nat: more long read after short write optimization
[vpp.git] / src / plugins / nat / out2in_ed.c
index 1382125..3d081e1 100644 (file)
@@ -31,6 +31,7 @@
 #include <nat/nat44/inlines.h>
 #include <nat/nat_syslog.h>
 #include <nat/nat_ha.h>
+#include <nat/nat44/ed_inlines.h>
 
 static char *nat_out2in_ed_error_strings[] = {
 #define _(sym,string) string,
@@ -71,6 +72,8 @@ icmp_out2in_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
                          vlib_node_runtime_t * node, u32 next0, f64 now,
                          u32 thread_index, snat_session_t ** p_s0)
 {
+  vlib_main_t *vm = vlib_get_main ();
+
   next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
                       next0, thread_index, p_s0, 0);
   snat_session_t *s0 = *p_s0;
@@ -79,7 +82,7 @@ icmp_out2in_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0,
       /* Accounting */
       nat44_session_update_counters (s0, now,
                                     vlib_buffer_length_in_chain
-                                    (sm->vlib_main, b0), thread_index);
+                                    (vm, b0), thread_index);
       /* Per-user LRU list maintenance */
       nat44_session_update_lru (sm, s0, thread_index);
     }
@@ -100,8 +103,7 @@ nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
   u32 fib_index;
   clib_bihash_kv_16_8_t ed_kv;
   int i;
-  snat_address_t *a;
-  snat_session_key_t key;
+  //snat_address_t *a;
   snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
                                                       ctx->thread_index);
 
@@ -120,7 +122,7 @@ nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
        }
       else
        {
-         proto = snat_proto_to_ip_proto (s->in2out.protocol);
+         proto = nat_proto_to_ip_proto (s->nat_proto);
          l_port = s->in2out.port;
          r_port = s->ext_host_port;
        }
@@ -129,8 +131,7 @@ nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
          r_addr = &s->ext_host_nat_addr;
          r_port = s->ext_host_nat_port;
        }
-      make_ed_kv (l_addr, r_addr, proto, fib_index, l_port, r_port, ~0ULL,
-                 &ed_kv);
+      init_ed_k (&ed_kv, *l_addr, l_port, *r_addr, r_port, fib_index, proto);
       if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &ed_kv, 0))
        nat_elog_warn ("in2out_ed key del failed");
 
@@ -140,7 +141,7 @@ nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
       snat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
                                           s->in2out.addr.as_u32,
                                           s->out2in.addr.as_u32,
-                                          s->in2out.protocol,
+                                          s->nat_proto,
                                           s->in2out.port,
                                           s->out2in.port,
                                           s->in2out.fib_index);
@@ -150,26 +151,27 @@ nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
                             &s->ext_host_nat_addr, s->ext_host_nat_port,
                             &s->out2in.addr, s->out2in.port,
                             &s->ext_host_addr, s->ext_host_port,
-                            s->in2out.protocol, is_twice_nat_session (s));
+                            s->nat_proto, is_twice_nat_session (s));
 
       nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
-                  s->ext_host_port, s->out2in.protocol, s->out2in.fib_index,
+                  s->ext_host_port, s->nat_proto, s->out2in.fib_index,
                   ctx->thread_index);
 
       if (is_twice_nat_session (s))
        {
          for (i = 0; i < vec_len (sm->twice_nat_addresses); i++)
            {
-             key.protocol = s->in2out.protocol;
-             key.port = s->ext_host_nat_port;
-             a = sm->twice_nat_addresses + i;
-             if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
-               {
-                 snat_free_outside_address_and_port (sm->twice_nat_addresses,
-                                                     ctx->thread_index,
-                                                     &key);
-                 break;
-               }
+             // FIXME TODO this is obviously wrong code ... needs fix!
+             //       key.protocol = s->nat_proto;
+             //       key.port = s->ext_host_nat_port;
+             //       a = sm->twice_nat_addresses + i;
+             //       if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32)
+             //      {
+             //        snat_free_outside_address_and_port (sm->twice_nat_addresses,
+             //                                            ctx->thread_index,
+             //                                            &key);
+             //        break;
+             //      }
            }
        }
 
@@ -177,9 +179,10 @@ nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
        goto delete;
 
       snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
-                                         &s->out2in);
+                                         &s->out2in.addr, s->out2in.port,
+                                         s->nat_proto);
     delete:
-      nat44_ed_delete_session (sm, s, ctx->thread_index, 1);
+      nat_ed_session_delete (sm, s, ctx->thread_index, 1);
       return 1;
     }
 
@@ -190,9 +193,15 @@ nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg)
 static snat_session_t *
 create_session_for_static_mapping_ed (snat_main_t * sm,
                                      vlib_buffer_t * b,
-                                     snat_session_key_t l_key,
-                                     snat_session_key_t e_key,
+                                     ip4_address_t i2o_addr,
+                                     u16 i2o_port,
+                                     u32 i2o_fib_index,
+                                     ip4_address_t o2i_addr,
+                                     u16 o2i_port,
+                                     u32 o2i_fib_index,
+                                     nat_protocol_t nat_proto,
                                      vlib_node_runtime_t * node,
+                                     u32 rx_fib_index,
                                      u32 thread_index,
                                      twice_nat_type_t twice_nat,
                                      lb_nat_type_t lb_nat, f64 now)
@@ -202,17 +211,17 @@ create_session_for_static_mapping_ed (snat_main_t * sm,
   udp_header_t *udp;
   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
   clib_bihash_kv_16_8_t kv;
-  snat_session_key_t eh_key;
   nat44_is_idle_session_ctx_t ctx;
 
-  if (PREDICT_FALSE (nat44_maximum_sessions_exceeded (sm, thread_index)))
+  if (PREDICT_FALSE
+      (nat44_ed_maximum_sessions_exceeded (sm, rx_fib_index, thread_index)))
     {
       b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED];
       nat_elog_notice ("maximum sessions exceeded");
       return 0;
     }
 
-  s = nat_ed_session_alloc (sm, thread_index, now);
+  s = nat_ed_session_alloc (sm, thread_index, now, nat_proto);
   if (!s)
     {
       b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_USER_SESS_EXCEEDED];
@@ -224,55 +233,58 @@ create_session_for_static_mapping_ed (snat_main_t * sm,
   udp = ip4_next_header (ip);
 
   s->ext_host_addr.as_u32 = ip->src_address.as_u32;
-  s->ext_host_port = e_key.protocol == SNAT_PROTOCOL_ICMP ? 0 : udp->src_port;
+  s->ext_host_port = nat_proto == NAT_PROTOCOL_ICMP ? 0 : udp->src_port;
   s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
   if (lb_nat)
     s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING;
   if (lb_nat == AFFINITY_LB_NAT)
     s->flags |= SNAT_SESSION_FLAG_AFFINITY;
   s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT;
-  s->out2in = e_key;
-  s->in2out = l_key;
-  s->in2out.protocol = s->out2in.protocol;
+  s->out2in.addr = o2i_addr;
+  s->out2in.port = o2i_port;
+  s->out2in.fib_index = o2i_fib_index;
+  s->in2out.addr = i2o_addr;
+  s->in2out.port = i2o_port;
+  s->in2out.fib_index = i2o_fib_index;
+  s->nat_proto = nat_proto;
 
   /* Add to lookup tables */
-  make_ed_kv (&e_key.addr, &s->ext_host_addr, ip->protocol,
-             e_key.fib_index, e_key.port, s->ext_host_port,
-             s - tsm->sessions, &kv);
+  init_ed_kv (&kv, o2i_addr, o2i_port, s->ext_host_addr, s->ext_host_port,
+             o2i_fib_index, ip->protocol, thread_index, s - tsm->sessions);
   ctx.now = now;
   ctx.thread_index = thread_index;
-  if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, &kv,
+  if (clib_bihash_add_or_overwrite_stale_16_8 (&sm->out2in_ed, &kv,
                                               nat44_o2i_ed_is_idle_session_cb,
                                               &ctx))
     nat_elog_notice ("out2in-ed key add failed");
 
   if (twice_nat == TWICE_NAT || (twice_nat == TWICE_NAT_SELF &&
-                                ip->src_address.as_u32 == l_key.addr.as_u32))
+                                ip->src_address.as_u32 == i2o_addr.as_u32))
     {
-      eh_key.protocol = e_key.protocol;
       if (snat_alloc_outside_address_and_port (sm->twice_nat_addresses, 0,
-                                              thread_index, &eh_key,
+                                              thread_index,
+                                              nat_proto,
+                                              &s->ext_host_nat_addr,
+                                              &s->ext_host_nat_port,
                                               sm->port_per_thread,
                                               tsm->snat_thread_index))
        {
          b->error = node->errors[NAT_OUT2IN_ED_ERROR_OUT_OF_PORTS];
-         nat44_ed_delete_session (sm, s, thread_index, 1);
-         if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &kv, 0))
+         nat_ed_session_delete (sm, s, thread_index, 1);
+         if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &kv, 0))
            nat_elog_notice ("out2in-ed key del failed");
          return 0;
        }
-      s->ext_host_nat_addr.as_u32 = eh_key.addr.as_u32;
-      s->ext_host_nat_port = eh_key.port;
       s->flags |= SNAT_SESSION_FLAG_TWICE_NAT;
-      make_ed_kv (&l_key.addr, &s->ext_host_nat_addr, ip->protocol,
-                 l_key.fib_index, l_key.port, s->ext_host_nat_port,
-                 s - tsm->sessions, &kv);
+      init_ed_kv (&kv, i2o_addr, i2o_port, s->ext_host_nat_addr,
+                 s->ext_host_nat_port, i2o_fib_index, ip->protocol,
+                 thread_index, s - tsm->sessions);
     }
   else
     {
-      make_ed_kv (&l_key.addr, &s->ext_host_addr, ip->protocol,
-                 l_key.fib_index, l_key.port, s->ext_host_port,
-                 s - tsm->sessions, &kv);
+      init_ed_kv (&kv, i2o_addr, i2o_port, s->ext_host_addr,
+                 s->ext_host_port, i2o_fib_index, ip->protocol,
+                 thread_index, s - tsm->sessions);
     }
   if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, &kv,
                                               nat44_i2o_ed_is_idle_session_cb,
@@ -282,7 +294,7 @@ create_session_for_static_mapping_ed (snat_main_t * sm,
   snat_ipfix_logging_nat44_ses_create (thread_index,
                                       s->in2out.addr.as_u32,
                                       s->out2in.addr.as_u32,
-                                      s->in2out.protocol,
+                                      s->nat_proto,
                                       s->in2out.port,
                                       s->out2in.port, s->in2out.fib_index);
 
@@ -291,13 +303,12 @@ create_session_for_static_mapping_ed (snat_main_t * sm,
                         &s->ext_host_nat_addr, s->ext_host_nat_port,
                         &s->out2in.addr, s->out2in.port,
                         &s->ext_host_addr, s->ext_host_port,
-                        s->in2out.protocol, is_twice_nat_session (s));
+                        s->nat_proto, is_twice_nat_session (s));
 
   nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
               s->out2in.port, &s->ext_host_addr, s->ext_host_port,
               &s->ext_host_nat_addr, s->ext_host_nat_port,
-              s->in2out.protocol, s->in2out.fib_index, s->flags,
-              thread_index, 0);
+              s->nat_proto, s->in2out.fib_index, s->flags, thread_index, 0);
 
   return s;
 }
@@ -309,8 +320,8 @@ next_src_nat (snat_main_t * sm, ip4_header_t * ip, u16 src_port,
   clib_bihash_kv_16_8_t kv, value;
   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 
-  make_ed_kv (&ip->src_address, &ip->dst_address, ip->protocol,
-             rx_fib_index, src_port, dst_port, ~0ULL, &kv);
+  init_ed_k (&kv, ip->src_address, src_port, ip->dst_address, dst_port,
+            rx_fib_index, ip->protocol);
   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
     return 1;
 
@@ -325,13 +336,14 @@ create_bypass_for_fwd (snat_main_t * sm, vlib_buffer_t * b, ip4_header_t * ip,
   udp_header_t *udp;
   snat_session_t *s = 0;
   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
-  f64 now = vlib_time_now (sm->vlib_main);
+  vlib_main_t *vm = vlib_get_main ();
+  f64 now = vlib_time_now (vm);
   u16 l_port, r_port;
 
   if (ip->protocol == IP_PROTOCOL_ICMP)
     {
       if (get_icmp_o2i_ed_key
-         (b, ip, rx_fib_index, ~0ULL, 0, &l_port, &r_port, &kv))
+         (b, ip, rx_fib_index, ~0, ~0, 0, &l_port, &r_port, &kv))
        return;
     }
   else
@@ -347,43 +359,50 @@ create_bypass_for_fwd (snat_main_t * sm, vlib_buffer_t * b, ip4_header_t * ip,
          l_port = 0;
          r_port = 0;
        }
-      make_ed_kv (&ip->dst_address, &ip->src_address, ip->protocol,
-                 rx_fib_index, l_port, r_port, ~0ULL, &kv);
+      init_ed_k (&kv, ip->dst_address, l_port, ip->src_address, r_port,
+                rx_fib_index, ip->protocol);
     }
 
   if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value))
     {
-      s = pool_elt_at_index (tsm->sessions, value.value);
+      ASSERT (thread_index == ed_value_get_thread_index (&value));
+      s =
+       pool_elt_at_index (tsm->sessions,
+                          ed_value_get_session_index (&value));
     }
   else
     {
       u32 proto;
 
-      if (PREDICT_FALSE (nat44_maximum_sessions_exceeded (sm, thread_index)))
+      if (PREDICT_FALSE
+         (nat44_ed_maximum_sessions_exceeded
+          (sm, rx_fib_index, thread_index)))
        return;
 
-      s = nat_ed_session_alloc (sm, thread_index, now);
+      s = nat_ed_session_alloc (sm, thread_index, now, ip->protocol);
       if (!s)
        {
          nat_elog_warn ("create NAT session failed");
          return;
        }
 
-      proto = ip_proto_to_snat_proto (ip->protocol);
+      proto = ip_proto_to_nat_proto (ip->protocol);
 
       s->ext_host_addr = ip->src_address;
       s->ext_host_port = r_port;
       s->flags |= SNAT_SESSION_FLAG_FWD_BYPASS;
       s->out2in.addr = ip->dst_address;
       s->out2in.port = l_port;
-      s->out2in.protocol = proto;
-      if (proto == ~0)
+      s->nat_proto = proto;
+      if (proto == NAT_PROTOCOL_OTHER)
        {
          s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO;
          s->out2in.port = ip->protocol;
        }
       s->out2in.fib_index = 0;
-      s->in2out = s->out2in;
+      s->in2out.addr = s->out2in.addr;
+      s->in2out.port = s->out2in.port;
+      s->in2out.fib_index = s->out2in.fib_index;
 
       kv.value = s - tsm->sessions;
       if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &kv, 1))
@@ -420,38 +439,41 @@ create_bypass_for_fwd_worker (snat_main_t * sm, vlib_buffer_t * b,
 #ifndef CLIB_MARCH_VARIANT
 u32
 icmp_match_out2in_ed (snat_main_t * sm, vlib_node_runtime_t * node,
-                     u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip,
-                     u8 * p_proto, snat_session_key_t * p_value,
-                     u8 * p_dont_translate, void *d, void *e)
+                     u32 thread_index, vlib_buffer_t * b,
+                     ip4_header_t * ip, ip4_address_t * addr,
+                     u16 * port, u32 * fib_index, nat_protocol_t * proto,
+                     void *d, void *e, u8 * dont_translate)
 {
   u32 next = ~0, sw_if_index, rx_fib_index;
   clib_bihash_kv_16_8_t kv, value;
   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
   snat_session_t *s = 0;
-  u8 dont_translate = 0, is_addr_only, identity_nat;
-  snat_session_key_t e_key, l_key;
+  u8 is_addr_only, identity_nat;
   u16 l_port, r_port;
+  vlib_main_t *vm = vlib_get_main ();
+  ip4_address_t sm_addr;
+  u16 sm_port;
+  u32 sm_fib_index;
+  *dont_translate = 0;
 
   sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
   rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
 
   if (get_icmp_o2i_ed_key
-      (b, ip, rx_fib_index, ~0ULL, p_proto, &l_port, &r_port, &kv))
+      (b, ip, rx_fib_index, ~0, ~0, proto, &l_port, &r_port, &kv))
     {
       b->error = node->errors[NAT_OUT2IN_ED_ERROR_UNSUPPORTED_PROTOCOL];
       next = NAT_NEXT_DROP;
       goto out;
     }
 
-  if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value))
+  if (clib_bihash_search_16_8 (&sm->out2in_ed, &kv, &value))
     {
       /* Try to match static mapping */
-      e_key.addr = ip->dst_address;
-      e_key.port = l_port;
-      e_key.protocol = ip_proto_to_snat_proto (ip->protocol);
-      e_key.fib_index = rx_fib_index;
       if (snat_static_mapping_match
-         (sm, e_key, &l_key, 1, &is_addr_only, 0, 0, 0, &identity_nat))
+         (sm, ip->dst_address, l_port, rx_fib_index,
+          ip_proto_to_nat_proto (ip->protocol), &sm_addr, &sm_port,
+          &sm_fib_index, 1, &is_addr_only, 0, 0, 0, &identity_nat))
        {
          if (!sm->forwarding_enabled)
            {
@@ -459,7 +481,7 @@ icmp_match_out2in_ed (snat_main_t * sm, vlib_node_runtime_t * node,
              if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index,
                                                    ip->dst_address.as_u32)))
                {
-                 dont_translate = 1;
+                 *dont_translate = 1;
                  goto out;
                }
              b->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION];
@@ -468,7 +490,7 @@ icmp_match_out2in_ed (snat_main_t * sm, vlib_node_runtime_t * node,
            }
          else
            {
-             dont_translate = 1;
+             *dont_translate = 1;
              if (next_src_nat (sm, ip, l_port, r_port,
                                thread_index, rx_fib_index))
                {
@@ -496,15 +518,18 @@ icmp_match_out2in_ed (snat_main_t * sm, vlib_node_runtime_t * node,
 
       if (PREDICT_FALSE (identity_nat))
        {
-         dont_translate = 1;
+         *dont_translate = 1;
          goto out;
        }
 
       /* Create session initiated by host from external network */
-      s = create_session_for_static_mapping_ed (sm, b, l_key, e_key, node,
-                                               thread_index, 0, 0,
-                                               vlib_time_now
-                                               (sm->vlib_main));
+      s =
+       create_session_for_static_mapping_ed (sm, b, sm_addr, sm_port,
+                                             sm_fib_index, ip->dst_address,
+                                             l_port, rx_fib_index, *proto,
+                                             node, rx_fib_index,
+                                             thread_index, 0, 0,
+                                             vlib_time_now (vm));
 
       if (!s)
        {
@@ -527,12 +552,18 @@ icmp_match_out2in_ed (snat_main_t * sm, vlib_node_runtime_t * node,
          goto out;
        }
 
-      s = pool_elt_at_index (tsm->sessions, value.value);
+      ASSERT (thread_index == ed_value_get_thread_index (&value));
+      s =
+       pool_elt_at_index (tsm->sessions,
+                          ed_value_get_session_index (&value));
     }
 out:
   if (s)
-    *p_value = s->in2out;
-  *p_dont_translate = dont_translate;
+    {
+      *addr = s->in2out.addr;
+      *port = s->in2out.port;
+      *fib_index = s->in2out.fib_index;
+    }
   if (d)
     *(snat_session_t **) d = s;
   return next;
@@ -558,24 +589,29 @@ nat44_ed_out2in_unknown_proto (snat_main_t * sm,
 
   old_addr = ip->dst_address.as_u32;
 
-  make_ed_kv (&ip->dst_address, &ip->src_address, ip->protocol, rx_fib_index,
-             0, 0, ~0ULL, &s_kv);
+  init_ed_k (&s_kv, ip->dst_address, 0, ip->src_address, 0, rx_fib_index,
+            ip->protocol);
 
-  if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
+  if (!clib_bihash_search_16_8 (&sm->out2in_ed, &s_kv, &s_value))
     {
-      s = pool_elt_at_index (tsm->sessions, s_value.value);
+      ASSERT (thread_index == ed_value_get_thread_index (&s_value));
+      s =
+       pool_elt_at_index (tsm->sessions,
+                          ed_value_get_session_index (&s_value));
       new_addr = ip->dst_address.as_u32 = s->in2out.addr.as_u32;
     }
   else
     {
-      if (PREDICT_FALSE (nat44_maximum_sessions_exceeded (sm, thread_index)))
+      if (PREDICT_FALSE
+         (nat44_ed_maximum_sessions_exceeded
+          (sm, rx_fib_index, thread_index)))
        {
          b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED];
          nat_elog_notice ("maximum sessions exceeded");
          return 0;
        }
 
-      make_sm_kv (&kv, &ip->dst_address, 0, 0, 0);
+      init_nat_k (&kv, ip->dst_address, 0, 0, 0);
       if (clib_bihash_search_8_8
          (&sm->static_mapping_by_external, &kv, &value))
        {
@@ -588,7 +624,7 @@ nat44_ed_out2in_unknown_proto (snat_main_t * sm,
       new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
 
       /* Create a new session */
-      s = nat_ed_session_alloc (sm, thread_index, now);
+      s = nat_ed_session_alloc (sm, thread_index, now, ip->protocol);
       if (!s)
        {
          b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_USER_SESS_EXCEEDED];
@@ -608,11 +644,11 @@ nat44_ed_out2in_unknown_proto (snat_main_t * sm,
 
       /* Add to lookup tables */
       s_kv.value = s - tsm->sessions;
-      if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1))
+      if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &s_kv, 1))
        nat_elog_notice ("out2in key add failed");
 
-      make_ed_kv (&ip->dst_address, &ip->src_address, ip->protocol,
-                 m->fib_index, 0, 0, s - tsm->sessions, &s_kv);
+      init_ed_kv (&s_kv, ip->dst_address, 0, ip->src_address, 0, m->fib_index,
+                 ip->protocol, thread_index, s - tsm->sessions);
       if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1))
        nat_elog_notice ("in2out key add failed");
     }
@@ -636,7 +672,8 @@ nat44_ed_out2in_unknown_proto (snat_main_t * sm,
 static inline uword
 nat44_ed_out2in_fast_path_node_fn_inline (vlib_main_t * vm,
                                          vlib_node_runtime_t * node,
-                                         vlib_frame_t * frame)
+                                         vlib_frame_t * frame,
+                                         int is_multi_worker)
 {
   u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index;
   nat_next_t next_index;
@@ -704,35 +741,64 @@ nat44_ed_out2in_fast_path_node_fn_inline (vlib_main_t * vm,
 
          udp0 = ip4_next_header (ip0);
          tcp0 = (tcp_header_t *) udp0;
-         proto0 = ip_proto_to_snat_proto (ip0->protocol);
+         proto0 = ip_proto_to_nat_proto (ip0->protocol);
 
-         if (PREDICT_FALSE (proto0 == ~0))
+         if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
            {
              next0 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
              goto trace0;
            }
 
-         if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+         if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
            {
              next0 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
              goto trace0;
            }
 
-         make_ed_kv (&ip0->dst_address, &ip0->src_address,
-                     ip0->protocol, rx_fib_index0,
-                     vnet_buffer (b0)->ip.reass.l4_dst_port,
-                     vnet_buffer (b0)->ip.reass.l4_src_port, ~0ULL, &kv0);
+         init_ed_k (&kv0, ip0->dst_address,
+                    vnet_buffer (b0)->ip.reass.l4_dst_port, ip0->src_address,
+                    vnet_buffer (b0)->ip.reass.l4_src_port, rx_fib_index0,
+                    ip0->protocol);
+
+         /* there is a stashed index in vnet_buffer2 from handoff node,
+          * see if we can use it */
+         if (is_multi_worker && PREDICT_TRUE
+             (!pool_is_free_index
+              (tsm->sessions,
+               vnet_buffer2 (b0)->nat.ed_out2in_nat_session_index)))
+           {
+             s0 = pool_elt_at_index (tsm->sessions,
+                                     vnet_buffer2 (b0)->
+                                     nat.ed_out2in_nat_session_index);
+             if (PREDICT_TRUE
+                 (s0->out2in.addr.as_u32 == ip0->dst_address.as_u32
+                  && s0->out2in.port ==
+                  vnet_buffer (b0)->ip.reass.l4_dst_port
+                  && s0->nat_proto == ip_proto_to_nat_proto (ip0->protocol)
+                  && s0->out2in.fib_index == rx_fib_index0
+                  && s0->ext_host_addr.as_u32 == ip0->src_address.as_u32
+                  && s0->ext_host_port ==
+                  vnet_buffer (b0)->ip.reass.l4_src_port))
+               {
+                 /* yes, this is the droid we're looking for */
+                 goto skip_lookup;
+               }
+           }
 
-         if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv0, &value0))
+         if (clib_bihash_search_16_8 (&sm->out2in_ed, &kv0, &value0))
            {
              next0 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
              goto trace0;
            }
-         s0 = pool_elt_at_index (tsm->sessions, value0.value);
+         ASSERT (thread_index == ed_value_get_thread_index (&value0));
+         s0 =
+           pool_elt_at_index (tsm->sessions,
+                              ed_value_get_session_index (&value0));
 
-         if (s0->tcp_close_timestamp)
+       skip_lookup:
+         if (s0->tcp_closed_timestamp)
            {
-             if (now >= s0->tcp_close_timestamp)
+             if (now >= s0->tcp_closed_timestamp)
                {
                  // session is closed, go slow path
                  next0 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
@@ -754,7 +820,7 @@ nat44_ed_out2in_fast_path_node_fn_inline (vlib_main_t * vm,
            {
              // session is closed, go slow path
              nat_free_session_data (sm, s0, thread_index, 0);
-             nat44_ed_delete_session (sm, s0, thread_index, 1);
+             nat_ed_session_delete (sm, s0, thread_index, 1);
              next0 = NAT_NEXT_OUT2IN_ED_SLOW_PATH;
              goto trace0;
            }
@@ -775,7 +841,7 @@ nat44_ed_out2in_fast_path_node_fn_inline (vlib_main_t * vm,
 
          old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port;
 
-         if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
+         if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
            {
              if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
                {
@@ -941,10 +1007,12 @@ nat44_ed_out2in_slow_path_node_fn_inline (vlib_main_t * vm,
          snat_session_t *s0 = 0;
          clib_bihash_kv_16_8_t kv0, value0;
          ip_csum_t sum0;
-         snat_session_key_t e_key0, l_key0;
          lb_nat_type_t lb_nat0;
          twice_nat_type_t twice_nat0;
          u8 identity_nat0;
+         ip4_address_t sm_addr;
+         u16 sm_port;
+         u32 sm_fib_index;
 
          /* speculatively enqueue b0 to the current next frame */
          bi0 = from[0];
@@ -978,9 +1046,9 @@ nat44_ed_out2in_slow_path_node_fn_inline (vlib_main_t * vm,
          udp0 = ip4_next_header (ip0);
          tcp0 = (tcp_header_t *) udp0;
          icmp0 = (icmp46_header_t *) udp0;
-         proto0 = ip_proto_to_snat_proto (ip0->protocol);
+         proto0 = ip_proto_to_nat_proto (ip0->protocol);
 
-         if (PREDICT_FALSE (proto0 == ~0))
+         if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
            {
              s0 =
                nat44_ed_out2in_unknown_proto (sm, b0, ip0, rx_fib_index0,
@@ -994,7 +1062,7 @@ nat44_ed_out2in_slow_path_node_fn_inline (vlib_main_t * vm,
              goto trace0;
            }
 
-         if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+         if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
            {
              next0 = icmp_out2in_ed_slow_path
                (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
@@ -1003,20 +1071,23 @@ nat44_ed_out2in_slow_path_node_fn_inline (vlib_main_t * vm,
              goto trace0;
            }
 
-         make_ed_kv (&ip0->dst_address, &ip0->src_address,
-                     ip0->protocol, rx_fib_index0,
-                     vnet_buffer (b0)->ip.reass.l4_dst_port,
-                     vnet_buffer (b0)->ip.reass.l4_src_port, ~0ULL, &kv0);
+         init_ed_k (&kv0, ip0->dst_address,
+                    vnet_buffer (b0)->ip.reass.l4_dst_port, ip0->src_address,
+                    vnet_buffer (b0)->ip.reass.l4_src_port, rx_fib_index0,
+                    ip0->protocol);
 
          s0 = NULL;
-         if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &kv0, &value0))
+         if (!clib_bihash_search_16_8 (&sm->out2in_ed, &kv0, &value0))
            {
-             s0 = pool_elt_at_index (tsm->sessions, value0.value);
+             ASSERT (thread_index == ed_value_get_thread_index (&value0));
+             s0 =
+               pool_elt_at_index (tsm->sessions,
+                                  ed_value_get_session_index (&value0));
 
-             if (s0->tcp_close_timestamp && now >= s0->tcp_close_timestamp)
+             if (s0->tcp_closed_timestamp && now >= s0->tcp_closed_timestamp)
                {
                  nat_free_session_data (sm, s0, thread_index, 0);
-                 nat44_ed_delete_session (sm, s0, thread_index, 1);
+                 nat_ed_session_delete (sm, s0, thread_index, 1);
                  s0 = NULL;
                }
            }
@@ -1025,21 +1096,18 @@ nat44_ed_out2in_slow_path_node_fn_inline (vlib_main_t * vm,
            {
              /* Try to match static mapping by external address and port,
                 destination address and port in packet */
-             e_key0.addr = ip0->dst_address;
-             e_key0.port = vnet_buffer (b0)->ip.reass.l4_dst_port;
-             e_key0.protocol = proto0;
-             e_key0.fib_index = rx_fib_index0;
-
-             if (snat_static_mapping_match (sm, e_key0, &l_key0, 1, 0,
-                                            &twice_nat0, &lb_nat0,
-                                            &ip0->src_address,
-                                            &identity_nat0))
+
+             if (snat_static_mapping_match
+                 (sm, ip0->dst_address,
+                  vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0,
+                  proto0, &sm_addr, &sm_port, &sm_fib_index, 1, 0,
+                  &twice_nat0, &lb_nat0, &ip0->src_address, &identity_nat0))
                {
                  /*
                   * Send DHCP packets to the ipv4 stack, or we won't
                   * be able to use dhcp client on the outside interface
                   */
-                 if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_UDP
+                 if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_UDP
                                     && (vnet_buffer (b0)->ip.
                                         reass.l4_dst_port ==
                                         clib_host_to_net_u16
@@ -1077,7 +1145,7 @@ nat44_ed_out2in_slow_path_node_fn_inline (vlib_main_t * vm,
              if (PREDICT_FALSE (identity_nat0))
                goto trace0;
 
-             if ((proto0 == SNAT_PROTOCOL_TCP)
+             if ((proto0 == NAT_PROTOCOL_TCP)
                  && !tcp_flags_is_init (vnet_buffer (b0)->ip.
                                         reass.icmp_type_or_tcp_flags))
                {
@@ -1087,11 +1155,18 @@ nat44_ed_out2in_slow_path_node_fn_inline (vlib_main_t * vm,
                }
 
              /* Create session initiated by host from external network */
-             s0 = create_session_for_static_mapping_ed (sm, b0, l_key0,
-                                                        e_key0, node,
+             s0 = create_session_for_static_mapping_ed (sm, b0,
+                                                        sm_addr, sm_port,
+                                                        sm_fib_index,
+                                                        ip0->dst_address,
+                                                        vnet_buffer (b0)->
+                                                        ip.reass.l4_dst_port,
+                                                        rx_fib_index0,
+                                                        proto0, node,
+                                                        rx_fib_index0,
                                                         thread_index,
-                                                        twice_nat0,
-                                                        lb_nat0, now);
+                                                        twice_nat0, lb_nat0,
+                                                        now);
              if (!s0)
                {
                  next0 = NAT_NEXT_DROP;
@@ -1114,7 +1189,7 @@ nat44_ed_out2in_slow_path_node_fn_inline (vlib_main_t * vm,
 
          old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port;
 
-         if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
+         if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
            {
              if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
                {
@@ -1244,7 +1319,14 @@ VLIB_NODE_FN (nat44_ed_out2in_node) (vlib_main_t * vm,
                                     vlib_node_runtime_t * node,
                                     vlib_frame_t * frame)
 {
-  return nat44_ed_out2in_fast_path_node_fn_inline (vm, node, frame);
+  if (snat_main.num_workers > 1)
+    {
+      return nat44_ed_out2in_fast_path_node_fn_inline (vm, node, frame, 1);
+    }
+  else
+    {
+      return nat44_ed_out2in_fast_path_node_fn_inline (vm, node, frame, 0);
+    }
 }
 
 /* *INDENT-OFF* */
@@ -1286,7 +1368,8 @@ format_nat_pre_trace (u8 * s, va_list * args)
   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
   nat_pre_trace_t *t = va_arg (*args, nat_pre_trace_t *);
-  return format (s, "out2in next_index %d", t->next_index);
+  return format (s, "out2in next_index %d arc_next_index %d", t->next_index,
+                t->arc_next_index);
 }
 
 VLIB_NODE_FN (nat_pre_out2in_node) (vlib_main_t * vm,