nat: move nat64 to a subfeature

Type: refactor

Change-Id: I3b9e17164647d2019b1f40cffeed63393345219e
Signed-off-by: Filip Varga <fivarga@cisco.com>

1 files changed, 0 insertions, 1416 deletions

diff --git a/src/plugins/nat/nat64_in2out.c b/src/plugins/nat/nat64_in2out.c
deleted file mode 100644
index 1928bf899a6..00000000000
--- a/src/plugins/nat/nat64_in2out.c
+++ /dev/null
@@ -1,1416 +0,0 @@
-/*
- * Copyright (c) 2017 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 NAT64 IPv6 to IPv4 translation (inside to outside network)
- */
-
-#include <nat/nat64.h>
-#include <nat/nat_inlines.h>
-#include <vnet/ip/ip6_to_ip4.h>
-#include <vnet/fib/fib_table.h>
-#include <nat/lib/nat_inlines.h>
-
-typedef struct
-{
-  u32 sw_if_index;
-  u32 next_index;
-  u8 is_slow_path;
-} nat64_in2out_trace_t;
-
-static u8 *
-format_nat64_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 *);
-  nat64_in2out_trace_t *t = va_arg (*args, nat64_in2out_trace_t *);
-  char *tag;
-
-  tag = t->is_slow_path ? "NAT64-in2out-slowpath" : "NAT64-in2out";
-
-  s =
-    format (s, "%s: sw_if_index %d, next index %d", tag, t->sw_if_index,
-	    t->next_index);
-
-  return s;
-}
-
-#define foreach_nat64_in2out_error                       \
-_(UNSUPPORTED_PROTOCOL, "unsupported protocol")          \
-_(NO_TRANSLATION, "no translation")                      \
-_(UNKNOWN, "unknown")
-
-
-typedef enum
-{
-#define _(sym,str) NAT64_IN2OUT_ERROR_##sym,
-  foreach_nat64_in2out_error
-#undef _
-    NAT64_IN2OUT_N_ERROR,
-} nat64_in2out_error_t;
-
-static char *nat64_in2out_error_strings[] = {
-#define _(sym,string) string,
-  foreach_nat64_in2out_error
-#undef _
-};
-
-typedef enum
-{
-  NAT64_IN2OUT_NEXT_IP4_LOOKUP,
-  NAT64_IN2OUT_NEXT_IP6_LOOKUP,
-  NAT64_IN2OUT_NEXT_DROP,
-  NAT64_IN2OUT_NEXT_SLOWPATH,
-  NAT64_IN2OUT_N_NEXT,
-} nat64_in2out_next_t;
-
-typedef struct nat64_in2out_set_ctx_t_
-{
-  vlib_buffer_t *b;
-  vlib_main_t *vm;
-  u32 thread_index;
-} nat64_in2out_set_ctx_t;
-
-static inline u8
-nat64_not_translate (u32 sw_if_index, ip6_address_t ip6_addr)
-{
-  ip6_address_t *addr;
-  ip6_main_t *im6 = &ip6_main;
-  ip_lookup_main_t *lm6 = &im6->lookup_main;
-  ip_interface_address_t *ia = 0;
-
-  /* *INDENT-OFF* */
-  foreach_ip_interface_address (lm6, ia, sw_if_index, 0,
-  ({
-	addr = ip_interface_address_get_address (lm6, ia);
-	if (0 == ip6_address_compare (addr, &ip6_addr))
-		return 1;
-  }));
-  /* *INDENT-ON* */
-
-  return 0;
-}
-
-/**
- * @brief Check whether is a hairpinning.
- *
- * If the destination IP address of the packet is an IPv4 address assigned to
- * the NAT64 itself, then the packet is a hairpin packet.
- *
- * param dst_addr Destination address of the packet.
- *
- * @returns 1 if hairpinning, otherwise 0.
- */
-static_always_inline int
-is_hairpinning (ip6_address_t * dst_addr)
-{
-  nat64_main_t *nm = &nat64_main;
-  int i;
-
-  for (i = 0; i < vec_len (nm->addr_pool); i++)
-    {
-      if (nm->addr_pool[i].addr.as_u32 == dst_addr->as_u32[3])
-	return 1;
-    }
-
-  return 0;
-}
-
-static int
-nat64_in2out_tcp_udp (vlib_main_t * vm, vlib_buffer_t * p, u16 l4_offset,
-		      u16 frag_hdr_offset, nat64_in2out_set_ctx_t * ctx)
-{
-  ip6_header_t *ip6;
-  ip_csum_t csum = 0;
-  ip4_header_t *ip4;
-  u16 fragment_id;
-  u8 frag_more;
-  u16 frag_offset;
-  nat64_main_t *nm = &nat64_main;
-  nat64_db_bib_entry_t *bibe;
-  nat64_db_st_entry_t *ste;
-  ip46_address_t old_saddr, old_daddr;
-  ip4_address_t new_daddr;
-  u32 sw_if_index, fib_index;
-  u8 proto = vnet_buffer (p)->ip.reass.ip_proto;
-  u16 sport = vnet_buffer (p)->ip.reass.l4_src_port;
-  u16 dport = vnet_buffer (p)->ip.reass.l4_dst_port;
-  nat64_db_t *db = &nm->db[ctx->thread_index];
-
-  ip6 = vlib_buffer_get_current (p);
-
-  vlib_buffer_advance (p, l4_offset - sizeof (*ip4));
-  ip4 = vlib_buffer_get_current (p);
-
-  u32 ip_version_traffic_class_and_flow_label =
-    ip6->ip_version_traffic_class_and_flow_label;
-  u16 payload_length = ip6->payload_length;
-  u8 hop_limit = ip6->hop_limit;
-
-  old_saddr.as_u64[0] = ip6->src_address.as_u64[0];
-  old_saddr.as_u64[1] = ip6->src_address.as_u64[1];
-  old_daddr.as_u64[0] = ip6->dst_address.as_u64[0];
-  old_daddr.as_u64[1] = ip6->dst_address.as_u64[1];
-
-  if (PREDICT_FALSE (frag_hdr_offset))
-    {
-      //Only the first fragment
-      ip6_frag_hdr_t *hdr =
-	(ip6_frag_hdr_t *) u8_ptr_add (ip6, frag_hdr_offset);
-      fragment_id = frag_id_6to4 (hdr->identification);
-      frag_more = ip6_frag_hdr_more (hdr);
-      frag_offset = ip6_frag_hdr_offset (hdr);
-    }
-  else
-    {
-      fragment_id = 0;
-      frag_offset = 0;
-      frag_more = 0;
-    }
-
-  ip4->ip_version_and_header_length =
-    IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS;
-  ip4->tos = ip6_translate_tos (ip_version_traffic_class_and_flow_label);
-  ip4->length =
-    u16_net_add (payload_length, sizeof (*ip4) + sizeof (*ip6) - l4_offset);
-  ip4->fragment_id = fragment_id;
-  ip4->flags_and_fragment_offset =
-    clib_host_to_net_u16 (frag_offset |
-			  (frag_more ? IP4_HEADER_FLAG_MORE_FRAGMENTS : 0));
-  ip4->ttl = hop_limit;
-  ip4->protocol = (proto == IP_PROTOCOL_ICMP6) ? IP_PROTOCOL_ICMP : proto;
-
-  sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
-  fib_index =
-    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
-  ste =
-    nat64_db_st_entry_find (db, &old_saddr, &old_daddr, sport, dport, proto,
-			    fib_index, 1);
-
-  if (ste)
-    {
-      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
-      if (!bibe)
-	return -1;
-    }
-  else
-    {
-      bibe =
-	nat64_db_bib_entry_find (db, &old_saddr, sport, proto, fib_index, 1);
-
-      if (!bibe)
-	{
-	  u16 out_port;
-	  ip4_address_t out_addr;
-	  if (nat64_alloc_out_addr_and_port
-	      (fib_index, ip_proto_to_nat_proto (proto), &out_addr,
-	       &out_port, ctx->thread_index))
-	    return -1;
-
-	  bibe =
-	    nat64_db_bib_entry_create (ctx->thread_index, db,
-				       &old_saddr.ip6, &out_addr, sport,
-				       out_port, fib_index, proto, 0);
-	  if (!bibe)
-	    return -1;
-
-	  vlib_set_simple_counter (&nm->total_bibs, ctx->thread_index, 0,
-				   db->bib.bib_entries_num);
-	}
-
-      nat64_extract_ip4 (&old_daddr.ip6, &new_daddr, fib_index);
-      ste =
-	nat64_db_st_entry_create (ctx->thread_index, db, bibe,
-				  &old_daddr.ip6, &new_daddr, dport);
-      if (!ste)
-	return -1;
-
-      vlib_set_simple_counter (&nm->total_sessions, ctx->thread_index, 0,
-			       db->st.st_entries_num);
-    }
-
-  ip4->src_address.as_u32 = bibe->out_addr.as_u32;
-  ip4->dst_address.as_u32 = ste->out_r_addr.as_u32;
-
-  ip4->checksum = ip4_header_checksum (ip4);
-
-  if (!vnet_buffer (p)->ip.reass.is_non_first_fragment)
-    {
-      udp_header_t *udp = (udp_header_t *) (ip4 + 1);
-      udp->src_port = bibe->out_port;
-
-      //UDP checksum is optional over IPv4
-      if (proto == IP_PROTOCOL_UDP)
-	{
-	  udp->checksum = 0;
-	}
-      else
-	{
-	  tcp_header_t *tcp = (tcp_header_t *) (ip4 + 1);
-	  csum = ip_csum_sub_even (tcp->checksum, old_saddr.as_u64[0]);
-	  csum = ip_csum_sub_even (csum, old_saddr.as_u64[1]);
-	  csum = ip_csum_sub_even (csum, old_daddr.as_u64[0]);
-	  csum = ip_csum_sub_even (csum, old_daddr.as_u64[1]);
-	  csum = ip_csum_add_even (csum, ip4->dst_address.as_u32);
-	  csum = ip_csum_add_even (csum, ip4->src_address.as_u32);
-	  csum = ip_csum_sub_even (csum, sport);
-	  csum = ip_csum_add_even (csum, udp->src_port);
-	  mss_clamping (nm->sm->mss_clamping, tcp, &csum);
-	  tcp->checksum = ip_csum_fold (csum);
-
-	  nat64_tcp_session_set_state (ste, tcp, 1);
-	}
-    }
-
-  nat64_session_reset_timeout (ste, ctx->vm);
-
-  return 0;
-}
-
-static int
-nat64_in2out_icmp_set_cb (ip6_header_t * ip6, ip4_header_t * ip4, void *arg)
-{
-  nat64_main_t *nm = &nat64_main;
-  nat64_in2out_set_ctx_t *ctx = arg;
-  nat64_db_bib_entry_t *bibe;
-  nat64_db_st_entry_t *ste;
-  ip46_address_t saddr, daddr;
-  u32 sw_if_index, fib_index;
-  icmp46_header_t *icmp = ip6_next_header (ip6);
-  nat64_db_t *db = &nm->db[ctx->thread_index];
-
-  sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
-  fib_index =
-    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
-  saddr.as_u64[0] = ip6->src_address.as_u64[0];
-  saddr.as_u64[1] = ip6->src_address.as_u64[1];
-  daddr.as_u64[0] = ip6->dst_address.as_u64[0];
-  daddr.as_u64[1] = ip6->dst_address.as_u64[1];
-
-  if (icmp->type == ICMP4_echo_request || icmp->type == ICMP4_echo_reply)
-    {
-      u16 in_id = ((u16 *) (icmp))[2];
-      ste =
-	nat64_db_st_entry_find (db, &saddr, &daddr, in_id, 0,
-				IP_PROTOCOL_ICMP, fib_index, 1);
-
-      if (ste)
-	{
-	  bibe =
-	    nat64_db_bib_entry_by_index (db, IP_PROTOCOL_ICMP,
-					 ste->bibe_index);
-	  if (!bibe)
-	    return -1;
-	}
-      else
-	{
-	  bibe =
-	    nat64_db_bib_entry_find (db, &saddr, in_id,
-				     IP_PROTOCOL_ICMP, fib_index, 1);
-
-	  if (!bibe)
-	    {
-	      u16 out_id;
-	      ip4_address_t out_addr;
-	      if (nat64_alloc_out_addr_and_port
-		  (fib_index, NAT_PROTOCOL_ICMP, &out_addr, &out_id,
-		   ctx->thread_index))
-		return -1;
-
-	      bibe =
-		nat64_db_bib_entry_create (ctx->thread_index, db,
-					   &ip6->src_address, &out_addr,
-					   in_id, out_id, fib_index,
-					   IP_PROTOCOL_ICMP, 0);
-	      if (!bibe)
-		return -1;
-
-	      vlib_set_simple_counter (&nm->total_bibs, ctx->thread_index, 0,
-				       db->bib.bib_entries_num);
-	    }
-
-	  nat64_extract_ip4 (&ip6->dst_address, &daddr.ip4, fib_index);
-	  ste =
-	    nat64_db_st_entry_create (ctx->thread_index, db, bibe,
-				      &ip6->dst_address, &daddr.ip4, 0);
-	  if (!ste)
-	    return -1;
-
-	  vlib_set_simple_counter (&nm->total_sessions, ctx->thread_index, 0,
-				   db->st.st_entries_num);
-	}
-
-      nat64_session_reset_timeout (ste, ctx->vm);
-
-      ip4->src_address.as_u32 = bibe->out_addr.as_u32;
-      ((u16 *) (icmp))[2] = bibe->out_port;
-
-      ip4->dst_address.as_u32 = ste->out_r_addr.as_u32;
-    }
-  else
-    {
-      if (!vec_len (nm->addr_pool))
-	return -1;
-
-      ip4->src_address.as_u32 = nm->addr_pool[0].addr.as_u32;
-      nat64_extract_ip4 (&ip6->dst_address, &ip4->dst_address, fib_index);
-    }
-
-  return 0;
-}
-
-static int
-nat64_in2out_inner_icmp_set_cb (ip6_header_t * ip6, ip4_header_t * ip4,
-				void *arg)
-{
-  nat64_main_t *nm = &nat64_main;
-  nat64_in2out_set_ctx_t *ctx = arg;
-  nat64_db_st_entry_t *ste;
-  nat64_db_bib_entry_t *bibe;
-  ip46_address_t saddr, daddr;
-  u32 sw_if_index, fib_index;
-  u8 proto = ip6->protocol;
-  nat64_db_t *db = &nm->db[ctx->thread_index];
-
-  sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
-  fib_index =
-    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
-  saddr.as_u64[0] = ip6->src_address.as_u64[0];
-  saddr.as_u64[1] = ip6->src_address.as_u64[1];
-  daddr.as_u64[0] = ip6->dst_address.as_u64[0];
-  daddr.as_u64[1] = ip6->dst_address.as_u64[1];
-
-  if (proto == IP_PROTOCOL_ICMP6)
-    {
-      icmp46_header_t *icmp = ip6_next_header (ip6);
-      u16 in_id = ((u16 *) (icmp))[2];
-      proto = IP_PROTOCOL_ICMP;
-
-      if (!
-	  (icmp->type == ICMP4_echo_request
-	   || icmp->type == ICMP4_echo_reply))
-	return -1;
-
-      ste =
-	nat64_db_st_entry_find (db, &daddr, &saddr, in_id, 0, proto,
-				fib_index, 1);
-      if (!ste)
-	return -1;
-
-      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
-      if (!bibe)
-	return -1;
-
-      ip4->dst_address.as_u32 = bibe->out_addr.as_u32;
-      ((u16 *) (icmp))[2] = bibe->out_port;
-      ip4->src_address.as_u32 = ste->out_r_addr.as_u32;
-    }
-  else
-    {
-      udp_header_t *udp = ip6_next_header (ip6);
-      tcp_header_t *tcp = ip6_next_header (ip6);
-      u16 *checksum;
-      ip_csum_t csum;
-
-      u16 sport = udp->src_port;
-      u16 dport = udp->dst_port;
-
-      ste =
-	nat64_db_st_entry_find (db, &daddr, &saddr, dport, sport, proto,
-				fib_index, 1);
-      if (!ste)
-	return -1;
-
-      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
-      if (!bibe)
-	return -1;
-
-      ip4->dst_address.as_u32 = bibe->out_addr.as_u32;
-      udp->dst_port = bibe->out_port;
-      ip4->src_address.as_u32 = ste->out_r_addr.as_u32;
-
-      if (proto == IP_PROTOCOL_TCP)
-	checksum = &tcp->checksum;
-      else
-	checksum = &udp->checksum;
-      csum = ip_csum_sub_even (*checksum, dport);
-      csum = ip_csum_add_even (csum, udp->dst_port);
-      *checksum = ip_csum_fold (csum);
-    }
-
-  return 0;
-}
-
-typedef struct unk_proto_st_walk_ctx_t_
-{
-  ip6_address_t src_addr;
-  ip6_address_t dst_addr;
-  ip4_address_t out_addr;
-  u32 fib_index;
-  u32 thread_index;
-  u8 proto;
-} unk_proto_st_walk_ctx_t;
-
-static int
-unk_proto_st_walk (nat64_db_st_entry_t * ste, void *arg)
-{
-  nat64_main_t *nm = &nat64_main;
-  unk_proto_st_walk_ctx_t *ctx = arg;
-  nat64_db_bib_entry_t *bibe;
-  ip46_address_t saddr, daddr;
-  nat64_db_t *db = &nm->db[ctx->thread_index];
-
-  if (ip6_address_is_equal (&ste->in_r_addr, &ctx->dst_addr))
-    {
-      bibe = nat64_db_bib_entry_by_index (db, ste->proto, ste->bibe_index);
-      if (!bibe)
-	return -1;
-
-      if (ip6_address_is_equal (&bibe->in_addr, &ctx->src_addr)
-	  && bibe->fib_index == ctx->fib_index)
-	{
-	  clib_memset (&saddr, 0, sizeof (saddr));
-	  saddr.ip4.as_u32 = bibe->out_addr.as_u32;
-	  clib_memset (&daddr, 0, sizeof (daddr));
-	  nat64_extract_ip4 (&ctx->dst_addr, &daddr.ip4, ctx->fib_index);
-
-	  if (nat64_db_st_entry_find
-	      (db, &daddr, &saddr, 0, 0, ctx->proto, ctx->fib_index, 0))
-	    return -1;
-
-	  ctx->out_addr.as_u32 = bibe->out_addr.as_u32;
-	  return 1;
-	}
-    }
-
-  return 0;
-}
-
-static int
-nat64_in2out_unk_proto (vlib_main_t * vm, vlib_buffer_t * p, u8 l4_protocol,
-			u16 l4_offset, u16 frag_hdr_offset,
-			nat64_in2out_set_ctx_t * s_ctx)
-{
-  ip6_header_t *ip6;
-  ip4_header_t *ip4;
-  u16 fragment_id;
-  u16 frag_offset;
-  u8 frag_more;
-
-  ip6 = vlib_buffer_get_current (p);
-
-  ip4 = (ip4_header_t *) u8_ptr_add (ip6, l4_offset - sizeof (*ip4));
-
-  vlib_buffer_advance (p, l4_offset - sizeof (*ip4));
-
-  if (PREDICT_FALSE (frag_hdr_offset))
-    {
-      //Only the first fragment
-      ip6_frag_hdr_t *hdr =
-	(ip6_frag_hdr_t *) u8_ptr_add (ip6, frag_hdr_offset);
-      fragment_id = frag_id_6to4 (hdr->identification);
-      frag_offset = ip6_frag_hdr_offset (hdr);
-      frag_more = ip6_frag_hdr_more (hdr);
-    }
-  else
-    {
-      fragment_id = 0;
-      frag_offset = 0;
-      frag_more = 0;
-    }
-
-  nat64_main_t *nm = &nat64_main;
-  nat64_db_bib_entry_t *bibe;
-  nat64_db_st_entry_t *ste;
-  ip46_address_t saddr, daddr, addr;
-  u32 sw_if_index, fib_index;
-  int i;
-  nat64_db_t *db = &nm->db[s_ctx->thread_index];
-
-  sw_if_index = vnet_buffer (s_ctx->b)->sw_if_index[VLIB_RX];
-  fib_index =
-    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
-  saddr.as_u64[0] = ip6->src_address.as_u64[0];
-  saddr.as_u64[1] = ip6->src_address.as_u64[1];
-  daddr.as_u64[0] = ip6->dst_address.as_u64[0];
-  daddr.as_u64[1] = ip6->dst_address.as_u64[1];
-
-  ste =
-    nat64_db_st_entry_find (db, &saddr, &daddr, 0, 0, l4_protocol, fib_index,
-			    1);
-
-  if (ste)
-    {
-      bibe = nat64_db_bib_entry_by_index (db, l4_protocol, ste->bibe_index);
-      if (!bibe)
-	return -1;
-    }
-  else
-    {
-      bibe =
-	nat64_db_bib_entry_find (db, &saddr, 0, l4_protocol, fib_index, 1);
-
-      if (!bibe)
-	{
-	  /* Choose same out address as for TCP/UDP session to same dst */
-	  unk_proto_st_walk_ctx_t ctx = {
-	    .src_addr.as_u64[0] = ip6->src_address.as_u64[0],
-	    .src_addr.as_u64[1] = ip6->src_address.as_u64[1],
-	    .dst_addr.as_u64[0] = ip6->dst_address.as_u64[0],
-	    .dst_addr.as_u64[1] = ip6->dst_address.as_u64[1],
-	    .out_addr.as_u32 = 0,
-	    .fib_index = fib_index,
-	    .proto = l4_protocol,
-	    .thread_index = s_ctx->thread_index,
-	  };
-
-	  nat64_db_st_walk (db, IP_PROTOCOL_TCP, unk_proto_st_walk, &ctx);
-
-	  if (!ctx.out_addr.as_u32)
-	    nat64_db_st_walk (db, IP_PROTOCOL_UDP, unk_proto_st_walk, &ctx);
-
-	  /* Verify if out address is not already in use for protocol */
-	  clib_memset (&addr, 0, sizeof (addr));
-	  addr.ip4.as_u32 = ctx.out_addr.as_u32;
-	  if (nat64_db_bib_entry_find (db, &addr, 0, l4_protocol, 0, 0))
-	    ctx.out_addr.as_u32 = 0;
-
-	  if (!ctx.out_addr.as_u32)
-	    {
-	      for (i = 0; i < vec_len (nm->addr_pool); i++)
-		{
-		  addr.ip4.as_u32 = nm->addr_pool[i].addr.as_u32;
-		  if (!nat64_db_bib_entry_find
-		      (db, &addr, 0, l4_protocol, 0, 0))
-		    break;
-		}
-	    }
-
-	  if (!ctx.out_addr.as_u32)
-	    return -1;
-
-	  bibe =
-	    nat64_db_bib_entry_create (s_ctx->thread_index, db,
-				       &ip6->src_address, &ctx.out_addr,
-				       0, 0, fib_index, l4_protocol, 0);
-	  if (!bibe)
-	    return -1;
-
-	  vlib_set_simple_counter (&nm->total_bibs, s_ctx->thread_index, 0,
-				   db->bib.bib_entries_num);
-	}
-
-      nat64_extract_ip4 (&ip6->dst_address, &daddr.ip4, fib_index);
-      ste =
-	nat64_db_st_entry_create (s_ctx->thread_index, db, bibe,
-				  &ip6->dst_address, &daddr.ip4, 0);
-      if (!ste)
-	return -1;
-
-      vlib_set_simple_counter (&nm->total_sessions, s_ctx->thread_index, 0,
-			       db->st.st_entries_num);
-    }
-
-  nat64_session_reset_timeout (ste, s_ctx->vm);
-
-  ip4->src_address.as_u32 = bibe->out_addr.as_u32;
-  ip4->dst_address.as_u32 = ste->out_r_addr.as_u32;
-
-  ip4->ip_version_and_header_length =
-    IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS;
-  ip4->tos = ip6_translate_tos (ip6->ip_version_traffic_class_and_flow_label);
-  ip4->length = u16_net_add (ip6->payload_length,
-			     sizeof (*ip4) + sizeof (*ip6) - l4_offset);
-  ip4->fragment_id = fragment_id;
-  ip4->flags_and_fragment_offset =
-    clib_host_to_net_u16 (frag_offset |
-			  (frag_more ? IP4_HEADER_FLAG_MORE_FRAGMENTS : 0));
-  ip4->ttl = ip6->hop_limit;
-  ip4->protocol = l4_protocol;
-  ip4->checksum = ip4_header_checksum (ip4);
-
-  return 0;
-}
-
-static int
-nat64_in2out_tcp_udp_hairpinning (vlib_main_t * vm, vlib_buffer_t * b,
-				  ip6_header_t * ip6, u32 l4_offset,
-				  u32 thread_index)
-{
-  nat64_main_t *nm = &nat64_main;
-  nat64_db_bib_entry_t *bibe;
-  nat64_db_st_entry_t *ste;
-  ip46_address_t saddr, daddr;
-  u32 sw_if_index, fib_index;
-  udp_header_t *udp = (udp_header_t *) u8_ptr_add (ip6, l4_offset);
-  tcp_header_t *tcp = (tcp_header_t *) u8_ptr_add (ip6, l4_offset);
-  u8 proto = vnet_buffer (b)->ip.reass.ip_proto;
-  u16 sport = vnet_buffer (b)->ip.reass.l4_src_port;
-  u16 dport = vnet_buffer (b)->ip.reass.l4_dst_port;
-  u16 *checksum = NULL;
-  ip_csum_t csum = 0;
-  nat64_db_t *db = &nm->db[thread_index];
-
-  sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
-  fib_index =
-    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
-  saddr.as_u64[0] = ip6->src_address.as_u64[0];
-  saddr.as_u64[1] = ip6->src_address.as_u64[1];
-  daddr.as_u64[0] = ip6->dst_address.as_u64[0];
-  daddr.as_u64[1] = ip6->dst_address.as_u64[1];
-
-  if (!vnet_buffer (b)->ip.reass.is_non_first_fragment)
-    {
-      if (proto == IP_PROTOCOL_UDP)
-	checksum = &udp->checksum;
-      else
-	checksum = &tcp->checksum;
-      csum = ip_csum_sub_even (*checksum, ip6->src_address.as_u64[0]);
-      csum = ip_csum_sub_even (csum, ip6->src_address.as_u64[1]);
-      csum = ip_csum_sub_even (csum, ip6->dst_address.as_u64[0]);
-      csum = ip_csum_sub_even (csum, ip6->dst_address.as_u64[1]);
-    }
-
-  ste =
-    nat64_db_st_entry_find (db, &saddr, &daddr, sport, dport, proto,
-			    fib_index, 1);
-
-  if (ste)
-    {
-      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
-      if (!bibe)
-	return -1;
-    }
-  else
-    {
-      bibe = nat64_db_bib_entry_find (db, &saddr, sport, proto, fib_index, 1);
-
-      if (!bibe)
-	{
-	  u16 out_port;
-	  ip4_address_t out_addr;
-	  if (nat64_alloc_out_addr_and_port
-	      (fib_index, ip_proto_to_nat_proto (proto), &out_addr,
-	       &out_port, thread_index))
-	    return -1;
-
-	  bibe =
-	    nat64_db_bib_entry_create (thread_index, db, &ip6->src_address,
-				       &out_addr, sport, out_port, fib_index,
-				       proto, 0);
-	  if (!bibe)
-	    return -1;
-
-	  vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
-				   db->bib.bib_entries_num);
-	}
-
-      nat64_extract_ip4 (&ip6->dst_address, &daddr.ip4, fib_index);
-      ste =
-	nat64_db_st_entry_create (thread_index, db, bibe, &ip6->dst_address,
-				  &daddr.ip4, dport);
-      if (!ste)
-	return -1;
-
-      vlib_set_simple_counter (&nm->total_sessions, thread_index, 0,
-			       db->st.st_entries_num);
-    }
-
-  if (proto == IP_PROTOCOL_TCP)
-    nat64_tcp_session_set_state (ste, tcp, 1);
-
-  nat64_session_reset_timeout (ste, vm);
-
-  if (!vnet_buffer (b)->ip.reass.is_non_first_fragment)
-    {
-      udp->src_port = bibe->out_port;
-    }
-
-  nat64_compose_ip6 (&ip6->src_address, &bibe->out_addr, fib_index);
-
-  clib_memset (&daddr, 0, sizeof (daddr));
-  daddr.ip4.as_u32 = ste->out_r_addr.as_u32;
-
-  bibe = 0;
-  /* *INDENT-OFF* */
-  vec_foreach (db, nm->db)
-    {
-      bibe = nat64_db_bib_entry_find (db, &daddr, dport, proto, 0, 0);
-
-      if (bibe)
-	break;
-    }
-  /* *INDENT-ON* */
-
-  if (!bibe)
-    return -1;
-
-  ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0];
-  ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1];
-
-  if (!vnet_buffer (b)->ip.reass.is_non_first_fragment)
-    {
-      csum = ip_csum_add_even (csum, ip6->src_address.as_u64[0]);
-      csum = ip_csum_add_even (csum, ip6->src_address.as_u64[1]);
-      csum = ip_csum_add_even (csum, ip6->dst_address.as_u64[0]);
-      csum = ip_csum_add_even (csum, ip6->dst_address.as_u64[1]);
-      csum = ip_csum_sub_even (csum, sport);
-      csum = ip_csum_sub_even (csum, dport);
-      udp->dst_port = bibe->in_port;
-      csum = ip_csum_add_even (csum, udp->src_port);
-      csum = ip_csum_add_even (csum, udp->dst_port);
-      *checksum = ip_csum_fold (csum);
-    }
-
-  return 0;
-}
-
-static int
-nat64_in2out_icmp_hairpinning (vlib_main_t * vm, vlib_buffer_t * b,
-			       ip6_header_t * ip6, u32 thread_index)
-{
-  nat64_main_t *nm = &nat64_main;
-  nat64_db_bib_entry_t *bibe;
-  nat64_db_st_entry_t *ste;
-  icmp46_header_t *icmp = ip6_next_header (ip6);
-  ip6_header_t *inner_ip6;
-  ip46_address_t saddr, daddr;
-  u32 sw_if_index, fib_index;
-  u8 proto;
-  udp_header_t *udp;
-  tcp_header_t *tcp;
-  u16 *checksum, sport, dport;
-  ip_csum_t csum;
-  nat64_db_t *db = &nm->db[thread_index];
-
-  if (icmp->type == ICMP6_echo_request || icmp->type == ICMP6_echo_reply)
-    return -1;
-
-  inner_ip6 = (ip6_header_t *) u8_ptr_add (icmp, 8);
-
-  proto = inner_ip6->protocol;
-
-  if (proto == IP_PROTOCOL_ICMP6)
-    return -1;
-
-  sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
-  fib_index =
-    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
-  saddr.as_u64[0] = inner_ip6->src_address.as_u64[0];
-  saddr.as_u64[1] = inner_ip6->src_address.as_u64[1];
-  daddr.as_u64[0] = inner_ip6->dst_address.as_u64[0];
-  daddr.as_u64[1] = inner_ip6->dst_address.as_u64[1];
-
-  udp = ip6_next_header (inner_ip6);
-  tcp = ip6_next_header (inner_ip6);
-
-  sport = udp->src_port;
-  dport = udp->dst_port;
-
-  if (proto == IP_PROTOCOL_UDP)
-    checksum = &udp->checksum;
-  else
-    checksum = &tcp->checksum;
-
-  csum = ip_csum_sub_even (*checksum, inner_ip6->src_address.as_u64[0]);
-  csum = ip_csum_sub_even (csum, inner_ip6->src_address.as_u64[1]);
-  csum = ip_csum_sub_even (csum, inner_ip6->dst_address.as_u64[0]);
-  csum = ip_csum_sub_even (csum, inner_ip6->dst_address.as_u64[1]);
-  csum = ip_csum_sub_even (csum, sport);
-  csum = ip_csum_sub_even (csum, dport);
-
-  ste =
-    nat64_db_st_entry_find (db, &daddr, &saddr, dport, sport, proto,
-			    fib_index, 1);
-  if (!ste)
-    return -1;
-
-  bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
-  if (!bibe)
-    return -1;
-
-  dport = udp->dst_port = bibe->out_port;
-  nat64_compose_ip6 (&inner_ip6->dst_address, &bibe->out_addr, fib_index);
-
-  clib_memset (&saddr, 0, sizeof (saddr));
-  clib_memset (&daddr, 0, sizeof (daddr));
-  saddr.ip4.as_u32 = ste->out_r_addr.as_u32;
-  daddr.ip4.as_u32 = bibe->out_addr.as_u32;
-
-  ste = 0;
-  /* *INDENT-OFF* */
-  vec_foreach (db, nm->db)
-    {
-      ste = nat64_db_st_entry_find (db, &saddr, &daddr, sport, dport, proto,
-                                    0, 0);
-
-      if (ste)
-        break;
-    }
-  /* *INDENT-ON* */
-
-  if (!ste)
-    return -1;
-
-  bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
-  if (!bibe)
-    return -1;
-
-  inner_ip6->src_address.as_u64[0] = bibe->in_addr.as_u64[0];
-  inner_ip6->src_address.as_u64[1] = bibe->in_addr.as_u64[1];
-  udp->src_port = bibe->in_port;
-
-  csum = ip_csum_add_even (csum, inner_ip6->src_address.as_u64[0]);
-  csum = ip_csum_add_even (csum, inner_ip6->src_address.as_u64[1]);
-  csum = ip_csum_add_even (csum, inner_ip6->dst_address.as_u64[0]);
-  csum = ip_csum_add_even (csum, inner_ip6->dst_address.as_u64[1]);
-  csum = ip_csum_add_even (csum, udp->src_port);
-  csum = ip_csum_add_even (csum, udp->dst_port);
-  *checksum = ip_csum_fold (csum);
-
-  if (!vec_len (nm->addr_pool))
-    return -1;
-
-  nat64_compose_ip6 (&ip6->src_address, &nm->addr_pool[0].addr, fib_index);
-  ip6->dst_address.as_u64[0] = inner_ip6->src_address.as_u64[0];
-  ip6->dst_address.as_u64[1] = inner_ip6->src_address.as_u64[1];
-
-  icmp->checksum = 0;
-  csum = ip_csum_with_carry (0, ip6->payload_length);
-  csum = ip_csum_with_carry (csum, clib_host_to_net_u16 (ip6->protocol));
-  csum = ip_csum_with_carry (csum, ip6->src_address.as_u64[0]);
-  csum = ip_csum_with_carry (csum, ip6->src_address.as_u64[1]);
-  csum = ip_csum_with_carry (csum, ip6->dst_address.as_u64[0]);
-  csum = ip_csum_with_carry (csum, ip6->dst_address.as_u64[1]);
-  csum =
-    ip_incremental_checksum (csum, icmp,
-			     clib_net_to_host_u16 (ip6->payload_length));
-  icmp->checksum = ~ip_csum_fold (csum);
-
-  return 0;
-}
-
-static int
-nat64_in2out_unk_proto_hairpinning (vlib_main_t * vm, vlib_buffer_t * b,
-				    ip6_header_t * ip6, u32 thread_index)
-{
-  nat64_main_t *nm = &nat64_main;
-  nat64_db_bib_entry_t *bibe;
-  nat64_db_st_entry_t *ste;
-  ip46_address_t saddr, daddr, addr;
-  u32 sw_if_index, fib_index;
-  u8 proto = ip6->protocol;
-  int i;
-  nat64_db_t *db = &nm->db[thread_index];
-
-  sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
-  fib_index =
-    fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
-  saddr.as_u64[0] = ip6->src_address.as_u64[0];
-  saddr.as_u64[1] = ip6->src_address.as_u64[1];
-  daddr.as_u64[0] = ip6->dst_address.as_u64[0];
-  daddr.as_u64[1] = ip6->dst_address.as_u64[1];
-
-  ste =
-    nat64_db_st_entry_find (db, &saddr, &daddr, 0, 0, proto, fib_index, 1);
-
-  if (ste)
-    {
-      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
-      if (!bibe)
-	return -1;
-    }
-  else
-    {
-      bibe = nat64_db_bib_entry_find (db, &saddr, 0, proto, fib_index, 1);
-
-      if (!bibe)
-	{
-	  /* Choose same out address as for TCP/UDP session to same dst */
-	  unk_proto_st_walk_ctx_t ctx = {
-	    .src_addr.as_u64[0] = ip6->src_address.as_u64[0],
-	    .src_addr.as_u64[1] = ip6->src_address.as_u64[1],
-	    .dst_addr.as_u64[0] = ip6->dst_address.as_u64[0],
-	    .dst_addr.as_u64[1] = ip6->dst_address.as_u64[1],
-	    .out_addr.as_u32 = 0,
-	    .fib_index = fib_index,
-	    .proto = proto,
-	    .thread_index = thread_index,
-	  };
-
-	  nat64_db_st_walk (db, IP_PROTOCOL_TCP, unk_proto_st_walk, &ctx);
-
-	  if (!ctx.out_addr.as_u32)
-	    nat64_db_st_walk (db, IP_PROTOCOL_UDP, unk_proto_st_walk, &ctx);
-
-	  /* Verify if out address is not already in use for protocol */
-	  clib_memset (&addr, 0, sizeof (addr));
-	  addr.ip4.as_u32 = ctx.out_addr.as_u32;
-	  if (nat64_db_bib_entry_find (db, &addr, 0, proto, 0, 0))
-	    ctx.out_addr.as_u32 = 0;
-
-	  if (!ctx.out_addr.as_u32)
-	    {
-	      for (i = 0; i < vec_len (nm->addr_pool); i++)
-		{
-		  addr.ip4.as_u32 = nm->addr_pool[i].addr.as_u32;
-		  if (!nat64_db_bib_entry_find (db, &addr, 0, proto, 0, 0))
-		    break;
-		}
-	    }
-
-	  if (!ctx.out_addr.as_u32)
-	    return -1;
-
-	  bibe =
-	    nat64_db_bib_entry_create (thread_index, db, &ip6->src_address,
-				       &ctx.out_addr, 0, 0, fib_index, proto,
-				       0);
-	  if (!bibe)
-	    return -1;
-
-	  vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
-				   db->bib.bib_entries_num);
-	}
-
-      nat64_extract_ip4 (&ip6->dst_address, &daddr.ip4, fib_index);
-      ste =
-	nat64_db_st_entry_create (thread_index, db, bibe, &ip6->dst_address,
-				  &daddr.ip4, 0);
-      if (!ste)
-	return -1;
-
-      vlib_set_simple_counter (&nm->total_sessions, thread_index, 0,
-			       db->st.st_entries_num);
-    }
-
-  nat64_session_reset_timeout (ste, vm);
-
-  nat64_compose_ip6 (&ip6->src_address, &bibe->out_addr, fib_index);
-
-  clib_memset (&daddr, 0, sizeof (daddr));
-  daddr.ip4.as_u32 = ste->out_r_addr.as_u32;
-
-  bibe = 0;
-  /* *INDENT-OFF* */
-  vec_foreach (db, nm->db)
-    {
-      bibe = nat64_db_bib_entry_find (db, &daddr, 0, proto, 0, 0);
-
-      if (bibe)
-	break;
-    }
-  /* *INDENT-ON* */
-
-  if (!bibe)
-    return -1;
-
-  ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0];
-  ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1];
-
-  return 0;
-}
-
-static inline uword
-nat64_in2out_node_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
-			     vlib_frame_t * frame, u8 is_slow_path)
-{
-  u32 n_left_from, *from, *to_next;
-  nat64_in2out_next_t next_index;
-  u32 thread_index = vm->thread_index;
-  nat64_main_t *nm = &nat64_main;
-
-  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 > 0 && n_left_to_next > 0)
-	{
-	  u32 bi0;
-	  vlib_buffer_t *b0;
-	  u32 next0;
-	  ip6_header_t *ip60;
-	  u16 l4_offset0, frag_hdr_offset0;
-	  u8 l4_protocol0;
-	  u32 proto0;
-	  nat64_in2out_set_ctx_t ctx0;
-	  u32 sw_if_index0;
-
-	  /* 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);
-	  ip60 = vlib_buffer_get_current (b0);
-
-	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
-
-	  ctx0.b = b0;
-	  ctx0.vm = vm;
-	  ctx0.thread_index = thread_index;
-
-	  next0 = NAT64_IN2OUT_NEXT_IP4_LOOKUP;
-
-	  if (PREDICT_FALSE
-	      (ip6_parse
-	       (vm, b0, ip60, b0->current_length, &l4_protocol0, &l4_offset0,
-		&frag_hdr_offset0)))
-	    {
-	      next0 = NAT64_IN2OUT_NEXT_DROP;
-	      b0->error = node->errors[NAT64_IN2OUT_ERROR_UNKNOWN];
-	      goto trace0;
-	    }
-
-	  if (nat64_not_translate (sw_if_index0, ip60->dst_address))
-	    {
-	      next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP;
-	      goto trace0;
-	    }
-
-	  proto0 = ip_proto_to_nat_proto (l4_protocol0);
-
-	  if (is_slow_path)
-	    {
-	      if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_OTHER))
-		{
-		  vlib_increment_simple_counter (&nm->counters.in2out.other,
-						 thread_index, sw_if_index0,
-						 1);
-		  if (is_hairpinning (&ip60->dst_address))
-		    {
-		      next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP;
-		      if (nat64_in2out_unk_proto_hairpinning
-			  (vm, b0, ip60, thread_index))
-			{
-			  next0 = NAT64_IN2OUT_NEXT_DROP;
-			  b0->error =
-			    node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
-			}
-		      goto trace0;
-		    }
-
-		  if (nat64_in2out_unk_proto
-		      (vm, b0, l4_protocol0, l4_offset0, frag_hdr_offset0,
-		       &ctx0))
-		    {
-		      next0 = NAT64_IN2OUT_NEXT_DROP;
-		      b0->error =
-			node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
-		      goto trace0;
-		    }
-		}
-	      goto trace0;
-	    }
-	  else
-	    {
-	      if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
-		{
-		  next0 = NAT64_IN2OUT_NEXT_SLOWPATH;
-		  goto trace0;
-		}
-	    }
-
-	  if (proto0 == NAT_PROTOCOL_ICMP)
-	    {
-	      vlib_increment_simple_counter (&nm->counters.in2out.icmp,
-					     thread_index, sw_if_index0, 1);
-	      if (is_hairpinning (&ip60->dst_address))
-		{
-		  next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP;
-		  if (nat64_in2out_icmp_hairpinning
-		      (vm, b0, ip60, thread_index))
-		    {
-		      next0 = NAT64_IN2OUT_NEXT_DROP;
-		      b0->error =
-			node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
-		    }
-		  goto trace0;
-		}
-
-	      if (icmp6_to_icmp
-		  (vm, b0, nat64_in2out_icmp_set_cb, &ctx0,
-		   nat64_in2out_inner_icmp_set_cb, &ctx0))
-		{
-		  next0 = NAT64_IN2OUT_NEXT_DROP;
-		  b0->error = node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
-		  goto trace0;
-		}
-	    }
-	  else if (proto0 == NAT_PROTOCOL_TCP || proto0 == NAT_PROTOCOL_UDP)
-	    {
-	      if (proto0 == NAT_PROTOCOL_TCP)
-		vlib_increment_simple_counter (&nm->counters.in2out.tcp,
-					       thread_index, sw_if_index0, 1);
-	      else
-		vlib_increment_simple_counter (&nm->counters.in2out.udp,
-					       thread_index, sw_if_index0, 1);
-
-	      if (is_hairpinning (&ip60->dst_address))
-		{
-		  next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP;
-		  if (nat64_in2out_tcp_udp_hairpinning
-		      (vm, b0, ip60, l4_offset0, thread_index))
-		    {
-		      next0 = NAT64_IN2OUT_NEXT_DROP;
-		      b0->error =
-			node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
-		    }
-		  goto trace0;
-		}
-
-	      if (nat64_in2out_tcp_udp
-		  (vm, b0, l4_offset0, frag_hdr_offset0, &ctx0))
-		{
-		  next0 = NAT64_IN2OUT_NEXT_DROP;
-		  b0->error = node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
-		  goto trace0;
-		}
-	    }
-
-	trace0:
-	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
-			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
-	    {
-	      nat64_in2out_trace_t *t =
-		vlib_add_trace (vm, node, b0, sizeof (*t));
-	      t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
-	      t->next_index = next0;
-	      t->is_slow_path = is_slow_path;
-	    }
-
-	  if (next0 == NAT64_IN2OUT_NEXT_DROP)
-	    {
-	      vlib_increment_simple_counter (&nm->counters.in2out.drops,
-					     thread_index, sw_if_index0, 1);
-	    }
-
-
-	  /* 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);
-    }
-
-  return frame->n_vectors;
-}
-
-VLIB_NODE_FN (nat64_in2out_node) (vlib_main_t * vm,
-				  vlib_node_runtime_t * node,
-				  vlib_frame_t * frame)
-{
-  return nat64_in2out_node_fn_inline (vm, node, frame, 0);
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat64_in2out_node) = {
-  .name = "nat64-in2out",
-  .vector_size = sizeof (u32),
-  .format_trace = format_nat64_in2out_trace,
-  .type = VLIB_NODE_TYPE_INTERNAL,
-  .n_errors = ARRAY_LEN (nat64_in2out_error_strings),
-  .error_strings = nat64_in2out_error_strings,
-  .n_next_nodes = NAT64_IN2OUT_N_NEXT,
-  /* edit / add dispositions here */
-  .next_nodes = {
-    [NAT64_IN2OUT_NEXT_DROP] = "error-drop",
-    [NAT64_IN2OUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
-    [NAT64_IN2OUT_NEXT_IP6_LOOKUP] = "ip6-lookup",
-    [NAT64_IN2OUT_NEXT_SLOWPATH] = "nat64-in2out-slowpath",
-  },
-};
-/* *INDENT-ON* */
-
-VLIB_NODE_FN (nat64_in2out_slowpath_node) (vlib_main_t * vm,
-					   vlib_node_runtime_t * node,
-					   vlib_frame_t * frame)
-{
-  return nat64_in2out_node_fn_inline (vm, node, frame, 1);
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat64_in2out_slowpath_node) = {
-  .name = "nat64-in2out-slowpath",
-  .vector_size = sizeof (u32),
-  .format_trace = format_nat64_in2out_trace,
-  .type = VLIB_NODE_TYPE_INTERNAL,
-  .n_errors = ARRAY_LEN (nat64_in2out_error_strings),
-  .error_strings = nat64_in2out_error_strings,
-  .n_next_nodes = NAT64_IN2OUT_N_NEXT,
-  /* edit / add dispositions here */
-  .next_nodes = {
-    [NAT64_IN2OUT_NEXT_DROP] = "error-drop",
-    [NAT64_IN2OUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
-    [NAT64_IN2OUT_NEXT_IP6_LOOKUP] = "ip6-lookup",
-    [NAT64_IN2OUT_NEXT_SLOWPATH] = "nat64-in2out-slowpath",
-  },
-};
-/* *INDENT-ON* */
-
-typedef struct nat64_in2out_frag_set_ctx_t_
-{
-  vlib_main_t *vm;
-  u32 sess_index;
-  u32 thread_index;
-  u16 l4_offset;
-  u8 proto;
-  u8 first_frag;
-} nat64_in2out_frag_set_ctx_t;
-
-
-#define foreach_nat64_in2out_handoff_error                       \
-_(CONGESTION_DROP, "congestion drop")                            \
-_(SAME_WORKER, "same worker")                                    \
-_(DO_HANDOFF, "do handoff")
-
-typedef enum
-{
-#define _(sym,str) NAT64_IN2OUT_HANDOFF_ERROR_##sym,
-  foreach_nat64_in2out_handoff_error
-#undef _
-    NAT64_IN2OUT_HANDOFF_N_ERROR,
-} nat64_in2out_handoff_error_t;
-
-static char *nat64_in2out_handoff_error_strings[] = {
-#define _(sym,string) string,
-  foreach_nat64_in2out_handoff_error
-#undef _
-};
-
-typedef struct
-{
-  u32 next_worker_index;
-} nat64_in2out_handoff_trace_t;
-
-static u8 *
-format_nat64_in2out_handoff_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 *);
-  nat64_in2out_handoff_trace_t *t =
-    va_arg (*args, nat64_in2out_handoff_trace_t *);
-
-  s =
-    format (s, "NAT64-IN2OUT-HANDOFF: next-worker %d", t->next_worker_index);
-
-  return s;
-}
-
-VLIB_NODE_FN (nat64_in2out_handoff_node) (vlib_main_t * vm,
-					  vlib_node_runtime_t * node,
-					  vlib_frame_t * frame)
-{
-  nat64_main_t *nm = &nat64_main;
-  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
-  u32 n_enq, n_left_from, *from;
-  u16 thread_indices[VLIB_FRAME_SIZE], *ti;
-  u32 fq_index;
-  u32 thread_index = vm->thread_index;
-  u32 do_handoff = 0, same_worker = 0;
-
-  from = vlib_frame_vector_args (frame);
-  n_left_from = frame->n_vectors;
-  vlib_get_buffers (vm, from, bufs, n_left_from);
-
-  b = bufs;
-  ti = thread_indices;
-
-  fq_index = nm->fq_in2out_index;
-
-  while (n_left_from > 0)
-    {
-      ip6_header_t *ip0;
-
-      ip0 = vlib_buffer_get_current (b[0]);
-      ti[0] = nat64_get_worker_in2out (&ip0->src_address);
-
-      if (ti[0] != thread_index)
-	do_handoff++;
-      else
-	same_worker++;
-
-      if (PREDICT_FALSE
-	  ((node->flags & VLIB_NODE_FLAG_TRACE)
-	   && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
-	{
-	  nat64_in2out_handoff_trace_t *t =
-	    vlib_add_trace (vm, node, b[0], sizeof (*t));
-	  t->next_worker_index = ti[0];
-	}
-
-      n_left_from -= 1;
-      ti += 1;
-      b += 1;
-    }
-
-  n_enq =
-    vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
-				   frame->n_vectors, 1);
-
-  if (n_enq < frame->n_vectors)
-    vlib_node_increment_counter (vm, node->node_index,
-				 NAT64_IN2OUT_HANDOFF_ERROR_CONGESTION_DROP,
-				 frame->n_vectors - n_enq);
-  vlib_node_increment_counter (vm, node->node_index,
-			       NAT64_IN2OUT_HANDOFF_ERROR_SAME_WORKER,
-			       same_worker);
-  vlib_node_increment_counter (vm, node->node_index,
-			       NAT64_IN2OUT_HANDOFF_ERROR_DO_HANDOFF,
-			       do_handoff);
-
-  return frame->n_vectors;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat64_in2out_handoff_node) = {
-  .name = "nat64-in2out-handoff",
-  .vector_size = sizeof (u32),
-  .format_trace = format_nat64_in2out_handoff_trace,
-  .type = VLIB_NODE_TYPE_INTERNAL,
-  .n_errors = ARRAY_LEN(nat64_in2out_handoff_error_strings),
-  .error_strings = nat64_in2out_handoff_error_strings,
-
-  .n_next_nodes = 1,
-
-  .next_nodes = {
-    [0] = "error-drop",
-  },
-};
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */