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 if (PREDICT_FALSE (nat44_maximum_sessions_exceeded (sm, thread_index)))
269 b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED];
270 nat_ipfix_logging_max_sessions (thread_index, sm->max_translations);
271 nat_elog_notice ("maximum sessions exceeded");
272 return SNAT_IN2OUT_NEXT_DROP;
275 key1.protocol = key0->protocol;
277 /* First try to match static mapping by local address and port */
278 if (snat_static_mapping_match
279 (sm, *key0, &key1, 0, 0, 0, 0, 0, &identity_nat))
281 /* Try to create dynamic translation */
282 if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index0,
286 [thread_index].snat_thread_index))
288 b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
289 return SNAT_IN2OUT_NEXT_DROP;
294 if (PREDICT_FALSE (identity_nat))
303 u = nat_user_get_or_create (sm, &ip0->src_address, rx_fib_index0,
307 nat_elog_warn ("create NAT user failed");
308 return SNAT_IN2OUT_NEXT_DROP;
311 s = nat_session_alloc_or_recycle (sm, u, thread_index, now);
314 nat44_delete_user_with_no_session (sm, u, thread_index);
315 nat_elog_warn ("create NAT session failed");
316 return SNAT_IN2OUT_NEXT_DROP;
320 s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
321 user_session_increment (sm, u, is_sm);
324 s->out2in.protocol = key0->protocol;
325 s->out2in.fib_index = sm->outside_fib_index;
326 switch (vec_len (sm->outside_fibs))
329 s->out2in.fib_index = sm->outside_fib_index;
332 s->out2in.fib_index = sm->outside_fibs[0].fib_index;
336 vec_foreach (outside_fib, sm->outside_fibs)
338 fei = fib_table_lookup (outside_fib->fib_index, &pfx);
339 if (FIB_NODE_INDEX_INVALID != fei)
341 if (fib_entry_get_resolving_interface (fei) != ~0)
343 s->out2in.fib_index = outside_fib->fib_index;
351 s->ext_host_addr.as_u32 = ip0->dst_address.as_u32;
352 s->ext_host_port = vnet_buffer (b0)->ip.reass.l4_dst_port;
355 /* Add to translation hashes */
357 ctx0.thread_index = thread_index;
358 kv0.key = s->in2out.as_u64;
359 kv0.value = s - sm->per_thread_data[thread_index].sessions;
360 if (clib_bihash_add_or_overwrite_stale_8_8
361 (&sm->per_thread_data[thread_index].in2out, &kv0,
362 nat44_i2o_is_idle_session_cb, &ctx0))
363 nat_elog_notice ("in2out key add failed");
365 kv0.key = s->out2in.as_u64;
366 kv0.value = s - sm->per_thread_data[thread_index].sessions;
368 if (clib_bihash_add_or_overwrite_stale_8_8
369 (&sm->per_thread_data[thread_index].out2in, &kv0,
370 nat44_o2i_is_idle_session_cb, &ctx0))
371 nat_elog_notice ("out2in key add failed");
374 snat_ipfix_logging_nat44_ses_create (thread_index,
375 s->in2out.addr.as_u32,
376 s->out2in.addr.as_u32,
379 s->out2in.port, s->in2out.fib_index);
381 nat_syslog_nat44_apmadd (s->user_index, s->in2out.fib_index,
382 &s->in2out.addr, s->in2out.port, &s->out2in.addr,
383 s->out2in.port, s->in2out.protocol);
385 nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
386 s->out2in.port, &s->ext_host_addr, s->ext_host_port,
387 &s->ext_host_nat_addr, s->ext_host_nat_port,
388 s->in2out.protocol, s->in2out.fib_index, s->flags,
394 #ifndef CLIB_MARCH_VARIANT
396 snat_in2out_error_t icmp_get_key (vlib_buffer_t * b, ip4_header_t * ip0,
397 snat_session_key_t * p_key0)
399 icmp46_header_t *icmp0;
400 snat_session_key_t key0;
401 icmp_echo_header_t *echo0, *inner_echo0 = 0;
402 ip4_header_t *inner_ip0 = 0;
404 icmp46_header_t *inner_icmp0;
406 icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
407 echo0 = (icmp_echo_header_t *) (icmp0 + 1);
409 if (!icmp_type_is_error_message
410 (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
412 key0.protocol = SNAT_PROTOCOL_ICMP;
413 key0.addr = ip0->src_address;
414 key0.port = vnet_buffer (b)->ip.reass.l4_src_port; // TODO fixme should this be dst port?
418 inner_ip0 = (ip4_header_t *) (echo0 + 1);
419 l4_header = ip4_next_header (inner_ip0);
420 key0.protocol = ip_proto_to_snat_proto (inner_ip0->protocol);
421 key0.addr = inner_ip0->dst_address;
422 switch (key0.protocol)
424 case SNAT_PROTOCOL_ICMP:
425 inner_icmp0 = (icmp46_header_t *) l4_header;
426 inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
427 key0.port = inner_echo0->identifier;
429 case SNAT_PROTOCOL_UDP:
430 case SNAT_PROTOCOL_TCP:
431 key0.port = ((tcp_udp_header_t *) l4_header)->dst_port;
434 return SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL;
438 return -1; /* success */
442 * Get address and port values to be used for ICMP packet translation
443 * and create session if needed
445 * @param[in,out] sm NAT main
446 * @param[in,out] node NAT node runtime
447 * @param[in] thread_index thread index
448 * @param[in,out] b0 buffer containing packet to be translated
449 * @param[in,out] ip0 ip header
450 * @param[out] p_proto protocol used for matching
451 * @param[out] p_value address and port after NAT translation
452 * @param[out] p_dont_translate if packet should not be translated
453 * @param d optional parameter
454 * @param e optional parameter
457 icmp_match_in2out_slow (snat_main_t * sm, vlib_node_runtime_t * node,
458 u32 thread_index, vlib_buffer_t * b0,
459 ip4_header_t * ip0, u8 * p_proto,
460 snat_session_key_t * p_value,
461 u8 * p_dont_translate, void *d, void *e)
463 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
466 snat_session_key_t key0;
467 snat_session_t *s0 = 0;
468 u8 dont_translate = 0;
469 clib_bihash_kv_8_8_t kv0, value0;
473 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
474 rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
476 err = icmp_get_key (b0, ip0, &key0);
479 b0->error = node->errors[err];
480 next0 = SNAT_IN2OUT_NEXT_DROP;
483 key0.fib_index = rx_fib_index0;
485 kv0.key = key0.as_u64;
487 if (clib_bihash_search_8_8 (&tsm->in2out, &kv0, &value0))
489 if (vnet_buffer (b0)->sw_if_index[VLIB_TX] != ~0)
491 if (PREDICT_FALSE (nat_not_translate_output_feature (sm, ip0,
504 if (PREDICT_FALSE (snat_not_translate (sm, node, sw_if_index0,
505 ip0, SNAT_PROTOCOL_ICMP,
515 (icmp_type_is_error_message
516 (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags)))
518 b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
519 next0 = SNAT_IN2OUT_NEXT_DROP;
523 next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, &s0, node, next0,
524 thread_index, vlib_time_now (tsm->vlib_main));
526 if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
538 (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
540 && vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
542 && !icmp_type_is_error_message (vnet_buffer (b0)->ip.
543 reass.icmp_type_or_tcp_flags)))
545 b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
546 next0 = SNAT_IN2OUT_NEXT_DROP;
550 s0 = pool_elt_at_index (tsm->sessions, value0.value);
554 *p_proto = key0.protocol;
556 *p_value = s0->out2in;
557 *p_dont_translate = dont_translate;
559 *(snat_session_t **) d = s0;
564 #ifndef CLIB_MARCH_VARIANT
566 * Get address and port values to be used for ICMP packet translation
568 * @param[in] sm NAT main
569 * @param[in,out] node NAT node runtime
570 * @param[in] thread_index thread index
571 * @param[in,out] b0 buffer containing packet to be translated
572 * @param[in,out] ip0 ip header
573 * @param[out] p_proto protocol used for matching
574 * @param[out] p_value address and port after NAT translation
575 * @param[out] p_dont_translate if packet should not be translated
576 * @param d optional parameter
577 * @param e optional parameter
580 icmp_match_in2out_fast (snat_main_t * sm, vlib_node_runtime_t * node,
581 u32 thread_index, vlib_buffer_t * b0,
582 ip4_header_t * ip0, u8 * p_proto,
583 snat_session_key_t * p_value,
584 u8 * p_dont_translate, void *d, void *e)
588 snat_session_key_t key0;
589 snat_session_key_t sm0;
590 u8 dont_translate = 0;
595 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
596 rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
598 err = icmp_get_key (b0, ip0, &key0);
601 b0->error = node->errors[err];
602 next0 = SNAT_IN2OUT_NEXT_DROP;
605 key0.fib_index = rx_fib_index0;
607 if (snat_static_mapping_match
608 (sm, key0, &sm0, 0, &is_addr_only, 0, 0, 0, 0))
610 if (PREDICT_FALSE (snat_not_translate_fast (sm, node, sw_if_index0, ip0,
618 if (icmp_type_is_error_message
619 (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags))
621 next0 = SNAT_IN2OUT_NEXT_DROP;
625 b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
626 next0 = SNAT_IN2OUT_NEXT_DROP;
631 (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_request
632 && (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
633 ICMP4_echo_reply || !is_addr_only)
634 && !icmp_type_is_error_message (vnet_buffer (b0)->ip.
635 reass.icmp_type_or_tcp_flags)))
637 b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
638 next0 = SNAT_IN2OUT_NEXT_DROP;
645 *p_proto = key0.protocol;
646 *p_dont_translate = dont_translate;
651 #ifndef CLIB_MARCH_VARIANT
653 icmp_in2out (snat_main_t * sm,
656 icmp46_header_t * icmp0,
659 vlib_node_runtime_t * node,
660 u32 next0, u32 thread_index, void *d, void *e)
662 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
663 snat_session_key_t sm0;
665 icmp_echo_header_t *echo0, *inner_echo0 = 0;
666 ip4_header_t *inner_ip0;
668 icmp46_header_t *inner_icmp0;
670 u32 new_addr0, old_addr0;
671 u16 old_id0, new_id0;
672 u16 old_checksum0, new_checksum0;
677 echo0 = (icmp_echo_header_t *) (icmp0 + 1);
679 next0_tmp = sm->icmp_match_in2out_cb (sm, node, thread_index, b0, ip0,
680 &protocol, &sm0, &dont_translate, d,
684 if (next0 == SNAT_IN2OUT_NEXT_DROP || dont_translate)
687 if (PREDICT_TRUE (!ip4_is_fragment (ip0)))
690 ip_incremental_checksum_buffer (tsm->vlib_main, b0,
692 (u8 *) 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 snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
823 next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
824 next0, thread_index, p_s0, 0);
825 snat_session_t *s0 = *p_s0;
826 if (PREDICT_TRUE (next0 != SNAT_IN2OUT_NEXT_DROP && s0))
829 nat44_session_update_counters (s0, now,
830 vlib_buffer_length_in_chain
831 (tsm->vlib_main, b0), thread_index);
832 /* Per-user LRU list maintenance */
833 nat44_session_update_lru (sm, s0, thread_index);
839 nat_in2out_sm_unknown_proto (snat_main_t * sm,
841 ip4_header_t * ip, u32 rx_fib_index)
843 clib_bihash_kv_8_8_t kv, value;
844 snat_static_mapping_t *m;
845 snat_session_key_t m_key;
846 u32 old_addr, new_addr;
849 m_key.addr = ip->src_address;
852 m_key.fib_index = rx_fib_index;
853 kv.key = m_key.as_u64;
854 if (clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
857 m = pool_elt_at_index (sm->static_mappings, value.value);
859 old_addr = ip->src_address.as_u32;
860 new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
862 sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
863 ip->checksum = ip_csum_fold (sum);
867 if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
869 vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
870 nat_hairpinning_sm_unknown_proto (sm, b, ip);
877 snat_in2out_node_fn_inline (vlib_main_t * vm,
878 vlib_node_runtime_t * node,
879 vlib_frame_t * frame, int is_slow_path,
880 int is_output_feature)
882 u32 n_left_from, *from, *to_next;
883 snat_in2out_next_t next_index;
884 u32 pkts_processed = 0;
885 snat_main_t *sm = &snat_main;
886 f64 now = vlib_time_now (vm);
887 u32 stats_node_index;
888 u32 thread_index = vm->thread_index;
889 u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets =
892 stats_node_index = is_slow_path ? sm->in2out_slowpath_node_index :
893 sm->in2out_node_index;
895 from = vlib_frame_vector_args (frame);
896 n_left_from = frame->n_vectors;
897 next_index = node->cached_next_index;
899 while (n_left_from > 0)
903 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
905 while (n_left_from >= 4 && n_left_to_next >= 2)
908 vlib_buffer_t *b0, *b1;
910 u32 sw_if_index0, sw_if_index1;
911 ip4_header_t *ip0, *ip1;
912 ip_csum_t sum0, sum1;
913 u32 new_addr0, old_addr0, new_addr1, old_addr1;
914 u16 old_port0, new_port0, old_port1, new_port1;
915 udp_header_t *udp0, *udp1;
916 tcp_header_t *tcp0, *tcp1;
917 icmp46_header_t *icmp0, *icmp1;
918 snat_session_key_t key0, key1;
919 u32 rx_fib_index0, rx_fib_index1;
921 snat_session_t *s0 = 0, *s1 = 0;
922 clib_bihash_kv_8_8_t kv0, value0, kv1, value1;
923 u32 iph_offset0 = 0, iph_offset1 = 0;
925 /* Prefetch next iteration. */
927 vlib_buffer_t *p2, *p3;
929 p2 = vlib_get_buffer (vm, from[2]);
930 p3 = vlib_get_buffer (vm, from[3]);
932 vlib_prefetch_buffer_header (p2, LOAD);
933 vlib_prefetch_buffer_header (p3, LOAD);
935 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
936 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
939 /* speculatively enqueue b0 and b1 to the current next frame */
940 to_next[0] = bi0 = from[0];
941 to_next[1] = bi1 = from[1];
947 b0 = vlib_get_buffer (vm, bi0);
948 b1 = vlib_get_buffer (vm, bi1);
950 if (is_output_feature)
951 iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
953 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
956 udp0 = ip4_next_header (ip0);
957 tcp0 = (tcp_header_t *) udp0;
958 icmp0 = (icmp46_header_t *) udp0;
960 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
961 rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
964 next0 = next1 = SNAT_IN2OUT_NEXT_LOOKUP;
966 if (PREDICT_FALSE (ip0->ttl == 1))
968 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
969 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
970 ICMP4_time_exceeded_ttl_exceeded_in_transit,
972 next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
976 proto0 = ip_proto_to_snat_proto (ip0->protocol);
978 /* Next configured feature, probably ip4-lookup */
981 if (PREDICT_FALSE (proto0 == ~0))
983 if (nat_in2out_sm_unknown_proto
984 (sm, b0, ip0, rx_fib_index0))
986 next0 = SNAT_IN2OUT_NEXT_DROP;
988 node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
994 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
996 next0 = icmp_in2out_slow_path
997 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0,
998 node, next0, now, thread_index, &s0);
1005 if (PREDICT_FALSE (proto0 == ~0))
1007 next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1011 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1013 next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1018 key0.addr = ip0->src_address;
1019 key0.port = vnet_buffer (b0)->ip.reass.l4_src_port;
1020 key0.protocol = proto0;
1021 key0.fib_index = rx_fib_index0;
1023 kv0.key = key0.as_u64;
1026 (clib_bihash_search_8_8
1027 (&sm->per_thread_data[thread_index].in2out, &kv0,
1032 if (is_output_feature)
1035 (nat_not_translate_output_feature
1037 vnet_buffer (b0)->ip.reass.l4_src_port,
1038 vnet_buffer (b0)->ip.reass.l4_dst_port,
1039 thread_index, sw_if_index0)))
1043 * Send DHCP packets to the ipv4 stack, or we won't
1044 * be able to use dhcp client on the outside interface
1047 (proto0 == SNAT_PROTOCOL_UDP
1048 && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
1049 clib_host_to_net_u16
1050 (UDP_DST_PORT_dhcp_to_server))
1051 && ip0->dst_address.as_u32 == 0xffffffff))
1058 (sm, node, sw_if_index0, ip0, proto0,
1059 rx_fib_index0, thread_index)))
1063 next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
1064 &s0, node, next0, thread_index, now);
1065 if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
1068 if (PREDICT_FALSE (!s0))
1073 next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1079 pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1082 b0->flags |= VNET_BUFFER_F_IS_NATED;
1084 old_addr0 = ip0->src_address.as_u32;
1085 ip0->src_address = s0->out2in.addr;
1086 new_addr0 = ip0->src_address.as_u32;
1087 if (!is_output_feature)
1088 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1090 sum0 = ip0->checksum;
1091 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1093 src_address /* changed member */ );
1094 ip0->checksum = ip_csum_fold (sum0);
1097 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1099 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1101 old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1102 new_port0 = udp0->src_port = s0->out2in.port;
1103 sum0 = tcp0->checksum;
1104 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1106 dst_address /* changed member */ );
1107 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1108 ip4_header_t /* cheat */ ,
1109 length /* changed member */ );
1110 mss_clamping (sm, tcp0, &sum0);
1111 tcp0->checksum = ip_csum_fold (sum0);
1117 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1119 if (PREDICT_FALSE (udp0->checksum))
1121 old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1122 new_port0 = udp0->src_port = s0->out2in.port;
1123 sum0 = udp0->checksum;
1124 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */
1127 ip_csum_update (sum0, old_port0, new_port0,
1128 ip4_header_t /* cheat */ ,
1129 length /* changed member */ );
1130 udp0->checksum = ip_csum_fold (sum0);
1137 nat44_session_update_counters (s0, now,
1138 vlib_buffer_length_in_chain (vm, b0),
1140 /* Per-user LRU list maintenance */
1141 nat44_session_update_lru (sm, s0, thread_index);
1144 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1145 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1147 snat_in2out_trace_t *t =
1148 vlib_add_trace (vm, node, b0, sizeof (*t));
1149 t->is_slow_path = is_slow_path;
1150 t->sw_if_index = sw_if_index0;
1151 t->next_index = next0;
1152 t->session_index = ~0;
1155 s0 - sm->per_thread_data[thread_index].sessions;
1158 pkts_processed += next0 == SNAT_IN2OUT_NEXT_LOOKUP;
1160 if (is_output_feature)
1161 iph_offset1 = vnet_buffer (b1)->ip.reass.save_rewrite_length;
1163 ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
1166 udp1 = ip4_next_header (ip1);
1167 tcp1 = (tcp_header_t *) udp1;
1168 icmp1 = (icmp46_header_t *) udp1;
1170 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
1171 rx_fib_index1 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
1174 if (PREDICT_FALSE (ip1->ttl == 1))
1176 vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1177 icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
1178 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1180 next1 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
