nat: move deterministic nat to det44 sub feature

Type: refactor

Change-Id: I0bb203102a0e13dd7448e2125925ab356bbd7937
Signed-off-by: Filip Varga <fivarga@cisco.com>

1 files changed, 0 insertions, 916 deletions

diff --git a/src/plugins/nat/nat_det_in2out.c b/src/plugins/nat/nat_det_in2out.c
deleted file mode 100644
index 74b4149ba8f..00000000000
--- a/src/plugins/nat/nat_det_in2out.c
+++ /dev/null
@@ -1,916 +0,0 @@
-/*
- * Copyright (c) 2018 Cisco and/or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-/**
- * @file
- * @brief Deterministic/CGN NAT44 inside to outside network translation
- */
-
-#include <vlib/vlib.h>
-#include <vnet/vnet.h>
-#include <vnet/ip/ip.h>
-#include <vnet/fib/ip4_fib.h>
-#include <vppinfra/error.h>
-#include <vppinfra/elog.h>
-#include <nat/nat.h>
-#include <nat/nat_det.h>
-#include <nat/nat_inlines.h>
-#include <nat/lib/nat_inlines.h>
-
-typedef struct
-{
-  u32 sw_if_index;
-  u32 next_index;
-  u32 session_index;
-} nat_det_in2out_trace_t;
-
-typedef enum
-{
-  NAT_DET_IN2OUT_NEXT_LOOKUP,
-  NAT_DET_IN2OUT_NEXT_DROP,
-  NAT_DET_IN2OUT_NEXT_ICMP_ERROR,
-  NAT_DET_IN2OUT_N_NEXT,
-} nat_det_in2out_next_t;
-
-#define foreach_nat_det_in2out_error                    \
-_(UNSUPPORTED_PROTOCOL, "Unsupported protocol")         \
-_(NO_TRANSLATION, "No translation")                     \
-_(BAD_ICMP_TYPE, "unsupported ICMP type")               \
-_(OUT_OF_PORTS, "Out of ports")                         \
-_(IN2OUT_PACKETS, "Good in2out packets processed")
-
-typedef enum
-{
-#define _(sym,str) NAT_DET_IN2OUT_ERROR_##sym,
-  foreach_nat_det_in2out_error
-#undef _
-    NAT_DET_IN2OUT_N_ERROR,
-} nat_det_in2out_error_t;
-
-static char *nat_det_in2out_error_strings[] = {
-#define _(sym,string) string,
-  foreach_nat_det_in2out_error
-#undef _
-};
-
-static u8 *
-format_nat_det_in2out_trace (u8 * s, va_list * args)
-{
-  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
-  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
-  nat_det_in2out_trace_t *t = va_arg (*args, nat_det_in2out_trace_t *);
-
-  s = format (s, "NAT_DET_IN2OUT: sw_if_index %d, next index %d, session %d",
-	      t->sw_if_index, t->next_index, t->session_index);
-
-  return s;
-}
-
-#ifndef CLIB_MARCH_VARIANT
-/**
- * Get address and port values to be used for ICMP packet translation
- * and create session if needed
- *
- * @param[in,out] sm             NAT main
- * @param[in,out] node           NAT node runtime
- * @param[in] thread_index       thread index
- * @param[in,out] b0             buffer containing packet to be translated
- * @param[in,out] ip0            ip header
- * @param[out] p_proto           protocol used for matching
- * @param[out] p_value           address and port after NAT translation
- * @param[out] p_dont_translate  if packet should not be translated
- * @param d                      optional parameter
- * @param e                      optional parameter
- */
-u32
-icmp_match_in2out_det (snat_main_t * sm, vlib_node_runtime_t * node,
-		       u32 thread_index, vlib_buffer_t * b0,
-		       ip4_header_t * ip0, ip4_address_t * addr,
-		       u16 * port, u32 * fib_index,
-		       nat_protocol_t * proto, void *d, void *e,
-		       u8 * dont_translate)
-{
-  vlib_main_t *vm = vlib_get_main ();
-  icmp46_header_t *icmp0;
-  u32 sw_if_index0;
-  u32 rx_fib_index0;
-  nat_protocol_t protocol;
-  snat_det_out_key_t key0;
-  u32 next0 = ~0;
-  icmp_echo_header_t *echo0, *inner_echo0 = 0;
-  ip4_header_t *inner_ip0;
-  void *l4_header = 0;
-  icmp46_header_t *inner_icmp0;
-  snat_det_map_t *dm0 = 0;
-  ip4_address_t new_addr0;
-  u16 lo_port0, i0;
-  snat_det_session_t *ses0 = 0;
-  ip4_address_t in_addr;
-  u16 in_port;
-  *dont_translate = 0;
-
-  icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
-  echo0 = (icmp_echo_header_t *) (icmp0 + 1);
-  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
-  rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
-
-  if (!icmp_type_is_error_message
-      (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags))
-    {
-      protocol = NAT_PROTOCOL_ICMP;
-      in_addr = ip0->src_address;
-      in_port = vnet_buffer (b0)->ip.reass.l4_src_port;
-    }
-  else
-    {
-      /* if error message, then it's not fragmented and we can access it */
-      inner_ip0 = (ip4_header_t *) (echo0 + 1);
-      l4_header = ip4_next_header (inner_ip0);
-      protocol = ip_proto_to_nat_proto (inner_ip0->protocol);
-      in_addr = inner_ip0->dst_address;
-      switch (protocol)
-	{
-	case NAT_PROTOCOL_ICMP:
-	  inner_icmp0 = (icmp46_header_t *) l4_header;
-	  inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
-	  in_port = inner_echo0->identifier;
-	  break;
-	case NAT_PROTOCOL_UDP:
-	case NAT_PROTOCOL_TCP:
-	  in_port = ((tcp_udp_header_t *) l4_header)->dst_port;
-	  break;
-	default:
-	  b0->error = node->errors[NAT_DET_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
-	  next0 = NAT_DET_IN2OUT_NEXT_DROP;
-	  goto out;
-	}
-    }
-
-  dm0 = snat_det_map_by_user (sm, &in_addr);
-  if (PREDICT_FALSE (!dm0))
-    {
-      nat_log_info ("no match for internal host %U",
-		    format_ip4_address, &in_addr);
-      if (PREDICT_FALSE (snat_not_translate_fast (sm, node, sw_if_index0, ip0,
-						  IP_PROTOCOL_ICMP,
-						  rx_fib_index0)))
-	{
-	  *dont_translate = 1;
-	  goto out;
-	}
-      next0 = NAT_DET_IN2OUT_NEXT_DROP;
-      b0->error = node->errors[NAT_DET_IN2OUT_ERROR_NO_TRANSLATION];
-      goto out;
-    }
-
-  snat_det_forward (dm0, &in_addr, &new_addr0, &lo_port0);
-
-  key0.ext_host_addr = ip0->dst_address;
-  key0.ext_host_port = 0;
-
-  ses0 = snat_det_find_ses_by_in (dm0, &in_addr, in_port, key0);
-  if (PREDICT_FALSE (!ses0))
-    {
-      if (PREDICT_FALSE (snat_not_translate_fast (sm, node, sw_if_index0, ip0,
-						  IP_PROTOCOL_ICMP,
-						  rx_fib_index0)))
-	{
-	  *dont_translate = 1;
-	  goto out;
-	}
-      if (icmp0->type != ICMP4_echo_request)
-	{
-	  b0->error = node->errors[NAT_DET_IN2OUT_ERROR_BAD_ICMP_TYPE];
-	  next0 = NAT_DET_IN2OUT_NEXT_DROP;
-	  goto out;
-	}
-      for (i0 = 0; i0 < dm0->ports_per_host; i0++)
-	{
-	  key0.out_port = clib_host_to_net_u16 (lo_port0 +
-						((i0 +
-						  clib_net_to_host_u16
-						  (echo0->identifier)) %
-						 dm0->ports_per_host));
-
-	  if (snat_det_get_ses_by_out (dm0, &in_addr, key0.as_u64))
-	    continue;
-
-	  ses0 =
-	    snat_det_ses_create (thread_index, dm0,
-				 &in_addr, echo0->identifier, &key0);
-	  break;
-	}
-      if (PREDICT_FALSE (!ses0))
-	{
-	  next0 = NAT_DET_IN2OUT_NEXT_DROP;
-	  b0->error = node->errors[NAT_DET_IN2OUT_ERROR_OUT_OF_PORTS];
-	  goto out;
-	}
-    }
-
-  if (PREDICT_FALSE
-      (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_request
-       && !icmp_type_is_error_message (vnet_buffer (b0)->ip.
-				       reass.icmp_type_or_tcp_flags)))
-    {
-      b0->error = node->errors[NAT_DET_IN2OUT_ERROR_BAD_ICMP_TYPE];
-      next0 = NAT_DET_IN2OUT_NEXT_DROP;
-      goto out;
-    }
-
-  u32 now = (u32) vlib_time_now (vm);
-
-  ses0->state = SNAT_SESSION_ICMP_ACTIVE;
-  ses0->expire = now + sm->icmp_timeout;
-
-out:
-  *proto = protocol;
-  if (ses0)
-    {
-      *addr = new_addr0;
-      *fib_index = sm->outside_fib_index;
-      *port = ses0->out.out_port;
-    }
-  if (d)
-    *(snat_det_session_t **) d = ses0;
-  if (e)
-    *(snat_det_map_t **) e = dm0;
-  return next0;
-}
-#endif
-
-VLIB_NODE_FN (snat_det_in2out_node) (vlib_main_t * vm,
-				     vlib_node_runtime_t * node,
-				     vlib_frame_t * frame)
-{
-  u32 n_left_from, *from, *to_next;
-  nat_det_in2out_next_t next_index;
-  u32 pkts_processed = 0;
-  snat_main_t *sm = &snat_main;
-  u32 now = (u32) vlib_time_now (vm);
-  u32 thread_index = vm->thread_index;
-
-  from = vlib_frame_vector_args (frame);
-  n_left_from = frame->n_vectors;
-  next_index = node->cached_next_index;
-
-  while (n_left_from > 0)
-    {
-      u32 n_left_to_next;
-
-      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
-
-      while (n_left_from >= 4 && n_left_to_next >= 2)
-	{
-	  u32 bi0, bi1;
-	  vlib_buffer_t *b0, *b1;
-	  u32 next0, next1;
-	  u32 sw_if_index0, sw_if_index1;
-	  ip4_header_t *ip0, *ip1;
-	  ip_csum_t sum0, sum1;
-	  ip4_address_t new_addr0, old_addr0, new_addr1, old_addr1;
-	  u16 old_port0, new_port0, lo_port0, i0;
-	  u16 old_port1, new_port1, lo_port1, i1;
-	  udp_header_t *udp0, *udp1;
-	  tcp_header_t *tcp0, *tcp1;
-	  u32 proto0, proto1;
-	  snat_det_out_key_t key0, key1;
-	  snat_det_map_t *dm0, *dm1;
-	  snat_det_session_t *ses0 = 0, *ses1 = 0;
-	  u32 rx_fib_index0, rx_fib_index1;
-	  icmp46_header_t *icmp0, *icmp1;
-
-	  /* Prefetch next iteration. */
-	  {
-	    vlib_buffer_t *p2, *p3;
-
-	    p2 = vlib_get_buffer (vm, from[2]);
-	    p3 = vlib_get_buffer (vm, from[3]);
-
-	    vlib_prefetch_buffer_header (p2, LOAD);
-	    vlib_prefetch_buffer_header (p3, LOAD);
-
-	    CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, LOAD);
-	    CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, LOAD);
-	  }
-
-	  /* speculatively enqueue b0 and b1 to the current next frame */
-	  to_next[0] = bi0 = from[0];
-	  to_next[1] = bi1 = from[1];
-	  from += 2;
-	  to_next += 2;
-	  n_left_from -= 2;
-	  n_left_to_next -= 2;
-
-	  b0 = vlib_get_buffer (vm, bi0);
-	  b1 = vlib_get_buffer (vm, bi1);
-
-	  next0 = NAT_DET_IN2OUT_NEXT_LOOKUP;
-	  next1 = NAT_DET_IN2OUT_NEXT_LOOKUP;
-
-	  ip0 = vlib_buffer_get_current (b0);
-	  udp0 = ip4_next_header (ip0);
-	  tcp0 = (tcp_header_t *) udp0;
-
-	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
-
-	  if (PREDICT_FALSE (ip0->ttl == 1))
-	    {
-	      vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
-	      icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
-					   ICMP4_time_exceeded_ttl_exceeded_in_transit,
-					   0);
-	      next0 = NAT_DET_IN2OUT_NEXT_ICMP_ERROR;
-	      goto trace0;
-	    }
-
-	  proto0 = ip_proto_to_nat_proto (ip0->protocol);
-
-	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
-	    {
-	      rx_fib_index0 =
-		ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
-	      icmp0 = (icmp46_header_t *) udp0;
-
-	      next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0,
-				   rx_fib_index0, node, next0, thread_index,
-				   &ses0, &dm0);
-	      goto trace0;
-	    }
-
-	  dm0 = snat_det_map_by_user (sm, &ip0->src_address);
-	  if (PREDICT_FALSE (!dm0))
-	    {
-	      nat_log_info ("no match for internal host %U",
-			    format_ip4_address, &ip0->src_address);
-	      next0 = NAT_DET_IN2OUT_NEXT_DROP;
-	      b0->error = node->errors[NAT_DET_IN2OUT_ERROR_NO_TRANSLATION];
-	      goto trace0;
-	    }
-
-	  snat_det_forward (dm0, &ip0->src_address, &new_addr0, &lo_port0);
-
-	  key0.ext_host_addr = ip0->dst_address;
-	  key0.ext_host_port = tcp0->dst;
-
-	  ses0 =
-	    snat_det_find_ses_by_in (dm0, &ip0->src_address, tcp0->src, key0);
-	  if (PREDICT_FALSE (!ses0))
-	    {
-	      for (i0 = 0; i0 < dm0->ports_per_host; i0++)
-		{
-		  key0.out_port = clib_host_to_net_u16 (lo_port0 +
-							((i0 +
-							  clib_net_to_host_u16
-							  (tcp0->src)) %
-							 dm0->
-							 ports_per_host));
-
-		  if (snat_det_get_ses_by_out
-		      (dm0, &ip0->src_address, key0.as_u64))
-		    continue;
-
-		  ses0 =
-		    snat_det_ses_create (thread_index, dm0, &ip0->src_address,
-					 tcp0->src, &key0);
-		  break;
-		}
-	      if (PREDICT_FALSE (!ses0))
-		{
-		  /* too many sessions for user, send ICMP error packet */
-		  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
-		  icmp4_error_set_vnet_buffer (b0,
-					       ICMP4_destination_unreachable,
-					       ICMP4_destination_unreachable_destination_unreachable_host,
-					       0);
-		  next0 = NAT_DET_IN2OUT_NEXT_ICMP_ERROR;
-		  goto trace0;
-		}
-	    }
-
-	  old_port0 = udp0->src_port;
-	  udp0->src_port = new_port0 = ses0->out.out_port;
-
-	  old_addr0.as_u32 = ip0->src_address.as_u32;
-	  ip0->src_address.as_u32 = new_addr0.as_u32;
-	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm->outside_fib_index;
-
-	  sum0 = ip0->checksum;
-	  sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
-				 ip4_header_t,
-				 src_address /* changed member */ );
-	  ip0->checksum = ip_csum_fold (sum0);
-
-	  if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
-	    {
-	      if (tcp0->flags & TCP_FLAG_SYN)
-		ses0->state = SNAT_SESSION_TCP_SYN_SENT;
-	      else if (tcp0->flags & TCP_FLAG_ACK
-		       && ses0->state == SNAT_SESSION_TCP_SYN_SENT)
-		ses0->state = SNAT_SESSION_TCP_ESTABLISHED;
-	      else if (tcp0->flags & TCP_FLAG_FIN
-		       && ses0->state == SNAT_SESSION_TCP_ESTABLISHED)
-		ses0->state = SNAT_SESSION_TCP_FIN_WAIT;
-	      else if (tcp0->flags & TCP_FLAG_ACK
-		       && ses0->state == SNAT_SESSION_TCP_FIN_WAIT)
-		snat_det_ses_close (dm0, ses0);
-	      else if (tcp0->flags & TCP_FLAG_FIN
-		       && ses0->state == SNAT_SESSION_TCP_CLOSE_WAIT)
-		ses0->state = SNAT_SESSION_TCP_LAST_ACK;
-	      else if (tcp0->flags == 0
-		       && ses0->state == SNAT_SESSION_UNKNOWN)
-		ses0->state = SNAT_SESSION_TCP_ESTABLISHED;
-
-	      sum0 = tcp0->checksum;
-	      sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
-				     ip4_header_t,
-				     dst_address /* changed member */ );
-	      sum0 = ip_csum_update (sum0, old_port0, new_port0,
-				     ip4_header_t /* cheat */ ,
-				     length /* changed member */ );
-	      mss_clamping (sm->mss_clamping, tcp0, &sum0);
-	      tcp0->checksum = ip_csum_fold (sum0);
-	    }
-	  else
-	    {
-	      ses0->state = SNAT_SESSION_UDP_ACTIVE;
-
-	      if (PREDICT_FALSE (udp0->checksum))
-		{
-		  sum0 = udp0->checksum;
-		  sum0 =
-		    ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
-				    ip4_header_t,
-				    dst_address /* changed member */ );
-		  sum0 =
-		    ip_csum_update (sum0, old_port0, new_port0,
-				    ip4_header_t /* cheat */ ,
-				    length /* changed member */ );
-		  udp0->checksum = ip_csum_fold (sum0);
-		}
-	    }
-
-	  switch (ses0->state)
-	    {
-	    case SNAT_SESSION_UDP_ACTIVE:
-	      ses0->expire = now + sm->udp_timeout;
-	      break;
-	    case SNAT_SESSION_TCP_SYN_SENT:
-	    case SNAT_SESSION_TCP_FIN_WAIT:
-	    case SNAT_SESSION_TCP_CLOSE_WAIT:
-	    case SNAT_SESSION_TCP_LAST_ACK:
-	      ses0->expire = now + sm->tcp_transitory_timeout;
-	      break;
-	    case SNAT_SESSION_TCP_ESTABLISHED:
-	      ses0->expire = now + sm->tcp_established_timeout;
-	      break;
-	    }
-
-	trace0:
-	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
-			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
-	    {
-	      nat_det_in2out_trace_t *t =
-		vlib_add_trace (vm, node, b0, sizeof (*t));
-	      t->sw_if_index = sw_if_index0;
-	      t->next_index = next0;
-	      t->session_index = ~0;
-	      if (ses0)
-		t->session_index = ses0 - dm0->sessions;
-	    }
-
-	  pkts_processed += next0 != NAT_DET_IN2OUT_NEXT_DROP;
-
-	  ip1 = vlib_buffer_get_current (b1);
-	  udp1 = ip4_next_header (ip1);
-	  tcp1 = (tcp_header_t *) udp1;
-
-	  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
-
-	  if (PREDICT_FALSE (ip1->ttl == 1))
-	    {
-	      vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
-	      icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
-					   ICMP4_time_exceeded_ttl_exceeded_in_transit,
-					   0);
-	      next1 = NAT_DET_IN2OUT_NEXT_ICMP_ERROR;
-	      goto trace1;
-	    }
-
-	  proto1 = ip_proto_to_nat_proto (ip1->protocol);
-
-	  if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP))
-	    {
-	      rx_fib_index1 =
-		ip4_fib_table_get_index_for_sw_if_index (sw_if_index1);
-	      icmp1 = (icmp46_header_t *) udp1;
-
-	      next1 = icmp_in2out (sm, b1, ip1, icmp1, sw_if_index1,
-				   rx_fib_index1, node, next1, thread_index,
-				   &ses1, &dm1);
-	      goto trace1;
-	    }
-
-	  dm1 = snat_det_map_by_user (sm, &ip1->src_address);
-	  if (PREDICT_FALSE (!dm1))
-	    {
-	      nat_log_info ("no match for internal host %U",
-			    format_ip4_address, &ip0->src_address);
-	      next1 = NAT_DET_IN2OUT_NEXT_DROP;
-	      b1->error = node->errors[NAT_DET_IN2OUT_ERROR_NO_TRANSLATION];
-	      goto trace1;
-	    }
-
-	  snat_det_forward (dm1, &ip1->src_address, &new_addr1, &lo_port1);
-
-	  key1.ext_host_addr = ip1->dst_address;
-	  key1.ext_host_port = tcp1->dst;
-
-	  ses1 =
-	    snat_det_find_ses_by_in (dm1, &ip1->src_address, tcp1->src, key1);
-	  if (PREDICT_FALSE (!ses1))
-	    {
-	      for (i1 = 0; i1 < dm1->ports_per_host; i1++)
-		{
-		  key1.out_port = clib_host_to_net_u16 (lo_port1 +
-							((i1 +
-							  clib_net_to_host_u16
-							  (tcp1->src)) %
-							 dm1->
-							 ports_per_host));
-
-		  if (snat_det_get_ses_by_out
-		      (dm1, &ip1->src_address, key1.as_u64))
-		    continue;
-
-		  ses1 =
-		    snat_det_ses_create (thread_index, dm1, &ip1->src_address,
-					 tcp1->src, &key1);
-		  break;
-		}
-	      if (PREDICT_FALSE (!ses1))
-		{
-		  /* too many sessions for user, send ICMP error packet */
-		  vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
-		  icmp4_error_set_vnet_buffer (b1,
-					       ICMP4_destination_unreachable,
-					       ICMP4_destination_unreachable_destination_unreachable_host,
-					       0);
-		  next1 = NAT_DET_IN2OUT_NEXT_ICMP_ERROR;
-		  goto trace1;
-		}
-	    }
-
-	  old_port1 = udp1->src_port;
-	  udp1->src_port = new_port1 = ses1->out.out_port;
-
-	  old_addr1.as_u32 = ip1->src_address.as_u32;
-	  ip1->src_address.as_u32 = new_addr1.as_u32;
-	  vnet_buffer (b1)->sw_if_index[VLIB_TX] = sm->outside_fib_index;
-
-	  sum1 = ip1->checksum;
-	  sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
-				 ip4_header_t,
-				 src_address /* changed member */ );
-	  ip1->checksum = ip_csum_fold (sum1);
-
-	  if (PREDICT_TRUE (proto1 == NAT_PROTOCOL_TCP))
-	    {
-	      if (tcp1->flags & TCP_FLAG_SYN)
-		ses1->state = SNAT_SESSION_TCP_SYN_SENT;
-	      else if (tcp1->flags & TCP_FLAG_ACK
-		       && ses1->state == SNAT_SESSION_TCP_SYN_SENT)
-		ses1->state = SNAT_SESSION_TCP_ESTABLISHED;
-	      else if (tcp1->flags & TCP_FLAG_FIN
-		       && ses1->state == SNAT_SESSION_TCP_ESTABLISHED)
-		ses1->state = SNAT_SESSION_TCP_FIN_WAIT;
-	      else if (tcp1->flags & TCP_FLAG_ACK
-		       && ses1->state == SNAT_SESSION_TCP_FIN_WAIT)
-		snat_det_ses_close (dm1, ses1);
-	      else if (tcp1->flags & TCP_FLAG_FIN
-		       && ses1->state == SNAT_SESSION_TCP_CLOSE_WAIT)
-		ses1->state = SNAT_SESSION_TCP_LAST_ACK;
-	      else if (tcp1->flags == 0
-		       && ses1->state == SNAT_SESSION_UNKNOWN)
-		ses1->state = SNAT_SESSION_TCP_ESTABLISHED;
-
-	      sum1 = tcp1->checksum;
-	      sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
-				     ip4_header_t,
-				     dst_address /* changed member */ );
-	      sum1 = ip_csum_update (sum1, old_port1, new_port1,
-				     ip4_header_t /* cheat */ ,
-				     length /* changed member */ );
-	      mss_clamping (sm->mss_clamping, tcp1, &sum1);
-	      tcp1->checksum = ip_csum_fold (sum1);
-	    }
-	  else
-	    {
-	      ses1->state = SNAT_SESSION_UDP_ACTIVE;
-
-	      if (PREDICT_FALSE (udp1->checksum))
-		{
-		  sum1 = udp1->checksum;
-		  sum1 =
-		    ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
-				    ip4_header_t,
-				    dst_address /* changed member */ );
-		  sum1 =
-		    ip_csum_update (sum1, old_port1, new_port1,
-				    ip4_header_t /* cheat */ ,
-				    length /* changed member */ );
-		  udp1->checksum = ip_csum_fold (sum1);
-		}
-	    }
-
-	  switch (ses1->state)
-	    {
-	    case SNAT_SESSION_UDP_ACTIVE:
-	      ses1->expire = now + sm->udp_timeout;
-	      break;
-	    case SNAT_SESSION_TCP_SYN_SENT:
-	    case SNAT_SESSION_TCP_FIN_WAIT:
-	    case SNAT_SESSION_TCP_CLOSE_WAIT:
-	    case SNAT_SESSION_TCP_LAST_ACK:
-	      ses1->expire = now + sm->tcp_transitory_timeout;
-	      break;
-	    case SNAT_SESSION_TCP_ESTABLISHED:
-	      ses1->expire = now + sm->tcp_established_timeout;
-	      break;
-	    }
-
-	trace1:
-	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
-			     && (b1->flags & VLIB_BUFFER_IS_TRACED)))
-	    {
-	      nat_det_in2out_trace_t *t =
-		vlib_add_trace (vm, node, b1, sizeof (*t));
-	      t->sw_if_index = sw_if_index1;
-	      t->next_index = next1;
-	      t->session_index = ~0;
-	      if (ses1)
-		t->session_index = ses1 - dm1->sessions;
-	    }
-
-	  pkts_processed += next1 != NAT_DET_IN2OUT_NEXT_DROP;
-
-	  /* verify speculative enqueues, maybe switch current next frame */
-	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
-					   to_next, n_left_to_next,
-					   bi0, bi1, next0, next1);
-	}
-
-      while (n_left_from > 0 && n_left_to_next > 0)
-	{
-	  u32 bi0;
-	  vlib_buffer_t *b0;
-	  u32 next0;
-	  u32 sw_if_index0;
-	  ip4_header_t *ip0;
-	  ip_csum_t sum0;
-	  ip4_address_t new_addr0, old_addr0;
-	  u16 old_port0, new_port0, lo_port0, i0;
-	  udp_header_t *udp0;
-	  tcp_header_t *tcp0;
-	  u32 proto0;
-	  snat_det_out_key_t key0;
-	  snat_det_map_t *dm0;
-	  snat_det_session_t *ses0 = 0;
-	  u32 rx_fib_index0;
-	  icmp46_header_t *icmp0;
-
-	  /* speculatively enqueue b0 to the current next frame */
-	  bi0 = from[0];
-	  to_next[0] = bi0;
-	  from += 1;
-	  to_next += 1;
-	  n_left_from -= 1;
-	  n_left_to_next -= 1;
-
-	  b0 = vlib_get_buffer (vm, bi0);
-	  next0 = NAT_DET_IN2OUT_NEXT_LOOKUP;
-
-	  ip0 = vlib_buffer_get_current (b0);
-	  udp0 = ip4_next_header (ip0);
-	  tcp0 = (tcp_header_t *) udp0;
-
-	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
-
-	  if (PREDICT_FALSE (ip0->ttl == 1))
-	    {
-	      vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
-	      icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
-					   ICMP4_time_exceeded_ttl_exceeded_in_transit,
-					   0);
-	      next0 = NAT_DET_IN2OUT_NEXT_ICMP_ERROR;
-	      goto trace00;
-	    }
-
-	  proto0 = ip_proto_to_nat_proto (ip0->protocol);
-
-	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
-	    {
-	      rx_fib_index0 =
-		ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
-	      icmp0 = (icmp46_header_t *) udp0;
-
-	      next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0,
-				   rx_fib_index0, node, next0, thread_index,
-				   &ses0, &dm0);
-	      goto trace00;
-	    }
-
-	  dm0 = snat_det_map_by_user (sm, &ip0->src_address);
-	  if (PREDICT_FALSE (!dm0))
-	    {
-	      nat_log_info ("no match for internal host %U",
-			    format_ip4_address, &ip0->src_address);
-	      next0 = NAT_DET_IN2OUT_NEXT_DROP;
-	      b0->error = node->errors[NAT_DET_IN2OUT_ERROR_NO_TRANSLATION];
-	      goto trace00;
-	    }
-
-	  snat_det_forward (dm0, &ip0->src_address, &new_addr0, &lo_port0);
-
-	  key0.ext_host_addr = ip0->dst_address;
-	  key0.ext_host_port = tcp0->dst;
-
-	  ses0 =
-	    snat_det_find_ses_by_in (dm0, &ip0->src_address, tcp0->src, key0);
-	  if (PREDICT_FALSE (!ses0))
-	    {
-	      for (i0 = 0; i0 < dm0->ports_per_host; i0++)
-		{
-		  key0.out_port = clib_host_to_net_u16 (lo_port0 +
-							((i0 +
-							  clib_net_to_host_u16
-							  (tcp0->src)) %
-							 dm0->
-							 ports_per_host));
-
-		  if (snat_det_get_ses_by_out
-		      (dm0, &ip0->src_address, key0.as_u64))
-		    continue;
-
-		  ses0 =
-		    snat_det_ses_create (thread_index, dm0, &ip0->src_address,
-					 tcp0->src, &key0);
-		  break;
-		}
-	      if (PREDICT_FALSE (!ses0))
-		{
-		  /* too many sessions for user, send ICMP error packet */
-		  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
-		  icmp4_error_set_vnet_buffer (b0,
-					       ICMP4_destination_unreachable,
-					       ICMP4_destination_unreachable_destination_unreachable_host,
-					       0);
-		  next0 = NAT_DET_IN2OUT_NEXT_ICMP_ERROR;
-		  goto trace00;
-		}
-	    }
-
-	  old_port0 = udp0->src_port;
-	  udp0->src_port = new_port0 = ses0->out.out_port;
-
-	  old_addr0.as_u32 = ip0->src_address.as_u32;
-	  ip0->src_address.as_u32 = new_addr0.as_u32;
-	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm->outside_fib_index;
-
-	  sum0 = ip0->checksum;
-	  sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
-				 ip4_header_t,
-				 src_address /* changed member */ );
-	  ip0->checksum = ip_csum_fold (sum0);
-
-	  if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
-	    {
-	      if (tcp0->flags & TCP_FLAG_SYN)
-		ses0->state = SNAT_SESSION_TCP_SYN_SENT;
-	      else if (tcp0->flags & TCP_FLAG_ACK
-		       && ses0->state == SNAT_SESSION_TCP_SYN_SENT)
-		ses0->state = SNAT_SESSION_TCP_ESTABLISHED;
-	      else if (tcp0->flags & TCP_FLAG_FIN
-		       && ses0->state == SNAT_SESSION_TCP_ESTABLISHED)
-		ses0->state = SNAT_SESSION_TCP_FIN_WAIT;
-	      else if (tcp0->flags & TCP_FLAG_ACK
-		       && ses0->state == SNAT_SESSION_TCP_FIN_WAIT)
-		snat_det_ses_close (dm0, ses0);
-	      else if (tcp0->flags & TCP_FLAG_FIN
-		       && ses0->state == SNAT_SESSION_TCP_CLOSE_WAIT)
-		ses0->state = SNAT_SESSION_TCP_LAST_ACK;
-	      else if (tcp0->flags == 0
-		       && ses0->state == SNAT_SESSION_UNKNOWN)
-		ses0->state = SNAT_SESSION_TCP_ESTABLISHED;
-
-	      sum0 = tcp0->checksum;
-	      sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
-				     ip4_header_t,
-				     dst_address /* changed member */ );
-	      sum0 = ip_csum_update (sum0, old_port0, new_port0,
-				     ip4_header_t /* cheat */ ,
-				     length /* changed member */ );
-	      mss_clamping (sm->mss_clamping, tcp0, &sum0);
-	      tcp0->checksum = ip_csum_fold (sum0);
-	    }
-	  else
-	    {
-	      ses0->state = SNAT_SESSION_UDP_ACTIVE;
-
-	      if (PREDICT_FALSE (udp0->checksum))
-		{
-		  sum0 = udp0->checksum;
-		  sum0 =
-		    ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
-				    ip4_header_t,
-				    dst_address /* changed member */ );
-		  sum0 =
-		    ip_csum_update (sum0, old_port0, new_port0,
-				    ip4_header_t /* cheat */ ,
-				    length /* changed member */ );
-		  udp0->checksum = ip_csum_fold (sum0);
-		}
-	    }
-
-	  switch (ses0->state)
-	    {
-	    case SNAT_SESSION_UDP_ACTIVE:
-	      ses0->expire = now + sm->udp_timeout;
-	      break;
-	    case SNAT_SESSION_TCP_SYN_SENT:
-	    case SNAT_SESSION_TCP_FIN_WAIT:
-	    case SNAT_SESSION_TCP_CLOSE_WAIT:
-	    case SNAT_SESSION_TCP_LAST_ACK:
-	      ses0->expire = now + sm->tcp_transitory_timeout;
-	      break;
-	    case SNAT_SESSION_TCP_ESTABLISHED:
-	      ses0->expire = now + sm->tcp_established_timeout;
-	      break;
-	    }
-
-	trace00:
-	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
-			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
-	    {
-	      nat_det_in2out_trace_t *t =
-		vlib_add_trace (vm, node, b0, sizeof (*t));
-	      t->sw_if_index = sw_if_index0;
-	      t->next_index = next0;
-	      t->session_index = ~0;
-	      if (ses0)
-		t->session_index = ses0 - dm0->sessions;
-	    }
-
-	  pkts_processed += next0 != NAT_DET_IN2OUT_NEXT_DROP;
-
-	  /* verify speculative enqueue, maybe switch current next frame */
-	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
-					   to_next, n_left_to_next,
-					   bi0, next0);
-	}
-
-      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
-    }
-
-  vlib_node_increment_counter (vm, sm->det_in2out_node_index,
-			       NAT_DET_IN2OUT_ERROR_IN2OUT_PACKETS,
-			       pkts_processed);
-  return frame->n_vectors;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (snat_det_in2out_node) = {
-  .name = "nat44-det-in2out",
-  .vector_size = sizeof (u32),
-  .format_trace = format_nat_det_in2out_trace,
-  .type = VLIB_NODE_TYPE_INTERNAL,
-  .n_errors = ARRAY_LEN(nat_det_in2out_error_strings),
-  .error_strings = nat_det_in2out_error_strings,
-  .n_next_nodes = NAT_DET_IN2OUT_N_NEXT,
-  /* edit / add dispositions here */
-  .next_nodes = {
-    [NAT_DET_IN2OUT_NEXT_DROP] = "error-drop",
-    [NAT_DET_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
-    [NAT_DET_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
-  },
-};
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */