nat: refactor and split fo EI/ED features

This patch is aimed at moving EI features out of NAT44
plugin & split of EI/ED functions.

Type: refactor

Change-Id: I63cf70a264ed2512708fe92665d64f04690783d0
Signed-off-by: Filip Varga <fivarga@cisco.com>

1 files changed, 0 insertions, 1170 deletions

diff --git a/src/plugins/nat/nat_ha.c b/src/plugins/nat/nat_ha.c
deleted file mode 100644
index 08b065dec1d..00000000000
--- a/src/plugins/nat/nat_ha.c
+++ /dev/null
@@ -1,1170 +0,0 @@
-/*
- * Copyright (c) 2019 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.
- */
-
-#include "nat_ha.h"
-#include <vnet/udp/udp_local.h>
-#include <nat/nat.h>
-#include <vppinfra/atomics.h>
-
-/* number of retries */
-#define NAT_HA_RETRIES 3
-
-#define foreach_nat_ha_counter           \
-_(RECV_ADD, "add-event-recv", 0)         \
-_(RECV_DEL, "del-event-recv", 1)         \
-_(RECV_REFRESH, "refresh-event-recv", 2) \
-_(SEND_ADD, "add-event-send", 3)         \
-_(SEND_DEL, "del-event-send", 4)         \
-_(SEND_REFRESH, "refresh-event-send", 5) \
-_(RECV_ACK, "ack-recv", 6)               \
-_(SEND_ACK, "ack-send", 7)               \
-_(RETRY_COUNT, "retry-count", 8)         \
-_(MISSED_COUNT, "missed-count", 9)
-
-/* NAT HA protocol version */
-#define NAT_HA_VERSION 0x01
-
-/* NAT HA protocol flags */
-#define NAT_HA_FLAG_ACK 0x01
-
-/* NAT HA event types */
-typedef enum
-{
-  NAT_HA_ADD = 1,
-  NAT_HA_DEL,
-  NAT_HA_REFRESH,
-} nat_ha_event_type_t;
-
-/* NAT HA protocol header */
-typedef struct
-{
-  /* version */
-  u8 version;
-  /* flags */
-  u8 flags;
-  /* event count */
-  u16 count;
-  /* sequence number */
-  u32 sequence_number;
-  /* thread index where events originated */
-  u32 thread_index;
-} __attribute__ ((packed)) nat_ha_message_header_t;
-
-/* NAT HA protocol event data */
-typedef struct
-{
-  /* event type */
-  u8 event_type;
-  /* session data */
-  u8 protocol;
-  u16 flags;
-  u32 in_addr;
-  u32 out_addr;
-  u16 in_port;
-  u16 out_port;
-  u32 eh_addr;
-  u32 ehn_addr;
-  u16 eh_port;
-  u16 ehn_port;
-  u32 fib_index;
-  u32 total_pkts;
-  u64 total_bytes;
-} __attribute__ ((packed)) nat_ha_event_t;
-
-typedef enum
-{
-#define _(N, s, v) NAT_HA_COUNTER_##N = v,
-  foreach_nat_ha_counter
-#undef _
-  NAT_HA_N_COUNTERS
-} nat_ha_counter_t;
-
-/* data waiting for ACK */
-typedef struct
-{
-  /* sequence number */
-  u32 seq;
-  /* retry count */
-  u32 retry_count;
-  /* next retry time */
-  f64 retry_timer;
-  /* 1 if HA resync */
-  u8 is_resync;
-  /* packet data */
-  u8 *data;
-} nat_ha_resend_entry_t;
-
-/* per thread data */
-typedef struct
-{
-  /* buffer under construction */
-  vlib_buffer_t *state_sync_buffer;
-  /* frame containing NAT HA buffers */
-  vlib_frame_t *state_sync_frame;
-  /* number of events */
-  u16 state_sync_count;
-  /* next event offset */
-  u32 state_sync_next_event_offset;
-  /* data waiting for ACK */
-  nat_ha_resend_entry_t *resend_queue;
-} nat_ha_per_thread_data_t;
-
-/* NAT HA settings */
-typedef struct nat_ha_main_s
-{
-  u8 enabled;
-  /* local IP address and UDP port */
-  ip4_address_t src_ip_address;
-  u16 src_port;
-  /* failvoer IP address and UDP port */
-  ip4_address_t dst_ip_address;
-  u16 dst_port;
-  /* path MTU between local and failover */
-  u32 state_sync_path_mtu;
-  /* number of seconds after which to send session counters refresh */
-  u32 session_refresh_interval;
-  /* counters */
-  vlib_simple_counter_main_t counters[NAT_HA_N_COUNTERS];
-  vlib_main_t *vlib_main;
-  /* sequence number counter */
-  u32 sequence_number;
-  /* 1 if resync in progress */
-  u8 in_resync;
-  /* number of remaing ACK for resync */
-  u32 resync_ack_count;
-  /* number of missed ACK for resync */
-  u32 resync_ack_missed;
-  /* resync data */
-  nat_ha_resync_event_cb_t event_callback;
-  u32 client_index;
-  u32 pid;
-  /* call back functions for received HA events on failover */
-  nat_ha_sadd_cb_t sadd_cb;
-  nat_ha_sdel_cb_t sdel_cb;
-  nat_ha_sref_cb_t sref_cb;
-  /* per thread data */
-  u32 num_workers;
-  nat_ha_per_thread_data_t *per_thread_data;
-  /* worker handoff frame-queue index */
-  u32 fq_index;
-} nat_ha_main_t;
-
-nat_ha_main_t nat_ha_main;
-vlib_node_registration_t nat_ha_process_node;
-vlib_node_registration_t nat_ha_worker_node;
-vlib_node_registration_t nat_ha_node;
-vlib_node_registration_t nat_ha_handoff_node;
-
-static void
-nat_ha_resync_fin (void)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-
-  /* if no more resync ACK remainig we are done */
-  if (ha->resync_ack_count)
-    return;
-
-  ha->in_resync = 0;
-  if (ha->resync_ack_missed)
-    {
-      nat_elog_info ("resync completed with result FAILED");
-    }
-  else
-    {
-      nat_elog_info ("resync completed with result SUCCESS");
-    }
-  if (ha->event_callback)
-    ha->event_callback (ha->client_index, ha->pid, ha->resync_ack_missed);
-}
-
-/* cache HA NAT data waiting for ACK */
-static int
-nat_ha_resend_queue_add (u32 seq, u8 * data, u8 data_len, u8 is_resync,
-			 u32 thread_index)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  nat_ha_per_thread_data_t *td = &ha->per_thread_data[thread_index];
-  nat_ha_resend_entry_t *entry;
-  f64 now = vlib_time_now (ha->vlib_main);
-
-  vec_add2 (td->resend_queue, entry, 1);
-  clib_memset (entry, 0, sizeof (*entry));
-  entry->retry_timer = now + 2.0;
-  entry->seq = seq;
-  entry->is_resync = is_resync;
-  vec_add (entry->data, data, data_len);
-
-  return 0;
-}
-
-static_always_inline void
-nat_ha_ack_recv (u32 seq, u32 thread_index)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  nat_ha_per_thread_data_t *td = &ha->per_thread_data[thread_index];
-  u32 i;
-
-  vec_foreach_index (i, td->resend_queue)
-  {
-    if (td->resend_queue[i].seq != seq)
-      continue;
-
-    vlib_increment_simple_counter (&ha->counters[NAT_HA_COUNTER_RECV_ACK],
-				   thread_index, 0, 1);
-    /* ACK received remove cached data */
-    if (td->resend_queue[i].is_resync)
-      {
-	clib_atomic_fetch_sub (&ha->resync_ack_count, 1);
-	nat_ha_resync_fin ();
-      }
-    vec_free (td->resend_queue[i].data);
-    vec_del1 (td->resend_queue, i);
-    nat_elog_debug_X1 ("ACK for seq %d received", "i4",
-		       clib_net_to_host_u32 (seq));
-
-    return;
-  }
-}
-
-/* scan non-ACKed HA NAT for retry */
-static void
-nat_ha_resend_scan (f64 now, u32 thread_index)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  nat_ha_per_thread_data_t *td = &ha->per_thread_data[thread_index];
-  u32 i, *del, *to_delete = 0;
-  vlib_main_t *vm = ha->vlib_main;
-  vlib_buffer_t *b = 0;
-  vlib_frame_t *f;
-  u32 bi, *to_next;
-  ip4_header_t *ip;
-
-  vec_foreach_index (i, td->resend_queue)
-  {
-    if (td->resend_queue[i].retry_timer > now)
-      continue;
-
-    /* maximum retry reached delete cached data */
-    if (td->resend_queue[i].retry_count >= NAT_HA_RETRIES)
-      {
-	nat_elog_notice_X1 ("seq %d missed", "i4",
-			    clib_net_to_host_u32 (td->resend_queue[i].seq));
-	if (td->resend_queue[i].is_resync)
-	  {
-	    clib_atomic_fetch_add (&ha->resync_ack_missed, 1);
-	    clib_atomic_fetch_sub (&ha->resync_ack_count, 1);
-	    nat_ha_resync_fin ();
-	  }
-	vec_add1 (to_delete, i);
-	vlib_increment_simple_counter (&ha->counters
-				       [NAT_HA_COUNTER_MISSED_COUNT],
-				       thread_index, 0, 1);
-	continue;
-      }
-
-    /* retry to send non-ACKed data */
-    nat_elog_debug_X1 ("state sync seq %d resend", "i4",
-		       clib_net_to_host_u32 (td->resend_queue[i].seq));
-    td->resend_queue[i].retry_count++;
-    vlib_increment_simple_counter (&ha->counters[NAT_HA_COUNTER_RETRY_COUNT],
-				   thread_index, 0, 1);
-    if (vlib_buffer_alloc (vm, &bi, 1) != 1)
-      {
-	nat_elog_warn ("HA NAT state sync can't allocate buffer");
-	return;
-      }
-    b = vlib_get_buffer (vm, bi);
-    b->current_length = vec_len (td->resend_queue[i].data);
-    b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
-    b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
-    vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
-    vnet_buffer (b)->sw_if_index[VLIB_TX] = 0;
-    ip = vlib_buffer_get_current (b);
-    clib_memcpy (ip, td->resend_queue[i].data,
-		 vec_len (td->resend_queue[i].data));
-    f = vlib_get_frame_to_node (vm, ip4_lookup_node.index);
-    to_next = vlib_frame_vector_args (f);
-    to_next[0] = bi;
-    f->n_vectors = 1;
-    vlib_put_frame_to_node (vm, ip4_lookup_node.index, f);
-    td->resend_queue[i].retry_timer = now + 2.0;
-  }
-
-  vec_foreach (del, to_delete)
-  {
-    vec_free (td->resend_queue[*del].data);
-    vec_del1 (td->resend_queue, *del);
-  }
-  vec_free (to_delete);
-}
-
-void
-nat_ha_enable (nat_ha_sadd_cb_t sadd_cb,
-	       nat_ha_sdel_cb_t sdel_cb, nat_ha_sref_cb_t sref_cb)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-
-  ha->sadd_cb = sadd_cb;
-  ha->sdel_cb = sdel_cb;
-  ha->sref_cb = sref_cb;
-
-  ha->enabled = 1;
-}
-
-void
-nat_ha_disable ()
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  ha->dst_port = 0;
-  ha->enabled = 0;
-}
-
-void
-nat_ha_init (vlib_main_t * vm, u32 num_workers, u32 num_threads)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  clib_memset (ha, 0, sizeof (*ha));
-
-  ha->vlib_main = vm;
-  ha->fq_index = ~0;
-
-  ha->num_workers = num_workers;
-  vec_validate (ha->per_thread_data, num_threads);
-
-#define _(N, s, v) ha->counters[v].name = s;          \
-  ha->counters[v].stat_segment_name = "/nat44/ha/" s; \
-  vlib_validate_simple_counter(&ha->counters[v], 0);  \
-  vlib_zero_simple_counter(&ha->counters[v], 0);
-  foreach_nat_ha_counter
-#undef _
-}
-
-int
-nat_ha_set_listener (ip4_address_t * addr, u16 port, u32 path_mtu)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-
-  /* unregister previously set UDP port */
-  if (ha->src_port)
-    udp_unregister_dst_port (ha->vlib_main, ha->src_port, 1);
-
-  ha->src_ip_address.as_u32 = addr->as_u32;
-  ha->src_port = port;
-  ha->state_sync_path_mtu = path_mtu;
-
-  if (port)
-    {
-      /* if multiple worker threads first go to handoff node */
-      if (ha->num_workers > 1)
-	{
-	  if (ha->fq_index == ~0)
-	    ha->fq_index = vlib_frame_queue_main_init (nat_ha_node.index, 0);
-	  udp_register_dst_port (ha->vlib_main, port,
-				 nat_ha_handoff_node.index, 1);
-	}
-      else
-	{
-	  udp_register_dst_port (ha->vlib_main, port, nat_ha_node.index, 1);
-	}
-      nat_elog_info_X1 ("HA listening on port %d for state sync", "i4", port);
-    }
-
-  return 0;
-}
-
-void
-nat_ha_get_listener (ip4_address_t * addr, u16 * port, u32 * path_mtu)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-
-  addr->as_u32 = ha->src_ip_address.as_u32;
-  *port = ha->src_port;
-  *path_mtu = ha->state_sync_path_mtu;
-}
-
-int
-nat_ha_set_failover (ip4_address_t * addr, u16 port,
-		     u32 session_refresh_interval)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-
-  ha->dst_ip_address.as_u32 = addr->as_u32;
-  ha->dst_port = port;
-  ha->session_refresh_interval = session_refresh_interval;
-
-  vlib_process_signal_event (ha->vlib_main, nat_ha_process_node.index, 1, 0);
-
-  return 0;
-}
-
-void
-nat_ha_get_failover (ip4_address_t * addr, u16 * port,
-		     u32 * session_refresh_interval)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-
-  addr->as_u32 = ha->dst_ip_address.as_u32;
-  *port = ha->dst_port;
-  *session_refresh_interval = ha->session_refresh_interval;
-}
-
-static_always_inline void
-nat_ha_recv_add (nat_ha_event_t * event, f64 now, u32 thread_index)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  ip4_address_t in_addr, out_addr, eh_addr, ehn_addr;
-  u32 fib_index;
-  u16 flags;
-
-  vlib_increment_simple_counter (&ha->counters[NAT_HA_COUNTER_RECV_ADD],
-				 thread_index, 0, 1);
-
-  in_addr.as_u32 = event->in_addr;
-  out_addr.as_u32 = event->out_addr;
-  eh_addr.as_u32 = event->eh_addr;
-  ehn_addr.as_u32 = event->ehn_addr;
-  fib_index = clib_net_to_host_u32 (event->fib_index);
-  flags = clib_net_to_host_u16 (event->flags);
-
-  ha->sadd_cb (&in_addr, event->in_port, &out_addr, event->out_port, &eh_addr,
-	       event->eh_port, &ehn_addr, event->ehn_port, event->protocol,
-	       fib_index, flags, thread_index);
-}
-
-static_always_inline void
-nat_ha_recv_del (nat_ha_event_t * event, u32 thread_index)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  ip4_address_t out_addr, eh_addr;
-  u32 fib_index;
-
-  vlib_increment_simple_counter (&ha->counters[NAT_HA_COUNTER_RECV_DEL],
-				 thread_index, 0, 1);
-
-  out_addr.as_u32 = event->out_addr;
-  eh_addr.as_u32 = event->eh_addr;
-  fib_index = clib_net_to_host_u32 (event->fib_index);
-
-  ha->sdel_cb (&out_addr, event->out_port, &eh_addr, event->eh_port,
-	       event->protocol, fib_index, thread_index);
-}
-
-static_always_inline void
-nat_ha_recv_refresh (nat_ha_event_t * event, f64 now, u32 thread_index)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  ip4_address_t out_addr, eh_addr;
-  u32 fib_index, total_pkts;
-  u64 total_bytes;
-
-  vlib_increment_simple_counter (&ha->counters[NAT_HA_COUNTER_RECV_REFRESH],
-				 thread_index, 0, 1);
-
-  out_addr.as_u32 = event->out_addr;
-  eh_addr.as_u32 = event->eh_addr;
-  fib_index = clib_net_to_host_u32 (event->fib_index);
-  total_pkts = clib_net_to_host_u32 (event->total_pkts);
-  total_bytes = clib_net_to_host_u64 (event->total_bytes);
-
-  ha->sref_cb (&out_addr, event->out_port, &eh_addr, event->eh_port,
-	       event->protocol, fib_index, total_pkts, total_bytes,
-	       thread_index);
-}
-
-/* process received NAT HA event */
-static_always_inline void
-nat_ha_event_process (nat_ha_event_t * event, f64 now, u32 thread_index)
-{
-  switch (event->event_type)
-    {
-    case NAT_HA_ADD:
-      nat_ha_recv_add (event, now, thread_index);
-      break;
-    case NAT_HA_DEL:
-      nat_ha_recv_del (event, thread_index);
-      break;
-    case NAT_HA_REFRESH:
-      nat_ha_recv_refresh (event, now, thread_index);
-      break;
-    default:
-      nat_elog_notice_X1 ("Unsupported HA event type %d", "i4",
-			  event->event_type);
-      break;
-    }
-}
-
-static inline void
-nat_ha_header_create (vlib_buffer_t * b, u32 * offset, u32 thread_index)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  nat_ha_message_header_t *h;
-  ip4_header_t *ip;
-  udp_header_t *udp;
-  u32 sequence_number;
-
-  b->current_data = 0;
-  b->current_length = sizeof (*ip) + sizeof (*udp) + sizeof (*h);
-  b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
-  b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
-  vnet_buffer (b)->sw_if_index[VLIB_RX] = 0;
-  vnet_buffer (b)->sw_if_index[VLIB_TX] = 0;
-  ip = vlib_buffer_get_current (b);
-  udp = (udp_header_t *) (ip + 1);
-  h = (nat_ha_message_header_t *) (udp + 1);
-
-  /* IP header */
-  ip->ip_version_and_header_length = 0x45;
-  ip->ttl = 254;
-  ip->protocol = IP_PROTOCOL_UDP;
-  ip->flags_and_fragment_offset =
-    clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT);
-  ip->src_address.as_u32 = ha->src_ip_address.as_u32;
-  ip->dst_address.as_u32 = ha->dst_ip_address.as_u32;
-  /* UDP header */
-  udp->src_port = clib_host_to_net_u16 (ha->src_port);
-  udp->dst_port = clib_host_to_net_u16 (ha->dst_port);
-  udp->checksum = 0;
-
-  /* NAT HA protocol header */
-  h->version = NAT_HA_VERSION;
-  h->flags = 0;
-  h->count = 0;
-  h->thread_index = clib_host_to_net_u32 (thread_index);
-  sequence_number = clib_atomic_fetch_add (&ha->sequence_number, 1);
-  h->sequence_number = clib_host_to_net_u32 (sequence_number);
-
-  *offset =
-    sizeof (ip4_header_t) + sizeof (udp_header_t) +
-    sizeof (nat_ha_message_header_t);
-}
-
-static inline void
-nat_ha_send (vlib_frame_t * f, vlib_buffer_t * b, u8 is_resync,
-	     u32 thread_index)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  nat_ha_per_thread_data_t *td = &ha->per_thread_data[thread_index];
-  nat_ha_message_header_t *h;
-  ip4_header_t *ip;
-  udp_header_t *udp;
-  vlib_main_t *vm = vlib_mains[thread_index];
-
-  ip = vlib_buffer_get_current (b);
-  udp = ip4_next_header (ip);