1184 proto1 = ip_proto_to_snat_proto (ip1->protocol);
1186 /* Next configured feature, probably ip4-lookup */
1189 if (PREDICT_FALSE (proto1 == ~0))
1191 if (nat_in2out_sm_unknown_proto
1192 (sm, b1, ip1, rx_fib_index1))
1194 next1 = SNAT_IN2OUT_NEXT_DROP;
1196 node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
1202 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1204 next1 = icmp_in2out_slow_path
1205 (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
1206 next1, now, thread_index, &s1);
1213 if (PREDICT_FALSE (proto1 == ~0))
1215 next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1219 if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
1221 next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1226 key1.addr = ip1->src_address;
1227 key1.port = vnet_buffer (b1)->ip.reass.l4_src_port;
1228 key1.protocol = proto1;
1229 key1.fib_index = rx_fib_index1;
1231 kv1.key = key1.as_u64;
1234 (clib_bihash_search_8_8
1235 (&sm->per_thread_data[thread_index].in2out, &kv1,
1240 if (is_output_feature)
1243 (nat_not_translate_output_feature
1245 vnet_buffer (b1)->ip.reass.l4_src_port,
1246 vnet_buffer (b1)->ip.reass.l4_dst_port,
1247 thread_index, sw_if_index1)))
1251 * Send DHCP packets to the ipv4 stack, or we won't
1252 * be able to use dhcp client on the outside interface
1255 (proto1 == SNAT_PROTOCOL_UDP
1256 && (vnet_buffer (b1)->ip.reass.l4_dst_port ==
1257 clib_host_to_net_u16
1258 (UDP_DST_PORT_dhcp_to_server))
1259 && ip1->dst_address.as_u32 == 0xffffffff))
1266 (sm, node, sw_if_index1, ip1, proto1,
1267 rx_fib_index1, thread_index)))
1271 next1 = slow_path (sm, b1, ip1, rx_fib_index1, &key1,
1272 &s1, node, next1, thread_index, now);
1273 if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP))
1276 if (PREDICT_FALSE (!s1))
1281 next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1287 pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1290 b1->flags |= VNET_BUFFER_F_IS_NATED;
1292 old_addr1 = ip1->src_address.as_u32;
1293 ip1->src_address = s1->out2in.addr;
1294 new_addr1 = ip1->src_address.as_u32;
1295 if (!is_output_feature)
1296 vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;
1298 sum1 = ip1->checksum;
1299 sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1301 src_address /* changed member */ );
1302 ip1->checksum = ip_csum_fold (sum1);
1304 if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP))
1306 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1308 old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port;
1309 new_port1 = udp1->src_port = s1->out2in.port;
1310 sum1 = tcp1->checksum;
1311 sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
1313 dst_address /* changed member */ );
1314 sum1 = ip_csum_update (sum1, old_port1, new_port1,
1315 ip4_header_t /* cheat */ ,
1316 length /* changed member */ );
1317 mss_clamping (sm, tcp1, &sum1);
1318 tcp1->checksum = ip_csum_fold (sum1);
1324 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1326 if (PREDICT_FALSE (udp1->checksum))
1328 old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port;
1329 new_port1 = udp1->src_port = s1->out2in.port;
1330 sum1 = udp1->checksum;
1331 sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, dst_address /* changed member */
1334 ip_csum_update (sum1, old_port1, new_port1,
1335 ip4_header_t /* cheat */ ,
1336 length /* changed member */ );
1337 udp1->checksum = ip_csum_fold (sum1);
1344 nat44_session_update_counters (s1, now,
1345 vlib_buffer_length_in_chain (vm, b1),
1347 /* Per-user LRU list maintenance */
1348 nat44_session_update_lru (sm, s1, thread_index);
1351 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1352 && (b1->flags & VLIB_BUFFER_IS_TRACED)))
1354 snat_in2out_trace_t *t =
1355 vlib_add_trace (vm, node, b1, sizeof (*t));
1356 t->sw_if_index = sw_if_index1;
1357 t->next_index = next1;
1358 t->session_index = ~0;
1361 s1 - sm->per_thread_data[thread_index].sessions;
1364 pkts_processed += next1 == SNAT_IN2OUT_NEXT_LOOKUP;
1366 /* verify speculative enqueues, maybe switch current next frame */
1367 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1368 to_next, n_left_to_next,
1369 bi0, bi1, next0, next1);
1372 while (n_left_from > 0 && n_left_to_next > 0)
1380 u32 new_addr0, old_addr0;
1381 u16 old_port0, new_port0;
1384 icmp46_header_t *icmp0;
1385 snat_session_key_t key0;
1388 snat_session_t *s0 = 0;
1389 clib_bihash_kv_8_8_t kv0, value0;
1390 u32 iph_offset0 = 0;
1392 /* speculatively enqueue b0 to the current next frame */
1398 n_left_to_next -= 1;
1400 b0 = vlib_get_buffer (vm, bi0);
1401 next0 = SNAT_IN2OUT_NEXT_LOOKUP;
1403 if (is_output_feature)
1404 iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;
1406 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
1409 udp0 = ip4_next_header (ip0);
1410 tcp0 = (tcp_header_t *) udp0;
1411 icmp0 = (icmp46_header_t *) udp0;
1413 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1414 rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
1417 if (PREDICT_FALSE (ip0->ttl == 1))
1419 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1420 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1421 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1423 next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
1427 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1429 /* Next configured feature, probably ip4-lookup */
1432 if (PREDICT_FALSE (proto0 == ~0))
1434 if (nat_in2out_sm_unknown_proto
1435 (sm, b0, ip0, rx_fib_index0))
1437 next0 = SNAT_IN2OUT_NEXT_DROP;
1439 node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
1445 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1447 next0 = icmp_in2out_slow_path
1448 (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
1449 next0, now, thread_index, &s0);
1456 if (PREDICT_FALSE (proto0 == ~0))
1458 next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1462 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1464 next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1469 key0.addr = ip0->src_address;
1470 key0.port = vnet_buffer (b0)->ip.reass.l4_src_port;
1471 key0.protocol = proto0;
1472 key0.fib_index = rx_fib_index0;
1474 kv0.key = key0.as_u64;
1476 if (clib_bihash_search_8_8
1477 (&sm->per_thread_data[thread_index].in2out, &kv0, &value0))
1481 if (is_output_feature)
1484 (nat_not_translate_output_feature
1486 vnet_buffer (b0)->ip.reass.l4_src_port,
1487 vnet_buffer (b0)->ip.reass.l4_dst_port,
1488 thread_index, sw_if_index0)))
1492 * Send DHCP packets to the ipv4 stack, or we won't
1493 * be able to use dhcp client on the outside interface
1496 (proto0 == SNAT_PROTOCOL_UDP
1497 && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
1498 clib_host_to_net_u16
1499 (UDP_DST_PORT_dhcp_to_server))
1500 && ip0->dst_address.as_u32 == 0xffffffff))
1507 (sm, node, sw_if_index0, ip0, proto0,
1508 rx_fib_index0, thread_index)))
1512 next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
1513 &s0, node, next0, thread_index, now);
1515 if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
1518 if (PREDICT_FALSE (!s0))
1523 next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
1529 pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
1532 b0->flags |= VNET_BUFFER_F_IS_NATED;
1534 old_addr0 = ip0->src_address.as_u32;
1535 ip0->src_address = s0->out2in.addr;
1536 new_addr0 = ip0->src_address.as_u32;
1537 if (!is_output_feature)
1538 vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
1540 sum0 = ip0->checksum;
1541 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1543 src_address /* changed member */ );
1544 ip0->checksum = ip_csum_fold (sum0);
1546 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1548 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1550 old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1551 new_port0 = udp0->src_port = s0->out2in.port;
1552 sum0 = tcp0->checksum;
1553 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1555 dst_address /* changed member */ );
1556 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1557 ip4_header_t /* cheat */ ,
1558 length /* changed member */ );
1559 mss_clamping (sm, tcp0, &sum0);
1560 tcp0->checksum = ip_csum_fold (sum0);
1566 if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
1568 if (PREDICT_FALSE (udp0->checksum))
1570 old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
1571 new_port0 = udp0->src_port = s0->out2in.port;
1572 sum0 = udp0->checksum;
1573 sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */
1576 ip_csum_update (sum0, old_port0, new_port0,
1577 ip4_header_t /* cheat */ ,
1578 length /* changed member */ );
1579 udp0->checksum = ip_csum_fold (sum0);
1586 nat44_session_update_counters (s0, now,
1587 vlib_buffer_length_in_chain (vm, b0),
1589 /* Per-user LRU list maintenance */
1590 nat44_session_update_lru (sm, s0, thread_index);
1593 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1594 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1596 snat_in2out_trace_t *t =
1597 vlib_add_trace (vm, node, b0, sizeof (*t));
1598 t->is_slow_path = is_slow_path;
1599 t->sw_if_index = sw_if_index0;
1600 t->next_index = next0;
1601 t->session_index = ~0;
1604 s0 - sm->per_thread_data[thread_index].sessions;
1607 pkts_processed += next0 == SNAT_IN2OUT_NEXT_LOOKUP;
1609 /* verify speculative enqueue, maybe switch current next frame */
1610 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1611 to_next, n_left_to_next,
1615 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1618 vlib_node_increment_counter (vm, stats_node_index,
1619 SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
1621 vlib_node_increment_counter (vm, stats_node_index,
1622 SNAT_IN2OUT_ERROR_TCP_PACKETS, tcp_packets);
1623 vlib_node_increment_counter (vm, stats_node_index,
1624 SNAT_IN2OUT_ERROR_UDP_PACKETS, udp_packets);
1625 vlib_node_increment_counter (vm, stats_node_index,
1626 SNAT_IN2OUT_ERROR_ICMP_PACKETS, icmp_packets);
1627 vlib_node_increment_counter (vm, stats_node_index,
1628 SNAT_IN2OUT_ERROR_OTHER_PACKETS,
1630 vlib_node_increment_counter (vm, stats_node_index,
1631 SNAT_IN2OUT_ERROR_FRAGMENTS, fragments);
1633 return frame->n_vectors;
1636 VLIB_NODE_FN (snat_in2out_node) (vlib_main_t * vm,
1637 vlib_node_runtime_t * node,
1638 vlib_frame_t * frame)
1640 return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */ ,
1645 VLIB_REGISTER_NODE (snat_in2out_node) = {
1646 .name = "nat44-in2out",
1647 .vector_size = sizeof (u32),
1648 .format_trace = format_snat_in2out_trace,
1649 .type = VLIB_NODE_TYPE_INTERNAL,
1651 .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1652 .error_strings = snat_in2out_error_strings,
1654 .runtime_data_bytes = sizeof (snat_runtime_t),
1656 .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1658 /* edit / add dispositions here */
1660 [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1661 [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1662 [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
1663 [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1668 VLIB_NODE_FN (snat_in2out_output_node) (vlib_main_t * vm,
1669 vlib_node_runtime_t * node,
1670 vlib_frame_t * frame)
1672 return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */ ,
1677 VLIB_REGISTER_NODE (snat_in2out_output_node) = {
1678 .name = "nat44-in2out-output",
1679 .vector_size = sizeof (u32),
1680 .format_trace = format_snat_in2out_trace,
1681 .type = VLIB_NODE_TYPE_INTERNAL,
1683 .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1684 .error_strings = snat_in2out_error_strings,
1686 .runtime_data_bytes = sizeof (snat_runtime_t),
1688 .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1690 /* edit / add dispositions here */
1692 [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1693 [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
1694 [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
1695 [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1700 VLIB_NODE_FN (snat_in2out_slowpath_node) (vlib_main_t * vm,
1701 vlib_node_runtime_t * node,
1702 vlib_frame_t * frame)
1704 return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */ ,
1709 VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = {
1710 .name = "nat44-in2out-slowpath",
1711 .vector_size = sizeof (u32),
1712 .format_trace = format_snat_in2out_trace,
1713 .type = VLIB_NODE_TYPE_INTERNAL,
1715 .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1716 .error_strings = snat_in2out_error_strings,
1718 .runtime_data_bytes = sizeof (snat_runtime_t),
1720 .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1722 /* edit / add dispositions here */
1724 [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1725 [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1726 [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
1727 [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1732 VLIB_NODE_FN (snat_in2out_output_slowpath_node) (vlib_main_t * vm,
1733 vlib_node_runtime_t * node,
1734 vlib_frame_t * frame)
1736 return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */ ,
1741 VLIB_REGISTER_NODE (snat_in2out_output_slowpath_node) = {
1742 .name = "nat44-in2out-output-slowpath",
1743 .vector_size = sizeof (u32),
1744 .format_trace = format_snat_in2out_trace,
1745 .type = VLIB_NODE_TYPE_INTERNAL,
1747 .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1748 .error_strings = snat_in2out_error_strings,
1750 .runtime_data_bytes = sizeof (snat_runtime_t),
1752 .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1754 /* edit / add dispositions here */
1756 [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1757 [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
1758 [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
1759 [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1764 VLIB_NODE_FN (snat_in2out_fast_node) (vlib_main_t * vm,
1765 vlib_node_runtime_t * node,
1766 vlib_frame_t * frame)
1768 u32 n_left_from, *from, *to_next;
1769 snat_in2out_next_t next_index;
1770 u32 pkts_processed = 0;
1771 snat_main_t *sm = &snat_main;
1772 u32 stats_node_index;
1774 stats_node_index = sm->in2out_fast_node_index;
1776 from = vlib_frame_vector_args (frame);
1777 n_left_from = frame->n_vectors;
1778 next_index = node->cached_next_index;
1780 while (n_left_from > 0)
1784 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1786 while (n_left_from > 0 && n_left_to_next > 0)
1794 u32 new_addr0, old_addr0;
1795 u16 old_port0, new_port0;
1798 icmp46_header_t *icmp0;
1799 snat_session_key_t key0, sm0;
1803 /* speculatively enqueue b0 to the current next frame */
1809 n_left_to_next -= 1;
1811 b0 = vlib_get_buffer (vm, bi0);
1812 next0 = SNAT_IN2OUT_NEXT_LOOKUP;
1814 ip0 = vlib_buffer_get_current (b0);
1815 udp0 = ip4_next_header (ip0);
1816 tcp0 = (tcp_header_t *) udp0;
1817 icmp0 = (icmp46_header_t *) udp0;
1819 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
1821 ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
1823 if (PREDICT_FALSE (ip0->ttl == 1))
1825 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
1826 icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
1827 ICMP4_time_exceeded_ttl_exceeded_in_transit,
1829 next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
1833 proto0 = ip_proto_to_snat_proto (ip0->protocol);
1835 if (PREDICT_FALSE (proto0 == ~0))
1838 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
1840 next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0,
1841 rx_fib_index0, node, next0, ~0, 0, 0);
1845 key0.addr = ip0->src_address;
1846 key0.protocol = proto0;
1847 key0.port = udp0->src_port;
1848 key0.fib_index = rx_fib_index0;
1850 if (snat_static_mapping_match (sm, key0, &sm0, 0, 0, 0, 0, 0, 0))
1852 b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
1853 next0 = SNAT_IN2OUT_NEXT_DROP;
1857 new_addr0 = sm0.addr.as_u32;
1858 new_port0 = sm0.port;
1859 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
1860 old_addr0 = ip0->src_address.as_u32;
1861 ip0->src_address.as_u32 = new_addr0;
1863 sum0 = ip0->checksum;
1864 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1866 src_address /* changed member */ );
1867 ip0->checksum = ip_csum_fold (sum0);
1869 if (PREDICT_FALSE (new_port0 != udp0->dst_port))
1871 old_port0 = udp0->src_port;
1872 udp0->src_port = new_port0;
1874 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1876 sum0 = tcp0->checksum;
1877 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1879 dst_address /* changed member */ );
1880 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1881 ip4_header_t /* cheat */ ,
1882 length /* changed member */ );
1883 mss_clamping (sm, tcp0, &sum0);
1884 tcp0->checksum = ip_csum_fold (sum0);
1886 else if (udp0->checksum)
1888 sum0 = udp0->checksum;
1889 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1891 dst_address /* changed member */ );
1892 sum0 = ip_csum_update (sum0, old_port0, new_port0,
1893 ip4_header_t /* cheat */ ,
1894 length /* changed member */ );
1895 udp0->checksum = ip_csum_fold (sum0);
1900 if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
1902 sum0 = tcp0->checksum;
1903 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1905 dst_address /* changed member */ );
1906 mss_clamping (sm, tcp0, &sum0);
1907 tcp0->checksum = ip_csum_fold (sum0);
1909 else if (udp0->checksum)
1911 sum0 = udp0->checksum;
1912 sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
1914 dst_address /* changed member */ );
1915 udp0->checksum = ip_csum_fold (sum0);
1920 snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0, 0);
1923 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
1924 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
1926 snat_in2out_trace_t *t =
1927 vlib_add_trace (vm, node, b0, sizeof (*t));
1928 t->sw_if_index = sw_if_index0;
1929 t->next_index = next0;
1932 pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
1934 /* verify speculative enqueue, maybe switch current next frame */
1935 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1936 to_next, n_left_to_next,
1940 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1943 vlib_node_increment_counter (vm, stats_node_index,
1944 SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
1946 return frame->n_vectors;
1951 VLIB_REGISTER_NODE (snat_in2out_fast_node) = {
1952 .name = "nat44-in2out-fast",
1953 .vector_size = sizeof (u32),
1954 .format_trace = format_snat_in2out_fast_trace,
1955 .type = VLIB_NODE_TYPE_INTERNAL,
1957 .n_errors = ARRAY_LEN(snat_in2out_error_strings),
1958 .error_strings = snat_in2out_error_strings,
1960 .runtime_data_bytes = sizeof (snat_runtime_t),
1962 .n_next_nodes = SNAT_IN2OUT_N_NEXT,
1964 /* edit / add dispositions here */
1966 [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
1967 [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
1968 [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
1969 [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
1975 * fd.io coding-style-patch-verification: ON
1978 * eval: (c-set-style "gnu")