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/nat_syslog.h>
33 #include <nat/nat_ha.h>
35 #include <vppinfra/hash.h>
36 #include <vppinfra/error.h>
37 #include <vppinfra/elog.h>
44 } snat_out2in_trace_t;
46 /* packet trace format function */
48 format_snat_out2in_trace (u8 * s, va_list * args)
50 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
51 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
52 snat_out2in_trace_t *t = va_arg (*args, snat_out2in_trace_t *);
56 "NAT44_OUT2IN: sw_if_index %d, next index %d, session index %d",
57 t->sw_if_index, t->next_index, t->session_index);
62 format_snat_out2in_fast_trace (u8 * s, va_list * args)
64 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
65 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
66 snat_out2in_trace_t *t = va_arg (*args, snat_out2in_trace_t *);
68 s = format (s, "NAT44_OUT2IN_FAST: sw_if_index %d, next index %d",
69 t->sw_if_index, t->next_index);
73 #define foreach_snat_out2in_error \
74 _(UNSUPPORTED_PROTOCOL, "unsupported protocol") \
75 _(OUT2IN_PACKETS, "good out2in packets processed") \
76 _(OUT_OF_PORTS, "out of ports") \
77 _(BAD_ICMP_TYPE, "unsupported ICMP type") \
78 _(NO_TRANSLATION, "no translation") \
79 _(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \
80 _(DROP_FRAGMENT, "drop fragment") \
81 _(MAX_REASS, "maximum reassemblies exceeded") \
82 _(MAX_FRAG, "maximum fragments per reassembly exceeded")\
83 _(TCP_PACKETS, "TCP packets") \
84 _(UDP_PACKETS, "UDP packets") \
85 _(ICMP_PACKETS, "ICMP packets") \
86 _(OTHER_PACKETS, "other protocol packets") \
87 _(FRAGMENTS, "fragments") \
88 _(CACHED_FRAGMENTS, "cached fragments") \
89 _(PROCESSED_FRAGMENTS, "processed fragments")
93 #define _(sym,str) SNAT_OUT2IN_ERROR_##sym,
94 foreach_snat_out2in_error
97 } snat_out2in_error_t;
99 static char *snat_out2in_error_strings[] = {
100 #define _(sym,string) string,
101 foreach_snat_out2in_error
107 SNAT_OUT2IN_NEXT_DROP,
108 SNAT_OUT2IN_NEXT_LOOKUP,
109 SNAT_OUT2IN_NEXT_ICMP_ERROR,
110 SNAT_OUT2IN_NEXT_REASS,
112 } snat_out2in_next_t;
114 #ifndef CLIB_MARCH_VARIANT
116 nat44_o2i_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg)
118 snat_main_t *sm = &snat_main;
119 nat44_is_idle_session_ctx_t *ctx = arg;
121 u64 sess_timeout_time;
122 snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
124 clib_bihash_kv_8_8_t s_kv;
126 s = pool_elt_at_index (tsm->sessions, kv->value);
127 sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
128 if (ctx->now >= sess_timeout_time)
130 s_kv.key = s->in2out.as_u64;
131 if (clib_bihash_add_del_8_8 (&tsm->in2out, &s_kv, 0))
132 nat_elog_warn ("out2in key del failed");
134 snat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
135 s->in2out.addr.as_u32,
136 s->out2in.addr.as_u32,
140 s->in2out.fib_index);
142 nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
143 &s->in2out.addr, s->in2out.port,
144 &s->out2in.addr, s->out2in.port,
147 nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
148 s->ext_host_port, s->out2in.protocol, s->out2in.fib_index,
151 if (!snat_is_session_static (s))
152 snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
155 nat44_delete_session (sm, s, ctx->thread_index);
164 * @brief Create session for static mapping.
166 * Create NAT session initiated by host from external network with static
169 * @param sm NAT main.
170 * @param b0 Vlib buffer.
171 * @param in2out In2out NAT44 session key.
172 * @param out2in Out2in NAT44 session key.
173 * @param node Vlib node.
175 * @returns SNAT session if successfully created otherwise 0.
177 static inline snat_session_t *
178 create_session_for_static_mapping (snat_main_t * sm,
180 snat_session_key_t in2out,
181 snat_session_key_t out2in,
182 vlib_node_runtime_t * node,
183 u32 thread_index, f64 now)
187 clib_bihash_kv_8_8_t kv0;
190 nat44_is_idle_session_ctx_t ctx0;
192 if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index)))
194 b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_SESSIONS_EXCEEDED];
195 nat_elog_notice ("maximum sessions exceeded");
199 ip0 = vlib_buffer_get_current (b0);
200 udp0 = ip4_next_header (ip0);
203 nat_user_get_or_create (sm, &in2out.addr, in2out.fib_index, thread_index);
206 nat_elog_warn ("create NAT user failed");
210 s = nat_session_alloc_or_recycle (sm, u, thread_index, now);
213 nat44_delete_user_with_no_session (sm, u, thread_index);
214 nat_elog_warn ("create NAT session failed");
218 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
219 s->ext_host_addr.as_u32 = ip0->src_address.as_u32;
220 s->ext_host_port = udp0->src_port;
221 user_session_increment (sm, u, 1 /* static */ );
224 s->in2out.protocol = out2in.protocol;
226 /* Add to translation hashes */
228 ctx0.thread_index = thread_index;
229 kv0.key = s->in2out.as_u64;
230 kv0.value = s - sm->per_thread_data[thread_index].sessions;
231 if (clib_bihash_add_or_overwrite_stale_8_8
232 (&sm->per_thread_data[thread_index].in2out, &kv0,
233 nat44_i2o_is_idle_session_cb, &ctx0))
234 nat_elog_notice ("in2out key add failed");
236 kv0.key = s->out2in.as_u64;
238 if (clib_bihash_add_or_overwrite_stale_8_8
239 (&sm->per_thread_data[thread_index].out2in, &kv0,
240 nat44_o2i_is_idle_session_cb, &ctx0))
241 nat_elog_notice ("out2in key add failed");
244 snat_ipfix_logging_nat44_ses_create (thread_index,
245 s->in2out.addr.as_u32,
246 s->out2in.addr.as_u32,
249 s->out2in.port, s->in2out.fib_index);
251 nat_syslog_nat44_apmadd (s->user_index, s->in2out.fib_index,
252 &s->in2out.addr, s->in2out.port, &s->out2in.addr,
253 s->out2in.port, s->in2out.protocol);
255 nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
256 s->out2in.port, &s->ext_host_addr, s->ext_host_port,
257 &s->ext_host_nat_addr, s->ext_host_nat_port,
258 s->in2out.protocol, s->in2out.fib_index, s->flags,
264 #ifndef CLIB_MARCH_VARIANT
266 snat_out2in_error_t icmp_get_key (ip4_header_t * ip0,
267 snat_session_key_t * p_key0)
269 icmp46_header_t *icmp0;
270 snat_session_key_t key0;
271 icmp_echo_header_t *echo0, *inner_echo0 = 0;
272 ip4_header_t *inner_ip0;
274 icmp46_header_t *inner_icmp0;
276 icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
277 echo0 = (icmp_echo_header_t *) (icmp0 + 1);
279 if (!icmp_is_error_message (icmp0))
281 key0.protocol = SNAT_PROTOCOL_ICMP;
282 key0.addr = ip0->dst_address;
283 key0.port = echo0->identifier;
287 inner_ip0 = (ip4_header_t *) (echo0 + 1);
288 l4_header = ip4_next_header (inner_ip0);
289 key0.protocol = ip_proto_to_snat_proto (inner_ip0->protocol);
290 key0.addr = inner_ip0->src_address;
291 switch (key0.protocol)
293 case SNAT_PROTOCOL_ICMP:
294 inner_icmp0 = (icmp46_header_t *) l4_header;
295 inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
296 key0.port = inner_echo0->identifier;
298 case SNAT_PROTOCOL_UDP:
299 case SNAT_PROTOCOL_TCP:
300 key0.port = ((tcp_udp_header_t *) l4_header)->src_port;
303 return SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL;
307 return -1; /* success */
311 * Get address and port values to be used for ICMP packet translation
312 * and create session if needed
314 * @param[in,out] sm NAT main
315 * @param[in,out] node NAT node runtime
316 * @param[in] thread_index thread index
317 * @param[in,out] b0 buffer containing packet to be translated
318 * @param[out] p_proto protocol used for matching
319 * @param[out] p_value address and port after NAT translation
320 * @param[out] p_dont_translate if packet should not be translated
321 * @param d optional parameter
322 * @param e optional parameter
325 icmp_match_out2in_slow (snat_main_t * sm, vlib_node_runtime_t * node,
326 u32 thread_index, vlib_buffer_t * b0,
327 ip4_header_t * ip0, u8 * p_proto,
328 snat_session_key_t * p_value,
329 u8 * p_dont_translate, void *d, void *e)
331 icmp46_header_t *icmp0;
334 snat_session_key_t key0;
335 snat_session_key_t sm0;
336 snat_session_t *s0 = 0;
337 u8 dont_translate = 0;
338 clib_bihash_kv_8_8_t kv0, value0;
344 icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
345 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
346 rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
350 err = icmp_get_key (ip0, &key0);
353 b0->error = node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
354 next0 = SNAT_OUT2IN_NEXT_DROP;
357 key0.fib_index = rx_fib_index0;
359 kv0.key = key0.as_u64;
361 if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0,
364 /* Try to match static mapping by external address and port,
365 destination address and port in packet */
366 if (snat_static_mapping_match
367 (sm, key0, &sm0, 1, &is_addr_only, 0, 0, 0, &identity_nat))
369 if (!sm->forwarding_enabled)
371 /* Don't NAT packet aimed at the intfc address */
372 if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index0,
373 ip0->dst_address.as_u32)))
378 b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
379 next0 = SNAT_OUT2IN_NEXT_DROP;
389 if (PREDICT_FALSE (icmp0->type != ICMP4_echo_reply &&
390 (icmp0->type != ICMP4_echo_request
393 b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE];
394 next0 = SNAT_OUT2IN_NEXT_DROP;
398 if (PREDICT_FALSE (identity_nat))
403 /* Create session initiated by host from external network */
404 s0 = create_session_for_static_mapping (sm, b0, sm0, key0,
406 vlib_time_now (sm->vlib_main));
410 next0 = SNAT_OUT2IN_NEXT_DROP;
416 if (PREDICT_FALSE (icmp0->type != ICMP4_echo_reply &&
417 icmp0->type != ICMP4_echo_request &&
418 !icmp_is_error_message (icmp0)))
420 b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE];
421 next0 = SNAT_OUT2IN_NEXT_DROP;
425 s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
430 *p_proto = key0.protocol;
432 *p_value = s0->in2out;
433 *p_dont_translate = dont_translate;
435 *(snat_session_t **) d = s0;
440 #ifndef CLIB_MARCH_VARIANT
442 * Get address and port values to be used for ICMP packet translation
444 * @param[in] sm NAT main
445 * @param[in,out] node NAT node runtime
446 * @param[in] thread_index thread index
447 * @param[in,out] b0 buffer containing packet to be translated
448 * @param[out] p_proto protocol used for matching
449 * @param[out] p_value address and port after NAT translation
450 * @param[out] p_dont_translate if packet should not be translated
451 * @param d optional parameter
452 * @param e optional parameter
455 icmp_match_out2in_fast (snat_main_t * sm, vlib_node_runtime_t * node,
456 u32 thread_index, vlib_buffer_t * b0,
457 ip4_header_t * ip0, u8 * p_proto,
458 snat_session_key_t * p_value,
459 u8 * p_dont_translate, void *d, void *e)
461 icmp46_header_t *icmp0;
464 snat_session_key_t key0;
465 snat_session_key_t sm0;
466 u8 dont_translate = 0;
471 icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
472 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
473 rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
475 err = icmp_get_key (ip0, &key0);
478 b0->error = node->errors[err];
479 next0 = SNAT_OUT2IN_NEXT_DROP;
482 key0.fib_index = rx_fib_index0;
484 if (snat_static_mapping_match
485 (sm, key0, &sm0, 1, &is_addr_only, 0, 0, 0, 0))
487 /* Don't NAT packet aimed at the intfc address */
488 if (is_interface_addr (sm, node, sw_if_index0, ip0->dst_address.as_u32))
493 b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
494 next0 = SNAT_OUT2IN_NEXT_DROP;
498 if (PREDICT_FALSE (icmp0->type != ICMP4_echo_reply &&
499 (icmp0->type != ICMP4_echo_request || !is_addr_only) &&
500 !icmp_is_error_message (icmp0)))
502 b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE];
503 next0 = SNAT_OUT2IN_NEXT_DROP;
510 *p_proto = key0.protocol;
511 *p_dont_translate = dont_translate;
516 #ifndef CLIB_MARCH_VARIANT
518 icmp_out2in (snat_main_t * sm,
521 icmp46_header_t * icmp0,
524 vlib_node_runtime_t * node,
525 u32 next0, u32 thread_index, void *d, void *e)
527 snat_session_key_t sm0;
529 icmp_echo_header_t *echo0, *inner_echo0 = 0;
530 ip4_header_t *inner_ip0 = 0;
532 icmp46_header_t *inner_icmp0;
534 u32 new_addr0, old_addr0;
535 u16 old_id0, new_id0;
540 echo0 = (icmp_echo_header_t *) (icmp0 + 1);
542 next0_tmp = sm->icmp_match_out2in_cb (sm, node, thread_index, b0, ip0,
543 &protocol, &sm0, &dont_translate, d,
547 if (next0 == SNAT_OUT2IN_NEXT_DROP || dont_translate)
550 if (PREDICT_TRUE (!ip4_is_fragment (ip0)))
552 sum0 = ip_incremental_checksum_buffer (sm->vlib_main, b0, (u8 *) icmp0 -
554 vlib_buffer_get_current (b0),
555 ntohs (ip0->length) -
556 ip4_header_bytes (ip0), 0);
557 checksum0 = ~ip_csum_fold (sum0);
558 if (checksum0 != 0 && checksum0 != 0xffff)
560 next0 = SNAT_OUT2IN_NEXT_DROP;
565 old_addr0 = ip0->dst_address.as_u32;
566 new_addr0 = ip0->dst_address.as_u32 = sm0.addr.as_u32;
567 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
569 sum0 = ip0->checksum;
570 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
571 dst_address /* changed member */ );
572 ip0->checksum = ip_csum_fold (sum0);
574 if (icmp0->checksum == 0)
575 icmp0->checksum = 0xffff;
577 if (!icmp_is_error_message (icmp0))
580 if (PREDICT_FALSE (new_id0 != echo0->identifier))
582 old_id0 = echo0->identifier;
584 echo0->identifier = new_id0;
586 sum0 = icmp0->checksum;
587 sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
588 identifier /* changed member */ );
589 icmp0->checksum = ip_csum_fold (sum0);
594 inner_ip0 = (ip4_header_t *) (echo0 + 1);
595 l4_header = ip4_next_header (inner_ip0);
597 if (!ip4_header_checksum_is_valid (inner_ip0))
599 next0 = SNAT_OUT2IN_NEXT_DROP;
603 old_addr0 = inner_ip0->src_address.as_u32;
604 inner_ip0->src_address = sm0.addr;
605 new_addr0 = inner_ip0->src_address.as_u32;
607 sum0 = icmp0->checksum;
608 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
609 src_address /* changed member */ );
610 icmp0->checksum = ip_csum_fold (sum0);
614 case SNAT_PROTOCOL_ICMP:
615 inner_icmp0 = (icmp46_header_t *) l4_header;
616 inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
618 old_id0 = inner_echo0->identifier;
620 inner_echo0->identifier = new_id0;
622 sum0 = icmp0->checksum;
623 sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
625 icmp0->checksum = ip_csum_fold (sum0);
627 case SNAT_PROTOCOL_UDP:
628 case SNAT_PROTOCOL_TCP:
629 old_id0 = ((tcp_udp_header_t *) l4_header)->src_port;
631 ((tcp_udp_header_t *) l4_header)->src_port = new_id0;
633 sum0 = icmp0->checksum;
634 sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t,
636 icmp0->checksum = ip_csum_fold (sum0);
649 icmp_out2in_slow_path (snat_main_t * sm,
652 icmp46_header_t * icmp0,
655 vlib_node_runtime_t * node,
657 u32 thread_index, snat_session_t ** p_s0)
659 next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
660 next0, thread_index, p_s0, 0);
661 snat_session_t *s0 = *p_s0;
662 if (PREDICT_TRUE (next0 != SNAT_OUT2IN_NEXT_DROP && s0))
665 nat44_session_update_counters (s0, now,
666 vlib_buffer_length_in_chain
667 (sm->vlib_main, b0), thread_index);
668 /* Per-user LRU list maintenance */
669 nat44_session_update_lru (sm, s0, thread_index);
675 nat_out2in_sm_unknown_proto (snat_main_t * sm,
677 ip4_header_t * ip, u32 rx_fib_index)
679 clib_bihash_kv_8_8_t kv, value;
680 snat_static_mapping_t *m;
681 snat_session_key_t m_key;
682 u32 old_addr, new_addr;
685 m_key.addr = ip->dst_address;
689 kv.key = m_key.as_u64;
690 if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
693 m = pool_elt_at_index (sm->static_mappings, value.value);
695 old_addr = ip->dst_address.as_u32;
696 new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
698 sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
699 ip->checksum = ip_csum_fold (sum);
701 vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
705 VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm,
706 vlib_node_runtime_t * node,
707 vlib_frame_t * frame)
709 u32 n_left_from, *from, *to_next;
710 snat_out2in_next_t next_index;
711 u32 pkts_processed = 0;
712 snat_main_t *sm = &snat_main;
713 f64 now = vlib_time_now (vm);
714 u32 thread_index = vm->thread_index;
715 u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
718 from = vlib_frame_vector_args (frame);
719 n_left_from = frame->n_vectors;
720 next_index = node->cached_next_index;
722 while (n_left_from > 0)
726 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
728 while (n_left_from >= 4 && n_left_to_next >= 2)
731 vlib_buffer_t *b0, *b1;
732 u32 next0 = SNAT_OUT2IN_NEXT_LOOKUP;
733 u32 next1 = SNAT_OUT2IN_NEXT_LOOKUP;
734 u32 sw_if_index0, sw_if_index1;
735 ip4_header_t *ip0, *ip1;
736 ip_csum_t sum0, sum1;
737 u32 new_addr0, old_addr0;
738 u16 new_port0, old_port0;
739 u32 new_addr1, old_addr1;
740 u16 new_port1, old_port1;
741 udp_header_t *udp0, *udp1;
742 tcp_header_t *tcp0, *tcp1;
743 icmp46_header_t *icmp0, *icmp1;
744 snat_session_key_t key0, key1, sm0, sm1;
745 u32 rx_fib_index0, rx_fib_index1;
747 snat_session_t *s0 = 0, *s1 = 0;
748 clib_bihash_kv_8_8_t kv0, kv1, value0, value1;
749 u8 identity_nat0, identity_nat1;
751 /* Prefetch next iteration. */
753 vlib_buffer_t *p2, *p3;
755 p2 = vlib_get_buffer (vm, from[2]);
756 p3 = vlib_get_buffer (vm, from[3]);
758 vlib_prefetch_buffer_header (p2, LOAD);
759 vlib_prefetch_buffer_header (p3, LOAD);
761 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
762 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
765 /* speculatively enqueue b0 and b1 to the current next frame */
766 to_next[0] = bi0 = from[0];
767 to_next[1] = bi1 = from[1];
773 b0 = vlib_get_buffer (vm, bi0);
774 b1 = vlib_get_buffer (vm, bi1);
776 vnet_buffer (b0)->snat.flags = 0;
777 vnet_buffer (b1)->snat.flags = 0;
779 ip0 = vlib_buffer_get_current (b0);
780 udp0 = ip4_next_header (ip0);
781 tcp0 = (tcp_header_t *) udp0;
782 icmp0 = (icmp46_header_t *) udp0;
784 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
785 rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
788 if (PREDICT_FALSE (ip0->ttl == 1))
790 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
791 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
792 ICMP4_time_exceeded_ttl_exceeded_in_transit,
794 next0 = SNAT_OUT2IN_NEXT_ICMP_ERROR;
798 proto0 = ip_proto_to_snat_proto (ip0->protocol);
800 if (PREDICT_FALSE (proto0 == ~0))
802 if (nat_out2in_sm_unknown_proto (sm, b0, ip0, rx_fib_index0))
804 if (!sm->forwarding_enabled)
807 node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
808 next0 = SNAT_OUT2IN_NEXT_DROP;
815 if (PREDICT_FALSE (ip4_is_fragment (ip0)))
817 next0 = SNAT_OUT2IN_NEXT_REASS;
822 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
824 next0 = icmp_out2in_slow_path
825 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
826 next0, now, thread_index, &s0);
831 key0.addr = ip0->dst_address;
832 key0.port = udp0->dst_port;
833 key0.protocol = proto0;
834 key0.fib_index = rx_fib_index0;
836 kv0.key = key0.as_u64;
838 if (clib_bihash_search_8_8
839 (&sm->per_thread_data[thread_index].out2in, &kv0, &value0))
841 /* Try to match static mapping by external address and port,
842 destination address and port in packet */
843 if (snat_static_mapping_match
844 (sm, key0, &sm0, 1, 0, 0, 0, 0, &identity_nat0))
847 * Send DHCP packets to the ipv4 stack, or we won't
848 * be able to use dhcp client on the outside interface
850 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_UDP
851 && (udp0->dst_port ==
853 (UDP_DST_PORT_dhcp_to_client))))
855 vnet_feature_next (&next0, b0);
859 if (!sm->forwarding_enabled)
862 node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
863 next0 = SNAT_OUT2IN_NEXT_DROP;
868 if (PREDICT_FALSE (identity_nat0))
871 /* Create session initiated by host from external network */
872 s0 = create_session_for_static_mapping (sm, b0, sm0, key0, node,
876 next0 = SNAT_OUT2IN_NEXT_DROP;
882 pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
885 old_addr0 = ip0->dst_address.as_u32;
886 ip0->dst_address = s0->in2out.addr;
887 new_addr0 = ip0->dst_address.as_u32;
888 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
890 sum0 = ip0->checksum;
891 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
893 dst_address /* changed member */ );
894 ip0->checksum = ip_csum_fold (sum0);
896 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
898 old_port0 = tcp0->dst_port;
899 tcp0->dst_port = s0->in2out.port;
900 new_port0 = tcp0->dst_port;
902 sum0 = tcp0->checksum;
903 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
905 dst_address /* changed member */ );
907 sum0 = ip_csum_update (sum0, old_port0, new_port0,
908 ip4_header_t /* cheat */ ,
909 length /* changed member */ );
910 tcp0->checksum = ip_csum_fold (sum0);
915 if (PREDICT_FALSE (udp0->checksum))
917 old_port0 = udp0->dst_port;
918 new_port0 = udp0->dst_port = s0->in2out.port;
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 if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1075 old_port1 = tcp1->dst_port;
1076 tcp1->dst_port = s1->in2out.port;
1077 new_port1 = tcp1->dst_port;
1079 sum1 = tcp1->checksum;
1080 sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1082 dst_address /* changed member */ );
1084 sum1 = ip_csum_update (sum1, old_port1, new_port1,
1085 ip4_header_t /* cheat */ ,
1086 length /* changed member */ );
1087 tcp1->checksum = ip_csum_fold (sum1);
1092 if (PREDICT_FALSE (udp1->checksum))
1094 old_port1 = udp1->dst_port;
1095 new_port1 = udp1->dst_port = s1->in2out.port;
1097 sum1 = udp1->checksum;
1098 sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1100 dst_address /* changed member */ );
1101 sum1 = ip_csum_update (sum1, old_port1, new_port1,
1102 ip4_header_t /* cheat */ ,
1103 length /* changed member */ );
1104 udp1->checksum = ip_csum_fold (sum1);
1110 nat44_session_update_counters (s1, now,
1111 vlib_buffer_length_in_chain (vm, b1),
1113 /* Per-user LRU list maintenance */
1114 nat44_session_update_lru (sm, s1, thread_index);
1117 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1118 && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1120 snat_out2in_trace_t *t =
1121 vlib_add_trace (vm, node, b1, sizeof (*t));
1122 t->sw_if_index = sw_if_index1;
1123 t->next_index = next1;
1124 t->session_index = ~0;
1127 s1 - sm->per_thread_data[thread_index].sessions;
1130 pkts_processed += next1 == SNAT_OUT2IN_NEXT_LOOKUP;
1132 /* verify speculative enqueues, maybe switch current next frame */
1133 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1134 to_next, n_left_to_next,
1135 bi0, bi1, next0, next1);
1138 while (n_left_from > 0 && n_left_to_next > 0)
1142 u32 next0 = SNAT_OUT2IN_NEXT_LOOKUP;
1146 u32 new_addr0, old_addr0;
1147 u16 new_port0, old_port0;
1150 icmp46_header_t *icmp0;
1151 snat_session_key_t key0, sm0;
1154 snat_session_t *s0 = 0;
1155 clib_bihash_kv_8_8_t kv0, value0;
1158 /* speculatively enqueue b0 to the current next frame */
1164 n_left_to_next -= 1;
1166 b0 = vlib_get_buffer (vm, bi0);
1168 vnet_buffer (b0)->snat.flags = 0;
1170 ip0 = vlib_buffer_get_current (b0);
1171 udp0 = ip4_next_header (ip0);
1172 tcp0 = (tcp_header_t *) udp0;
1173 icmp0 = (icmp46_header_t *) udp0;
1175 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1176 rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
1179 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1181 if (PREDICT_FALSE (proto0 == ~0))
1183 if (nat_out2in_sm_unknown_proto (sm, b0, ip0, rx_fib_index0))
1185 if (!sm->forwarding_enabled)
1188 node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
1189 next0 = SNAT_OUT2IN_NEXT_DROP;
1196 if (PREDICT_FALSE (ip0->ttl == 1))
1198 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1199 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1200 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1202 next0 = SNAT_OUT2IN_NEXT_ICMP_ERROR;
1206 if (PREDICT_FALSE (ip4_is_fragment (ip0)))
1208 next0 = SNAT_OUT2IN_NEXT_REASS;
1213 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1215 next0 = icmp_out2in_slow_path
1216 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1217 next0, now, thread_index, &s0);
1222 key0.addr = ip0->dst_address;
1223 key0.port = udp0->dst_port;
1224 key0.protocol = proto0;
1225 key0.fib_index = rx_fib_index0;
1227 kv0.key = key0.as_u64;
1229 if (clib_bihash_search_8_8
1230 (&sm->per_thread_data[thread_index].out2in, &kv0, &value0))
1232 /* Try to match static mapping by external address and port,
1233 destination address and port in packet */
1234 if (snat_static_mapping_match
1235 (sm, key0, &sm0, 1, 0, 0, 0, 0, &identity_nat0))
1238 * Send DHCP packets to the ipv4 stack, or we won't
1239 * be able to use dhcp client on the outside interface
1241 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_UDP
1242 && (udp0->dst_port ==
1243 clib_host_to_net_u16
1244 (UDP_DST_PORT_dhcp_to_client))))
1246 vnet_feature_next (&next0, b0);
1250 if (!sm->forwarding_enabled)
1253 node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
1254 next0 = SNAT_OUT2IN_NEXT_DROP;
1259 if (PREDICT_FALSE (identity_nat0))
1262 /* Create session initiated by host from external network */
1263 s0 = create_session_for_static_mapping (sm, b0, sm0, key0, node,
1267 next0 = SNAT_OUT2IN_NEXT_DROP;
1273 pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1276 old_addr0 = ip0->dst_address.as_u32;
1277 ip0->dst_address = s0->in2out.addr;
1278 new_addr0 = ip0->dst_address.as_u32;
1279 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
1281 sum0 = ip0->checksum;
1282 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1284 dst_address /* changed member */ );
1285 ip0->checksum = ip_csum_fold (sum0);
1287 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1289 old_port0 = tcp0->dst_port;
1290 tcp0->dst_port = s0->in2out.port;
1291 new_port0 = tcp0->dst_port;
1293 sum0 = tcp0->checksum;
1294 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1296 dst_address /* changed member */ );
1298 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1299 ip4_header_t /* cheat */ ,
1300 length /* changed member */ );
1301 tcp0->checksum = ip_csum_fold (sum0);
1306 if (PREDICT_FALSE (udp0->checksum))
1308 old_port0 = udp0->dst_port;
1309 new_port0 = udp0->dst_port = s0->in2out.port;
1311 sum0 = udp0->checksum;
1312 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1314 dst_address /* changed member */ );
1315 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1316 ip4_header_t /* cheat */ ,
1317 length /* changed member */ );
1318 udp0->checksum = ip_csum_fold (sum0);
1324 nat44_session_update_counters (s0, now,
1325 vlib_buffer_length_in_chain (vm, b0),
1327 /* Per-user LRU list maintenance */
1328 nat44_session_update_lru (sm, s0, thread_index);
1331 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1332 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1334 snat_out2in_trace_t *t =
1335 vlib_add_trace (vm, node, b0, sizeof (*t));
1336 t->sw_if_index = sw_if_index0;
1337 t->next_index = next0;
1338 t->session_index = ~0;
1341 s0 - sm->per_thread_data[thread_index].sessions;
1344 pkts_processed += next0 == SNAT_OUT2IN_NEXT_LOOKUP;
1346 /* verify speculative enqueue, maybe switch current next frame */
1347 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1348 to_next, n_left_to_next,
1352 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1355 vlib_node_increment_counter (vm, sm->out2in_node_index,
1356 SNAT_OUT2IN_ERROR_OUT2IN_PACKETS,
1358 vlib_node_increment_counter (vm, sm->out2in_node_index,
1359 SNAT_OUT2IN_ERROR_TCP_PACKETS, tcp_packets);
1360 vlib_node_increment_counter (vm, sm->out2in_node_index,
1361 SNAT_OUT2IN_ERROR_UDP_PACKETS, udp_packets);
1362 vlib_node_increment_counter (vm, sm->out2in_node_index,
1363 SNAT_OUT2IN_ERROR_ICMP_PACKETS, icmp_packets);
1364 vlib_node_increment_counter (vm, sm->out2in_node_index,
1365 SNAT_OUT2IN_ERROR_OTHER_PACKETS,
1367 vlib_node_increment_counter (vm, sm->out2in_node_index,
1368 SNAT_OUT2IN_ERROR_FRAGMENTS, fragments);
1370 return frame->n_vectors;
1374 VLIB_REGISTER_NODE (snat_out2in_node) = {
1375 .name = "nat44-out2in",
1376 .vector_size = sizeof (u32),
1377 .format_trace = format_snat_out2in_trace,
1378 .type = VLIB_NODE_TYPE_INTERNAL,
1380 .n_errors = ARRAY_LEN(snat_out2in_error_strings),
1381 .error_strings = snat_out2in_error_strings,
1383 .runtime_data_bytes = sizeof (snat_runtime_t),
1385 .n_next_nodes = SNAT_OUT2IN_N_NEXT,
1387 /* edit / add dispositions here */
1389 [SNAT_OUT2IN_NEXT_DROP] = "error-drop",
1390 [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
1391 [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1392 [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
1397 VLIB_NODE_FN (nat44_out2in_reass_node) (vlib_main_t * vm,
1398 vlib_node_runtime_t * node,
1399 vlib_frame_t * frame)
1401 u32 n_left_from, *from, *to_next;
1402 snat_out2in_next_t next_index;
1403 u32 pkts_processed = 0, cached_fragments = 0;
1404 snat_main_t *sm = &snat_main;
1405 f64 now = vlib_time_now (vm);
1406 u32 thread_index = vm->thread_index;
1407 snat_main_per_thread_data_t *per_thread_data =
1408 &sm->per_thread_data[thread_index];
1409 u32 *fragments_to_drop = 0;
1410 u32 *fragments_to_loopback = 0;
1412 from = vlib_frame_vector_args (frame);
1413 n_left_from = frame->n_vectors;
1414 next_index = node->cached_next_index;
1416 while (n_left_from > 0)
1420 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1422 while (n_left_from > 0 && n_left_to_next > 0)
1424 u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
1429 nat_reass_ip4_t *reass0;
1432 icmp46_header_t *icmp0;
1433 snat_session_key_t key0, sm0;
1434 clib_bihash_kv_8_8_t kv0, value0;
1435 snat_session_t *s0 = 0;
1436 u16 old_port0, new_port0;
1440 /* speculatively enqueue b0 to the current next frame */
1446 n_left_to_next -= 1;
1448 b0 = vlib_get_buffer (vm, bi0);
1449 next0 = SNAT_OUT2IN_NEXT_LOOKUP;
1451 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1453 fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
1456 if (PREDICT_FALSE (nat_reass_is_drop_frag (0)))
1458 next0 = SNAT_OUT2IN_NEXT_DROP;
1459 b0->error = node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT];
1463 ip0 = (ip4_header_t *) vlib_buffer_get_current (b0);
1464 udp0 = ip4_next_header (ip0);
1465 tcp0 = (tcp_header_t *) udp0;
1466 icmp0 = (icmp46_header_t *) udp0;
1467 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1469 reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
1473 1, &fragments_to_drop);
1475 if (PREDICT_FALSE (!reass0))
1477 next0 = SNAT_OUT2IN_NEXT_DROP;
1478 b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_REASS];
1479 nat_elog_notice ("maximum reassemblies exceeded");
1483 if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1485 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1487 next0 = icmp_out2in_slow_path
1488 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1489 next0, now, thread_index, &s0);
1491 if (PREDICT_TRUE (next0 != SNAT_OUT2IN_NEXT_DROP))
1494 reass0->sess_index = s0 - per_thread_data->sessions;
1496 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1497 reass0->thread_index = thread_index;
1498 nat_ip4_reass_get_frags (reass0,
1499 &fragments_to_loopback);
1505 key0.addr = ip0->dst_address;
1506 key0.port = udp0->dst_port;
1507 key0.protocol = proto0;
1508 key0.fib_index = rx_fib_index0;
1509 kv0.key = key0.as_u64;
1511 if (clib_bihash_search_8_8
1512 (&per_thread_data->out2in, &kv0, &value0))
1514 /* Try to match static mapping by external address and port,
1515 destination address and port in packet */
1516 if (snat_static_mapping_match
1517 (sm, key0, &sm0, 1, 0, 0, 0, 0, &identity_nat0))
1520 * Send DHCP packets to the ipv4 stack, or we won't
1521 * be able to use dhcp client on the outside interface
1523 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_UDP
1526 clib_host_to_net_u16
1527 (UDP_DST_PORT_dhcp_to_client))))
1529 vnet_feature_next (&next0, b0);
1533 if (!sm->forwarding_enabled)
1536 node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
1537 next0 = SNAT_OUT2IN_NEXT_DROP;
1541 reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
1542 nat_ip4_reass_get_frags (reass0,
1543 &fragments_to_loopback);
1548 if (PREDICT_FALSE (identity_nat0))
1551 /* Create session initiated by host from external network */
1553 create_session_for_static_mapping (sm, b0, sm0, key0,
1559 node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
1560 next0 = SNAT_OUT2IN_NEXT_DROP;
1563 reass0->sess_index = s0 - per_thread_data->sessions;
1564 reass0->thread_index = thread_index;
1568 s0 = pool_elt_at_index (per_thread_data->sessions,
1570 reass0->sess_index = value0.value;
1572 nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
1576 if (reass0->flags & NAT_REASS_FLAG_ED_DONT_TRANSLATE)
1578 if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
1580 if (nat_ip4_reass_add_fragment
1581 (thread_index, reass0, bi0, &fragments_to_drop))
1583 b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_FRAG];
1585 ("maximum fragments per reassembly exceeded");
1586 next0 = SNAT_OUT2IN_NEXT_DROP;
1592 s0 = pool_elt_at_index (per_thread_data->sessions,
1593 reass0->sess_index);
1596 old_addr0 = ip0->dst_address.as_u32;
1597 ip0->dst_address = s0->in2out.addr;
1598 new_addr0 = ip0->dst_address.as_u32;
1599 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
1601 sum0 = ip0->checksum;
1602 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1604 dst_address /* changed member */ );
1605 ip0->checksum = ip_csum_fold (sum0);
1607 if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
1609 old_port0 = udp0->dst_port;
1610 new_port0 = udp0->dst_port = s0->in2out.port;
1612 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1614 sum0 = tcp0->checksum;
1615 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1617 dst_address /* changed member */ );
1619 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1620 ip4_header_t /* cheat */ ,
1621 length /* changed member */ );
1622 tcp0->checksum = ip_csum_fold (sum0);
1624 else if (udp0->checksum)
1626 sum0 = udp0->checksum;
1627 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1629 dst_address /* changed member */ );
1630 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1631 ip4_header_t /* cheat */ ,
1632 length /* changed member */ );
1633 udp0->checksum = ip_csum_fold (sum0);
1638 nat44_session_update_counters (s0, now,
1639 vlib_buffer_length_in_chain (vm, b0),
1641 /* Per-user LRU list maintenance */
1642 nat44_session_update_lru (sm, s0, thread_index);
1645 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1646 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1648 nat44_reass_trace_t *t =
1649 vlib_add_trace (vm, node, b0, sizeof (*t));
1650 t->cached = cached0;
1651 t->sw_if_index = sw_if_index0;
1652 t->next_index = next0;
1663 pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP;
1665 /* verify speculative enqueue, maybe switch current next frame */
1666 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1667 to_next, n_left_to_next,
1671 if (n_left_from == 0 && vec_len (fragments_to_loopback))
1673 from = vlib_frame_vector_args (frame);
1674 u32 len = vec_len (fragments_to_loopback);
1675 if (len <= VLIB_FRAME_SIZE)
1677 clib_memcpy_fast (from, fragments_to_loopback,
1678 sizeof (u32) * len);
1680 vec_reset_length (fragments_to_loopback);
1684 clib_memcpy_fast (from, fragments_to_loopback +
1685 (len - VLIB_FRAME_SIZE),
1686 sizeof (u32) * VLIB_FRAME_SIZE);
1687 n_left_from = VLIB_FRAME_SIZE;
1688 _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
1693 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1696 vlib_node_increment_counter (vm, sm->out2in_reass_node_index,
1697 SNAT_OUT2IN_ERROR_PROCESSED_FRAGMENTS,
1699 vlib_node_increment_counter (vm, sm->out2in_reass_node_index,
1700 SNAT_OUT2IN_ERROR_CACHED_FRAGMENTS,
1703 nat_send_all_to_node (vm, fragments_to_drop, node,
1704 &node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT],
1705 SNAT_OUT2IN_NEXT_DROP);
1707 vec_free (fragments_to_drop);
1708 vec_free (fragments_to_loopback);
1709 return frame->n_vectors;
1713 VLIB_REGISTER_NODE (nat44_out2in_reass_node) = {
1714 .name = "nat44-out2in-reass",
1715 .vector_size = sizeof (u32),
1716 .format_trace = format_nat44_reass_trace,
1717 .type = VLIB_NODE_TYPE_INTERNAL,
1719 .n_errors = ARRAY_LEN(snat_out2in_error_strings),
1720 .error_strings = snat_out2in_error_strings,
1722 .n_next_nodes = SNAT_OUT2IN_N_NEXT,
1724 /* edit / add dispositions here */
1726 [SNAT_OUT2IN_NEXT_DROP] = "error-drop",
1727 [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
1728 [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1729 [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
1734 VLIB_NODE_FN (snat_out2in_fast_node) (vlib_main_t * vm,
1735 vlib_node_runtime_t * node,
1736 vlib_frame_t * frame)
1738 u32 n_left_from, *from, *to_next;
1739 snat_out2in_next_t next_index;
1740 u32 pkts_processed = 0;
1741 snat_main_t *sm = &snat_main;
1743 from = vlib_frame_vector_args (frame);
1744 n_left_from = frame->n_vectors;
1745 next_index = node->cached_next_index;
1747 while (n_left_from > 0)
1751 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1753 while (n_left_from > 0 && n_left_to_next > 0)
1757 u32 next0 = SNAT_OUT2IN_NEXT_DROP;
1761 u32 new_addr0, old_addr0;
1762 u16 new_port0, old_port0;
1765 icmp46_header_t *icmp0;
1766 snat_session_key_t key0, sm0;
1770 /* speculatively enqueue b0 to the current next frame */
1776 n_left_to_next -= 1;
1778 b0 = vlib_get_buffer (vm, bi0);
1780 ip0 = vlib_buffer_get_current (b0);
1781 udp0 = ip4_next_header (ip0);
1782 tcp0 = (tcp_header_t *) udp0;
1783 icmp0 = (icmp46_header_t *) udp0;
1785 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1787 ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1789 vnet_feature_next (&next0, b0);
1791 if (PREDICT_FALSE (ip0->ttl == 1))
1793 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1794 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1795 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1797 next0 = SNAT_OUT2IN_NEXT_ICMP_ERROR;
1801 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1803 if (PREDICT_FALSE (proto0 == ~0))
1806 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1808 next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0,
1809 rx_fib_index0, node, next0, ~0, 0, 0);
1813 key0.addr = ip0->dst_address;
1814 key0.port = udp0->dst_port;
1815 key0.fib_index = rx_fib_index0;
1817 if (snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0, 0))
1819 b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
1823 new_addr0 = sm0.addr.as_u32;
1824 new_port0 = sm0.port;
1825 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
1826 old_addr0 = ip0->dst_address.as_u32;
1827 ip0->dst_address.as_u32 = new_addr0;
1829 sum0 = ip0->checksum;
1830 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1832 dst_address /* changed member */ );
1833 ip0->checksum = ip_csum_fold (sum0);
1835 if (PREDICT_FALSE (new_port0 != udp0->dst_port))
1837 old_port0 = udp0->dst_port;
1838 udp0->dst_port = new_port0;
1840 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1842 sum0 = tcp0->checksum;
1843 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1845 dst_address /* changed member */ );
1846 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1847 ip4_header_t /* cheat */ ,
1848 length /* changed member */ );
1849 tcp0->checksum = ip_csum_fold (sum0);
1851 else if (udp0->checksum)
1853 sum0 = udp0->checksum;
1854 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1856 dst_address /* changed member */ );
1857 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1858 ip4_header_t /* cheat */ ,
1859 length /* changed member */ );
1860 udp0->checksum = ip_csum_fold (sum0);
1865 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1867 sum0 = tcp0->checksum;
1868 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1870 dst_address /* changed member */ );
1871 tcp0->checksum = ip_csum_fold (sum0);
1873 else if (udp0->checksum)
1875 sum0 = udp0->checksum;
1876 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1878 dst_address /* changed member */ );
1879 udp0->checksum = ip_csum_fold (sum0);
1885 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1886 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1888 snat_out2in_trace_t *t =
1889 vlib_add_trace (vm, node, b0, sizeof (*t));
1890 t->sw_if_index = sw_if_index0;
1891 t->next_index = next0;
1894 pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP;
1896 /* verify speculative enqueue, maybe switch current next frame */
1897 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1898 to_next, n_left_to_next,
1902 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1905 vlib_node_increment_counter (vm, sm->out2in_fast_node_index,
1906 SNAT_OUT2IN_ERROR_OUT2IN_PACKETS,
1908 return frame->n_vectors;
1912 VLIB_REGISTER_NODE (snat_out2in_fast_node) = {
1913 .name = "nat44-out2in-fast",
1914 .vector_size = sizeof (u32),
1915 .format_trace = format_snat_out2in_fast_trace,
1916 .type = VLIB_NODE_TYPE_INTERNAL,
1918 .n_errors = ARRAY_LEN(snat_out2in_error_strings),
1919 .error_strings = snat_out2in_error_strings,
1921 .runtime_data_bytes = sizeof (snat_runtime_t),
1923 .n_next_nodes = SNAT_OUT2IN_N_NEXT,
1925 /* edit / add dispositions here */
1927 [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
1928 [SNAT_OUT2IN_NEXT_DROP] = "error-drop",
1929 [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1930 [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
1936 * fd.io coding-style-patch-verification: ON
1939 * eval: (c-set-style "gnu")