NAT: Rename snat plugin to nat (VPP-955)

Change-Id: I30a7e3da7a4efc6038a91e27b48045d4b07e2764
Signed-off-by: Matus Fabian <matfabia@cisco.com>

1 files changed, 835 insertions, 0 deletions

diff --git a/src/plugins/nat/nat_ipfix_logging.c b/src/plugins/nat/nat_ipfix_logging.c
new file mode 100644
index 00000000000..0cc0f82a337
--- /dev/null
+++ b/src/plugins/nat/nat_ipfix_logging.c
@@ -0,0 +1,835 @@
+/*
+ * nat_ipfix_logging.c - NAT Events IPFIX logging
+ *
+ * Copyright (c) 2016 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 <vnet/flow/flow_report.h>
+#include <vlibmemory/api.h>
+#include <nat/nat.h>
+#include <nat/nat_ipfix_logging.h>
+
+snat_ipfix_logging_main_t snat_ipfix_logging_main;
+
+#define NAT44_SESSION_CREATE_LEN 26
+#define NAT_ADDRESSES_EXHAUTED_LEN 13
+#define MAX_ENTRIES_PER_USER_LEN 17
+
+#define NAT44_SESSION_CREATE_FIELD_COUNT 8
+#define NAT_ADDRESSES_EXHAUTED_FIELD_COUNT 3
+#define MAX_ENTRIES_PER_USER_FIELD_COUNT 4
+
+typedef struct {
+  u8 nat_event;
+  u32 src_ip;
+  u32 nat_src_ip;
+  snat_protocol_t snat_proto;
+  u16 src_port;
+  u16 nat_src_port;
+  u32 vrf_id;
+} snat_ipfix_logging_nat44_ses_args_t;
+
+typedef struct {
+  u32 pool_id;
+} snat_ipfix_logging_addr_exhausted_args_t;
+
+typedef struct {
+  u32 src_ip;
+} snat_ipfix_logging_max_entries_per_user_args_t;
+
+/**
+ * @brief Create an IPFIX template packet rewrite string
+ *
+ * @param frm               flow report main
+ * @param fr                flow report
+ * @param collector_address collector address
+ * @param src_address       source address
+ * @param collector_port    collector
+ * @param event             NAT event ID
+ * @param quota_event       NAT quota exceeded event ID
+ *
+ * @returns template packet
+ */
+static inline u8 *
+snat_template_rewrite (flow_report_main_t * frm,
+                       flow_report_t * fr,
+                       ip4_address_t * collector_address,
+                       ip4_address_t * src_address,
+                       u16 collector_port,
+                       nat_event_t event,
+                       quota_exceed_event_t quota_event)
+{
+  snat_ipfix_logging_main_t *silm = &snat_ipfix_logging_main;
+  ip4_header_t *ip;
+  udp_header_t *udp;
+  ipfix_message_header_t *h;
+  ipfix_set_header_t *s;
+  ipfix_template_header_t *t;
+  ipfix_field_specifier_t *f;
+  ipfix_field_specifier_t *first_field;
+  u8 *rewrite = 0;
+  ip4_ipfix_template_packet_t *tp;
+  u32 field_count = 0;
+  flow_report_stream_t *stream;
+
+  stream = &frm->streams[fr->stream_index];
+  silm->stream_index = fr->stream_index;
+
+  if (event == NAT_ADDRESSES_EXHAUTED)
+    {
+      field_count = NAT_ADDRESSES_EXHAUTED_FIELD_COUNT;
+      silm->addr_exhausted_template_id = fr->template_id;
+    }
+  else if (event == NAT44_SESSION_CREATE)
+    {
+      field_count = NAT44_SESSION_CREATE_FIELD_COUNT;
+      silm->nat44_session_template_id = fr->template_id;
+    }
+  else if (event == QUOTA_EXCEEDED)
+    {
+      if (quota_event == MAX_ENTRIES_PER_USER)
+        {
+          field_count = MAX_ENTRIES_PER_USER_FIELD_COUNT;
+          silm->max_entries_per_user_template_id = fr->template_id;
+        }
+    }
+
+  /* allocate rewrite space */
+  vec_validate_aligned (rewrite,
+			sizeof (ip4_ipfix_template_packet_t)
+			+ field_count * sizeof (ipfix_field_specifier_t) - 1,
+			CLIB_CACHE_LINE_BYTES);
+
+  tp = (ip4_ipfix_template_packet_t *) rewrite;
+  ip = (ip4_header_t *) & tp->ip4;
+  udp = (udp_header_t *) (ip + 1);
+  h = (ipfix_message_header_t *) (udp + 1);
+  s = (ipfix_set_header_t *) (h + 1);
+  t = (ipfix_template_header_t *) (s + 1);
+  first_field = f = (ipfix_field_specifier_t *) (t + 1);
+
+  ip->ip_version_and_header_length = 0x45;
+  ip->ttl = 254;
+  ip->protocol = IP_PROTOCOL_UDP;
+  ip->src_address.as_u32 = src_address->as_u32;
+  ip->dst_address.as_u32 = collector_address->as_u32;
+  udp->src_port = clib_host_to_net_u16 (stream->src_port);
+  udp->dst_port = clib_host_to_net_u16 (collector_port);
+  udp->length = clib_host_to_net_u16 (vec_len (rewrite) - sizeof (*ip));
+
+  /* FIXUP: message header export_time */
+  h->domain_id = clib_host_to_net_u32 (stream->domain_id);
+
+  /* Add TLVs to the template */
+  if (event == NAT_ADDRESSES_EXHAUTED)
+    {
+      f->e_id_length = ipfix_e_id_length (0, observationTimeMilliseconds, 8);
+      f++;
+      f->e_id_length = ipfix_e_id_length (0, natEvent, 1);
+      f++;
+      f->e_id_length = ipfix_e_id_length (0, natPoolId, 4);
+      f++;
+    }
+  else if (event == NAT44_SESSION_CREATE)
+    {
+      f->e_id_length = ipfix_e_id_length (0, observationTimeMilliseconds, 8);
+      f++;
+      f->e_id_length = ipfix_e_id_length (0, natEvent, 1);
+      f++;
+      f->e_id_length = ipfix_e_id_length (0, sourceIPv4Address, 4);
+      f++;
+      f->e_id_length = ipfix_e_id_length (0, postNATSourceIPv4Address, 4);
+      f++;
+      f->e_id_length = ipfix_e_id_length (0, protocolIdentifier, 1);
+      f++;
+      f->e_id_length = ipfix_e_id_length (0, sourceTransportPort, 2);
+      f++;
+      f->e_id_length = ipfix_e_id_length (0, postNAPTSourceTransportPort, 2);
+      f++;
+      f->e_id_length = ipfix_e_id_length (0, ingressVRFID, 4);
+      f++;
+    }
+  else if (event == QUOTA_EXCEEDED)
+    {
+      if (quota_event == MAX_ENTRIES_PER_USER)
+        {
+          f->e_id_length = ipfix_e_id_length (0, observationTimeMilliseconds,
+                                              8);
+          f++;
+          f->e_id_length = ipfix_e_id_length (0, natEvent, 1);
+          f++;
+          f->e_id_length = ipfix_e_id_length (0, natQuotaExceededEvent, 4);
+          f++;
+          f->e_id_length = ipfix_e_id_length (0, sourceIPv4Address, 4);
+          f++;
+        }
+    }
+
+  /* Back to the template packet... */
+  ip = (ip4_header_t *) & tp->ip4;
+  udp = (udp_header_t *) (ip + 1);
+
+  ASSERT (f - first_field);
+  /* Field count in this template */
+  t->id_count = ipfix_id_count (fr->template_id, f - first_field);
+
+  /* set length in octets */
+  s->set_id_length =
+    ipfix_set_id_length (2 /* set_id */ , (u8 *) f - (u8 *) s);
+
+  /* message length in octets */
+  h->version_length = version_length ((u8 *) f - (u8 *) h);
+
+  ip->length = clib_host_to_net_u16 ((u8 *) f - (u8 *) ip);
+  ip->checksum = ip4_header_checksum (ip);
+
+  return rewrite;
+}
+
+u8 *
+snat_template_rewrite_addr_exhausted (flow_report_main_t * frm,
+                                      flow_report_t * fr,
+                                      ip4_address_t * collector_address,
+                                      ip4_address_t * src_address,
+                                      u16 collector_port)
+{
+  return snat_template_rewrite (frm, fr, collector_address, src_address,
+                                collector_port, NAT_ADDRESSES_EXHAUTED, 0);
+}
+
+u8 *
+snat_template_rewrite_nat44_session (flow_report_main_t * frm,
+                                     flow_report_t * fr,
+                                     ip4_address_t * collector_address,
+                                     ip4_address_t * src_address,
+                                     u16 collector_port)
+{
+  return snat_template_rewrite (frm, fr, collector_address, src_address,
+                                collector_port, NAT44_SESSION_CREATE, 0);
+}
+
+u8 *
+snat_template_rewrite_max_entries_per_usr (flow_report_main_t * frm,
+                                           flow_report_t * fr,
+                                           ip4_address_t * collector_address,
+                                           ip4_address_t * src_address,
+                                           u16 collector_port)
+{
+  return snat_template_rewrite (frm, fr, collector_address, src_address,
+                                collector_port, QUOTA_EXCEEDED,
+                                MAX_ENTRIES_PER_USER);
+}
+
+static inline void
+snat_ipfix_header_create (flow_report_main_t * frm,
+                          vlib_buffer_t * b0,
+                          u32 * offset)
+{
+  snat_ipfix_logging_main_t *silm = &snat_ipfix_logging_main;
+  flow_report_stream_t *stream;
+  ip4_ipfix_template_packet_t * tp;
+  ipfix_message_header_t * h = 0;
+  ipfix_set_header_t * s = 0;
+  ip4_header_t * ip;
+  udp_header_t * udp;
+
+  stream = &frm->streams[silm->stream_index];
+
+  b0->current_data = 0;
+  b0->current_length = sizeof (*ip) + sizeof (*udp) + sizeof (*h) +
+                       sizeof (*s);
+  b0->flags |= (VLIB_BUFFER_TOTAL_LENGTH_VALID | VLIB_BUFFER_FLOW_REPORT);
+  vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
+  vnet_buffer (b0)->sw_if_index[VLIB_TX] = frm->fib_index;
+  tp = vlib_buffer_get_current (b0);
+  ip = (ip4_header_t *) &tp->ip4;
+  udp = (udp_header_t *) (ip+1);
+  h = (ipfix_message_header_t *)(udp+1);
+  s = (ipfix_set_header_t *)(h+1);
+
+  ip->ip_version_and_header_length = 0x45;
+  ip->ttl = 254;
+  ip->protocol = IP_PROTOCOL_UDP;
+  ip->flags_and_fragment_offset = 0;
+  ip->src_address.as_u32 = frm->src_address.as_u32;
+  ip->dst_address.as_u32 = frm->ipfix_collector.as_u32;
+  udp->src_port = clib_host_to_net_u16 (stream->src_port);
+  udp->dst_port = clib_host_to_net_u16 (frm->collector_port);
+  udp->checksum = 0;
+
+  h->export_time = clib_host_to_net_u32 (
+    (u32) (((f64)frm->unix_time_0) + (vlib_time_now(frm->vlib_main) -
+    frm->vlib_time_0)));
+  h->sequence_number = clib_host_to_net_u32 (stream->sequence_number++);
+  h->domain_id = clib_host_to_net_u32 (stream->domain_id);
+
+  *offset = (u32) (((u8 *)(s+1)) - (u8 *)tp);
+}
+
+static inline void
+snat_ipfix_send (flow_report_main_t * frm,
+                 vlib_frame_t * f,
+                 vlib_buffer_t * b0,
+                 u16 template_id)
+{
+  ip4_ipfix_template_packet_t * tp;
+  ipfix_message_header_t * h = 0;
+  ipfix_set_header_t * s = 0;
+  ip4_header_t * ip;
+  udp_header_t * udp;
+  vlib_main_t * vm = frm->vlib_main;
+
+  tp = vlib_buffer_get_current (b0);
+  ip = (ip4_header_t *) & tp->ip4;
+  udp = (udp_header_t *) (ip + 1);
+  h = (ipfix_message_header_t *) (udp + 1);
+  s = (ipfix_set_header_t *) (h + 1);
+
+  s->set_id_length = ipfix_set_id_length (template_id,
+                                          b0->current_length -
+                                          (sizeof (*ip) + sizeof (*udp) +
+                                           sizeof (*h)));
+  h->version_length = version_length (b0->current_length -
+                                      (sizeof (*ip) + sizeof (*udp)));
+
+  ip->length = clib_host_to_net_u16 (b0->current_length);
+  ip->checksum = ip4_header_checksum (ip);
+  udp->length = clib_host_to_net_u16 (b0->current_length - sizeof (*ip));
+
+  if (frm->udp_checksum)
+    {
+      udp->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ip);
+      if (udp->checksum == 0)
+        udp->checksum = 0xffff;
+    }
+
+  ASSERT (ip->checksum == ip4_header_checksum (ip));
+
+  vlib_put_frame_to_node (vm, ip4_lookup_node.index, f);
+}
+
+static void
+snat_ipfix_logging_nat44_ses (u8 nat_event, u32 src_ip, u32 nat_src_ip,
+                              snat_protocol_t snat_proto, u16 src_port,
+                              u16 nat_src_port, u32 vrf_id, int do_flush)
+{
+  snat_ipfix_logging_main_t *silm = &snat_ipfix_logging_main;
+  flow_report_main_t *frm = &flow_report_main;
+  vlib_frame_t *f;
+  vlib_buffer_t *b0 = 0;
+  u32 bi0 = ~0;
+  u32 offset;
+  vlib_main_t * vm = frm->vlib_main;
+  u64 now;
+  vlib_buffer_free_list_t *fl;
+  u8 proto = ~0;
+
+  if (!silm->enabled)
+    return;
+
+  proto = snat_proto_to_ip_proto (snat_proto);
+
+  now = (u64) ((vlib_time_now (vm) - silm->vlib_time_0) * 1e3);
+  now += silm->milisecond_time_0;
+
+  b0 = silm->nat44_session_buffer;
+
+  if (PREDICT_FALSE (b0 == 0))
+    {
+      if (do_flush)
+        return;
+
+      if (vlib_buffer_alloc (vm, &bi0, 1) != 1)
+        {
+          clib_warning ("can't allocate buffer for NAT IPFIX event");
+          return;
+        }
+
+      b0 = silm->nat44_session_buffer =
+        vlib_get_buffer (vm, bi0);
+      fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
+      vlib_buffer_init_for_free_list (b0, fl);
+      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
+      offset = 0;
+    }
+  else
+    {
+      bi0 = vlib_get_buffer_index (vm, b0);
+      offset = silm->nat44_session_next_record_offset;
+    }
+
+  f = silm->nat44_session_frame;
+  if (PREDICT_FALSE (f == 0))
+    {
+      u32 * to_next;
+      f = vlib_get_frame_to_node (vm, ip4_lookup_node.index);
+      silm->nat44_session_frame = f;
+      to_next = vlib_frame_vector_args (f);
+      to_next[0] = bi0;
+      f->n_vectors = 1;
+    }
+
+  if (PREDICT_FALSE (offset == 0))
+    snat_ipfix_header_create (frm, b0, &offset);
+
+  if (PREDICT_TRUE (do_flush == 0))
+    {
+      u64 time_stamp = clib_host_to_net_u64 (now);
+      clib_memcpy (b0->data + offset, &time_stamp, sizeof (time_stamp));
+      offset += sizeof (time_stamp);
+
+      clib_memcpy (b0->data + offset, &nat_event, sizeof (nat_event));
+      offset += sizeof (nat_event);
+
+      clib_memcpy (b0->data + offset, &src_ip, sizeof (src_ip));
+      offset += sizeof (src_ip);
+
+      clib_memcpy (b0->data + offset, &nat_src_ip, sizeof (nat_src_ip));
+      offset += sizeof (nat_src_ip);
+
+      clib_memcpy (b0->data + offset, &proto, sizeof (proto));
+      offset += sizeof (proto);
+
+      clib_memcpy (b0->data + offset, &src_port, sizeof (src_port));
+      offset += sizeof (src_port);
+
+      clib_memcpy (b0->data + offset, &nat_src_port, sizeof (nat_src_port));
+      offset += sizeof (nat_src_port);
+
+      clib_memcpy (b0->data + offset, &vrf_id, sizeof(vrf_id));
+      offset += sizeof (vrf_id);
+
+      b0->current_length += NAT44_SESSION_CREATE_LEN;
+    }
+
+  if (PREDICT_FALSE (do_flush || (offset + NAT44_SESSION_CREATE_LEN) > frm->path_mtu))
+    {
+      snat_ipfix_send (frm, f, b0, silm->nat44_session_template_id);
+      silm->nat44_session_frame = 0;
+      silm->nat44_session_buffer = 0;
+      offset = 0;
+    }
+  silm->nat44_session_next_record_offset = offset;
+ }
+
+static void
+snat_ipfix_logging_addr_exhausted (u32 pool_id, int do_flush)
+{
+  snat_ipfix_logging_main_t *silm = &snat_ipfix_logging_main;
+  flow_report_main_t *frm = &flow_report_main;
+  vlib_frame_t *f;
+  vlib_buffer_t *b0 = 0;
+  u32 bi0 = ~0;
+  u32 offset;
+  vlib_main_t * vm = frm->vlib_main;
+  u64 now;
+  vlib_buffer_free_list_t *fl;
+  u8 nat_event = NAT_ADDRESSES_EXHAUTED;
+
+  if (!silm->enabled)
+    return;
+
+  now = (u64) ((vlib_time_now (vm) - silm->vlib_time_0) * 1e3);
+  now += silm->milisecond_time_0;
+
+  b0 = silm->addr_exhausted_buffer;
+
+  if (PREDICT_FALSE (b0 == 0))
+    {
+      if (do_flush)
+        return;
+
+      if (vlib_buffer_alloc (vm, &bi0, 1) != 1)
+        {
+          clib_warning ("can't allocate buffer for NAT IPFIX event");
+          return;
+        }
+
+      b0 = silm->addr_exhausted_buffer =
+        vlib_get_buffer (vm, bi0);
+      fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
+      vlib_buffer_init_for_free_list (b0, fl);
+      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
+      offset = 0;
+    }
+  else
+    {
+      bi0 = vlib_get_buffer_index (vm, b0);
+      offset = silm->addr_exhausted_next_record_offset;
+    }
+
+  f = silm->addr_exhausted_frame;
+  if (PREDICT_FALSE (f == 0))
+    {
+      u32 * to_next;
+      f = vlib_get_frame_to_node (vm, ip4_lookup_node.index);
+      silm->addr_exhausted_frame = f;
+      to_next = vlib_frame_vector_args (f);
+      to_next[0] = bi0;
+      f->n_vectors = 1;
+    }
+
+  if (PREDICT_FALSE (offset == 0))
+    snat_ipfix_header_create (frm, b0, &offset);
+
+  if (PREDICT_TRUE (do_flush == 0))
+    {
+      u64 time_stamp = clib_host_to_net_u64 (now);
+      clib_memcpy (b0->data + offset, &time_stamp, sizeof (time_stamp));
+      offset += sizeof (time_stamp);
+
+      clib_memcpy (b0->data + offset, &nat_event, sizeof (nat_event));
+      offset += sizeof (nat_event);
+
+      clib_memcpy (b0->data + offset, &pool_id, sizeof(pool_id));
+      offset += sizeof (pool_id);
+
+      b0->current_length += NAT_ADDRESSES_EXHAUTED_LEN;
+    }
+
+  if (PREDICT_FALSE (do_flush || (offset + NAT_ADDRESSES_EXHAUTED_LEN) > frm->path_mtu))
+    {
+      snat_ipfix_send (frm, f, b0, silm->addr_exhausted_template_id);
+      silm->addr_exhausted_frame = 0;
+      silm->addr_exhausted_buffer = 0;
+      offset = 0;
+    }
+  silm->addr_exhausted_next_record_offset = offset;
+}
+
+static void
+snat_ipfix_logging_max_entries_per_usr (u32 src_ip, int do_flush)
+{
+  snat_ipfix_logging_main_t *silm = &snat_ipfix_logging_main;
+  flow_report_main_t *frm = &flow_report_main;
+  vlib_frame_t *f;
+  vlib_buffer_t *b0 = 0;
+  u32 bi0 = ~0;
+  u32 offset;
+  vlib_main_t * vm = frm->vlib_main;
+  u64 now;
+  vlib_buffer_free_list_t *fl;
+  u8 nat_event = QUOTA_EXCEEDED;
+  u32 quota_event = MAX_ENTRIES_PER_USER;
+
+  if (!silm->enabled)
+    return;
+
+  now = (u64) ((vlib_time_now (vm) - silm->vlib_time_0) * 1e3);
+  now += silm->milisecond_time_0;
+
+  b0 = silm->max_entries_per_user_buffer;
+
+  if (PREDICT_FALSE (b0 == 0))
+    {
+      if (do_flush)
+        return;
+
+      if (vlib_buffer_alloc (vm, &bi0, 1) != 1)
+        {
+          clib_warning ("can't allocate buffer for NAT IPFIX event");
+          return;
+        }
+
+      b0 = silm->max_entries_per_user_buffer =
+        vlib_get_buffer (vm, bi0);
+      fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
+      vlib_buffer_init_for_free_list (b0, fl);
+      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
+      offset = 0;
+    }
+  else
+    {
+      bi0 = vlib_get_buffer_index (vm, b0);
+      offset = silm->max_entries_per_user_next_record_offset;
+    }
+
+  f = silm->max_entries_per_user_frame;
+  if (PREDICT_FALSE (f == 0))
+    {
+      u32 * to_next;
+      f = vlib_get_frame_to_node (vm, ip4_lookup_node.index);
+      silm->max_entries_per_user_frame = f;
+      to_next = vlib_frame_vector_args (f);
+      to_next[0] = bi0;
+      f->n_vectors = 1;
+    }
+
+  if (PREDICT_FALSE (offset == 0))
+    snat_ipfix_header_create (frm, b0, &offset);
+
+  if (PREDICT_TRUE (do_flush == 0))
+    {
+      u64 time_stamp = clib_host_to_net_u64 (now);
+      clib_memcpy (b0->data + offset, &time_stamp, sizeof (time_stamp));
+      offset += sizeof (time_stamp);
+
+      clib_memcpy (b0->data + offset, &nat_event, sizeof (nat_event));
+      offset += sizeof (nat_event);
+
+      clib_memcpy (b0->data + offset, &quota_event, sizeof(quota_event));
+      offset += sizeof (quota_event);
+
+      clib_memcpy (b0->data + offset, &src_ip, sizeof (src_ip));
+      offset += sizeof (src_ip);
+
+      b0->current_length += MAX_ENTRIES_PER_USER_LEN;
+    }
+
+  if (PREDICT_FALSE (do_flush || (offset + MAX_ENTRIES_PER_USER_LEN) > frm->path_mtu))
+    {
+      snat_ipfix_send (frm, f, b0, silm->max_entries_per_user_template_id);
+      silm->max_entries_per_user_frame = 0;
+      silm->max_entries_per_user_buffer = 0;
+      offset = 0;
+    }
+  silm->max_entries_per_user_next_record_offset = offset;
+}
+
+static void
+snat_ipfix_logging_nat44_ses_rpc_cb (snat_ipfix_logging_nat44_ses_args_t *a)
+{
+  snat_ipfix_logging_nat44_ses(a->nat_event, a->src_ip, a->nat_src_ip,
+                               a->snat_proto, a->src_port, a->nat_src_port,
+                               a->vrf_id, 0);
+}
+
+/**
+ * @brief Generate NAT44 session create event
+ *
+ * @param src_ip       source IPv4 address
+ * @param nat_src_ip   transaltes source IPv4 address
+ * @param snat_proto   NAT transport protocol
+ * @param src_port     source port
+ * @param nat_src_port translated source port
+ * @param vrf_id       VRF ID
+ */
+void
+snat_ipfix_logging_nat44_ses_create (u32 src_ip,
+                                     u32 nat_src_ip,
+                                     snat_protocol_t snat_proto,
+                                     u16 src_port,
+                                     u16 nat_src_port,
+                                     u32 vrf_id)
+{
+  snat_ipfix_logging_nat44_ses_args_t a;
+
+  a.nat_event = NAT44_SESSION_CREATE;
+  a.src_ip = src_ip;
+  a.nat_src_ip = nat_src_ip;
+  a.snat_proto = snat_proto;
+  a.src_port = src_port;
+  a.nat_src_port = nat_src_port;
+  a.vrf_id = vrf_id;
+
+  vl_api_rpc_call_main_thread (snat_ipfix_logging_nat44_ses_rpc_cb, (u8 *) &a,
+                               sizeof (a));
+}
+
+/**
+ * @brief Generate NAT44 session delete event
+ *
+ * @param src_ip       source IPv4 address
+ * @param nat_src_ip   transaltes source IPv4 address
+ * @param snat_proto   NAT transport protocol
+ * @param src_port     source port
+ * @param nat_src_port translated source port
+ * @param vrf_id       VRF ID
+ */
+void
+snat_ipfix_logging_nat44_ses_delete (u32 src_ip,
+                                     u32 nat_src_ip,
+                                     snat_protocol_t snat_proto,
+                                     u16 src_port,
+                                     u16 nat_src_port,
+                                     u32 vrf_id)
+{
+  snat_ipfix_logging_nat44_ses_args_t a;
+
+  a.nat_event = NAT44_SESSION_DELETE;
+  a.src_ip = src_ip;
+  a.nat_src_ip = nat_src_ip;
+  a.snat_proto = snat_proto;
+  a.src_port = src_port;
+  a.nat_src_port = nat_src_port;
+  a.vrf_id = vrf_id;
+
+  vl_api_rpc_call_main_thread (snat_ipfix_logging_nat44_ses_rpc_cb, (u8 *) &a,
+                               sizeof (a));
+}
+
+vlib_frame_t *
+snat_data_callback_nat44_session (flow_report_main_t * frm,
+                                  flow_report_t * fr,
+                                  vlib_frame_t * f,
+                                  u32 * to_next,
+                                  u32 node_index)
+{
+  snat_ipfix_logging_nat44_ses(0, 0, 0, 0, 0, 0, 0, 1);
+  return f;
+}
+
+static void
+snat_ipfix_logging_addr_exhausted_rpc_cb
+ (snat_ipfix_logging_addr_exhausted_args_t * a)
+{
+  snat_ipfix_logging_addr_exhausted(a->pool_id, 0);
+}
+
+/**
+ * @brief Generate NAT addresses exhausted event
+ *
+ * @param pool_id NAT pool ID
+ */
+void
+snat_ipfix_logging_addresses_exhausted(u32 pool_id)
+{
+  //TODO: This event SHOULD be rate limited
+  snat_ipfix_logging_addr_exhausted_args_t a;
+
+  a.pool_id = pool_id;
+
+  vl_api_rpc_call_main_thread (snat_ipfix_logging_addr_exhausted_rpc_cb,
+                               (u8 *) &a, sizeof (a));
+}
+
+vlib_frame_t *
+snat_data_callback_addr_exhausted (flow_report_main_t * frm,
+                                   flow_report_t * fr,
+                                   vlib_frame_t * f,
+                                   u32 * to_next,
+                                   u32 node_index)
+{
+  snat_ipfix_logging_addr_exhausted(0, 1);
+  return f;
+}
+
+static void
+snat_ipfix_logging_max_entries_per_usr_rpc_cb
+ (snat_ipfix_logging_max_entries_per_user_args_t * a)
+{
+  snat_ipfix_logging_max_entries_per_usr(a->src_ip, 0);
+}
+
+/**
+ * @brief Generate maximum entries per user exceeded event
+ *
+ * @param src_ip source IPv4 address
+ */
+void
+snat_ipfix_logging_max_entries_per_user(u32 src_ip)
+{
+  //TODO: This event SHOULD be rate limited
+  snat_ipfix_logging_max_entries_per_user_args_t a;
+
+  a.src_ip = src_ip;
+
+  vl_api_rpc_call_main_thread (snat_ipfix_logging_max_entries_per_usr_rpc_cb,
+                               (u8 *) &a, sizeof (a));
+}
+
+vlib_frame_t *
+snat_data_callback_max_entries_per_usr (flow_report_main_t * frm,
+                                        flow_report_t * fr,
+                                        vlib_frame_t * f,
+                                        u32 * to_next,
+                                        u32 node_index)
+{
+  snat_ipfix_logging_max_entries_per_usr(0, 1);
+  return f;
+}
+
+/**
+ * @brief Enable/disable NAT plugin IPFIX logging
+ *
+ * @param enable    1 if enable, 0 if disable
+ * @param domain_id observation domain ID
+ * @param src_port  source port number
+ *
+ * @returns 0 if success
+ */
+int
+snat_ipfix_logging_enable_disable (int enable, u32 domain_id, u16 src_port)
+{
+  snat_main_t * sm = &snat_main;
+  snat_ipfix_logging_main_t *silm = &snat_ipfix_logging_main;
+  flow_report_main_t *frm = &flow_report_main;
+  vnet_flow_report_add_del_args_t a;
+  int rv;
+  u8 e = enable ? 1 : 0;
+
+  if (silm->enabled == e)
+    return 0;
+
+  silm->enabled = e;
+
+  memset (&a, 0, sizeof (a));
+  a.is_add = enable;
+  a.domain_id = domain_id ? domain_id : 1;
+  a.src_port = src_port ? src_port : UDP_DST_PORT_ipfix;
+
+  if (sm->deterministic)
+    {
+      a.rewrite_callback = snat_template_rewrite_max_entries_per_usr;
+      a.flow_data_callback = snat_data_callback_max_entries_per_usr;
+
+      rv = vnet_flow_report_add_del (frm, &a, NULL);
+      if (rv)
+        {
+          clib_warning ("vnet_flow_report_add_del returned %d", rv);
+          return -1;
+        }
+    }
+  else
+    {
+      a.rewrite_callback = snat_template_rewrite_nat44_session;
+      a.flow_data_callback = snat_data_callback_nat44_session;
+
+      rv = vnet_flow_report_add_del (frm, &a, NULL);
+      if (rv)
+        {
+          clib_warning ("vnet_flow_report_add_del returned %d", rv);
+          return -1;
+        }
+
+      a.rewrite_callback = snat_template_rewrite_addr_exhausted;
+      a.flow_data_callback = snat_data_callback_addr_exhausted;
+
+      rv = vnet_flow_report_add_del (frm, &a, NULL);
+      if (rv)
+        {
+          clib_warning ("vnet_flow_report_add_del returned %d", rv);
+          return -1;
+        }
+    }
+
+  return 0;
+}
+
+/**
+ * @brief Initialize NAT plugin IPFIX logging
+ *
+ * @param vm vlib main
+ */
+void
+snat_ipfix_logging_init (vlib_main_t * vm)
+{
+  snat_ipfix_logging_main_t *silm = &snat_ipfix_logging_main;
+
+  silm->enabled = 0;
+
+  /* Set up time reference pair */
+  silm->vlib_time_0 = vlib_time_now (vm);
+  silm->milisecond_time_0 = unix_time_now_nsec () * 1e-6;
+}