nat: move nat64 to a subfeature

Type: refactor

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

1 files changed, 0 insertions, 801 deletions

diff --git a/src/plugins/nat/nat64_out2in.c b/src/plugins/nat/nat64_out2in.c
deleted file mode 100644
index 304215a1fa3..00000000000
--- a/src/plugins/nat/nat64_out2in.c
+++ /dev/null
@@ -1,801 +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 IPv4 to IPv6 translation (otside to inside network)
- */
-
-#include <nat/nat64.h>
-#include <nat/nat_inlines.h>
-#include <vnet/ip/ip4_to_ip6.h>
-#include <vnet/fib/ip4_fib.h>
-#include <vnet/udp/udp.h>
-
-typedef struct
-{
-  u32 sw_if_index;
-  u32 next_index;
-} nat64_out2in_trace_t;
-
-static u8 *
-format_nat64_out2in_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_out2in_trace_t *t = va_arg (*args, nat64_out2in_trace_t *);
-
-  s =
-    format (s, "NAT64-out2in: sw_if_index %d, next index %d", t->sw_if_index,
-	    t->next_index);
-
-  return s;
-}
-
-#define foreach_nat64_out2in_error                       \
-_(UNSUPPORTED_PROTOCOL, "unsupported protocol")          \
-_(NO_TRANSLATION, "no translation")                      \
-_(UNKNOWN, "unknown")
-
-typedef enum
-{
-#define _(sym,str) NAT64_OUT2IN_ERROR_##sym,
-  foreach_nat64_out2in_error
-#undef _
-    NAT64_OUT2IN_N_ERROR,
-} nat64_out2in_error_t;
-
-static char *nat64_out2in_error_strings[] = {
-#define _(sym,string) string,
-  foreach_nat64_out2in_error
-#undef _
-};
-
-typedef enum
-{
-  NAT64_OUT2IN_NEXT_IP6_LOOKUP,
-  NAT64_OUT2IN_NEXT_IP4_LOOKUP,
-  NAT64_OUT2IN_NEXT_DROP,
-  NAT64_OUT2IN_N_NEXT,
-} nat64_out2in_next_t;
-
-typedef struct nat64_out2in_set_ctx_t_
-{
-  vlib_buffer_t *b;
-  vlib_main_t *vm;
-  u32 thread_index;
-} nat64_out2in_set_ctx_t;
-
-static int
-nat64_out2in_tcp_udp (vlib_main_t * vm, vlib_buffer_t * b,
-		      nat64_out2in_set_ctx_t * ctx)
-{
-  ip4_header_t *ip4;
-  ip6_header_t *ip6;
-  ip_csum_t csum;
-  u16 *checksum = NULL;
-  ip6_frag_hdr_t *frag;
-  u32 frag_id;
-  ip4_address_t old_src, old_dst;
-
-  nat64_main_t *nm = &nat64_main;
-  nat64_db_bib_entry_t *bibe;
-  nat64_db_st_entry_t *ste;
-  ip46_address_t saddr;
-  ip46_address_t daddr;
-  ip6_address_t ip6_saddr;
-  u8 proto = vnet_buffer (b)->ip.reass.ip_proto;
-  u16 dport = vnet_buffer (b)->ip.reass.l4_dst_port;
-  u16 sport = vnet_buffer (b)->ip.reass.l4_src_port;
-  u32 sw_if_index, fib_index;
-  nat64_db_t *db = &nm->db[ctx->thread_index];
-
-  ip4 = vlib_buffer_get_current (b);
-
-  udp_header_t *udp = ip4_next_header (ip4);
-  tcp_header_t *tcp = ip4_next_header (ip4);
-  if (!vnet_buffer (b)->ip.reass.is_non_first_fragment)
-    {
-      if (ip4->protocol == IP_PROTOCOL_UDP)
-	{
-	  checksum = &udp->checksum;
-	  //UDP checksum is optional over IPv4 but mandatory for IPv6
-	  //We do not check udp->length sanity but use our safe computed value instead
-	  if (PREDICT_FALSE (!*checksum))
-	    {
-	      u16 udp_len =
-		clib_host_to_net_u16 (ip4->length) - sizeof (*ip4);
-	      csum = ip_incremental_checksum (0, udp, udp_len);
-	      csum =
-		ip_csum_with_carry (csum, clib_host_to_net_u16 (udp_len));
-	      csum =
-		ip_csum_with_carry (csum,
-				    clib_host_to_net_u16 (IP_PROTOCOL_UDP));
-	      csum =
-		ip_csum_with_carry (csum, *((u64 *) (&ip4->src_address)));
-	      *checksum = ~ip_csum_fold (csum);
-	    }
-	}
-      else
-	{
-	  checksum = &tcp->checksum;
-	}
-    }
-
-  old_src.as_u32 = ip4->src_address.as_u32;
-  old_dst.as_u32 = ip4->dst_address.as_u32;
-
-  // Deal with fragmented packets
-  u16 frag_offset = ip4_get_fragment_offset (ip4);
-  if (PREDICT_FALSE (ip4_get_fragment_more (ip4) || frag_offset))
-    {
-      ip6 =
-	(ip6_header_t *) u8_ptr_add (ip4,
-				     sizeof (*ip4) - sizeof (*ip6) -
-				     sizeof (*frag));
-      frag =
-	(ip6_frag_hdr_t *) u8_ptr_add (ip4, sizeof (*ip4) - sizeof (*frag));
-      frag_id = frag_id_4to6 (ip4->fragment_id);
-      vlib_buffer_advance (b, sizeof (*ip4) - sizeof (*ip6) - sizeof (*frag));
-    }
-  else
-    {
-      ip6 = (ip6_header_t *) (((u8 *) ip4) + sizeof (*ip4) - sizeof (*ip6));
-      vlib_buffer_advance (b, sizeof (*ip4) - sizeof (*ip6));
-      frag = NULL;
-    }
-
-  ip6->ip_version_traffic_class_and_flow_label =
-    clib_host_to_net_u32 ((6 << 28) + (ip4->tos << 20));
-  ip6->payload_length = u16_net_add (ip4->length, -sizeof (*ip4));
-  ip6->hop_limit = ip4->ttl;
-  ip6->protocol = ip4->protocol;
-
-  sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
-  fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
-
-  clib_memset (&saddr, 0, sizeof (saddr));
-  saddr.ip4.as_u32 = ip4->src_address.as_u32;
-  clib_memset (&daddr, 0, sizeof (daddr));
-  daddr.ip4.as_u32 = ip4->dst_address.as_u32;
-
-  ste =
-    nat64_db_st_entry_find (db, &daddr, &saddr, dport, sport, proto,
-			    fib_index, 0);
-  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, &daddr, dport, proto, fib_index, 0);
-
-      if (!bibe)
-	return -1;
-
-      nat64_compose_ip6 (&ip6_saddr, &old_src, bibe->fib_index);
-      ste =
-	nat64_db_st_entry_create (ctx->thread_index, db, bibe, &ip6_saddr,
-				  &saddr.ip4, sport);
-
-      if (!ste)
-	return -1;
-
-      vlib_set_simple_counter (&nm->total_sessions, ctx->thread_index, 0,
-			       db->st.st_entries_num);
-    }
-
-  ip6->src_address.as_u64[0] = ste->in_r_addr.as_u64[0];
-  ip6->src_address.as_u64[1] = ste->in_r_addr.as_u64[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];
-
-  vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
-
-  nat64_session_reset_timeout (ste, ctx->vm);
-
-  if (PREDICT_FALSE (frag != NULL))
-    {
-      frag->next_hdr = ip6->protocol;
-      frag->identification = frag_id;
-      frag->rsv = 0;
-      frag->fragment_offset_and_more =
-	ip6_frag_hdr_offset_and_more (frag_offset, 1);
-      ip6->protocol = IP_PROTOCOL_IPV6_FRAGMENTATION;
-      ip6->payload_length = u16_net_add (ip6->payload_length, sizeof (*frag));
-    }
-
-  if (!vnet_buffer (b)->ip.reass.is_non_first_fragment)
-    {
-      udp->dst_port = bibe->in_port;
-
-      if (proto == IP_PROTOCOL_TCP)
-	{
-	  nat64_tcp_session_set_state (ste, tcp, 0);
-	}
-
-      csum = ip_csum_sub_even (*checksum, dport);
-      csum = ip_csum_add_even (csum, udp->dst_port);
-      csum = ip_csum_sub_even (csum, old_src.as_u32);
-      csum = ip_csum_sub_even (csum, old_dst.as_u32);
-      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]);
-      *checksum = ip_csum_fold (csum);
-    }
-
-  return 0;
-}
-
-static int
-nat64_out2in_icmp_set_cb (vlib_buffer_t * b, ip4_header_t * ip4,
-			  ip6_header_t * ip6, void *arg)
-{
-  nat64_main_t *nm = &nat64_main;
-  nat64_out2in_set_ctx_t *ctx = arg;
-  nat64_db_bib_entry_t *bibe;
-  nat64_db_st_entry_t *ste;
-  ip46_address_t saddr, daddr;
-  ip6_address_t ip6_saddr;
-  u32 sw_if_index, fib_index;
-  icmp46_header_t *icmp = ip4_next_header (ip4);
-  nat64_db_t *db = &nm->db[ctx->thread_index];
-
-  sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
-  fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
-
-  clib_memset (&saddr, 0, sizeof (saddr));
-  saddr.ip4.as_u32 = ip4->src_address.as_u32;
-  clib_memset (&daddr, 0, sizeof (daddr));
-  daddr.ip4.as_u32 = ip4->dst_address.as_u32;
-
-  if (icmp->type == ICMP6_echo_request || icmp->type == ICMP6_echo_reply)
-    {
-      u16 out_id = ((u16 *) (icmp))[2];
-      ste =
-	nat64_db_st_entry_find (db, &daddr, &saddr, out_id, 0,
-				IP_PROTOCOL_ICMP, fib_index, 0);
-
-      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, &daddr, out_id,
-				     IP_PROTOCOL_ICMP, fib_index, 0);
-	  if (!bibe)
-	    return -1;
-
-	  nat64_compose_ip6 (&ip6_saddr, &ip4->src_address, bibe->fib_index);
-	  ste =
-	    nat64_db_st_entry_create (ctx->thread_index, db,
-				      bibe, &ip6_saddr, &saddr.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);
-
-      ip6->src_address.as_u64[0] = ste->in_r_addr.as_u64[0];
-      ip6->src_address.as_u64[1] = ste->in_r_addr.as_u64[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];
-      ((u16 *) (icmp))[2] = bibe->in_port;
-
-      vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
-    }
-  else
-    {
-      ip6_header_t *inner_ip6 = (ip6_header_t *) u8_ptr_add (icmp, 8);
-
-      nat64_compose_ip6 (&ip6->src_address, &ip4->src_address,
-			 vnet_buffer (ctx->b)->sw_if_index[VLIB_TX]);
-      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];
-    }
-
-  return 0;
-}
-
-static int
-nat64_out2in_inner_icmp_set_cb (vlib_buffer_t * b, ip4_header_t * ip4,
-				ip6_header_t * ip6, void *arg)
-{
-  nat64_main_t *nm = &nat64_main;
-  nat64_out2in_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;
-  u8 proto = ip4->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);
-
-  clib_memset (&saddr, 0, sizeof (saddr));
-  saddr.ip4.as_u32 = ip4->src_address.as_u32;
-  clib_memset (&daddr, 0, sizeof (daddr));
-  daddr.ip4.as_u32 = ip4->dst_address.as_u32;
-
-  if (proto == IP_PROTOCOL_ICMP6)
-    {
-      icmp46_header_t *icmp = ip4_next_header (ip4);
-      u16 out_id = ((u16 *) (icmp))[2];
-      proto = IP_PROTOCOL_ICMP;
-
-      if (!
-	  (icmp->type == ICMP6_echo_request
-	   || icmp->type == ICMP6_echo_reply))
-	return -1;
-
-      ste =
-	nat64_db_st_entry_find (db, &saddr, &daddr, out_id, 0, proto,
-				fib_index, 0);
-      if (!ste)
-	return -1;
-
-      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
-      if (!bibe)
-	return -1;
-
-      ip6->dst_address.as_u64[0] = ste->in_r_addr.as_u64[0];
-      ip6->dst_address.as_u64[1] = ste->in_r_addr.as_u64[1];
-      ip6->src_address.as_u64[0] = bibe->in_addr.as_u64[0];
-      ip6->src_address.as_u64[1] = bibe->in_addr.as_u64[1];
-      ((u16 *) (icmp))[2] = bibe->in_port;
-
-      vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
-    }
-  else
-    {
-      udp_header_t *udp = ip4_next_header (ip4);
-      tcp_header_t *tcp = ip4_next_header (ip4);
-      u16 dport = udp->dst_port;
-      u16 sport = udp->src_port;
-      u16 *checksum;
-      ip_csum_t csum;
-
-      ste =
-	nat64_db_st_entry_find (db, &saddr, &daddr, sport, dport, proto,
-				fib_index, 0);
-      if (!ste)
-	return -1;
-
-      bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index);
-      if (!bibe)
-	return -1;
-
-      nat64_compose_ip6 (&ip6->dst_address, &daddr.ip4, bibe->fib_index);
-      ip6->src_address.as_u64[0] = bibe->in_addr.as_u64[0];
-      ip6->src_address.as_u64[1] = bibe->in_addr.as_u64[1];
-      udp->src_port = bibe->in_port;
-
-      if (proto == IP_PROTOCOL_UDP)
-	checksum = &udp->checksum;
-      else
-	checksum = &tcp->checksum;
-      if (*checksum)
-	{
-	  csum = ip_csum_sub_even (*checksum, sport);
-	  csum = ip_csum_add_even (csum, udp->src_port);
-	  *checksum = ip_csum_fold (csum);
-	}
-
-      vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
-    }
-
-  return 0;
-}
-
-static int
-nat64_out2in_unk_proto (vlib_main_t * vm, vlib_buffer_t * p,
-			nat64_out2in_set_ctx_t * ctx)
-{
-  ip4_header_t *ip4 = vlib_buffer_get_current (p);
-  ip6_header_t *ip6;
-  ip6_frag_hdr_t *frag;
-  u32 frag_id;
-
-  nat64_main_t *nm = &nat64_main;
-  nat64_db_bib_entry_t *bibe;
-  nat64_db_st_entry_t *ste;
-  ip46_address_t saddr, daddr;
-  ip6_address_t ip6_saddr;
-  u32 sw_if_index, fib_index;
-  u8 proto = ip4->protocol;
-  nat64_db_t *db = &nm->db[ctx->thread_index];
-
-  // Deal with fragmented packets
-  u16 frag_offset = ip4_get_fragment_offset (ip4);
-  if (PREDICT_FALSE (ip4_get_fragment_more (ip4) || frag_offset))
-    {
-      ip6 =
-	(ip6_header_t *) u8_ptr_add (ip4,
-				     sizeof (*ip4) - sizeof (*ip6) -
-				     sizeof (*frag));
-      frag =
-	(ip6_frag_hdr_t *) u8_ptr_add (ip4, sizeof (*ip4) - sizeof (*frag));
-      frag_id = frag_id_4to6 (ip4->fragment_id);
-      vlib_buffer_advance (p, sizeof (*ip4) - sizeof (*ip6) - sizeof (*frag));
-    }
-  else
-    {
-      ip6 = (ip6_header_t *) (((u8 *) ip4) + sizeof (*ip4) - sizeof (*ip6));
-      vlib_buffer_advance (p, sizeof (*ip4) - sizeof (*ip6));
-      frag = NULL;
-    }
-
-  ip6->ip_version_traffic_class_and_flow_label =
-    clib_host_to_net_u32 ((6 << 28) + (ip4->tos << 20));
-  ip6->payload_length = u16_net_add (ip4->length, -sizeof (*ip4));
-  ip6->hop_limit = ip4->ttl;
-  ip6->protocol = ip4->protocol;
-
-  if (PREDICT_FALSE (frag != NULL))
-    {
-      frag->next_hdr = ip6->protocol;
-      frag->identification = frag_id;
-      frag->rsv = 0;
-      frag->fragment_offset_and_more =
-	ip6_frag_hdr_offset_and_more (frag_offset, 1);
-      ip6->protocol = IP_PROTOCOL_IPV6_FRAGMENTATION;
-      ip6->payload_length = u16_net_add (ip6->payload_length, sizeof (*frag));
-    }
-
-  sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
-  fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
-
-  clib_memset (&saddr, 0, sizeof (saddr));
-  saddr.ip4.as_u32 = ip4->src_address.as_u32;
-  clib_memset (&daddr, 0, sizeof (daddr));
-  daddr.ip4.as_u32 = ip4->dst_address.as_u32;
-
-  ste =
-    nat64_db_st_entry_find (db, &daddr, &saddr, 0, 0, proto, fib_index, 0);
-  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, &daddr, 0, proto, fib_index, 0);
-
-      if (!bibe)
-	return -1;
-
-      nat64_compose_ip6 (&ip6_saddr, &ip4->src_address, bibe->fib_index);
-      ste = nat64_db_st_entry_create (ctx->thread_index, db,
-				      bibe, &ip6_saddr, &saddr.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);
-
-  ip6->src_address.as_u64[0] = ste->in_r_addr.as_u64[0];
-  ip6->src_address.as_u64[1] = ste->in_r_addr.as_u64[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];
-
-  vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
-
-  return 0;
-}
-
-VLIB_NODE_FN (nat64_out2in_node) (vlib_main_t * vm,
-				  vlib_node_runtime_t * node,
-				  vlib_frame_t * frame)
-{
-  u32 n_left_from, *from, *to_next;
-  nat64_out2in_next_t next_index;
-  nat64_main_t *nm = &nat64_main;
-  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 > 0 && n_left_to_next > 0)
-	{
-	  u32 bi0;
-	  vlib_buffer_t *b0;
-	  u32 next0;
-	  ip4_header_t *ip40;
-	  u32 proto0;
-	  nat64_out2in_set_ctx_t ctx0;
-	  udp_header_t *udp0;
-	  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);
-	  ip40 = vlib_buffer_get_current (b0);
-
-	  ctx0.b = b0;
-	  ctx0.vm = vm;
-	  ctx0.thread_index = thread_index;
-
-	  next0 = NAT64_OUT2IN_NEXT_IP6_LOOKUP;
-
-	  proto0 = ip_proto_to_nat_proto (ip40->protocol);
-	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
-	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
-	    {
-	      if (nat64_out2in_unk_proto (vm, b0, &ctx0))
-		{
-		  next0 = NAT64_OUT2IN_NEXT_DROP;
-		  b0->error = node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
-		}
-	      vlib_increment_simple_counter (&nm->counters.out2in.other,
-					     thread_index, sw_if_index0, 1);
-	      goto trace0;
-	    }
-
-	  if (proto0 == NAT_PROTOCOL_ICMP)
-	    {
-	      vlib_increment_simple_counter (&nm->counters.out2in.icmp,
-					     thread_index, sw_if_index0, 1);
-	      if (icmp_to_icmp6
-		  (b0, nat64_out2in_icmp_set_cb, &ctx0,
-		   nat64_out2in_inner_icmp_set_cb, &ctx0))
-		{
-		  next0 = NAT64_OUT2IN_NEXT_DROP;
-		  b0->error = node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
-		  goto trace0;
-		}
-	    }
-	  else
-	    {
-	      if (proto0 == NAT_PROTOCOL_TCP)
-		vlib_increment_simple_counter (&nm->counters.out2in.tcp,
-					       thread_index, sw_if_index0, 1);
-	      else
-		vlib_increment_simple_counter (&nm->counters.out2in.udp,
-					       thread_index, sw_if_index0, 1);
-
-	      if (nat64_out2in_tcp_udp (vm, b0, &ctx0))
-		{
-		  udp0 = ip4_next_header (ip40);
-		  /*
-		   * Send DHCP packets to the ipv4 stack, or we won't
-		   * be able to use dhcp client on the outside interface
-		   */
-		  if ((proto0 == NAT_PROTOCOL_UDP)
-		      && (udp0->dst_port ==
-			  clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client)))
-		    {
-		      next0 = NAT64_OUT2IN_NEXT_IP4_LOOKUP;
-		      goto trace0;
-		    }
-		  next0 = NAT64_OUT2IN_NEXT_DROP;
-		  b0->error = node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
-		  goto trace0;
-		}
-	    }
-
-	trace0:
-	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
-			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
-	    {
-	      nat64_out2in_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;
-	    }
-
-	  if (next0 == NAT64_OUT2IN_NEXT_DROP)
-	    {
-	      vlib_increment_simple_counter (&nm->counters.out2in.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;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat64_out2in_node) = {
-  .name = "nat64-out2in",
-  .vector_size = sizeof (u32),
-  .format_trace = format_nat64_out2in_trace,
-  .type = VLIB_NODE_TYPE_INTERNAL,
-  .n_errors = ARRAY_LEN (nat64_out2in_error_strings),
-  .error_strings = nat64_out2in_error_strings,
-  .n_next_nodes = NAT64_OUT2IN_N_NEXT,
-  /* edit / add dispositions here */
-  .next_nodes = {
-    [NAT64_OUT2IN_NEXT_DROP] = "error-drop",
-    [NAT64_OUT2IN_NEXT_IP6_LOOKUP] = "ip6-lookup",
-    [NAT64_OUT2IN_NEXT_IP4_LOOKUP] = "ip4-lookup",
-  },
-};
-/* *INDENT-ON* */
-
-typedef struct nat64_out2in_frag_set_ctx_t_
-{
-  vlib_main_t *vm;
-  vlib_buffer_t *b;
-  u32 sess_index;
-  u32 thread_index;
-  u8 proto;
-  u8 first_frag;
-} nat64_out2in_frag_set_ctx_t;
-
-#define foreach_nat64_out2in_handoff_error                       \
-_(CONGESTION_DROP, "congestion drop")                            \
-_(SAME_WORKER, "same worker")                                    \
-_(DO_HANDOFF, "do handoff")
-
-typedef enum
-{
-#define _(sym,str) NAT64_OUT2IN_HANDOFF_ERROR_##sym,
-  foreach_nat64_out2in_handoff_error
-#undef _
-    NAT64_OUT2IN_HANDOFF_N_ERROR,
-} nat64_out2in_handoff_error_t;
-
-static char *nat64_out2in_handoff_error_strings[] = {
-#define _(sym,string) string,
-  foreach_nat64_out2in_handoff_error
-#undef _
-};
-
-typedef struct
-{
-  u32 next_worker_index;
-} nat64_out2in_handoff_trace_t;
-
-static u8 *
-format_nat64_out2in_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_out2in_handoff_trace_t *t =
-    va_arg (*args, nat64_out2in_handoff_trace_t *);
-
-  s =
-    format (s, "NAT64-OUT2IN-HANDOFF: next-worker %d", t->next_worker_index);
-
-  return s;
-}
-
-VLIB_NODE_FN (nat64_out2in_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_out2in_index;
-
-  while (n_left_from > 0)
-    {
-      ip4_header_t *ip0;
-
-      ip0 = vlib_buffer_get_current (b[0]);
-      ti[0] = nat64_get_worker_out2in (b[0], ip0);
-
-      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_out2in_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_OUT2IN_HANDOFF_ERROR_CONGESTION_DROP,
-				 frame->n_vectors - n_enq);
-  vlib_node_increment_counter (vm, node->node_index,
-			       NAT64_OUT2IN_HANDOFF_ERROR_SAME_WORKER,
-			       same_worker);
-  vlib_node_increment_counter (vm, node->node_index,
-			       NAT64_OUT2IN_HANDOFF_ERROR_DO_HANDOFF,
-			       do_handoff);
-
-  return frame->n_vectors;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat64_out2in_handoff_node) = {
-  .name = "nat64-out2in-handoff",
-  .vector_size = sizeof (u32),
-  .format_trace = format_nat64_out2in_handoff_trace,
-  .type = VLIB_NODE_TYPE_INTERNAL,
-  .n_errors = ARRAY_LEN(nat64_out2in_handoff_error_strings),
-  .error_strings = nat64_out2in_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:
- */