nat: move nat64 to a subfeature

Type: refactor

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

1 files changed, 0 insertions, 1294 deletions

diff --git a/src/plugins/nat/nat64.c b/src/plugins/nat/nat64.c
deleted file mode 100644
index 717cf6a630a..00000000000
--- a/src/plugins/nat/nat64.c
+++ /dev/null
@@ -1,1294 +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 implementation
- */
-
-#include <nat/nat64.h>
-#include <nat/nat64_db.h>
-#include <nat/nat_inlines.h>
-#include <vnet/fib/ip4_fib.h>
-#include <vppinfra/crc32.h>
-#include <vnet/ip/reass/ip4_sv_reass.h>
-#include <vnet/ip/reass/ip6_sv_reass.h>
-
-
-nat64_main_t nat64_main;
-
-/* *INDENT-OFF* */
-
-/* Hook up input features */
-VNET_FEATURE_INIT (nat64_in2out, static) = {
-  .arc_name = "ip6-unicast",
-  .node_name = "nat64-in2out",
-  .runs_before = VNET_FEATURES ("ip6-lookup"),
-  .runs_after = VNET_FEATURES ("ip6-sv-reassembly-feature"),
-};
-VNET_FEATURE_INIT (nat64_out2in, static) = {
-  .arc_name = "ip4-unicast",
-  .node_name = "nat64-out2in",
-  .runs_before = VNET_FEATURES ("ip4-lookup"),
-  .runs_after = VNET_FEATURES ("ip4-sv-reassembly-feature"),
-};
-VNET_FEATURE_INIT (nat64_in2out_handoff, static) = {
-  .arc_name = "ip6-unicast",
-  .node_name = "nat64-in2out-handoff",
-  .runs_before = VNET_FEATURES ("ip6-lookup"),
-  .runs_after = VNET_FEATURES ("ip6-sv-reassembly-feature"),
-};
-VNET_FEATURE_INIT (nat64_out2in_handoff, static) = {
-  .arc_name = "ip4-unicast",
-  .node_name = "nat64-out2in-handoff",
-  .runs_before = VNET_FEATURES ("ip4-lookup"),
-  .runs_after = VNET_FEATURES ("ip4-sv-reassembly-feature"),
-};
-
-
-static u8 well_known_prefix[] = {
-  0x00, 0x64, 0xff, 0x9b,
-  0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00
-};
-
-/* *INDENT-ON* */
-
-static void
-nat64_ip4_add_del_interface_address_cb (ip4_main_t * im, uword opaque,
-					u32 sw_if_index,
-					ip4_address_t * address,
-					u32 address_length,
-					u32 if_address_index, u32 is_delete)
-{
-  nat64_main_t *nm = &nat64_main;
-  int i, j;
-
-  for (i = 0; i < vec_len (nm->auto_add_sw_if_indices); i++)
-    {
-      if (sw_if_index == nm->auto_add_sw_if_indices[i])
-	{
-	  if (!is_delete)
-	    {
-	      /* Don't trip over lease renewal, static config */
-	      for (j = 0; j < vec_len (nm->addr_pool); j++)
-		if (nm->addr_pool[j].addr.as_u32 == address->as_u32)
-		  return;
-
-	      (void) nat64_add_del_pool_addr (vlib_get_thread_index (),
-					      address, ~0, 1);
-	      return;
-	    }
-	  else
-	    {
-	      (void) nat64_add_del_pool_addr (vlib_get_thread_index (),
-					      address, ~0, 0);
-	      return;
-	    }
-	}
-    }
-}
-
-u32
-nat64_get_worker_in2out (ip6_address_t * addr)
-{
-  nat64_main_t *nm = &nat64_main;
-  snat_main_t *sm = nm->sm;
-  u32 next_worker_index = nm->sm->first_worker_index;
-  u32 hash;
-
-#ifdef clib_crc32c_uses_intrinsics
-  hash = clib_crc32c ((u8 *) addr->as_u32, 16);
-#else
-  u64 tmp = addr->as_u64[0] ^ addr->as_u64[1];
-  hash = clib_xxhash (tmp);
-#endif
-
-  if (PREDICT_TRUE (is_pow2 (_vec_len (sm->workers))))
-    next_worker_index += sm->workers[hash & (_vec_len (sm->workers) - 1)];
-  else
-    next_worker_index += sm->workers[hash % _vec_len (sm->workers)];
-
-  return next_worker_index;
-}
-
-u32
-nat64_get_worker_out2in (vlib_buffer_t * b, ip4_header_t * ip)
-{
-  nat64_main_t *nm = &nat64_main;
-  snat_main_t *sm = nm->sm;
-  udp_header_t *udp;
-  u16 port;
-  u32 proto;
-
-  proto = ip_proto_to_nat_proto (ip->protocol);
-  udp = ip4_next_header (ip);
-  port = udp->dst_port;
-
-  /* unknown protocol */
-  if (PREDICT_FALSE (proto == NAT_PROTOCOL_OTHER))
-    {
-      nat64_db_t *db;
-      ip46_address_t daddr;
-      nat64_db_bib_entry_t *bibe;
-
-      clib_memset (&daddr, 0, sizeof (daddr));
-      daddr.ip4.as_u32 = ip->dst_address.as_u32;
-
-      /* *INDENT-OFF* */
-      vec_foreach (db, nm->db)
-        {
-          bibe = nat64_db_bib_entry_find (db, &daddr, 0, ip->protocol, 0, 0);
-          if (bibe)
-            return (u32) (db - nm->db);
-        }
-      /* *INDENT-ON* */
-      return vlib_get_thread_index ();
-    }
-
-  /* ICMP */
-  if (PREDICT_FALSE (ip->protocol == IP_PROTOCOL_ICMP))
-    {
-      icmp46_header_t *icmp = (icmp46_header_t *) udp;
-      icmp_echo_header_t *echo = (icmp_echo_header_t *) (icmp + 1);
-      if (!icmp_type_is_error_message
-	  (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
-	port = vnet_buffer (b)->ip.reass.l4_src_port;
-      else
-	{
-	  /* if error message, then it's not fragmented and we can access it */
-	  ip4_header_t *inner_ip = (ip4_header_t *) (echo + 1);
-	  proto = ip_proto_to_nat_proto (inner_ip->protocol);
-	  void *l4_header = ip4_next_header (inner_ip);
-	  switch (proto)
-	    {
-	    case NAT_PROTOCOL_ICMP:
-	      icmp = (icmp46_header_t *) l4_header;
-	      echo = (icmp_echo_header_t *) (icmp + 1);
-	      port = echo->identifier;
-	      break;
-	    case NAT_PROTOCOL_UDP:
-	    case NAT_PROTOCOL_TCP:
-	      port = ((tcp_udp_header_t *) l4_header)->src_port;
-	      break;
-	    default:
-	      return vlib_get_thread_index ();
-	    }
-	}
-    }
-
-  /* worker by outside port  (TCP/UDP) */
-  port = clib_net_to_host_u16 (port);
-  if (port > 1024)
-    return nm->sm->first_worker_index + ((port - 1024) / sm->port_per_thread);
-
-  return vlib_get_thread_index ();
-}
-
-clib_error_t *
-nat64_init (vlib_main_t * vm)
-{
-  nat64_main_t *nm = &nat64_main;
-  vlib_thread_main_t *tm = vlib_get_thread_main ();
-  ip4_add_del_interface_address_callback_t cb4;
-  ip4_main_t *im = &ip4_main;
-  nm->sm = &snat_main;
-  vlib_node_t *node;
-
-  vec_validate (nm->db, tm->n_vlib_mains - 1);
-
-  nm->fq_in2out_index = ~0;
-  nm->fq_out2in_index = ~0;
-
-  node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
-  nm->error_node_index = node->index;
-
-  node = vlib_get_node_by_name (vm, (u8 *) "nat64-in2out");
-  nm->in2out_node_index = node->index;
-
-  node = vlib_get_node_by_name (vm, (u8 *) "nat64-in2out-slowpath");
-  nm->in2out_slowpath_node_index = node->index;
-
-  node = vlib_get_node_by_name (vm, (u8 *) "nat64-out2in");
-  nm->out2in_node_index = node->index;
-
-  /* set session timeouts to default values */
-  nm->udp_timeout = SNAT_UDP_TIMEOUT;
-  nm->icmp_timeout = SNAT_ICMP_TIMEOUT;
-  nm->tcp_trans_timeout = SNAT_TCP_TRANSITORY_TIMEOUT;
-  nm->tcp_est_timeout = SNAT_TCP_ESTABLISHED_TIMEOUT;
-
-  nm->total_enabled_count = 0;
-
-  /* Set up the interface address add/del callback */
-  cb4.function = nat64_ip4_add_del_interface_address_cb;
-  cb4.function_opaque = 0;
-  vec_add1 (im->add_del_interface_address_callbacks, cb4);
-  nm->ip4_main = im;
-
-  /* Init counters */
-  nm->total_bibs.name = "total-bibs";
-  nm->total_bibs.stat_segment_name = "/nat64/total-bibs";
-  vlib_validate_simple_counter (&nm->total_bibs, 0);
-  vlib_zero_simple_counter (&nm->total_bibs, 0);
-  nm->total_sessions.name = "total-sessions";
-  nm->total_sessions.stat_segment_name = "/nat64/total-sessions";
-  vlib_validate_simple_counter (&nm->total_sessions, 0);
-  vlib_zero_simple_counter (&nm->total_sessions, 0);
-
-#define _(x)                                                     \
-  nm->counters.in2out.x.name = #x;                               \
-  nm->counters.in2out.x.stat_segment_name = "/nat64/in2out/" #x; \
-  nm->counters.out2in.x.name = #x;                               \
-  nm->counters.out2in.x.stat_segment_name = "/nat64/out2in/" #x;
-  foreach_nat_counter;
-#undef _
-  return 0;
-}
-
-static void nat64_free_out_addr_and_port (struct nat64_db_s *db,
-					  ip4_address_t * addr, u16 port,
-					  u8 protocol);
-
-void
-nat64_set_hash (u32 bib_buckets, uword bib_memory_size, u32 st_buckets,
-		uword st_memory_size)
-{
-  nat64_main_t *nm = &nat64_main;
-  nat64_db_t *db;
-
-  nm->bib_buckets = bib_buckets;
-  nm->bib_memory_size = bib_memory_size;
-  nm->st_buckets = st_buckets;
-  nm->st_memory_size = st_memory_size;
-
-  /* *INDENT-OFF* */
-  vec_foreach (db, nm->db)
-    {
-      if (nat64_db_init (db, bib_buckets, bib_memory_size, st_buckets,
-                         st_memory_size, nat64_free_out_addr_and_port))
-	nat_elog_err ("NAT64 DB init failed");
-    }
-  /* *INDENT-ON* */
-}
-
-int
-nat64_add_del_pool_addr (u32 thread_index,
-			 ip4_address_t * addr, u32 vrf_id, u8 is_add)
-{
-  nat64_main_t *nm = &nat64_main;
-  snat_address_t *a = 0;
-  snat_interface_t *interface;
-  int i;
-  nat64_db_t *db;
-  vlib_thread_main_t *tm = vlib_get_thread_main ();
-
-  /* Check if address already exists */
-  for (i = 0; i < vec_len (nm->addr_pool); i++)
-    {
-      if (nm->addr_pool[i].addr.as_u32 == addr->as_u32)
-	{
-	  a = nm->addr_pool + i;
-	  break;
-	}
-    }
-
-  if (is_add)
-    {
-      if (a)
-	return VNET_API_ERROR_VALUE_EXIST;
-
-      vec_add2 (nm->addr_pool, a, 1);
-      a->addr = *addr;
-      a->fib_index = ~0;
-      if (vrf_id != ~0)
-	a->fib_index =
-	  fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, vrf_id,
-					     nat_fib_src_hi);
-#define _(N, id, n, s) \
-      clib_memset (a->busy_##n##_port_refcounts, 0, sizeof(a->busy_##n##_port_refcounts)); \
-      a->busy_##n##_ports = 0; \
-      vec_validate_init_empty (a->busy_##n##_ports_per_thread, tm->n_vlib_mains - 1, 0);
-      foreach_nat_protocol
-#undef _
-    }
-  else
-    {
-      if (!a)
-	return VNET_API_ERROR_NO_SUCH_ENTRY;
-
-      if (a->fib_index != ~0)
-	fib_table_unlock (a->fib_index, FIB_PROTOCOL_IP6, nat_fib_src_hi);
-      /* Delete sessions using address */
-        /* *INDENT-OFF* */
-        vec_foreach (db, nm->db)
-          {
-            nat64_db_free_out_addr (thread_index, db, &a->addr);
-            vlib_set_simple_counter (&nm->total_bibs, db - nm->db, 0,
-                                     db->bib.bib_entries_num);
-            vlib_set_simple_counter (&nm->total_sessions, db - nm->db, 0,
-                                     db->st.st_entries_num);
-          }
-        /* *INDENT-ON* */
-      vec_del1 (nm->addr_pool, i);
-    }
-
-  /* Add/del external address to FIB */
-  /* *INDENT-OFF* */
-  pool_foreach (interface, nm->interfaces,
-  ({
-    if (nat_interface_is_inside(interface))
-      continue;
-
-    snat_add_del_addr_to_fib (addr, 32, interface->sw_if_index, is_add);
-    break;
-  }));
-  /* *INDENT-ON* */
-
-  return 0;
-}
-
-void
-nat64_pool_addr_walk (nat64_pool_addr_walk_fn_t fn, void *ctx)
-{
-  nat64_main_t *nm = &nat64_main;
-  snat_address_t *a = 0;
-
-  /* *INDENT-OFF* */
-  vec_foreach (a, nm->addr_pool)
-    {
-      if (fn (a, ctx))
-        break;
-    };
-  /* *INDENT-ON* */
-}
-
-int
-nat64_add_interface_address (u32 sw_if_index, int is_add)
-{
-  nat64_main_t *nm = &nat64_main;
-  ip4_main_t *ip4_main = nm->ip4_main;
-  ip4_address_t *first_int_addr;
-  int i;
-
-  first_int_addr = ip4_interface_first_address (ip4_main, sw_if_index, 0);
-
-  for (i = 0; i < vec_len (nm->auto_add_sw_if_indices); i++)
-    {
-      if (nm->auto_add_sw_if_indices[i] == sw_if_index)
-	{
-	  if (is_add)
-	    return VNET_API_ERROR_VALUE_EXIST;
-	  else
-	    {
-	      /* if have address remove it */
-	      if (first_int_addr)
-		(void) nat64_add_del_pool_addr (vlib_get_thread_index (),
-						first_int_addr, ~0, 0);
-	      vec_del1 (nm->auto_add_sw_if_indices, i);
-	      return 0;
-	    }
-	}
-    }
-
-  if (!is_add)
-    return VNET_API_ERROR_NO_SUCH_ENTRY;
-
-  /* add to the auto-address list */
-  vec_add1 (nm->auto_add_sw_if_indices, sw_if_index);
-
-  /* If the address is already bound - or static - add it now */
-  if (first_int_addr)
-    (void) nat64_add_del_pool_addr (vlib_get_thread_index (),
-				    first_int_addr, ~0, 1);
-
-  return 0;
-}
-
-static void
-nat64_validate_counters (nat64_main_t * nm, u32 sw_if_index)
-{
-#define _(x)                                                          \
-  vlib_validate_simple_counter (&nm->counters.in2out.x, sw_if_index); \
-  vlib_zero_simple_counter (&nm->counters.in2out.x, sw_if_index);     \
-  vlib_validate_simple_counter (&nm->counters.out2in.x, sw_if_index); \
-  vlib_zero_simple_counter (&nm->counters.out2in.x, sw_if_index);
-  foreach_nat_counter;
-#undef _
-}
-
-int
-nat64_add_del_interface (u32 sw_if_index, u8 is_inside, u8 is_add)
-{
-  vlib_main_t *vm = vlib_get_main ();
-  nat64_main_t *nm = &nat64_main;
-  snat_interface_t *interface = 0, *i;
-  snat_address_t *ap;
-  const char *feature_name, *arc_name;
-
-  /* Check if interface already exists */
-  /* *INDENT-OFF* */
-  pool_foreach (i, nm->interfaces,
-  ({
-    if (i->sw_if_index == sw_if_index)
-      {
-        interface = i;
-        break;
-      }
-  }));
-  /* *INDENT-ON* */
-
-  if (is_add)
-    {
-      if (interface)
-	goto set_flags;
-
-      pool_get (nm->interfaces, interface);
-      interface->sw_if_index = sw_if_index;
-      interface->flags = 0;
-      nat64_validate_counters (nm, sw_if_index);
-    set_flags:
-      if (is_inside)
-	interface->flags |= NAT_INTERFACE_FLAG_IS_INSIDE;
-      else
-	interface->flags |= NAT_INTERFACE_FLAG_IS_OUTSIDE;
-
-      nm->total_enabled_count++;
-      vlib_process_signal_event (vm,
-				 nm->nat64_expire_walk_node_index,
-				 NAT64_CLEANER_RESCHEDULE, 0);
-
-    }
-  else
-    {
-      if (!interface)
-	return VNET_API_ERROR_NO_SUCH_ENTRY;
-
-      if ((nat_interface_is_inside (interface)
-	   && nat_interface_is_outside (interface)))
-	interface->flags &=
-	  is_inside ? ~NAT_INTERFACE_FLAG_IS_INSIDE :
-	  ~NAT_INTERFACE_FLAG_IS_OUTSIDE;
-      else
-	pool_put (nm->interfaces, interface);
-
-      nm->total_enabled_count--;
-    }
-
-  if (!is_inside)
-    {
-      /* *INDENT-OFF* */
-      vec_foreach (ap, nm->addr_pool)
-        snat_add_del_addr_to_fib(&ap->addr, 32, sw_if_index, is_add);
-      /* *INDENT-ON* */
-    }
-
-  if (nm->sm->num_workers > 1)
-    {
-      feature_name =
-	is_inside ? "nat64-in2out-handoff" : "nat64-out2in-handoff";
-      if (nm->fq_in2out_index == ~0)
-	nm->fq_in2out_index =
-	  vlib_frame_queue_main_init (nat64_in2out_node.index, 0);
-      if (nm->fq_out2in_index == ~0)
-	nm->fq_out2in_index =
-	  vlib_frame_queue_main_init (nat64_out2in_node.index, 0);
-    }
-  else
-    feature_name = is_inside ? "nat64-in2out" : "nat64-out2in";
-
-  arc_name = is_inside ? "ip6-unicast" : "ip4-unicast";
-
-  if (is_inside)
-    {
-      int rv = ip6_sv_reass_enable_disable_with_refcnt (sw_if_index, is_add);
-      if (rv)
-	return rv;
-    }
-  else
-    {
-      int rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, is_add);
-      if (rv)
-	return rv;
-    }
-
-  return vnet_feature_enable_disable (arc_name, feature_name, sw_if_index,
-				      is_add, 0, 0);
-}
-
-void
-nat64_interfaces_walk (nat64_interface_walk_fn_t fn, void *ctx)
-{
-  nat64_main_t *nm = &nat64_main;
-  snat_interface_t *i = 0;
-
-  /* *INDENT-OFF* */
-  pool_foreach (i, nm->interfaces,
-  ({
-    if (fn (i, ctx))
-      break;
-  }));
-  /* *INDENT-ON* */
-}
-
-int
-nat64_alloc_out_addr_and_port (u32 fib_index, nat_protocol_t proto,
-			       ip4_address_t * addr, u16 * port,
-			       u32 thread_index)
-{
-  nat64_main_t *nm = &nat64_main;
-  snat_main_t *sm = nm->sm;
-  u32 worker_index = 0;
-  int rv;
-
-  if (sm->num_workers > 1)
-    worker_index = thread_index - sm->first_worker_index;
-
-  rv =
-    sm->alloc_addr_and_port (nm->addr_pool, fib_index, thread_index,
-			     proto, addr, port, sm->port_per_thread,
-			     worker_index);
-
-  return rv;
-}
-
-static void
-nat64_free_out_addr_and_port (struct nat64_db_s *db, ip4_address_t * addr,
-			      u16 port, u8 protocol)
-{
-  nat64_main_t *nm = &nat64_main;
-  int i;
-  snat_address_t *a;
-  u32 thread_index = db - nm->db;
-  nat_protocol_t proto = ip_proto_to_nat_proto (protocol);
-  u16 port_host_byte_order = clib_net_to_host_u16 (port);
-
-  for (i = 0; i < vec_len (nm->addr_pool); i++)
-    {
-      a = nm->addr_pool + i;
-      if (addr->as_u32 != a->addr.as_u32)
-	continue;
-      switch (proto)
-	{
-#define _(N, j, n, s) \
-        case NAT_PROTOCOL_##N: \
-          ASSERT (a->busy_##n##_port_refcounts[port_host_byte_order] >= 1); \
-          --a->busy_##n##_port_refcounts[port_host_byte_order]; \
-          a->busy_##n##_ports--; \
-          a->busy_##n##_ports_per_thread[thread_index]--; \
-          break;
-	  foreach_nat_protocol
-#undef _
-	default:
-	  nat_elog_notice ("unknown protocol");
-	  return;
-	}
-      break;
-    }
-}
-
-/**
- * @brief Add/delete static BIB entry in worker thread.
- */
-static uword
-nat64_static_bib_worker_fn (vlib_main_t * vm, vlib_node_runtime_t * rt,
-			    vlib_frame_t * f)
-{
-  nat64_main_t *nm = &nat64_main;
-  u32 thread_index = vm->thread_index;
-  nat64_db_t *db = &nm->db[thread_index];
-  nat64_static_bib_to_update_t *static_bib;
-  nat64_db_bib_entry_t *bibe;
-  ip46_address_t addr;
-
-  /* *INDENT-OFF* */
-  pool_foreach (static_bib, nm->static_bibs,
-  ({
-    if ((static_bib->thread_index != thread_index) || (static_bib->done))
-      continue;
-
-    if (static_bib->is_add)
-      {
-          (void) nat64_db_bib_entry_create (thread_index, db,
-                                            &static_bib->in_addr,
-                                            &static_bib->out_addr,
-                                            static_bib->in_port,
-                                            static_bib->out_port,
-                                            static_bib->fib_index,
-                                            static_bib->proto, 1);
-          vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
-                                   db->bib.bib_entries_num);
-      }
-    else
-      {
-        addr.as_u64[0] = static_bib->in_addr.as_u64[0];
-        addr.as_u64[1] = static_bib->in_addr.as_u64[1];
-        bibe = nat64_db_bib_entry_find (db, &addr, static_bib->in_port,
-                                        static_bib->proto,
-                                        static_bib->fib_index, 1);
-        if (bibe)
-          {
-            nat64_db_bib_entry_free (thread_index, db, bibe);
-            vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
-                                     db->bib.bib_entries_num);
-            vlib_set_simple_counter (&nm->total_sessions, thread_index, 0,
-                                     db->st.st_entries_num);
-          }
-      }
-
-      static_bib->done = 1;
-  }));
-  /* *INDENT-ON* */
-
-  return 0;
-}
-
-static vlib_node_registration_t nat64_static_bib_worker_node;
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat64_static_bib_worker_node, static) = {
-    .function = nat64_static_bib_worker_fn,
-    .type = VLIB_NODE_TYPE_INPUT,
-    .state = VLIB_NODE_STATE_INTERRUPT,
-    .name = "nat64-static-bib-worker",
-};
-/* *INDENT-ON* */
-
-int
-nat64_add_del_static_bib_entry (ip6_address_t * in_addr,
-				ip4_address_t * out_addr, u16 in_port,
-				u16 out_port, u8 proto, u32 vrf_id, u8 is_add)
-{
-  nat64_main_t *nm = &nat64_main;
-  nat64_db_bib_entry_t *bibe;
-  u32 fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, vrf_id,
-						     nat_fib_src_hi);
-  nat_protocol_t p = ip_proto_to_nat_proto (proto);
-  ip46_address_t addr;
-  int i;
-  snat_address_t *a;
-  u32 thread_index = 0;
-  nat64_db_t *db;
-  nat64_static_bib_to_update_t *static_bib;
-  vlib_main_t *worker_vm;
-  u32 *to_be_free = 0, *index;
-
-  if (nm->sm->num_workers > 1)
-    {
-      thread_index = nat64_get_worker_in2out (in_addr);
-      db = &nm->db[thread_index];
-    }
-  else
-    db = &nm->db[nm->sm->num_workers];
-
-  addr.as_u64[0] = in_addr->as_u64[0];
-  addr.as_u64[1] = in_addr->as_u64[1];
-  bibe =
-    nat64_db_bib_entry_find (db, &addr, clib_host_to_net_u16 (in_port),
-			     proto, fib_index, 1);
-
-  if (is_add)
-    {
-      if (bibe)
-	return VNET_API_ERROR_VALUE_EXIST;
-
-      /* outside port must be assigned to same thread as internall address */
-      if ((out_port > 1024) && (nm->sm->num_workers > 1))
-	{
-	  if (thread_index != ((out_port - 1024) / nm->sm->port_per_thread))
-	    return VNET_API_ERROR_INVALID_VALUE_2;
-	}
-
-      for (i = 0; i < vec_len (nm->addr_pool); i++)
-	{
-	  a = nm->addr_pool + i;
-	  if (out_addr->as_u32 != a->addr.as_u32)
-	    continue;
-	  switch (p)
-	    {
-#define _(N, j, n, s) \
-            case NAT_PROTOCOL_##N: \
-              if (a->busy_##n##_port_refcounts[out_port]) \
-                return VNET_API_ERROR_INVALID_VALUE; \
-	      ++a->busy_##n##_port_refcounts[out_port]; \
-              if (out_port > 1024) \
-                { \
-                  a->busy_##n##_ports++; \
-                  a->busy_##n##_ports_per_thread[thread_index]++; \
-                } \
-              break;
-	      foreach_nat_protocol
-#undef _
-	    default:
-	      clib_memset (&addr, 0, sizeof (addr));
-	      addr.ip4.as_u32 = out_addr->as_u32;
-	      if (nat64_db_bib_entry_find (db, &addr, 0, proto, fib_index, 0))
-		return VNET_API_ERROR_INVALID_VALUE;
-	    }
-	  break;
-	}
-      if (!nm->sm->num_workers)
-	{
-	  bibe =
-	    nat64_db_bib_entry_create (thread_index, db, in_addr, out_addr,
-				       clib_host_to_net_u16 (in_port),
-				       clib_host_to_net_u16 (out_port),
-				       fib_index, proto, 1);
-	  if (!bibe)
-	    return VNET_API_ERROR_UNSPECIFIED;
-
-	  vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
-				   db->bib.bib_entries_num);
-	}
-    }
-  else
-    {
-      if (!bibe)
-	return VNET_API_ERROR_NO_SUCH_ENTRY;
-
-      if (!nm->sm->num_workers)
-	{
-	  nat64_db_bib_entry_free (thread_index, db, bibe);
-	  vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
-				   db->bib.bib_entries_num);
-	}
-    }
-
-  if (nm->sm->num_workers)
-    {
-      /* *INDENT-OFF* */
-      pool_foreach (static_bib, nm->static_bibs,
-      ({
-        if (static_bib->done)
-          vec_add1 (to_be_free, static_bib - nm->static_bibs);
-      }));
-      vec_foreach (index, to_be_free)
-        pool_put_index (nm->static_bibs, index[0]);
-      /* *INDENT-ON* */
-      vec_free (to_be_free);
-      pool_get (nm->static_bibs, static_bib);
-      static_bib->in_addr.as_u64[0] = in_addr->as_u64[0];
-      static_bib->in_addr.as_u64[1] = in_addr->as_u64[1];
-      static_bib->in_port = clib_host_to_net_u16 (in_port);
-      static_bib->out_addr.as_u32 = out_addr->as_u32;
-      static_bib->out_port = clib_host_to_net_u16 (out_port);
-      static_bib->fib_index = fib_index;
-      static_bib->proto = proto;
-      static_bib->is_add = is_add;
-      static_bib->thread_index = thread_index;
-      static_bib->done = 0;
-      worker_vm = vlib_mains[thread_index];
-      if (worker_vm)
-	vlib_node_set_interrupt_pending (worker_vm,
-					 nat64_static_bib_worker_node.index);
-      else
-	return VNET_API_ERROR_UNSPECIFIED;
-    }
-
-  return 0;
-}
-
-int
-nat64_set_udp_timeout (u32 timeout)
-{
-  nat64_main_t *nm = &nat64_main;
-
-  if (timeout == 0)
-    nm->udp_timeout = SNAT_UDP_TIMEOUT;
-  else
-    nm->udp_timeout = timeout;
-
-  return 0;
-}
-
-u32
-nat64_get_udp_timeout (void)
-{
-  nat64_main_t *nm = &nat64_main;
-
-  return nm->udp_timeout;
-}
-
-int
-nat64_set_icmp_timeout (u32 timeout)
-{
-  nat64_main_t *nm = &nat64_main;
-
-  if (timeout == 0)
-    nm->icmp_timeout = SNAT_ICMP_TIMEOUT;
-  else
-    nm->icmp_timeout = timeout;
-
-  return 0;
-}
-
-u32
-nat64_get_icmp_timeout (void)
-{
-  nat64_main_t *nm = &nat64_main;
-
-  return nm->icmp_timeout;
-}
-
-int
-nat64_set_tcp_timeouts (u32 trans, u32 est)
-{
-  nat64_main_t *nm = &nat64_main;
-
-  if (trans == 0)
-    nm->tcp_trans_timeout = SNAT_TCP_TRANSITORY_TIMEOUT;
-  else
-    nm->tcp_trans_timeout = trans;
-
-  if (est == 0)
-    nm->tcp_est_timeout = SNAT_TCP_ESTABLISHED_TIMEOUT;
-  else
-    nm->tcp_est_timeout = est;
-
-  return 0;
-}
-
-u32
-nat64_get_tcp_trans_timeout (void)
-{
-  nat64_main_t *nm = &nat64_main;
-
-  return nm->tcp_trans_timeout;
-}
-
-u32
-nat64_get_tcp_est_timeout (void)
-{
-  nat64_main_t *nm = &nat64_main;
-
-  return nm->tcp_est_timeout;
-}
-
-void
-nat64_session_reset_timeout (nat64_db_st_entry_t * ste, vlib_main_t * vm)
-{
-  nat64_main_t *nm = &nat64_main;
-  u32 now = (u32) vlib_time_now (vm);
-
-  switch (ip_proto_to_nat_proto (ste->proto))
-    {
-    case NAT_PROTOCOL_ICMP:
-      ste->expire = now + nm->icmp_timeout;
-      return;
-    case NAT_PROTOCOL_TCP:
-      {
-	switch (ste->tcp_state)
-	  {
-	  case NAT64_TCP_STATE_V4_INIT:
-	  case NAT64_TCP_STATE_V6_INIT:
-	  case NAT64_TCP_STATE_V4_FIN_RCV:
-	  case NAT64_TCP_STATE_V6_FIN_RCV:
-	  case NAT64_TCP_STATE_V6_FIN_V4_FIN_RCV:
-	  case NAT64_TCP_STATE_TRANS:
-	    ste->expire = now + nm->tcp_trans_timeout;
-	    return;
-	  case NAT64_TCP_STATE_ESTABLISHED:
-	    ste->expire = now + nm->tcp_est_timeout;
-	    return;
-	  default:
-	    return;
-	  }
-      }
-    case NAT_PROTOCOL_UDP:
-      ste->expire = now + nm->udp_timeout;
-      return;
-    default:
-      ste->expire = now + nm->udp_timeout;
-      return;
-    }
-}
-
-void
-nat64_tcp_session_set_state (nat64_db_st_entry_t * ste, tcp_header_t * tcp,
-			     u8 is_ip6)
-{
-  switch (ste->tcp_state)
-    {
-    case NAT64_TCP_STATE_CLOSED:
-      {
-	if (tcp->flags & TCP_FLAG_SYN)
-	  {
-	    if (is_ip6)
-	      ste->tcp_state = NAT64_TCP_STATE_V6_INIT;
-	    else
-	      ste->tcp_state = NAT64_TCP_STATE_V4_INIT;
-	  }
-	return;
-      }
-    case NAT64_TCP_STATE_V4_INIT:
-      {
-	if (is_ip6 && (tcp->flags & TCP_FLAG_SYN))
-	  ste->tcp_state = NAT64_TCP_STATE_ESTABLISHED;
-	return;
-      }
-    case NAT64_TCP_STATE_V6_INIT:
-      {
-	if (!is_ip6 && (tcp->flags & TCP_FLAG_SYN))
-	  ste->tcp_state = NAT64_TCP_STATE_ESTABLISHED;
-	return;
-      }
-    case NAT64_TCP_STATE_ESTABLISHED:
-      {
-	if (tcp->flags & TCP_FLAG_FIN)
-	  {
-	    if (is_ip6)
-	      ste->tcp_state = NAT64_TCP_STATE_V6_FIN_RCV;
-	    else
-	      ste->tcp_state = NAT64_TCP_STATE_V4_FIN_RCV;
-	  }
-	else if (tcp->flags & TCP_FLAG_RST)
-	  {
-	    ste->tcp_state = NAT64_TCP_STATE_TRANS;
-	  }
-	return;
-      }
-    case NAT64_TCP_STATE_V4_FIN_RCV:
-      {
-	if (is_ip6 && (tcp->flags & TCP_FLAG_FIN))
-	  ste->tcp_state = NAT64_TCP_STATE_V6_FIN_V4_FIN_RCV;
-	return;
-      }
-    case NAT64_TCP_STATE_V6_FIN_RCV:
-      {
-	if (!is_ip6 && (tcp->flags & TCP_FLAG_FIN))
-	  ste->tcp_state = NAT64_TCP_STATE_V6_FIN_V4_FIN_RCV;
-	return;
-      }
-    case NAT64_TCP_STATE_TRANS:
-      {
-	if (!(tcp->flags & TCP_FLAG_RST))
-	  ste->tcp_state = NAT64_TCP_STATE_ESTABLISHED;
-	return;
-      }
-    default:
-      return;
-    }
-}
-
-int
-nat64_add_del_prefix (ip6_address_t * prefix, u8 plen, u32 vrf_id, u8 is_add)
-{
-  nat64_main_t *nm = &nat64_main;
-  nat64_prefix_t *p = 0;
-  int i;
-
-  /* Verify prefix length */
-  if (plen != 32 && plen != 40 && plen != 48 && plen != 56 && plen != 64
-      && plen != 96)
-    return VNET_API_ERROR_INVALID_VALUE;
-
-  /* Check if tenant already have prefix */
-  for (i = 0; i < vec_len (nm->pref64); i++)
-    {
-      if (nm->pref64[i].vrf_id == vrf_id)
-	{
-	  p = nm->pref64 + i;
-	  break;
-	}
-    }
-
-  if (is_add)
-    {
-      if (!p)
-	{
-	  vec_add2 (nm->pref64, p, 1);
-	  p->fib_index =
-	    fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, vrf_id,
-					       nat_fib_src_hi);
-	  p->vrf_id = vrf_id;
-	}
-
-      p->prefix.as_u64[0] = prefix->as_u64[0];
-      p->prefix.as_u64[1] = prefix->as_u64[1];
-      p->plen = plen;
-    }
-  else
-    {
-      if (!p)
-	return VNET_API_ERROR_NO_SUCH_ENTRY;
-
-      vec_del1 (nm->pref64, i);
-    }
-
-  return 0;
-}
-
-void
-nat64_prefix_walk (nat64_prefix_walk_fn_t fn, void *ctx)
-{
-  nat64_main_t *nm = &nat64_main;
-  nat64_prefix_t *p = 0;
-
-  /* *INDENT-OFF* */
-  vec_foreach (p, nm->pref64)
-    {
-      if (fn (p, ctx))
-        break;
-    };
-  /* *INDENT-ON* */
-}
-
-void
-nat64_compose_ip6 (ip6_address_t * ip6, ip4_address_t * ip4, u32 fib_index)
-{
-  nat64_main_t *nm = &nat64_main;
-  nat64_prefix_t *p, *gp = 0, *prefix = 0;
-
-  /* *INDENT-OFF* */
-  vec_foreach (p, nm->pref64)
-    {
-      if (p->fib_index == fib_index)
-        {
-          prefix = p;
-          break;
-        }
-
-      if (p->fib_index == 0)
-        gp = p;
-    };
-  /* *INDENT-ON* */
-
-  if (!prefix)
-    prefix = gp;
-
-  if (prefix)
-    {
-      clib_memcpy_fast (ip6, &p->prefix, sizeof (ip6_address_t));
-      switch (p->plen)
-	{
-	case 32:
-	  ip6->as_u32[1] = ip4->as_u32;
-	  break;
-	case 40:
-	  ip6->as_u8[5] = ip4->as_u8[0];
-	  ip6->as_u8[6] = ip4->as_u8[1];
-	  ip6->as_u8[7] = ip4->as_u8[2];
-	  ip6->as_u8[9] = ip4->as_u8[3];
-	  break;
-	case 48:
-	  ip6->as_u8[6] = ip4->as_u8[0];
-	  ip6->as_u8[7] = ip4->as_u8[1];
-	  ip6->as_u8[9] = ip4->as_u8[2];
-	  ip6->as_u8[10] = ip4->as_u8[3];
-	  break;
-	case 56:
-	  ip6->as_u8[7] = ip4->as_u8[0];
-	  ip6->as_u8[9] = ip4->as_u8[1];
-	  ip6->as_u8[10] = ip4->as_u8[2];
-	  ip6->as_u8[11] = ip4->as_u8[3];
-	  break;
-	case 64:
-	  ip6->as_u8[9] = ip4->as_u8[0];
-	  ip6->as_u8[10] = ip4->as_u8[1];
-	  ip6->as_u8[11] = ip4->as_u8[2];
-	  ip6->as_u8[12] = ip4->as_u8[3];
-	  break;
-	case 96:
-	  ip6->as_u32[3] = ip4->as_u32;
-	  break;
-	default:
-	  nat_elog_notice ("invalid prefix length");
-	  break;
-	}
-    }
-  else
-    {
-      clib_memcpy_fast (ip6, well_known_prefix, sizeof (ip6_address_t));
-      ip6->as_u32[3] = ip4->as_u32;
-    }
-}
-
-void
-nat64_extract_ip4 (ip6_address_t * ip6, ip4_address_t * ip4, u32 fib_index)
-{
-  nat64_main_t *nm = &nat64_main;
-  nat64_prefix_t *p, *gp = 0;
-  u8 plen = 0;
-
-  /* *INDENT-OFF* */
-  vec_foreach (p, nm->pref64)
-    {
-      if (p->fib_index == fib_index)
-        {
-          plen = p->plen;
-          break;
-        }
-
-      if (p->vrf_id == 0)
-        gp = p;
-    };
-  /* *INDENT-ON* */
-
-  if (!plen)
-    {
-      if (gp)
-	plen = gp->plen;
-      else
-	plen = 96;
-    }
-
-  switch (plen)
-    {
-    case 32:
-      ip4->as_u32 = ip6->as_u32[1];
-      break;
-    case 40:
-      ip4->as_u8[0] = ip6->as_u8[5];
-      ip4->as_u8[1] = ip6->as_u8[6];
-      ip4->as_u8[2] = ip6->as_u8[7];
-      ip4->as_u8[3] = ip6->as_u8[9];
-      break;
-    case 48:
-      ip4->as_u8[0] = ip6->as_u8[6];
-      ip4->as_u8[1] = ip6->as_u8[7];
-      ip4->as_u8[2] = ip6->as_u8[9];
-      ip4->as_u8[3] = ip6->as_u8[10];
-      break;
-    case 56:
-      ip4->as_u8[0] = ip6->as_u8[7];
-      ip4->as_u8[1] = ip6->as_u8[9];
-      ip4->as_u8[2] = ip6->as_u8[10];
-      ip4->as_u8[3] = ip6->as_u8[11];
-      break;
-    case 64:
-      ip4->as_u8[0] = ip6->as_u8[9];
-      ip4->as_u8[1] = ip6->as_u8[10];
-      ip4->as_u8[2] = ip6->as_u8[11];
-      ip4->as_u8[3] = ip6->as_u8[12];
-      break;
-    case 96:
-      ip4->as_u32 = ip6->as_u32[3];
-      break;
-    default:
-      nat_elog_notice ("invalid prefix length");
-      break;
-    }
-}
-
-/**
- * @brief Per worker process checking expire time for NAT64 sessions.
- */
-static uword
-nat64_expire_worker_walk_fn (vlib_main_t * vm, vlib_node_runtime_t * rt,
-			     vlib_frame_t * f)
-{
-  nat64_main_t *nm = &nat64_main;
-  u32 thread_index = vm->thread_index;
-  nat64_db_t *db = &nm->db[thread_index];
-  u32 now = (u32) vlib_time_now (vm);
-
-  nad64_db_st_free_expired (thread_index, db, now);
-  vlib_set_simple_counter (&nm->total_bibs, thread_index, 0,
-			   db->bib.bib_entries_num);
-  vlib_set_simple_counter (&nm->total_sessions, thread_index, 0,
-			   db->st.st_entries_num);
-
-  return 0;
-}
-
-static vlib_node_registration_t nat64_expire_worker_walk_node;
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat64_expire_worker_walk_node, static) = {
-    .function = nat64_expire_worker_walk_fn,
-    .type = VLIB_NODE_TYPE_INPUT,
-    .state = VLIB_NODE_STATE_INTERRUPT,
-    .name = "nat64-expire-worker-walk",
-};
-/* *INDENT-ON* */
-
-static vlib_node_registration_t nat64_expire_walk_node;
-
-/**
- * @brief Centralized process to drive per worker expire walk.
- */
-static uword
-nat64_expire_walk_fn (vlib_main_t * vm, vlib_node_runtime_t * rt,
-		      vlib_frame_t * f)
-{
-  nat64_main_t *nm = &nat64_main;
-  vlib_main_t **worker_vms = 0, *worker_vm;
-  int i;
-  uword event_type, *event_data = 0;
-
-  nm->nat64_expire_walk_node_index = nat64_expire_walk_node.index;
-
-  if (vec_len (vlib_mains) == 0)
-    vec_add1 (worker_vms, vm);
-  else
-    {
-      for (i = 0; i < vec_len (vlib_mains); i++)
-	{
-	  worker_vm = vlib_mains[i];
-	  if (worker_vm)
-	    vec_add1 (worker_vms, worker_vm);
-	}
-    }
-
-  while (1)
-    {
-      if (nm->total_enabled_count)
-	{
-	  vlib_process_wait_for_event_or_clock (vm, 10.0);
-	  event_type = vlib_process_get_events (vm, &event_data);
-	}
-      else
-	{
-	  vlib_process_wait_for_event (vm);
-	  event_type = vlib_process_get_events (vm, &event_data);
-	}
-
-      switch (event_type)
-	{
-	case ~0:
-	  break;
-	case NAT64_CLEANER_RESCHEDULE:
-	  break;
-	default:
-	  nat_elog_notice_X1 ("unknown event %d", "i4", event_type);
-	  break;
-	}
-
-      for (i = 0; i < vec_len (worker_vms); i++)
-	{
-	  worker_vm = worker_vms[i];
-	  vlib_node_set_interrupt_pending (worker_vm,
-					   nat64_expire_worker_walk_node.index);
-	}
-    }
-
-  return 0;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat64_expire_walk_node, static) = {
-    .function = nat64_expire_walk_fn,
-    .type = VLIB_NODE_TYPE_PROCESS,
-    .name = "nat64-expire-walk",
-};
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */