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")
46 #define _(sym,str) NAT_IN2OUT_ED_ERROR_##sym,
47 foreach_nat_in2out_ed_error
49 NAT_IN2OUT_ED_N_ERROR,
50 } nat_in2out_ed_error_t;
52 static char *nat_in2out_ed_error_strings[] = {
53 #define _(sym,string) string,
54 foreach_nat_in2out_ed_error
60 NAT_IN2OUT_ED_NEXT_LOOKUP,
61 NAT_IN2OUT_ED_NEXT_DROP,
62 NAT_IN2OUT_ED_NEXT_ICMP_ERROR,
63 NAT_IN2OUT_ED_NEXT_SLOW_PATH,
64 NAT_IN2OUT_ED_NEXT_REASS,
66 } nat_in2out_ed_next_t;
74 } nat_in2out_ed_trace_t;
76 vlib_node_registration_t nat44_ed_in2out_node;
77 vlib_node_registration_t nat44_ed_in2out_slowpath_node;
78 vlib_node_registration_t nat44_ed_in2out_output_node;
79 vlib_node_registration_t nat44_ed_in2out_output_slowpath_node;
80 vlib_node_registration_t nat44_ed_in2out_reass_node;
83 format_nat_in2out_ed_trace (u8 * s, va_list * args)
85 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
86 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
87 nat_in2out_ed_trace_t *t = va_arg (*args, nat_in2out_ed_trace_t *);
91 t->is_slow_path ? "NAT44_IN2OUT_ED_SLOW_PATH" :
92 "NAT44_IN2OUT_ED_FAST_PATH";
94 s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
95 t->sw_if_index, t->next_index, t->session_index);
100 static_always_inline int
101 icmp_get_ed_key (ip4_header_t * ip0, nat_ed_ses_key_t * p_key0)
103 icmp46_header_t *icmp0;
104 nat_ed_ses_key_t key0;
105 icmp_echo_header_t *echo0, *inner_echo0 = 0;
106 ip4_header_t *inner_ip0 = 0;
108 icmp46_header_t *inner_icmp0;
110 icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
111 echo0 = (icmp_echo_header_t *) (icmp0 + 1);
113 if (!icmp_is_error_message (icmp0))
115 key0.proto = IP_PROTOCOL_ICMP;
116 key0.l_addr = ip0->src_address;
117 key0.r_addr = ip0->dst_address;
118 key0.l_port = echo0->identifier;
123 inner_ip0 = (ip4_header_t *) (echo0 + 1);
124 l4_header = ip4_next_header (inner_ip0);
125 key0.proto = inner_ip0->protocol;
126 key0.r_addr = inner_ip0->src_address;
127 key0.l_addr = inner_ip0->dst_address;
128 switch (ip_proto_to_snat_proto (inner_ip0->protocol))
130 case SNAT_PROTOCOL_ICMP:
131 inner_icmp0 = (icmp46_header_t *) l4_header;
132 inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
134 key0.l_port = inner_echo0->identifier;
136 case SNAT_PROTOCOL_UDP:
137 case SNAT_PROTOCOL_TCP:
138 key0.l_port = ((tcp_udp_header_t *) l4_header)->dst_port;
139 key0.r_port = ((tcp_udp_header_t *) l4_header)->src_port;
142 return NAT_IN2OUT_ED_ERROR_UNSUPPORTED_PROTOCOL;
150 nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
152 snat_main_t *sm = &snat_main;
153 nat44_is_idle_session_ctx_t *ctx = arg;
155 u64 sess_timeout_time;
156 nat_ed_ses_key_t ed_key;
157 clib_bihash_kv_16_8_t ed_kv;
160 snat_session_key_t key;
161 snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
164 s = pool_elt_at_index (tsm->sessions, kv->value);
165 sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
166 if (ctx->now >= sess_timeout_time)
168 if (is_fwd_bypass_session (s))
171 ed_key.l_addr = s->out2in.addr;
172 ed_key.r_addr = s->ext_host_addr;
173 ed_key.fib_index = s->out2in.fib_index;
174 if (snat_is_unk_proto_session (s))
176 ed_key.proto = s->in2out.port;
182 ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol);
183 ed_key.l_port = s->out2in.port;
184 ed_key.r_port = s->ext_host_port;
186 ed_kv.key[0] = ed_key.as_u64[0];
187 ed_kv.key[1] = ed_key.as_u64[1];
188 if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &ed_kv, 0))
189 nat_log_warn ("out2in_ed key del failed");
191 if (snat_is_unk_proto_session (s))
194 snat_ipfix_logging_nat44_ses_delete (s->in2out.addr.as_u32,
195 s->out2in.addr.as_u32,
199 s->in2out.fib_index);
201 nat_syslog_nat44_sdel (s->user_index, s->in2out.fib_index,
202 &s->in2out.addr, s->in2out.port,
203 &s->ext_host_nat_addr, s->ext_host_nat_port,
204 &s->out2in.addr, s->out2in.port,
205 &s->ext_host_addr, s->ext_host_port,
206 s->in2out.protocol, is_twice_nat_session (s));
208 if (is_twice_nat_session (s))
210 for (i = 0; i < vec_len (sm->twice_nat_addresses); i++)
212 key.protocol = s->in2out.protocol;
213 key.port = s->ext_host_nat_port;
214 a = sm->twice_nat_addresses + i;
215 if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
217 snat_free_outside_address_and_port (sm->twice_nat_addresses,
225 if (snat_is_session_static (s))
228 snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
231 nat44_delete_session (sm, s, ctx->thread_index);
239 icmp_in2out_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
240 ip4_header_t * ip0, icmp46_header_t * icmp0,
241 u32 sw_if_index0, u32 rx_fib_index0,
242 vlib_node_runtime_t * node, u32 next0, f64 now,
243 u32 thread_index, snat_session_t ** p_s0)
245 next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
246 next0, thread_index, p_s0, 0);
247 snat_session_t *s0 = *p_s0;
248 if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP && s0))
251 nat44_session_update_counters (s0, now,
252 vlib_buffer_length_in_chain
253 (sm->vlib_main, b0));
254 /* Per-user LRU list maintenance */
255 nat44_session_update_lru (sm, s0, thread_index);
261 slow_path_ed (snat_main_t * sm,
264 clib_bihash_kv_16_8_t * kv,
265 snat_session_t ** sessionp,
266 vlib_node_runtime_t * node, u32 next, u32 thread_index, f64 now,
269 snat_session_t *s = 0;
271 snat_session_key_t key0, key1;
272 lb_nat_type_t lb = 0, is_sm = 0;
273 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
274 nat_ed_ses_key_t *key = (nat_ed_ses_key_t *) kv->key;
275 u32 proto = ip_proto_to_snat_proto (key->proto);
276 nat_outside_fib_t *outside_fib;
277 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
280 .fp_proto = FIB_PROTOCOL_IP4,
283 .ip4.as_u32 = key->r_addr.as_u32,
286 nat44_is_idle_session_ctx_t ctx;
288 if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
290 b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
291 nat_ipfix_logging_max_sessions (sm->max_translations);
292 nat_log_notice ("maximum sessions exceeded");
293 return NAT_IN2OUT_ED_NEXT_DROP;
296 key0.addr = key->l_addr;
297 key0.port = key->l_port;
298 key1.protocol = key0.protocol = proto;
299 key0.fib_index = rx_fib_index;
300 key1.fib_index = sm->outside_fib_index;
301 /* First try to match static mapping by local address and port */
302 if (snat_static_mapping_match
303 (sm, key0, &key1, 0, 0, 0, &lb, 0, &identity_nat))
305 /* Try to create dynamic translation */
306 if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index,
309 tsm->snat_thread_index))
311 nat_log_notice ("addresses exhausted");
312 b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS];
313 return NAT_IN2OUT_ED_NEXT_DROP;
318 if (PREDICT_FALSE (identity_nat))
327 if (proto == SNAT_PROTOCOL_TCP)
329 if (!tcp_is_init (tcp))
331 b->error = node->errors[NAT_IN2OUT_ED_ERROR_NON_SYN];
332 return NAT_IN2OUT_ED_NEXT_DROP;
336 u = nat_user_get_or_create (sm, &key->l_addr, rx_fib_index, thread_index);
339 nat_log_warn ("create NAT user failed");
341 snat_free_outside_address_and_port (sm->addresses,
342 thread_index, &key1);
343 return NAT_IN2OUT_ED_NEXT_DROP;
346 s = nat_ed_session_alloc (sm, u, thread_index, now);
349 nat44_delete_user_with_no_session (sm, u, thread_index);
350 nat_log_warn ("create NAT session failed");
352 snat_free_outside_address_and_port (sm->addresses,
353 thread_index, &key1);
354 return NAT_IN2OUT_ED_NEXT_DROP;
357 user_session_increment (sm, u, is_sm);
359 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
361 s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
362 s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
363 s->ext_host_addr = key->r_addr;
364 s->ext_host_port = key->r_port;
367 s->out2in.protocol = key0.protocol;
369 switch (vec_len (sm->outside_fibs))
372 s->out2in.fib_index = sm->outside_fib_index;
375 s->out2in.fib_index = sm->outside_fibs[0].fib_index;
379 vec_foreach (outside_fib, sm->outside_fibs)
381 fei = fib_table_lookup (outside_fib->fib_index, &pfx);
382 if (FIB_NODE_INDEX_INVALID != fei)
384 if (fib_entry_get_resolving_interface (fei) != ~0)
386 s->out2in.fib_index = outside_fib->fib_index;
395 /* Add to lookup tables */
396 kv->value = s - tsm->sessions;
398 ctx.thread_index = thread_index;
399 if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, kv,
400 nat44_i2o_ed_is_idle_session_cb,
402 nat_log_notice ("in2out-ed key add failed");
404 make_ed_kv (kv, &key1.addr, &key->r_addr, key->proto, s->out2in.fib_index,
405 key1.port, key->r_port);
406 kv->value = s - tsm->sessions;
407 if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, kv,
408 nat44_o2i_ed_is_idle_session_cb,
410 nat_log_notice ("out2in-ed key add failed");
415 snat_ipfix_logging_nat44_ses_create (s->in2out.addr.as_u32,
416 s->out2in.addr.as_u32,
419 s->out2in.port, s->in2out.fib_index);
421 nat_syslog_nat44_sadd (s->user_index, s->in2out.fib_index,
422 &s->in2out.addr, s->in2out.port,
423 &s->ext_host_nat_addr, s->ext_host_nat_port,
424 &s->out2in.addr, s->out2in.port,
425 &s->ext_host_addr, s->ext_host_port,
426 s->in2out.protocol, 0);
431 static_always_inline int
432 nat44_ed_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
433 u32 sw_if_index, ip4_header_t * ip, u32 proto,
434 u32 rx_fib_index, u32 thread_index)
436 udp_header_t *udp = ip4_next_header (ip);
437 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
438 clib_bihash_kv_16_8_t kv, value;
439 snat_session_key_t key0, key1;
441 make_ed_kv (&kv, &ip->dst_address, &ip->src_address, ip->protocol,
442 sm->outside_fib_index, udp->dst_port, udp->src_port);
444 /* NAT packet aimed at external address if */
445 /* has active sessions */
446 if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
448 key0.addr = ip->dst_address;
449 key0.port = udp->dst_port;
450 key0.protocol = proto;
451 key0.fib_index = sm->outside_fib_index;
452 /* or is static mappings */
453 if (!snat_static_mapping_match (sm, key0, &key1, 1, 0, 0, 0, 0, 0))
459 if (sm->forwarding_enabled)
462 return snat_not_translate_fast (sm, node, sw_if_index, ip, proto,
466 static_always_inline int
467 nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip,
468 u32 thread_index, f64 now,
469 vlib_main_t * vm, vlib_buffer_t * b)
471 nat_ed_ses_key_t key;
472 clib_bihash_kv_16_8_t kv, value;
474 snat_session_t *s = 0;
475 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
477 if (!sm->forwarding_enabled)
480 if (ip->protocol == IP_PROTOCOL_ICMP)
482 key.as_u64[0] = key.as_u64[1] = 0;
483 if (icmp_get_ed_key (ip, &key))
486 kv.key[0] = key.as_u64[0];
487 kv.key[1] = key.as_u64[1];
489 else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
491 udp = ip4_next_header (ip);
492 make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0,
493 udp->src_port, udp->dst_port);
497 make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0, 0,
501 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
503 s = pool_elt_at_index (tsm->sessions, value.value);
504 if (is_fwd_bypass_session (s))
506 if (ip->protocol == IP_PROTOCOL_TCP)
508 tcp_header_t *tcp = ip4_next_header (ip);
509 if (nat44_set_tcp_session_state_i2o (sm, s, tcp, thread_index))
513 nat44_session_update_counters (s, now,
514 vlib_buffer_length_in_chain (vm, b));
515 /* Per-user LRU list maintenance */
516 nat44_session_update_lru (sm, s, thread_index);
526 static_always_inline int
527 nat44_ed_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip,
528 u8 proto, u16 src_port, u16 dst_port,
529 u32 thread_index, u32 rx_sw_if_index,
532 clib_bihash_kv_16_8_t kv, value;
533 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
536 u32 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (rx_sw_if_index);
537 u32 tx_fib_index = ip4_fib_table_get_index_for_sw_if_index (tx_sw_if_index);
540 make_ed_kv (&kv, &ip->src_address, &ip->dst_address, proto, tx_fib_index,
542 if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
544 s = pool_elt_at_index (tsm->sessions, value.value);
545 if (nat44_is_ses_closed (s))
547 nat_log_debug ("TCP close connection %U", format_snat_session,
548 &sm->per_thread_data[thread_index], s);
549 nat_free_session_data (sm, s, thread_index);
550 nat44_delete_session (sm, s, thread_index);
553 s->flags |= SNAT_SESSION_FLAG_OUTPUT_FEATURE;
558 make_ed_kv (&kv, &ip->dst_address, &ip->src_address, proto, rx_fib_index,
560 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
562 s = pool_elt_at_index (tsm->sessions, value.value);
563 if (is_fwd_bypass_session (s))
568 pool_foreach (i, sm->output_feature_interfaces,
570 if ((nat_interface_is_inside (i)) && (rx_sw_if_index == i->sw_if_index))
581 icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node,
582 u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip,
583 u8 * p_proto, snat_session_key_t * p_value,
584 u8 * p_dont_translate, void *d, void *e)
586 icmp46_header_t *icmp;
589 nat_ed_ses_key_t key;
590 snat_session_t *s = 0;
591 u8 dont_translate = 0;
592 clib_bihash_kv_16_8_t kv, value;
595 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
597 icmp = (icmp46_header_t *) ip4_next_header (ip);
598 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
599 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
601 key.as_u64[0] = key.as_u64[1] = 0;
602 err = icmp_get_ed_key (ip, &key);
605 b->error = node->errors[err];
606 next = NAT_IN2OUT_ED_NEXT_DROP;
609 key.fib_index = rx_fib_index;
611 kv.key[0] = key.as_u64[0];
612 kv.key[1] = key.as_u64[1];
614 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
616 if (vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0)
618 if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (sm, ip,
637 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index,
638 ip, SNAT_PROTOCOL_ICMP,
647 if (PREDICT_FALSE (icmp_is_error_message (icmp)))
649 b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
650 next = NAT_IN2OUT_ED_NEXT_DROP;
654 next = slow_path_ed (sm, b, rx_fib_index, &kv, &s, node, next,
655 thread_index, vlib_time_now (sm->vlib_main), 0);
657 if (PREDICT_FALSE (next == NAT_IN2OUT_ED_NEXT_DROP))
668 if (PREDICT_FALSE (icmp->type != ICMP4_echo_request &&
669 icmp->type != ICMP4_echo_reply &&
670 !icmp_is_error_message (icmp)))
672 b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
673 next = NAT_IN2OUT_ED_NEXT_DROP;
677 s = pool_elt_at_index (tsm->sessions, value.value);
680 *p_proto = ip_proto_to_snat_proto (key.proto);
683 *p_value = s->out2in;
684 *p_dont_translate = dont_translate;
686 *(snat_session_t **) d = s;
690 static snat_session_t *
691 nat44_ed_in2out_unknown_proto (snat_main_t * sm,
697 vlib_main_t * vm, vlib_node_runtime_t * node)
699 clib_bihash_kv_8_8_t kv, value;
700 clib_bihash_kv_16_8_t s_kv, s_value;
701 snat_static_mapping_t *m;
702 u32 old_addr, new_addr = 0;
705 dlist_elt_t *head, *elt;
706 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
707 u32 elt_index, head_index, ses_index;
709 u32 outside_fib_index = sm->outside_fib_index;
712 nat_outside_fib_t *outside_fib;
713 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
715 .fp_proto = FIB_PROTOCOL_IP4,
718 .ip4.as_u32 = ip->dst_address.as_u32,
722 switch (vec_len (sm->outside_fibs))
725 outside_fib_index = sm->outside_fib_index;
728 outside_fib_index = sm->outside_fibs[0].fib_index;
732 vec_foreach (outside_fib, sm->outside_fibs)
734 fei = fib_table_lookup (outside_fib->fib_index, &pfx);
735 if (FIB_NODE_INDEX_INVALID != fei)
737 if (fib_entry_get_resolving_interface (fei) != ~0)
739 outside_fib_index = outside_fib->fib_index;
747 old_addr = ip->src_address.as_u32;
749 make_ed_kv (&s_kv, &ip->src_address, &ip->dst_address, ip->protocol,
752 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &s_kv, &s_value))
754 s = pool_elt_at_index (tsm->sessions, s_value.value);
755 new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
759 if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
761 b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
762 nat_ipfix_logging_max_sessions (sm->max_translations);
763 nat_log_notice ("maximum sessions exceeded");
767 u = nat_user_get_or_create (sm, &ip->src_address, rx_fib_index,
771 nat_log_warn ("create NAT user failed");
775 make_sm_kv (&kv, &ip->src_address, 0, rx_fib_index, 0);
777 /* Try to find static mapping first */
778 if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
780 m = pool_elt_at_index (sm->static_mappings, value.value);
781 new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
785 /* Fallback to 3-tuple key */
788 /* Choose same out address as for TCP/UDP session to same destination */
789 head_index = u->sessions_per_user_list_head_index;
790 head = pool_elt_at_index (tsm->list_pool, head_index);
791 elt_index = head->next;
792 if (PREDICT_FALSE (elt_index == ~0))
796 elt = pool_elt_at_index (tsm->list_pool, elt_index);
797 ses_index = elt->value;
800 while (ses_index != ~0)
802 s = pool_elt_at_index (tsm->sessions, ses_index);
803 elt_index = elt->next;
804 elt = pool_elt_at_index (tsm->list_pool, elt_index);
805 ses_index = elt->value;
807 if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
809 new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
811 make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address,
812 ip->protocol, outside_fib_index, 0, 0);
813 if (clib_bihash_search_16_8
814 (&tsm->out2in_ed, &s_kv, &s_value))
821 for (i = 0; i < vec_len (sm->addresses); i++)
823 make_ed_kv (&s_kv, &sm->addresses[i].addr, &ip->dst_address,
824 ip->protocol, outside_fib_index, 0, 0);
825 if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
827 new_addr = ip->src_address.as_u32 =
828 sm->addresses[i].addr.as_u32;
836 s = nat_ed_session_alloc (sm, u, thread_index, now);
839 nat44_delete_user_with_no_session (sm, u, thread_index);
840 nat_log_warn ("create NAT session failed");
844 s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
845 s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
846 s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
847 s->out2in.addr.as_u32 = new_addr;
848 s->out2in.fib_index = outside_fib_index;
849 s->in2out.addr.as_u32 = old_addr;
850 s->in2out.fib_index = rx_fib_index;
851 s->in2out.port = s->out2in.port = ip->protocol;
853 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
854 user_session_increment (sm, u, is_sm);
856 /* Add to lookup tables */
857 make_ed_kv (&s_kv, &s->in2out.addr, &ip->dst_address, ip->protocol,
859 s_kv.value = s - tsm->sessions;
860 if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1))
861 nat_log_notice ("in2out key add failed");
863 make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address, ip->protocol,
864 outside_fib_index, 0, 0);
865 s_kv.value = s - tsm->sessions;
866 if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1))
867 nat_log_notice ("out2in key add failed");
870 /* Update IP checksum */
872 sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
873 ip->checksum = ip_csum_fold (sum);
876 nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b));
877 /* Per-user LRU list maintenance */
878 nat44_session_update_lru (sm, s, thread_index);
881 if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
882 nat44_ed_hairpinning_unknown_proto (sm, b, ip);
884 if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
885 vnet_buffer (b)->sw_if_index[VLIB_TX] = outside_fib_index;
891 nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
892 vlib_node_runtime_t * node,
893 vlib_frame_t * frame, int is_slow_path,
894 int is_output_feature)
896 u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
897 nat_in2out_ed_next_t next_index;
898 snat_main_t *sm = &snat_main;
899 f64 now = vlib_time_now (vm);
900 u32 thread_index = vm->thread_index;
901 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
903 stats_node_index = is_slow_path ? nat44_ed_in2out_slowpath_node.index :
904 nat44_ed_in2out_node.index;
906 from = vlib_frame_vector_args (frame);
907 n_left_from = frame->n_vectors;
908 next_index = node->cached_next_index;
910 while (n_left_from > 0)
914 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
916 while (n_left_from >= 4 && n_left_to_next >= 2)
919 vlib_buffer_t *b0, *b1;
920 u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
921 new_addr0, old_addr0;
922 u32 next1, sw_if_index1, rx_fib_index1, iph_offset1 = 0, proto1,
923 new_addr1, old_addr1;
924 u16 old_port0, new_port0, old_port1, new_port1;
925 ip4_header_t *ip0, *ip1;
926 udp_header_t *udp0, *udp1;
927 tcp_header_t *tcp0, *tcp1;
928 icmp46_header_t *icmp0, *icmp1;
929 snat_session_t *s0 = 0, *s1 = 0;
930 clib_bihash_kv_16_8_t kv0, value0, kv1, value1;
931 ip_csum_t sum0, sum1;
933 /* Prefetch next iteration. */
935 vlib_buffer_t *p2, *p3;
937 p2 = vlib_get_buffer (vm, from[2]);
938 p3 = vlib_get_buffer (vm, from[3]);
940 vlib_prefetch_buffer_header (p2, LOAD);
941 vlib_prefetch_buffer_header (p3, LOAD);
943 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
944 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
947 /* speculatively enqueue b0 and b1 to the current next frame */
948 to_next[0] = bi0 = from[0];
949 to_next[1] = bi1 = from[1];
955 b0 = vlib_get_buffer (vm, bi0);
956 b1 = vlib_get_buffer (vm, bi1);
958 next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
960 if (is_output_feature)
961 iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
963 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
966 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
968 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
971 if (PREDICT_FALSE (ip0->ttl == 1))
973 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
974 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
975 ICMP4_time_exceeded_ttl_exceeded_in_transit,
977 next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
981 udp0 = ip4_next_header (ip0);
982 tcp0 = (tcp_header_t *) udp0;
983 icmp0 = (icmp46_header_t *) udp0;
984 proto0 = ip_proto_to_snat_proto (ip0->protocol);
988 if (PREDICT_FALSE (proto0 == ~0))
990 s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
992 thread_index, now, vm,
995 next0 = NAT_IN2OUT_ED_NEXT_DROP;
999 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1001 next0 = icmp_in2out_ed_slow_path
1002 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1003 next0, now, thread_index, &s0);
1009 if (PREDICT_FALSE (proto0 == ~0))
1011 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1015 if (ip4_is_fragment (ip0))
1017 next0 = NAT_IN2OUT_ED_NEXT_REASS;
1021 if (is_output_feature)
1024 (nat_not_translate_output_feature_fwd
1025 (sm, ip0, thread_index, now, vm, b0)))
1029 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1031 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1036 make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1037 ip0->protocol, rx_fib_index0, udp0->src_port,
1040 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1044 if (is_output_feature)
1047 (nat44_ed_not_translate_output_feature
1048 (sm, ip0, ip0->protocol, udp0->src_port,
1049 udp0->dst_port, thread_index, sw_if_index0,
1050 vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1055 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1064 slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1065 next0, thread_index, now, tcp0);
1067 if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1070 if (PREDICT_FALSE (!s0))
1075 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1081 s0 = pool_elt_at_index (tsm->sessions, value0.value);
1084 b0->flags |= VNET_BUFFER_F_IS_NATED;
1086 if (!is_output_feature)
1087 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1089 old_addr0 = ip0->src_address.as_u32;
1090 new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1091 sum0 = ip0->checksum;
1092 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1094 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1095 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1096 s0->ext_host_addr.as_u32, ip4_header_t,
1098 ip0->checksum = ip_csum_fold (sum0);
1100 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1102 old_port0 = tcp0->src_port;
1103 new_port0 = tcp0->src_port = s0->out2in.port;
1105 sum0 = tcp0->checksum;
1106 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1108 sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1110 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1112 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1113 s0->ext_host_addr.as_u32,
1114 ip4_header_t, dst_address);
1115 sum0 = ip_csum_update (sum0, tcp0->dst_port,
1116 s0->ext_host_port, ip4_header_t,
1118 tcp0->dst_port = s0->ext_host_port;
1119 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1121 mss_clamping (sm, tcp0, &sum0);
1122 tcp0->checksum = ip_csum_fold (sum0);
1123 if (nat44_set_tcp_session_state_i2o
1124 (sm, s0, tcp0, thread_index))
1129 udp0->src_port = s0->out2in.port;
1131 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1133 udp0->dst_port = s0->ext_host_port;
1134 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1139 nat44_session_update_counters (s0, now,
1140 vlib_buffer_length_in_chain (vm,
1142 /* Per-user LRU list maintenance */
1143 nat44_session_update_lru (sm, s0, thread_index);
1146 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1147 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1149 nat_in2out_ed_trace_t *t =
1150 vlib_add_trace (vm, node, b0, sizeof (*t));
1151 t->is_slow_path = is_slow_path;
1152 t->sw_if_index = sw_if_index0;
1153 t->next_index = next0;
1154 t->session_index = ~0;
1156 t->session_index = s0 - tsm->sessions;
1159 pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP;
1162 next1 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1164 if (is_output_feature)
1165 iph_offset1 = vnet_buffer (b1)->ip.save_rewrite_length;
1167 ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
1170 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
1172 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1175 if (PREDICT_FALSE (ip1->ttl == 1))
1177 vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1178 icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
1179 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1181 next1 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
1185 udp1 = ip4_next_header (ip1);
1186 tcp1 = (tcp_header_t *) udp1;
1187 icmp1 = (icmp46_header_t *) udp1;
1188 proto1 = ip_proto_to_snat_proto (ip1->protocol);
1192 if (PREDICT_FALSE (proto1 == ~0))
1194 s1 = nat44_ed_in2out_unknown_proto (sm, b1, ip1,
1196 thread_index, now, vm,
1199 next1 = NAT_IN2OUT_ED_NEXT_DROP;
1203 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1205 next1 = icmp_in2out_ed_slow_path
1206 (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
1207 next1, now, thread_index, &s1);
1213 if (PREDICT_FALSE (proto1 == ~0))
1215 next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1219 if (ip4_is_fragment (ip1))
1221 next1 = NAT_IN2OUT_ED_NEXT_REASS;
1225 if (is_output_feature)
1228 (nat_not_translate_output_feature_fwd
1229 (sm, ip1, thread_index, now, vm, b1)))
1233 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1235 next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1240 make_ed_kv (&kv1, &ip1->src_address, &ip1->dst_address,
1241 ip1->protocol, rx_fib_index1, udp1->src_port,
1244 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv1, &value1))
1248 if (is_output_feature)
1251 (nat44_ed_not_translate_output_feature
1252 (sm, ip1, ip1->protocol, udp1->src_port,
1253 udp1->dst_port, thread_index, sw_if_index1,
1254 vnet_buffer (b1)->sw_if_index[VLIB_TX])))
1259 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1268 slow_path_ed (sm, b1, rx_fib_index1, &kv1, &s1, node,
1269 next1, thread_index, now, tcp1);
1271 if (PREDICT_FALSE (next1 == NAT_IN2OUT_ED_NEXT_DROP))
1274 if (PREDICT_FALSE (!s1))
1279 next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1285 s1 = pool_elt_at_index (tsm->sessions, value1.value);
1288 b1->flags |= VNET_BUFFER_F_IS_NATED;
1290 if (!is_output_feature)
1291 vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
1293 old_addr1 = ip1->src_address.as_u32;
1294 new_addr1 = ip1->src_address.as_u32 = s1->out2in.addr.as_u32;
1295 sum1 = ip1->checksum;
1296 sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1298 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1299 sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1300 s1->ext_host_addr.as_u32, ip4_header_t,
1302 ip1->checksum = ip_csum_fold (sum1);
1304 if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1306 old_port1 = tcp1->src_port;
1307 new_port1 = tcp1->src_port = s1->out2in.port;
1309 sum1 = tcp1->checksum;
1310 sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1312 sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t,
1314 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1316 sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1317 s1->ext_host_addr.as_u32,
1318 ip4_header_t, dst_address);
1319 sum1 = ip_csum_update (sum1, tcp1->dst_port,
1320 s1->ext_host_port, ip4_header_t,
1322 tcp1->dst_port = s1->ext_host_port;
1323 ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1325 tcp1->checksum = ip_csum_fold (sum1);
1326 mss_clamping (sm, tcp1, &sum1);
1327 if (nat44_set_tcp_session_state_i2o
1328 (sm, s1, tcp1, thread_index))
1333 udp1->src_port = s1->out2in.port;
1335 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1337 udp1->dst_port = s1->ext_host_port;
1338 ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1343 nat44_session_update_counters (s1, now,
1344 vlib_buffer_length_in_chain (vm,
1346 /* Per-user LRU list maintenance */
1347 nat44_session_update_lru (sm, s1, thread_index);
1350 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1351 && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1353 nat_in2out_ed_trace_t *t =
1354 vlib_add_trace (vm, node, b1, sizeof (*t));
1355 t->is_slow_path = is_slow_path;
1356 t->sw_if_index = sw_if_index1;
1357 t->next_index = next1;
1358 t->session_index = ~0;
1360 t->session_index = s1 - tsm->sessions;
1363 pkts_processed += next1 != NAT_IN2OUT_ED_NEXT_DROP;
1365 /* verify speculative enqueues, maybe switch current next frame */
1366 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1367 to_next, n_left_to_next,
1368 bi0, bi1, next0, next1);
1371 while (n_left_from > 0 && n_left_to_next > 0)
1375 u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
1376 new_addr0, old_addr0;
1377 u16 old_port0, new_port0;
1381 icmp46_header_t *icmp0;
1382 snat_session_t *s0 = 0;
1383 clib_bihash_kv_16_8_t kv0, value0;
1386 /* speculatively enqueue b0 to the current next frame */
1392 n_left_to_next -= 1;
1394 b0 = vlib_get_buffer (vm, bi0);
1395 next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1397 if (is_output_feature)
1398 iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1400 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1403 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1405 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1408 if (PREDICT_FALSE (ip0->ttl == 1))
1410 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1411 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1412 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1414 next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
1418 udp0 = ip4_next_header (ip0);
1419 tcp0 = (tcp_header_t *) udp0;
1420 icmp0 = (icmp46_header_t *) udp0;
1421 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1425 if (PREDICT_FALSE (proto0 == ~0))
1427 s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
1429 thread_index, now, vm,
1432 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1436 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1438 next0 = icmp_in2out_ed_slow_path
1439 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1440 next0, now, thread_index, &s0);
1446 if (PREDICT_FALSE (proto0 == ~0))
1448 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1452 if (ip4_is_fragment (ip0))
1454 next0 = NAT_IN2OUT_ED_NEXT_REASS;
1458 if (is_output_feature)
1461 (nat_not_translate_output_feature_fwd
1462 (sm, ip0, thread_index, now, vm, b0)))
1466 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1468 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1473 make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1474 ip0->protocol, rx_fib_index0, udp0->src_port,
1477 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1481 if (is_output_feature)
1484 (nat44_ed_not_translate_output_feature
1485 (sm, ip0, ip0->protocol, udp0->src_port,
1486 udp0->dst_port, thread_index, sw_if_index0,
1487 vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1492 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1501 slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1502 next0, thread_index, now, tcp0);
1504 if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1507 if (PREDICT_FALSE (!s0))
1512 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1518 s0 = pool_elt_at_index (tsm->sessions, value0.value);
1521 b0->flags |= VNET_BUFFER_F_IS_NATED;
1523 if (!is_output_feature)
1524 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1526 old_addr0 = ip0->src_address.as_u32;
1527 new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1528 sum0 = ip0->checksum;
1529 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1531 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1532 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1533 s0->ext_host_addr.as_u32, ip4_header_t,
1535 ip0->checksum = ip_csum_fold (sum0);
1537 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1539 old_port0 = tcp0->src_port;
1540 new_port0 = tcp0->src_port = s0->out2in.port;
1542 sum0 = tcp0->checksum;
1543 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1545 sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1547 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1549 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1550 s0->ext_host_addr.as_u32,
1551 ip4_header_t, dst_address);
1552 sum0 = ip_csum_update (sum0, tcp0->dst_port,
1553 s0->ext_host_port, ip4_header_t,
1555 tcp0->dst_port = s0->ext_host_port;
1556 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1558 mss_clamping (sm, tcp0, &sum0);
1559 tcp0->checksum = ip_csum_fold (sum0);
1560 if (nat44_set_tcp_session_state_i2o
1561 (sm, s0, tcp0, thread_index))
1566 udp0->src_port = s0->out2in.port;
1568 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1570 udp0->dst_port = s0->ext_host_port;
1571 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1576 nat44_session_update_counters (s0, now,
1577 vlib_buffer_length_in_chain (vm,
1579 /* Per-user LRU list maintenance */
1580 nat44_session_update_lru (sm, s0, thread_index);
1583 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1584 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1586 nat_in2out_ed_trace_t *t =
1587 vlib_add_trace (vm, node, b0, sizeof (*t));
1588 t->is_slow_path = is_slow_path;
1589 t->sw_if_index = sw_if_index0;
1590 t->next_index = next0;
1591 t->session_index = ~0;
1593 t->session_index = s0 - tsm->sessions;
1596 pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP;
1598 /* verify speculative enqueue, maybe switch current next frame */
1599 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1600 to_next, n_left_to_next,
1604 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1607 vlib_node_increment_counter (vm, stats_node_index,
1608 NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
1610 return frame->n_vectors;
1614 nat44_ed_in2out_fast_path_fn (vlib_main_t * vm,
1615 vlib_node_runtime_t * node,
1616 vlib_frame_t * frame)
1618 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 0);
1622 VLIB_REGISTER_NODE (nat44_ed_in2out_node) = {
1623 .function = nat44_ed_in2out_fast_path_fn,
1624 .name = "nat44-ed-in2out",
1625 .vector_size = sizeof (u32),
1626 .format_trace = format_nat_in2out_ed_trace,
1627 .type = VLIB_NODE_TYPE_INTERNAL,
1628 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1629 .error_strings = nat_in2out_ed_error_strings,
1630 .runtime_data_bytes = sizeof (snat_runtime_t),
1631 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1633 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1634 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
1635 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath",
1636 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1637 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1642 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_node,
1643 nat44_ed_in2out_fast_path_fn);
1646 nat44_ed_in2out_output_fast_path_fn (vlib_main_t * vm,
1647 vlib_node_runtime_t * node,
1648 vlib_frame_t * frame)
1650 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 1);
1654 VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = {
1655 .function = nat44_ed_in2out_output_fast_path_fn,
1656 .name = "nat44-ed-in2out-output",
1657 .vector_size = sizeof (u32),
1658 .format_trace = format_nat_in2out_ed_trace,
1659 .type = VLIB_NODE_TYPE_INTERNAL,
1660 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1661 .error_strings = nat_in2out_ed_error_strings,
1662 .runtime_data_bytes = sizeof (snat_runtime_t),
1663 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1665 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1666 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
1667 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath",
1668 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1669 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass-output",
1674 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_node,
1675 nat44_ed_in2out_output_fast_path_fn);
1678 nat44_ed_in2out_slow_path_fn (vlib_main_t * vm,
1679 vlib_node_runtime_t * node,
1680 vlib_frame_t * frame)
1682 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 0);
1686 VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = {
1687 .function = nat44_ed_in2out_slow_path_fn,
1688 .name = "nat44-ed-in2out-slowpath",
1689 .vector_size = sizeof (u32),
1690 .format_trace = format_nat_in2out_ed_trace,
1691 .type = VLIB_NODE_TYPE_INTERNAL,
1692 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1693 .error_strings = nat_in2out_ed_error_strings,
1694 .runtime_data_bytes = sizeof (snat_runtime_t),
1695 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1697 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1698 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
1699 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath",
1700 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1701 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1706 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_slowpath_node,
1707 nat44_ed_in2out_slow_path_fn);
1710 nat44_ed_in2out_output_slow_path_fn (vlib_main_t * vm,
1711 vlib_node_runtime_t * node,
1712 vlib_frame_t * frame)
1714 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 1);
1718 VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = {
1719 .function = nat44_ed_in2out_output_slow_path_fn,
1720 .name = "nat44-ed-in2out-output-slowpath",
1721 .vector_size = sizeof (u32),
1722 .format_trace = format_nat_in2out_ed_trace,
1723 .type = VLIB_NODE_TYPE_INTERNAL,
1724 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1725 .error_strings = nat_in2out_ed_error_strings,
1726 .runtime_data_bytes = sizeof (snat_runtime_t),
1727 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1729 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1730 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
1731 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath",
1732 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1733 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1738 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_slowpath_node,
1739 nat44_ed_in2out_output_slow_path_fn);
1742 nat44_ed_in2out_reass_node_fn_inline (vlib_main_t * vm,
1743 vlib_node_runtime_t * node,
1744 vlib_frame_t * frame,
1745 int is_output_feature)
1747 u32 n_left_from, *from, *to_next;
1748 nat_in2out_ed_next_t next_index;
1749 u32 pkts_processed = 0;
1750 snat_main_t *sm = &snat_main;
1751 f64 now = vlib_time_now (vm);
1752 u32 thread_index = vm->thread_index;
1753 snat_main_per_thread_data_t *per_thread_data =
1754 &sm->per_thread_data[thread_index];
1755 u32 *fragments_to_drop = 0;
1756 u32 *fragments_to_loopback = 0;
1758 from = vlib_frame_vector_args (frame);
1759 n_left_from = frame->n_vectors;
1760 next_index = node->cached_next_index;
1762 while (n_left_from > 0)
1766 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1768 while (n_left_from > 0 && n_left_to_next > 0)
1770 u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
1771 u32 iph_offset0 = 0;
1775 ip4_header_t *ip0 = 0;
1776 nat_reass_ip4_t *reass0;
1779 icmp46_header_t *icmp0;
1780 clib_bihash_kv_16_8_t kv0, value0;
1781 snat_session_t *s0 = 0;
1782 u16 old_port0, new_port0;
1785 /* speculatively enqueue b0 to the current next frame */
1791 n_left_to_next -= 1;
1793 b0 = vlib_get_buffer (vm, bi0);
1795 next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1797 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1799 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1802 if (PREDICT_FALSE (nat_reass_is_drop_frag (0)))
1804 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1805 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT];
1809 if (is_output_feature)
1810 iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1812 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1815 udp0 = ip4_next_header (ip0);
1816 tcp0 = (tcp_header_t *) udp0;
1817 icmp0 = (icmp46_header_t *) udp0;
1818 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1820 reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
1824 1, &fragments_to_drop);
1826 if (PREDICT_FALSE (!reass0))
1828 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1829 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_REASS];
1830 nat_log_notice ("maximum reassemblies exceeded");
1834 if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1836 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1838 if (is_output_feature)
1841 (nat_not_translate_output_feature_fwd
1842 (sm, ip0, thread_index, now, vm, b0)))
1843 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1847 next0 = icmp_in2out_ed_slow_path
1848 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1849 next0, now, thread_index, &s0);
1851 if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP))
1854 reass0->sess_index = s0 - per_thread_data->sessions;
1856 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1857 nat_ip4_reass_get_frags (reass0,
1858 &fragments_to_loopback);
1864 make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1865 ip0->protocol, rx_fib_index0, udp0->src_port,
1868 if (clib_bihash_search_16_8
1869 (&per_thread_data->in2out_ed, &kv0, &value0))
1871 if (is_output_feature)
1874 (nat44_ed_not_translate_output_feature
1875 (sm, ip0, ip0->protocol, udp0->src_port,
1876 udp0->dst_port, thread_index, sw_if_index0,
1877 vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1879 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1880 nat_ip4_reass_get_frags (reass0,
1881 &fragments_to_loopback);
1887 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1893 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1894 nat_ip4_reass_get_frags (reass0,
1895 &fragments_to_loopback);
1900 next0 = slow_path_ed (sm, b0, rx_fib_index0, &kv0,
1901 &s0, node, next0, thread_index, now,
1904 if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1907 if (PREDICT_FALSE (!s0))
1909 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1913 reass0->sess_index = s0 - per_thread_data->sessions;
1917 s0 = pool_elt_at_index (per_thread_data->sessions,
1919 reass0->sess_index = value0.value;
1921 nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
1925 if (reass0->flags & NAT_REASS_FLAG_ED_DONT_TRANSLATE)
1927 if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
1929 if (nat_ip4_reass_add_fragment
1930 (reass0, bi0, &fragments_to_drop))
1932 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_FRAG];
1934 ("maximum fragments per reassembly exceeded");
1935 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1941 s0 = pool_elt_at_index (per_thread_data->sessions,
1942 reass0->sess_index);
1945 old_addr0 = ip0->src_address.as_u32;
1946 ip0->src_address = s0->out2in.addr;
1947 new_addr0 = ip0->src_address.as_u32;
1948 if (!is_output_feature)
1949 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1951 sum0 = ip0->checksum;
1952 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1954 src_address /* changed member */ );
1955 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1956 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1957 s0->ext_host_addr.as_u32, ip4_header_t,
1959 ip0->checksum = ip_csum_fold (sum0);
1961 if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1963 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1965 old_port0 = tcp0->src_port;
1966 tcp0->src_port = s0->out2in.port;
1967 new_port0 = tcp0->src_port;
1969 sum0 = tcp0->checksum;
1970 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1972 dst_address /* changed member */ );
1973 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1974 ip4_header_t /* cheat */ ,
1975 length /* changed member */ );
1976 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1978 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1979 s0->ext_host_addr.as_u32,
1980 ip4_header_t, dst_address);
1981 sum0 = ip_csum_update (sum0, tcp0->dst_port,
1982 s0->ext_host_port, ip4_header_t,
1984 tcp0->dst_port = s0->ext_host_port;
1985 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1987 tcp0->checksum = ip_csum_fold (sum0);
1991 old_port0 = udp0->src_port;
1992 udp0->src_port = s0->out2in.port;
1994 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1996 udp0->dst_port = s0->ext_host_port;
1997 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
2003 nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port,
2004 s0->ext_host_port, proto0, 1);
2007 nat44_session_update_counters (s0, now,
2008 vlib_buffer_length_in_chain (vm,
2010 /* Per-user LRU list maintenance */
2011 nat44_session_update_lru (sm, s0, thread_index);
2014 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
2015 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
2017 nat44_reass_trace_t *t =
2018 vlib_add_trace (vm, node, b0, sizeof (*t));
2019 t->cached = cached0;
2020 t->sw_if_index = sw_if_index0;
2021 t->next_index = next0;
2031 pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP;
2033 /* verify speculative enqueue, maybe switch current next frame */
2034 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2035 to_next, n_left_to_next,
2039 if (n_left_from == 0 && vec_len (fragments_to_loopback))
2041 from = vlib_frame_vector_args (frame);
2042 u32 len = vec_len (fragments_to_loopback);
2043 if (len <= VLIB_FRAME_SIZE)
2045 clib_memcpy_fast (from, fragments_to_loopback,
2046 sizeof (u32) * len);
2048 vec_reset_length (fragments_to_loopback);
2052 clib_memcpy_fast (from, fragments_to_loopback +
2053 (len - VLIB_FRAME_SIZE),
2054 sizeof (u32) * VLIB_FRAME_SIZE);
2055 n_left_from = VLIB_FRAME_SIZE;
2056 _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
2061 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2064 vlib_node_increment_counter (vm, nat44_ed_in2out_reass_node.index,
2065 NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
2068 nat_send_all_to_node (vm, fragments_to_drop, node,
2069 &node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT],
2070 NAT_IN2OUT_ED_NEXT_DROP);
2072 vec_free (fragments_to_drop);
2073 vec_free (fragments_to_loopback);
2074 return frame->n_vectors;
2078 nat44_ed_in2out_reass_node_fn (vlib_main_t * vm,
2079 vlib_node_runtime_t * node,
2080 vlib_frame_t * frame)
2082 return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 0);
2086 VLIB_REGISTER_NODE (nat44_ed_in2out_reass_node) = {
2087 .function = nat44_ed_in2out_reass_node_fn,
2088 .name = "nat44-ed-in2out-reass",
2089 .vector_size = sizeof (u32),
2090 .format_trace = format_nat44_reass_trace,
2091 .type = VLIB_NODE_TYPE_INTERNAL,
2092 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2093 .error_strings = nat_in2out_ed_error_strings,
2094 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
2096 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
2097 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
2098 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
2099 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2100 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
2105 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_node,
2106 nat44_ed_in2out_reass_node_fn);
2109 nat44_ed_in2out_reass_output_node_fn (vlib_main_t * vm,
2110 vlib_node_runtime_t * node,
2111 vlib_frame_t * frame)
2113 return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 1);
2117 VLIB_REGISTER_NODE (nat44_ed_in2out_reass_output_node) = {
2118 .function = nat44_ed_in2out_reass_output_node_fn,
2119 .name = "nat44-ed-in2out-reass-output",
2120 .vector_size = sizeof (u32),
2121 .format_trace = format_nat44_reass_trace,
2122 .type = VLIB_NODE_TYPE_INTERNAL,
2123 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2124 .error_strings = nat_in2out_ed_error_strings,
2125 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
2127 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
2128 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
2129 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
2130 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2131 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
2136 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_output_node,
2137 nat44_ed_in2out_reass_output_node_fn);
2140 * fd.io coding-style-patch-verification: ON
2143 * eval: (c-set-style "gnu")