2 * Copyright (c) 2016 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 inside to outside network translation
20 #include <vlib/vlib.h>
21 #include <vnet/vnet.h>
22 #include <vnet/pg/pg.h>
24 #include <vnet/ip/ip.h>
25 #include <vnet/ethernet/ethernet.h>
26 #include <vnet/fib/ip4_fib.h>
27 #include <vnet/udp/udp.h>
29 #include <nat/nat_ipfix_logging.h>
30 #include <nat/nat_inlines.h>
31 #include <nat/nat44/inlines.h>
32 #include <nat/nat_syslog.h>
33 #include <nat/nat_ha.h>
35 #include <vppinfra/hash.h>
36 #include <vppinfra/error.h>
37 #include <vppinfra/elog.h>
45 } snat_in2out_trace_t;
47 /* packet trace format function */
49 format_snat_in2out_trace (u8 * s, va_list * args)
51 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
52 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
53 snat_in2out_trace_t *t = va_arg (*args, snat_in2out_trace_t *);
56 tag = t->is_slow_path ? "NAT44_IN2OUT_SLOW_PATH" : "NAT44_IN2OUT_FAST_PATH";
58 s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
59 t->sw_if_index, t->next_index, t->session_index);
65 format_snat_in2out_fast_trace (u8 * s, va_list * args)
67 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
68 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
69 snat_in2out_trace_t *t = va_arg (*args, snat_in2out_trace_t *);
71 s = format (s, "NAT44_IN2OUT_FAST: sw_if_index %d, next index %d",
72 t->sw_if_index, t->next_index);
77 #define foreach_snat_in2out_error \
78 _(UNSUPPORTED_PROTOCOL, "unsupported protocol") \
79 _(IN2OUT_PACKETS, "good in2out packets processed") \
80 _(OUT_OF_PORTS, "out of ports") \
81 _(BAD_OUTSIDE_FIB, "outside VRF ID not found") \
82 _(BAD_ICMP_TYPE, "unsupported ICMP type") \
83 _(NO_TRANSLATION, "no translation") \
84 _(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \
85 _(DROP_FRAGMENT, "drop fragment") \
86 _(TCP_PACKETS, "TCP packets") \
87 _(UDP_PACKETS, "UDP packets") \
88 _(ICMP_PACKETS, "ICMP packets") \
89 _(OTHER_PACKETS, "other protocol packets") \
90 _(FRAGMENTS, "fragments") \
91 _(CACHED_FRAGMENTS, "cached fragments") \
92 _(PROCESSED_FRAGMENTS, "processed fragments")
96 #define _(sym,str) SNAT_IN2OUT_ERROR_##sym,
97 foreach_snat_in2out_error
100 } snat_in2out_error_t;
102 static char *snat_in2out_error_strings[] = {
103 #define _(sym,string) string,
104 foreach_snat_in2out_error
110 SNAT_IN2OUT_NEXT_LOOKUP,
111 SNAT_IN2OUT_NEXT_DROP,
112 SNAT_IN2OUT_NEXT_ICMP_ERROR,
113 SNAT_IN2OUT_NEXT_SLOW_PATH,
115 } snat_in2out_next_t;
118 snat_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
119 u32 sw_if_index0, ip4_header_t * ip0, u32 proto0,
120 u32 rx_fib_index0, u32 thread_index)
122 udp_header_t *udp0 = ip4_next_header (ip0);
123 snat_session_key_t key0, sm0;
124 clib_bihash_kv_8_8_t kv0, value0;
126 key0.addr = ip0->dst_address;
127 key0.port = udp0->dst_port;
128 key0.protocol = proto0;
129 key0.fib_index = sm->outside_fib_index;
130 kv0.key = key0.as_u64;
132 /* NAT packet aimed at external address if */
133 /* has active sessions */
134 if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0,
137 /* or is static mappings */
138 if (!snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0, 0))
144 if (sm->forwarding_enabled)
147 return snat_not_translate_fast (sm, node, sw_if_index0, ip0, proto0,
152 nat_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip0,
153 u32 proto0, u16 src_port, u16 dst_port,
154 u32 thread_index, u32 sw_if_index)
156 snat_session_key_t key0;
157 clib_bihash_kv_8_8_t kv0, value0;
161 key0.addr = ip0->src_address;
162 key0.port = src_port;
163 key0.protocol = proto0;
164 key0.fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
165 kv0.key = key0.as_u64;
167 if (!clib_bihash_search_8_8
168 (&sm->per_thread_data[thread_index].out2in, &kv0, &value0))
172 key0.addr = ip0->dst_address;
173 key0.port = dst_port;
174 key0.protocol = proto0;
175 kv0.key = key0.as_u64;
176 if (!clib_bihash_search_8_8
177 (&sm->per_thread_data[thread_index].in2out, &kv0, &value0))
181 pool_foreach (i, sm->output_feature_interfaces,
183 if ((nat_interface_is_inside(i)) && (sw_if_index == i->sw_if_index))
193 #ifndef CLIB_MARCH_VARIANT
195 nat44_i2o_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg)
197 snat_main_t *sm = &snat_main;
198 nat44_is_idle_session_ctx_t *ctx = arg;
200 u64 sess_timeout_time;
201 snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
203 clib_bihash_kv_8_8_t s_kv;
205 s = pool_elt_at_index (tsm->sessions, kv->value);
206 sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
207 if (ctx->now >= sess_timeout_time)
209 s_kv.key = s->out2in.as_u64;
210 if (clib_bihash_add_del_8_8 (&tsm->out2in, &s_kv, 0))
211 nat_elog_warn ("out2in key del failed");
213 snat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
214 s->in2out.addr.as_u32,
215 s->out2in.addr.as_u32,
219 s->in2out.fib_index);
221 nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
222 &s->in2out.addr, s->in2out.port,
223 &s->out2in.addr, s->out2in.port,
226 nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
227 s->ext_host_port, s->out2in.protocol, s->out2in.fib_index,
230 if (!snat_is_session_static (s))
231 snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
234 nat44_delete_session (sm, s, ctx->thread_index);
243 slow_path (snat_main_t * sm, vlib_buffer_t * b0,
246 snat_session_key_t * key0,
247 snat_session_t ** sessionp,
248 vlib_node_runtime_t * node, u32 next0, u32 thread_index, f64 now)
251 snat_session_t *s = 0;
252 clib_bihash_kv_8_8_t kv0;
253 snat_session_key_t key1;
255 nat_outside_fib_t *outside_fib;
256 fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
259 .fp_proto = FIB_PROTOCOL_IP4,
262 .ip4.as_u32 = ip0->dst_address.as_u32,
265 nat44_is_idle_session_ctx_t ctx0;
267 nat44_session_try_cleanup (&ip0->src_address, rx_fib_index0, thread_index,
270 if (PREDICT_FALSE (nat44_maximum_sessions_exceeded (sm, thread_index)))
272 b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED];
273 nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
274 nat_elog_notice ("maximum sessions exceeded");
275 return SNAT_IN2OUT_NEXT_DROP;
278 key1.protocol = key0->protocol;
280 /* First try to match static mapping by local address and port */
281 if (snat_static_mapping_match
282 (sm, *key0, &key1, 0, 0, 0, 0, 0, &identity_nat))
284 /* Try to create dynamic translation */
285 if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index0,
289 [thread_index].snat_thread_index))
291 b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
292 return SNAT_IN2OUT_NEXT_DROP;
297 if (PREDICT_FALSE (identity_nat))
306 u = nat_user_get_or_create (sm, &ip0->src_address, rx_fib_index0,
310 nat_elog_warn ("create NAT user failed");
311 return SNAT_IN2OUT_NEXT_DROP;
314 s = nat_session_alloc_or_recycle (sm, u, thread_index, now);
317 nat44_delete_user_with_no_session (sm, u, thread_index);
318 nat_elog_warn ("create NAT session failed");
319 return SNAT_IN2OUT_NEXT_DROP;
323 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
324 user_session_increment (sm, u, is_sm);
327 s->out2in.protocol = key0->protocol;
328 s->out2in.fib_index = sm->outside_fib_index;
329 switch (vec_len (sm->outside_fibs))
332 s->out2in.fib_index = sm->outside_fib_index;
335 s->out2in.fib_index = sm->outside_fibs[0].fib_index;
339 vec_foreach (outside_fib, sm->outside_fibs)
341 fei = fib_table_lookup (outside_fib->fib_index, &pfx);
342 if (FIB_NODE_INDEX_INVALID != fei)
344 if (fib_entry_get_resolving_interface (fei) != ~0)
346 s->out2in.fib_index = outside_fib->fib_index;
354 s->ext_host_addr.as_u32 = ip0->dst_address.as_u32;
355 s->ext_host_port = vnet_buffer (b0)->ip.reass.l4_dst_port;
358 /* Add to translation hashes */
360 ctx0.thread_index = thread_index;
361 kv0.key = s->in2out.as_u64;
362 kv0.value = s - sm->per_thread_data[thread_index].sessions;
363 if (clib_bihash_add_or_overwrite_stale_8_8
364 (&sm->per_thread_data[thread_index].in2out, &kv0,
365 nat44_i2o_is_idle_session_cb, &ctx0))
366 nat_elog_notice ("in2out key add failed");
368 kv0.key = s->out2in.as_u64;
369 kv0.value = s - sm->per_thread_data[thread_index].sessions;
371 if (clib_bihash_add_or_overwrite_stale_8_8
372 (&sm->per_thread_data[thread_index].out2in, &kv0,
373 nat44_o2i_is_idle_session_cb, &ctx0))
374 nat_elog_notice ("out2in key add failed");
377 snat_ipfix_logging_nat44_ses_create (thread_index,
378 s->in2out.addr.as_u32,
379 s->out2in.addr.as_u32,
382 s->out2in.port, s->in2out.fib_index);
384 nat_syslog_nat44_apmadd (s->user_index, s->in2out.fib_index,
385 &s->in2out.addr, s->in2out.port, &s->out2in.addr,
386 s->out2in.port, s->in2out.protocol);
388 nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
389 s->out2in.port, &s->ext_host_addr, s->ext_host_port,
390 &s->ext_host_nat_addr, s->ext_host_nat_port,
391 s->in2out.protocol, s->in2out.fib_index, s->flags,
397 #ifndef CLIB_MARCH_VARIANT
399 snat_in2out_error_t icmp_get_key (vlib_buffer_t * b, ip4_header_t * ip0,
400 snat_session_key_t * p_key0)
402 icmp46_header_t *icmp0;
403 snat_session_key_t key0;
404 icmp_echo_header_t *echo0, *inner_echo0 = 0;
405 ip4_header_t *inner_ip0 = 0;
407 icmp46_header_t *inner_icmp0;
409 icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
410 echo0 = (icmp_echo_header_t *) (icmp0 + 1);
412 if (!icmp_type_is_error_message
413 (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
415 key0.protocol = SNAT_PROTOCOL_ICMP;
416 key0.addr = ip0->src_address;
417 key0.port = vnet_buffer (b)->ip.reass.l4_src_port; // TODO fixme should this be dst port?
421 inner_ip0 = (ip4_header_t *) (echo0 + 1);
422 l4_header = ip4_next_header (inner_ip0);
423 key0.protocol = ip_proto_to_snat_proto (inner_ip0->protocol);
424 key0.addr = inner_ip0->dst_address;
425 switch (key0.protocol)
427 case SNAT_PROTOCOL_ICMP:
428 inner_icmp0 = (icmp46_header_t *) l4_header;
429 inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
430 key0.port = inner_echo0->identifier;
432 case SNAT_PROTOCOL_UDP:
433 case SNAT_PROTOCOL_TCP:
434 key0.port = ((tcp_udp_header_t *) l4_header)->dst_port;
437 return SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL;
441 return -1; /* success */
445 * Get address and port values to be used for ICMP packet translation
446 * and create session if needed
448 * @param[in,out] sm NAT main
449 * @param[in,out] node NAT node runtime
450 * @param[in] thread_index thread index
451 * @param[in,out] b0 buffer containing packet to be translated
452 * @param[out] p_proto protocol used for matching
453 * @param[out] p_value address and port after NAT translation
454 * @param[out] p_dont_translate if packet should not be translated
455 * @param d optional parameter
456 * @param e optional parameter
459 icmp_match_in2out_slow (snat_main_t * sm, vlib_node_runtime_t * node,
460 u32 thread_index, vlib_buffer_t * b0,
461 ip4_header_t * ip0, u8 * p_proto,
462 snat_session_key_t * p_value,
463 u8 * p_dont_translate, void *d, void *e)
467 snat_session_key_t key0;
468 snat_session_t *s0 = 0;
469 u8 dont_translate = 0;
470 clib_bihash_kv_8_8_t kv0, value0;
474 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
475 rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
477 err = icmp_get_key (b0, ip0, &key0);
480 b0->error = node->errors[err];
481 next0 = SNAT_IN2OUT_NEXT_DROP;
484 key0.fib_index = rx_fib_index0;
486 kv0.key = key0.as_u64;
488 if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].in2out, &kv0,
491 if (vnet_buffer (b0)->sw_if_index[VLIB_TX] != ~0)
493 if (PREDICT_FALSE (nat_not_translate_output_feature (sm, ip0,
506 if (PREDICT_FALSE (snat_not_translate (sm, node, sw_if_index0,
507 ip0, SNAT_PROTOCOL_ICMP,
517 (icmp_type_is_error_message
518 (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags)))
520 b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
521 next0 = SNAT_IN2OUT_NEXT_DROP;
525 next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, &s0, node, next0,
526 thread_index, vlib_time_now (sm->vlib_main));
528 if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
540 (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
542 && vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
544 && !icmp_type_is_error_message (vnet_buffer (b0)->ip.
545 reass.icmp_type_or_tcp_flags)))
547 b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
548 next0 = SNAT_IN2OUT_NEXT_DROP;
552 s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
557 *p_proto = key0.protocol;
559 *p_value = s0->out2in;
560 *p_dont_translate = dont_translate;
562 *(snat_session_t **) d = s0;
567 #ifndef CLIB_MARCH_VARIANT
569 * Get address and port values to be used for ICMP packet translation
571 * @param[in] sm NAT main
572 * @param[in,out] node NAT node runtime
573 * @param[in] thread_index thread index
574 * @param[in,out] b0 buffer containing packet to be translated
575 * @param[out] p_proto protocol used for matching
576 * @param[out] p_value address and port after NAT translation
577 * @param[out] p_dont_translate if packet should not be translated
578 * @param d optional parameter
579 * @param e optional parameter
582 icmp_match_in2out_fast (snat_main_t * sm, vlib_node_runtime_t * node,
583 u32 thread_index, vlib_buffer_t * b0,
584 ip4_header_t * ip0, u8 * p_proto,
585 snat_session_key_t * p_value,
586 u8 * p_dont_translate, void *d, void *e)
590 snat_session_key_t key0;
591 snat_session_key_t sm0;
592 u8 dont_translate = 0;
597 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
598 rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
600 err = icmp_get_key (b0, ip0, &key0);
603 b0->error = node->errors[err];
604 next0 = SNAT_IN2OUT_NEXT_DROP;
607 key0.fib_index = rx_fib_index0;
609 if (snat_static_mapping_match
610 (sm, key0, &sm0, 0, &is_addr_only, 0, 0, 0, 0))
612 if (PREDICT_FALSE (snat_not_translate_fast (sm, node, sw_if_index0, ip0,
620 if (icmp_type_is_error_message
621 (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags))
623 next0 = SNAT_IN2OUT_NEXT_DROP;
627 b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
628 next0 = SNAT_IN2OUT_NEXT_DROP;
633 (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_request
634 && (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
635 ICMP4_echo_reply || !is_addr_only)
636 && !icmp_type_is_error_message (vnet_buffer (b0)->ip.
637 reass.icmp_type_or_tcp_flags)))
639 b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
640 next0 = SNAT_IN2OUT_NEXT_DROP;
647 *p_proto = key0.protocol;
648 *p_dont_translate = dont_translate;
653 #ifndef CLIB_MARCH_VARIANT
655 icmp_in2out (snat_main_t * sm,
658 icmp46_header_t * icmp0,
661 vlib_node_runtime_t * node,
662 u32 next0, u32 thread_index, void *d, void *e)
664 snat_session_key_t sm0;
666 icmp_echo_header_t *echo0, *inner_echo0 = 0;
667 ip4_header_t *inner_ip0;
669 icmp46_header_t *inner_icmp0;
671 u32 new_addr0, old_addr0;
672 u16 old_id0, new_id0;
673 u16 old_checksum0, new_checksum0;
678 echo0 = (icmp_echo_header_t *) (icmp0 + 1);
680 next0_tmp = sm->icmp_match_in2out_cb (sm, node, thread_index, b0, ip0,
681 &protocol, &sm0, &dont_translate, d,
685 if (next0 == SNAT_IN2OUT_NEXT_DROP || dont_translate)
688 if (PREDICT_TRUE (!ip4_is_fragment (ip0)))
690 sum0 = ip_incremental_checksum_buffer (sm->vlib_main, b0, (u8 *) icmp0 -
692 vlib_buffer_get_current (b0),
693 ntohs (ip0->length) -
694 ip4_header_bytes (ip0), 0);
695 checksum0 = ~ip_csum_fold (sum0);
696 if (PREDICT_FALSE (checksum0 != 0 && checksum0 != 0xffff))
698 next0 = SNAT_IN2OUT_NEXT_DROP;
703 old_addr0 = ip0->src_address.as_u32;
704 new_addr0 = ip0->src_address.as_u32 = sm0.addr.as_u32;
706 sum0 = ip0->checksum;
707 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
708 src_address /* changed member */ );
709 ip0->checksum = ip_csum_fold (sum0);
711 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
713 if (icmp0->checksum == 0)
714 icmp0->checksum = 0xffff;
716 if (!icmp_type_is_error_message (icmp0->type))
719 if (PREDICT_FALSE (new_id0 != echo0->identifier))
721 old_id0 = echo0->identifier;
723 echo0->identifier = new_id0;
725 sum0 = icmp0->checksum;
727 ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
729 icmp0->checksum = ip_csum_fold (sum0);
734 inner_ip0 = (ip4_header_t *) (echo0 + 1);
735 l4_header = ip4_next_header (inner_ip0);
737 if (!ip4_header_checksum_is_valid (inner_ip0))
739 next0 = SNAT_IN2OUT_NEXT_DROP;
743 /* update inner destination IP address */
744 old_addr0 = inner_ip0->dst_address.as_u32;
745 inner_ip0->dst_address = sm0.addr;
746 new_addr0 = inner_ip0->dst_address.as_u32;
747 sum0 = icmp0->checksum;
748 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
749 dst_address /* changed member */ );
750 icmp0->checksum = ip_csum_fold (sum0);
752 /* update inner IP header checksum */
753 old_checksum0 = inner_ip0->checksum;
754 sum0 = inner_ip0->checksum;
755 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
756 dst_address /* changed member */ );
757 inner_ip0->checksum = ip_csum_fold (sum0);
758 new_checksum0 = inner_ip0->checksum;
759 sum0 = icmp0->checksum;
761 ip_csum_update (sum0, old_checksum0, new_checksum0, ip4_header_t,
763 icmp0->checksum = ip_csum_fold (sum0);
767 case SNAT_PROTOCOL_ICMP:
768 inner_icmp0 = (icmp46_header_t *) l4_header;
769 inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
771 old_id0 = inner_echo0->identifier;
773 inner_echo0->identifier = new_id0;
775 sum0 = icmp0->checksum;
777 ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
779 icmp0->checksum = ip_csum_fold (sum0);
781 case SNAT_PROTOCOL_UDP:
782 case SNAT_PROTOCOL_TCP:
783 old_id0 = ((tcp_udp_header_t *) l4_header)->dst_port;
785 ((tcp_udp_header_t *) l4_header)->dst_port = new_id0;
787 sum0 = icmp0->checksum;
788 sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t,
790 icmp0->checksum = ip_csum_fold (sum0);
798 if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0)
800 if (sm->deterministic ||
801 0 != snat_icmp_hairpinning (sm, b0, ip0, icmp0,
802 sm->endpoint_dependent))
803 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
812 icmp_in2out_slow_path (snat_main_t * sm,
815 icmp46_header_t * icmp0,
818 vlib_node_runtime_t * node,
820 f64 now, u32 thread_index, snat_session_t ** p_s0)
822 next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
823 next0, thread_index, p_s0, 0);
824 snat_session_t *s0 = *p_s0;
825 if (PREDICT_TRUE (next0 != SNAT_IN2OUT_NEXT_DROP && s0))
828 nat44_session_update_counters (s0, now,
829 vlib_buffer_length_in_chain
830 (sm->vlib_main, b0), thread_index);
831 /* Per-user LRU list maintenance */
832 nat44_session_update_lru (sm, s0, thread_index);
838 nat_in2out_sm_unknown_proto (snat_main_t * sm,
840 ip4_header_t * ip, u32 rx_fib_index)
842 clib_bihash_kv_8_8_t kv, value;
843 snat_static_mapping_t *m;
844 snat_session_key_t m_key;
845 u32 old_addr, new_addr;
848 m_key.addr = ip->src_address;
851 m_key.fib_index = rx_fib_index;
852 kv.key = m_key.as_u64;
853 if (clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
856 m = pool_elt_at_index (sm->static_mappings, value.value);
858 old_addr = ip->src_address.as_u32;
859 new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
861 sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
862 ip->checksum = ip_csum_fold (sum);
866 if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
868 vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
869 nat_hairpinning_sm_unknown_proto (sm, b, ip);
876 snat_in2out_node_fn_inline (vlib_main_t * vm,
877 vlib_node_runtime_t * node,
878 vlib_frame_t * frame, int is_slow_path,
879 int is_output_feature)
881 u32 n_left_from, *from, *to_next;
882 snat_in2out_next_t next_index;
883 u32 pkts_processed = 0;
884 snat_main_t *sm = &snat_main;
885 f64 now = vlib_time_now (vm);
886 u32 stats_node_index;
887 u32 thread_index = vm->thread_index;
888 u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
891 stats_node_index = is_slow_path ? sm->in2out_slowpath_node_index :
892 sm->in2out_node_index;
894 from = vlib_frame_vector_args (frame);
895 n_left_from = frame->n_vectors;
896 next_index = node->cached_next_index;
898 while (n_left_from > 0)
902 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
904 while (n_left_from >= 4 && n_left_to_next >= 2)
907 vlib_buffer_t *b0, *b1;
909 u32 sw_if_index0, sw_if_index1;
910 ip4_header_t *ip0, *ip1;
911 ip_csum_t sum0, sum1;
912 u32 new_addr0, old_addr0, new_addr1, old_addr1;
913 u16 old_port0, new_port0, old_port1, new_port1;
914 udp_header_t *udp0, *udp1;
915 tcp_header_t *tcp0, *tcp1;
916 icmp46_header_t *icmp0, *icmp1;
917 snat_session_key_t key0, key1;
918 u32 rx_fib_index0, rx_fib_index1;
920 snat_session_t *s0 = 0, *s1 = 0;
921 clib_bihash_kv_8_8_t kv0, value0, kv1, value1;
922 u32 iph_offset0 = 0, iph_offset1 = 0;
924 /* Prefetch next iteration. */
926 vlib_buffer_t *p2, *p3;
928 p2 = vlib_get_buffer (vm, from[2]);
929 p3 = vlib_get_buffer (vm, from[3]);
931 vlib_prefetch_buffer_header (p2, LOAD);
932 vlib_prefetch_buffer_header (p3, LOAD);
934 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
935 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
938 /* speculatively enqueue b0 and b1 to the current next frame */
939 to_next[0] = bi0 = from[0];
940 to_next[1] = bi1 = from[1];
946 b0 = vlib_get_buffer (vm, bi0);
947 b1 = vlib_get_buffer (vm, bi1);
949 if (is_output_feature)
950 iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
952 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
955 udp0 = ip4_next_header (ip0);
956 tcp0 = (tcp_header_t *) udp0;
957 icmp0 = (icmp46_header_t *) udp0;
959 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
960 rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
963 next0 = next1 = SNAT_IN2OUT_NEXT_LOOKUP;
965 if (PREDICT_FALSE (ip0->ttl == 1))
967 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
968 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
969 ICMP4_time_exceeded_ttl_exceeded_in_transit,
971 next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
975 proto0 = ip_proto_to_snat_proto (ip0->protocol);
977 /* Next configured feature, probably ip4-lookup */
980 if (PREDICT_FALSE (proto0 == ~0))
982 if (nat_in2out_sm_unknown_proto
983 (sm, b0, ip0, rx_fib_index0))
985 next0 = SNAT_IN2OUT_NEXT_DROP;
987 node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
993 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
995 next0 = icmp_in2out_slow_path
996 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0,
997 node, next0, now, thread_index, &s0);
1004 if (PREDICT_FALSE (proto0 == ~0))
1006 next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1010 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1012 next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1017 key0.addr = ip0->src_address;
1018 key0.port = vnet_buffer (b0)->ip.reass.l4_src_port;
1019 key0.protocol = proto0;
1020 key0.fib_index = rx_fib_index0;
1022 kv0.key = key0.as_u64;
1025 (clib_bihash_search_8_8
1026 (&sm->per_thread_data[thread_index].in2out, &kv0,
1031 if (is_output_feature)
1034 (nat_not_translate_output_feature
1036 vnet_buffer (b0)->ip.reass.l4_src_port,
1037 vnet_buffer (b0)->ip.reass.l4_dst_port,
1038 thread_index, sw_if_index0)))
1042 * Send DHCP packets to the ipv4 stack, or we won't
1043 * be able to use dhcp client on the outside interface
1046 (proto0 == SNAT_PROTOCOL_UDP
1047 && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
1048 clib_host_to_net_u16
1049 (UDP_DST_PORT_dhcp_to_server))
1050 && ip0->dst_address.as_u32 == 0xffffffff))
1057 (sm, node, sw_if_index0, ip0, proto0,
1058 rx_fib_index0, thread_index)))
1062 next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
1063 &s0, node, next0, thread_index, now);
1064 if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
1067 if (PREDICT_FALSE (!s0))
1072 next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1078 pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1081 b0->flags |= VNET_BUFFER_F_IS_NATED;
1083 old_addr0 = ip0->src_address.as_u32;
1084 ip0->src_address = s0->out2in.addr;
1085 new_addr0 = ip0->src_address.as_u32;
1086 if (!is_output_feature)
1087 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1089 sum0 = ip0->checksum;
1090 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1092 src_address /* changed member */ );
1093 ip0->checksum = ip_csum_fold (sum0);
1096 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1098 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1100 old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1101 new_port0 = udp0->src_port = s0->out2in.port;
1102 sum0 = tcp0->checksum;
1103 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1105 dst_address /* changed member */ );
1106 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1107 ip4_header_t /* cheat */ ,
1108 length /* changed member */ );
1109 mss_clamping (sm, tcp0, &sum0);
1110 tcp0->checksum = ip_csum_fold (sum0);
1116 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1118 if (PREDICT_FALSE (udp0->checksum))
1120 old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1121 new_port0 = udp0->src_port = s0->out2in.port;
1122 sum0 = udp0->checksum;
1123 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */
1126 ip_csum_update (sum0, old_port0, new_port0,
1127 ip4_header_t /* cheat */ ,
1128 length /* changed member */ );
1129 udp0->checksum = ip_csum_fold (sum0);
1136 nat44_session_update_counters (s0, now,
1137 vlib_buffer_length_in_chain (vm, b0),
1139 /* Per-user LRU list maintenance */
1140 nat44_session_update_lru (sm, s0, thread_index);
1143 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1144 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1146 snat_in2out_trace_t *t =
1147 vlib_add_trace (vm, node, b0, sizeof (*t));
1148 t->is_slow_path = is_slow_path;
1149 t->sw_if_index = sw_if_index0;
1150 t->next_index = next0;
1151 t->session_index = ~0;
1154 s0 - sm->per_thread_data[thread_index].sessions;
1157 pkts_processed += next0 == SNAT_IN2OUT_NEXT_LOOKUP;
1159 if (is_output_feature)
1160 iph_offset1 = vnet_buffer (b1)->ip.reass.save_rewrite_length;
1162 ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
1165 udp1 = ip4_next_header (ip1);
1166 tcp1 = (tcp_header_t *) udp1;
1167 icmp1 = (icmp46_header_t *) udp1;
1169 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
1170 rx_fib_index1 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
1173 if (PREDICT_FALSE (ip1->ttl == 1))
1175 vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1176 icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
1177 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1179 next1 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
1183 proto1 = ip_proto_to_snat_proto (ip1->protocol);
1185 /* Next configured feature, probably ip4-lookup */
1188 if (PREDICT_FALSE (proto1 == ~0))
1190 if (nat_in2out_sm_unknown_proto
1191 (sm, b1, ip1, rx_fib_index1))
1193 next1 = SNAT_IN2OUT_NEXT_DROP;
1195 node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
1201 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1203 next1 = icmp_in2out_slow_path
1204 (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
1205 next1, now, thread_index, &s1);
1212 if (PREDICT_FALSE (proto1 == ~0))
1214 next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1218 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1220 next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1225 key1.addr = ip1->src_address;
1226 key1.port = vnet_buffer (b1)->ip.reass.l4_src_port;
1227 key1.protocol = proto1;
1228 key1.fib_index = rx_fib_index1;
1230 kv1.key = key1.as_u64;
1233 (clib_bihash_search_8_8
1234 (&sm->per_thread_data[thread_index].in2out, &kv1,
1239 if (is_output_feature)
1242 (nat_not_translate_output_feature
1244 vnet_buffer (b1)->ip.reass.l4_src_port,
1245 vnet_buffer (b1)->ip.reass.l4_dst_port,
1246 thread_index, sw_if_index1)))
1250 * Send DHCP packets to the ipv4 stack, or we won't
1251 * be able to use dhcp client on the outside interface
1254 (proto1 == SNAT_PROTOCOL_UDP
1255 && (vnet_buffer (b1)->ip.reass.l4_dst_port ==
1256 clib_host_to_net_u16
1257 (UDP_DST_PORT_dhcp_to_server))
1258 && ip1->dst_address.as_u32 == 0xffffffff))
1265 (sm, node, sw_if_index1, ip1, proto1,
1266 rx_fib_index1, thread_index)))
1270 next1 = slow_path (sm, b1, ip1, rx_fib_index1, &key1,
1271 &s1, node, next1, thread_index, now);
1272 if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP))
1275 if (PREDICT_FALSE (!s1))
1280 next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1286 pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1289 b1->flags |= VNET_BUFFER_F_IS_NATED;
1291 old_addr1 = ip1->src_address.as_u32;
1292 ip1->src_address = s1->out2in.addr;
1293 new_addr1 = ip1->src_address.as_u32;
1294 if (!is_output_feature)
1295 vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
1297 sum1 = ip1->checksum;
1298 sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1300 src_address /* changed member */ );
1301 ip1->checksum = ip_csum_fold (sum1);
1303 if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1305 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1307 old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port;
1308 new_port1 = udp1->src_port = s1->out2in.port;
1309 sum1 = tcp1->checksum;
1310 sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1312 dst_address /* changed member */ );
1313 sum1 = ip_csum_update (sum1, old_port1, new_port1,
1314 ip4_header_t /* cheat */ ,
1315 length /* changed member */ );
1316 mss_clamping (sm, tcp1, &sum1);
1317 tcp1->checksum = ip_csum_fold (sum1);
1323 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1325 if (PREDICT_FALSE (udp1->checksum))
1327 old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port;
1328 new_port1 = udp1->src_port = s1->out2in.port;
1329 sum1 = udp1->checksum;
1330 sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, dst_address /* changed member */
1333 ip_csum_update (sum1, old_port1, new_port1,
1334 ip4_header_t /* cheat */ ,
1335 length /* changed member */ );
1336 udp1->checksum = ip_csum_fold (sum1);
1343 nat44_session_update_counters (s1, now,
1344 vlib_buffer_length_in_chain (vm, b1),
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 snat_in2out_trace_t *t =
1354 vlib_add_trace (vm, node, b1, sizeof (*t));
1355 t->sw_if_index = sw_if_index1;
1356 t->next_index = next1;
1357 t->session_index = ~0;
1360 s1 - sm->per_thread_data[thread_index].sessions;
1363 pkts_processed += next1 == SNAT_IN2OUT_NEXT_LOOKUP;
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)
1379 u32 new_addr0, old_addr0;
1380 u16 old_port0, new_port0;
1383 icmp46_header_t *icmp0;
1384 snat_session_key_t key0;
1387 snat_session_t *s0 = 0;
1388 clib_bihash_kv_8_8_t kv0, value0;
1389 u32 iph_offset0 = 0;
1391 /* speculatively enqueue b0 to the current next frame */
1397 n_left_to_next -= 1;
1399 b0 = vlib_get_buffer (vm, bi0);
1400 next0 = SNAT_IN2OUT_NEXT_LOOKUP;
1402 if (is_output_feature)
1403 iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
1405 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1408 udp0 = ip4_next_header (ip0);
1409 tcp0 = (tcp_header_t *) udp0;
1410 icmp0 = (icmp46_header_t *) udp0;
1412 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1413 rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
1416 if (PREDICT_FALSE (ip0->ttl == 1))
1418 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1419 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1420 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1422 next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
1426 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1428 /* Next configured feature, probably ip4-lookup */
1431 if (PREDICT_FALSE (proto0 == ~0))
1433 if (nat_in2out_sm_unknown_proto
1434 (sm, b0, ip0, rx_fib_index0))
1436 next0 = SNAT_IN2OUT_NEXT_DROP;
1438 node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
1444 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1446 next0 = icmp_in2out_slow_path
1447 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1448 next0, now, thread_index, &s0);
1455 if (PREDICT_FALSE (proto0 == ~0))
1457 next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1461 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1463 next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1468 key0.addr = ip0->src_address;
1469 key0.port = vnet_buffer (b0)->ip.reass.l4_src_port;
1470 key0.protocol = proto0;
1471 key0.fib_index = rx_fib_index0;
1473 kv0.key = key0.as_u64;
1475 if (clib_bihash_search_8_8
1476 (&sm->per_thread_data[thread_index].in2out, &kv0, &value0))
1480 if (is_output_feature)
1483 (nat_not_translate_output_feature
1485 vnet_buffer (b0)->ip.reass.l4_src_port,
1486 vnet_buffer (b0)->ip.reass.l4_dst_port,
1487 thread_index, sw_if_index0)))
1491 * Send DHCP packets to the ipv4 stack, or we won't
1492 * be able to use dhcp client on the outside interface
1495 (proto0 == SNAT_PROTOCOL_UDP
1496 && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
1497 clib_host_to_net_u16
1498 (UDP_DST_PORT_dhcp_to_server))
1499 && ip0->dst_address.as_u32 == 0xffffffff))
1506 (sm, node, sw_if_index0, ip0, proto0,
1507 rx_fib_index0, thread_index)))
1511 next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
1512 &s0, node, next0, thread_index, now);
1514 if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
1517 if (PREDICT_FALSE (!s0))
1522 next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1528 pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1531 b0->flags |= VNET_BUFFER_F_IS_NATED;
1533 old_addr0 = ip0->src_address.as_u32;
1534 ip0->src_address = s0->out2in.addr;
1535 new_addr0 = ip0->src_address.as_u32;
1536 if (!is_output_feature)
1537 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1539 sum0 = ip0->checksum;
1540 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1542 src_address /* changed member */ );
1543 ip0->checksum = ip_csum_fold (sum0);
1545 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1547 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1549 old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1550 new_port0 = udp0->src_port = s0->out2in.port;
1551 sum0 = tcp0->checksum;
1552 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1554 dst_address /* changed member */ );
1555 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1556 ip4_header_t /* cheat */ ,
1557 length /* changed member */ );
1558 mss_clamping (sm, tcp0, &sum0);
1559 tcp0->checksum = ip_csum_fold (sum0);
1565 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1567 if (PREDICT_FALSE (udp0->checksum))
1569 old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1570 new_port0 = udp0->src_port = s0->out2in.port;
1571 sum0 = udp0->checksum;
1572 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */
1575 ip_csum_update (sum0, old_port0, new_port0,
1576 ip4_header_t /* cheat */ ,
1577 length /* changed member */ );
1578 udp0->checksum = ip_csum_fold (sum0);
1585 nat44_session_update_counters (s0, now,
1586 vlib_buffer_length_in_chain (vm, b0),
1588 /* Per-user LRU list maintenance */
1589 nat44_session_update_lru (sm, s0, thread_index);
1592 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1593 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1595 snat_in2out_trace_t *t =
1596 vlib_add_trace (vm, node, b0, sizeof (*t));
1597 t->is_slow_path = is_slow_path;
1598 t->sw_if_index = sw_if_index0;
1599 t->next_index = next0;
1600 t->session_index = ~0;
1603 s0 - sm->per_thread_data[thread_index].sessions;
1606 pkts_processed += next0 == SNAT_IN2OUT_NEXT_LOOKUP;
1608 /* verify speculative enqueue, maybe switch current next frame */
1609 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1610 to_next, n_left_to_next,
1614 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1617 vlib_node_increment_counter (vm, stats_node_index,
1618 SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
1620 vlib_node_increment_counter (vm, stats_node_index,
1621 SNAT_IN2OUT_ERROR_TCP_PACKETS, tcp_packets);
1622 vlib_node_increment_counter (vm, stats_node_index,
1623 SNAT_IN2OUT_ERROR_UDP_PACKETS, udp_packets);
1624 vlib_node_increment_counter (vm, stats_node_index,
1625 SNAT_IN2OUT_ERROR_ICMP_PACKETS, icmp_packets);
1626 vlib_node_increment_counter (vm, stats_node_index,
1627 SNAT_IN2OUT_ERROR_OTHER_PACKETS,
1629 vlib_node_increment_counter (vm, stats_node_index,
1630 SNAT_IN2OUT_ERROR_FRAGMENTS, fragments);
1632 return frame->n_vectors;
1635 VLIB_NODE_FN (snat_in2out_node) (vlib_main_t * vm,
1636 vlib_node_runtime_t * node,
1637 vlib_frame_t * frame)
1639 return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */ ,
1644 VLIB_REGISTER_NODE (snat_in2out_node) = {
1645 .name = "nat44-in2out",
1646 .vector_size = sizeof (u32),
1647 .format_trace = format_snat_in2out_trace,
1648 .type = VLIB_NODE_TYPE_INTERNAL,
1650 .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1651 .error_strings = snat_in2out_error_strings,
1653 .runtime_data_bytes = sizeof (snat_runtime_t),
1655 .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1657 /* edit / add dispositions here */
1659 [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1660 [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1661 [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
1662 [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1667 VLIB_NODE_FN (snat_in2out_output_node) (vlib_main_t * vm,
1668 vlib_node_runtime_t * node,
1669 vlib_frame_t * frame)
1671 return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */ ,
1676 VLIB_REGISTER_NODE (snat_in2out_output_node) = {
1677 .name = "nat44-in2out-output",
1678 .vector_size = sizeof (u32),
1679 .format_trace = format_snat_in2out_trace,
1680 .type = VLIB_NODE_TYPE_INTERNAL,
1682 .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1683 .error_strings = snat_in2out_error_strings,
1685 .runtime_data_bytes = sizeof (snat_runtime_t),
1687 .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1689 /* edit / add dispositions here */
1691 [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1692 [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
1693 [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
1694 [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1699 VLIB_NODE_FN (snat_in2out_slowpath_node) (vlib_main_t * vm,
1700 vlib_node_runtime_t * node,
1701 vlib_frame_t * frame)
1703 return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */ ,
1708 VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = {
1709 .name = "nat44-in2out-slowpath",
1710 .vector_size = sizeof (u32),
1711 .format_trace = format_snat_in2out_trace,
1712 .type = VLIB_NODE_TYPE_INTERNAL,
1714 .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1715 .error_strings = snat_in2out_error_strings,
1717 .runtime_data_bytes = sizeof (snat_runtime_t),
1719 .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1721 /* edit / add dispositions here */
1723 [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1724 [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1725 [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
1726 [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1731 VLIB_NODE_FN (snat_in2out_output_slowpath_node) (vlib_main_t * vm,
1732 vlib_node_runtime_t * node,
1733 vlib_frame_t * frame)
1735 return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */ ,
1740 VLIB_REGISTER_NODE (snat_in2out_output_slowpath_node) = {
1741 .name = "nat44-in2out-output-slowpath",
1742 .vector_size = sizeof (u32),
1743 .format_trace = format_snat_in2out_trace,
1744 .type = VLIB_NODE_TYPE_INTERNAL,
1746 .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1747 .error_strings = snat_in2out_error_strings,
1749 .runtime_data_bytes = sizeof (snat_runtime_t),
1751 .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1753 /* edit / add dispositions here */
1755 [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1756 [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
1757 [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
1758 [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1763 VLIB_NODE_FN (snat_in2out_fast_node) (vlib_main_t * vm,
1764 vlib_node_runtime_t * node,
1765 vlib_frame_t * frame)
1767 u32 n_left_from, *from, *to_next;
1768 snat_in2out_next_t next_index;
1769 u32 pkts_processed = 0;
1770 snat_main_t *sm = &snat_main;
1771 u32 stats_node_index;
1773 stats_node_index = sm->in2out_fast_node_index;
1775 from = vlib_frame_vector_args (frame);
1776 n_left_from = frame->n_vectors;
1777 next_index = node->cached_next_index;
1779 while (n_left_from > 0)
1783 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1785 while (n_left_from > 0 && n_left_to_next > 0)
1793 u32 new_addr0, old_addr0;
1794 u16 old_port0, new_port0;
1797 icmp46_header_t *icmp0;
1798 snat_session_key_t key0, sm0;
1802 /* speculatively enqueue b0 to the current next frame */
1808 n_left_to_next -= 1;
1810 b0 = vlib_get_buffer (vm, bi0);
1811 next0 = SNAT_IN2OUT_NEXT_LOOKUP;
1813 ip0 = vlib_buffer_get_current (b0);
1814 udp0 = ip4_next_header (ip0);
1815 tcp0 = (tcp_header_t *) udp0;
1816 icmp0 = (icmp46_header_t *) udp0;
1818 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1820 ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1822 if (PREDICT_FALSE (ip0->ttl == 1))
1824 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1825 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1826 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1828 next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
1832 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1834 if (PREDICT_FALSE (proto0 == ~0))
1837 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1839 next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0,
1840 rx_fib_index0, node, next0, ~0, 0, 0);
1844 key0.addr = ip0->src_address;
1845 key0.protocol = proto0;
1846 key0.port = udp0->src_port;
1847 key0.fib_index = rx_fib_index0;
1849 if (snat_static_mapping_match (sm, key0, &sm0, 0, 0, 0, 0, 0, 0))
1851 b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
1852 next0 = SNAT_IN2OUT_NEXT_DROP;
1856 new_addr0 = sm0.addr.as_u32;
1857 new_port0 = sm0.port;
1858 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
1859 old_addr0 = ip0->src_address.as_u32;
1860 ip0->src_address.as_u32 = new_addr0;
1862 sum0 = ip0->checksum;
1863 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1865 src_address /* changed member */ );
1866 ip0->checksum = ip_csum_fold (sum0);
1868 if (PREDICT_FALSE (new_port0 != udp0->dst_port))
1870 old_port0 = udp0->src_port;
1871 udp0->src_port = new_port0;
1873 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1875 sum0 = tcp0->checksum;
1876 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1878 dst_address /* changed member */ );
1879 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1880 ip4_header_t /* cheat */ ,
1881 length /* changed member */ );
1882 mss_clamping (sm, tcp0, &sum0);
1883 tcp0->checksum = ip_csum_fold (sum0);
1885 else if (udp0->checksum)
1887 sum0 = udp0->checksum;
1888 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1890 dst_address /* changed member */ );
1891 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1892 ip4_header_t /* cheat */ ,
1893 length /* changed member */ );
1894 udp0->checksum = ip_csum_fold (sum0);
1899 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1901 sum0 = tcp0->checksum;
1902 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1904 dst_address /* changed member */ );
1905 mss_clamping (sm, tcp0, &sum0);
1906 tcp0->checksum = ip_csum_fold (sum0);
1908 else if (udp0->checksum)
1910 sum0 = udp0->checksum;
1911 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1913 dst_address /* changed member */ );
1914 udp0->checksum = ip_csum_fold (sum0);
1919 snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0, 0);
1922 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1923 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1925 snat_in2out_trace_t *t =
1926 vlib_add_trace (vm, node, b0, sizeof (*t));
1927 t->sw_if_index = sw_if_index0;
1928 t->next_index = next0;
1931 pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
1933 /* verify speculative enqueue, maybe switch current next frame */
1934 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1935 to_next, n_left_to_next,
1939 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1942 vlib_node_increment_counter (vm, stats_node_index,
1943 SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
1945 return frame->n_vectors;
1950 VLIB_REGISTER_NODE (snat_in2out_fast_node) = {
1951 .name = "nat44-in2out-fast",
1952 .vector_size = sizeof (u32),
1953 .format_trace = format_snat_in2out_fast_trace,
1954 .type = VLIB_NODE_TYPE_INTERNAL,
1956 .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1957 .error_strings = snat_in2out_error_strings,
1959 .runtime_data_bytes = sizeof (snat_runtime_t),
1961 .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1963 /* edit / add dispositions here */
1965 [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1966 [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1967 [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
1968 [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1974 * fd.io coding-style-patch-verification: ON
1977 * eval: (c-set-style "gnu")