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/pg/pg.h>
23 #include <vnet/ip/ip.h>
24 #include <vnet/ethernet/ethernet.h>
25 #include <vnet/fib/ip4_fib.h>
26 #include <vppinfra/error.h>
28 #include <nat/nat_ipfix_logging.h>
29 #include <nat/nat_reass.h>
30 #include <nat/nat_inlines.h>
32 #define foreach_nat_in2out_ed_error \
33 _(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
34 _(IN2OUT_PACKETS, "Good in2out packets processed") \
35 _(OUT_OF_PORTS, "Out of ports") \
36 _(BAD_ICMP_TYPE, "unsupported ICMP type") \
37 _(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded") \
38 _(DROP_FRAGMENT, "Drop fragment") \
39 _(MAX_REASS, "Maximum reassemblies exceeded") \
40 _(MAX_FRAG, "Maximum fragments per reassembly exceeded")\
41 _(NON_SYN, "non-SYN packet try to create session")
45 #define _(sym,str) NAT_IN2OUT_ED_ERROR_##sym,
46 foreach_nat_in2out_ed_error
48 NAT_IN2OUT_ED_N_ERROR,
49 } nat_in2out_ed_error_t;
51 static char *nat_in2out_ed_error_strings[] = {
52 #define _(sym,string) string,
53 foreach_nat_in2out_ed_error
59 NAT_IN2OUT_ED_NEXT_LOOKUP,
60 NAT_IN2OUT_ED_NEXT_DROP,
61 NAT_IN2OUT_ED_NEXT_ICMP_ERROR,
62 NAT_IN2OUT_ED_NEXT_SLOW_PATH,
63 NAT_IN2OUT_ED_NEXT_REASS,
65 } nat_in2out_ed_next_t;
73 } nat_in2out_ed_trace_t;
75 vlib_node_registration_t nat44_ed_in2out_node;
76 vlib_node_registration_t nat44_ed_in2out_slowpath_node;
77 vlib_node_registration_t nat44_ed_in2out_output_node;
78 vlib_node_registration_t nat44_ed_in2out_output_slowpath_node;
79 vlib_node_registration_t nat44_ed_in2out_reass_node;
82 format_nat_in2out_ed_trace (u8 * s, va_list * args)
84 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
85 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
86 nat_in2out_ed_trace_t *t = va_arg (*args, nat_in2out_ed_trace_t *);
90 t->is_slow_path ? "NAT44_IN2OUT_ED_SLOW_PATH" :
91 "NAT44_IN2OUT_ED_FAST_PATH";
93 s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
94 t->sw_if_index, t->next_index, t->session_index);
99 static_always_inline int
100 icmp_get_ed_key (ip4_header_t * ip0, nat_ed_ses_key_t * p_key0)
102 icmp46_header_t *icmp0;
103 nat_ed_ses_key_t key0;
104 icmp_echo_header_t *echo0, *inner_echo0 = 0;
105 ip4_header_t *inner_ip0 = 0;
107 icmp46_header_t *inner_icmp0;
109 icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
110 echo0 = (icmp_echo_header_t *) (icmp0 + 1);
112 if (!icmp_is_error_message (icmp0))
114 key0.proto = IP_PROTOCOL_ICMP;
115 key0.l_addr = ip0->src_address;
116 key0.r_addr = ip0->dst_address;
117 key0.l_port = echo0->identifier;
122 inner_ip0 = (ip4_header_t *) (echo0 + 1);
123 l4_header = ip4_next_header (inner_ip0);
124 key0.proto = inner_ip0->protocol;
125 key0.r_addr = inner_ip0->src_address;
126 key0.l_addr = inner_ip0->dst_address;
127 switch (ip_proto_to_snat_proto (inner_ip0->protocol))
129 case SNAT_PROTOCOL_ICMP:
130 inner_icmp0 = (icmp46_header_t *) l4_header;
131 inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
133 key0.l_port = inner_echo0->identifier;
135 case SNAT_PROTOCOL_UDP:
136 case SNAT_PROTOCOL_TCP:
137 key0.l_port = ((tcp_udp_header_t *) l4_header)->dst_port;
138 key0.r_port = ((tcp_udp_header_t *) l4_header)->src_port;
141 return NAT_IN2OUT_ED_ERROR_UNSUPPORTED_PROTOCOL;
149 nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
151 snat_main_t *sm = &snat_main;
152 nat44_is_idle_session_ctx_t *ctx = arg;
154 u64 sess_timeout_time;
155 nat_ed_ses_key_t ed_key;
156 clib_bihash_kv_16_8_t ed_kv;
159 snat_session_key_t key;
160 snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
163 s = pool_elt_at_index (tsm->sessions, kv->value);
164 sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
165 if (ctx->now >= sess_timeout_time)
167 if (is_fwd_bypass_session (s))
170 ed_key.l_addr = s->out2in.addr;
171 ed_key.r_addr = s->ext_host_addr;
172 ed_key.fib_index = s->out2in.fib_index;
173 if (snat_is_unk_proto_session (s))
175 ed_key.proto = s->in2out.port;
181 ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol);
182 ed_key.l_port = s->out2in.port;
183 ed_key.r_port = s->ext_host_port;
185 ed_kv.key[0] = ed_key.as_u64[0];
186 ed_kv.key[1] = ed_key.as_u64[1];
187 if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &ed_kv, 0))
188 nat_log_warn ("out2in_ed key del failed");
190 if (snat_is_unk_proto_session (s))
193 snat_ipfix_logging_nat44_ses_delete (s->in2out.addr.as_u32,
194 s->out2in.addr.as_u32,
198 s->in2out.fib_index);
200 if (is_twice_nat_session (s))
202 for (i = 0; i < vec_len (sm->twice_nat_addresses); i++)
204 key.protocol = s->in2out.protocol;
205 key.port = s->ext_host_nat_port;
206 a = sm->twice_nat_addresses + i;
207 if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
209 snat_free_outside_address_and_port (sm->twice_nat_addresses,
217 if (snat_is_session_static (s))
220 snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
223 nat44_delete_session (sm, s, ctx->thread_index);
231 icmp_in2out_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
232 ip4_header_t * ip0, icmp46_header_t * icmp0,
233 u32 sw_if_index0, u32 rx_fib_index0,
234 vlib_node_runtime_t * node, u32 next0, f64 now,
235 u32 thread_index, snat_session_t ** p_s0)
237 next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
238 next0, thread_index, p_s0, 0);
239 snat_session_t *s0 = *p_s0;
240 if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP && s0))
243 nat44_session_update_counters (s0, now,
244 vlib_buffer_length_in_chain
245 (sm->vlib_main, b0));
246 /* Per-user LRU list maintenance */
247 nat44_session_update_lru (sm, s0, thread_index);
253 slow_path_ed (snat_main_t * sm,
256 clib_bihash_kv_16_8_t * kv,
257 snat_session_t ** sessionp,
258 vlib_node_runtime_t * node, u32 next, u32 thread_index, f64 now,
261 snat_session_t *s = 0;
263 snat_session_key_t key0, key1;
264 lb_nat_type_t lb = 0, is_sm = 0;
265 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
266 nat_ed_ses_key_t *key = (nat_ed_ses_key_t *) kv->key;
267 u32 proto = ip_proto_to_snat_proto (key->proto);
268 nat_outside_fib_t *outside_fib;
269 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
272 .fp_proto = FIB_PROTOCOL_IP4,
275 .ip4.as_u32 = key->r_addr.as_u32,
278 nat44_is_idle_session_ctx_t ctx;
280 if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
282 b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
283 nat_ipfix_logging_max_sessions (sm->max_translations);
284 nat_log_notice ("maximum sessions exceeded");
285 return NAT_IN2OUT_ED_NEXT_DROP;
288 key0.addr = key->l_addr;
289 key0.port = key->l_port;
290 key1.protocol = key0.protocol = proto;
291 key0.fib_index = rx_fib_index;
292 key1.fib_index = sm->outside_fib_index;
293 /* First try to match static mapping by local address and port */
294 if (snat_static_mapping_match
295 (sm, key0, &key1, 0, 0, 0, &lb, 0, &identity_nat))
297 /* Try to create dynamic translation */
298 if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index,
301 tsm->snat_thread_index))
303 nat_log_notice ("addresses exhausted");
304 b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS];
305 return NAT_IN2OUT_ED_NEXT_DROP;
310 if (PREDICT_FALSE (identity_nat))
319 if (proto == SNAT_PROTOCOL_TCP)
321 if (!tcp_is_init (tcp))
323 b->error = node->errors[NAT_IN2OUT_ED_ERROR_NON_SYN];
324 return NAT_IN2OUT_ED_NEXT_DROP;
328 u = nat_user_get_or_create (sm, &key->l_addr, rx_fib_index, thread_index);
331 nat_log_warn ("create NAT user failed");
333 snat_free_outside_address_and_port (sm->addresses,
334 thread_index, &key1);
335 return NAT_IN2OUT_ED_NEXT_DROP;
338 s = nat_ed_session_alloc (sm, u, thread_index, now);
341 nat44_delete_user_with_no_session (sm, u, thread_index);
342 nat_log_warn ("create NAT session failed");
344 snat_free_outside_address_and_port (sm->addresses,
345 thread_index, &key1);
346 return NAT_IN2OUT_ED_NEXT_DROP;
349 user_session_increment (sm, u, is_sm);
351 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
353 s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
354 s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
355 s->ext_host_addr = key->r_addr;
356 s->ext_host_port = key->r_port;
359 s->out2in.protocol = key0.protocol;
361 switch (vec_len (sm->outside_fibs))
364 s->out2in.fib_index = sm->outside_fib_index;
367 s->out2in.fib_index = sm->outside_fibs[0].fib_index;
371 vec_foreach (outside_fib, sm->outside_fibs)
373 fei = fib_table_lookup (outside_fib->fib_index, &pfx);
374 if (FIB_NODE_INDEX_INVALID != fei)
376 if (fib_entry_get_resolving_interface (fei) != ~0)
378 s->out2in.fib_index = outside_fib->fib_index;
387 /* Add to lookup tables */
388 kv->value = s - tsm->sessions;
390 ctx.thread_index = thread_index;
391 if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, kv,
392 nat44_i2o_ed_is_idle_session_cb,
394 nat_log_notice ("in2out-ed key add failed");
396 make_ed_kv (kv, &key1.addr, &key->r_addr, key->proto, s->out2in.fib_index,
397 key1.port, key->r_port);
398 kv->value = s - tsm->sessions;
399 if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, kv,
400 nat44_o2i_ed_is_idle_session_cb,
402 nat_log_notice ("out2in-ed key add failed");
407 snat_ipfix_logging_nat44_ses_create (s->in2out.addr.as_u32,
408 s->out2in.addr.as_u32,
411 s->out2in.port, s->in2out.fib_index);
415 static_always_inline int
416 nat44_ed_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
417 u32 sw_if_index, ip4_header_t * ip, u32 proto,
418 u32 rx_fib_index, u32 thread_index)
420 udp_header_t *udp = ip4_next_header (ip);
421 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
422 clib_bihash_kv_16_8_t kv, value;
423 snat_session_key_t key0, key1;
425 make_ed_kv (&kv, &ip->dst_address, &ip->src_address, ip->protocol,
426 sm->outside_fib_index, udp->dst_port, udp->src_port);
428 /* NAT packet aimed at external address if */
429 /* has active sessions */
430 if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
432 key0.addr = ip->dst_address;
433 key0.port = udp->dst_port;
434 key0.protocol = proto;
435 key0.fib_index = sm->outside_fib_index;
436 /* or is static mappings */
437 if (!snat_static_mapping_match (sm, key0, &key1, 1, 0, 0, 0, 0, 0))
443 if (sm->forwarding_enabled)
446 return snat_not_translate_fast (sm, node, sw_if_index, ip, proto,
450 static_always_inline int
451 nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip,
452 u32 thread_index, f64 now,
453 vlib_main_t * vm, vlib_buffer_t * b)
455 nat_ed_ses_key_t key;
456 clib_bihash_kv_16_8_t kv, value;
458 snat_session_t *s = 0;
459 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
461 if (!sm->forwarding_enabled)
464 if (ip->protocol == IP_PROTOCOL_ICMP)
466 key.as_u64[0] = key.as_u64[1] = 0;
467 if (icmp_get_ed_key (ip, &key))
470 kv.key[0] = key.as_u64[0];
471 kv.key[1] = key.as_u64[1];
473 else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
475 udp = ip4_next_header (ip);
476 make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0,
477 udp->src_port, udp->dst_port);
481 make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0, 0,
485 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
487 s = pool_elt_at_index (tsm->sessions, value.value);
488 if (is_fwd_bypass_session (s))
490 if (ip->protocol == IP_PROTOCOL_TCP)
492 tcp_header_t *tcp = ip4_next_header (ip);
493 if (nat44_set_tcp_session_state_i2o (sm, s, tcp, thread_index))
497 nat44_session_update_counters (s, now,
498 vlib_buffer_length_in_chain (vm, b));
499 /* Per-user LRU list maintenance */
500 nat44_session_update_lru (sm, s, thread_index);
510 static_always_inline int
511 nat44_ed_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip,
512 u8 proto, u16 src_port, u16 dst_port,
513 u32 thread_index, u32 rx_sw_if_index,
516 clib_bihash_kv_16_8_t kv, value;
517 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
520 u32 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (rx_sw_if_index);
521 u32 tx_fib_index = ip4_fib_table_get_index_for_sw_if_index (tx_sw_if_index);
524 make_ed_kv (&kv, &ip->src_address, &ip->dst_address, proto, tx_fib_index,
526 if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
528 s = pool_elt_at_index (tsm->sessions, value.value);
529 if (nat44_is_ses_closed (s))
531 nat_log_debug ("TCP close connection %U", format_snat_session,
532 &sm->per_thread_data[thread_index], s);
533 nat_free_session_data (sm, s, thread_index);
534 nat44_delete_session (sm, s, thread_index);
537 s->flags |= SNAT_SESSION_FLAG_OUTPUT_FEATURE;
542 make_ed_kv (&kv, &ip->dst_address, &ip->src_address, proto, rx_fib_index,
544 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
546 s = pool_elt_at_index (tsm->sessions, value.value);
547 if (is_fwd_bypass_session (s))
552 pool_foreach (i, sm->output_feature_interfaces,
554 if ((nat_interface_is_inside (i)) && (rx_sw_if_index == i->sw_if_index))
565 icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node,
566 u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip,
567 u8 * p_proto, snat_session_key_t * p_value,
568 u8 * p_dont_translate, void *d, void *e)
570 icmp46_header_t *icmp;
573 nat_ed_ses_key_t key;
574 snat_session_t *s = 0;
575 u8 dont_translate = 0;
576 clib_bihash_kv_16_8_t kv, value;
579 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
581 icmp = (icmp46_header_t *) ip4_next_header (ip);
582 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
583 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
585 key.as_u64[0] = key.as_u64[1] = 0;
586 err = icmp_get_ed_key (ip, &key);
589 b->error = node->errors[err];
590 next = NAT_IN2OUT_ED_NEXT_DROP;
593 key.fib_index = rx_fib_index;
595 kv.key[0] = key.as_u64[0];
596 kv.key[1] = key.as_u64[1];
598 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
600 if (vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0)
602 if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (sm, ip,
621 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index,
622 ip, SNAT_PROTOCOL_ICMP,
631 if (PREDICT_FALSE (icmp_is_error_message (icmp)))
633 b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
634 next = NAT_IN2OUT_ED_NEXT_DROP;
638 next = slow_path_ed (sm, b, rx_fib_index, &kv, &s, node, next,
639 thread_index, vlib_time_now (sm->vlib_main), 0);
641 if (PREDICT_FALSE (next == NAT_IN2OUT_ED_NEXT_DROP))
652 if (PREDICT_FALSE (icmp->type != ICMP4_echo_request &&
653 icmp->type != ICMP4_echo_reply &&
654 !icmp_is_error_message (icmp)))
656 b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
657 next = NAT_IN2OUT_ED_NEXT_DROP;
661 s = pool_elt_at_index (tsm->sessions, value.value);
664 *p_proto = ip_proto_to_snat_proto (key.proto);
667 *p_value = s->out2in;
668 *p_dont_translate = dont_translate;
670 *(snat_session_t **) d = s;
674 static snat_session_t *
675 nat44_ed_in2out_unknown_proto (snat_main_t * sm,
681 vlib_main_t * vm, vlib_node_runtime_t * node)
683 clib_bihash_kv_8_8_t kv, value;
684 clib_bihash_kv_16_8_t s_kv, s_value;
685 snat_static_mapping_t *m;
686 u32 old_addr, new_addr = 0;
689 dlist_elt_t *head, *elt;
690 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
691 u32 elt_index, head_index, ses_index;
693 u32 outside_fib_index = sm->outside_fib_index;
696 nat_outside_fib_t *outside_fib;
697 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
699 .fp_proto = FIB_PROTOCOL_IP4,
702 .ip4.as_u32 = ip->dst_address.as_u32,
706 switch (vec_len (sm->outside_fibs))
709 outside_fib_index = sm->outside_fib_index;
712 outside_fib_index = sm->outside_fibs[0].fib_index;
716 vec_foreach (outside_fib, sm->outside_fibs)
718 fei = fib_table_lookup (outside_fib->fib_index, &pfx);
719 if (FIB_NODE_INDEX_INVALID != fei)
721 if (fib_entry_get_resolving_interface (fei) != ~0)
723 outside_fib_index = outside_fib->fib_index;
731 old_addr = ip->src_address.as_u32;
733 make_ed_kv (&s_kv, &ip->src_address, &ip->dst_address, ip->protocol,
736 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &s_kv, &s_value))
738 s = pool_elt_at_index (tsm->sessions, s_value.value);
739 new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
743 if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
745 b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
746 nat_ipfix_logging_max_sessions (sm->max_translations);
747 nat_log_notice ("maximum sessions exceeded");
751 u = nat_user_get_or_create (sm, &ip->src_address, rx_fib_index,
755 nat_log_warn ("create NAT user failed");
759 make_sm_kv (&kv, &ip->src_address, 0, rx_fib_index, 0);
761 /* Try to find static mapping first */
762 if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
764 m = pool_elt_at_index (sm->static_mappings, value.value);
765 new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
769 /* Fallback to 3-tuple key */
772 /* Choose same out address as for TCP/UDP session to same destination */
773 head_index = u->sessions_per_user_list_head_index;
774 head = pool_elt_at_index (tsm->list_pool, head_index);
775 elt_index = head->next;
776 if (PREDICT_FALSE (elt_index == ~0))
780 elt = pool_elt_at_index (tsm->list_pool, elt_index);
781 ses_index = elt->value;
784 while (ses_index != ~0)
786 s = pool_elt_at_index (tsm->sessions, ses_index);
787 elt_index = elt->next;
788 elt = pool_elt_at_index (tsm->list_pool, elt_index);
789 ses_index = elt->value;
791 if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
793 new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
795 make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address,
796 ip->protocol, outside_fib_index, 0, 0);
797 if (clib_bihash_search_16_8
798 (&tsm->out2in_ed, &s_kv, &s_value))
805 for (i = 0; i < vec_len (sm->addresses); i++)
807 make_ed_kv (&s_kv, &sm->addresses[i].addr, &ip->dst_address,
808 ip->protocol, outside_fib_index, 0, 0);
809 if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
811 new_addr = ip->src_address.as_u32 =
812 sm->addresses[i].addr.as_u32;
820 s = nat_ed_session_alloc (sm, u, thread_index, now);
823 nat44_delete_user_with_no_session (sm, u, thread_index);
824 nat_log_warn ("create NAT session failed");
828 s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
829 s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
830 s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
831 s->out2in.addr.as_u32 = new_addr;
832 s->out2in.fib_index = outside_fib_index;
833 s->in2out.addr.as_u32 = old_addr;
834 s->in2out.fib_index = rx_fib_index;
835 s->in2out.port = s->out2in.port = ip->protocol;
837 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
838 user_session_increment (sm, u, is_sm);
840 /* Add to lookup tables */
841 make_ed_kv (&s_kv, &s->in2out.addr, &ip->dst_address, ip->protocol,
843 s_kv.value = s - tsm->sessions;
844 if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1))
845 nat_log_notice ("in2out key add failed");
847 make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address, ip->protocol,
848 outside_fib_index, 0, 0);
849 s_kv.value = s - tsm->sessions;
850 if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1))
851 nat_log_notice ("out2in key add failed");
854 /* Update IP checksum */
856 sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
857 ip->checksum = ip_csum_fold (sum);
860 nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b));
861 /* Per-user LRU list maintenance */
862 nat44_session_update_lru (sm, s, thread_index);
865 if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
866 nat44_ed_hairpinning_unknown_proto (sm, b, ip);
868 if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
869 vnet_buffer (b)->sw_if_index[VLIB_TX] = outside_fib_index;
875 nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
876 vlib_node_runtime_t * node,
877 vlib_frame_t * frame, int is_slow_path,
878 int is_output_feature)
880 u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
881 nat_in2out_ed_next_t next_index;
882 snat_main_t *sm = &snat_main;
883 f64 now = vlib_time_now (vm);
884 u32 thread_index = vm->thread_index;
885 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
887 stats_node_index = is_slow_path ? nat44_ed_in2out_slowpath_node.index :
888 nat44_ed_in2out_node.index;
890 from = vlib_frame_vector_args (frame);
891 n_left_from = frame->n_vectors;
892 next_index = node->cached_next_index;
894 while (n_left_from > 0)
898 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
900 while (n_left_from >= 4 && n_left_to_next >= 2)
903 vlib_buffer_t *b0, *b1;
904 u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
905 new_addr0, old_addr0;
906 u32 next1, sw_if_index1, rx_fib_index1, iph_offset1 = 0, proto1,
907 new_addr1, old_addr1;
908 u16 old_port0, new_port0, old_port1, new_port1;
909 ip4_header_t *ip0, *ip1;
910 udp_header_t *udp0, *udp1;
911 tcp_header_t *tcp0, *tcp1;
912 icmp46_header_t *icmp0, *icmp1;
913 snat_session_t *s0 = 0, *s1 = 0;
914 clib_bihash_kv_16_8_t kv0, value0, kv1, value1;
915 ip_csum_t sum0, sum1;
917 /* Prefetch next iteration. */
919 vlib_buffer_t *p2, *p3;
921 p2 = vlib_get_buffer (vm, from[2]);
922 p3 = vlib_get_buffer (vm, from[3]);
924 vlib_prefetch_buffer_header (p2, LOAD);
925 vlib_prefetch_buffer_header (p3, LOAD);
927 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
928 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
931 /* speculatively enqueue b0 and b1 to the current next frame */
932 to_next[0] = bi0 = from[0];
933 to_next[1] = bi1 = from[1];
939 b0 = vlib_get_buffer (vm, bi0);
940 b1 = vlib_get_buffer (vm, bi1);
942 next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
944 if (is_output_feature)
945 iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
947 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
950 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
952 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
955 if (PREDICT_FALSE (ip0->ttl == 1))
957 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
958 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
959 ICMP4_time_exceeded_ttl_exceeded_in_transit,
961 next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
965 udp0 = ip4_next_header (ip0);
966 tcp0 = (tcp_header_t *) udp0;
967 icmp0 = (icmp46_header_t *) udp0;
968 proto0 = ip_proto_to_snat_proto (ip0->protocol);
972 if (PREDICT_FALSE (proto0 == ~0))
974 s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
976 thread_index, now, vm,
979 next0 = NAT_IN2OUT_ED_NEXT_DROP;
983 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
985 next0 = icmp_in2out_ed_slow_path
986 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
987 next0, now, thread_index, &s0);
993 if (PREDICT_FALSE (proto0 == ~0))
995 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
999 if (ip4_is_fragment (ip0))
1001 next0 = NAT_IN2OUT_ED_NEXT_REASS;
1005 if (is_output_feature)
1008 (nat_not_translate_output_feature_fwd
1009 (sm, ip0, thread_index, now, vm, b0)))
1013 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1015 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1020 make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1021 ip0->protocol, rx_fib_index0, udp0->src_port,
1024 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1028 if (is_output_feature)
1031 (nat44_ed_not_translate_output_feature
1032 (sm, ip0, ip0->protocol, udp0->src_port,
1033 udp0->dst_port, thread_index, sw_if_index0,
1034 vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1039 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1048 slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1049 next0, thread_index, now, tcp0);
1051 if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1054 if (PREDICT_FALSE (!s0))
1059 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1065 s0 = pool_elt_at_index (tsm->sessions, value0.value);
1068 b0->flags |= VNET_BUFFER_F_IS_NATED;
1070 if (!is_output_feature)
1071 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1073 old_addr0 = ip0->src_address.as_u32;
1074 new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1075 sum0 = ip0->checksum;
1076 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1078 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1079 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1080 s0->ext_host_addr.as_u32, ip4_header_t,
1082 ip0->checksum = ip_csum_fold (sum0);
1084 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1086 old_port0 = tcp0->src_port;
1087 new_port0 = tcp0->src_port = s0->out2in.port;
1089 sum0 = tcp0->checksum;
1090 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1092 sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1094 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1096 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1097 s0->ext_host_addr.as_u32,
1098 ip4_header_t, dst_address);
1099 sum0 = ip_csum_update (sum0, tcp0->dst_port,
1100 s0->ext_host_port, ip4_header_t,
1102 tcp0->dst_port = s0->ext_host_port;
1103 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1105 mss_clamping (sm, tcp0, &sum0);
1106 tcp0->checksum = ip_csum_fold (sum0);
1107 if (nat44_set_tcp_session_state_i2o
1108 (sm, s0, tcp0, thread_index))
1113 udp0->src_port = s0->out2in.port;
1115 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1117 udp0->dst_port = s0->ext_host_port;
1118 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1123 nat44_session_update_counters (s0, now,
1124 vlib_buffer_length_in_chain (vm,
1126 /* Per-user LRU list maintenance */
1127 nat44_session_update_lru (sm, s0, thread_index);
1130 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1131 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1133 nat_in2out_ed_trace_t *t =
1134 vlib_add_trace (vm, node, b0, sizeof (*t));
1135 t->is_slow_path = is_slow_path;
1136 t->sw_if_index = sw_if_index0;
1137 t->next_index = next0;
1138 t->session_index = ~0;
1140 t->session_index = s0 - tsm->sessions;
1143 pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP;
1146 next1 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1148 if (is_output_feature)
1149 iph_offset1 = vnet_buffer (b1)->ip.save_rewrite_length;
1151 ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
1154 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
1156 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1159 if (PREDICT_FALSE (ip1->ttl == 1))
1161 vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1162 icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
1163 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1165 next1 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
1169 udp1 = ip4_next_header (ip1);
1170 tcp1 = (tcp_header_t *) udp1;
1171 icmp1 = (icmp46_header_t *) udp1;
1172 proto1 = ip_proto_to_snat_proto (ip1->protocol);
1176 if (PREDICT_FALSE (proto1 == ~0))
1178 s1 = nat44_ed_in2out_unknown_proto (sm, b1, ip1,
1180 thread_index, now, vm,
1183 next1 = NAT_IN2OUT_ED_NEXT_DROP;
1187 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1189 next1 = icmp_in2out_ed_slow_path
1190 (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
1191 next1, now, thread_index, &s1);
1197 if (PREDICT_FALSE (proto1 == ~0))
1199 next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1203 if (ip4_is_fragment (ip1))
1205 next1 = NAT_IN2OUT_ED_NEXT_REASS;
1209 if (is_output_feature)
1212 (nat_not_translate_output_feature_fwd
1213 (sm, ip1, thread_index, now, vm, b1)))
1217 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1219 next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1224 make_ed_kv (&kv1, &ip1->src_address, &ip1->dst_address,
1225 ip1->protocol, rx_fib_index1, udp1->src_port,
1228 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv1, &value1))
1232 if (is_output_feature)
1235 (nat44_ed_not_translate_output_feature
1236 (sm, ip1, ip1->protocol, udp1->src_port,
1237 udp1->dst_port, thread_index, sw_if_index1,
1238 vnet_buffer (b1)->sw_if_index[VLIB_TX])))
1243 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1252 slow_path_ed (sm, b1, rx_fib_index1, &kv1, &s1, node,
1253 next1, thread_index, now, tcp1);
1255 if (PREDICT_FALSE (next1 == NAT_IN2OUT_ED_NEXT_DROP))
1258 if (PREDICT_FALSE (!s1))
1263 next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1269 s1 = pool_elt_at_index (tsm->sessions, value1.value);
1272 b1->flags |= VNET_BUFFER_F_IS_NATED;
1274 if (!is_output_feature)
1275 vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
1277 old_addr1 = ip1->src_address.as_u32;
1278 new_addr1 = ip1->src_address.as_u32 = s1->out2in.addr.as_u32;
1279 sum1 = ip1->checksum;
1280 sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1282 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1283 sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1284 s1->ext_host_addr.as_u32, ip4_header_t,
1286 ip1->checksum = ip_csum_fold (sum1);
1288 if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1290 old_port1 = tcp1->src_port;
1291 new_port1 = tcp1->src_port = s1->out2in.port;
1293 sum1 = tcp1->checksum;
1294 sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1296 sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t,
1298 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1300 sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1301 s1->ext_host_addr.as_u32,
1302 ip4_header_t, dst_address);
1303 sum1 = ip_csum_update (sum1, tcp1->dst_port,
1304 s1->ext_host_port, ip4_header_t,
1306 tcp1->dst_port = s1->ext_host_port;
1307 ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1309 tcp1->checksum = ip_csum_fold (sum1);
1310 mss_clamping (sm, tcp1, &sum1);
1311 if (nat44_set_tcp_session_state_i2o
1312 (sm, s1, tcp1, thread_index))
1317 udp1->src_port = s1->out2in.port;
1319 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1321 udp1->dst_port = s1->ext_host_port;
1322 ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1327 nat44_session_update_counters (s1, now,
1328 vlib_buffer_length_in_chain (vm,
1330 /* Per-user LRU list maintenance */
1331 nat44_session_update_lru (sm, s1, thread_index);
1334 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1335 && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1337 nat_in2out_ed_trace_t *t =
1338 vlib_add_trace (vm, node, b1, sizeof (*t));
1339 t->is_slow_path = is_slow_path;
1340 t->sw_if_index = sw_if_index1;
1341 t->next_index = next1;
1342 t->session_index = ~0;
1344 t->session_index = s1 - tsm->sessions;
1347 pkts_processed += next1 != NAT_IN2OUT_ED_NEXT_DROP;
1349 /* verify speculative enqueues, maybe switch current next frame */
1350 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1351 to_next, n_left_to_next,
1352 bi0, bi1, next0, next1);
1355 while (n_left_from > 0 && n_left_to_next > 0)
1359 u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
1360 new_addr0, old_addr0;
1361 u16 old_port0, new_port0;
1365 icmp46_header_t *icmp0;
1366 snat_session_t *s0 = 0;
1367 clib_bihash_kv_16_8_t kv0, value0;
1370 /* speculatively enqueue b0 to the current next frame */
1376 n_left_to_next -= 1;
1378 b0 = vlib_get_buffer (vm, bi0);
1379 next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1381 if (is_output_feature)
1382 iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1384 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1387 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1389 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1392 if (PREDICT_FALSE (ip0->ttl == 1))
1394 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1395 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1396 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1398 next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
1402 udp0 = ip4_next_header (ip0);
1403 tcp0 = (tcp_header_t *) udp0;
1404 icmp0 = (icmp46_header_t *) udp0;
1405 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1409 if (PREDICT_FALSE (proto0 == ~0))
1411 s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
1413 thread_index, now, vm,
1416 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1420 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1422 next0 = icmp_in2out_ed_slow_path
1423 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1424 next0, now, thread_index, &s0);
1430 if (PREDICT_FALSE (proto0 == ~0))
1432 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1436 if (ip4_is_fragment (ip0))
1438 next0 = NAT_IN2OUT_ED_NEXT_REASS;
1442 if (is_output_feature)
1445 (nat_not_translate_output_feature_fwd
1446 (sm, ip0, thread_index, now, vm, b0)))
1450 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1452 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1457 make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1458 ip0->protocol, rx_fib_index0, udp0->src_port,
1461 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1465 if (is_output_feature)
1468 (nat44_ed_not_translate_output_feature
1469 (sm, ip0, ip0->protocol, udp0->src_port,
1470 udp0->dst_port, thread_index, sw_if_index0,
1471 vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1476 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1485 slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1486 next0, thread_index, now, tcp0);
1488 if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1491 if (PREDICT_FALSE (!s0))
1496 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1502 s0 = pool_elt_at_index (tsm->sessions, value0.value);
1505 b0->flags |= VNET_BUFFER_F_IS_NATED;
1507 if (!is_output_feature)
1508 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1510 old_addr0 = ip0->src_address.as_u32;
1511 new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1512 sum0 = ip0->checksum;
1513 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1515 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1516 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1517 s0->ext_host_addr.as_u32, ip4_header_t,
1519 ip0->checksum = ip_csum_fold (sum0);
1521 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1523 old_port0 = tcp0->src_port;
1524 new_port0 = tcp0->src_port = s0->out2in.port;
1526 sum0 = tcp0->checksum;
1527 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1529 sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1531 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1533 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1534 s0->ext_host_addr.as_u32,
1535 ip4_header_t, dst_address);
1536 sum0 = ip_csum_update (sum0, tcp0->dst_port,
1537 s0->ext_host_port, ip4_header_t,
1539 tcp0->dst_port = s0->ext_host_port;
1540 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1542 mss_clamping (sm, tcp0, &sum0);
1543 tcp0->checksum = ip_csum_fold (sum0);
1544 if (nat44_set_tcp_session_state_i2o
1545 (sm, s0, tcp0, thread_index))
1550 udp0->src_port = s0->out2in.port;
1552 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1554 udp0->dst_port = s0->ext_host_port;
1555 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1560 nat44_session_update_counters (s0, now,
1561 vlib_buffer_length_in_chain (vm,
1563 /* Per-user LRU list maintenance */
1564 nat44_session_update_lru (sm, s0, thread_index);
1567 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1568 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1570 nat_in2out_ed_trace_t *t =
1571 vlib_add_trace (vm, node, b0, sizeof (*t));
1572 t->is_slow_path = is_slow_path;
1573 t->sw_if_index = sw_if_index0;
1574 t->next_index = next0;
1575 t->session_index = ~0;
1577 t->session_index = s0 - tsm->sessions;
1580 pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP;
1582 /* verify speculative enqueue, maybe switch current next frame */
1583 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1584 to_next, n_left_to_next,
1588 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1591 vlib_node_increment_counter (vm, stats_node_index,
1592 NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
1594 return frame->n_vectors;
1598 nat44_ed_in2out_fast_path_fn (vlib_main_t * vm,
1599 vlib_node_runtime_t * node,
1600 vlib_frame_t * frame)
1602 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 0);
1606 VLIB_REGISTER_NODE (nat44_ed_in2out_node) = {
1607 .function = nat44_ed_in2out_fast_path_fn,
1608 .name = "nat44-ed-in2out",
1609 .vector_size = sizeof (u32),
1610 .format_trace = format_nat_in2out_ed_trace,
1611 .type = VLIB_NODE_TYPE_INTERNAL,
1612 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1613 .error_strings = nat_in2out_ed_error_strings,
1614 .runtime_data_bytes = sizeof (snat_runtime_t),
1615 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1617 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1618 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
1619 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath",
1620 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1621 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1626 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_node,
1627 nat44_ed_in2out_fast_path_fn);
1630 nat44_ed_in2out_output_fast_path_fn (vlib_main_t * vm,
1631 vlib_node_runtime_t * node,
1632 vlib_frame_t * frame)
1634 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 1);
1638 VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = {
1639 .function = nat44_ed_in2out_output_fast_path_fn,
1640 .name = "nat44-ed-in2out-output",
1641 .vector_size = sizeof (u32),
1642 .format_trace = format_nat_in2out_ed_trace,
1643 .type = VLIB_NODE_TYPE_INTERNAL,
1644 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1645 .error_strings = nat_in2out_ed_error_strings,
1646 .runtime_data_bytes = sizeof (snat_runtime_t),
1647 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1649 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1650 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
1651 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath",
1652 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1653 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass-output",
1658 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_node,
1659 nat44_ed_in2out_output_fast_path_fn);
1662 nat44_ed_in2out_slow_path_fn (vlib_main_t * vm,
1663 vlib_node_runtime_t * node,
1664 vlib_frame_t * frame)
1666 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 0);
1670 VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = {
1671 .function = nat44_ed_in2out_slow_path_fn,
1672 .name = "nat44-ed-in2out-slowpath",
1673 .vector_size = sizeof (u32),
1674 .format_trace = format_nat_in2out_ed_trace,
1675 .type = VLIB_NODE_TYPE_INTERNAL,
1676 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1677 .error_strings = nat_in2out_ed_error_strings,
1678 .runtime_data_bytes = sizeof (snat_runtime_t),
1679 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1681 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1682 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
1683 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath",
1684 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1685 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1690 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_slowpath_node,
1691 nat44_ed_in2out_slow_path_fn);
1694 nat44_ed_in2out_output_slow_path_fn (vlib_main_t * vm,
1695 vlib_node_runtime_t * node,
1696 vlib_frame_t * frame)
1698 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 1);
1702 VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = {
1703 .function = nat44_ed_in2out_output_slow_path_fn,
1704 .name = "nat44-ed-in2out-output-slowpath",
1705 .vector_size = sizeof (u32),
1706 .format_trace = format_nat_in2out_ed_trace,
1707 .type = VLIB_NODE_TYPE_INTERNAL,
1708 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1709 .error_strings = nat_in2out_ed_error_strings,
1710 .runtime_data_bytes = sizeof (snat_runtime_t),
1711 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1713 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1714 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
1715 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath",
1716 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1717 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1722 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_slowpath_node,
1723 nat44_ed_in2out_output_slow_path_fn);
1726 nat44_ed_in2out_reass_node_fn_inline (vlib_main_t * vm,
1727 vlib_node_runtime_t * node,
1728 vlib_frame_t * frame,
1729 int is_output_feature)
1731 u32 n_left_from, *from, *to_next;
1732 nat_in2out_ed_next_t next_index;
1733 u32 pkts_processed = 0;
1734 snat_main_t *sm = &snat_main;
1735 f64 now = vlib_time_now (vm);
1736 u32 thread_index = vm->thread_index;
1737 snat_main_per_thread_data_t *per_thread_data =
1738 &sm->per_thread_data[thread_index];
1739 u32 *fragments_to_drop = 0;
1740 u32 *fragments_to_loopback = 0;
1742 from = vlib_frame_vector_args (frame);
1743 n_left_from = frame->n_vectors;
1744 next_index = node->cached_next_index;
1746 while (n_left_from > 0)
1750 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1752 while (n_left_from > 0 && n_left_to_next > 0)
1754 u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
1755 u32 iph_offset0 = 0;
1759 ip4_header_t *ip0 = 0;
1760 nat_reass_ip4_t *reass0;
1763 icmp46_header_t *icmp0;
1764 clib_bihash_kv_16_8_t kv0, value0;
1765 snat_session_t *s0 = 0;
1766 u16 old_port0, new_port0;
1769 /* speculatively enqueue b0 to the current next frame */
1775 n_left_to_next -= 1;
1777 b0 = vlib_get_buffer (vm, bi0);
1779 next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1781 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1783 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1786 if (PREDICT_FALSE (nat_reass_is_drop_frag (0)))
1788 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1789 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT];
1793 if (is_output_feature)
1794 iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1796 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1799 udp0 = ip4_next_header (ip0);
1800 tcp0 = (tcp_header_t *) udp0;
1801 icmp0 = (icmp46_header_t *) udp0;
1802 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1804 reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
1808 1, &fragments_to_drop);
1810 if (PREDICT_FALSE (!reass0))
1812 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1813 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_REASS];
1814 nat_log_notice ("maximum reassemblies exceeded");
1818 if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1820 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1822 if (is_output_feature)
1825 (nat_not_translate_output_feature_fwd
1826 (sm, ip0, thread_index, now, vm, b0)))
1827 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1831 next0 = icmp_in2out_ed_slow_path
1832 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1833 next0, now, thread_index, &s0);
1835 if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP))
1838 reass0->sess_index = s0 - per_thread_data->sessions;
1840 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1841 nat_ip4_reass_get_frags (reass0,
1842 &fragments_to_loopback);
1848 make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1849 ip0->protocol, rx_fib_index0, udp0->src_port,
1852 if (clib_bihash_search_16_8
1853 (&per_thread_data->in2out_ed, &kv0, &value0))
1855 if (is_output_feature)
1858 (nat44_ed_not_translate_output_feature
1859 (sm, ip0, ip0->protocol, udp0->src_port,
1860 udp0->dst_port, thread_index, sw_if_index0,
1861 vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1863 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1864 nat_ip4_reass_get_frags (reass0,
1865 &fragments_to_loopback);
1871 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1877 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1878 nat_ip4_reass_get_frags (reass0,
1879 &fragments_to_loopback);
1884 next0 = slow_path_ed (sm, b0, rx_fib_index0, &kv0,
1885 &s0, node, next0, thread_index, now,
1888 if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1891 if (PREDICT_FALSE (!s0))
1893 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1897 reass0->sess_index = s0 - per_thread_data->sessions;
1901 s0 = pool_elt_at_index (per_thread_data->sessions,
1903 reass0->sess_index = value0.value;
1905 nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
1909 if (reass0->flags & NAT_REASS_FLAG_ED_DONT_TRANSLATE)
1911 if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
1913 if (nat_ip4_reass_add_fragment
1914 (reass0, bi0, &fragments_to_drop))
1916 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_FRAG];
1918 ("maximum fragments per reassembly exceeded");
1919 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1925 s0 = pool_elt_at_index (per_thread_data->sessions,
1926 reass0->sess_index);
1929 old_addr0 = ip0->src_address.as_u32;
1930 ip0->src_address = s0->out2in.addr;
1931 new_addr0 = ip0->src_address.as_u32;
1932 if (!is_output_feature)
1933 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1935 sum0 = ip0->checksum;
1936 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1938 src_address /* changed member */ );
1939 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1940 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1941 s0->ext_host_addr.as_u32, ip4_header_t,
1943 ip0->checksum = ip_csum_fold (sum0);
1945 if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1947 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1949 old_port0 = tcp0->src_port;
1950 tcp0->src_port = s0->out2in.port;
1951 new_port0 = tcp0->src_port;
1953 sum0 = tcp0->checksum;
1954 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1956 dst_address /* changed member */ );
1957 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1958 ip4_header_t /* cheat */ ,
1959 length /* changed member */ );
1960 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1962 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1963 s0->ext_host_addr.as_u32,
1964 ip4_header_t, dst_address);
1965 sum0 = ip_csum_update (sum0, tcp0->dst_port,
1966 s0->ext_host_port, ip4_header_t,
1968 tcp0->dst_port = s0->ext_host_port;
1969 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1971 tcp0->checksum = ip_csum_fold (sum0);
1975 old_port0 = udp0->src_port;
1976 udp0->src_port = s0->out2in.port;
1978 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1980 udp0->dst_port = s0->ext_host_port;
1981 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1987 nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port,
1988 s0->ext_host_port, proto0, 1);
1991 nat44_session_update_counters (s0, now,
1992 vlib_buffer_length_in_chain (vm,
1994 /* Per-user LRU list maintenance */
1995 nat44_session_update_lru (sm, s0, thread_index);
1998 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1999 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
2001 nat44_reass_trace_t *t =
2002 vlib_add_trace (vm, node, b0, sizeof (*t));
2003 t->cached = cached0;
2004 t->sw_if_index = sw_if_index0;
2005 t->next_index = next0;
2015 pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP;
2017 /* verify speculative enqueue, maybe switch current next frame */
2018 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2019 to_next, n_left_to_next,
2023 if (n_left_from == 0 && vec_len (fragments_to_loopback))
2025 from = vlib_frame_vector_args (frame);
2026 u32 len = vec_len (fragments_to_loopback);
2027 if (len <= VLIB_FRAME_SIZE)
2029 clib_memcpy_fast (from, fragments_to_loopback,
2030 sizeof (u32) * len);
2032 vec_reset_length (fragments_to_loopback);
2036 clib_memcpy_fast (from, fragments_to_loopback +
2037 (len - VLIB_FRAME_SIZE),
2038 sizeof (u32) * VLIB_FRAME_SIZE);
2039 n_left_from = VLIB_FRAME_SIZE;
2040 _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
2045 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2048 vlib_node_increment_counter (vm, nat44_ed_in2out_reass_node.index,
2049 NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
2052 nat_send_all_to_node (vm, fragments_to_drop, node,
2053 &node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT],
2054 NAT_IN2OUT_ED_NEXT_DROP);
2056 vec_free (fragments_to_drop);
2057 vec_free (fragments_to_loopback);
2058 return frame->n_vectors;
2062 nat44_ed_in2out_reass_node_fn (vlib_main_t * vm,
2063 vlib_node_runtime_t * node,
2064 vlib_frame_t * frame)
2066 return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 0);
2070 VLIB_REGISTER_NODE (nat44_ed_in2out_reass_node) = {
2071 .function = nat44_ed_in2out_reass_node_fn,
2072 .name = "nat44-ed-in2out-reass",
2073 .vector_size = sizeof (u32),
2074 .format_trace = format_nat44_reass_trace,
2075 .type = VLIB_NODE_TYPE_INTERNAL,
2076 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2077 .error_strings = nat_in2out_ed_error_strings,
2078 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
2080 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
2081 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
2082 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
2083 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2084 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
2089 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_node,
2090 nat44_ed_in2out_reass_node_fn);
2093 nat44_ed_in2out_reass_output_node_fn (vlib_main_t * vm,
2094 vlib_node_runtime_t * node,
2095 vlib_frame_t * frame)
2097 return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 1);
2101 VLIB_REGISTER_NODE (nat44_ed_in2out_reass_output_node) = {
2102 .function = nat44_ed_in2out_reass_output_node_fn,
2103 .name = "nat44-ed-in2out-reass-output",
2104 .vector_size = sizeof (u32),
2105 .format_trace = format_nat44_reass_trace,
2106 .type = VLIB_NODE_TYPE_INTERNAL,
2107 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2108 .error_strings = nat_in2out_ed_error_strings,
2109 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
2111 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
2112 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
2113 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
2114 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2115 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
2120 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_output_node,
2121 nat44_ed_in2out_reass_output_node_fn);
2124 * fd.io coding-style-patch-verification: ON
2127 * eval: (c-set-style "gnu")