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 endpoint-dependent outside to inside 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/udp/udp.h>
26 #include <vnet/ethernet/ethernet.h>
27 #include <vnet/fib/ip4_fib.h>
29 #include <nat/nat_ipfix_logging.h>
30 #include <nat/nat_reass.h>
31 #include <nat/nat_inlines.h>
32 #include <nat/nat44_inlines.h>
33 #include <nat/nat_syslog.h>
34 #include <nat/nat_ha.h>
36 #include <vppinfra/hash.h>
37 #include <vppinfra/error.h>
38 #include <vppinfra/elog.h>
45 } snat_out2in_trace_t;
47 /* packet trace format function */
49 format_snat_out2in_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_out2in_trace_t *t = va_arg (*args, snat_out2in_trace_t *);
57 "NAT44_OUT2IN: sw_if_index %d, next index %d, session index %d",
58 t->sw_if_index, t->next_index, t->session_index);
63 format_snat_out2in_fast_trace (u8 * s, va_list * args)
65 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
66 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
67 snat_out2in_trace_t *t = va_arg (*args, snat_out2in_trace_t *);
69 s = format (s, "NAT44_OUT2IN_FAST: sw_if_index %d, next index %d",
70 t->sw_if_index, t->next_index);
74 #define foreach_snat_out2in_error \
75 _(UNSUPPORTED_PROTOCOL, "unsupported protocol") \
76 _(OUT2IN_PACKETS, "good out2in packets processed") \
77 _(OUT_OF_PORTS, "out of ports") \
78 _(BAD_ICMP_TYPE, "unsupported ICMP type") \
79 _(NO_TRANSLATION, "no translation") \
80 _(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \
81 _(DROP_FRAGMENT, "drop fragment") \
82 _(MAX_REASS, "maximum reassemblies exceeded") \
83 _(MAX_FRAG, "maximum fragments per reassembly exceeded")\
84 _(TCP_PACKETS, "TCP packets") \
85 _(UDP_PACKETS, "UDP packets") \
86 _(ICMP_PACKETS, "ICMP packets") \
87 _(OTHER_PACKETS, "other protocol packets") \
88 _(FRAGMENTS, "fragments") \
89 _(CACHED_FRAGMENTS, "cached fragments") \
90 _(PROCESSED_FRAGMENTS, "processed fragments")
94 #define _(sym,str) SNAT_OUT2IN_ERROR_##sym,
95 foreach_snat_out2in_error
98 } snat_out2in_error_t;
100 static char *snat_out2in_error_strings[] = {
101 #define _(sym,string) string,
102 foreach_snat_out2in_error
108 SNAT_OUT2IN_NEXT_DROP,
109 SNAT_OUT2IN_NEXT_LOOKUP,
110 SNAT_OUT2IN_NEXT_ICMP_ERROR,
111 SNAT_OUT2IN_NEXT_REASS,
113 } snat_out2in_next_t;
115 #ifndef CLIB_MARCH_VARIANT
117 nat44_o2i_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg)
119 snat_main_t *sm = &snat_main;
120 nat44_is_idle_session_ctx_t *ctx = arg;
122 u64 sess_timeout_time;
123 snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
125 clib_bihash_kv_8_8_t s_kv;
127 s = pool_elt_at_index (tsm->sessions, kv->value);
128 sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
129 if (ctx->now >= sess_timeout_time)
131 s_kv.key = s->in2out.as_u64;
132 if (clib_bihash_add_del_8_8 (&tsm->in2out, &s_kv, 0))
133 nat_elog_warn ("out2in key del failed");
135 snat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
136 s->in2out.addr.as_u32,
137 s->out2in.addr.as_u32,
141 s->in2out.fib_index);
143 nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
144 &s->in2out.addr, s->in2out.port,
145 &s->out2in.addr, s->out2in.port,
148 nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
149 s->ext_host_port, s->out2in.protocol, s->out2in.fib_index,
152 if (!snat_is_session_static (s))
153 snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
156 nat44_delete_session (sm, s, ctx->thread_index);
165 * @brief Create session for static mapping.
167 * Create NAT session initiated by host from external network with static
170 * @param sm NAT main.
171 * @param b0 Vlib buffer.
172 * @param in2out In2out NAT44 session key.
173 * @param out2in Out2in NAT44 session key.
174 * @param node Vlib node.
176 * @returns SNAT session if successfully created otherwise 0.
178 static inline snat_session_t *
179 create_session_for_static_mapping (snat_main_t * sm,
181 snat_session_key_t in2out,
182 snat_session_key_t out2in,
183 vlib_node_runtime_t * node,
184 u32 thread_index, f64 now)
188 clib_bihash_kv_8_8_t kv0;
191 nat44_is_idle_session_ctx_t ctx0;
193 nat44_session_try_cleanup (&in2out.addr, in2out.fib_index, thread_index,
196 if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
198 b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_SESSIONS_EXCEEDED];
199 nat_elog_notice ("maximum sessions exceeded");
203 ip0 = vlib_buffer_get_current (b0);
204 udp0 = ip4_next_header (ip0);
207 nat_user_get_or_create (sm, &in2out.addr, in2out.fib_index, thread_index);
210 nat_elog_warn ("create NAT user failed");
214 s = nat_session_alloc_or_recycle (sm, u, thread_index, now);
217 nat44_delete_user_with_no_session (sm, u, thread_index);
218 nat_elog_warn ("create NAT session failed");
222 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
223 s->ext_host_addr.as_u32 = ip0->src_address.as_u32;
224 s->ext_host_port = udp0->src_port;
225 user_session_increment (sm, u, 1 /* static */ );
228 s->in2out.protocol = out2in.protocol;
230 /* Add to translation hashes */
232 ctx0.thread_index = thread_index;
233 kv0.key = s->in2out.as_u64;
234 kv0.value = s - sm->per_thread_data[thread_index].sessions;
235 if (clib_bihash_add_or_overwrite_stale_8_8
236 (&sm->per_thread_data[thread_index].in2out, &kv0,
237 nat44_i2o_is_idle_session_cb, &ctx0))
238 nat_elog_notice ("in2out key add failed");
240 kv0.key = s->out2in.as_u64;
242 if (clib_bihash_add_or_overwrite_stale_8_8
243 (&sm->per_thread_data[thread_index].out2in, &kv0,
244 nat44_o2i_is_idle_session_cb, &ctx0))
245 nat_elog_notice ("out2in key add failed");
248 snat_ipfix_logging_nat44_ses_create (thread_index,
249 s->in2out.addr.as_u32,
250 s->out2in.addr.as_u32,
253 s->out2in.port, s->in2out.fib_index);
255 nat_syslog_nat44_apmadd (s->user_index, s->in2out.fib_index,
256 &s->in2out.addr, s->in2out.port, &s->out2in.addr,
257 s->out2in.port, s->in2out.protocol);
259 nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
260 s->out2in.port, &s->ext_host_addr, s->ext_host_port,
261 &s->ext_host_nat_addr, s->ext_host_nat_port,
262 s->in2out.protocol, s->in2out.fib_index, s->flags,
268 #ifndef CLIB_MARCH_VARIANT
270 snat_out2in_error_t icmp_get_key (ip4_header_t * ip0,
271 snat_session_key_t * p_key0)
273 icmp46_header_t *icmp0;
274 snat_session_key_t key0;
275 icmp_echo_header_t *echo0, *inner_echo0 = 0;
276 ip4_header_t *inner_ip0;
278 icmp46_header_t *inner_icmp0;
280 icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
281 echo0 = (icmp_echo_header_t *) (icmp0 + 1);
283 if (!icmp_is_error_message (icmp0))
285 key0.protocol = SNAT_PROTOCOL_ICMP;
286 key0.addr = ip0->dst_address;
287 key0.port = echo0->identifier;
291 inner_ip0 = (ip4_header_t *) (echo0 + 1);
292 l4_header = ip4_next_header (inner_ip0);
293 key0.protocol = ip_proto_to_snat_proto (inner_ip0->protocol);
294 key0.addr = inner_ip0->src_address;
295 switch (key0.protocol)
297 case SNAT_PROTOCOL_ICMP:
298 inner_icmp0 = (icmp46_header_t *) l4_header;
299 inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
300 key0.port = inner_echo0->identifier;
302 case SNAT_PROTOCOL_UDP:
303 case SNAT_PROTOCOL_TCP:
304 key0.port = ((tcp_udp_header_t *) l4_header)->src_port;
307 return SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL;
311 return -1; /* success */
315 * Get address and port values to be used for ICMP packet translation
316 * and create session if needed
318 * @param[in,out] sm NAT main
319 * @param[in,out] node NAT node runtime
320 * @param[in] thread_index thread index
321 * @param[in,out] b0 buffer containing packet to be translated
322 * @param[out] p_proto protocol used for matching
323 * @param[out] p_value address and port after NAT translation
324 * @param[out] p_dont_translate if packet should not be translated
325 * @param d optional parameter
326 * @param e optional parameter
329 icmp_match_out2in_slow (snat_main_t * sm, vlib_node_runtime_t * node,
330 u32 thread_index, vlib_buffer_t * b0,
331 ip4_header_t * ip0, u8 * p_proto,
332 snat_session_key_t * p_value,
333 u8 * p_dont_translate, void *d, void *e)
335 icmp46_header_t *icmp0;
338 snat_session_key_t key0;
339 snat_session_key_t sm0;
340 snat_session_t *s0 = 0;
341 u8 dont_translate = 0;
342 clib_bihash_kv_8_8_t kv0, value0;
348 icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
349 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
350 rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
354 err = icmp_get_key (ip0, &key0);
357 b0->error = node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
358 next0 = SNAT_OUT2IN_NEXT_DROP;
361 key0.fib_index = rx_fib_index0;
363 kv0.key = key0.as_u64;
365 if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0,
368 /* Try to match static mapping by external address and port,
369 destination address and port in packet */
370 if (snat_static_mapping_match
371 (sm, key0, &sm0, 1, &is_addr_only, 0, 0, 0, &identity_nat))
373 if (!sm->forwarding_enabled)
375 /* Don't NAT packet aimed at the intfc address */
376 if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index0,
377 ip0->dst_address.as_u32)))
382 b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
383 next0 = SNAT_OUT2IN_NEXT_DROP;
393 if (PREDICT_FALSE (icmp0->type != ICMP4_echo_reply &&
394 (icmp0->type != ICMP4_echo_request
397 b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE];
398 next0 = SNAT_OUT2IN_NEXT_DROP;
402 if (PREDICT_FALSE (identity_nat))
407 /* Create session initiated by host from external network */
408 s0 = create_session_for_static_mapping (sm, b0, sm0, key0,
410 vlib_time_now (sm->vlib_main));
414 next0 = SNAT_OUT2IN_NEXT_DROP;
420 if (PREDICT_FALSE (icmp0->type != ICMP4_echo_reply &&
421 icmp0->type != ICMP4_echo_request &&
422 !icmp_is_error_message (icmp0)))
424 b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE];
425 next0 = SNAT_OUT2IN_NEXT_DROP;
429 s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
434 *p_proto = key0.protocol;
436 *p_value = s0->in2out;
437 *p_dont_translate = dont_translate;
439 *(snat_session_t **) d = s0;
444 #ifndef CLIB_MARCH_VARIANT
446 * Get address and port values to be used for ICMP packet translation
448 * @param[in] 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_out2in_fast (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)
465 icmp46_header_t *icmp0;
468 snat_session_key_t key0;
469 snat_session_key_t sm0;
470 u8 dont_translate = 0;
475 icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
476 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
477 rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
479 err = icmp_get_key (ip0, &key0);
482 b0->error = node->errors[err];
483 next0 = SNAT_OUT2IN_NEXT_DROP;
486 key0.fib_index = rx_fib_index0;
488 if (snat_static_mapping_match
489 (sm, key0, &sm0, 1, &is_addr_only, 0, 0, 0, 0))
491 /* Don't NAT packet aimed at the intfc address */
492 if (is_interface_addr (sm, node, sw_if_index0, ip0->dst_address.as_u32))
497 b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
498 next0 = SNAT_OUT2IN_NEXT_DROP;
502 if (PREDICT_FALSE (icmp0->type != ICMP4_echo_reply &&
503 (icmp0->type != ICMP4_echo_request || !is_addr_only) &&
504 !icmp_is_error_message (icmp0)))
506 b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE];
507 next0 = SNAT_OUT2IN_NEXT_DROP;
514 *p_proto = key0.protocol;
515 *p_dont_translate = dont_translate;
520 #ifndef CLIB_MARCH_VARIANT
522 icmp_out2in (snat_main_t * sm,
525 icmp46_header_t * icmp0,
528 vlib_node_runtime_t * node,
529 u32 next0, u32 thread_index, void *d, void *e)
531 snat_session_key_t sm0;
533 icmp_echo_header_t *echo0, *inner_echo0 = 0;
534 ip4_header_t *inner_ip0 = 0;
536 icmp46_header_t *inner_icmp0;
538 u32 new_addr0, old_addr0;
539 u16 old_id0, new_id0;
544 echo0 = (icmp_echo_header_t *) (icmp0 + 1);
546 next0_tmp = sm->icmp_match_out2in_cb (sm, node, thread_index, b0, ip0,
547 &protocol, &sm0, &dont_translate, d,
551 if (next0 == SNAT_OUT2IN_NEXT_DROP || dont_translate)
554 if (PREDICT_TRUE (!ip4_is_fragment (ip0)))
556 sum0 = ip_incremental_checksum_buffer (sm->vlib_main, b0, (u8 *) icmp0 -
558 vlib_buffer_get_current (b0),
559 ntohs (ip0->length) -
560 ip4_header_bytes (ip0), 0);
561 checksum0 = ~ip_csum_fold (sum0);
562 if (checksum0 != 0 && checksum0 != 0xffff)
564 next0 = SNAT_OUT2IN_NEXT_DROP;
569 old_addr0 = ip0->dst_address.as_u32;
570 new_addr0 = ip0->dst_address.as_u32 = sm0.addr.as_u32;
571 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
573 sum0 = ip0->checksum;
574 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
575 dst_address /* changed member */ );
576 ip0->checksum = ip_csum_fold (sum0);
578 if (icmp0->checksum == 0)
579 icmp0->checksum = 0xffff;
581 if (!icmp_is_error_message (icmp0))
584 if (PREDICT_FALSE (new_id0 != echo0->identifier))
586 old_id0 = echo0->identifier;
588 echo0->identifier = new_id0;
590 sum0 = icmp0->checksum;
591 sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
592 identifier /* changed member */ );
593 icmp0->checksum = ip_csum_fold (sum0);
598 inner_ip0 = (ip4_header_t *) (echo0 + 1);
599 l4_header = ip4_next_header (inner_ip0);
601 if (!ip4_header_checksum_is_valid (inner_ip0))
603 next0 = SNAT_OUT2IN_NEXT_DROP;
607 old_addr0 = inner_ip0->src_address.as_u32;
608 inner_ip0->src_address = sm0.addr;
609 new_addr0 = inner_ip0->src_address.as_u32;
611 sum0 = icmp0->checksum;
612 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
613 src_address /* changed member */ );
614 icmp0->checksum = ip_csum_fold (sum0);
618 case SNAT_PROTOCOL_ICMP:
619 inner_icmp0 = (icmp46_header_t *) l4_header;
620 inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
622 old_id0 = inner_echo0->identifier;
624 inner_echo0->identifier = new_id0;
626 sum0 = icmp0->checksum;
627 sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
629 icmp0->checksum = ip_csum_fold (sum0);
631 case SNAT_PROTOCOL_UDP:
632 case SNAT_PROTOCOL_TCP:
633 old_id0 = ((tcp_udp_header_t *) l4_header)->src_port;
635 ((tcp_udp_header_t *) l4_header)->src_port = new_id0;
637 sum0 = icmp0->checksum;
638 sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t,
640 icmp0->checksum = ip_csum_fold (sum0);
653 icmp_out2in_slow_path (snat_main_t * sm,
656 icmp46_header_t * icmp0,
659 vlib_node_runtime_t * node,
661 u32 thread_index, snat_session_t ** p_s0)
663 next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
664 next0, thread_index, p_s0, 0);
665 snat_session_t *s0 = *p_s0;
666 if (PREDICT_TRUE (next0 != SNAT_OUT2IN_NEXT_DROP && s0))
669 nat44_session_update_counters (s0, now,
670 vlib_buffer_length_in_chain
671 (sm->vlib_main, b0), thread_index);
672 /* Per-user LRU list maintenance */
673 nat44_session_update_lru (sm, s0, thread_index);
679 nat_out2in_sm_unknown_proto (snat_main_t * sm,
681 ip4_header_t * ip, u32 rx_fib_index)
683 clib_bihash_kv_8_8_t kv, value;
684 snat_static_mapping_t *m;
685 snat_session_key_t m_key;
686 u32 old_addr, new_addr;
689 m_key.addr = ip->dst_address;
693 kv.key = m_key.as_u64;
694 if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
697 m = pool_elt_at_index (sm->static_mappings, value.value);
699 old_addr = ip->dst_address.as_u32;
700 new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
702 sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
703 ip->checksum = ip_csum_fold (sum);
705 vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
709 VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm,
710 vlib_node_runtime_t * node,
711 vlib_frame_t * frame)
713 u32 n_left_from, *from, *to_next;
714 snat_out2in_next_t next_index;
715 u32 pkts_processed = 0;
716 snat_main_t *sm = &snat_main;
717 f64 now = vlib_time_now (vm);
718 u32 thread_index = vm->thread_index;
719 u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
722 from = vlib_frame_vector_args (frame);
723 n_left_from = frame->n_vectors;
724 next_index = node->cached_next_index;
726 while (n_left_from > 0)
730 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
732 while (n_left_from >= 4 && n_left_to_next >= 2)
735 vlib_buffer_t *b0, *b1;
736 u32 next0 = SNAT_OUT2IN_NEXT_LOOKUP;
737 u32 next1 = SNAT_OUT2IN_NEXT_LOOKUP;
738 u32 sw_if_index0, sw_if_index1;
739 ip4_header_t *ip0, *ip1;
740 ip_csum_t sum0, sum1;
741 u32 new_addr0, old_addr0;
742 u16 new_port0, old_port0;
743 u32 new_addr1, old_addr1;
744 u16 new_port1, old_port1;
745 udp_header_t *udp0, *udp1;
746 tcp_header_t *tcp0, *tcp1;
747 icmp46_header_t *icmp0, *icmp1;
748 snat_session_key_t key0, key1, sm0, sm1;
749 u32 rx_fib_index0, rx_fib_index1;
751 snat_session_t *s0 = 0, *s1 = 0;
752 clib_bihash_kv_8_8_t kv0, kv1, value0, value1;
753 u8 identity_nat0, identity_nat1;
755 /* Prefetch next iteration. */
757 vlib_buffer_t *p2, *p3;
759 p2 = vlib_get_buffer (vm, from[2]);
760 p3 = vlib_get_buffer (vm, from[3]);
762 vlib_prefetch_buffer_header (p2, LOAD);
763 vlib_prefetch_buffer_header (p3, LOAD);
765 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
766 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
769 /* speculatively enqueue b0 and b1 to the current next frame */
770 to_next[0] = bi0 = from[0];
771 to_next[1] = bi1 = from[1];
777 b0 = vlib_get_buffer (vm, bi0);
778 b1 = vlib_get_buffer (vm, bi1);
780 vnet_buffer (b0)->snat.flags = 0;
781 vnet_buffer (b1)->snat.flags = 0;
783 ip0 = vlib_buffer_get_current (b0);
784 udp0 = ip4_next_header (ip0);
785 tcp0 = (tcp_header_t *) udp0;
786 icmp0 = (icmp46_header_t *) udp0;
788 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
789 rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
792 if (PREDICT_FALSE (ip0->ttl == 1))
794 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
795 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
796 ICMP4_time_exceeded_ttl_exceeded_in_transit,
798 next0 = SNAT_OUT2IN_NEXT_ICMP_ERROR;
802 proto0 = ip_proto_to_snat_proto (ip0->protocol);
804 if (PREDICT_FALSE (proto0 == ~0))
806 if (nat_out2in_sm_unknown_proto (sm, b0, ip0, rx_fib_index0))
808 if (!sm->forwarding_enabled)
811 node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
812 next0 = SNAT_OUT2IN_NEXT_DROP;
819 if (PREDICT_FALSE (ip4_is_fragment (ip0)))
821 next0 = SNAT_OUT2IN_NEXT_REASS;
826 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
828 next0 = icmp_out2in_slow_path
829 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
830 next0, now, thread_index, &s0);
835 key0.addr = ip0->dst_address;
836 key0.port = udp0->dst_port;
837 key0.protocol = proto0;
838 key0.fib_index = rx_fib_index0;
840 kv0.key = key0.as_u64;
842 if (clib_bihash_search_8_8
843 (&sm->per_thread_data[thread_index].out2in, &kv0, &value0))
845 /* Try to match static mapping by external address and port,
846 destination address and port in packet */
847 if (snat_static_mapping_match
848 (sm, key0, &sm0, 1, 0, 0, 0, 0, &identity_nat0))
851 * Send DHCP packets to the ipv4 stack, or we won't
852 * be able to use dhcp client on the outside interface
854 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_UDP
855 && (udp0->dst_port ==
857 (UDP_DST_PORT_dhcp_to_client))))
859 vnet_feature_next (&next0, b0);
863 if (!sm->forwarding_enabled)
866 node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
867 next0 = SNAT_OUT2IN_NEXT_DROP;
872 if (PREDICT_FALSE (identity_nat0))
875 /* Create session initiated by host from external network */
876 s0 = create_session_for_static_mapping (sm, b0, sm0, key0, node,
880 next0 = SNAT_OUT2IN_NEXT_DROP;
886 pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
889 old_addr0 = ip0->dst_address.as_u32;
890 ip0->dst_address = s0->in2out.addr;
891 new_addr0 = ip0->dst_address.as_u32;
892 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
894 sum0 = ip0->checksum;
895 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
897 dst_address /* changed member */ );
898 ip0->checksum = ip_csum_fold (sum0);
900 old_port0 = udp0->dst_port;
901 new_port0 = udp0->dst_port = s0->in2out.port;
903 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
905 sum0 = tcp0->checksum;
906 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
908 dst_address /* changed member */ );
910 sum0 = ip_csum_update (sum0, old_port0, new_port0,
911 ip4_header_t /* cheat */ ,
912 length /* changed member */ );
913 tcp0->checksum = ip_csum_fold (sum0);
918 if (PREDICT_FALSE (udp0->checksum))
920 sum0 = udp0->checksum;
921 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
923 dst_address /* changed member */ );
924 sum0 = ip_csum_update (sum0, old_port0, new_port0,
925 ip4_header_t /* cheat */ ,
926 length /* changed member */ );
927 udp0->checksum = ip_csum_fold (sum0);
933 nat44_session_update_counters (s0, now,
934 vlib_buffer_length_in_chain (vm, b0),
936 /* Per-user LRU list maintenance */
937 nat44_session_update_lru (sm, s0, thread_index);
940 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
941 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
943 snat_out2in_trace_t *t =
944 vlib_add_trace (vm, node, b0, sizeof (*t));
945 t->sw_if_index = sw_if_index0;
946 t->next_index = next0;
947 t->session_index = ~0;
950 s0 - sm->per_thread_data[thread_index].sessions;
953 pkts_processed += next0 == SNAT_OUT2IN_NEXT_LOOKUP;
956 ip1 = vlib_buffer_get_current (b1);
957 udp1 = ip4_next_header (ip1);
958 tcp1 = (tcp_header_t *) udp1;
959 icmp1 = (icmp46_header_t *) udp1;
961 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
962 rx_fib_index1 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
965 if (PREDICT_FALSE (ip1->ttl == 1))
967 vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
968 icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
969 ICMP4_time_exceeded_ttl_exceeded_in_transit,
971 next1 = SNAT_OUT2IN_NEXT_ICMP_ERROR;
975 proto1 = ip_proto_to_snat_proto (ip1->protocol);
977 if (PREDICT_FALSE (proto1 == ~0))
979 if (nat_out2in_sm_unknown_proto (sm, b1, ip1, rx_fib_index1))
981 if (!sm->forwarding_enabled)
984 node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
985 next1 = SNAT_OUT2IN_NEXT_DROP;
992 if (PREDICT_FALSE (ip4_is_fragment (ip1)))
994 next1 = SNAT_OUT2IN_NEXT_REASS;
999 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1001 next1 = icmp_out2in_slow_path
1002 (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
1003 next1, now, thread_index, &s1);
1008 key1.addr = ip1->dst_address;
1009 key1.port = udp1->dst_port;
1010 key1.protocol = proto1;
1011 key1.fib_index = rx_fib_index1;
1013 kv1.key = key1.as_u64;
1015 if (clib_bihash_search_8_8
1016 (&sm->per_thread_data[thread_index].out2in, &kv1, &value1))
1018 /* Try to match static mapping by external address and port,
1019 destination address and port in packet */
1020 if (snat_static_mapping_match
1021 (sm, key1, &sm1, 1, 0, 0, 0, 0, &identity_nat1))
1024 * Send DHCP packets to the ipv4 stack, or we won't
1025 * be able to use dhcp client on the outside interface
1027 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_UDP
1028 && (udp1->dst_port ==
1029 clib_host_to_net_u16
1030 (UDP_DST_PORT_dhcp_to_client))))
1032 vnet_feature_next (&next1, b1);
1036 if (!sm->forwarding_enabled)
1039 node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
1040 next1 = SNAT_OUT2IN_NEXT_DROP;
1045 if (PREDICT_FALSE (identity_nat1))
1048 /* Create session initiated by host from external network */
1049 s1 = create_session_for_static_mapping (sm, b1, sm1, key1, node,
1053 next1 = SNAT_OUT2IN_NEXT_DROP;
1059 pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1062 old_addr1 = ip1->dst_address.as_u32;
1063 ip1->dst_address = s1->in2out.addr;
1064 new_addr1 = ip1->dst_address.as_u32;
1065 vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->in2out.fib_index;
1067 sum1 = ip1->checksum;
1068 sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1070 dst_address /* changed member */ );
1071 ip1->checksum = ip_csum_fold (sum1);
1073 old_port1 = udp1->dst_port;
1074 new_port1 = udp1->dst_port = s1->in2out.port;
1076 if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1078 sum1 = tcp1->checksum;
1079 sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1081 dst_address /* changed member */ );
1083 sum1 = ip_csum_update (sum1, old_port1, new_port1,
1084 ip4_header_t /* cheat */ ,
1085 length /* changed member */ );
1086 tcp1->checksum = ip_csum_fold (sum1);
1091 if (PREDICT_FALSE (udp1->checksum))
1093 sum1 = udp1->checksum;
1094 sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1096 dst_address /* changed member */ );
1097 sum1 = ip_csum_update (sum1, old_port1, new_port1,
1098 ip4_header_t /* cheat */ ,
1099 length /* changed member */ );
1100 udp1->checksum = ip_csum_fold (sum1);
1106 nat44_session_update_counters (s1, now,
1107 vlib_buffer_length_in_chain (vm, b1),
1109 /* Per-user LRU list maintenance */
1110 nat44_session_update_lru (sm, s1, thread_index);
1113 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1114 && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1116 snat_out2in_trace_t *t =
1117 vlib_add_trace (vm, node, b1, sizeof (*t));
1118 t->sw_if_index = sw_if_index1;
1119 t->next_index = next1;
1120 t->session_index = ~0;
1123 s1 - sm->per_thread_data[thread_index].sessions;
1126 pkts_processed += next1 == SNAT_OUT2IN_NEXT_LOOKUP;
1128 /* verify speculative enqueues, maybe switch current next frame */
1129 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1130 to_next, n_left_to_next,
1131 bi0, bi1, next0, next1);
1134 while (n_left_from > 0 && n_left_to_next > 0)
1138 u32 next0 = SNAT_OUT2IN_NEXT_LOOKUP;
1142 u32 new_addr0, old_addr0;
1143 u16 new_port0, old_port0;
1146 icmp46_header_t *icmp0;
1147 snat_session_key_t key0, sm0;
1150 snat_session_t *s0 = 0;
1151 clib_bihash_kv_8_8_t kv0, value0;
1154 /* speculatively enqueue b0 to the current next frame */
1160 n_left_to_next -= 1;
1162 b0 = vlib_get_buffer (vm, bi0);
1164 vnet_buffer (b0)->snat.flags = 0;
1166 ip0 = vlib_buffer_get_current (b0);
1167 udp0 = ip4_next_header (ip0);
1168 tcp0 = (tcp_header_t *) udp0;
1169 icmp0 = (icmp46_header_t *) udp0;
1171 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1172 rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
1175 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1177 if (PREDICT_FALSE (proto0 == ~0))
1179 if (nat_out2in_sm_unknown_proto (sm, b0, ip0, rx_fib_index0))
1181 if (!sm->forwarding_enabled)
1184 node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
1185 next0 = SNAT_OUT2IN_NEXT_DROP;
1192 if (PREDICT_FALSE (ip0->ttl == 1))
1194 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1195 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1196 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1198 next0 = SNAT_OUT2IN_NEXT_ICMP_ERROR;
1202 if (PREDICT_FALSE (ip4_is_fragment (ip0)))
1204 next0 = SNAT_OUT2IN_NEXT_REASS;
1209 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1211 next0 = icmp_out2in_slow_path
1212 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1213 next0, now, thread_index, &s0);
1218 key0.addr = ip0->dst_address;
1219 key0.port = udp0->dst_port;
1220 key0.protocol = proto0;
1221 key0.fib_index = rx_fib_index0;
1223 kv0.key = key0.as_u64;
1225 if (clib_bihash_search_8_8
1226 (&sm->per_thread_data[thread_index].out2in, &kv0, &value0))
1228 /* Try to match static mapping by external address and port,
1229 destination address and port in packet */
1230 if (snat_static_mapping_match
1231 (sm, key0, &sm0, 1, 0, 0, 0, 0, &identity_nat0))
1234 * Send DHCP packets to the ipv4 stack, or we won't
1235 * be able to use dhcp client on the outside interface
1237 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_UDP
1238 && (udp0->dst_port ==
1239 clib_host_to_net_u16
1240 (UDP_DST_PORT_dhcp_to_client))))
1242 vnet_feature_next (&next0, b0);
1246 if (!sm->forwarding_enabled)
1249 node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
1250 next0 = SNAT_OUT2IN_NEXT_DROP;
1255 if (PREDICT_FALSE (identity_nat0))
1258 /* Create session initiated by host from external network */
1259 s0 = create_session_for_static_mapping (sm, b0, sm0, key0, node,
1263 next0 = SNAT_OUT2IN_NEXT_DROP;
1269 pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1272 old_addr0 = ip0->dst_address.as_u32;
1273 ip0->dst_address = s0->in2out.addr;
1274 new_addr0 = ip0->dst_address.as_u32;
1275 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
1277 sum0 = ip0->checksum;
1278 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1280 dst_address /* changed member */ );
1281 ip0->checksum = ip_csum_fold (sum0);
1283 old_port0 = udp0->dst_port;
1284 new_port0 = udp0->dst_port = s0->in2out.port;
1286 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1288 sum0 = tcp0->checksum;
1289 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1291 dst_address /* changed member */ );
1293 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1294 ip4_header_t /* cheat */ ,
1295 length /* changed member */ );
1296 tcp0->checksum = ip_csum_fold (sum0);
1301 if (PREDICT_FALSE (udp0->checksum))
1303 sum0 = udp0->checksum;
1304 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1306 dst_address /* changed member */ );
1307 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1308 ip4_header_t /* cheat */ ,
1309 length /* changed member */ );
1310 udp0->checksum = ip_csum_fold (sum0);
1316 nat44_session_update_counters (s0, now,
1317 vlib_buffer_length_in_chain (vm, b0),
1319 /* Per-user LRU list maintenance */
1320 nat44_session_update_lru (sm, s0, thread_index);
1323 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1324 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1326 snat_out2in_trace_t *t =
1327 vlib_add_trace (vm, node, b0, sizeof (*t));
1328 t->sw_if_index = sw_if_index0;
1329 t->next_index = next0;
1330 t->session_index = ~0;
1333 s0 - sm->per_thread_data[thread_index].sessions;
1336 pkts_processed += next0 == SNAT_OUT2IN_NEXT_LOOKUP;
1338 /* verify speculative enqueue, maybe switch current next frame */
1339 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1340 to_next, n_left_to_next,
1344 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1347 vlib_node_increment_counter (vm, sm->out2in_node_index,
1348 SNAT_OUT2IN_ERROR_OUT2IN_PACKETS,
1350 vlib_node_increment_counter (vm, sm->out2in_node_index,
1351 SNAT_OUT2IN_ERROR_TCP_PACKETS, tcp_packets);
1352 vlib_node_increment_counter (vm, sm->out2in_node_index,
1353 SNAT_OUT2IN_ERROR_UDP_PACKETS, udp_packets);
1354 vlib_node_increment_counter (vm, sm->out2in_node_index,
1355 SNAT_OUT2IN_ERROR_ICMP_PACKETS, icmp_packets);
1356 vlib_node_increment_counter (vm, sm->out2in_node_index,
1357 SNAT_OUT2IN_ERROR_OTHER_PACKETS,
1359 vlib_node_increment_counter (vm, sm->out2in_node_index,
1360 SNAT_OUT2IN_ERROR_FRAGMENTS, fragments);
1362 return frame->n_vectors;
1366 VLIB_REGISTER_NODE (snat_out2in_node) = {
1367 .name = "nat44-out2in",
1368 .vector_size = sizeof (u32),
1369 .format_trace = format_snat_out2in_trace,
1370 .type = VLIB_NODE_TYPE_INTERNAL,
1372 .n_errors = ARRAY_LEN(snat_out2in_error_strings),
1373 .error_strings = snat_out2in_error_strings,
1375 .runtime_data_bytes = sizeof (snat_runtime_t),
1377 .n_next_nodes = SNAT_OUT2IN_N_NEXT,
1379 /* edit / add dispositions here */
1381 [SNAT_OUT2IN_NEXT_DROP] = "error-drop",
1382 [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
1383 [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1384 [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
1389 VLIB_NODE_FN (nat44_out2in_reass_node) (vlib_main_t * vm,
1390 vlib_node_runtime_t * node,
1391 vlib_frame_t * frame)
1393 u32 n_left_from, *from, *to_next;
1394 snat_out2in_next_t next_index;
1395 u32 pkts_processed = 0, cached_fragments = 0;
1396 snat_main_t *sm = &snat_main;
1397 f64 now = vlib_time_now (vm);
1398 u32 thread_index = vm->thread_index;
1399 snat_main_per_thread_data_t *per_thread_data =
1400 &sm->per_thread_data[thread_index];
1401 u32 *fragments_to_drop = 0;
1402 u32 *fragments_to_loopback = 0;
1404 from = vlib_frame_vector_args (frame);
1405 n_left_from = frame->n_vectors;
1406 next_index = node->cached_next_index;
1408 while (n_left_from > 0)
1412 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1414 while (n_left_from > 0 && n_left_to_next > 0)
1416 u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
1421 nat_reass_ip4_t *reass0;
1424 icmp46_header_t *icmp0;
1425 snat_session_key_t key0, sm0;
1426 clib_bihash_kv_8_8_t kv0, value0;
1427 snat_session_t *s0 = 0;
1428 u16 old_port0, new_port0;
1432 /* speculatively enqueue b0 to the current next frame */
1438 n_left_to_next -= 1;
1440 b0 = vlib_get_buffer (vm, bi0);
1441 next0 = SNAT_OUT2IN_NEXT_LOOKUP;
1443 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1445 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1448 if (PREDICT_FALSE (nat_reass_is_drop_frag (0)))
1450 next0 = SNAT_OUT2IN_NEXT_DROP;
1451 b0->error = node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT];
1455 ip0 = (ip4_header_t *) vlib_buffer_get_current (b0);
1456 udp0 = ip4_next_header (ip0);
1457 tcp0 = (tcp_header_t *) udp0;
1458 icmp0 = (icmp46_header_t *) udp0;
1459 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1461 reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
1465 1, &fragments_to_drop);
1467 if (PREDICT_FALSE (!reass0))
1469 next0 = SNAT_OUT2IN_NEXT_DROP;
1470 b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_REASS];
1471 nat_elog_notice ("maximum reassemblies exceeded");
1475 if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1477 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1479 next0 = icmp_out2in_slow_path
1480 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1481 next0, now, thread_index, &s0);
1483 if (PREDICT_TRUE (next0 != SNAT_OUT2IN_NEXT_DROP))
1486 reass0->sess_index = s0 - per_thread_data->sessions;
1488 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1489 reass0->thread_index = thread_index;
1490 nat_ip4_reass_get_frags (reass0,
1491 &fragments_to_loopback);
1497 key0.addr = ip0->dst_address;
1498 key0.port = udp0->dst_port;
1499 key0.protocol = proto0;
1500 key0.fib_index = rx_fib_index0;
1501 kv0.key = key0.as_u64;
1503 if (clib_bihash_search_8_8
1504 (&per_thread_data->out2in, &kv0, &value0))
1506 /* Try to match static mapping by external address and port,
1507 destination address and port in packet */
1508 if (snat_static_mapping_match
1509 (sm, key0, &sm0, 1, 0, 0, 0, 0, &identity_nat0))
1512 * Send DHCP packets to the ipv4 stack, or we won't
1513 * be able to use dhcp client on the outside interface
1515 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_UDP
1518 clib_host_to_net_u16
1519 (UDP_DST_PORT_dhcp_to_client))))
1521 vnet_feature_next (&next0, b0);
1525 if (!sm->forwarding_enabled)
1528 node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
1529 next0 = SNAT_OUT2IN_NEXT_DROP;
1533 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1534 nat_ip4_reass_get_frags (reass0,
1535 &fragments_to_loopback);
1540 if (PREDICT_FALSE (identity_nat0))
1543 /* Create session initiated by host from external network */
1545 create_session_for_static_mapping (sm, b0, sm0, key0,
1551 node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
1552 next0 = SNAT_OUT2IN_NEXT_DROP;
1555 reass0->sess_index = s0 - per_thread_data->sessions;
1556 reass0->thread_index = thread_index;
1560 s0 = pool_elt_at_index (per_thread_data->sessions,
1562 reass0->sess_index = value0.value;
1564 nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
1568 if (reass0->flags & NAT_REASS_FLAG_ED_DONT_TRANSLATE)
1570 if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
1572 if (nat_ip4_reass_add_fragment
1573 (thread_index, reass0, bi0, &fragments_to_drop))
1575 b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_FRAG];
1577 ("maximum fragments per reassembly exceeded");
1578 next0 = SNAT_OUT2IN_NEXT_DROP;
1584 s0 = pool_elt_at_index (per_thread_data->sessions,
1585 reass0->sess_index);
1588 old_addr0 = ip0->dst_address.as_u32;
1589 ip0->dst_address = s0->in2out.addr;
1590 new_addr0 = ip0->dst_address.as_u32;
1591 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
1593 sum0 = ip0->checksum;
1594 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1596 dst_address /* changed member */ );
1597 ip0->checksum = ip_csum_fold (sum0);
1599 if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1601 old_port0 = udp0->dst_port;
1602 new_port0 = udp0->dst_port = s0->in2out.port;
1604 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1606 sum0 = tcp0->checksum;
1607 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1609 dst_address /* changed member */ );
1611 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1612 ip4_header_t /* cheat */ ,
1613 length /* changed member */ );
1614 tcp0->checksum = ip_csum_fold (sum0);
1616 else if (udp0->checksum)
1618 sum0 = udp0->checksum;
1619 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1621 dst_address /* changed member */ );
1622 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1623 ip4_header_t /* cheat */ ,
1624 length /* changed member */ );
1625 udp0->checksum = ip_csum_fold (sum0);
1630 nat44_session_update_counters (s0, now,
1631 vlib_buffer_length_in_chain (vm, b0),
1633 /* Per-user LRU list maintenance */
1634 nat44_session_update_lru (sm, s0, thread_index);
1637 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1638 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1640 nat44_reass_trace_t *t =
1641 vlib_add_trace (vm, node, b0, sizeof (*t));
1642 t->cached = cached0;
1643 t->sw_if_index = sw_if_index0;
1644 t->next_index = next0;
1655 pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP;
1657 /* verify speculative enqueue, maybe switch current next frame */
1658 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1659 to_next, n_left_to_next,
1663 if (n_left_from == 0 && vec_len (fragments_to_loopback))
1665 from = vlib_frame_vector_args (frame);
1666 u32 len = vec_len (fragments_to_loopback);
1667 if (len <= VLIB_FRAME_SIZE)
1669 clib_memcpy_fast (from, fragments_to_loopback,
1670 sizeof (u32) * len);
1672 vec_reset_length (fragments_to_loopback);
1676 clib_memcpy_fast (from, fragments_to_loopback +
1677 (len - VLIB_FRAME_SIZE),
1678 sizeof (u32) * VLIB_FRAME_SIZE);
1679 n_left_from = VLIB_FRAME_SIZE;
1680 _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
1685 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1688 vlib_node_increment_counter (vm, sm->out2in_reass_node_index,
1689 SNAT_OUT2IN_ERROR_PROCESSED_FRAGMENTS,
1691 vlib_node_increment_counter (vm, sm->out2in_reass_node_index,
1692 SNAT_OUT2IN_ERROR_CACHED_FRAGMENTS,
1695 nat_send_all_to_node (vm, fragments_to_drop, node,
1696 &node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT],
1697 SNAT_OUT2IN_NEXT_DROP);
1699 vec_free (fragments_to_drop);
1700 vec_free (fragments_to_loopback);
1701 return frame->n_vectors;
1705 VLIB_REGISTER_NODE (nat44_out2in_reass_node) = {
1706 .name = "nat44-out2in-reass",
1707 .vector_size = sizeof (u32),
1708 .format_trace = format_nat44_reass_trace,
1709 .type = VLIB_NODE_TYPE_INTERNAL,
1711 .n_errors = ARRAY_LEN(snat_out2in_error_strings),
1712 .error_strings = snat_out2in_error_strings,
1714 .n_next_nodes = SNAT_OUT2IN_N_NEXT,
1716 /* edit / add dispositions here */
1718 [SNAT_OUT2IN_NEXT_DROP] = "error-drop",
1719 [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
1720 [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1721 [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
1726 VLIB_NODE_FN (snat_out2in_fast_node) (vlib_main_t * vm,
1727 vlib_node_runtime_t * node,
1728 vlib_frame_t * frame)
1730 u32 n_left_from, *from, *to_next;
1731 snat_out2in_next_t next_index;
1732 u32 pkts_processed = 0;
1733 snat_main_t *sm = &snat_main;
1735 from = vlib_frame_vector_args (frame);
1736 n_left_from = frame->n_vectors;
1737 next_index = node->cached_next_index;
1739 while (n_left_from > 0)
1743 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1745 while (n_left_from > 0 && n_left_to_next > 0)
1749 u32 next0 = SNAT_OUT2IN_NEXT_DROP;
1753 u32 new_addr0, old_addr0;
1754 u16 new_port0, old_port0;
1757 icmp46_header_t *icmp0;
1758 snat_session_key_t key0, sm0;
1762 /* speculatively enqueue b0 to the current next frame */
1768 n_left_to_next -= 1;
1770 b0 = vlib_get_buffer (vm, bi0);
1772 ip0 = vlib_buffer_get_current (b0);
1773 udp0 = ip4_next_header (ip0);
1774 tcp0 = (tcp_header_t *) udp0;
1775 icmp0 = (icmp46_header_t *) udp0;
1777 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1779 ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1781 vnet_feature_next (&next0, b0);
1783 if (PREDICT_FALSE (ip0->ttl == 1))
1785 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1786 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1787 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1789 next0 = SNAT_OUT2IN_NEXT_ICMP_ERROR;
1793 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1795 if (PREDICT_FALSE (proto0 == ~0))
1798 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1800 next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0,
1801 rx_fib_index0, node, next0, ~0, 0, 0);
1805 key0.addr = ip0->dst_address;
1806 key0.port = udp0->dst_port;
1807 key0.fib_index = rx_fib_index0;
1809 if (snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0, 0))
1811 b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
1815 new_addr0 = sm0.addr.as_u32;
1816 new_port0 = sm0.port;
1817 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
1818 old_addr0 = ip0->dst_address.as_u32;
1819 ip0->dst_address.as_u32 = new_addr0;
1821 sum0 = ip0->checksum;
1822 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1824 dst_address /* changed member */ );
1825 ip0->checksum = ip_csum_fold (sum0);
1827 if (PREDICT_FALSE (new_port0 != udp0->dst_port))
1829 old_port0 = udp0->dst_port;
1830 udp0->dst_port = new_port0;
1832 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1834 sum0 = tcp0->checksum;
1835 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1837 dst_address /* changed member */ );
1838 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1839 ip4_header_t /* cheat */ ,
1840 length /* changed member */ );
1841 tcp0->checksum = ip_csum_fold (sum0);
1843 else if (udp0->checksum)
1845 sum0 = udp0->checksum;
1846 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1848 dst_address /* changed member */ );
1849 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1850 ip4_header_t /* cheat */ ,
1851 length /* changed member */ );
1852 udp0->checksum = ip_csum_fold (sum0);
1857 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1859 sum0 = tcp0->checksum;
1860 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1862 dst_address /* changed member */ );
1863 tcp0->checksum = ip_csum_fold (sum0);
1865 else if (udp0->checksum)
1867 sum0 = udp0->checksum;
1868 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1870 dst_address /* changed member */ );
1871 udp0->checksum = ip_csum_fold (sum0);
1877 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1878 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1880 snat_out2in_trace_t *t =
1881 vlib_add_trace (vm, node, b0, sizeof (*t));
1882 t->sw_if_index = sw_if_index0;
1883 t->next_index = next0;
1886 pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP;
1888 /* verify speculative enqueue, maybe switch current next frame */
1889 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1890 to_next, n_left_to_next,
1894 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1897 vlib_node_increment_counter (vm, sm->out2in_fast_node_index,
1898 SNAT_OUT2IN_ERROR_OUT2IN_PACKETS,
1900 return frame->n_vectors;
1904 VLIB_REGISTER_NODE (snat_out2in_fast_node) = {
1905 .name = "nat44-out2in-fast",
1906 .vector_size = sizeof (u32),
1907 .format_trace = format_snat_out2in_fast_trace,
1908 .type = VLIB_NODE_TYPE_INTERNAL,
1910 .n_errors = ARRAY_LEN(snat_out2in_error_strings),
1911 .error_strings = snat_out2in_error_strings,
1913 .runtime_data_bytes = sizeof (snat_runtime_t),
1915 .n_next_nodes = SNAT_OUT2IN_N_NEXT,
1917 /* edit / add dispositions here */
1919 [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
1920 [SNAT_OUT2IN_NEXT_DROP] = "error-drop",
1921 [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1922 [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
1928 * fd.io coding-style-patch-verification: ON
1931 * eval: (c-set-style "gnu")