)
846 node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
847 next0 = NAT_NEXT_DROP;
852 (sm, ip0, ip0->protocol,
853 vnet_buffer (b0)->ip.reass.l4_src_port,
854 vnet_buffer (b0)->ip.reass.l4_dst_port,
855 thread_index, rx_fib_index0))
857 next0 = NAT_NEXT_IN2OUT_ED_FAST_PATH;
860 if (sm->num_workers > 1)
861 create_bypass_for_fwd_worker (sm, b0, ip0,
864 create_bypass_for_fwd (sm, b0, ip0, rx_fib_index0,
870 if (PREDICT_FALSE (identity_nat0))
873 if ((proto0 == SNAT_PROTOCOL_TCP)
874 && !tcp_flags_is_init (vnet_buffer (b0)->ip.
875 reass.icmp_type_or_tcp_flags))
877 b0->error = node->errors[NAT_OUT2IN_ED_ERROR_NON_SYN];
878 next0 = NAT_NEXT_DROP;
882 /* Create session initiated by host from external network */
883 s0 = create_session_for_static_mapping_ed (sm, b0, l_key0,
891 next0 = NAT_NEXT_DROP;
897 next0 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
903 s0 = pool_elt_at_index (tsm->sessions, value0.value);
906 old_addr0 = ip0->dst_address.as_u32;
907 new_addr0 = ip0->dst_address.as_u32 = s0->in2out.addr.as_u32;
908 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
910 sum0 = ip0->checksum;
911 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
913 if (PREDICT_FALSE (is_twice_nat_session (s0)))
914 sum0 = ip_csum_update (sum0, ip0->src_address.as_u32,
915 s0->ext_host_nat_addr.as_u32, ip4_header_t,
917 ip0->checksum = ip_csum_fold (sum0);
919 old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port;
921 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
923 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
925 new_port0 = udp0->dst_port = s0->in2out.port;
926 sum0 = tcp0->checksum;
928 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
931 ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
933 if (is_twice_nat_session (s0))
935 sum0 = ip_csum_update (sum0, ip0->src_address.as_u32,
936 s0->ext_host_nat_addr.as_u32,
937 ip4_header_t, dst_address);
939 ip_csum_update (sum0,
940 vnet_buffer (b0)->ip.
942 s0->ext_host_nat_port, ip4_header_t,
944 tcp0->src_port = s0->ext_host_nat_port;
945 ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
947 tcp0->checksum = ip_csum_fold (sum0);
950 if (nat44_set_tcp_session_state_o2i
951 (sm, s0, vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags,
952 vnet_buffer (b0)->ip.reass.tcp_ack_number,
953 vnet_buffer (b0)->ip.reass.tcp_seq_number, thread_index))
956 else if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment
959 new_port0 = udp0->dst_port = s0->in2out.port;
960 sum0 = udp0->checksum;
961 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
963 sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
965 if (PREDICT_FALSE (is_twice_nat_session (s0)))
967 sum0 = ip_csum_update (sum0, ip0->src_address.as_u32,
968 s0->ext_host_nat_addr.as_u32,
969 ip4_header_t, dst_address);
971 ip_csum_update (sum0,
972 vnet_buffer (b0)->ip.reass.l4_src_port,
973 s0->ext_host_nat_port, ip4_header_t,
975 udp0->src_port = s0->ext_host_nat_port;
976 ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
978 udp0->checksum = ip_csum_fold (sum0);
983 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
985 new_port0 = udp0->dst_port = s0->in2out.port;
986 if (PREDICT_FALSE (is_twice_nat_session (s0)))
988 udp0->dst_port = s0->in2out.port;
989 if (is_twice_nat_session (s0))
991 udp0->src_port = s0->ext_host_nat_port;
992 ip0->src_address.as_u32 =
993 s0->ext_host_nat_addr.as_u32;
1002 nat44_session_update_counters (s0, now,
1003 vlib_buffer_length_in_chain (vm, b0),
1005 /* Per-user LRU list maintenance */
1006 nat44_session_update_lru (sm, s0, thread_index);
1009 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1010 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1012 nat44_ed_out2in_trace_t *t =
1013 vlib_add_trace (vm, node, b0, sizeof (*t));
1014 t->is_slow_path = is_slow_path;
1015 t->sw_if_index = sw_if_index0;
1016 t->next_index = next0;
1017 t->session_index = ~0;
1019 t->session_index = s0 - tsm->sessions;
1022 pkts_processed += next0 == nat_buffer_opaque (b0)->arc_next;
1024 vnet_buffer (b1)->snat.flags = 0;
1025 ip1 = vlib_buffer_get_current (b1);
1027 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
1029 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1032 if (PREDICT_FALSE (ip1->ttl == 1))
1034 vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1035 icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
1036 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1038 next1 = NAT_NEXT_ICMP_ERROR;
1042 udp1 = ip4_next_header (ip1);
1043 tcp1 = (tcp_header_t *) udp1;
1044 icmp1 = (icmp46_header_t *) udp1;
1045 proto1 = ip_proto_to_snat_proto (ip1->protocol);
1049 if (PREDICT_FALSE (proto1 == ~0))
1052 nat44_ed_out2in_unknown_proto (sm, b1, ip1, rx_fib_index1,
1053 thread_index, now, vm,
1056 if (!sm->forwarding_enabled)
1059 next1 = NAT_NEXT_DROP;
1064 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1066 next1 = icmp_out2in_ed_slow_path
1067 (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
1068 next1, now, thread_index, &s1);
1075 if (PREDICT_FALSE (proto1 == ~0))
1077 next1 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
1081 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1083 next1 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
1088 make_ed_kv (&kv1, &ip1->dst_address, &ip1->src_address,
1089 ip1->protocol, rx_fib_index1,
1090 vnet_buffer (b1)->ip.reass.l4_dst_port,
1091 vnet_buffer (b1)->ip.reass.l4_src_port);
1093 if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv1, &value1))
1097 /* Try to match static mapping by external address and port,
1098 destination address and port in packet */
1099 e_key1.addr = ip1->dst_address;
1100 e_key1.port = vnet_buffer (b1)->ip.reass.l4_dst_port;
1101 e_key1.protocol = proto1;
1102 e_key1.fib_index = rx_fib_index1;
1103 if (snat_static_mapping_match (sm, e_key1, &l_key1, 1, 0,
1104 &twice_nat1, &lb_nat1,
1109 * Send DHCP packets to the ipv4 stack, or we won't
1110 * be able to use dhcp client on the outside interface
1113 (proto1 == SNAT_PROTOCOL_UDP
1114 && (vnet_buffer (b1)->ip.reass.l4_dst_port ==
1115 clib_host_to_net_u16
1116 (UDP_DST_PORT_dhcp_to_client))))
1121 if (!sm->forwarding_enabled)
1124 node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
1125 next1 = NAT_NEXT_DROP;
1130 (sm, ip1, ip1->protocol,
1131 vnet_buffer (b1)->ip.reass.l4_src_port,
1132 vnet_buffer (b1)->ip.reass.l4_dst_port,
1133 thread_index, rx_fib_index1))
1135 next1 = NAT_NEXT_IN2OUT_ED_FAST_PATH;
1138 if (sm->num_workers > 1)
1139 create_bypass_for_fwd_worker (sm, b1, ip1,
1142 create_bypass_for_fwd (sm, b1, ip1, rx_fib_index1,
1148 if (PREDICT_FALSE (identity_nat1))
1151 if ((proto1 == SNAT_PROTOCOL_TCP)
1152 && !tcp_flags_is_init (vnet_buffer (b1)->ip.
1153 reass.icmp_type_or_tcp_flags))
1155 b1->error = node->errors[NAT_OUT2IN_ED_ERROR_NON_SYN];
1156 next1 = NAT_NEXT_DROP;
1160 /* Create session initiated by host from external network */
1161 s1 = create_session_for_static_mapping_ed (sm, b1, l_key1,
1169 next1 = NAT_NEXT_DROP;
1175 next1 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
1181 s1 = pool_elt_at_index (tsm->sessions, value1.value);
1184 old_addr1 = ip1->dst_address.as_u32;
1185 new_addr1 = ip1->dst_address.as_u32 = s1->in2out.addr.as_u32;
1186 vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->in2out.fib_index;
1188 sum1 = ip1->checksum;
1189 sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1191 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1192 sum1 = ip_csum_update (sum1, ip1->src_address.as_u32,
1193 s1->ext_host_nat_addr.as_u32, ip4_header_t,
1195 ip1->checksum = ip_csum_fold (sum1);
1197 old_port1 = vnet_buffer (b1)->ip.reass.l4_dst_port;
1199 if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1201 if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment)
1203 new_port1 = udp1->dst_port = s1->in2out.port;
1205 sum1 = tcp1->checksum;
1207 ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1210 ip_csum_update (sum1, old_port1, new_port1, ip4_header_t,
1212 if (is_twice_nat_session (s1))
1214 sum1 = ip_csum_update (sum1, ip1->src_address.as_u32,
1215 s1->ext_host_nat_addr.as_u32,
1216 ip4_header_t, dst_address);
1218 ip_csum_update (sum1,
1219 vnet_buffer (b1)->ip.
1221 s1->ext_host_nat_port, ip4_header_t,
1223 tcp1->src_port = s1->ext_host_nat_port;
1224 ip1->src_address.as_u32 = s1->ext_host_nat_addr.as_u32;
1226 tcp1->checksum = ip_csum_fold (sum1);
1229 if (nat44_set_tcp_session_state_o2i
1230 (sm, s1, vnet_buffer (b1)->ip.reass.icmp_type_or_tcp_flags,
1231 vnet_buffer (b1)->ip.reass.tcp_ack_number,
1232 vnet_buffer (b1)->ip.reass.tcp_seq_number, thread_index))
1235 else if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment
1238 new_port1 = udp1->dst_port = s1->in2out.port;
1239 sum1 = udp1->checksum;
1240 sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1242 sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t,
1244 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1246 sum1 = ip_csum_update (sum1, ip1->src_address.as_u32,
1247 s1->ext_host_nat_addr.as_u32,
1248 ip4_header_t, dst_address);
1250 ip_csum_update (sum1,
1251 vnet_buffer (b1)->ip.reass.l4_src_port,
1252 s1->ext_host_nat_port, ip4_header_t,
1254 udp1->src_port = s1->ext_host_nat_port;
1255 ip1->src_address.as_u32 = s1->ext_host_nat_addr.as_u32;
1257 udp1->checksum = ip_csum_fold (sum1);
1262 if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment)
1264 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1266 udp1->dst_port = s1->in2out.port;
1267 if (is_twice_nat_session (s1))
1269 udp1->src_port = s1->ext_host_nat_port;
1270 ip1->src_address.as_u32 =
1271 s1->ext_host_nat_addr.as_u32;
1280 nat44_session_update_counters (s1, now,
1281 vlib_buffer_length_in_chain (vm, b1),
1283 /* Per-user LRU list maintenance */
1284 nat44_session_update_lru (sm, s1, thread_index);
1287 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1288 && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1290 nat44_ed_out2in_trace_t *t =
1291 vlib_add_trace (vm, node, b1, sizeof (*t));
1292 t->is_slow_path = is_slow_path;
1293 t->sw_if_index = sw_if_index1;
1294 t->next_index = next1;
1295 t->session_index = ~0;
1297 t->session_index = s1 - tsm->sessions;
1300 pkts_processed += next1 == nat_buffer_opaque (b1)->arc_next;
1302 /* verify speculative enqueues, maybe switch current next frame */
1303 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1304 to_next, n_left_to_next,
1305 bi0, bi1, next0, next1);
1308 while (n_left_from > 0 && n_left_to_next > 0)
1312 u32 next0, sw_if_index0, rx_fib_index0, proto0, old_addr0,
1314 u16 old_port0, new_port0;
1318 icmp46_header_t *icmp0;
1319 snat_session_t *s0 = 0;
1320 clib_bihash_kv_16_8_t kv0, value0;
1322 snat_session_key_t e_key0, l_key0;
1323 lb_nat_type_t lb_nat0;
1324 twice_nat_type_t twice_nat0;
1327 /* speculatively enqueue b0 to the current next frame */
1333 n_left_to_next -= 1;
1335 b0 = vlib_get_buffer (vm, bi0);
1336 next0 = nat_buffer_opaque (b0)->arc_next;
1338 vnet_buffer (b0)->snat.flags = 0;
1339 ip0 = vlib_buffer_get_current (b0);
1341 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1343 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1346 if (PREDICT_FALSE (ip0->ttl == 1))
1348 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1349 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1350 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1352 next0 = NAT_NEXT_ICMP_ERROR;
1356 udp0 = ip4_next_header (ip0);
1357 tcp0 = (tcp_header_t *) udp0;
1358 icmp0 = (icmp46_header_t *) udp0;
1359 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1363 if (PREDICT_FALSE (proto0 == ~0))
1366 nat44_ed_out2in_unknown_proto (sm, b0, ip0, rx_fib_index0,
1367 thread_index, now, vm,
1370 if (!sm->forwarding_enabled)
1373 next0 = NAT_NEXT_DROP;
1378 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1380 next0 = icmp_out2in_ed_slow_path
1381 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1382 next0, now, thread_index, &s0);
1389 if (PREDICT_FALSE (proto0 == ~0))
1391 next0 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
1395 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1397 next0 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
1402 make_ed_kv (&kv0, &ip0->dst_address, &ip0->src_address,
1403 ip0->protocol, rx_fib_index0,
1404 vnet_buffer (b0)->ip.reass.l4_dst_port,
1405 vnet_buffer (b0)->ip.reass.l4_src_port);
1407 if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv0, &value0))
1411 /* Try to match static mapping by external address and port,
1412 destination address and port in packet */
1413 e_key0.addr = ip0->dst_address;
1414 e_key0.port = vnet_buffer (b0)->ip.reass.l4_dst_port;
1415 e_key0.protocol = proto0;
1416 e_key0.fib_index = rx_fib_index0;
1417 if (snat_static_mapping_match (sm, e_key0, &l_key0, 1, 0,
1418 &twice_nat0, &lb_nat0,
1423 * Send DHCP packets to the ipv4 stack, or we won't
1424 * be able to use dhcp client on the outside interface
1427 (proto0 == SNAT_PROTOCOL_UDP
1428 && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
1429 clib_host_to_net_u16
1430 (UDP_DST_PORT_dhcp_to_client))))
1435 if (!sm->forwarding_enabled)
1438 node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
1439 next0 = NAT_NEXT_DROP;
1444 (sm, ip0, ip0->protocol,
1445 vnet_buffer (b0)->ip.reass.l4_src_port,
1446 vnet_buffer (b0)->ip.reass.l4_dst_port,
1447 thread_index, rx_fib_index0))
1449 next0 = NAT_NEXT_IN2OUT_ED_FAST_PATH;
1452 if (sm->num_workers > 1)
1453 create_bypass_for_fwd_worker (sm, b0, ip0,
1456 create_bypass_for_fwd (sm, b0, ip0, rx_fib_index0,
1462 if (PREDICT_FALSE (identity_nat0))
1465 if ((proto0 == SNAT_PROTOCOL_TCP)
1466 && !tcp_flags_is_init (vnet_buffer (b0)->ip.
1467 reass.icmp_type_or_tcp_flags))
1469 b0->error = node->errors[NAT_OUT2IN_ED_ERROR_NON_SYN];
1470 next0 = NAT_NEXT_DROP;
1474 /* Create session initiated by host from external network */
1475 s0 = create_session_for_static_mapping_ed (sm, b0, l_key0,
1483 next0 = NAT_NEXT_DROP;
1489 next0 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
1495 s0 = pool_elt_at_index (tsm->sessions, value0.value);
1498 old_addr0 = ip0->dst_address.as_u32;
1499 new_addr0 = ip0->dst_address.as_u32 = s0->in2out.addr.as_u32;
1500 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
1502 sum0 = ip0->checksum;
1503 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1505 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1506 sum0 = ip_csum_update (sum0, ip0->src_address.as_u32,
1507 s0->ext_host_nat_addr.as_u32, ip4_header_t,
1509 ip0->checksum = ip_csum_fold (sum0);
1511 old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port;
1513 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1515 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1517 new_port0 = udp0->dst_port = s0->in2out.port;
1518 sum0 = tcp0->checksum;
1520 ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1523 ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1525 if (is_twice_nat_session (s0))
1527 sum0 = ip_csum_update (sum0, ip0->src_address.as_u32,
1528 s0->ext_host_nat_addr.as_u32,
1529 ip4_header_t, dst_address);
1531 ip_csum_update (sum0,
1532 vnet_buffer (b0)->ip.
1534 s0->ext_host_nat_port, ip4_header_t,
1536 tcp0->src_port = s0->ext_host_nat_port;
1537 ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
1539 tcp0->checksum = ip_csum_fold (sum0);
1542 if (nat44_set_tcp_session_state_o2i
1543 (sm, s0, vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags,
1544 vnet_buffer (b0)->ip.reass.tcp_ack_number,
1545 vnet_buffer (b0)->ip.reass.tcp_seq_number, thread_index))
1548 else if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment
1551 new_port0 = udp0->dst_port = s0->in2out.port;
1552 sum0 = udp0->checksum;
1553 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1555 sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1557 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1559 sum0 = ip_csum_update (sum0, ip0->src_address.as_u32,
1560 s0->ext_host_nat_addr.as_u32,
1561 ip4_header_t, dst_address);
1563 ip_csum_update (sum0,
1564 vnet_buffer (b0)->ip.reass.l4_src_port,
1565 s0->ext_host_nat_port, ip4_header_t,
1567 udp0->src_port = s0->ext_host_nat_port;
1568 ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
1570 udp0->checksum = ip_csum_fold (sum0);
1575 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1577 new_port0 = udp0->dst_port = s0->in2out.port;
1578 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1580 udp0->src_port = s0->ext_host_nat_port;
1581 ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32;
1588 nat44_session_update_counters (s0, now,
1589 vlib_buffer_length_in_chain (vm, b0),
1591 /* Per-user LRU list maintenance */
1592 nat44_session_update_lru (sm, s0, thread_index);
1595 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1596 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1598 nat44_ed_out2in_trace_t *t =
1599 vlib_add_trace (vm, node, b0, sizeof (*t));
1600 t->is_slow_path = is_slow_path;
1601 t->sw_if_index = sw_if_index0;
1602 t->next_index = next0;
1603 t->session_index = ~0;
1605 t->session_index = s0 - tsm->sessions;
1608 pkts_processed += next0 == nat_buffer_opaque (b0)->arc_next;
1609 /* verify speculative enqueue, maybe switch current next frame */
1610 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1611 to_next, n_left_to_next,
1615 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1618 vlib_node_increment_counter (vm, stats_node_index,
1619 NAT_OUT2IN_ED_ERROR_OUT2IN_PACKETS,
1621 vlib_node_increment_counter (vm, stats_node_index,
1622 NAT_OUT2IN_ED_ERROR_TCP_PACKETS, tcp_packets);
1623 vlib_node_increment_counter (vm, stats_node_index,
1624 NAT_OUT2IN_ED_ERROR_UDP_PACKETS, udp_packets);
1625 vlib_node_increment_counter (vm, stats_node_index,
1626 NAT_OUT2IN_ED_ERROR_ICMP_PACKETS,
1628 vlib_node_increment_counter (vm, stats_node_index,
1629 NAT_OUT2IN_ED_ERROR_OTHER_PACKETS,
1631 vlib_node_increment_counter (vm, stats_node_index,
1632 NAT_OUT2IN_ED_ERROR_FRAGMENTS, fragments);
1633 return frame->n_vectors;
1636 VLIB_NODE_FN (nat44_ed_out2in_node) (vlib_main_t * vm,
1637 vlib_node_runtime_t * node,
1638 vlib_frame_t * frame)
1640 return nat44_ed_out2in_node_fn_inline (vm, node, frame, 0);
1644 VLIB_REGISTER_NODE (nat44_ed_out2in_node) = {
1645 .name = "nat44-ed-out2in",
1646 .vector_size = sizeof (u32),
1647 .sibling_of = "nat-default",
1648 .format_trace = format_nat44_ed_out2in_trace,
1649 .type = VLIB_NODE_TYPE_INTERNAL,
1650 .n_errors = ARRAY_LEN(nat_out2in_ed_error_strings),
1651 .error_strings = nat_out2in_ed_error_strings,
1652 .runtime_data_bytes = sizeof (snat_runtime_t),
1656 VLIB_NODE_FN (nat44_ed_out2in_slowpath_node) (vlib_main_t * vm,
1657 vlib_node_runtime_t * node,
1658 vlib_frame_t * frame)
1660 return nat44_ed_out2in_node_fn_inline (vm, node, frame, 1);
1664 VLIB_REGISTER_NODE (nat44_ed_out2in_slowpath_node) = {
1665 .name = "nat44-ed-out2in-slowpath",
1666 .vector_size = sizeof (u32),
1667 .sibling_of = "nat-default",
1668 .format_trace = format_nat44_ed_out2in_trace,
1669 .type = VLIB_NODE_TYPE_INTERNAL,
1670 .n_errors = ARRAY_LEN(nat_out2in_ed_error_strings),
1671 .error_strings = nat_out2in_ed_error_strings,
1672 .runtime_data_bytes = sizeof (snat_runtime_t),
1677 format_nat_pre_trace (u8 * s, va_list * args)
1679 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1680 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1681 nat_pre_trace_t *t = va_arg (*args, nat_pre_trace_t *);
1682 return format (s, "out2in next_index %d", t->next_index);
1685 VLIB_NODE_FN (nat_pre_out2in_node) (vlib_main_t * vm,
1686 vlib_node_runtime_t * node,
1687 vlib_frame_t * frame)
1689 return nat_pre_node_fn_inline (vm, node, frame,
1690 NAT_NEXT_OUT2IN_ED_FAST_PATH);
1694 VLIB_REGISTER_NODE (nat_pre_out2in_node) = {
1695 .name = "nat-pre-out2in",
1696 .vector_size = sizeof (u32),
1697 .sibling_of = "nat-default",
1698 .format_trace = format_nat_pre_trace,
1699 .type = VLIB_NODE_TYPE_INTERNAL,
1705 * fd.io coding-style-patch-verification: ON
1708 * eval: (c-set-style "gnu")