nat: nat44-ed configuration refactor & cleanup
[vpp.git] / src / plugins / nat / nat44-ed / nat44_ed.c
index dcd7ae0..4e13907 100644 (file)
@@ -385,43 +385,15 @@ is_snat_address_used_in_static_mapping (snat_main_t * sm, ip4_address_t addr)
   snat_static_mapping_t *m;
   pool_foreach (m, sm->static_mappings)
    {
-      if (is_addr_only_static_mapping (m) ||
-          is_out2in_only_static_mapping (m) ||
-          is_identity_static_mapping (m))
-        continue;
-      if (m->external_addr.as_u32 == addr.as_u32)
-        return 1;
+     if (is_sm_addr_only (m->flags) || is_sm_out2in_only (m->flags) ||
+        is_sm_identity_nat (m->flags))
+       continue;
+     if (m->external_addr.as_u32 == addr.as_u32)
+       return 1;
   }
-
   return 0;
 }
 
-static void
-snat_add_static_mapping_when_resolved (snat_main_t *sm, ip4_address_t l_addr,
-                                      u16 l_port, u32 sw_if_index, u16 e_port,
-                                      u32 vrf_id, nat_protocol_t proto,
-                                      int addr_only, u8 *tag, int twice_nat,
-                                      int out2in_only, int identity_nat,
-                                      ip4_address_t pool_addr, int exact)
-{
-  snat_static_map_resolve_t *rp;
-
-  vec_add2 (sm->to_resolve, rp, 1);
-  rp->l_addr.as_u32 = l_addr.as_u32;
-  rp->l_port = l_port;
-  rp->sw_if_index = sw_if_index;
-  rp->e_port = e_port;
-  rp->vrf_id = vrf_id;
-  rp->proto = proto;
-  rp->addr_only = addr_only;
-  rp->twice_nat = twice_nat;
-  rp->out2in_only = out2in_only;
-  rp->identity_nat = identity_nat;
-  rp->tag = vec_dup (tag);
-  rp->pool_addr = pool_addr;
-  rp->exact = exact;
-}
-
 u32
 get_thread_idx_by_port (u16 e_port)
 {
@@ -481,610 +453,814 @@ nat_ed_static_mapping_del_sessions (snat_main_t * sm,
 }
 
 int
-snat_add_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
-                        u16 l_port, u16 e_port, u32 vrf_id, int addr_only,
-                        u32 sw_if_index, nat_protocol_t proto, int is_add,
-                        twice_nat_type_t twice_nat, u8 out2in_only, u8 *tag,
-                        u8 identity_nat, ip4_address_t pool_addr, int exact)
+nat44_ed_reserve_port (ip4_address_t addr, u16 port, nat_protocol_t proto)
 {
+  u32 ti = get_thread_idx_by_port (port);
   snat_main_t *sm = &snat_main;
-  snat_static_mapping_t *m;
-  clib_bihash_kv_8_8_t kv, value;
   snat_address_t *a = 0;
-  u32 fib_index = ~0;
-  snat_interface_t *interface;
-  snat_main_per_thread_data_t *tsm;
-  snat_static_map_resolve_t *rp, *rp_match = 0;
-  nat44_lb_addr_port_t *local;
-  u32 find = ~0;
   int i;
 
-  /* If the external address is a specific interface address */
-  if (sw_if_index != ~0)
+  for (i = 0; i < vec_len (sm->addresses); i++)
     {
-      ip4_address_t *first_int_addr;
-
-      for (i = 0; i < vec_len (sm->to_resolve); i++)
-       {
-         rp = sm->to_resolve + i;
-         if (rp->sw_if_index != sw_if_index ||
-             rp->l_addr.as_u32 != l_addr.as_u32 ||
-             rp->vrf_id != vrf_id || rp->addr_only != addr_only)
-           continue;
+      a = sm->addresses + i;
 
-         if (!addr_only)
-           {
-             if ((rp->l_port != l_port && rp->e_port != e_port)
-                 || rp->proto != proto)
-               continue;
-           }
+      if (a->addr.as_u32 != addr.as_u32)
+       continue;
 
-         rp_match = rp;
-         break;
+      switch (proto)
+       {
+#define _(N, j, n, s)                                                         \
+  case NAT_PROTOCOL_##N:                                                      \
+    if (a->busy_##n##_port_refcounts[port])                                   \
+      goto done;                                                              \
+    ++a->busy_##n##_port_refcounts[port];                                     \
+    if (port > 1024)                                                          \
+      {                                                                       \
+       a->busy_##n##_ports++;                                                \
+       a->busy_##n##_ports_per_thread[ti]++;                                 \
+      }                                                                       \
+    break;
+         foreach_nat_protocol
+#undef _
+           default : nat_elog_info (sm, "unknown protocol");
+         goto done;
        }
 
-      /* Might be already set... */
-      first_int_addr = ip4_interface_first_address
-       (sm->ip4_main, sw_if_index, 0 /* just want the address */ );
+      return 0;
+    }
 
-      if (is_add)
-       {
-         if (rp_match)
-           return VNET_API_ERROR_VALUE_EXIST;
+done:
+  return 1;
+}
 
-         snat_add_static_mapping_when_resolved (
-           sm, l_addr, l_port, sw_if_index, e_port, vrf_id, proto, addr_only,
-           tag, twice_nat, out2in_only, identity_nat, pool_addr, exact);
+int
+nat44_ed_free_port (ip4_address_t addr, u16 port, nat_protocol_t proto)
+{
+  u32 ti = get_thread_idx_by_port (port);
+  snat_main_t *sm = &snat_main;
+  snat_address_t *a = 0;
+  int i;
 
-         /* DHCP resolution required? */
-         if (first_int_addr == 0)
-           {
-             return 0;
-           }
-         else
-           {
-             e_addr.as_u32 = first_int_addr->as_u32;
-             /* Identity mapping? */
-             if (l_addr.as_u32 == 0)
-               l_addr.as_u32 = e_addr.as_u32;
-           }
-       }
-      else
-       {
-         if (!rp_match)
-           return VNET_API_ERROR_NO_SUCH_ENTRY;
+  for (i = 0; i < vec_len (sm->addresses); i++)
+    {
+      a = sm->addresses + i;
 
-         vec_del1 (sm->to_resolve, i);
+      if (a->addr.as_u32 != addr.as_u32)
+       continue;
 
-         if (first_int_addr)
-           {
-             e_addr.as_u32 = first_int_addr->as_u32;
-             /* Identity mapping? */
-             if (l_addr.as_u32 == 0)
-               l_addr.as_u32 = e_addr.as_u32;
-           }
-         else
-           return 0;
+      switch (proto)
+       {
+#define _(N, j, n, s)                                                         \
+  case NAT_PROTOCOL_##N:                                                      \
+    --a->busy_##n##_port_refcounts[port];                                     \
+    if (port > 1024)                                                          \
+      {                                                                       \
+       a->busy_##n##_ports--;                                                \
+       a->busy_##n##_ports_per_thread[ti]--;                                 \
+      }                                                                       \
+    break;
+         foreach_nat_protocol
+#undef _
+           default : nat_elog_info (sm, "unknown protocol");
+         goto done;
        }
+
+      return 0;
     }
 
-  init_nat_k (&kv, e_addr, addr_only ? 0 : e_port, 0, addr_only ? 0 : proto);
-  if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
-    m = 0;
-  else
-    m = pool_elt_at_index (sm->static_mappings, value.value);
+done:
+  return 1;
+}
 
-  if (is_add)
-    {
-      if (m)
-       {
-         if (is_identity_static_mapping (m))
-           {
-              pool_foreach (local, m->locals)
-               {
-                if (local->vrf_id == vrf_id)
-                  return VNET_API_ERROR_VALUE_EXIST;
-              }
-             pool_get (m->locals, local);
-             local->vrf_id = vrf_id;
-             local->fib_index =
-               fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id,
-                                                  sm->fib_src_low);
-             init_nat_kv (&kv, m->local_addr, m->local_port, local->fib_index,
-                          m->proto, 0, m - sm->static_mappings);
-             clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1);
-             return 0;
-           }
-         else
-           return VNET_API_ERROR_VALUE_EXIST;
-       }
+void
+nat44_ed_add_resolve_record (ip4_address_t l_addr, u16 l_port, u16 e_port,
+                            nat_protocol_t proto, u32 vrf_id, u32 sw_if_index,
+                            u32 flags, ip4_address_t pool_addr, u8 *tag)
+{
+  snat_static_map_resolve_t *rp;
+  snat_main_t *sm = &snat_main;
 
-      if (twice_nat && addr_only)
-       return VNET_API_ERROR_UNSUPPORTED;
+  vec_add2 (sm->to_resolve, rp, 1);
+  rp->l_addr.as_u32 = l_addr.as_u32;
+  rp->l_port = l_port;
+  rp->e_port = e_port;
+  rp->sw_if_index = sw_if_index;
+  rp->vrf_id = vrf_id;
+  rp->proto = proto;
+  rp->flags = flags;
+  rp->pool_addr = pool_addr;
+  rp->tag = vec_dup (tag);
+}
 
-      /* Convert VRF id to FIB index */
-      if (vrf_id != ~0)
-       fib_index =
-         fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id,
-                                            sm->fib_src_low);
-      /* If not specified use inside VRF id from SNAT plugin startup config */
-      else
-       {
-         fib_index = sm->inside_fib_index;
-         vrf_id = sm->inside_vrf_id;
-         fib_table_lock (fib_index, FIB_PROTOCOL_IP4, sm->fib_src_low);
-       }
+int
+nat44_ed_get_resolve_record (ip4_address_t l_addr, u16 l_port, u16 e_port,
+                            nat_protocol_t proto, u32 vrf_id, u32 sw_if_index,
+                            u32 flags, int *out)
+{
+  snat_static_map_resolve_t *rp;
+  snat_main_t *sm = &snat_main;
+  int i;
 
-      if (!(out2in_only || identity_nat))
-       {
-         init_nat_k (&kv, l_addr, addr_only ? 0 : l_port, fib_index,
-                     addr_only ? 0 : proto);
-         if (!clib_bihash_search_8_8
-             (&sm->static_mapping_by_local, &kv, &value))
-           return VNET_API_ERROR_VALUE_EXIST;
-       }
+  for (i = 0; i < vec_len (sm->to_resolve); i++)
+    {
+      rp = sm->to_resolve + i;
 
-      /* Find external address in allocated addresses and reserve port for
-         address and port pair mapping when dynamic translations enabled */
-      if (!(addr_only || sm->static_mapping_only || out2in_only))
+      if (rp->sw_if_index == sw_if_index && rp->vrf_id == vrf_id)
        {
-         for (i = 0; i < vec_len (sm->addresses); i++)
+         if (is_sm_identity_nat (rp->flags) && is_sm_identity_nat (flags))
            {
-             if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
+             if (!(is_sm_addr_only (rp->flags) && is_sm_addr_only (flags)))
                {
-                 a = sm->addresses + i;
-                 /* External port must be unused */
-                 switch (proto)
+                 if (rp->e_port != e_port || rp->proto != proto)
                    {
-#define _(N, j, n, s) \
-                    case NAT_PROTOCOL_##N: \
-                      if (a->busy_##n##_port_refcounts[e_port]) \
-                        return VNET_API_ERROR_INVALID_VALUE; \
-                      ++a->busy_##n##_port_refcounts[e_port]; \
-                      if (e_port > 1024) \
-                        { \
-                          a->busy_##n##_ports++; \
-                          a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]++; \
-                        } \
-                      break;
-                     foreach_nat_protocol
-#undef _
-                       default : nat_elog_info (sm, "unknown protocol");
-                     return VNET_API_ERROR_INVALID_VALUE_2;
+                     continue;
                    }
-                 break;
                }
            }
-         /* External address must be allocated */
-         if (!a && (l_addr.as_u32 != e_addr.as_u32))
+         else if (rp->l_addr.as_u32 == l_addr.as_u32)
            {
-             if (sw_if_index != ~0)
+             if (!(is_sm_addr_only (rp->flags) && is_sm_addr_only (flags)))
                {
-                 for (i = 0; i < vec_len (sm->to_resolve); i++)
+                 if (rp->l_port != l_port || rp->e_port != e_port ||
+                     rp->proto != proto)
                    {
-                     rp = sm->to_resolve + i;
-                     if (rp->addr_only)
-                       continue;
-                     if (rp->sw_if_index != sw_if_index &&
-                         rp->l_addr.as_u32 != l_addr.as_u32 &&
-                         rp->vrf_id != vrf_id && rp->l_port != l_port &&
-                         rp->e_port != e_port && rp->proto != proto)
-                       continue;
-
-                     vec_del1 (sm->to_resolve, i);
-                     break;
+                     continue;
                    }
                }
-             return VNET_API_ERROR_NO_SUCH_ENTRY;
            }
+         else
+           {
+             continue;
+           }
+         if (out)
+           {
+             *out = i;
+           }
+         return 0;
+       }
+    }
+  return 1;
+}
+
+int
+nat44_ed_del_resolve_record (ip4_address_t l_addr, u16 l_port, u16 e_port,
+                            nat_protocol_t proto, u32 vrf_id, u32 sw_if_index,
+                            u32 flags)
+{
+  snat_main_t *sm = &snat_main;
+  int i;
+  if (!nat44_ed_get_resolve_record (l_addr, l_port, e_port, proto, vrf_id,
+                                   sw_if_index, flags, &i))
+    {
+      vec_del1 (sm->to_resolve, i);
+      return 0;
+    }
+  return 1;
+}
+
+static_always_inline int
+nat44_ed_validate_sm_input (u32 flags)
+{
+  // identity nat can be initiated only from inside interface
+  if (is_sm_identity_nat (flags) && is_sm_out2in_only (flags))
+    {
+      return VNET_API_ERROR_UNSUPPORTED;
+    }
+
+  if (is_sm_twice_nat (flags) || is_sm_self_twice_nat (flags))
+    {
+      if (is_sm_addr_only (flags) || is_sm_identity_nat (flags))
+       {
+         return VNET_API_ERROR_UNSUPPORTED;
        }
+    }
+  return 0;
+}
+
+int
+nat44_ed_add_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
+                            u16 l_port, u16 e_port, nat_protocol_t proto,
+                            u32 vrf_id, u32 sw_if_index, u32 flags,
+                            ip4_address_t pool_addr, u8 *tag)
+{
+  snat_main_t *sm = &snat_main;
+  clib_bihash_kv_8_8_t kv, value;
+  snat_interface_t *interface;
+  nat44_lb_addr_port_t *local;
+  snat_static_mapping_t *m;
+  u32 fib_index = ~0;
+  int rv;
+
+  rv = nat44_ed_validate_sm_input (flags);
+  if (rv != 0)
+    {
+      return rv;
+    }
 
-      pool_get (sm->static_mappings, m);
-      clib_memset (m, 0, sizeof (*m));
-      m->tag = vec_dup (tag);
-      m->local_addr = l_addr;
-      m->external_addr = e_addr;
-      m->twice_nat = twice_nat;
+  if (is_sm_addr_only (flags))
+    {
+      e_port = l_port = proto = 0;
+    }
+
+  if (is_sm_switch_address (flags))
+    {
+      // this mapping is interface bound
+      ip4_address_t *first_int_addr;
 
-      if (twice_nat == TWICE_NAT && exact)
+      // check if this record isn't registered for resolve
+      if (!nat44_ed_get_resolve_record (l_addr, l_port, e_port, proto, vrf_id,
+                                       sw_if_index, flags, 0))
        {
-         m->flags |= NAT_STATIC_MAPPING_FLAG_EXACT_ADDRESS;
-         m->pool_addr = pool_addr;
+         return VNET_API_ERROR_VALUE_EXIST;
        }
+      // register record for resolve
+      nat44_ed_add_resolve_record (l_addr, l_port, e_port, proto, vrf_id,
+                                  sw_if_index, flags, pool_addr, tag);
 
-      if (out2in_only)
-       m->flags |= NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY;
-      if (addr_only)
-       m->flags |= NAT_STATIC_MAPPING_FLAG_ADDR_ONLY;
-      if (identity_nat)
+      first_int_addr =
+       ip4_interface_first_address (sm->ip4_main, sw_if_index, 0);
+      if (!first_int_addr)
        {
-         m->flags |= NAT_STATIC_MAPPING_FLAG_IDENTITY_NAT;
-         pool_get (m->locals, local);
-         local->vrf_id = vrf_id;
-         local->fib_index = fib_index;
+         // dhcp resolution required
+         return 0;
        }
-      else
+
+      e_addr.as_u32 = first_int_addr->as_u32;
+    }
+
+  if (is_sm_identity_nat (flags))
+    {
+      l_port = e_port;
+      l_addr.as_u32 = e_addr.as_u32;
+    }
+
+  // fib index 0
+  init_nat_k (&kv, e_addr, e_port, 0, proto);
+
+  if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
+    {
+      m = pool_elt_at_index (sm->static_mappings, value.value);
+      if (!is_sm_identity_nat (m->flags))
        {
-         m->vrf_id = vrf_id;
-         m->fib_index = fib_index;
+         return VNET_API_ERROR_VALUE_EXIST;
        }
-      if (!addr_only)
+
+      // case:
+      // adding local identity nat record for different vrf table
+      pool_foreach (local, m->locals)
        {
-         m->local_port = l_port;
-         m->external_port = e_port;
-         m->proto = proto;
+         if (local->vrf_id == vrf_id)
+           {
+             return VNET_API_ERROR_VALUE_EXIST;
+           }
        }
 
-      if (sm->num_workers > 1)
+      pool_get (m->locals, local);
+
+      local->vrf_id = vrf_id;
+      local->fib_index = fib_table_find_or_create_and_lock (
+       FIB_PROTOCOL_IP4, vrf_id, sm->fib_src_low);
+
+      init_nat_kv (&kv, m->local_addr, m->local_port, local->fib_index,
+                  m->proto, 0, m - sm->static_mappings);
+      clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1);
+
+      return 0;
+    }
+
+  if (vrf_id != ~0)
+    {
+      fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id,
+                                                    sm->fib_src_low);
+    }
+  else
+    {
+      // fallback to default vrf
+      vrf_id = sm->inside_vrf_id;
+      fib_index = sm->inside_fib_index;
+      fib_table_lock (fib_index, FIB_PROTOCOL_IP4, sm->fib_src_low);
+    }
+
+  // test if local mapping record doesn't exist
+  // identity nat supports multiple records in local mapping
+  if (!(is_sm_out2in_only (flags) || is_sm_identity_nat (flags)))
+    {
+      init_nat_k (&kv, l_addr, l_port, fib_index, proto);
+      if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
        {
-         ip4_header_t ip = {
-           .src_address = m->local_addr,
-         };
-         vec_add1 (m->workers, nat44_ed_get_in2out_worker_index (
-                                 0, &ip, m->fib_index, 0));
-         tsm = vec_elt_at_index (sm->per_thread_data, m->workers[0]);
+         return VNET_API_ERROR_VALUE_EXIST;
        }
-      else
-       tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
+    }
 
-      if (!out2in_only)
+  if (!(is_sm_out2in_only (flags) || is_sm_addr_only (flags) ||
+       sm->static_mapping_only))
+    {
+      if (nat44_ed_reserve_port (e_addr, e_port, proto))
        {
-         init_nat_kv (&kv, m->local_addr, m->local_port, fib_index, m->proto,
-                      0, m - sm->static_mappings);
-         clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1);
+         // remove resolve record
+         if (is_sm_switch_address (flags) && !is_sm_identity_nat (flags))
+           {
+             nat44_ed_del_resolve_record (l_addr, l_port, e_port, proto,
+                                          vrf_id, sw_if_index, flags);
+           }
+         return VNET_API_ERROR_NO_SUCH_ENTRY;
        }
+    }
 
-      init_nat_kv (&kv, m->external_addr, m->external_port, 0, m->proto, 0,
-                  m - sm->static_mappings);
-      clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 1);
+  pool_get (sm->static_mappings, m);
+  clib_memset (m, 0, sizeof (*m));
+
+  m->flags = flags;
+  m->local_addr = l_addr;
+  m->external_addr = e_addr;
+
+  m->tag = vec_dup (tag);
+
+  if (is_sm_exact_address (flags) && is_sm_twice_nat (flags))
+    {
+      m->pool_addr = pool_addr;
+    }
+
+  if (!is_sm_addr_only (flags))
+    {
+      m->local_port = l_port;
+      m->external_port = e_port;
+      m->proto = proto;
+    }
+
+  if (is_sm_identity_nat (flags))
+    {
+      pool_get (m->locals, local);
+
+      local->vrf_id = vrf_id;
+      local->fib_index = fib_index;
     }
   else
     {
-      if (!m)
+      m->vrf_id = vrf_id;
+      m->fib_index = fib_index;
+    }
+
+  if (!is_sm_out2in_only (flags))
+    {
+      init_nat_kv (&kv, m->local_addr, m->local_port, fib_index, m->proto, 0,
+                  m - sm->static_mappings);
+      clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1);
+    }
+
+  init_nat_kv (&kv, m->external_addr, m->external_port, 0, m->proto, 0,
+              m - sm->static_mappings);
+  clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 1);
+
+  if (sm->num_workers > 1)
+    {
+      // store worker index for this record
+      ip4_header_t ip = {
+       .src_address = m->local_addr,
+      };
+      u32 worker_index;
+      worker_index =
+       nat44_ed_get_in2out_worker_index (0, &ip, m->fib_index, 0);
+      vec_add1 (m->workers, worker_index);
+    }
+
+  if (is_sm_identity_nat (flags) || !is_sm_addr_only (flags))
+    return 0;
+
+  pool_foreach (interface, sm->interfaces)
+    {
+      if (nat_interface_is_inside (interface))
+       continue;
+
+      snat_add_del_addr_to_fib (&e_addr, 32, interface->sw_if_index, 1);
+      break;
+    }
+
+  pool_foreach (interface, sm->output_feature_interfaces)
+    {
+      if (nat_interface_is_inside (interface))
+       continue;
+
+      snat_add_del_addr_to_fib (&e_addr, 32, interface->sw_if_index, 1);
+      break;
+    }
+
+  return 0;
+}
+
+int
+nat44_ed_del_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
+                            u16 l_port, u16 e_port, nat_protocol_t proto,
+                            u32 vrf_id, u32 sw_if_index, u32 flags)
+{
+  snat_main_per_thread_data_t *tsm;
+  snat_main_t *sm = &snat_main;
+
+  clib_bihash_kv_8_8_t kv, value;
+  snat_interface_t *interface;
+  nat44_lb_addr_port_t *local;
+  snat_static_mapping_t *m;
+  u32 fib_index = ~0;
+  int rv;
+
+  rv = nat44_ed_validate_sm_input (flags);
+  if (rv != 0)
+    {
+      return rv;
+    }
+
+  if (is_sm_addr_only (flags))
+    {
+      e_port = l_port = proto = 0;
+    }
+
+  if (is_sm_switch_address (flags))
+    {
+      // this mapping is interface bound
+      ip4_address_t *first_int_addr;
+
+      // delete record registered for resolve
+      if (nat44_ed_del_resolve_record (l_addr, l_port, e_port, proto, vrf_id,
+                                      sw_if_index, flags))
        {
-         if (sw_if_index != ~0)
-           return 0;
-         else
-           return VNET_API_ERROR_NO_SUCH_ENTRY;
+         return VNET_API_ERROR_NO_SUCH_ENTRY;
        }
 
-      if (identity_nat)
+      first_int_addr =
+       ip4_interface_first_address (sm->ip4_main, sw_if_index, 0);
+      if (!first_int_addr)
        {
-         if (vrf_id == ~0)
-           vrf_id = sm->inside_vrf_id;
+         // dhcp resolution required
+         return 0;
+       }
 
-          pool_foreach (local, m->locals)
-           {
-           if (local->vrf_id == vrf_id)
-              find = local - m->locals;
-         }
-         if (find == ~0)
-           return VNET_API_ERROR_NO_SUCH_ENTRY;
+      e_addr.as_u32 = first_int_addr->as_u32;
+    }
+
+  if (is_sm_identity_nat (flags))
+    {
+      l_port = e_port;
+      l_addr.as_u32 = e_addr.as_u32;
+    }
+
+  // fib index 0
+  init_nat_k (&kv, e_addr, e_port, 0, proto);
 
-         local = pool_elt_at_index (m->locals, find);
-         fib_index = local->fib_index;
-         pool_put (m->locals, local);
+  if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
+    {
+      if (is_sm_switch_address (flags))
+       {
+         return 0;
        }
-      else
-       fib_index = m->fib_index;
+      return VNET_API_ERROR_NO_SUCH_ENTRY;
+    }
+
+  m = pool_elt_at_index (sm->static_mappings, value.value);
 
-      /* Free external address port */
-      if (!(addr_only || sm->static_mapping_only || out2in_only))
+  if (is_sm_identity_nat (flags))
+    {
+      u8 failure = 1;
+
+      if (!is_sm_switch_address (flags))
        {
-         for (i = 0; i < vec_len (sm->addresses); i++)
+         vrf_id = sm->inside_vrf_id;
+       }
+
+      pool_foreach (local, m->locals)
+       {
+         if (local->vrf_id == vrf_id)
            {
-             if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
-               {
-                 a = sm->addresses + i;
-                 switch (proto)
-                   {
-#define _(N, j, n, s) \
-                    case NAT_PROTOCOL_##N: \
-                      --a->busy_##n##_port_refcounts[e_port]; \
-                      if (e_port > 1024) \
-                        { \
-                          a->busy_##n##_ports--; \
-                          a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]--; \
-                        } \
-                      break;
-                     foreach_nat_protocol
-#undef _
-                       default : nat_elog_info (sm, "unknown protocol");
-                     return VNET_API_ERROR_INVALID_VALUE_2;
-                   }
-                 break;
-               }
+             local = pool_elt_at_index (m->locals, local - m->locals);
+             fib_index = local->fib_index;
+             pool_put (m->locals, local);
+             failure = 0;
            }
        }
 
+      if (failure)
+       {
+         return VNET_API_ERROR_NO_SUCH_ENTRY;
+       }
+    }
+  else
+    {
+      fib_index = m->fib_index;
+    }
+
+  if (!(is_sm_out2in_only (flags) || is_sm_addr_only (flags) ||
+       sm->static_mapping_only))
+    {
+      if (nat44_ed_free_port (e_addr, e_port, proto))
+       {
+         return VNET_API_ERROR_INVALID_VALUE;
+       }
+    }
+
+  if (!is_sm_out2in_only (flags))
+    {
+      init_nat_k (&kv, l_addr, l_port, fib_index, proto);
+      clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 0);
+    }
+
+  if (!sm->static_mapping_only || sm->static_mapping_connection_tracking)
+    {
+      // delete sessions for static mapping
       if (sm->num_workers > 1)
        tsm = vec_elt_at_index (sm->per_thread_data, m->workers[0]);
       else
        tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
 
-      init_nat_k (&kv, m->local_addr, m->local_port, fib_index, m->proto);
-      if (!out2in_only)
-       clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 0);
+      nat_ed_static_mapping_del_sessions (
+       sm, tsm, m->local_addr, m->local_port, m->proto, fib_index,
+       is_sm_addr_only (flags), e_addr, e_port);
+    }
 
-      /* Delete session(s) for static mapping if exist */
-      if (!(sm->static_mapping_only) ||
-         (sm->static_mapping_only && sm->static_mapping_connection_tracking))
-       {
-         nat_ed_static_mapping_del_sessions (
-           sm, tsm, m->local_addr, m->local_port, m->proto, fib_index,
-           addr_only, e_addr, e_port);
-       }
+  fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, sm->fib_src_low);
 
-      fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, sm->fib_src_low);
-      if (pool_elts (m->locals))
-       return 0;
+  if (pool_elts (m->locals))
+    return 0;
 
-      init_nat_k (&kv, m->external_addr, m->external_port, 0, m->proto);
-      clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 0);
+  // fib_index 0
+  init_nat_k (&kv, e_addr, e_port, 0, proto);
+  clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 0);
 
-      vec_free (m->tag);
-      vec_free (m->workers);
-      /* Delete static mapping from pool */
-      pool_put (sm->static_mappings, m);
-    }
+  vec_free (m->tag);
+  vec_free (m->workers);
+  pool_put (sm->static_mappings, m);
 
-  if (!addr_only || (l_addr.as_u32 == e_addr.as_u32))
+  if (is_sm_identity_nat (flags) || !is_sm_addr_only (flags))
     return 0;
 
-  /* Add/delete external address to FIB */
   pool_foreach (interface, sm->interfaces)
-   {
-     if (nat_interface_is_inside (interface))
-       continue;
+    {
+      if (nat_interface_is_inside (interface))
+       continue;
+
+      snat_add_del_addr_to_fib (&e_addr, 32, interface->sw_if_index, 0);
+      break;
+    }
 
-     snat_add_del_addr_to_fib (&e_addr, 32, interface->sw_if_index, is_add);
-     break;
-  }
   pool_foreach (interface, sm->output_feature_interfaces)
-   {
-     if (nat_interface_is_inside (interface))
-       continue;
+    {
+      if (nat_interface_is_inside (interface))
+       continue;
 
-     snat_add_del_addr_to_fib (&e_addr, 32, interface->sw_if_index, is_add);
-     break;
-  }
+      snat_add_del_addr_to_fib (&e_addr, 32, interface->sw_if_index, 0);
+      break;
+    }
 
   return 0;
 }
 
 int
-nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
-                                nat_protocol_t proto,
-                                nat44_lb_addr_port_t * locals, u8 is_add,
-                                twice_nat_type_t twice_nat, u8 out2in_only,
-                                u8 * tag, u32 affinity)
+nat44_ed_add_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
+                               nat_protocol_t proto,
+                               nat44_lb_addr_port_t *locals, u32 flags,
+                               u8 *tag, u32 affinity)
 {
   snat_main_t *sm = &snat_main;
   snat_static_mapping_t *m;
   clib_bihash_kv_8_8_t kv, value;
   snat_address_t *a = 0;
-  int i;
+
   nat44_lb_addr_port_t *local;
-  snat_main_per_thread_data_t *tsm;
-  snat_session_t *s;
   uword *bitmap = 0;
 
+  int i;
+
   init_nat_k (&kv, e_addr, e_port, 0, proto);
   if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
     m = 0;
   else
     m = pool_elt_at_index (sm->static_mappings, value.value);
 
-  if (is_add)
-    {
-      if (m)
-       return VNET_API_ERROR_VALUE_EXIST;
+  if (m)
+    return VNET_API_ERROR_VALUE_EXIST;
 
-      if (vec_len (locals) < 2)
-       return VNET_API_ERROR_INVALID_VALUE;
+  if (vec_len (locals) < 2)
+    return VNET_API_ERROR_INVALID_VALUE;
 
-      /* Find external address in allocated addresses and reserve port for
-         address and port pair mapping when dynamic translations enabled */
-      if (!(sm->static_mapping_only || out2in_only))
+  /* Find external address in allocated addresses and reserve port for
+     address and port pair mapping when dynamic translations enabled */
+  if (!(sm->static_mapping_only || is_sm_out2in_only (flags)))
+    {
+      for (i = 0; i < vec_len (sm->addresses); i++)
        {
-         for (i = 0; i < vec_len (sm->addresses); i++)
+         if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
            {
-             if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
+             a = sm->addresses + i;
+             /* External port must be unused */
+             switch (proto)
                {
-                 a = sm->addresses + i;
-                 /* External port must be unused */
-                 switch (proto)
-                   {
-#define _(N, j, n, s) \
-                    case NAT_PROTOCOL_##N: \
-                      if (a->busy_##n##_port_refcounts[e_port]) \
-                        return VNET_API_ERROR_INVALID_VALUE; \
-                      ++a->busy_##n##_port_refcounts[e_port]; \
-                      if (e_port > 1024) \
-                        { \
-                          a->busy_##n##_ports++; \
-                          a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]++; \
-                        } \
-                      break;
-                     foreach_nat_protocol
+#define _(N, j, n, s)                                                         \
+  case NAT_PROTOCOL_##N:                                                      \
+    if (a->busy_##n##_port_refcounts[e_port])                                 \
+      return VNET_API_ERROR_INVALID_VALUE;                                    \
+    ++a->busy_##n##_port_refcounts[e_port];                                   \
+    if (e_port > 1024)                                                        \
+      {                                                                       \
+       a->busy_##n##_ports++;                                                \
+       a->busy_##n##_ports_per_thread[get_thread_idx_by_port (e_port)]++;    \
+      }                                                                       \
+    break;
+                 foreach_nat_protocol
 #undef _
-                       default : nat_elog_info (sm, "unknown protocol");
-                     return VNET_API_ERROR_INVALID_VALUE_2;
-                   }
-                 break;
+                   default : nat_elog_info (sm, "unknown protocol");
+                 return VNET_API_ERROR_INVALID_VALUE_2;
                }
+             break;
            }
-         /* External address must be allocated */
-         if (!a)
-           return VNET_API_ERROR_NO_SUCH_ENTRY;
        }
+      /* External address must be allocated */
+      if (!a)
+       return VNET_API_ERROR_NO_SUCH_ENTRY;
+    }
 
-      pool_get (sm->static_mappings, m);
-      clib_memset (m, 0, sizeof (*m));
-      m->tag = vec_dup (tag);
-      m->external_addr = e_addr;
-      m->external_port = e_port;
-      m->proto = proto;
-      m->twice_nat = twice_nat;
-      m->flags |= NAT_STATIC_MAPPING_FLAG_LB;
-      if (out2in_only)
-       m->flags |= NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY;
-      m->affinity = affinity;
-
-      if (affinity)
-       m->affinity_per_service_list_head_index =
-         nat_affinity_get_per_service_list_head_index ();
-      else
-       m->affinity_per_service_list_head_index = ~0;
+  pool_get (sm->static_mappings, m);
+  clib_memset (m, 0, sizeof (*m));
+  m->tag = vec_dup (tag);
+  m->external_addr = e_addr;
+  m->external_port = e_port;
+  m->affinity = affinity;
+  m->proto = proto;
 
-      init_nat_kv (&kv, m->external_addr, m->external_port, 0, m->proto, 0,
-                  m - sm->static_mappings);
-      if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 1))
+  m->flags = flags;
+  m->flags |= NAT_SM_FLAG_LB;
+
+  if (affinity)
+    m->affinity_per_service_list_head_index =
+      nat_affinity_get_per_service_list_head_index ();
+  else
+    m->affinity_per_service_list_head_index = ~0;
+
+  init_nat_kv (&kv, m->external_addr, m->external_port, 0, m->proto, 0,
+              m - sm->static_mappings);
+  if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 1))
+    {
+      nat_elog_err (sm, "static_mapping_by_external key add failed");
+      return VNET_API_ERROR_UNSPECIFIED;
+    }
+
+  for (i = 0; i < vec_len (locals); i++)
+    {
+      locals[i].fib_index = fib_table_find_or_create_and_lock (
+       FIB_PROTOCOL_IP4, locals[i].vrf_id, sm->fib_src_low);
+      if (!is_sm_out2in_only (flags))
        {
-         nat_elog_err (sm, "static_mapping_by_external key add failed");
-         return VNET_API_ERROR_UNSPECIFIED;
+         init_nat_kv (&kv, locals[i].addr, locals[i].port,
+                      locals[i].fib_index, m->proto, 0,
+                      m - sm->static_mappings);
+         clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1);
        }
-
-      for (i = 0; i < vec_len (locals); i++)
+      locals[i].prefix = (i == 0) ?
+                          locals[i].probability :
+                          (locals[i - 1].prefix + locals[i].probability);
+      pool_get (m->locals, local);
+      *local = locals[i];
+      if (sm->num_workers > 1)
        {
-         locals[i].fib_index =
-           fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4,
-                                              locals[i].vrf_id,
-                                              sm->fib_src_low);
-         if (!out2in_only)
-           {
-             init_nat_kv (&kv, locals[i].addr, locals[i].port,
-                          locals[i].fib_index, m->proto, 0,
-                          m - sm->static_mappings);
-             clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1);
-           }
-         locals[i].prefix = (i == 0) ? locals[i].probability :
-           (locals[i - 1].prefix + locals[i].probability);
-         pool_get (m->locals, local);
-         *local = locals[i];
-         if (sm->num_workers > 1)
-           {
-             ip4_header_t ip = {
-               .src_address = locals[i].addr,
-             };
-             bitmap = clib_bitmap_set (
-               bitmap,
-               nat44_ed_get_in2out_worker_index (0, &ip, m->fib_index, 0), 1);
-           }
+         ip4_header_t ip = {
+           .src_address = locals[i].addr,
+         };
+         bitmap = clib_bitmap_set (
+           bitmap, nat44_ed_get_in2out_worker_index (0, &ip, m->fib_index, 0),
+           1);
        }
+    }
 
-      /* Assign workers */
-      if (sm->num_workers > 1)
+  /* Assign workers */
+  if (sm->num_workers > 1)
+    {
+      clib_bitmap_foreach (i, bitmap)
        {
-          clib_bitmap_foreach (i, bitmap)
-             {
-               vec_add1(m->workers, i);
-            }
+         vec_add1 (m->workers, i);
        }
     }
+
+  return 0;
+}
+
+int
+nat44_ed_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
+                               nat_protocol_t proto, u32 flags)
+{
+  snat_main_t *sm = &snat_main;
+  snat_static_mapping_t *m;
+  clib_bihash_kv_8_8_t kv, value;
+  snat_address_t *a = 0;
+
+  nat44_lb_addr_port_t *local;
+  snat_main_per_thread_data_t *tsm;
+  snat_session_t *s;
+  int i;
+
+  init_nat_k (&kv, e_addr, e_port, 0, proto);
+  if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
+    m = 0;
   else
-    {
-      if (!m)
-       return VNET_API_ERROR_NO_SUCH_ENTRY;
+    m = pool_elt_at_index (sm->static_mappings, value.value);
 
-      if (!is_lb_static_mapping (m))
-       return VNET_API_ERROR_INVALID_VALUE;
+  if (!m)
+    return VNET_API_ERROR_NO_SUCH_ENTRY;
+
+  if (!is_sm_lb (m->flags))
+    return VNET_API_ERROR_INVALID_VALUE;
 
-      /* Free external address port */
-      if (!(sm->static_mapping_only || out2in_only))
+  /* Free external address port */
+  if (!(sm->static_mapping_only || is_sm_out2in_only (flags)))
+    {
+      for (i = 0; i < vec_len (sm->addresses); i++)
        {
-         for (i = 0; i < vec_len (sm->addresses); i++)
+         if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
            {
-             if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
+             a = sm->addresses + i;
+             switch (proto)
                {
-                 a = sm->addresses + i;
-                 switch (proto)
-                   {
-#define _(N, j, n, s) \
-                    case NAT_PROTOCOL_##N: \
-                      --a->busy_##n##_port_refcounts[e_port]; \
-                      if (e_port > 1024) \
-                        { \
-                          a->busy_##n##_ports--; \
-                          a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]--; \
-                        } \
-                      break;
-                     foreach_nat_protocol
+#define _(N, j, n, s)                                                         \
+  case NAT_PROTOCOL_##N:                                                      \
+    --a->busy_##n##_port_refcounts[e_port];                                   \
+    if (e_port > 1024)                                                        \
+      {                                                                       \
+       a->busy_##n##_ports--;                                                \
+       a->busy_##n##_ports_per_thread[get_thread_idx_by_port (e_port)]--;    \
+      }                                                                       \
+    break;
+                 foreach_nat_protocol
 #undef _
-                       default : nat_elog_info (sm, "unknown protocol");
-                     return VNET_API_ERROR_INVALID_VALUE_2;
-                   }
-                 break;
+                   default : nat_elog_info (sm, "unknown protocol");
+                 return VNET_API_ERROR_INVALID_VALUE_2;
                }
+             break;
            }
        }
+    }
 
-      init_nat_k (&kv, m->external_addr, m->external_port, 0, m->proto);
-      if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 0))
-       {
-         nat_elog_err (sm, "static_mapping_by_external key del failed");
-         return VNET_API_ERROR_UNSPECIFIED;
-       }
-
-      pool_foreach (local, m->locals)
-      {
-          fib_table_unlock (local->fib_index, FIB_PROTOCOL_IP4,
-                            sm->fib_src_low);
-          if (!out2in_only)
-            {
-             init_nat_k (&kv, local->addr, local->port, local->fib_index,
-                         m->proto);
-             if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv,
-                                          0))
-               {
-                 nat_elog_err (sm, "static_mapping_by_local key del failed");
-                 return VNET_API_ERROR_UNSPECIFIED;
-               }
-           }
+  init_nat_k (&kv, m->external_addr, m->external_port, 0, m->proto);
+  if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 0))
+    {
+      nat_elog_err (sm, "static_mapping_by_external key del failed");
+      return VNET_API_ERROR_UNSPECIFIED;
+    }
 
-         if (sm->num_workers > 1)
+  pool_foreach (local, m->locals)
+    {
+      fib_table_unlock (local->fib_index, FIB_PROTOCOL_IP4, sm->fib_src_low);
+      if (!is_sm_out2in_only (flags))
+       {
+         init_nat_k (&kv, local->addr, local->port, local->fib_index,
+                     m->proto);
+         if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 0))
            {
-             ip4_header_t ip = {
-               .src_address = local->addr,
-             };
-             tsm = vec_elt_at_index (
-               sm->per_thread_data,
-               nat44_ed_get_in2out_worker_index (0, &ip, m->fib_index, 0));
+             nat_elog_err (sm, "static_mapping_by_local key del failed");
+             return VNET_API_ERROR_UNSPECIFIED;
            }
-         else
-           tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
+       }
 
-         /* Delete sessions */
-         pool_foreach (s, tsm->sessions)
-           {
-             if (!(is_lb_session (s)))
-               continue;
+      if (sm->num_workers > 1)
+       {
+         ip4_header_t ip = {
+           .src_address = local->addr,
+         };
+         tsm = vec_elt_at_index (
+           sm->per_thread_data,
+           nat44_ed_get_in2out_worker_index (0, &ip, m->fib_index, 0));
+       }
+      else
+       tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
 
-             if ((s->in2out.addr.as_u32 != local->addr.as_u32) ||
-                 s->in2out.port != local->port)
-               continue;
+      /* Delete sessions */
+      pool_foreach (s, tsm->sessions)
+       {
+         if (!(is_lb_session (s)))
+           continue;
 
-             nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0);
-             nat_ed_session_delete (sm, s, tsm - sm->per_thread_data, 1);
-           }
-      }
-      if (m->affinity)
-       nat_affinity_flush_service (m->affinity_per_service_list_head_index);
-      pool_free (m->locals);
-      vec_free (m->tag);
-      vec_free (m->workers);
+         if ((s->in2out.addr.as_u32 != local->addr.as_u32) ||
+             s->in2out.port != local->port)
+           continue;
 
-      pool_put (sm->static_mappings, m);
+         nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0);
+         nat_ed_session_delete (sm, s, tsm - sm->per_thread_data, 1);
+       }
+    }
+
+  if (m->affinity)
+    {
+      nat_affinity_flush_service (m->affinity_per_service_list_head_index);
     }
 
+  pool_free (m->locals);
+  vec_free (m->tag);
+  vec_free (m->workers);
+  pool_put (sm->static_mappings, m);
+
   return 0;
 }
 
 int
-nat44_lb_static_mapping_add_del_local (ip4_address_t e_addr, u16 e_port,
-                                      ip4_address_t l_addr, u16 l_port,
-                                      nat_protocol_t proto, u32 vrf_id,
-                                      u8 probability, u8 is_add)
+nat44_ed_add_del_lb_static_mapping_local (ip4_address_t e_addr, u16 e_port,
+                                         ip4_address_t l_addr, u16 l_port,
+                                         nat_protocol_t proto, u32 vrf_id,
+                                         u8 probability, u8 is_add)
 {
   snat_main_t *sm = &snat_main;
   snat_static_mapping_t *m = 0;
@@ -1103,7 +1279,7 @@ nat44_lb_static_mapping_add_del_local (ip4_address_t e_addr, u16 e_port,
   if (!m)
     return VNET_API_ERROR_NO_SUCH_ENTRY;
 
-  if (!is_lb_static_mapping (m))
+  if (!is_sm_lb (m->flags))
     return VNET_API_ERROR_INVALID_VALUE;
 
   pool_foreach (local, m->locals)
@@ -1131,7 +1307,7 @@ nat44_lb_static_mapping_add_del_local (ip4_address_t e_addr, u16 e_port,
        fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id,
                                           sm->fib_src_low);
 
-      if (!is_out2in_only_static_mapping (m))
+      if (!is_sm_out2in_only (m->flags))
        {
          init_nat_kv (&kv, l_addr, l_port, local->fib_index, proto, 0,
                       m - sm->static_mappings);
@@ -1150,7 +1326,7 @@ nat44_lb_static_mapping_add_del_local (ip4_address_t e_addr, u16 e_port,
       fib_table_unlock (match_local->fib_index, FIB_PROTOCOL_IP4,
                        sm->fib_src_low);
 
-      if (!is_out2in_only_static_mapping (m))
+      if (!is_sm_out2in_only (m->flags))
        {
          init_nat_k (&kv, l_addr, l_port, match_local->fib_index, proto);
          if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 0))
@@ -1251,20 +1427,14 @@ snat_del_address (snat_main_t * sm, ip4_address_t addr, u8 delete_sm,
 
   if (delete_sm)
     {
-      ip4_address_t pool_addr = { 0 };
       pool_foreach (m, sm->static_mappings)
        {
           if (m->external_addr.as_u32 == addr.as_u32)
-            (void) snat_add_static_mapping (m->local_addr, m->external_addr,
-                                            m->local_port, m->external_port,
-                                            m->vrf_id,
-                                            is_addr_only_static_mapping(m), ~0,
-                                            m->proto, 0 /* is_add */,
-                                            m->twice_nat,
-                                            is_out2in_only_static_mapping(m),
-                                            m->tag,
-                                            is_identity_static_mapping(m),
-                                            pool_addr, 0);
+           {
+             nat44_ed_del_static_mapping (m->local_addr, m->external_addr,
+                                          m->local_port, m->external_port,
+                                          m->proto, m->vrf_id, ~0, m->flags);
+           }
       }
     }
   else
@@ -1526,7 +1696,7 @@ nat44_ed_add_interface (u32 sw_if_index, u8 is_inside)
        }
       pool_foreach (m, sm->static_mappings)
        {
-         if (!(is_addr_only_static_mapping (m)) ||
+         if (!(is_sm_addr_only (m->flags)) ||
              (m->local_addr.as_u32 == m->external_addr.as_u32))
            {
              continue;
@@ -1649,7 +1819,7 @@ nat44_ed_del_interface (u32 sw_if_index, u8 is_inside)
 
       pool_foreach (m, sm->static_mappings)
        {
-         if (!(is_addr_only_static_mapping (m)) ||
+         if (!(is_sm_addr_only (m->flags)) ||
              (m->local_addr.as_u32 == m->external_addr.as_u32))
            {
              continue;
@@ -1762,7 +1932,7 @@ nat44_ed_add_output_interface (u32 sw_if_index)
 
   pool_foreach (m, sm->static_mappings)
     {
-      if (!((is_addr_only_static_mapping (m))) ||
+      if (!((is_sm_addr_only (m->flags))) ||
          (m->local_addr.as_u32 == m->external_addr.as_u32))
        {
          continue;
@@ -1862,7 +2032,7 @@ nat44_ed_del_output_interface (u32 sw_if_index)
 
   pool_foreach (m, sm->static_mappings)
     {
-      if (!((is_addr_only_static_mapping (m))) ||
+      if (!((is_sm_addr_only (m->flags))) ||
          (m->local_addr.as_u32 == m->external_addr.as_u32))
        {
          continue;
@@ -2530,7 +2700,7 @@ snat_static_mapping_match (vlib_main_t *vm, snat_main_t *sm,
 
   if (by_external)
     {
-      if (is_lb_static_mapping (m))
+      if (is_sm_lb (m->flags))
        {
          if (PREDICT_FALSE (lb != 0))
            *lb = m->affinity ? AFFINITY_LB_NAT : LB_NAT;
@@ -2603,28 +2773,39 @@ snat_static_mapping_match (vlib_main_t *vm, snat_main_t *sm,
          *mapping_fib_index = m->fib_index;
          *mapping_addr = m->local_addr;
          /* Address only mapping doesn't change port */
-         *mapping_port = is_addr_only_static_mapping (m) ? match_port
-           : m->local_port;
+         *mapping_port =
+           is_sm_addr_only (m->flags) ? match_port : m->local_port;
        }
     }
   else
     {
       *mapping_addr = m->external_addr;
       /* Address only mapping doesn't change port */
-      *mapping_port = is_addr_only_static_mapping (m) ? match_port
-       : m->external_port;
+      *mapping_port =
+       is_sm_addr_only (m->flags) ? match_port : m->external_port;
       *mapping_fib_index = sm->outside_fib_index;
     }
 
 end:
   if (PREDICT_FALSE (is_addr_only != 0))
-    *is_addr_only = is_addr_only_static_mapping (m);
+    *is_addr_only = is_sm_addr_only (m->flags);
 
   if (PREDICT_FALSE (twice_nat != 0))
-    *twice_nat = m->twice_nat;
+    {
+      *twice_nat = TWICE_NAT_DISABLED;
+
+      if (is_sm_twice_nat (m->flags))
+       {
+         *twice_nat = TWICE_NAT;
+       }
+      else if (is_sm_self_twice_nat (m->flags))
+       {
+         *twice_nat = TWICE_NAT_SELF;
+       }
+    }
 
   if (PREDICT_FALSE (is_identity_nat != 0))
-    *is_identity_nat = is_identity_static_mapping (m);
+    *is_identity_nat = is_sm_identity_nat (m->flags);
 
   if (out != 0)
     *out = m;
@@ -2854,7 +3035,7 @@ nat44_ed_get_out2in_worker_index (vlib_buffer_t *b, ip4_header_t *ip,
          (&sm->static_mapping_by_external, &kv, &value))
        {
          m = pool_elt_at_index (sm->static_mappings, value.value);
-         if (!is_lb_static_mapping (m))
+         if (!is_sm_lb (m->flags))
            {
              next_worker_index = m->workers[0];
              goto done;
@@ -3071,8 +3252,8 @@ nat_ip4_add_del_addr_only_sm_cb (ip4_main_t * im,
   snat_static_map_resolve_t *rp;
   snat_static_mapping_t *m;
   clib_bihash_kv_8_8_t kv, value;
-  int i, rv;
   ip4_address_t l_addr;
+  int i, rv;
 
   if (!sm->enabled)
     return;
@@ -3113,18 +3294,23 @@ match:
     l_addr.as_u32 = address[0].as_u32;
   else
     l_addr.as_u32 = rp->l_addr.as_u32;
-  /* Add the static mapping */
-  rv = snat_add_static_mapping (l_addr,
-                               address[0],
-                               rp->l_port,
-                               rp->e_port,
-                               rp->vrf_id,
-                               rp->addr_only, ~0 /* sw_if_index */ ,
-                               rp->proto, !is_delete, rp->twice_nat,
-                               rp->out2in_only, rp->tag, rp->identity_nat,
-                               rp->pool_addr, rp->exact);
+
+  if (is_delete)
+    {
+      rv = nat44_ed_del_static_mapping (l_addr, address[0], rp->l_port,
+                                       rp->e_port, rp->proto, rp->vrf_id, ~0,
+                                       rp->flags);
+    }
+  else
+    {
+      rv = nat44_ed_add_static_mapping (l_addr, address[0], rp->l_port,
+                                       rp->e_port, rp->proto, rp->vrf_id, ~0,
+                                       rp->flags, rp->pool_addr, rp->tag);
+    }
   if (rv)
-    nat_elog_notice_X1 (sm, "snat_add_static_mapping returned %d", "i4", rv);
+    {
+      nat_elog_notice_X1 (sm, "add_static_mapping returned %d", "i4", rv);
+    }
 }
 
 static void
@@ -3180,20 +3366,23 @@ match:
          /* On this interface? */
          if (rp->sw_if_index == sw_if_index)
            {
+
+             // TODO: remove if not needed (handled by function)
              /* Indetity mapping? */
              if (rp->l_addr.as_u32 == 0)
                l_addr.as_u32 = address[0].as_u32;
              else
                l_addr.as_u32 = rp->l_addr.as_u32;
+
              /* Add the static mapping */
-             rv = snat_add_static_mapping (
-               l_addr, address[0], rp->l_port, rp->e_port, rp->vrf_id,
-               rp->addr_only, ~0 /* sw_if_index */, rp->proto, 1,
-               rp->twice_nat, rp->out2in_only, rp->tag, rp->identity_nat,
-               rp->pool_addr, rp->exact);
+             rv = nat44_ed_add_static_mapping (
+               l_addr, address[0], rp->l_port, rp->e_port, rp->proto,
+               rp->vrf_id, ~0, rp->flags, rp->pool_addr, rp->tag);
              if (rv)
-               nat_elog_notice_X1 (sm, "snat_add_static_mapping returned %d",
-                                   "i4", rv);
+               {
+                 nat_elog_notice_X1 (sm, "add_static_mapping returned %d",
+                                     "i4", rv);
+               }
            }
        }
       return;