-  h = (nat_ha_message_header_t *) (udp + 1);
-
-  h->count = clib_host_to_net_u16 (td->state_sync_count);
-
-  ip->length = clib_host_to_net_u16 (b->current_length);
-  ip->checksum = ip4_header_checksum (ip);
-  udp->length = clib_host_to_net_u16 (b->current_length - sizeof (*ip));
-
-  nat_ha_resend_queue_add (h->sequence_number, (u8 *) ip, b->current_length,
-			   is_resync, thread_index);
-
-  vlib_put_frame_to_node (vm, ip4_lookup_node.index, f);
-}
-
-/* add NAT HA protocol event */
-static_always_inline void
-nat_ha_event_add (nat_ha_event_t * event, u8 do_flush, u32 thread_index,
-		  u8 is_resync)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  nat_ha_per_thread_data_t *td = &ha->per_thread_data[thread_index];
-  vlib_main_t *vm = vlib_mains[thread_index];
-  vlib_buffer_t *b = 0;
-  vlib_frame_t *f;
-  u32 bi = ~0, offset;
-
-  b = td->state_sync_buffer;
-
-  if (PREDICT_FALSE (b == 0))
-    {
-      if (do_flush)
-	return;
-
-      if (vlib_buffer_alloc (vm, &bi, 1) != 1)
-	{
-	  nat_elog_warn ("HA NAT state sync can't allocate buffer");
-	  return;
-	}
-
-      b = td->state_sync_buffer = vlib_get_buffer (vm, bi);
-      clib_memset (vnet_buffer (b), 0, sizeof (*vnet_buffer (b)));
-      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
-      offset = 0;
-    }
-  else
-    {
-      bi = vlib_get_buffer_index (vm, b);
-      offset = td->state_sync_next_event_offset;
-    }
-
-  f = td->state_sync_frame;
-  if (PREDICT_FALSE (f == 0))
-    {
-      u32 *to_next;
-      f = vlib_get_frame_to_node (vm, ip4_lookup_node.index);
-      td->state_sync_frame = f;
-      to_next = vlib_frame_vector_args (f);
-      to_next[0] = bi;
-      f->n_vectors = 1;
-    }
-
-  if (PREDICT_FALSE (td->state_sync_count == 0))
-    nat_ha_header_create (b, &offset, thread_index);
-
-  if (PREDICT_TRUE (do_flush == 0))
-    {
-      clib_memcpy_fast (b->data + offset, event, sizeof (*event));
-      offset += sizeof (*event);
-      td->state_sync_count++;
-      b->current_length += sizeof (*event);
-
-      switch (event->event_type)
-	{
-	case NAT_HA_ADD:
-	  vlib_increment_simple_counter (&ha->counters
-					 [NAT_HA_COUNTER_SEND_ADD],
-					 thread_index, 0, 1);
-	  break;
-	case NAT_HA_DEL:
-	  vlib_increment_simple_counter (&ha->counters
-					 [NAT_HA_COUNTER_SEND_DEL],
-					 thread_index, 0, 1);
-	  break;
-	case NAT_HA_REFRESH:
-	  vlib_increment_simple_counter (&ha->counters
-					 [NAT_HA_COUNTER_SEND_REFRESH],
-					 thread_index, 0, 1);
-	  break;
-	default:
-	  break;
-	}
-    }
-
-  if (PREDICT_FALSE
-      (do_flush || offset + (sizeof (*event)) > ha->state_sync_path_mtu))
-    {
-      nat_ha_send (f, b, is_resync, thread_index);
-      td->state_sync_buffer = 0;
-      td->state_sync_frame = 0;
-      td->state_sync_count = 0;
-      offset = 0;
-      if (is_resync)
-	{
-	  clib_atomic_fetch_add (&ha->resync_ack_count, 1);
-	  nat_ha_resync_fin ();
-	}
-    }
-
-  td->state_sync_next_event_offset = offset;
-}
-
-#define skip_if_disabled()          \
-do {                                \
-  nat_ha_main_t *ha = &nat_ha_main; \
-  if (PREDICT_TRUE (!ha->dst_port)) \
-    return;                         \
-} while (0)
-
-void
-nat_ha_flush (u8 is_resync)
-{
-  skip_if_disabled ();
-  nat_ha_event_add (0, 1, 0, is_resync);
-}
-
-void
-nat_ha_sadd (ip4_address_t * in_addr, u16 in_port, ip4_address_t * out_addr,
-	     u16 out_port, ip4_address_t * eh_addr, u16 eh_port,
-	     ip4_address_t * ehn_addr, u16 ehn_port, u8 proto, u32 fib_index,
-	     u16 flags, u32 thread_index, u8 is_resync)
-{
-  nat_ha_event_t event;
-
-  skip_if_disabled ();
-
-  clib_memset (&event, 0, sizeof (event));
-  event.event_type = NAT_HA_ADD;
-  event.flags = clib_host_to_net_u16 (flags);
-  event.in_addr = in_addr->as_u32;
-  event.in_port = in_port;
-  event.out_addr = out_addr->as_u32;
-  event.out_port = out_port;
-  event.eh_addr = eh_addr->as_u32;
-  event.eh_port = eh_port;
-  event.ehn_addr = ehn_addr->as_u32;
-  event.ehn_port = ehn_port;
-  event.fib_index = clib_host_to_net_u32 (fib_index);
-  event.protocol = proto;
-  nat_ha_event_add (&event, 0, thread_index, is_resync);
-}
-
-void
-nat_ha_sdel (ip4_address_t * out_addr, u16 out_port, ip4_address_t * eh_addr,
-	     u16 eh_port, u8 proto, u32 fib_index, u32 thread_index)
-{
-  nat_ha_event_t event;
-
-  skip_if_disabled ();
-
-  clib_memset (&event, 0, sizeof (event));
-  event.event_type = NAT_HA_DEL;
-  event.out_addr = out_addr->as_u32;
-  event.out_port = out_port;
-  event.eh_addr = eh_addr->as_u32;
-  event.eh_port = eh_port;
-  event.fib_index = clib_host_to_net_u32 (fib_index);
-  event.protocol = proto;
-  nat_ha_event_add (&event, 0, thread_index, 0);
-}
-
-void
-nat_ha_sref (ip4_address_t * out_addr, u16 out_port, ip4_address_t * eh_addr,
-	     u16 eh_port, u8 proto, u32 fib_index, u32 total_pkts,
-	     u64 total_bytes, u32 thread_index, f64 * last_refreshed, f64 now)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  nat_ha_event_t event;
-
-  skip_if_disabled ();
-
-  if ((*last_refreshed + ha->session_refresh_interval) > now)
-    return;
-
-  *last_refreshed = now;
-  clib_memset (&event, 0, sizeof (event));
-  event.event_type = NAT_HA_REFRESH;
-  event.out_addr = out_addr->as_u32;
-  event.out_port = out_port;
-  event.eh_addr = eh_addr->as_u32;
-  event.eh_port = eh_port;
-  event.fib_index = clib_host_to_net_u32 (fib_index);
-  event.protocol = proto;
-  event.total_pkts = clib_host_to_net_u32 (total_pkts);
-  event.total_bytes = clib_host_to_net_u64 (total_bytes);
-  nat_ha_event_add (&event, 0, thread_index, 0);
-}
-
-static_always_inline u8
-plugin_enabled ()
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  return ha->enabled;
-}
-
-/* per thread process waiting for interrupt */
-static uword
-nat_ha_worker_fn (vlib_main_t * vm, vlib_node_runtime_t * rt,
-		  vlib_frame_t * f)
-{
-  u32 thread_index = vm->thread_index;
-
-  if (plugin_enabled () == 0)
-    return 0;
-
-  /* flush HA NAT data under construction */
-  nat_ha_event_add (0, 1, thread_index, 0);
-  /* scan if we need to resend some non-ACKed data */
-  nat_ha_resend_scan (vlib_time_now (vm), thread_index);
-  return 0;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat_ha_worker_node) = {
-    .function = nat_ha_worker_fn,
-    .type = VLIB_NODE_TYPE_INPUT,
-    .state = VLIB_NODE_STATE_INTERRUPT,
-    .name = "nat-ha-worker",
-};
-/* *INDENT-ON* */
-
-/* periodically send interrupt to each thread */
-static uword
-nat_ha_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  uword event_type;
-  uword *event_data = 0;
-  u32 ti;
-
-  vlib_process_wait_for_event (vm);
-  event_type = vlib_process_get_events (vm, &event_data);
-  if (event_type)
-    nat_elog_info ("nat-ha-process: bogus kickoff event received");
-  vec_reset_length (event_data);
-
-  while (1)
-    {
-      vlib_process_wait_for_event_or_clock (vm, 1.0);
-      event_type = vlib_process_get_events (vm, &event_data);
-      vec_reset_length (event_data);
-      for (ti = 0; ti < vec_len (vlib_mains); ti++)
-	{
-	  if (ti >= vec_len (ha->per_thread_data))
-	    continue;
-
-	  vlib_node_set_interrupt_pending (vlib_mains[ti],
-					   nat_ha_worker_node.index);
-	}
-    }
-
-  return 0;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat_ha_process_node) = {
-    .function = nat_ha_process,
-    .type = VLIB_NODE_TYPE_PROCESS,
-    .name = "nat-ha-process",
-};
-/* *INDENT-ON* */
-
-void
-nat_ha_get_resync_status (u8 * in_resync, u32 * resync_ack_missed)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-
-  *in_resync = ha->in_resync;
-  *resync_ack_missed = ha->resync_ack_missed;
-}
-
-typedef struct
-{
-  ip4_address_t addr;
-  u32 event_count;
-} nat_ha_trace_t;
-
-static u8 *
-format_nat_ha_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_ha_trace_t *t = va_arg (*args, nat_ha_trace_t *);
-
-  s =
-    format (s, "nat-ha: %u events from %U", t->event_count,
-	    format_ip4_address, &t->addr);
-
-  return s;
-}
-
-typedef enum
-{
-  NAT_HA_NEXT_IP4_LOOKUP,
-  NAT_HA_NEXT_DROP,
-  NAT_HA_N_NEXT,
-} nat_ha_next_t;
-
-#define foreach_nat_ha_error   \
-_(PROCESSED, "pkts-processed") \
-_(BAD_VERSION, "bad-version")
-
-typedef enum
-{
-#define _(sym, str) NAT_HA_ERROR_##sym,
-  foreach_nat_ha_error
-#undef _
-    NAT_HA_N_ERROR,
-} nat_ha_error_t;
-
-static char *nat_ha_error_strings[] = {
-#define _(sym, str) str,
-  foreach_nat_ha_error
-#undef _
-};
-
-/* process received HA NAT protocol messages */
-static uword
-nat_ha_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
-		vlib_frame_t * frame)
-{
-  u32 n_left_from, *from, next_index, *to_next;
-  f64 now = vlib_time_now (vm);
-  u32 thread_index = vm->thread_index;
-  u32 pkts_processed = 0;
-  ip4_main_t *i4m = &ip4_main;
-  u8 host_config_ttl = i4m->host_config.ttl;
-  nat_ha_main_t *ha = &nat_ha_main;
-
-  from = vlib_frame_vector_args (frame);
-  n_left_from = frame->n_vectors;
-  next_index = node->cached_next_index;
-
-  while (n_left_from > 0)
-    {
-      u32 n_left_to_next;
-
-      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
-
-      while (n_left_from > 0 && n_left_to_next > 0)
-	{
-	  u32 bi0, next0, src_addr0, dst_addr0;;
-	  vlib_buffer_t *b0;
-	  nat_ha_message_header_t *h0;
-	  nat_ha_event_t *e0;
-	  u16 event_count0, src_port0, dst_port0, old_len0;
-	  ip4_header_t *ip0;
-	  udp_header_t *udp0;
-	  ip_csum_t sum0;
-
-	  bi0 = from[0];
-	  to_next[0] = bi0;
-	  from += 1;
-	  to_next += 1;
-	  n_left_from -= 1;
-	  n_left_to_next -= 1;
-
-	  b0 = vlib_get_buffer (vm, bi0);
-	  h0 = vlib_buffer_get_current (b0);
-	  vlib_buffer_advance (b0, -sizeof (*udp0));
-	  udp0 = vlib_buffer_get_current (b0);
-	  vlib_buffer_advance (b0, -sizeof (*ip0));
-	  ip0 = vlib_buffer_get_current (b0);
-
-	  next0 = NAT_HA_NEXT_DROP;
-
-	  if (h0->version != NAT_HA_VERSION)
-	    {
-	      b0->error = node->errors[NAT_HA_ERROR_BAD_VERSION];
-	      goto done0;
-	    }
-
-	  event_count0 = clib_net_to_host_u16 (h0->count);
-	  /* ACK for previously send data */
-	  if (!event_count0 && (h0->flags & NAT_HA_FLAG_ACK))
-	    {
-	      nat_ha_ack_recv (h0->sequence_number, thread_index);
-	      b0->error = node->errors[NAT_HA_ERROR_PROCESSED];
-	      goto done0;
-	    }
-
-	  e0 = (nat_ha_event_t *) (h0 + 1);
-
-	  /* process each event */
-	  while (event_count0)
-	    {
-	      nat_ha_event_process (e0, now, thread_index);
-	      event_count0--;
-	      e0 = (nat_ha_event_t *) ((u8 *) e0 + sizeof (nat_ha_event_t));
-	    }
-
-	  next0 = NAT_HA_NEXT_IP4_LOOKUP;
-	  pkts_processed++;
-
-	  /* reply with ACK */
-	  b0->current_length = sizeof (*ip0) + sizeof (*udp0) + sizeof (*h0);
-
-	  src_addr0 = ip0->src_address.data_u32;
-	  dst_addr0 = ip0->dst_address.data_u32;
-	  ip0->src_address.data_u32 = dst_addr0;
-	  ip0->dst_address.data_u32 = src_addr0;
-	  old_len0 = ip0->length;
-	  ip0->length = clib_host_to_net_u16 (b0->current_length);
-
-	  sum0 = ip0->checksum;
-	  sum0 = ip_csum_update (sum0, ip0->ttl, host_config_ttl,
-				 ip4_header_t, ttl);
-	  ip0->ttl = host_config_ttl;
-	  sum0 =
-	    ip_csum_update (sum0, old_len0, ip0->length, ip4_header_t,
-			    length);
-	  ip0->checksum = ip_csum_fold (sum0);
-
-	  udp0->checksum = 0;
-	  src_port0 = udp0->src_port;
-	  dst_port0 = udp0->dst_port;
-	  udp0->src_port = dst_port0;
-	  udp0->dst_port = src_port0;
-	  udp0->length =
-	    clib_host_to_net_u16 (b0->current_length - sizeof (*ip0));
-
-	  h0->flags = NAT_HA_FLAG_ACK;
-	  h0->count = 0;
-	  vlib_increment_simple_counter (&ha->counters
-					 [NAT_HA_COUNTER_SEND_ACK],
-					 thread_index, 0, 1);
-
-	done0:
-	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
-			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
-	    {
-	      nat_ha_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
-	      ip4_header_t *ip =
-		(void *) (b0->data + vnet_buffer (b0)->l3_hdr_offset);
-	      t->event_count = clib_net_to_host_u16 (h0->count);
-	      t->addr.as_u32 = ip->src_address.data_u32;
-	    }
-
-	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
-					   to_next, n_left_to_next,
-					   bi0, next0);
-	}
-
-      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
-    }
-
-  vlib_node_increment_counter (vm, nat_ha_node.index,
-			       NAT_HA_ERROR_PROCESSED, pkts_processed);
-
-  return frame->n_vectors;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat_ha_node) = {
-  .function = nat_ha_node_fn,
-  .name = "nat-ha",
-  .vector_size = sizeof (u32),
-  .format_trace = format_nat_ha_trace,
-  .type = VLIB_NODE_TYPE_INTERNAL,
-  .n_errors = ARRAY_LEN (nat_ha_error_strings),
-  .error_strings = nat_ha_error_strings,
-  .n_next_nodes = NAT_HA_N_NEXT,
-  .next_nodes = {
-     [NAT_HA_NEXT_IP4_LOOKUP] = "ip4-lookup",
-     [NAT_HA_NEXT_DROP] = "error-drop",
-  },
-};
-/* *INDENT-ON* */
-
-typedef struct
-{
-  u32 next_worker_index;
-  u8 in2out;
-} nat_ha_handoff_trace_t;
-
-#define foreach_nat_ha_handoff_error  \
-_(CONGESTION_DROP, "congestion drop") \
-_(SAME_WORKER, "same worker")         \
-_(DO_HANDOFF, "do handoff")
-
-typedef enum
-{
-#define _(sym,str) NAT_HA_HANDOFF_ERROR_##sym,
-  foreach_nat_ha_handoff_error
-#undef _
-    NAT_HA_HANDOFF_N_ERROR,
-} nat_ha_handoff_error_t;
-
-static char *nat_ha_handoff_error_strings[] = {
-#define _(sym,string) string,
-  foreach_nat_ha_handoff_error
-#undef _
-};
-
-static u8 *
-format_nat_ha_handoff_trace (u8 * s, va_list * args)
-{
-  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
-  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
-  nat_ha_handoff_trace_t *t = va_arg (*args, nat_ha_handoff_trace_t *);
-
-  s =
-    format (s, "NAT_HA_WORKER_HANDOFF: next-worker %d", t->next_worker_index);
-
-  return s;
-}
-
-/* do worker handoff based on thread_index in NAT HA protcol header */
-static uword
-nat_ha_handoff_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
-			vlib_frame_t * frame)
-{
-  nat_ha_main_t *ha = &nat_ha_main;
-  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
-  u32 n_enq, n_left_from, *from;
-  u16 thread_indices[VLIB_FRAME_SIZE], *ti;
-  u32 thread_index = vm->thread_index;
-  u32 do_handoff = 0, same_worker = 0;
-
-  from = vlib_frame_vector_args (frame);
-  n_left_from = frame->n_vectors;
-  vlib_get_buffers (vm, from, bufs, n_left_from);
-
-  b = bufs;
-  ti = thread_indices;
-
-  while (n_left_from > 0)
-    {
-      nat_ha_message_header_t *h0;
-
-      h0 = vlib_buffer_get_current (b[0]);
-      ti[0] = clib_net_to_host_u32 (h0->thread_index);
-
-      if (ti[0] != thread_index)
-	do_handoff++;
-      else
-	same_worker++;
-
-      if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
-			 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
-	{
-	  nat_ha_handoff_trace_t *t =
-	    vlib_add_trace (vm, node, b[0], sizeof (*t));
-	  t->next_worker_index = ti[0];
-	}
-
-      n_left_from -= 1;
-      ti += 1;
-      b += 1;
-    }
-
-  n_enq =
-    vlib_buffer_enqueue_to_thread (vm, ha->fq_index, from, thread_indices,
-				   frame->n_vectors, 1);
-
-  if (n_enq < frame->n_vectors)
-    vlib_node_increment_counter (vm, node->node_index,
-				 NAT_HA_HANDOFF_ERROR_CONGESTION_DROP,
-				 frame->n_vectors - n_enq);
-  vlib_node_increment_counter (vm, node->node_index,
-			       NAT_HA_HANDOFF_ERROR_SAME_WORKER, same_worker);
-  vlib_node_increment_counter (vm, node->node_index,
-			       NAT_HA_HANDOFF_ERROR_DO_HANDOFF, do_handoff);
-  return frame->n_vectors;
-}
-
-int
-nat_ha_resync (u32 client_index, u32 pid,
-	       nat_ha_resync_event_cb_t event_callback)
-{
-  return 0;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat_ha_handoff_node) = {
-  .function = nat_ha_handoff_node_fn,
-  .name = "nat-ha-handoff",
-  .vector_size = sizeof (u32),
-  .format_trace = format_nat_ha_handoff_trace,
-  .type = VLIB_NODE_TYPE_INTERNAL,
-  .n_errors = ARRAY_LEN(nat_ha_handoff_error_strings),
-  .error_strings = nat_ha_handoff_error_strings,
-  .n_next_nodes = 1,
-  .next_nodes = {
-    [0] = "error-drop",
-  },
-};
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */