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 (s->in2out.addr.as_u32,
203 s->out2in.addr.as_u32,
207 s->in2out.fib_index);
209 nat_syslog_nat44_sdel (s->user_index, s->in2out.fib_index,
210 &s->in2out.addr, s->in2out.port,
211 &s->ext_host_nat_addr, s->ext_host_nat_port,
212 &s->out2in.addr, s->out2in.port,
213 &s->ext_host_addr, s->ext_host_port,
214 s->in2out.protocol, is_twice_nat_session (s));
216 if (is_twice_nat_session (s))
218 for (i = 0; i < vec_len (sm->twice_nat_addresses); i++)
220 key.protocol = s->in2out.protocol;
221 key.port = s->ext_host_nat_port;
222 a = sm->twice_nat_addresses + i;
223 if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
225 snat_free_outside_address_and_port (sm->twice_nat_addresses,
233 if (snat_is_session_static (s))
236 snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
239 nat44_delete_session (sm, s, ctx->thread_index);
247 icmp_in2out_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
248 ip4_header_t * ip0, icmp46_header_t * icmp0,
249 u32 sw_if_index0, u32 rx_fib_index0,
250 vlib_node_runtime_t * node, u32 next0, f64 now,
251 u32 thread_index, snat_session_t ** p_s0)
253 next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
254 next0, thread_index, p_s0, 0);
255 snat_session_t *s0 = *p_s0;
256 if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP && s0))
259 nat44_session_update_counters (s0, now,
260 vlib_buffer_length_in_chain
261 (sm->vlib_main, b0));
262 /* Per-user LRU list maintenance */
263 nat44_session_update_lru (sm, s0, thread_index);
269 slow_path_ed (snat_main_t * sm,
272 clib_bihash_kv_16_8_t * kv,
273 snat_session_t ** sessionp,
274 vlib_node_runtime_t * node, u32 next, u32 thread_index, f64 now,
277 snat_session_t *s = 0;
279 snat_session_key_t key0, key1;
280 lb_nat_type_t lb = 0, is_sm = 0;
281 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
282 nat_ed_ses_key_t *key = (nat_ed_ses_key_t *) kv->key;
283 u32 proto = ip_proto_to_snat_proto (key->proto);
284 nat_outside_fib_t *outside_fib;
285 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
288 .fp_proto = FIB_PROTOCOL_IP4,
291 .ip4.as_u32 = key->r_addr.as_u32,
294 nat44_is_idle_session_ctx_t ctx;
296 if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
298 b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
299 nat_ipfix_logging_max_sessions (sm->max_translations);
300 nat_log_notice ("maximum sessions exceeded");
301 return NAT_IN2OUT_ED_NEXT_DROP;
304 key0.addr = key->l_addr;
305 key0.port = key->l_port;
306 key1.protocol = key0.protocol = proto;
307 key0.fib_index = rx_fib_index;
308 key1.fib_index = sm->outside_fib_index;
309 /* First try to match static mapping by local address and port */
310 if (snat_static_mapping_match
311 (sm, key0, &key1, 0, 0, 0, &lb, 0, &identity_nat))
313 /* Try to create dynamic translation */
314 if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index,
317 tsm->snat_thread_index))
319 nat_log_notice ("addresses exhausted");
320 b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS];
321 return NAT_IN2OUT_ED_NEXT_DROP;
326 if (PREDICT_FALSE (identity_nat))
335 if (proto == SNAT_PROTOCOL_TCP)
337 if (!tcp_is_init (tcp))
339 b->error = node->errors[NAT_IN2OUT_ED_ERROR_NON_SYN];
340 return NAT_IN2OUT_ED_NEXT_DROP;
344 u = nat_user_get_or_create (sm, &key->l_addr, rx_fib_index, thread_index);
347 nat_log_warn ("create NAT user failed");
349 snat_free_outside_address_and_port (sm->addresses,
350 thread_index, &key1);
351 return NAT_IN2OUT_ED_NEXT_DROP;
354 s = nat_ed_session_alloc (sm, u, thread_index, now);
357 nat44_delete_user_with_no_session (sm, u, thread_index);
358 nat_log_warn ("create NAT session failed");
360 snat_free_outside_address_and_port (sm->addresses,
361 thread_index, &key1);
362 return NAT_IN2OUT_ED_NEXT_DROP;
365 user_session_increment (sm, u, is_sm);
367 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
369 s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
370 s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
371 s->ext_host_addr = key->r_addr;
372 s->ext_host_port = key->r_port;
375 s->out2in.protocol = key0.protocol;
377 switch (vec_len (sm->outside_fibs))
380 s->out2in.fib_index = sm->outside_fib_index;
383 s->out2in.fib_index = sm->outside_fibs[0].fib_index;
387 vec_foreach (outside_fib, sm->outside_fibs)
389 fei = fib_table_lookup (outside_fib->fib_index, &pfx);
390 if (FIB_NODE_INDEX_INVALID != fei)
392 if (fib_entry_get_resolving_interface (fei) != ~0)
394 s->out2in.fib_index = outside_fib->fib_index;
403 /* Add to lookup tables */
404 kv->value = s - tsm->sessions;
406 ctx.thread_index = thread_index;
407 if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, kv,
408 nat44_i2o_ed_is_idle_session_cb,
410 nat_log_notice ("in2out-ed key add failed");
412 make_ed_kv (kv, &key1.addr, &key->r_addr, key->proto, s->out2in.fib_index,
413 key1.port, key->r_port);
414 kv->value = s - tsm->sessions;
415 if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, kv,
416 nat44_o2i_ed_is_idle_session_cb,
418 nat_log_notice ("out2in-ed key add failed");
423 snat_ipfix_logging_nat44_ses_create (s->in2out.addr.as_u32,
424 s->out2in.addr.as_u32,
427 s->out2in.port, s->in2out.fib_index);
429 nat_syslog_nat44_sadd (s->user_index, s->in2out.fib_index,
430 &s->in2out.addr, s->in2out.port,
431 &s->ext_host_nat_addr, s->ext_host_nat_port,
432 &s->out2in.addr, s->out2in.port,
433 &s->ext_host_addr, s->ext_host_port,
434 s->in2out.protocol, 0);
439 static_always_inline int
440 nat44_ed_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
441 u32 sw_if_index, ip4_header_t * ip, u32 proto,
442 u32 rx_fib_index, u32 thread_index)
444 udp_header_t *udp = ip4_next_header (ip);
445 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
446 clib_bihash_kv_16_8_t kv, value;
447 snat_session_key_t key0, key1;
449 make_ed_kv (&kv, &ip->dst_address, &ip->src_address, ip->protocol,
450 sm->outside_fib_index, udp->dst_port, udp->src_port);
452 /* NAT packet aimed at external address if */
453 /* has active sessions */
454 if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
456 key0.addr = ip->dst_address;
457 key0.port = udp->dst_port;
458 key0.protocol = proto;
459 key0.fib_index = sm->outside_fib_index;
460 /* or is static mappings */
461 if (!snat_static_mapping_match (sm, key0, &key1, 1, 0, 0, 0, 0, 0))
467 if (sm->forwarding_enabled)
470 return snat_not_translate_fast (sm, node, sw_if_index, ip, proto,
474 static_always_inline int
475 nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip,
476 u32 thread_index, f64 now,
477 vlib_main_t * vm, vlib_buffer_t * b)
479 nat_ed_ses_key_t key;
480 clib_bihash_kv_16_8_t kv, value;
482 snat_session_t *s = 0;
483 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
485 if (!sm->forwarding_enabled)
488 if (ip->protocol == IP_PROTOCOL_ICMP)
490 key.as_u64[0] = key.as_u64[1] = 0;
491 if (icmp_get_ed_key (ip, &key))
494 kv.key[0] = key.as_u64[0];
495 kv.key[1] = key.as_u64[1];
497 else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP)
499 udp = ip4_next_header (ip);
500 make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0,
501 udp->src_port, udp->dst_port);
505 make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0, 0,
509 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
511 s = pool_elt_at_index (tsm->sessions, value.value);
512 if (is_fwd_bypass_session (s))
514 if (ip->protocol == IP_PROTOCOL_TCP)
516 tcp_header_t *tcp = ip4_next_header (ip);
517 if (nat44_set_tcp_session_state_i2o (sm, s, tcp, thread_index))
521 nat44_session_update_counters (s, now,
522 vlib_buffer_length_in_chain (vm, b));
523 /* Per-user LRU list maintenance */
524 nat44_session_update_lru (sm, s, thread_index);
534 static_always_inline int
535 nat44_ed_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip,
536 u8 proto, u16 src_port, u16 dst_port,
537 u32 thread_index, u32 rx_sw_if_index,
540 clib_bihash_kv_16_8_t kv, value;
541 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
544 u32 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (rx_sw_if_index);
545 u32 tx_fib_index = ip4_fib_table_get_index_for_sw_if_index (tx_sw_if_index);
548 make_ed_kv (&kv, &ip->src_address, &ip->dst_address, proto, tx_fib_index,
550 if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
552 s = pool_elt_at_index (tsm->sessions, value.value);
553 if (nat44_is_ses_closed (s))
555 nat_log_debug ("TCP close connection %U", format_snat_session,
556 &sm->per_thread_data[thread_index], s);
557 nat_free_session_data (sm, s, thread_index);
558 nat44_delete_session (sm, s, thread_index);
561 s->flags |= SNAT_SESSION_FLAG_OUTPUT_FEATURE;
566 make_ed_kv (&kv, &ip->dst_address, &ip->src_address, proto, rx_fib_index,
568 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
570 s = pool_elt_at_index (tsm->sessions, value.value);
571 if (is_fwd_bypass_session (s))
576 pool_foreach (i, sm->output_feature_interfaces,
578 if ((nat_interface_is_inside (i)) && (rx_sw_if_index == i->sw_if_index))
589 icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node,
590 u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip,
591 u8 * p_proto, snat_session_key_t * p_value,
592 u8 * p_dont_translate, void *d, void *e)
594 icmp46_header_t *icmp;
597 nat_ed_ses_key_t key;
598 snat_session_t *s = 0;
599 u8 dont_translate = 0;
600 clib_bihash_kv_16_8_t kv, value;
603 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
605 icmp = (icmp46_header_t *) ip4_next_header (ip);
606 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
607 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
609 key.as_u64[0] = key.as_u64[1] = 0;
610 err = icmp_get_ed_key (ip, &key);
613 b->error = node->errors[err];
614 next = NAT_IN2OUT_ED_NEXT_DROP;
617 key.fib_index = rx_fib_index;
619 kv.key[0] = key.as_u64[0];
620 kv.key[1] = key.as_u64[1];
622 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
624 if (vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0)
626 if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (sm, ip,
645 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index,
646 ip, SNAT_PROTOCOL_ICMP,
655 if (PREDICT_FALSE (icmp_is_error_message (icmp)))
657 b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
658 next = NAT_IN2OUT_ED_NEXT_DROP;
662 next = slow_path_ed (sm, b, rx_fib_index, &kv, &s, node, next,
663 thread_index, vlib_time_now (sm->vlib_main), 0);
665 if (PREDICT_FALSE (next == NAT_IN2OUT_ED_NEXT_DROP))
676 if (PREDICT_FALSE (icmp->type != ICMP4_echo_request &&
677 icmp->type != ICMP4_echo_reply &&
678 !icmp_is_error_message (icmp)))
680 b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE];
681 next = NAT_IN2OUT_ED_NEXT_DROP;
685 s = pool_elt_at_index (tsm->sessions, value.value);
688 *p_proto = ip_proto_to_snat_proto (key.proto);
691 *p_value = s->out2in;
692 *p_dont_translate = dont_translate;
694 *(snat_session_t **) d = s;
698 static snat_session_t *
699 nat44_ed_in2out_unknown_proto (snat_main_t * sm,
705 vlib_main_t * vm, vlib_node_runtime_t * node)
707 clib_bihash_kv_8_8_t kv, value;
708 clib_bihash_kv_16_8_t s_kv, s_value;
709 snat_static_mapping_t *m;
710 u32 old_addr, new_addr = 0;
713 dlist_elt_t *head, *elt;
714 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
715 u32 elt_index, head_index, ses_index;
717 u32 outside_fib_index = sm->outside_fib_index;
720 nat_outside_fib_t *outside_fib;
721 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
723 .fp_proto = FIB_PROTOCOL_IP4,
726 .ip4.as_u32 = ip->dst_address.as_u32,
730 switch (vec_len (sm->outside_fibs))
733 outside_fib_index = sm->outside_fib_index;
736 outside_fib_index = sm->outside_fibs[0].fib_index;
740 vec_foreach (outside_fib, sm->outside_fibs)
742 fei = fib_table_lookup (outside_fib->fib_index, &pfx);
743 if (FIB_NODE_INDEX_INVALID != fei)
745 if (fib_entry_get_resolving_interface (fei) != ~0)
747 outside_fib_index = outside_fib->fib_index;
755 old_addr = ip->src_address.as_u32;
757 make_ed_kv (&s_kv, &ip->src_address, &ip->dst_address, ip->protocol,
760 if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &s_kv, &s_value))
762 s = pool_elt_at_index (tsm->sessions, s_value.value);
763 new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
767 if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
769 b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED];
770 nat_ipfix_logging_max_sessions (sm->max_translations);
771 nat_log_notice ("maximum sessions exceeded");
775 u = nat_user_get_or_create (sm, &ip->src_address, rx_fib_index,
779 nat_log_warn ("create NAT user failed");
783 make_sm_kv (&kv, &ip->src_address, 0, rx_fib_index, 0);
785 /* Try to find static mapping first */
786 if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
788 m = pool_elt_at_index (sm->static_mappings, value.value);
789 new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
793 /* Fallback to 3-tuple key */
796 /* Choose same out address as for TCP/UDP session to same destination */
797 head_index = u->sessions_per_user_list_head_index;
798 head = pool_elt_at_index (tsm->list_pool, head_index);
799 elt_index = head->next;
800 if (PREDICT_FALSE (elt_index == ~0))
804 elt = pool_elt_at_index (tsm->list_pool, elt_index);
805 ses_index = elt->value;
808 while (ses_index != ~0)
810 s = pool_elt_at_index (tsm->sessions, ses_index);
811 elt_index = elt->next;
812 elt = pool_elt_at_index (tsm->list_pool, elt_index);
813 ses_index = elt->value;
815 if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
817 new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32;
819 make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address,
820 ip->protocol, outside_fib_index, 0, 0);
821 if (clib_bihash_search_16_8
822 (&tsm->out2in_ed, &s_kv, &s_value))
829 for (i = 0; i < vec_len (sm->addresses); i++)
831 make_ed_kv (&s_kv, &sm->addresses[i].addr, &ip->dst_address,
832 ip->protocol, outside_fib_index, 0, 0);
833 if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
835 new_addr = ip->src_address.as_u32 =
836 sm->addresses[i].addr.as_u32;
844 s = nat_ed_session_alloc (sm, u, thread_index, now);
847 nat44_delete_user_with_no_session (sm, u, thread_index);
848 nat_log_warn ("create NAT session failed");
852 s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
853 s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
854 s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
855 s->out2in.addr.as_u32 = new_addr;
856 s->out2in.fib_index = outside_fib_index;
857 s->in2out.addr.as_u32 = old_addr;
858 s->in2out.fib_index = rx_fib_index;
859 s->in2out.port = s->out2in.port = ip->protocol;
861 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
862 user_session_increment (sm, u, is_sm);
864 /* Add to lookup tables */
865 make_ed_kv (&s_kv, &s->in2out.addr, &ip->dst_address, ip->protocol,
867 s_kv.value = s - tsm->sessions;
868 if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1))
869 nat_log_notice ("in2out key add failed");
871 make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address, ip->protocol,
872 outside_fib_index, 0, 0);
873 s_kv.value = s - tsm->sessions;
874 if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1))
875 nat_log_notice ("out2in key add failed");
878 /* Update IP checksum */
880 sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
881 ip->checksum = ip_csum_fold (sum);
884 nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b));
885 /* Per-user LRU list maintenance */
886 nat44_session_update_lru (sm, s, thread_index);
889 if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
890 nat44_ed_hairpinning_unknown_proto (sm, b, ip);
892 if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
893 vnet_buffer (b)->sw_if_index[VLIB_TX] = outside_fib_index;
899 nat44_ed_in2out_node_fn_inline (vlib_main_t * vm,
900 vlib_node_runtime_t * node,
901 vlib_frame_t * frame, int is_slow_path,
902 int is_output_feature)
904 u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
905 nat_in2out_ed_next_t next_index;
906 snat_main_t *sm = &snat_main;
907 f64 now = vlib_time_now (vm);
908 u32 thread_index = vm->thread_index;
909 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
910 u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
913 stats_node_index = is_slow_path ? nat44_ed_in2out_slowpath_node.index :
914 nat44_ed_in2out_node.index;
916 from = vlib_frame_vector_args (frame);
917 n_left_from = frame->n_vectors;
918 next_index = node->cached_next_index;
920 while (n_left_from > 0)
924 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
926 while (n_left_from >= 4 && n_left_to_next >= 2)
929 vlib_buffer_t *b0, *b1;
930 u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
931 new_addr0, old_addr0;
932 u32 next1, sw_if_index1, rx_fib_index1, iph_offset1 = 0, proto1,
933 new_addr1, old_addr1;
934 u16 old_port0, new_port0, old_port1, new_port1;
935 ip4_header_t *ip0, *ip1;
936 udp_header_t *udp0, *udp1;
937 tcp_header_t *tcp0, *tcp1;
938 icmp46_header_t *icmp0, *icmp1;
939 snat_session_t *s0 = 0, *s1 = 0;
940 clib_bihash_kv_16_8_t kv0, value0, kv1, value1;
941 ip_csum_t sum0, sum1;
943 /* Prefetch next iteration. */
945 vlib_buffer_t *p2, *p3;
947 p2 = vlib_get_buffer (vm, from[2]);
948 p3 = vlib_get_buffer (vm, from[3]);
950 vlib_prefetch_buffer_header (p2, LOAD);
951 vlib_prefetch_buffer_header (p3, LOAD);
953 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
954 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
957 /* speculatively enqueue b0 and b1 to the current next frame */
958 to_next[0] = bi0 = from[0];
959 to_next[1] = bi1 = from[1];
965 b0 = vlib_get_buffer (vm, bi0);
966 b1 = vlib_get_buffer (vm, bi1);
968 next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
970 if (is_output_feature)
971 iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
973 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
976 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
978 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
981 if (PREDICT_FALSE (ip0->ttl == 1))
983 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
984 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
985 ICMP4_time_exceeded_ttl_exceeded_in_transit,
987 next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
991 udp0 = ip4_next_header (ip0);
992 tcp0 = (tcp_header_t *) udp0;
993 icmp0 = (icmp46_header_t *) udp0;
994 proto0 = ip_proto_to_snat_proto (ip0->protocol);
998 if (PREDICT_FALSE (proto0 == ~0))
1000 s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
1002 thread_index, now, vm,
1005 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1010 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1012 next0 = icmp_in2out_ed_slow_path
1013 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1014 next0, now, thread_index, &s0);
1021 if (PREDICT_FALSE (proto0 == ~0))
1023 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1027 if (ip4_is_fragment (ip0))
1029 next0 = NAT_IN2OUT_ED_NEXT_REASS;
1034 if (is_output_feature)
1037 (nat_not_translate_output_feature_fwd
1038 (sm, ip0, thread_index, now, vm, b0)))
1042 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1044 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1049 make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1050 ip0->protocol, rx_fib_index0, udp0->src_port,
1053 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1057 if (is_output_feature)
1060 (nat44_ed_not_translate_output_feature
1061 (sm, ip0, ip0->protocol, udp0->src_port,
1062 udp0->dst_port, thread_index, sw_if_index0,
1063 vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1068 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1077 slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1078 next0, thread_index, now, tcp0);
1080 if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1083 if (PREDICT_FALSE (!s0))
1088 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1094 s0 = pool_elt_at_index (tsm->sessions, value0.value);
1097 b0->flags |= VNET_BUFFER_F_IS_NATED;
1099 if (!is_output_feature)
1100 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1102 old_addr0 = ip0->src_address.as_u32;
1103 new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1104 sum0 = ip0->checksum;
1105 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1107 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1108 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1109 s0->ext_host_addr.as_u32, ip4_header_t,
1111 ip0->checksum = ip_csum_fold (sum0);
1113 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1115 old_port0 = tcp0->src_port;
1116 new_port0 = tcp0->src_port = s0->out2in.port;
1118 sum0 = tcp0->checksum;
1119 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1121 sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1123 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1125 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1126 s0->ext_host_addr.as_u32,
1127 ip4_header_t, dst_address);
1128 sum0 = ip_csum_update (sum0, tcp0->dst_port,
1129 s0->ext_host_port, ip4_header_t,
1131 tcp0->dst_port = s0->ext_host_port;
1132 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1134 mss_clamping (sm, tcp0, &sum0);
1135 tcp0->checksum = ip_csum_fold (sum0);
1137 if (nat44_set_tcp_session_state_i2o
1138 (sm, s0, tcp0, thread_index))
1143 udp0->src_port = s0->out2in.port;
1145 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1147 udp0->dst_port = s0->ext_host_port;
1148 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1154 nat44_session_update_counters (s0, now,
1155 vlib_buffer_length_in_chain (vm,
1157 /* Per-user LRU list maintenance */
1158 nat44_session_update_lru (sm, s0, thread_index);
1161 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1162 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1164 nat_in2out_ed_trace_t *t =
1165 vlib_add_trace (vm, node, b0, sizeof (*t));
1166 t->is_slow_path = is_slow_path;
1167 t->sw_if_index = sw_if_index0;
1168 t->next_index = next0;
1169 t->session_index = ~0;
1171 t->session_index = s0 - tsm->sessions;
1174 pkts_processed += next0 == NAT_IN2OUT_ED_NEXT_LOOKUP;
1177 next1 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1179 if (is_output_feature)
1180 iph_offset1 = vnet_buffer (b1)->ip.save_rewrite_length;
1182 ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
1185 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
1187 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1190 if (PREDICT_FALSE (ip1->ttl == 1))
1192 vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1193 icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
1194 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1196 next1 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
1200 udp1 = ip4_next_header (ip1);
1201 tcp1 = (tcp_header_t *) udp1;
1202 icmp1 = (icmp46_header_t *) udp1;
1203 proto1 = ip_proto_to_snat_proto (ip1->protocol);
1207 if (PREDICT_FALSE (proto1 == ~0))
1209 s1 = nat44_ed_in2out_unknown_proto (sm, b1, ip1,
1211 thread_index, now, vm,
1214 next1 = NAT_IN2OUT_ED_NEXT_DROP;
1219 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1221 next1 = icmp_in2out_ed_slow_path
1222 (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
1223 next1, now, thread_index, &s1);
1230 if (PREDICT_FALSE (proto1 == ~0))
1232 next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1236 if (ip4_is_fragment (ip1))
1238 next1 = NAT_IN2OUT_ED_NEXT_REASS;
1243 if (is_output_feature)
1246 (nat_not_translate_output_feature_fwd
1247 (sm, ip1, thread_index, now, vm, b1)))
1251 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1253 next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1258 make_ed_kv (&kv1, &ip1->src_address, &ip1->dst_address,
1259 ip1->protocol, rx_fib_index1, udp1->src_port,
1262 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv1, &value1))
1266 if (is_output_feature)
1269 (nat44_ed_not_translate_output_feature
1270 (sm, ip1, ip1->protocol, udp1->src_port,
1271 udp1->dst_port, thread_index, sw_if_index1,
1272 vnet_buffer (b1)->sw_if_index[VLIB_TX])))
1277 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1286 slow_path_ed (sm, b1, rx_fib_index1, &kv1, &s1, node,
1287 next1, thread_index, now, tcp1);
1289 if (PREDICT_FALSE (next1 == NAT_IN2OUT_ED_NEXT_DROP))
1292 if (PREDICT_FALSE (!s1))
1297 next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1303 s1 = pool_elt_at_index (tsm->sessions, value1.value);
1306 b1->flags |= VNET_BUFFER_F_IS_NATED;
1308 if (!is_output_feature)
1309 vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
1311 old_addr1 = ip1->src_address.as_u32;
1312 new_addr1 = ip1->src_address.as_u32 = s1->out2in.addr.as_u32;
1313 sum1 = ip1->checksum;
1314 sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1316 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1317 sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1318 s1->ext_host_addr.as_u32, ip4_header_t,
1320 ip1->checksum = ip_csum_fold (sum1);
1322 if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1324 old_port1 = tcp1->src_port;
1325 new_port1 = tcp1->src_port = s1->out2in.port;
1327 sum1 = tcp1->checksum;
1328 sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t,
1330 sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t,
1332 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1334 sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32,
1335 s1->ext_host_addr.as_u32,
1336 ip4_header_t, dst_address);
1337 sum1 = ip_csum_update (sum1, tcp1->dst_port,
1338 s1->ext_host_port, ip4_header_t,
1340 tcp1->dst_port = s1->ext_host_port;
1341 ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1343 tcp1->checksum = ip_csum_fold (sum1);
1344 mss_clamping (sm, tcp1, &sum1);
1346 if (nat44_set_tcp_session_state_i2o
1347 (sm, s1, tcp1, thread_index))
1352 udp1->src_port = s1->out2in.port;
1354 if (PREDICT_FALSE (is_twice_nat_session (s1)))
1356 udp1->dst_port = s1->ext_host_port;
1357 ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32;
1363 nat44_session_update_counters (s1, now,
1364 vlib_buffer_length_in_chain (vm,
1366 /* Per-user LRU list maintenance */
1367 nat44_session_update_lru (sm, s1, thread_index);
1370 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1371 && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1373 nat_in2out_ed_trace_t *t =
1374 vlib_add_trace (vm, node, b1, sizeof (*t));
1375 t->is_slow_path = is_slow_path;
1376 t->sw_if_index = sw_if_index1;
1377 t->next_index = next1;
1378 t->session_index = ~0;
1380 t->session_index = s1 - tsm->sessions;
1383 pkts_processed += next1 == NAT_IN2OUT_ED_NEXT_LOOKUP;
1385 /* verify speculative enqueues, maybe switch current next frame */
1386 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1387 to_next, n_left_to_next,
1388 bi0, bi1, next0, next1);
1391 while (n_left_from > 0 && n_left_to_next > 0)
1395 u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0,
1396 new_addr0, old_addr0;
1397 u16 old_port0, new_port0;
1401 icmp46_header_t *icmp0;
1402 snat_session_t *s0 = 0;
1403 clib_bihash_kv_16_8_t kv0, value0;
1406 /* speculatively enqueue b0 to the current next frame */
1412 n_left_to_next -= 1;
1414 b0 = vlib_get_buffer (vm, bi0);
1415 next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1417 if (is_output_feature)
1418 iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1420 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1423 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1425 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1428 if (PREDICT_FALSE (ip0->ttl == 1))
1430 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1431 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1432 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1434 next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR;
1438 udp0 = ip4_next_header (ip0);
1439 tcp0 = (tcp_header_t *) udp0;
1440 icmp0 = (icmp46_header_t *) udp0;
1441 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1445 if (PREDICT_FALSE (proto0 == ~0))
1447 s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0,
1449 thread_index, now, vm,
1452 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1457 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1459 next0 = icmp_in2out_ed_slow_path
1460 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1461 next0, now, thread_index, &s0);
1468 if (PREDICT_FALSE (proto0 == ~0))
1470 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1474 if (ip4_is_fragment (ip0))
1476 next0 = NAT_IN2OUT_ED_NEXT_REASS;
1481 if (is_output_feature)
1484 (nat_not_translate_output_feature_fwd
1485 (sm, ip0, thread_index, now, vm, b0)))
1489 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1491 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1496 make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1497 ip0->protocol, rx_fib_index0, udp0->src_port,
1500 if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0))
1504 if (is_output_feature)
1507 (nat44_ed_not_translate_output_feature
1508 (sm, ip0, ip0->protocol, udp0->src_port,
1509 udp0->dst_port, thread_index, sw_if_index0,
1510 vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1515 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1524 slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node,
1525 next0, thread_index, now, tcp0);
1527 if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1530 if (PREDICT_FALSE (!s0))
1535 next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH;
1541 s0 = pool_elt_at_index (tsm->sessions, value0.value);
1544 b0->flags |= VNET_BUFFER_F_IS_NATED;
1546 if (!is_output_feature)
1547 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1549 old_addr0 = ip0->src_address.as_u32;
1550 new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32;
1551 sum0 = ip0->checksum;
1552 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1554 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1555 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1556 s0->ext_host_addr.as_u32, ip4_header_t,
1558 ip0->checksum = ip_csum_fold (sum0);
1560 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1562 old_port0 = tcp0->src_port;
1563 new_port0 = tcp0->src_port = s0->out2in.port;
1565 sum0 = tcp0->checksum;
1566 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
1568 sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t,
1570 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1572 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1573 s0->ext_host_addr.as_u32,
1574 ip4_header_t, dst_address);
1575 sum0 = ip_csum_update (sum0, tcp0->dst_port,
1576 s0->ext_host_port, ip4_header_t,
1578 tcp0->dst_port = s0->ext_host_port;
1579 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1581 mss_clamping (sm, tcp0, &sum0);
1582 tcp0->checksum = ip_csum_fold (sum0);
1584 if (nat44_set_tcp_session_state_i2o
1585 (sm, s0, tcp0, thread_index))
1590 udp0->src_port = s0->out2in.port;
1592 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1594 udp0->dst_port = s0->ext_host_port;
1595 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
1601 nat44_session_update_counters (s0, now,
1602 vlib_buffer_length_in_chain (vm,
1604 /* Per-user LRU list maintenance */
1605 nat44_session_update_lru (sm, s0, thread_index);
1608 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1609 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1611 nat_in2out_ed_trace_t *t =
1612 vlib_add_trace (vm, node, b0, sizeof (*t));
1613 t->is_slow_path = is_slow_path;
1614 t->sw_if_index = sw_if_index0;
1615 t->next_index = next0;
1616 t->session_index = ~0;
1618 t->session_index = s0 - tsm->sessions;
1621 pkts_processed += next0 == NAT_IN2OUT_ED_NEXT_LOOKUP;
1623 /* verify speculative enqueue, maybe switch current next frame */
1624 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1625 to_next, n_left_to_next,
1629 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1632 vlib_node_increment_counter (vm, stats_node_index,
1633 NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS,
1635 vlib_node_increment_counter (vm, stats_node_index,
1636 NAT_IN2OUT_ED_ERROR_TCP_PACKETS, tcp_packets);
1637 vlib_node_increment_counter (vm, stats_node_index,
1638 NAT_IN2OUT_ED_ERROR_UDP_PACKETS, tcp_packets);
1639 vlib_node_increment_counter (vm, stats_node_index,
1640 NAT_IN2OUT_ED_ERROR_ICMP_PACKETS,
1642 vlib_node_increment_counter (vm, stats_node_index,
1643 NAT_IN2OUT_ED_ERROR_OTHER_PACKETS,
1645 vlib_node_increment_counter (vm, stats_node_index,
1646 NAT_IN2OUT_ED_ERROR_FRAGMENTS, fragments);
1648 return frame->n_vectors;
1652 nat44_ed_in2out_fast_path_fn (vlib_main_t * vm,
1653 vlib_node_runtime_t * node,
1654 vlib_frame_t * frame)
1656 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 0);
1660 VLIB_REGISTER_NODE (nat44_ed_in2out_node) = {
1661 .function = nat44_ed_in2out_fast_path_fn,
1662 .name = "nat44-ed-in2out",
1663 .vector_size = sizeof (u32),
1664 .format_trace = format_nat_in2out_ed_trace,
1665 .type = VLIB_NODE_TYPE_INTERNAL,
1666 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1667 .error_strings = nat_in2out_ed_error_strings,
1668 .runtime_data_bytes = sizeof (snat_runtime_t),
1669 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1671 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1672 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
1673 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath",
1674 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1675 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1680 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_node,
1681 nat44_ed_in2out_fast_path_fn);
1684 nat44_ed_in2out_output_fast_path_fn (vlib_main_t * vm,
1685 vlib_node_runtime_t * node,
1686 vlib_frame_t * frame)
1688 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 1);
1692 VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = {
1693 .function = nat44_ed_in2out_output_fast_path_fn,
1694 .name = "nat44-ed-in2out-output",
1695 .vector_size = sizeof (u32),
1696 .format_trace = format_nat_in2out_ed_trace,
1697 .type = VLIB_NODE_TYPE_INTERNAL,
1698 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1699 .error_strings = nat_in2out_ed_error_strings,
1700 .runtime_data_bytes = sizeof (snat_runtime_t),
1701 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1703 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1704 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
1705 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath",
1706 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1707 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass-output",
1712 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_node,
1713 nat44_ed_in2out_output_fast_path_fn);
1716 nat44_ed_in2out_slow_path_fn (vlib_main_t * vm,
1717 vlib_node_runtime_t * node,
1718 vlib_frame_t * frame)
1720 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 0);
1724 VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = {
1725 .function = nat44_ed_in2out_slow_path_fn,
1726 .name = "nat44-ed-in2out-slowpath",
1727 .vector_size = sizeof (u32),
1728 .format_trace = format_nat_in2out_ed_trace,
1729 .type = VLIB_NODE_TYPE_INTERNAL,
1730 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1731 .error_strings = nat_in2out_ed_error_strings,
1732 .runtime_data_bytes = sizeof (snat_runtime_t),
1733 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1735 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1736 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
1737 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath",
1738 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1739 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1744 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_slowpath_node,
1745 nat44_ed_in2out_slow_path_fn);
1748 nat44_ed_in2out_output_slow_path_fn (vlib_main_t * vm,
1749 vlib_node_runtime_t * node,
1750 vlib_frame_t * frame)
1752 return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 1);
1756 VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = {
1757 .function = nat44_ed_in2out_output_slow_path_fn,
1758 .name = "nat44-ed-in2out-output-slowpath",
1759 .vector_size = sizeof (u32),
1760 .format_trace = format_nat_in2out_ed_trace,
1761 .type = VLIB_NODE_TYPE_INTERNAL,
1762 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
1763 .error_strings = nat_in2out_ed_error_strings,
1764 .runtime_data_bytes = sizeof (snat_runtime_t),
1765 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
1767 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
1768 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
1769 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath",
1770 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1771 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
1776 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_slowpath_node,
1777 nat44_ed_in2out_output_slow_path_fn);
1780 nat44_ed_in2out_reass_node_fn_inline (vlib_main_t * vm,
1781 vlib_node_runtime_t * node,
1782 vlib_frame_t * frame,
1783 int is_output_feature)
1785 u32 n_left_from, *from, *to_next;
1786 nat_in2out_ed_next_t next_index;
1787 u32 pkts_processed = 0, cached_fragments = 0;
1788 snat_main_t *sm = &snat_main;
1789 f64 now = vlib_time_now (vm);
1790 u32 thread_index = vm->thread_index;
1791 snat_main_per_thread_data_t *per_thread_data =
1792 &sm->per_thread_data[thread_index];
1793 u32 *fragments_to_drop = 0;
1794 u32 *fragments_to_loopback = 0;
1796 from = vlib_frame_vector_args (frame);
1797 n_left_from = frame->n_vectors;
1798 next_index = node->cached_next_index;
1800 while (n_left_from > 0)
1804 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1806 while (n_left_from > 0 && n_left_to_next > 0)
1808 u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
1809 u32 iph_offset0 = 0;
1813 ip4_header_t *ip0 = 0;
1814 nat_reass_ip4_t *reass0;
1817 icmp46_header_t *icmp0;
1818 clib_bihash_kv_16_8_t kv0, value0;
1819 snat_session_t *s0 = 0;
1820 u16 old_port0, new_port0;
1823 /* speculatively enqueue b0 to the current next frame */
1829 n_left_to_next -= 1;
1831 b0 = vlib_get_buffer (vm, bi0);
1833 next0 = NAT_IN2OUT_ED_NEXT_LOOKUP;
1835 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1837 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1840 if (PREDICT_FALSE (nat_reass_is_drop_frag (0)))
1842 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1843 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT];
1847 if (is_output_feature)
1848 iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length;
1850 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1853 udp0 = ip4_next_header (ip0);
1854 tcp0 = (tcp_header_t *) udp0;
1855 icmp0 = (icmp46_header_t *) udp0;
1856 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1858 reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
1862 1, &fragments_to_drop);
1864 if (PREDICT_FALSE (!reass0))
1866 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1867 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_REASS];
1868 nat_log_notice ("maximum reassemblies exceeded");
1872 if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1874 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1876 if (is_output_feature)
1879 (nat_not_translate_output_feature_fwd
1880 (sm, ip0, thread_index, now, vm, b0)))
1881 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1885 next0 = icmp_in2out_ed_slow_path
1886 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1887 next0, now, thread_index, &s0);
1889 if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP))
1892 reass0->sess_index = s0 - per_thread_data->sessions;
1894 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1895 nat_ip4_reass_get_frags (reass0,
1896 &fragments_to_loopback);
1902 make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address,
1903 ip0->protocol, rx_fib_index0, udp0->src_port,
1906 if (clib_bihash_search_16_8
1907 (&per_thread_data->in2out_ed, &kv0, &value0))
1909 if (is_output_feature)
1912 (nat44_ed_not_translate_output_feature
1913 (sm, ip0, ip0->protocol, udp0->src_port,
1914 udp0->dst_port, thread_index, sw_if_index0,
1915 vnet_buffer (b0)->sw_if_index[VLIB_TX])))
1917 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1918 nat_ip4_reass_get_frags (reass0,
1919 &fragments_to_loopback);
1925 if (PREDICT_FALSE (nat44_ed_not_translate (sm, node,
1931 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1932 nat_ip4_reass_get_frags (reass0,
1933 &fragments_to_loopback);
1938 next0 = slow_path_ed (sm, b0, rx_fib_index0, &kv0,
1939 &s0, node, next0, thread_index, now,
1942 if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP))
1945 if (PREDICT_FALSE (!s0))
1947 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1951 reass0->sess_index = s0 - per_thread_data->sessions;
1955 s0 = pool_elt_at_index (per_thread_data->sessions,
1957 reass0->sess_index = value0.value;
1959 nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
1963 if (reass0->flags & NAT_REASS_FLAG_ED_DONT_TRANSLATE)
1965 if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
1967 if (nat_ip4_reass_add_fragment
1968 (reass0, bi0, &fragments_to_drop))
1970 b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_FRAG];
1972 ("maximum fragments per reassembly exceeded");
1973 next0 = NAT_IN2OUT_ED_NEXT_DROP;
1979 s0 = pool_elt_at_index (per_thread_data->sessions,
1980 reass0->sess_index);
1983 old_addr0 = ip0->src_address.as_u32;
1984 ip0->src_address = s0->out2in.addr;
1985 new_addr0 = ip0->src_address.as_u32;
1986 if (!is_output_feature)
1987 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1989 sum0 = ip0->checksum;
1990 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1992 src_address /* changed member */ );
1993 if (PREDICT_FALSE (is_twice_nat_session (s0)))
1994 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
1995 s0->ext_host_addr.as_u32, ip4_header_t,
1997 ip0->checksum = ip_csum_fold (sum0);
1999 if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
2001 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
2003 old_port0 = tcp0->src_port;
2004 tcp0->src_port = s0->out2in.port;
2005 new_port0 = tcp0->src_port;
2007 sum0 = tcp0->checksum;
2008 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
2010 dst_address /* changed member */ );
2011 sum0 = ip_csum_update (sum0, old_port0, new_port0,
2012 ip4_header_t /* cheat */ ,
2013 length /* changed member */ );
2014 if (PREDICT_FALSE (is_twice_nat_session (s0)))
2016 sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32,
2017 s0->ext_host_addr.as_u32,
2018 ip4_header_t, dst_address);
2019 sum0 = ip_csum_update (sum0, tcp0->dst_port,
2020 s0->ext_host_port, ip4_header_t,
2022 tcp0->dst_port = s0->ext_host_port;
2023 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
2025 tcp0->checksum = ip_csum_fold (sum0);
2029 old_port0 = udp0->src_port;
2030 udp0->src_port = s0->out2in.port;
2032 if (PREDICT_FALSE (is_twice_nat_session (s0)))
2034 udp0->dst_port = s0->ext_host_port;
2035 ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32;
2041 nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port,
2042 s0->ext_host_port, proto0, 1);
2045 nat44_session_update_counters (s0, now,
2046 vlib_buffer_length_in_chain (vm,
2048 /* Per-user LRU list maintenance */
2049 nat44_session_update_lru (sm, s0, thread_index);
2052 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
2053 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
2055 nat44_reass_trace_t *t =
2056 vlib_add_trace (vm, node, b0, sizeof (*t));
2057 t->cached = cached0;
2058 t->sw_if_index = sw_if_index0;
2059 t->next_index = next0;
2070 pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP;
2072 /* verify speculative enqueue, maybe switch current next frame */
2073 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2074 to_next, n_left_to_next,
2078 if (n_left_from == 0 && vec_len (fragments_to_loopback))
2080 from = vlib_frame_vector_args (frame);
2081 u32 len = vec_len (fragments_to_loopback);
2082 if (len <= VLIB_FRAME_SIZE)
2084 clib_memcpy_fast (from, fragments_to_loopback,
2085 sizeof (u32) * len);
2087 vec_reset_length (fragments_to_loopback);
2091 clib_memcpy_fast (from, fragments_to_loopback +
2092 (len - VLIB_FRAME_SIZE),
2093 sizeof (u32) * VLIB_FRAME_SIZE);
2094 n_left_from = VLIB_FRAME_SIZE;
2095 _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
2100 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2103 vlib_node_increment_counter (vm, nat44_ed_in2out_reass_node.index,
2104 NAT_IN2OUT_ED_ERROR_PROCESSED_FRAGMENTS,
2106 vlib_node_increment_counter (vm, nat44_ed_in2out_reass_node.index,
2107 NAT_IN2OUT_ED_ERROR_CACHED_FRAGMENTS,
2110 nat_send_all_to_node (vm, fragments_to_drop, node,
2111 &node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT],
2112 NAT_IN2OUT_ED_NEXT_DROP);
2114 vec_free (fragments_to_drop);
2115 vec_free (fragments_to_loopback);
2116 return frame->n_vectors;
2120 nat44_ed_in2out_reass_node_fn (vlib_main_t * vm,
2121 vlib_node_runtime_t * node,
2122 vlib_frame_t * frame)
2124 return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 0);
2128 VLIB_REGISTER_NODE (nat44_ed_in2out_reass_node) = {
2129 .function = nat44_ed_in2out_reass_node_fn,
2130 .name = "nat44-ed-in2out-reass",
2131 .vector_size = sizeof (u32),
2132 .format_trace = format_nat44_reass_trace,
2133 .type = VLIB_NODE_TYPE_INTERNAL,
2134 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2135 .error_strings = nat_in2out_ed_error_strings,
2136 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
2138 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
2139 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup",
2140 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
2141 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2142 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
2147 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_node,
2148 nat44_ed_in2out_reass_node_fn);
2151 nat44_ed_in2out_reass_output_node_fn (vlib_main_t * vm,
2152 vlib_node_runtime_t * node,
2153 vlib_frame_t * frame)
2155 return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 1);
2159 VLIB_REGISTER_NODE (nat44_ed_in2out_reass_output_node) = {
2160 .function = nat44_ed_in2out_reass_output_node_fn,
2161 .name = "nat44-ed-in2out-reass-output",
2162 .vector_size = sizeof (u32),
2163 .format_trace = format_nat44_reass_trace,
2164 .type = VLIB_NODE_TYPE_INTERNAL,
2165 .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings),
2166 .error_strings = nat_in2out_ed_error_strings,
2167 .n_next_nodes = NAT_IN2OUT_ED_N_NEXT,
2169 [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop",
2170 [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output",
2171 [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
2172 [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2173 [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass",
2178 VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_output_node,
2179 nat44_ed_in2out_reass_output_node_fn);
2182 * fd.io coding-style-patch-verification: ON
2185 * eval: (c-set-style "gnu")