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>
31 #include <nat/nat_syslog.h>
33 #define foreach_nat_in2out_ed_error \
34 _(UNSUPPORTED_PROTOCOL, "unsupported protocol") \
35 _(IN2OUT_PACKETS, "good in2out packets processed") \
36 _(OUT_OF_PORTS, "out of ports") \
37 _(BAD_ICMP_TYPE, "unsupported ICMP type") \
38 _(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \
39 _(DROP_FRAGMENT, "drop fragment") \
40 _(MAX_REASS, "maximum reassemblies exceeded") \
41 _(MAX_FRAG, "maximum fragments per reassembly exceeded")\
42 _(NON_SYN, "non-SYN packet try to create session") \
43 _(TCP_PACKETS, "TCP packets") \
44 _(UDP_PACKETS, "UDP packets") \
45 _(ICMP_PACKETS, "ICMP packets") \
46 _(OTHER_PACKETS, "other protocol packets") \
47 _(FRAGMENTS, "fragments") \
48 _(CACHED_FRAGMENTS, "cached fragments") \
49 _(PROCESSED_FRAGMENTS, "processed fragments")
54 #define _(sym,str) NAT_IN2OUT_ED_ERROR_##sym,
55 foreach_nat_in2out_ed_error
57 NAT_IN2OUT_ED_N_ERROR,
58 } nat_in2out_ed_error_t;
60 static char *nat_in2out_ed_error_strings[] = {
61 #define _(sym,string) string,
62 foreach_nat_in2out_ed_error
68 NAT_IN2OUT_ED_NEXT_LOOKUP,
69 NAT_IN2OUT_ED_NEXT_DROP,
70 NAT_IN2OUT_ED_NEXT_ICMP_ERROR,
71 NAT_IN2OUT_ED_NEXT_SLOW_PATH,
72 NAT_IN2OUT_ED_NEXT_REASS,
74 } nat_in2out_ed_next_t;
82 } nat_in2out_ed_trace_t;
84 vlib_node_registration_t nat44_ed_in2out_node;
85 vlib_node_registration_t nat44_ed_in2out_slowpath_node;
86 vlib_node_registration_t nat44_ed_in2out_output_node;
87 vlib_node_registration_t nat44_ed_in2out_output_slowpath_node;
88 vlib_node_registration_t nat44_ed_in2out_reass_node;
91 format_nat_in2out_ed_trace (u8 * s, va_list * args)
93 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
94 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
95 nat_in2out_ed_trace_t *t = va_arg (*args, nat_in2out_ed_trace_t *);
99 t->is_slow_path ? "NAT44_IN2OUT_ED_SLOW_PATH" :
100 "NAT44_IN2OUT_ED_FAST_PATH";
102 s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
103 t->sw_if_index, t->next_index, t->session_index);
108 static_always_inline int
109 icmp_get_ed_key (ip4_header_t * ip0, nat_ed_ses_key_t * p_key0)
111 icmp46_header_t *icmp0;
112 nat_ed_ses_key_t key0;
113 icmp_echo_header_t *echo0, *inner_echo0 = 0;
114 ip4_header_t *inner_ip0 = 0;
116 icmp46_header_t *inner_icmp0;
118 icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
119 echo0 = (icmp_echo_header_t *) (icmp0 + 1);
121 if (!icmp_is_error_message (icmp0))
123 key0.proto = IP_PROTOCOL_ICMP;
124 key0.l_addr = ip0->src_address;
125 key0.r_addr = ip0->dst_address;
126 key0.l_port = echo0->identifier;
131 inner_ip0 = (ip4_header_t *) (echo0 + 1);
132 l4_header = ip4_next_header (inner_ip0);
133 key0.proto = inner_ip0->protocol;
134 key0.r_addr = inner_ip0->src_address;
135 key0.l_addr = inner_ip0->dst_address;
136 switch (ip_proto_to_snat_proto (inner_ip0->protocol))
138 case SNAT_PROTOCOL_ICMP:
139 inner_icmp0 = (icmp46_header_t *) l4_header;
140 inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
142 key0.l_port = inner_echo0->identifier;
144 case SNAT_PROTOCOL_UDP:
145 case SNAT_PROTOCOL_TCP:
146 key0.l_port = ((tcp_udp_header_t *) l4_header)->dst_port;
147 key0.r_port = ((tcp_udp_header_t *) l4_header)->src_port;
150 return NAT_IN2OUT_ED_ERROR_UNSUPPORTED_PROTOCOL;
158 nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
160 snat_main_t *sm = &snat_main;
161 nat44_is_idle_session_ctx_t *ctx = arg;
163 u64 sess_timeout_time;
164 nat_ed_ses_key_t ed_key;
165 clib_bihash_kv_16_8_t ed_kv;
168 snat_session_key_t key;
169 snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
172 s = pool_elt_at_index (tsm->sessions, kv->value);
173 sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
174 if (ctx->now >= sess_timeout_time)
176 if (is_fwd_bypass_session (s))
179 ed_key.l_addr = s->out2in.addr;
180 ed_key.r_addr = s->ext_host_addr;
181 ed_key.fib_index = s->out2in.fib_index;
182 if (snat_is_unk_proto_session (s))
184 ed_key.proto = s->in2out.port;
190 ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol);
191 ed_key.l_port = s->out2in.port;
192 ed_key.r_port = s->ext_host_port;
194 ed_kv.key[0] = ed_key.as_u64[0];
195 ed_kv.key[1] = ed_key.as_u64[1];
196 if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &ed_kv, 0))
197 nat_log_warn ("out2in_ed key del failed");
199 if (snat_is_unk_proto_session (s))
202 snat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
203 s->in2out.addr.as_u32,
204 s->out2in.addr.as_u32,
208 s->in2out.fib_index);
210 nat_syslog_nat44_sdel (s->user_index, s->in2out.fib_index,
211 &s->in2out.addr, s->in2out.port,
212 &s->ext_host_nat_addr, s->ext_host_nat_port,
213 &s->out2in.addr, s->out2in.port,
214 &s->ext_host_addr, s->ext_host_port,
215 s->in2out.protocol, is_twice_nat_session (s));
217 if (is_twice_nat_session (s))
219 for (i = 0; i < vec_len (sm->twice_nat_addresses); i++)
221 key.protocol = s->in2out.protocol;
222 key.port = s->ext_host_nat_port;
223 a = sm->twice_nat_addresses + i;
224 if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
226 snat_free_outside_address_and_port (sm->twice_nat_addresses,
234 if (snat_is_session_static (s))
237 snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
240 nat44_delete_session (sm, s, ctx->thread_index);
248 icmp_in2out_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
249 ip4_header_t * ip0, icmp46_header_t * icmp0,
250 u32 sw_if_index0, u32 rx_fib_index0,
251 vlib_node_runtime_t * node, u32 next0, f64 now,
252 u32 thread_index, snat_session_t ** p_s0)
254 next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
255 next0, thread_index, p_s0, 0);
256 snat_session_t *s0 = *p_s0;
257 if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP && s0))
260 nat44_session_update_counters (s0, now,
261 vlib_buffer_length_in_chain
262 (sm->vlib_main, b0));
263 /* Per-user LRU list maintenance */
264 nat44_session_update_lru (sm, s0, thread_index);
270 slow_path_ed (snat_main_t * sm,
273 clib_bihash_kv_16_8_t * kv,
274 snat_session_t ** sessionp,
275 vlib_node_runtime_t * node, u32 next, u32 thread_index, f64 now,
278 snat_session_t *s = 0;
280 snat_session_key_t key0, key1;
281 lb_nat_type_t lb = 0, is_sm = 0;
282 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
283 nat_ed_ses_key_t *key = (nat_ed_ses_key_t *) kv->key;
284 u32 proto = ip_proto_to_snat_proto (key->proto);
285 nat_outside_fib_t *outside_fib;
286 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
289 .fp_proto = FIB_PROTOCOL_IP4,
292 .ip4.as_u32 = key->r_addr.as_u32,
295 nat44_is_idle_session_ctx_t ctx;
297 if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
299 b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
300 nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
301 nat_log_notice ("maximum sessions exceeded");
302 return NAT_IN2OUT_ED_NEXT_DROP;
305 key0.addr = key->l_addr;
306 key0.port = key->l_port;
307 key1.protocol = key0.protocol = proto;
308 key0.fib_index = rx_fib_index;
309 key1.fib_index = sm->outside_fib_index;
310 /* First try to match static mapping by local address and port */
311 if (snat_static_mapping_match
312 (sm, key0, &key1, 0, 0, 0, &lb, 0, &identity_nat))
314 /* Try to create dynamic translation */
315 if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index,
318 tsm->snat_thread_index))
320 nat_log_notice ("addresses exhausted");
321 b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS];
322 return NAT_IN2OUT_ED_NEXT_DROP;
327 if (PREDICT_FALSE (identity_nat))
336 if (proto == SNAT_PROTOCOL_TCP)
338 if (!tcp_is_init (tcp))
340 b->error = node->errors[NAT_IN2OUT_ED_ERROR_NON_SYN];
341 return NAT_IN2OUT_ED_NEXT_DROP;
345 u = nat_user_get_or_create (sm, &key->l_addr, rx_fib_index, thread_index);
348 nat_log_warn ("create NAT user failed");
350 snat_free_outside_address_and_port (sm->addresses,
351 thread_index, &key1);
352 return NAT_IN2OUT_ED_NEXT_DROP;
355 s = nat_ed_session_alloc (sm, u, thread_index, now);
358 nat44_delete_user_with_no_session (sm, u, thread_index);
359 nat_log_warn ("create NAT session failed");
361 snat_free_outside_address_and_port (sm->addresses,
362 thread_index, &key1);
363 return NAT_IN2OUT_ED_NEXT_DROP;
366 user_session_increment (sm, u, is_sm);
368 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
370 s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
371 s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
372 s->ext_host_addr = key->r_addr;
373 s->ext_host_port = key->r_port;
376 s->out2in.protocol = key0.protocol;
378 switch (vec_len (sm->outside_fibs))
381 s->out2in.fib_index = sm->outside_fib_index;
384 s->out2in.fib_index = sm->outside_fibs[0].fib_index;
388 vec_foreach (outside_fib, sm->outside_fibs)
390 fei = fib_table_lookup (outside_fib->fib_index, &pfx);
391 if (FIB_NODE_INDEX_INVALID != fei)
393 if (fib_entry_get_resolving_interface (fei) != ~0)
395 s->out2in.fib_index = outside_fib->fib_index;
404 /* Add to lookup tables */
405 kv->value = s - tsm->sessions;
407 ctx.thread_index = thread_index;
408 if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, kv,
409 nat44_i2o_ed_is_idle_session_cb,
411 nat_log_notice ("in2out-ed key add failed");
413 make_ed_kv (kv, &key1.addr, &key->r_addr, key->proto, s->out2in.fib_index,
414 key1.port, key->r_port);
415 kv->value = s - tsm->sessions;
416 if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, kv,
417 nat44_o2i_ed_is_idle_session_cb,
419 nat_log_notice ("out2in-ed key add failed");
424 snat_ipfix_logging_nat44_ses_create (thread_index,
425 s->in2out.addr.as_u32,
426 s->out2in.addr.as_u32,
429 s->out2in.port, s->in2out.fib_index);
431 nat_syslog_nat44_sadd (s->user_index, s->in2out.fib_index,
432 &s->in2out.addr, s->in2out.port,
433 &s->ext_host_nat_addr, s->ext_host_nat_port,
434 &s->out2in.addr, s->out2in.port,
435 &s->ext_host_addr, s->ext_host_port,
436 s->in2out.protocol, 0);
441 static_always_inline int
442 nat44_ed_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
443 u32 sw_if_index, ip4_header_t * ip, u32 proto,
444 u32 rx_fib_index, u32 thread_index)
446 udp_header_t *udp = ip4_next_header (ip);
447 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
448 clib_bihash_kv_16_8_t kv, value;
449 snat_session_key_t key0, key1;
451 make_ed_kv (&kv, &ip->dst_address, &ip->src_address, ip->protocol,
452 sm->outside_fib_index, udp->dst_port, udp->src_port);
454 /* NAT packet aimed at external address if */
455 /* has active sessions */
456 if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
458 key0.addr = ip->dst_address;
459 key0.port = udp->dst_port;
460 key0.protocol = proto;
461 key0.fib_index = sm->outside_fib_index;
462 /* or is static mappings */
463 if (!snat_static_mapping_match (sm, key0, &key1, 1, 0, 0, 0, 0, 0))
469 if (sm->forwarding_enabled)
472 return snat_not_translate_fast (sm, node, sw_if_index, ip, proto,
476 static_always_inline int
477 nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip,
478 u32 thread_index, f64 now,
479 vlib_main_t * vm, vlib_buffer_t * b)
481 nat_ed_ses_key_t key;
482 clib_bihash_kv_16_8_t kv, value;
484 snat_session_t *s = 0;
485 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
487 if (!sm->forwarding_enabled)
490 if (ip->protocol == IP_PROTOCOL_ICMP)
492 key.as_u64[0] = key.as_u64[1] = 0;
493 if (icmp_get_ed_key (ip, &key))
496 kv.key[0] = key.as_u64[0];
497 kv.key[1] = key.as_u64[1];
499 else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
501 udp = ip4_next_header (ip);
502 make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0,
503 udp->src_port, udp->dst_port);
507 make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0, 0,
511 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
513 s = pool_elt_at_index (tsm->sessions, value.value);
514 if (is_fwd_bypass_session (s))
516 if (ip->protocol == IP_PROTOCOL_TCP)
518 tcp_header_t *tcp = ip4_next_header (ip);
519 if (nat44_set_tcp_session_state_i2o (sm, s, tcp, thread_index))
523 nat44_session_update_counters (s, now,
524 vlib_buffer_length_in_chain (vm, b));
525 /* Per-user LRU list maintenance */
526 nat44_session_update_lru (sm, s, thread_index);
536 static_always_inline int
537 nat44_ed_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip,
538 u8 proto, u16 src_port, u16 dst_port,
539 u32 thread_index, u32 rx_sw_if_index,
542 clib_bihash_kv_16_8_t kv, value;
543 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
546 u32 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (rx_sw_if_index);
547 u32 tx_fib_index = ip4_fib_table_get_index_for_sw_if_index (tx_sw_if_index);
550 make_ed_kv (&kv, &ip->src_address, &ip->dst_address, proto, tx_fib_index,
552 if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
554 s = pool_elt_at_index (tsm->sessions, value.value);
555 if (nat44_is_ses_closed (s))
557 nat_log_debug ("TCP close connection %U", format_snat_session,
558 &sm->per_thread_data[thread_index], s);
559 nat_free_session_data (sm, s, thread_index);
560 nat44_delete_session (sm, s, thread_index);
563 s->flags |= SNAT_SESSION_FLAG_OUTPUT_FEATURE;
568 make_ed_kv (&kv, &ip->dst_address, &ip->src_address, proto, rx_fib_index,
570 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
572 s = pool_elt_at_index (tsm->sessions, value.value);
573 if (is_fwd_bypass_session (s))
578 pool_foreach (i, sm->output_feature_interfaces,
580 if ((nat_interface_is_inside (i)) && (rx_sw_if_index == i->sw_if_index))
591 icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node,
592 u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip,
593 u8 * p_proto, snat_session_key_t * p_value,
594 u8 * p_dont_translate, void *d, void *e)
596 icmp46_header_t *icmp;
599 nat_ed_ses_key_t key;
600 snat_session_t *s = 0;
601 u8 dont_translate = 0;
602 clib_bihash_kv_16_8_t kv, value;
605 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
607 icmp = (icmp46_header_t *) ip4_next_header (ip);
608 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
609 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
611 key.as_u64[0] = key.as_u64[1] = 0;
612 err = icmp_get_ed_key (ip, &key);
615 b->error = node->errors[err];
616 next = NAT_IN2OUT_ED_NEXT_DROP;
619 key.fib_index = rx_fib_index;
621 kv.key[0] = key.as_u64[0];
622 kv.key[1] = key.as_u64[1];
624 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
626 if (vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0)
628 if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (sm, ip,
647 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index,
648 ip, SNAT_PROTOCOL_ICMP,
657 if (PREDICT_FALSE (icmp_is_error_message (icmp)))
659 b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
660 next = NAT_IN2OUT_ED_NEXT_DROP;
664 next = slow_path_ed (sm, b, rx_fib_index, &kv, &s, node, next,
665 thread_index, vlib_time_now (sm->vlib_main), 0);
667 if (PREDICT_FALSE (next == NAT_IN2OUT_ED_NEXT_DROP))
678 if (PREDICT_FALSE (icmp->type != ICMP4_echo_request &&
679 icmp->type != ICMP4_echo_reply &&
680 !icmp_is_error_message (icmp)))
682 b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
683 next = NAT_IN2OUT_ED_NEXT_DROP;
687 s = pool_elt_at_index (tsm->sessions, value.value);
690 *p_proto = ip_proto_to_snat_proto (key.proto);
693 *p_value = s->out2in;
694 *p_dont_translate = dont_translate;
696 *(snat_session_t **) d = s;
700 static snat_session_t *
701 nat44_ed_in2out_unknown_proto (snat_main_t * sm,
707 vlib_main_t * vm, vlib_node_runtime_t * node)
709 clib_bihash_kv_8_8_t kv, value;
710 clib_bihash_kv_16_8_t s_kv, s_value;
711 snat_static_mapping_t *m;
712 u32 old_addr, new_addr = 0;
715 dlist_elt_t *head, *elt;
716 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
717 u32 elt_index, head_index, ses_index;
719 u32 outside_fib_index = sm->outside_fib_index;
722 nat_outside_fib_t *outside_fib;
723 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
725 .fp_proto = FIB_PROTOCOL_IP4,
728 .ip4.as_u32 = ip->dst_address.as_u32,
732 switch (vec_len (sm->outside_fibs))
735 outside_fib_index = sm->outside_fib_index;
738 outside_fib_index = sm->outside_fibs[0].fib_index;
742 vec_foreach (outside_fib, sm->outside_fibs)
744 fei = fib_table_lookup (outside_fib->fib_index, &pfx);
745 if (FIB_NODE_INDEX_INVALID != fei)
747 if (fib_entry_get_resolving_interface (fei) != ~0)
749 outside_fib_index = outside_fib->fib_index;
757 old_addr = ip->src_address.as_u32;
759 make_ed_kv (&s_kv, &ip->src_address, &ip->dst_address, ip->protocol,
762 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &s_kv, &s_value))
764 s = pool_elt_at_index (tsm->sessions, s_value.value);
765 new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
769 if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
771 b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
772 nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
773 nat_log_notice ("maximum sessions exceeded");
777 u = nat_user_get_or_create (sm, &ip->src_address, rx_fib_index,
781 nat_log_warn ("create NAT user failed");
785 make_sm_kv (&kv, &ip->src_address, 0, rx_fib_index, 0);
787 /* Try to find static mapping first */
788 if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
790 m = pool_elt_at_index (sm->static_mappings, value.value);
791 new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
795 /* Fallback to 3-tuple key */
798 /* Choose same out address as for TCP/UDP session to same destination */
799 head_index = u->sessions_per_user_list_head_index;
800 head = pool_elt_at_index (tsm->list_pool, head_index);
801 elt_index = head->next;
802 if (PREDICT_FALSE (elt_index == ~0))
806 elt = pool_elt_at_index (tsm->list_pool, elt_index);
807 ses_index = elt->value;
810 while (ses_index != ~0)
812 s = pool_elt_at_index (tsm->sessions, ses_index);
813 elt_index = elt->next;
814 elt = pool_elt_at_index (tsm->list_pool, elt_index);
815 ses_index = elt->value;
817 if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
819 new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
821 make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address,
822 ip->protocol, outside_fib_index, 0, 0);
823 if (clib_bihash_search_16_8
824 (&tsm->out2in_ed, &s_kv, &s_value))
831 for (i = 0; i < vec_len (sm->addresses); i++)
833 make_ed_kv (&s_kv, &sm->addresses[i].addr, &ip->dst_address,
834 ip->protocol, outside_fib_index, 0, 0);
835 if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
837 new_addr = ip->src_address.as_u32 =
838 sm->addresses[i].addr.as_u32;
846 s = nat_ed_session_alloc (sm, u, thread_index, now);
849 nat44_delete_user_with_no_session (sm, u, thread_index);
850 nat_log_warn ("create NAT session failed");
854 s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
855 s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
856 s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
857 s->out2in.addr.as_u32 = new_addr;
858 s->out2in.fib_index = outside_fib_index;
859 s->in2out.addr.as_u32 = old_addr;
860 s->in2out.fib_index = rx_fib_index;
861 s->in2out.port = s->out2in.port = ip->protocol;
863 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
864 user_session_increment (sm, u, is_sm);
866 /* Add to lookup tables */
867 make_ed_kv (&s_kv, &s->in2out.addr, &ip->dst_address, ip->protocol,
869 s_kv.value = s - tsm->sessions;
870 if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1))
871 nat_log_notice ("in2out key add failed");
873 make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address, ip->protocol,
874 outside_fib_index, 0, 0);
875 s_kv.value = s - tsm->sessions;
876 if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1))
877 nat_log_notice ("out2in key add failed");
880 /* Update IP checksum */
882 sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
883 ip->checksum = ip_csum_fold (sum);
886 nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b));
887 /* Per-user LRU list maintenance */
888 nat44_session_update_lru (sm, s, thread_index);
891 if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
892 nat44_ed_hairpinning_unknown_proto (sm, b, ip);
894 if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
895 vnet_buffer (b)->sw_if_index[VLIB_TX] = outside_fib_index;
901 nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
902 vlib_node_runtime_t * node,
903 vlib_frame_t * frame, int is_slow_path,
904 int is_output_feature)
906 u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
907 nat_in2out_ed_next_t next_index;
908 snat_main_t *sm = &snat_main;
909 f64 now = vlib_time_now (vm);
910 u32 thread_index = vm->thread_index;
911 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
912 u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
915 stats_node_index = is_slow_path ? nat44_ed_in2out_slowpath_node.index :
916 nat44_ed_in2out_node.index;
918 from = vlib_frame_vector_args (frame);
919 n_left_from = frame->n_vectors;
920 next_index = node->cached_next_index;
922 while (n_left_from > 0)
926 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
928 while (n_left_from >= 4 && n_left_to_next >= 2)
931 vlib_buffer_t *b0, *b1;
932 u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
933 new_addr0, old_addr0;
934 u32 next1, sw_if_index1, rx_fib_index1, iph_offset1 = 0, proto1,
935 new_addr1, old_addr1;
936 u16 old_port0, new_port0, old_port1, new_port1;
937 ip4_header_t *ip0, *ip1;
938 udp_header_t *udp0, *udp1;
939 tcp_header_t *tcp0, *tcp1;
940 icmp46_header_t *icmp0, *icmp1;
941 snat_session_t *s0 = 0, *s1 = 0;
942 clib_bihash_kv_16_8_t kv0, value0, kv1, value1;
943 ip_csum_t sum0, sum1;
945 /* Prefetch next iteration. */
947 vlib_buffer_t *p2, *p3;
949 p2 = vlib_get_buffer (vm, from[2]);
950 p3 = vlib_get_buffer (vm, from[3]);
952 vlib_prefetch_buffer_header (p2, LOAD);
953 vlib_prefetch_buffer_header (p3, LOAD);
955 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
956 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
959 /* speculatively enqueue b0 and b1 to the current next frame */
960 to_next[0] = bi0 = from[0];
961 to_next[1] = bi1 = from[1];
967 b0 = vlib_get_buffer (vm, bi0);
968 b1 = vlib_get_buffer (vm, bi1);
970 next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
972 if (is_output_feature)
973 iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
975 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
978 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
980 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
983 if (PREDICT_FALSE (ip0->ttl == 1))
985 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
986 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
987 ICMP4_time_exceeded_ttl_exceeded_in_transit,
989 next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
993 udp0 = ip4_next_header (ip0);
994 tcp0 = (tcp_header_t *) udp0;
995 icmp0 = (icmp46_header_t *) udp0;
996 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1000 if (PREDICT_FALSE (proto0 == ~0))
1002 s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
1004 thread_index, now, vm,
1007 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1012 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1014 next0 = icmp_in2out_ed_slow_path
1015 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1016 next0, now, thread_index, &s0);
1023 if (PREDICT_FALSE (proto0 == ~0))
1025 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1029 if (ip4_is_fragment (ip0))
1031 next0 = NAT_IN2OUT_ED_NEXT_REASS;
1036 if (is_output_feature)
1039 (nat_not_translate_output_feature_fwd
1040 (sm, ip0, thread_index, now, vm, b0)))
1044 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1046 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1051 make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1052 ip0->protocol, rx_fib_index0, udp0->src_port,
1055 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1059 if (is_output_feature)
1062 (nat44_ed_not_translate_output_feature
1063 (sm, ip0, ip0->protocol, udp0->src_port,
1064 udp0->dst_port, thread_index, sw_if_index0,
1065 vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1070 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1079 slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1080 next0, thread_index, now, tcp0);
1082 if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1085 if (PREDICT_FALSE (!s0))
1090 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1096 s0 = pool_elt_at_index (tsm->sessions, value0.value);
1099 b0->flags |= VNET_BUFFER_F_IS_NATED;
1101 if (!is_output_feature)
1102 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1104 old_addr0 = ip0->src_address.as_u32;
1105 new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1106 sum0 = ip0->checksum;
1107 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1109 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1110 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1111 s0->ext_host_addr.as_u32, ip4_header_t,
1113 ip0->checksum = ip_csum_fold (sum0);
1115 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1117 old_port0 = tcp0->src_port;
1118 new_port0 = tcp0->src_port = s0->out2in.port;
1120 sum0 = tcp0->checksum;
1121 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1123 sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1125 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1127 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1128 s0->ext_host_addr.as_u32,
1129 ip4_header_t, dst_address);
1130 sum0 = ip_csum_update (sum0, tcp0->dst_port,
1131 s0->ext_host_port, ip4_header_t,
1133 tcp0->dst_port = s0->ext_host_port;
1134 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1136 mss_clamping (sm, tcp0, &sum0);
1137 tcp0->checksum = ip_csum_fold (sum0);
1139 if (nat44_set_tcp_session_state_i2o
1140 (sm, s0, tcp0, thread_index))
1145 udp0->src_port = s0->out2in.port;
1147 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1149 udp0->dst_port = s0->ext_host_port;
1150 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1156 nat44_session_update_counters (s0, now,
1157 vlib_buffer_length_in_chain (vm,
1159 /* Per-user LRU list maintenance */
1160 nat44_session_update_lru (sm, s0, thread_index);
1163 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1164 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1166 nat_in2out_ed_trace_t *t =
1167 vlib_add_trace (vm, node, b0, sizeof (*t));
1168 t->is_slow_path = is_slow_path;
1169 t->sw_if_index = sw_if_index0;
1170 t->next_index = next0;
1171 t->session_index = ~0;
1173 t->session_index = s0 - tsm->sessions;
1176 pkts_processed += next0 == NAT_IN2OUT_ED_NEXT_LOOKUP;
1179 next1 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1181 if (is_output_feature)
1182 iph_offset1 = vnet_buffer (b1)->ip.save_rewrite_length;
1184 ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
1187 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
1189 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1192 if (PREDICT_FALSE (ip1->ttl == 1))
1194 vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1195 icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
1196 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1198 next1 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
1202 udp1 = ip4_next_header (ip1);
1203 tcp1 = (tcp_header_t *) udp1;
1204 icmp1 = (icmp46_header_t *) udp1;
1205 proto1 = ip_proto_to_snat_proto (ip1->protocol);
1209 if (PREDICT_FALSE (proto1 == ~0))
1211 s1 = nat44_ed_in2out_unknown_proto (sm, b1, ip1,
1213 thread_index, now, vm,
1216 next1 = NAT_IN2OUT_ED_NEXT_DROP;
1221 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1223 next1 = icmp_in2out_ed_slow_path
1224 (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
1225 next1, now, thread_index, &s1);
1232 if (PREDICT_FALSE (proto1 == ~0))
1234 next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1238 if (ip4_is_fragment (ip1))
1240 next1 = NAT_IN2OUT_ED_NEXT_REASS;
1245 if (is_output_feature)
1248 (nat_not_translate_output_feature_fwd
1249 (sm, ip1, thread_index, now, vm, b1)))
1253 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1255 next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1260 make_ed_kv (&kv1, &ip1->src_address, &ip1->dst_address,
1261 ip1->protocol, rx_fib_index1, udp1->src_port,
1264 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv1, &value1))
1268 if (is_output_feature)
1271 (nat44_ed_not_translate_output_feature
1272 (sm, ip1, ip1->protocol, udp1->src_port,
1273 udp1->dst_port, thread_index, sw_if_index1,
1274 vnet_buffer (b1)->sw_if_index[VLIB_TX])))
1279 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1288 slow_path_ed (sm, b1, rx_fib_index1, &kv1, &s1, node,
1289 next1, thread_index, now, tcp1);
1291 if (PREDICT_FALSE (next1 == NAT_IN2OUT_ED_NEXT_DROP))
1294 if (PREDICT_FALSE (!s1))
1299 next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1305 s1 = pool_elt_at_index (tsm->sessions, value1.value);
1308 b1->flags |= VNET_BUFFER_F_IS_NATED;
1310 if (!is_output_feature)
1311 vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
1313 old_addr1 = ip1->src_address.as_u32;
1314 new_addr1 = ip1->src_address.as_u32 = s1->out2in.addr.as_u32;
1315 sum1 = ip1->checksum;
1316 sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1318 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1319 sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1320 s1->ext_host_addr.as_u32, ip4_header_t,
1322 ip1->checksum = ip_csum_fold (sum1);
1324 if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1326 old_port1 = tcp1->src_port;
1327 new_port1 = tcp1->src_port = s1->out2in.port;
1329 sum1 = tcp1->checksum;
1330 sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1332 sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t,
1334 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1336 sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1337 s1->ext_host_addr.as_u32,
1338 ip4_header_t, dst_address);
1339 sum1 = ip_csum_update (sum1, tcp1->dst_port,
1340 s1->ext_host_port, ip4_header_t,
1342 tcp1->dst_port = s1->ext_host_port;
1343 ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1345 tcp1->checksum = ip_csum_fold (sum1);
1346 mss_clamping (sm, tcp1, &sum1);
1348 if (nat44_set_tcp_session_state_i2o
1349 (sm, s1, tcp1, thread_index))
1354 udp1->src_port = s1->out2in.port;
1356 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1358 udp1->dst_port = s1->ext_host_port;
1359 ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1365 nat44_session_update_counters (s1, now,
1366 vlib_buffer_length_in_chain (vm,
1368 /* Per-user LRU list maintenance */
1369 nat44_session_update_lru (sm, s1, thread_index);
1372 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1373 && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1375 nat_in2out_ed_trace_t *t =
1376 vlib_add_trace (vm, node, b1, sizeof (*t));
1377 t->is_slow_path = is_slow_path;
1378 t->sw_if_index = sw_if_index1;
1379 t->next_index = next1;
1380 t->session_index = ~0;
1382 t->session_index = s1 - tsm->sessions;
1385 pkts_processed += next1 == NAT_IN2OUT_ED_NEXT_LOOKUP;
1387 /* verify speculative enqueues, maybe switch current next frame */
1388 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1389 to_next, n_left_to_next,
1390 bi0, bi1, next0, next1);
1393 while (n_left_from > 0 && n_left_to_next > 0)
1397 u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
1398 new_addr0, old_addr0;
1399 u16 old_port0, new_port0;
1403 icmp46_header_t *icmp0;
1404 snat_session_t *s0 = 0;
1405 clib_bihash_kv_16_8_t kv0, value0;
1408 /* speculatively enqueue b0 to the current next frame */
1414 n_left_to_next -= 1;
1416 b0 = vlib_get_buffer (vm, bi0);
1417 next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1419 if (is_output_feature)
1420 iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1422 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1425 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1427 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1430 if (PREDICT_FALSE (ip0->ttl == 1))
1432 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1433 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1434 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1436 next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
1440 udp0 = ip4_next_header (ip0);
1441 tcp0 = (tcp_header_t *) udp0;
1442 icmp0 = (icmp46_header_t *) udp0;
1443 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1447 if (PREDICT_FALSE (proto0 == ~0))
1449 s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
1451 thread_index, now, vm,
1454 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1459 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1461 next0 = icmp_in2out_ed_slow_path
1462 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1463 next0, now, thread_index, &s0);
1470 if (PREDICT_FALSE (proto0 == ~0))
1472 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1476 if (ip4_is_fragment (ip0))
1478 next0 = NAT_IN2OUT_ED_NEXT_REASS;
1483 if (is_output_feature)
1486 (nat_not_translate_output_feature_fwd
1487 (sm, ip0, thread_index, now, vm, b0)))
1491 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1493 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1498 make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1499 ip0->protocol, rx_fib_index0, udp0->src_port,
1502 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1506 if (is_output_feature)
1509 (nat44_ed_not_translate_output_feature
1510 (sm, ip0, ip0->protocol, udp0->src_port,
1511 udp0->dst_port, thread_index, sw_if_index0,
1512 vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1517 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1526 slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1527 next0, thread_index, now, tcp0);
1529 if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1532 if (PREDICT_FALSE (!s0))
1537 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1543 s0 = pool_elt_at_index (tsm->sessions, value0.value);
1546 b0->flags |= VNET_BUFFER_F_IS_NATED;
1548 if (!is_output_feature)
1549 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1551 old_addr0 = ip0->src_address.as_u32;
1552 new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1553 sum0 = ip0->checksum;
1554 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1556 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1557 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1558 s0->ext_host_addr.as_u32, ip4_header_t,
1560 ip0->checksum = ip_csum_fold (sum0);
1562 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1564 old_port0 = tcp0->src_port;
1565 new_port0 = tcp0->src_port = s0->out2in.port;
1567 sum0 = tcp0->checksum;
1568 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1570 sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1572 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1574 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1575 s0->ext_host_addr.as_u32,
1576 ip4_header_t, dst_address);
1577 sum0 = ip_csum_update (sum0, tcp0->dst_port,
1578 s0->ext_host_port, ip4_header_t,
1580 tcp0->dst_port = s0->ext_host_port;
1581 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1583 mss_clamping (sm, tcp0, &sum0);
1584 tcp0->checksum = ip_csum_fold (sum0);
1586 if (nat44_set_tcp_session_state_i2o
1587 (sm, s0, tcp0, thread_index))
1592 udp0->src_port = s0->out2in.port;
1594 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1596 udp0->dst_port = s0->ext_host_port;
1597 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1603 nat44_session_update_counters (s0, now,
1604 vlib_buffer_length_in_chain (vm,
1606 /* Per-user LRU list maintenance */
1607 nat44_session_update_lru (sm, s0, thread_index);
1610 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1611 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1613 nat_in2out_ed_trace_t *t =
1614 vlib_add_trace (vm, node, b0, sizeof (*t));
1615 t->is_slow_path = is_slow_path;
1616 t->sw_if_index = sw_if_index0;
1617 t->next_index = next0;
1618 t->session_index = ~0;
1620 t->session_index = s0 - tsm->sessions;
1623 pkts_processed += next0 == NAT_IN2OUT_ED_NEXT_LOOKUP;
1625 /* verify speculative enqueue, maybe switch current next frame */
1626 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1627 to_next, n_left_to_next,
1631 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1634 vlib_node_increment_counter (vm, stats_node_index,
1635 NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
1637 vlib_node_increment_counter (vm, stats_node_index,
1638 NAT_IN2OUT_ED_ERROR_TCP_PACKETS, tcp_packets);
1639 vlib_node_increment_counter (vm, stats_node_index,
1640 NAT_IN2OUT_ED_ERROR_UDP_PACKETS, tcp_packets);
1641 vlib_node_increment_counter (vm, stats_node_index,
1642 NAT_IN2OUT_ED_ERROR_ICMP_PACKETS,
1644 vlib_node_increment_counter (vm, stats_node_index,
1645 NAT_IN2OUT_ED_ERROR_OTHER_PACKETS,
1647 vlib_node_increment_counter (vm, stats_node_index,
1648 NAT_IN2OUT_ED_ERROR_FRAGMENTS, fragments);
1650 return frame->n_vectors;
1654 nat44_ed_in2out_fast_path_fn (vlib_main_t * vm,
1655 vlib_node_runtime_t * node,
1656 vlib_frame_t * frame)
1658 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 0);
1662 VLIB_REGISTER_NODE (nat44_ed_in2out_node) = {
1663 .function = nat44_ed_in2out_fast_path_fn,
1664 .name = "nat44-ed-in2out",
1665 .vector_size = sizeof (u32),
1666 .format_trace = format_nat_in2out_ed_trace,
1667 .type = VLIB_NODE_TYPE_INTERNAL,
1668 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1669 .error_strings = nat_in2out_ed_error_strings,
1670 .runtime_data_bytes = sizeof (snat_runtime_t),
1671 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1673 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1674 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
1675 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath",
1676 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1677 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1682 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_node,
1683 nat44_ed_in2out_fast_path_fn);
1686 nat44_ed_in2out_output_fast_path_fn (vlib_main_t * vm,
1687 vlib_node_runtime_t * node,
1688 vlib_frame_t * frame)
1690 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 1);
1694 VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = {
1695 .function = nat44_ed_in2out_output_fast_path_fn,
1696 .name = "nat44-ed-in2out-output",
1697 .vector_size = sizeof (u32),
1698 .format_trace = format_nat_in2out_ed_trace,
1699 .type = VLIB_NODE_TYPE_INTERNAL,
1700 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1701 .error_strings = nat_in2out_ed_error_strings,
1702 .runtime_data_bytes = sizeof (snat_runtime_t),
1703 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1705 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1706 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
1707 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath",
1708 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1709 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass-output",
1714 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_node,
1715 nat44_ed_in2out_output_fast_path_fn);
1718 nat44_ed_in2out_slow_path_fn (vlib_main_t * vm,
1719 vlib_node_runtime_t * node,
1720 vlib_frame_t * frame)
1722 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 0);
1726 VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = {
1727 .function = nat44_ed_in2out_slow_path_fn,
1728 .name = "nat44-ed-in2out-slowpath",
1729 .vector_size = sizeof (u32),
1730 .format_trace = format_nat_in2out_ed_trace,
1731 .type = VLIB_NODE_TYPE_INTERNAL,
1732 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1733 .error_strings = nat_in2out_ed_error_strings,
1734 .runtime_data_bytes = sizeof (snat_runtime_t),
1735 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1737 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1738 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
1739 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath",
1740 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1741 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1746 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_slowpath_node,
1747 nat44_ed_in2out_slow_path_fn);
1750 nat44_ed_in2out_output_slow_path_fn (vlib_main_t * vm,
1751 vlib_node_runtime_t * node,
1752 vlib_frame_t * frame)
1754 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 1);
1758 VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = {
1759 .function = nat44_ed_in2out_output_slow_path_fn,
1760 .name = "nat44-ed-in2out-output-slowpath",
1761 .vector_size = sizeof (u32),
1762 .format_trace = format_nat_in2out_ed_trace,
1763 .type = VLIB_NODE_TYPE_INTERNAL,
1764 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1765 .error_strings = nat_in2out_ed_error_strings,
1766 .runtime_data_bytes = sizeof (snat_runtime_t),
1767 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1769 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1770 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
1771 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath",
1772 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1773 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1778 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_slowpath_node,
1779 nat44_ed_in2out_output_slow_path_fn);
1782 nat44_ed_in2out_reass_node_fn_inline (vlib_main_t * vm,
1783 vlib_node_runtime_t * node,
1784 vlib_frame_t * frame,
1785 int is_output_feature)
1787 u32 n_left_from, *from, *to_next;
1788 nat_in2out_ed_next_t next_index;
1789 u32 pkts_processed = 0, cached_fragments = 0;
1790 snat_main_t *sm = &snat_main;
1791 f64 now = vlib_time_now (vm);
1792 u32 thread_index = vm->thread_index;
1793 snat_main_per_thread_data_t *per_thread_data =
1794 &sm->per_thread_data[thread_index];
1795 u32 *fragments_to_drop = 0;
1796 u32 *fragments_to_loopback = 0;
1798 from = vlib_frame_vector_args (frame);
1799 n_left_from = frame->n_vectors;
1800 next_index = node->cached_next_index;
1802 while (n_left_from > 0)
1806 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1808 while (n_left_from > 0 && n_left_to_next > 0)
1810 u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
1811 u32 iph_offset0 = 0;
1815 ip4_header_t *ip0 = 0;
1816 nat_reass_ip4_t *reass0;
1819 icmp46_header_t *icmp0;
1820 clib_bihash_kv_16_8_t kv0, value0;
1821 snat_session_t *s0 = 0;
1822 u16 old_port0, new_port0;
1825 /* speculatively enqueue b0 to the current next frame */
1831 n_left_to_next -= 1;
1833 b0 = vlib_get_buffer (vm, bi0);
1835 next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1837 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1839 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1842 if (PREDICT_FALSE (nat_reass_is_drop_frag (0)))
1844 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1845 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT];
1849 if (is_output_feature)
1850 iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1852 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1855 udp0 = ip4_next_header (ip0);
1856 tcp0 = (tcp_header_t *) udp0;
1857 icmp0 = (icmp46_header_t *) udp0;
1858 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1860 reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
1864 1, &fragments_to_drop);
1866 if (PREDICT_FALSE (!reass0))
1868 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1869 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_REASS];
1870 nat_log_notice ("maximum reassemblies exceeded");
1874 if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1876 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1878 if (is_output_feature)
1881 (nat_not_translate_output_feature_fwd
1882 (sm, ip0, thread_index, now, vm, b0)))
1883 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1887 next0 = icmp_in2out_ed_slow_path
1888 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1889 next0, now, thread_index, &s0);
1891 if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP))
1894 reass0->sess_index = s0 - per_thread_data->sessions;
1896 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1897 nat_ip4_reass_get_frags (reass0,
1898 &fragments_to_loopback);
1904 make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1905 ip0->protocol, rx_fib_index0, udp0->src_port,
1908 if (clib_bihash_search_16_8
1909 (&per_thread_data->in2out_ed, &kv0, &value0))
1911 if (is_output_feature)
1914 (nat44_ed_not_translate_output_feature
1915 (sm, ip0, ip0->protocol, udp0->src_port,
1916 udp0->dst_port, thread_index, sw_if_index0,
1917 vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1919 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1920 nat_ip4_reass_get_frags (reass0,
1921 &fragments_to_loopback);
1927 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1933 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1934 nat_ip4_reass_get_frags (reass0,
1935 &fragments_to_loopback);
1940 next0 = slow_path_ed (sm, b0, rx_fib_index0, &kv0,
1941 &s0, node, next0, thread_index, now,
1944 if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1947 if (PREDICT_FALSE (!s0))
1949 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1953 reass0->sess_index = s0 - per_thread_data->sessions;
1957 s0 = pool_elt_at_index (per_thread_data->sessions,
1959 reass0->sess_index = value0.value;
1961 nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
1965 if (reass0->flags & NAT_REASS_FLAG_ED_DONT_TRANSLATE)
1967 if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
1969 if (nat_ip4_reass_add_fragment
1970 (thread_index, reass0, bi0, &fragments_to_drop))
1972 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_FRAG];
1974 ("maximum fragments per reassembly exceeded");
1975 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1981 s0 = pool_elt_at_index (per_thread_data->sessions,
1982 reass0->sess_index);
1985 old_addr0 = ip0->src_address.as_u32;
1986 ip0->src_address = s0->out2in.addr;
1987 new_addr0 = ip0->src_address.as_u32;
1988 if (!is_output_feature)
1989 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1991 sum0 = ip0->checksum;
1992 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1994 src_address /* changed member */ );
1995 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1996 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1997 s0->ext_host_addr.as_u32, ip4_header_t,
1999 ip0->checksum = ip_csum_fold (sum0);
2001 if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
2003 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
2005 old_port0 = tcp0->src_port;
2006 tcp0->src_port = s0->out2in.port;
2007 new_port0 = tcp0->src_port;
2009 sum0 = tcp0->checksum;
2010 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
2012 dst_address /* changed member */ );
2013 sum0 = ip_csum_update (sum0, old_port0, new_port0,
2014 ip4_header_t /* cheat */ ,
2015 length /* changed member */ );
2016 if (PREDICT_FALSE (is_twice_nat_session (s0)))
2018 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
2019 s0->ext_host_addr.as_u32,
2020 ip4_header_t, dst_address);
2021 sum0 = ip_csum_update (sum0, tcp0->dst_port,
2022 s0->ext_host_port, ip4_header_t,
2024 tcp0->dst_port = s0->ext_host_port;
2025 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
2027 tcp0->checksum = ip_csum_fold (sum0);
2031 old_port0 = udp0->src_port;
2032 udp0->src_port = s0->out2in.port;
2034 if (PREDICT_FALSE (is_twice_nat_session (s0)))
2036 udp0->dst_port = s0->ext_host_port;
2037 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
2043 nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port,
2044 s0->ext_host_port, proto0, 1);
2047 nat44_session_update_counters (s0, now,
2048 vlib_buffer_length_in_chain (vm,
2050 /* Per-user LRU list maintenance */
2051 nat44_session_update_lru (sm, s0, thread_index);
2054 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
2055 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
2057 nat44_reass_trace_t *t =
2058 vlib_add_trace (vm, node, b0, sizeof (*t));
2059 t->cached = cached0;
2060 t->sw_if_index = sw_if_index0;
2061 t->next_index = next0;
2072 pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP;
2074 /* verify speculative enqueue, maybe switch current next frame */
2075 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2076 to_next, n_left_to_next,
2080 if (n_left_from == 0 && vec_len (fragments_to_loopback))
2082 from = vlib_frame_vector_args (frame);
2083 u32 len = vec_len (fragments_to_loopback);
2084 if (len <= VLIB_FRAME_SIZE)
2086 clib_memcpy_fast (from, fragments_to_loopback,
2087 sizeof (u32) * len);
2089 vec_reset_length (fragments_to_loopback);
2093 clib_memcpy_fast (from, fragments_to_loopback +
2094 (len - VLIB_FRAME_SIZE),
2095 sizeof (u32) * VLIB_FRAME_SIZE);
2096 n_left_from = VLIB_FRAME_SIZE;
2097 _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
2102 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2105 vlib_node_increment_counter (vm, nat44_ed_in2out_reass_node.index,
2106 NAT_IN2OUT_ED_ERROR_PROCESSED_FRAGMENTS,
2108 vlib_node_increment_counter (vm, nat44_ed_in2out_reass_node.index,
2109 NAT_IN2OUT_ED_ERROR_CACHED_FRAGMENTS,
2112 nat_send_all_to_node (vm, fragments_to_drop, node,
2113 &node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT],
2114 NAT_IN2OUT_ED_NEXT_DROP);
2116 vec_free (fragments_to_drop);
2117 vec_free (fragments_to_loopback);
2118 return frame->n_vectors;
2122 nat44_ed_in2out_reass_node_fn (vlib_main_t * vm,
2123 vlib_node_runtime_t * node,
2124 vlib_frame_t * frame)
2126 return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 0);
2130 VLIB_REGISTER_NODE (nat44_ed_in2out_reass_node) = {
2131 .function = nat44_ed_in2out_reass_node_fn,
2132 .name = "nat44-ed-in2out-reass",
2133 .vector_size = sizeof (u32),
2134 .format_trace = format_nat44_reass_trace,
2135 .type = VLIB_NODE_TYPE_INTERNAL,
2136 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2137 .error_strings = nat_in2out_ed_error_strings,
2138 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
2140 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
2141 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
2142 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
2143 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2144 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
2149 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_node,
2150 nat44_ed_in2out_reass_node_fn);
2153 nat44_ed_in2out_reass_output_node_fn (vlib_main_t * vm,
2154 vlib_node_runtime_t * node,
2155 vlib_frame_t * frame)
2157 return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 1);
2161 VLIB_REGISTER_NODE (nat44_ed_in2out_reass_output_node) = {
2162 .function = nat44_ed_in2out_reass_output_node_fn,
2163 .name = "nat44-ed-in2out-reass-output",
2164 .vector_size = sizeof (u32),
2165 .format_trace = format_nat44_reass_trace,
2166 .type = VLIB_NODE_TYPE_INTERNAL,
2167 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2168 .error_strings = nat_in2out_ed_error_strings,
2169 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
2171 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
2172 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
2173 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
2174 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2175 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
2180 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_output_node,
2181 nat44_ed_in2out_reass_output_node_fn);
2184 * fd.io coding-style-patch-verification: ON
2187 * eval: (c-set-style "gnu")