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2019-12-04Trending: ReorganizationTibor Frank4-3065/+2947
+ use selection of tests by their full names + finalize trending_test_groups.md + modify static content + modify anchors + specifications: + container memif + ip4 + ip4 tunnels + ip6 + ipsec + l2 + srv6 + vhost + vts + dpdk + add 2n-clx + hyperlinks Change-Id: Ibe073330317539896c6fbfcbd4a7a279b58bdb95 Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-12-04PAL: Add HDRHistogram graphs for latencyTibor Frank5-16/+2822
Change-Id: I4d5cc369c341411a4a035dba47b945b3bf43014f Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-12-03Remove: VIRLPeter Mikus113-11978/+112
Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: I2b1672412e19f15cb46246fffa931351cd3d518b
2019-12-03Python3: PALTibor Frank23-7531/+4994
- files renamed: - utils.py --> pal_utils.py - errors.py --> pal_errors.py - functions/methods renamed: - plot_service_density_reconf_box_name --> plot_nf_reconf_box_name - plot_performance_box_name --> plot_perf_box_name - plot_latency_error_bars_name --> plot_lat_err_bars_name - plot_throughput_speedup_analysis_name --> plot_tsa_name - plot_service_density_heatmap --> plot_nf_heatmap - table_performance_comparison --> table_perf_comparison - table_performance_comparison_nic --> table_perf_comparison_nic - table_performance_trending_dashboard_html --> table_perf_trending_dash_html - functions/methods removed: - plot_service_density_heatmap_compare - plot_throughput_speedup_analysis - plot_latency_error_bars - plot_soak_boxes - plot_soak_bars Change-Id: Icddc01d3ccb451abb92b9e5d912b642d01866033 Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-12-03Python3: Vagrant updatePeter Mikus3-57/+62
+ Small styling Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: Ica8a4942b460b8534a9fbaf47bdb64dcfc9cbcde
2019-12-02Use Jumpavg 0.2.0 in PALVratko Polak8-38/+52
+ As a side effect, PAL is now part of "resource" package tree. - Testable only with 23558 (the rest of PAL Python 3 migration). Change-Id: Icbd90fd71458c07bced86f4bab9fa4e68282c38c Signed-off-by: Vratko Polak <vrpolak@cisco.com>
2019-12-02Refactor jumpavg to be more readable and usableVratko Polak3-25/+29
This is the python3 change, the python2 is still used for testing bisect. + New version is 0.2.0 due to amount o API changes. + Jumpavg is now part of CSIT resource package tree. + Perpatch migrated to new jumpavg. - PAL NOT updated (the update moved to a different Change). Change-Id: I7d7a8bf8a411196c20c2a40a8c64478d6709bc07 Signed-off-by: Vratko Polak <vrpolak@cisco.com>
2019-12-02FIX: Perpatch PY3Peter Mikus1-0/+1
Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: Iae97cf4490fea38f5f03bdaa120ee7ae48b941ab
2019-11-28Python3: resources and librariesJan Gelety17-550/+583
Change-Id: I1392c06b1d64f62b141d24c0d42a8e36913b15e2 Signed-off-by: Jan Gelety <jgelety@cisco.com>
2019-11-29Python3: PIP requirementPeter Mikus9-34/+61
- Install via PIP3 - Use virtualenv Python3 interpret Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: Iad22b344b418a1d91774d23d5ea17bfd48d394b3
2019-11-21NSH_SFC: RemoveTibor Frank6-80/+0
Change-Id: Ib7f9dff7bede4f8ec3148f234109132be920de82 Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-11-19HONEYCOMB: RemovePeter Mikus15-739/+0
Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: I60d80564050cb786c7b1e0a08f31f8292f82197e
2019-11-18FIX: Ansible remove vppPeter Mikus1-14/+2
Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: I054d2b282f67a465bb0f7ceacfe23d6283c88409
2019-11-13LIGATO: RemovePeter Mikus1-1/+0
Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: I0c9b8b07ed3a113e24a38faaddd5ed06fae67768
2019-11-13FIX: Ansible container cleanupPeter Mikus1-8/+2
Change-Id: I233baca48a3f01d1a206fd004b0503b0f1fad5d9 Signed-off-by: Peter Mikus <pmikus@cisco.com>
2019-11-13FIX: Ansible cleanup permissionPeter Mikus1-0/+2
Change-Id: Ia79558b579e70aa666e8f84230f4bd2cafb33569 Signed-off-by: Peter Mikus <pmikus@cisco.com>
2019-11-13Trending: Input dataTibor Frank1-206/+159
Change-Id: I9b1060cb6162521bfdfe4b875444dc09c109960d Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-11-11Remove the leftovers of the old testbed cleanupVratko Polak1-137/+0
Change-Id: I464db6fb6c220f23f2fe69df2c793175975d7b72 Signed-off-by: Vratko Polak <vrpolak@cisco.com>
2019-11-08FIX: Small ansible fixesPeter Mikus3-2/+2
Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: I55e0f8c28ea166464026b61e3fd2b18faf8744f2
2019-11-05Cleanup via AnsiblePeter Mikus15-759/+317
+ Remove dependency on topo_ scripts that depends on custom SSH() that depends on framework itself. This way the cleanup is independent of failure in our SSH libs. + Simple ansible command can do cleanup of a machine: ansible-playbook --inventory inventories/lf_inventory/hosts site.yaml \ --limit '10.32.8.18' --tags 'cleanup' + Add vpp_device reset and cleanup. + Remove historical scripts. - Still in testing beta phase. - Need to add SRIOV cleanup. Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: I68e23304c7ad01041f51263c328c6e8d9b555cb7
2019-11-04Trending: Fix alertsTibor Frank1-1/+1
Change-Id: I0f54bbf34493cab927408aa1da7d855ce15db061 Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-10-30Add: Use containers for shared TGPeter Mikus5-0/+102
+ Ansible + Service for auto load during restart + By default created 2 instances of Docker container + Small modification of Trex to use prefixes + DNV topology to use ssh port to connect to docker Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: Ibc2b2f0e509d920fc3e05d012b88abc388f5c3e7
2019-10-28PAL: Add sortable html table for comparisonsTibor Frank1-17/+134
Change-Id: I2d690685c5728e5f36b09d542e0f6d1a08cd151a Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-10-25ADD: Mellanox RDMA interface supportPeter Mikus1-1/+1
+ Add functions for creating rdma interface + Fix traffic generator Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: I81787b72ff5ee926ed652d350888c4f86da766f1
2019-10-18Trending: reduce input dataTibor Frank1-159/+159
Change-Id: I931c4140b3a6ced30030e4573fdd77e80987f972 Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-10-17Ansible: Role cleanupPeter Mikus26-145/+216
+ Separate and reuse role (better naming) + Cleanup in naming + Introduce defaults that can be overriden Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: Iedaf7caba1d05a35a6f61cd21a483cdbc0073d32
2019-10-16Ansible: Clean Python requirementsPeter Mikus9-122/+99
+ minor cleanup Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: Iff9c643f6e9b52dc6a11b04624452f115f3a834e
2019-10-14Ansible: Mellanox installPeter Mikus6-41/+88
+ OFED + ibdev2netdev - aligning few naming conventions Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: I0dff28b2cd4bbc4753597366d9b03b497fa336c4
2019-10-11Add: Parsing of show run over PAPIPeter Mikus1-53/+71
+ Add parsing of show run over PAPI STATS + Add missing outputs vs show run over CLI Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: I88555ff4266d41ae1d9436181aad5c324ea9dab4
2019-10-11Trending: Reorganization of tests in graphsTibor Frank1-0/+951
Change-Id: I41ddcb65d099294c5ae510b2a5f237de973e27b7 Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-10-11Trending: Generate email body for regressions and progressionsTibor Frank3-16/+52
Change-Id: Iee652fc48b574b7866d5e7f0b7b927f96de3d25f Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-10-09FIX: AnsiblePeter Mikus3-9/+9
+ Cover all CSIT devices with netplan to prevent DHCP usage + Move netplan to common role Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: Ic3790f8ff770edf64b4066f8ddb99454643f5846
2019-10-09FIX: Add SRIOV cleanupPeter Mikus1-3/+5
Signed-off-by: Peter Mikus <pmikus@cisco.com> Change-Id: I344cbab78e1491b1dc0b64598f1eae23c8d2cdcf
2019-10-07Trending: Send alerts when regression occursTibor Frank3-30/+53
Change-Id: I45d218ea323245199ad5093bd64c6a9bd862cad9 Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-10-07Report: Set the backgroud of graphsTibor Frank1-0/+12
Change-Id: Icd5f2ed496128b4cdc5f1113c778f66bbef5def3 Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-10-04FIX: Add SRIOV cleanupPeter Mikus1-11/+19
If Jenkins interrupt pybot during AVF tests (that is happening more frequently as coverage increased) the interfaces remains in link UP state. Next run VPP cannot grab interfaces as they are in UP state in and kernel driver. This results in testcase failing. Patch is supposed to do put interfaces in topology down so VPP can bind them back to vfio-pci. Change-Id: I2aa9e5944d39474965eac3c5f1b472f58e9aa8b5 Signed-off-by: Peter Mikus <pmikus@cisco.com>
2019-10-03Trending: Report also nr of passed tests in emailTibor Frank3-128/+172
Change-Id: I7ae188f5f684bd93352255d6b5c491b6d78c822c Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-10-03PAL: Set plot.ly version to 4.1.1Tibor Frank3-16/+21
Change-Id: I137ee807a2802fa1f7b5b635e1162bf7fff07a57 Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-10-02PAL: Accept reconf time in scientific notationVratko Polak1-5/+5
+ Otherwise "9.58828205237e-05" is understood as "9.58828205237". + Replace "[0-9]" with "\d". Change-Id: I7ecf6d0116fe704ecdba46f3a0e7975aba79aa62 Signed-off-by: Vratko Polak <vrpolak@cisco.com>
2019-09-27Report: Fix: Legend in reconf testsTibor Frank1-1/+1
Change-Id: I04806de7bf02af6c9b2119c45e75f8e0bc88bdd7 Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-09-26Report: Reconf tests: set autorange for y axisTibor Frank1-11/+1
Change-Id: Ie1ba26d3d76a8905698d0be33e9c5e61daff0e48 Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-09-24Add support for HDRhistogramVratko Polak3-148/+62
+ Enable hdrh in trex server. + Append hdrh coded output after min/avg/max/. + Read (not show nor decode) hdrh value in PAL. + Also, remove old ndrpdrdisc code. Change-Id: I99d99f10386a621772b5419ca1f36080fa15aca7 Signed-off-by: Vratko Polak <vrpolak@cisco.com>
2019-09-24Reconf tests: Fix async measurementsVratko Polak2-6/+32
TRex does not zero the server counters. It copies the values to use as reference, and subtracts them when asked for results. But the reference is stored in the client (not the server). And CSIT uses different scripts to start and stop async traffic, which means different clients. This patch introduces a workaround. Async start will return xstats objects to use as reference, and async stop will use the objects to compute the correct results. The xstats objects are stored in TrafficGenerator instance. Sync measurement does not export the counters, to shorten logs. Other improvements: + Make stop_traffic_on_tg return measurement results directly. + Rename --async to --async_start as "async" is reserved in Python 3.7 + Minor pylint, docstring and typo fixes. Change-Id: I5fc56a0763afb7d62cfa7c0651f96b6867de3e15 Signed-off-by: Vratko Polak <vrpolak@cisco.com>
2019-09-23PAL: Fix unit for packets lostVratko Polak1-4/+3
+ update the static content Change-Id: I8c4852195e09d7b00555ebb4a7378743c3df45f2 Signed-off-by: Vratko Polak <vrpolak@cisco.com>
2019-09-17Report: Enable pdf versionTibor Frank1-2/+2
Change-Id: I2c88a8b5939cbe4498d5bc44de3618cb717a9a7f Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-09-16Trending: Fix removing of old input filesTibor Frank1-18/+0
Change-Id: I67ff7944a1eb576bd6e739202a94eb12be9e0e1b Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-09-16Trending: Reduce input dataTibor Frank2-70/+107
Change-Id: I6b3bdac6941d85792987e2bc7e75cb8bc0be4f4a Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-09-15Report: Add dataTibor Frank1-0/+2
Change-Id: Ibef7599c5438624512d547af25b2026580e2bc92 Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-09-13Report: FixesTibor Frank2-13/+13
Change-Id: Id14704f3c1526655adeaa51f0a4198b6309a64eb Signed-off-by: Tibor Frank <tifrank@cisco.com>
2019-09-13Report: Add dataTibor Frank1-353/+438
Change-Id: I589a236919af913bb37d2db3b4079b16f1e64242 Signed-off-by: Tibor Frank <tifrank@cisco.com>
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/*
 * snat.c - simple nat plugin
 *
 * 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/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/ip4.h>
#include <vnet/plugin/plugin.h>
#include <snat/snat.h>
#include <snat/snat_ipfix_logging.h>
#include <snat/snat_det.h>
#include <snat/nat64.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/ip4_fib.h>

#include <vpp/app/version.h>

snat_main_t snat_main;


/* Hook up input features */
VNET_FEATURE_INIT (ip4_snat_in2out, static) = {
  .arc_name = "ip4-unicast",
  .node_name = "snat-in2out",
  .runs_before = VNET_FEATURES ("snat-out2in"),
};
VNET_FEATURE_INIT (ip4_snat_out2in, static) = {
  .arc_name = "ip4-unicast",
  .node_name = "snat-out2in",
  .runs_before = VNET_FEATURES ("ip4-lookup"),
};
VNET_FEATURE_INIT (ip4_snat_det_in2out, static) = {
  .arc_name = "ip4-unicast",
  .node_name = "snat-det-in2out",
  .runs_before = VNET_FEATURES ("snat-det-out2in"),
};
VNET_FEATURE_INIT (ip4_snat_det_out2in, static) = {
  .arc_name = "ip4-unicast",
  .node_name = "snat-det-out2in",
  .runs_before = VNET_FEATURES ("ip4-lookup"),
};
VNET_FEATURE_INIT (ip4_snat_in2out_worker_handoff, static) = {
  .arc_name = "ip4-unicast",
  .node_name = "snat-in2out-worker-handoff",
  .runs_before = VNET_FEATURES ("snat-out2in-worker-handoff"),
};
VNET_FEATURE_INIT (ip4_snat_out2in_worker_handoff, static) = {
  .arc_name = "ip4-unicast",
  .node_name = "snat-out2in-worker-handoff",
  .runs_before = VNET_FEATURES ("ip4-lookup"),
};
VNET_FEATURE_INIT (ip4_snat_in2out_fast, static) = {
  .arc_name = "ip4-unicast",
  .node_name = "snat-in2out-fast",
  .runs_before = VNET_FEATURES ("snat-out2in-fast"),
};
VNET_FEATURE_INIT (ip4_snat_out2in_fast, static) = {
  .arc_name = "ip4-unicast",
  .node_name = "snat-out2in-fast",
  .runs_before = VNET_FEATURES ("ip4-lookup"),
};
VNET_FEATURE_INIT (ip4_snat_hairpin_dst, static) = {
  .arc_name = "ip4-unicast",
  .node_name = "snat-hairpin-dst",
  .runs_before = VNET_FEATURES ("ip4-lookup"),
};

/* Hook up output features */
VNET_FEATURE_INIT (ip4_snat_in2out_output, static) = {
  .arc_name = "ip4-output",
  .node_name = "snat-in2out-output",
  .runs_before = VNET_FEATURES ("interface-output"),
};
VNET_FEATURE_INIT (ip4_snat_in2out_output_worker_handoff, static) = {
  .arc_name = "ip4-output",
  .node_name = "snat-in2out-output-worker-handoff",
  .runs_before = VNET_FEATURES ("interface-output"),
};
VNET_FEATURE_INIT (ip4_snat_hairpin_src, static) = {
  .arc_name = "ip4-output",
  .node_name = "snat-hairpin-src",
  .runs_before = VNET_FEATURES ("interface-output"),
};


/* *INDENT-OFF* */
VLIB_PLUGIN_REGISTER () = {
    .version = VPP_BUILD_VER,
    .description = "Network Address Translation",
};
/* *INDENT-ON* */

/**
 * @brief Add/del NAT address to FIB.
 *
 * Add the external NAT address to the FIB as receive entries. This ensures
 * that VPP will reply to ARP for this address and we don't need to enable
 * proxy ARP on the outside interface.
 *
 * @param addr IPv4 address.
 * @param plen address prefix length
 * @param sw_if_index Interface.
 * @param is_add If 0 delete, otherwise add.
 */
void
snat_add_del_addr_to_fib (ip4_address_t * addr, u8 p_len, u32 sw_if_index,
                          int is_add)
{
  fib_prefix_t prefix = {
    .fp_len = p_len,
    .fp_proto = FIB_PROTOCOL_IP4,
    .fp_addr = {
        .ip4.as_u32 = addr->as_u32,
    },
  };
  u32 fib_index = ip4_fib_table_get_index_for_sw_if_index(sw_if_index);

  if (is_add)
    fib_table_entry_update_one_path(fib_index,
                                    &prefix,
                                    FIB_SOURCE_PLUGIN_HI,
                                    (FIB_ENTRY_FLAG_CONNECTED |
                                     FIB_ENTRY_FLAG_LOCAL |
                                     FIB_ENTRY_FLAG_EXCLUSIVE),
                                    DPO_PROTO_IP4,
                                    NULL,
                                    sw_if_index,
                                    ~0,
                                    1,
                                    NULL,
                                    FIB_ROUTE_PATH_FLAG_NONE);
  else
    fib_table_entry_delete(fib_index,
                           &prefix,
                           FIB_SOURCE_PLUGIN_HI);
}

void snat_add_address (snat_main_t *sm, ip4_address_t *addr, u32 vrf_id)
{
  snat_address_t * ap;
  snat_interface_t *i;

  if (vrf_id != ~0)
    sm->vrf_mode = 1;

  /* Check if address already exists */
  vec_foreach (ap, sm->addresses)
    {
      if (ap->addr.as_u32 == addr->as_u32)
        return;
    }

  vec_add2 (sm->addresses, ap, 1);
  ap->addr = *addr;
  if (vrf_id != ~0)
    ap->fib_index =
      fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id);
  else
    ap->fib_index = ~0;
#define _(N, i, n, s) \
  clib_bitmap_alloc (ap->busy_##n##_port_bitmap, 65535);
  foreach_snat_protocol
#undef _

  /* Add external address to FIB */
  pool_foreach (i, sm->interfaces,
  ({
    if (i->is_inside)
      continue;

    snat_add_del_addr_to_fib(addr, 32, i->sw_if_index, 1);
    break;
  }));
  pool_foreach (i, sm->output_feature_interfaces,
  ({
    if (i->is_inside)
      continue;

    snat_add_del_addr_to_fib(addr, 32, i->sw_if_index, 1);
    break;
  }));
}

static int is_snat_address_used_in_static_mapping (snat_main_t *sm,
                                                   ip4_address_t addr)
{
  snat_static_mapping_t *m;
  pool_foreach (m, sm->static_mappings,
  ({
      if (m->external_addr.as_u32 == addr.as_u32)
        return 1;
  }));

  return 0;
}

void increment_v4_address (ip4_address_t * a)
{
  u32 v;
  
  v = clib_net_to_host_u32(a->as_u32) + 1;
  a->as_u32 = clib_host_to_net_u32(v);
}

static void 
snat_add_static_mapping_when_resolved (snat_main_t * sm, 
                                       ip4_address_t l_addr, 
                                       u16 l_port, 
                                       u32 sw_if_index, 
                                       u16 e_port, 
                                       u32 vrf_id,
                                       snat_protocol_t proto,
                                       int addr_only,  
                                       int is_add)
{
  snat_static_map_resolve_t *rp;

  vec_add2 (sm->to_resolve, rp, 1);
  rp->l_addr.as_u32 = l_addr.as_u32;
  rp->l_port = l_port;
  rp->sw_if_index = sw_if_index;
  rp->e_port = e_port;
  rp->vrf_id = vrf_id;
  rp->proto = proto;
  rp->addr_only = addr_only;
  rp->is_add = is_add;
}

/**
 * @brief Add static mapping.
 *
 * Create static mapping between local addr+port and external addr+port.
 *
 * @param l_addr Local IPv4 address.
 * @param e_addr External IPv4 address.
 * @param l_port Local port number.
 * @param e_port External port number.
 * @param vrf_id VRF ID.
 * @param addr_only If 0 address port and pair mapping, otherwise address only.
 * @param sw_if_index External port instead of specific IP address.
 * @param is_add If 0 delete static mapping, otherwise add.
 *
 * @returns
 */
int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
                            u16 l_port, u16 e_port, u32 vrf_id, int addr_only,
                            u32 sw_if_index, snat_protocol_t proto, int is_add)
{
  snat_main_t * sm = &snat_main;
  snat_static_mapping_t *m;
  snat_session_key_t m_key;
  clib_bihash_kv_8_8_t kv, value;
  snat_address_t *a = 0;
  u32 fib_index = ~0;
  uword * p;
  snat_interface_t *interface;
  int i;

  /* If the external address is a specific interface address */
  if (sw_if_index != ~0)
    {
      ip4_address_t * first_int_addr;

      /* Might be already set... */
      first_int_addr = ip4_interface_first_address 
        (sm->ip4_main, sw_if_index, 0 /* just want the address*/);

      /* DHCP resolution required? */
      if (first_int_addr == 0)
        {
          snat_add_static_mapping_when_resolved 
            (sm, l_addr, l_port, sw_if_index, e_port, vrf_id, proto,
             addr_only,  is_add);
          return 0;
        }
        else
          e_addr.as_u32 = first_int_addr->as_u32;
    }

  m_key.addr = e_addr;
  m_key.port = addr_only ? 0 : e_port;
  m_key.protocol = addr_only ? 0 : proto;
  m_key.fib_index = sm->outside_fib_index;
  kv.key = m_key.as_u64;
  if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
    m = 0;
  else
    m = pool_elt_at_index (sm->static_mappings, value.value);

  if (is_add)
    {
      if (m)
        return VNET_API_ERROR_VALUE_EXIST;

      /* Convert VRF id to FIB index */
      if (vrf_id != ~0)
        {
          p = hash_get (sm->ip4_main->fib_index_by_table_id, vrf_id);
          if (!p)
            return VNET_API_ERROR_NO_SUCH_FIB;
          fib_index = p[0];
        }
      /* If not specified use inside VRF id from SNAT plugin startup config */
      else
        {
          fib_index = sm->inside_fib_index;
          vrf_id = sm->inside_vrf_id;
        }

      /* Find external address in allocated addresses and reserve port for
         address and port pair mapping when dynamic translations enabled */
      if (!addr_only && !(sm->static_mapping_only))
        {
          for (i = 0; i < vec_len (sm->addresses); i++)
            {
              if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
                {
                  a = sm->addresses + i;
                  /* External port must be unused */
                  switch (proto)
                    {
#define _(N, j, n, s) \
                    case SNAT_PROTOCOL_##N: \
                      if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, e_port)) \
                        return VNET_API_ERROR_INVALID_VALUE; \
                      clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, e_port, 1); \
                      if (e_port > 1024) \
                        a->busy_##n##_ports++; \
                      break;
                      foreach_snat_protocol
#undef _
                    default:
                      clib_warning("unknown_protocol");
                      return VNET_API_ERROR_INVALID_VALUE_2;
                    }
                  break;
                }
            }
          /* External address must be allocated */
          if (!a)
            return VNET_API_ERROR_NO_SUCH_ENTRY;
        }

      pool_get (sm->static_mappings, m);
      memset (m, 0, sizeof (*m));
      m->local_addr = l_addr;
      m->external_addr = e_addr;
      m->addr_only = addr_only;
      m->vrf_id = vrf_id;
      m->fib_index = fib_index;
      if (!addr_only)
        {
          m->local_port = l_port;
          m->external_port = e_port;
          m->proto = proto;
        }

      m_key.addr = m->local_addr;
      m_key.port = m->local_port;
      m_key.protocol = m->proto;
      m_key.fib_index = m->fib_index;
      kv.key = m_key.as_u64;
      kv.value = m - sm->static_mappings;
      clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 1);

      m_key.addr = m->external_addr;
      m_key.port = m->external_port;
      m_key.fib_index = sm->outside_fib_index;
      kv.key = m_key.as_u64;
      kv.value = m - sm->static_mappings;
      clib_bihash_add_del_8_8(&sm->static_mapping_by_external, &kv, 1);

      /* Assign worker */
      if (sm->workers)
        {
          snat_user_key_t w_key0;
          snat_worker_key_t w_key1;

          w_key0.addr = m->local_addr;
          w_key0.fib_index = m->fib_index;
          kv.key = w_key0.as_u64;

          if (clib_bihash_search_8_8 (&sm->worker_by_in, &kv, &value))
            {
              kv.value = sm->first_worker_index +
                sm->workers[sm->next_worker++ % vec_len (sm->workers)];

              clib_bihash_add_del_8_8 (&sm->worker_by_in, &kv, 1);
            }
          else
            {
              kv.value = value.value;
            }

          w_key1.addr = m->external_addr;
          w_key1.port = clib_host_to_net_u16 (m->external_port);
          w_key1.fib_index = sm->outside_fib_index;
          kv.key = w_key1.as_u64;
          clib_bihash_add_del_8_8 (&sm->worker_by_out, &kv, 1);
        }
    }
  else
    {
      if (!m)
        return VNET_API_ERROR_NO_SUCH_ENTRY;

      /* Free external address port */
      if (!addr_only && !(sm->static_mapping_only))
        {
          for (i = 0; i < vec_len (sm->addresses); i++)
            {
              if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
                {
                  a = sm->addresses + i;
                  switch (proto)
                    {
#define _(N, j, n, s) \
                    case SNAT_PROTOCOL_##N: \
                      clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, e_port, 0); \
                      if (e_port > 1024) \
                        a->busy_##n##_ports--; \
                      break;
                      foreach_snat_protocol
#undef _
                    default:
                      clib_warning("unknown_protocol");
                      return VNET_API_ERROR_INVALID_VALUE_2;
                    }
                  break;
                }
            }
        }

      m_key.addr = m->local_addr;
      m_key.port = m->local_port;
      m_key.protocol = m->proto;
      m_key.fib_index = m->fib_index;
      kv.key = m_key.as_u64;
      clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 0);

      m_key.addr = m->external_addr;
      m_key.port = m->external_port;
      m_key.fib_index = sm->outside_fib_index;
      kv.key = m_key.as_u64;
      clib_bihash_add_del_8_8(&sm->static_mapping_by_external, &kv, 0);

      /* Delete session(s) for static mapping if exist */
      if (!(sm->static_mapping_only) ||
          (sm->static_mapping_only && sm->static_mapping_connection_tracking))
        {
          snat_user_key_t u_key;
          snat_user_t *u;
          dlist_elt_t * head, * elt;
          u32 elt_index, head_index, del_elt_index;
          u32 ses_index;
          u64 user_index;
          snat_session_t * s;
          snat_main_per_thread_data_t *tsm;

          u_key.addr = m->local_addr;
          u_key.fib_index = m->fib_index;
          kv.key = u_key.as_u64;
          if (!clib_bihash_search_8_8 (&sm->user_hash, &kv, &value))
            {
              user_index = value.value;
              if (!clib_bihash_search_8_8 (&sm->worker_by_in, &kv, &value))
                tsm = vec_elt_at_index (sm->per_thread_data, value.value);
              else
                tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
              u = pool_elt_at_index (tsm->users, user_index);
              if (u->nstaticsessions)
                {
                  head_index = u->sessions_per_user_list_head_index;
                  head = pool_elt_at_index (tsm->list_pool, head_index);
                  elt_index = head->next;
                  elt = pool_elt_at_index (tsm->list_pool, elt_index);
                  ses_index = elt->value;
                  while (ses_index != ~0)
                    {
                      s =  pool_elt_at_index (tsm->sessions, ses_index);
                      del_elt_index = elt_index;
                      elt_index = elt->next;
                      elt = pool_elt_at_index (tsm->list_pool, elt_index);
                      ses_index = elt->value;

                      if (!addr_only)
                        {
                          if ((s->out2in.addr.as_u32 != e_addr.as_u32) &&
                              (clib_net_to_host_u16 (s->out2in.port) != e_port))
                            continue;
                        }

                      if (snat_is_unk_proto_session (s))
                        {
                          clib_bihash_kv_16_8_t up_kv;
                          snat_unk_proto_ses_key_t up_key;
                          up_key.l_addr = s->in2out.addr;
                          up_key.r_addr = s->ext_host_addr;
                          up_key.fib_index = s->in2out.fib_index;
                          up_key.proto = s->in2out.port;
                          up_key.rsvd[0] = up_key.rsvd[1] = up_key.rsvd[2] = 0;
                          up_kv.key[0] = up_key.as_u64[0];
                          up_kv.key[1] = up_key.as_u64[1];
                          if (clib_bihash_add_del_16_8 (&sm->in2out_unk_proto,
                                                        &up_kv, 0))
                            clib_warning ("in2out key del failed");

                          up_key.l_addr = s->out2in.addr;
                          up_key.fib_index = s->out2in.fib_index;
                          up_kv.key[0] = up_key.as_u64[0];
                          up_kv.key[1] = up_key.as_u64[1];
                          if (clib_bihash_add_del_16_8 (&sm->out2in_unk_proto,
                                                        &up_kv, 0))
                            clib_warning ("out2in key del failed");

                          goto delete;
                        }
                      /* log NAT event */
                      snat_ipfix_logging_nat44_ses_delete(s->in2out.addr.as_u32,
                                                          s->out2in.addr.as_u32,
                                                          s->in2out.protocol,
                                                          s->in2out.port,
                                                          s->out2in.port,
                                                          s->in2out.fib_index);

                      value.key = s->in2out.as_u64;
                      if (clib_bihash_add_del_8_8 (&sm->in2out, &value, 0))
                        clib_warning ("in2out key del failed");
                      value.key = s->out2in.as_u64;
                      if (clib_bihash_add_del_8_8 (&sm->out2in, &value, 0))
                        clib_warning ("out2in key del failed");
delete:
                      pool_put (tsm->sessions, s);

                      clib_dlist_remove (tsm->list_pool, del_elt_index);
                      pool_put_index (tsm->list_pool, del_elt_index);
                      u->nstaticsessions--;

                      if (!addr_only)
                        break;
                    }
                  if (addr_only)
                    {
                      pool_put (tsm->users, u);
                      clib_bihash_add_del_8_8 (&sm->user_hash, &kv, 0);
                    }
                }
            }
        }

      /* Delete static mapping from pool */
      pool_put (sm->static_mappings, m);
    }

  if (!addr_only)
    return 0;

  /* Add/delete external address to FIB */
  pool_foreach (interface, sm->interfaces,
  ({
    if (interface->is_inside)
      continue;

    snat_add_del_addr_to_fib(&e_addr, 32, interface->sw_if_index, is_add);
    break;
  }));
  pool_foreach (interface, sm->output_feature_interfaces,
  ({
    if (interface->is_inside)
      continue;

    snat_add_del_addr_to_fib(&e_addr, 32, interface->sw_if_index, is_add);
    break;
  }));

  return 0;
}

int snat_del_address (snat_main_t *sm, ip4_address_t addr, u8 delete_sm)
{
  snat_address_t *a = 0;
  snat_session_t *ses;
  u32 *ses_to_be_removed = 0, *ses_index;
  clib_bihash_kv_8_8_t kv, value;
  snat_user_key_t user_key;
  snat_user_t *u;
  snat_main_per_thread_data_t *tsm;
  snat_static_mapping_t *m;
  snat_interface_t *interface;
  int i;

  /* Find SNAT address */
  for (i=0; i < vec_len (sm->addresses); i++)
    {
      if (sm->addresses[i].addr.as_u32 == addr.as_u32)
        {
          a = sm->addresses + i;
          break;
        }
    }
  if (!a)
    return VNET_API_ERROR_NO_SUCH_ENTRY;

  if (delete_sm)
    {
      pool_foreach (m, sm->static_mappings,
      ({
          if (m->external_addr.as_u32 == addr.as_u32)
            (void) snat_add_static_mapping (m->local_addr, m->external_addr,
                                            m->local_port, m->external_port,
                                            m->vrf_id, m->addr_only, ~0,
                                            m->proto, 0);
      }));
    }
  else
    {
      /* Check if address is used in some static mapping */
      if (is_snat_address_used_in_static_mapping(sm, addr))
        {
          clib_warning ("address used in static mapping");
          return VNET_API_ERROR_UNSPECIFIED;
        }
    }

  if (a->fib_index != ~0)
    fib_table_unlock(a->fib_index, FIB_PROTOCOL_IP4);

  /* Delete sessions using address */
  if (a->busy_tcp_ports || a->busy_udp_ports || a->busy_icmp_ports)
    {
      vec_foreach (tsm, sm->per_thread_data)
        {
          pool_foreach (ses, tsm->sessions, ({
            if (ses->out2in.addr.as_u32 == addr.as_u32)
              {
                if (snat_is_unk_proto_session (ses))
                  {
                    clib_bihash_kv_16_8_t up_kv;
                    snat_unk_proto_ses_key_t up_key;
                    up_key.l_addr = ses->in2out.addr;
                    up_key.r_addr = ses->ext_host_addr;
                    up_key.fib_index = ses->in2out.fib_index;
                    up_key.proto = ses->in2out.port;
                    up_key.rsvd[0] = up_key.rsvd[1] = up_key.rsvd[2] = 0;
                    up_kv.key[0] = up_key.as_u64[0];
                    up_kv.key[1] = up_key.as_u64[1];
                    if (clib_bihash_add_del_16_8 (&sm->in2out_unk_proto,
                                                  &up_kv, 0))
                      clib_warning ("in2out key del failed");

                    up_key.l_addr = ses->out2in.addr;
                    up_key.fib_index = ses->out2in.fib_index;
                    up_kv.key[0] = up_key.as_u64[0];
                    up_kv.key[1] = up_key.as_u64[1];
                    if (clib_bihash_add_del_16_8 (&sm->out2in_unk_proto,
                                                  &up_kv, 0))
                      clib_warning ("out2in key del failed");
                  }
                else
                  {
                    /* log NAT event */
                    snat_ipfix_logging_nat44_ses_delete(ses->in2out.addr.as_u32,
                                                        ses->out2in.addr.as_u32,
                                                        ses->in2out.protocol,
                                                        ses->in2out.port,
                                                        ses->out2in.port,
                                                        ses->in2out.fib_index);
                    kv.key = ses->in2out.as_u64;
                    clib_bihash_add_del_8_8 (&sm->in2out, &kv, 0);
                    kv.key = ses->out2in.as_u64;
                    clib_bihash_add_del_8_8 (&sm->out2in, &kv, 0);
                  }
                vec_add1 (ses_to_be_removed, ses - tsm->sessions);
                clib_dlist_remove (tsm->list_pool, ses->per_user_index);
                user_key.addr = ses->in2out.addr;
                user_key.fib_index = ses->in2out.fib_index;
                kv.key = user_key.as_u64;
                if (!clib_bihash_search_8_8 (&sm->user_hash, &kv, &value))
                  {
                    u = pool_elt_at_index (tsm->users, value.value);
                    u->nsessions--;
                  }
              }
          }));

          vec_foreach (ses_index, ses_to_be_removed)
            pool_put_index (tsm->sessions, ses_index[0]);

          vec_free (ses_to_be_removed);
       }
    }

  vec_del1 (sm->addresses, i);

  /* Delete external address from FIB */
  pool_foreach (interface, sm->interfaces,
  ({
    if (interface->is_inside)
      continue;

    snat_add_del_addr_to_fib(&addr, 32, interface->sw_if_index, 0);
    break;
  }));
  pool_foreach (interface, sm->output_feature_interfaces,
  ({
    if (interface->is_inside)
      continue;

    snat_add_del_addr_to_fib(&addr, 32, interface->sw_if_index, 0);
    break;
  }));

  return 0;
}

int snat_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del)
{
  snat_main_t *sm = &snat_main;
  snat_interface_t *i;
  const char * feature_name;
  snat_address_t * ap;
  snat_static_mapping_t * m;
  snat_det_map_t * dm;

  if (sm->static_mapping_only && !(sm->static_mapping_connection_tracking))
    feature_name = is_inside ?  "snat-in2out-fast" : "snat-out2in-fast";
  else
    {
      if (sm->num_workers > 1 && !sm->deterministic)
        feature_name = is_inside ?  "snat-in2out-worker-handoff" : "snat-out2in-worker-handoff";
      else if (sm->deterministic)
        feature_name = is_inside ?  "snat-det-in2out" : "snat-det-out2in";
      else
        feature_name = is_inside ?  "snat-in2out" : "snat-out2in";
    }

  vnet_feature_enable_disable ("ip4-unicast", feature_name, sw_if_index,
			       !is_del, 0, 0);

  if (sm->fq_in2out_index == ~0 && !sm->deterministic && sm->num_workers > 1)
    sm->fq_in2out_index = vlib_frame_queue_main_init (sm->in2out_node_index, 0);

  if (sm->fq_out2in_index == ~0 && !sm->deterministic && sm->num_workers > 1)
    sm->fq_out2in_index = vlib_frame_queue_main_init (sm->out2in_node_index, 0);

  pool_foreach (i, sm->interfaces,
  ({
    if (i->sw_if_index == sw_if_index)
      {
        if (is_del)
          pool_put (sm->interfaces, i);
        else
          return VNET_API_ERROR_VALUE_EXIST;

        goto fib;
      }
  }));

  if (is_del)
    return VNET_API_ERROR_NO_SUCH_ENTRY;

  pool_get (sm->interfaces, i);
  i->sw_if_index = sw_if_index;
  i->is_inside = is_inside;

  /* Add/delete external addresses to FIB */
fib:
  if (is_inside)
    return 0;

  vec_foreach (ap, sm->addresses)
    snat_add_del_addr_to_fib(&ap->addr, 32, sw_if_index, !is_del);

  pool_foreach (m, sm->static_mappings,
  ({
    if (!(m->addr_only))
      continue;

    snat_add_del_addr_to_fib(&m->external_addr, 32, sw_if_index, !is_del);
  }));

  pool_foreach (dm, sm->det_maps,
  ({
    snat_add_del_addr_to_fib(&dm->out_addr, dm->out_plen, sw_if_index, !is_del);
  }));

  return 0;
}

int snat_interface_add_del_output_feature (u32 sw_if_index,
                                           u8 is_inside,
                                           int is_del)
{
  snat_main_t *sm = &snat_main;
  snat_interface_t *i;
  snat_address_t * ap;
  snat_static_mapping_t * m;

  if (sm->deterministic ||
      (sm->static_mapping_only && !(sm->static_mapping_connection_tracking)))
    return VNET_API_ERROR_UNSUPPORTED;

  if (is_inside)
    {
      vnet_feature_enable_disable ("ip4-unicast", "snat-hairpin-dst",
                                   sw_if_index, !is_del, 0, 0);
      vnet_feature_enable_disable ("ip4-output", "snat-hairpin-src",
                                   sw_if_index, !is_del, 0, 0);
      goto fq;
    }

  if (sm->num_workers > 1)
    {
      vnet_feature_enable_disable ("ip4-unicast", "snat-out2in-worker-handoff",
                                   sw_if_index, !is_del, 0, 0);
      vnet_feature_enable_disable ("ip4-output",
                                   "snat-in2out-output-worker-handoff",
                                   sw_if_index, !is_del, 0, 0);
    }
  else
    {
      vnet_feature_enable_disable ("ip4-unicast", "snat-out2in", sw_if_index,
                                   !is_del, 0, 0);
      vnet_feature_enable_disable ("ip4-output", "snat-in2out-output",
                                   sw_if_index, !is_del, 0, 0);
    }

fq:
  if (sm->fq_in2out_output_index == ~0 && sm->num_workers > 1)
    sm->fq_in2out_output_index =
      vlib_frame_queue_main_init (sm->in2out_output_node_index, 0);

  if (sm->fq_out2in_index == ~0 && sm->num_workers > 1)
    sm->fq_out2in_index = vlib_frame_queue_main_init (sm->out2in_node_index, 0);

  pool_foreach (i, sm->output_feature_interfaces,
  ({
    if (i->sw_if_index == sw_if_index)
      {
        if (is_del)
          pool_put (sm->output_feature_interfaces, i);
        else
          return VNET_API_ERROR_VALUE_EXIST;

        goto fib;
      }
  }));

  if (is_del)
    return VNET_API_ERROR_NO_SUCH_ENTRY;

  pool_get (sm->output_feature_interfaces, i);
  i->sw_if_index = sw_if_index;
  i->is_inside = is_inside;

  /* Add/delete external addresses to FIB */
fib:
  if (is_inside)
    return 0;

  vec_foreach (ap, sm->addresses)
    snat_add_del_addr_to_fib(&ap->addr, 32, sw_if_index, !is_del);

  pool_foreach (m, sm->static_mappings,
  ({
    if (!(m->addr_only))
      continue;

    snat_add_del_addr_to_fib(&m->external_addr, 32, sw_if_index, !is_del);
  }));

  return 0;
}

int snat_set_workers (uword * bitmap)
{
  snat_main_t *sm = &snat_main;
  int i, j = 0;

  if (sm->num_workers < 2)
    return VNET_API_ERROR_FEATURE_DISABLED;

  if (clib_bitmap_last_set (bitmap) >= sm->num_workers)
    return VNET_API_ERROR_INVALID_WORKER;

  vec_free (sm->workers);
  clib_bitmap_foreach (i, bitmap,
    ({
      vec_add1(sm->workers, i);
      sm->per_thread_data[i].snat_thread_index = j;
      j++;
    }));

  sm->port_per_thread = (0xffff - 1024) / _vec_len (sm->workers);
  sm->num_snat_thread = _vec_len (sm->workers);

  return 0;
}


static void
snat_ip4_add_del_interface_address_cb (ip4_main_t * im,
                                       uword opaque,
                                       u32 sw_if_index,
                                       ip4_address_t * address,
                                       u32 address_length,
                                       u32 if_address_index,
                                       u32 is_delete);

static clib_error_t * snat_init (vlib_main_t * vm)
{
  snat_main_t * sm = &snat_main;
  clib_error_t * error = 0;
  ip4_main_t * im = &ip4_main;
  ip_lookup_main_t * lm = &im->lookup_main;
  uword *p;
  vlib_thread_registration_t *tr;
  vlib_thread_main_t *tm = vlib_get_thread_main ();
  uword *bitmap = 0;
  u32 i;
  ip4_add_del_interface_address_callback_t cb4;

  sm->vlib_main = vm;
  sm->vnet_main = vnet_get_main();
  sm->ip4_main = im;
  sm->ip4_lookup_main = lm;
  sm->api_main = &api_main;
  sm->first_worker_index = 0;
  sm->next_worker = 0;
  sm->num_workers = 0;
  sm->num_snat_thread = 1;
  sm->workers = 0;
  sm->port_per_thread = 0xffff - 1024;
  sm->fq_in2out_index = ~0;
  sm->fq_out2in_index = ~0;
  sm->udp_timeout = SNAT_UDP_TIMEOUT;
  sm->tcp_established_timeout = SNAT_TCP_ESTABLISHED_TIMEOUT;
  sm->tcp_transitory_timeout = SNAT_TCP_TRANSITORY_TIMEOUT;
  sm->icmp_timeout = SNAT_ICMP_TIMEOUT;

  p = hash_get_mem (tm->thread_registrations_by_name, "workers");
  if (p)
    {
      tr = (vlib_thread_registration_t *) p[0];
      if (tr)
        {
          sm->num_workers = tr->count;
          sm->first_worker_index = tr->first_index;
        }
    }

  vec_validate (sm->per_thread_data, tm->n_vlib_mains - 1);

  /* Use all available workers by default */
  if (sm->num_workers > 1)
    {
      for (i=0; i < sm->num_workers; i++)
        bitmap = clib_bitmap_set (bitmap, i, 1);
      snat_set_workers(bitmap);
      clib_bitmap_free (bitmap);
    }
  else
    {
      sm->per_thread_data[0].snat_thread_index = 0;
    }

  error = snat_api_init(vm, sm);
  if (error)
    return error;

  /* Set up the interface address add/del callback */
  cb4.function = snat_ip4_add_del_interface_address_cb;
  cb4.function_opaque = 0;

  vec_add1 (im->add_del_interface_address_callbacks, cb4);

  /* Init IPFIX logging */
  snat_ipfix_logging_init(vm);

  error = nat64_init(vm);

  return error;
}

VLIB_INIT_FUNCTION (snat_init);

void snat_free_outside_address_and_port (snat_main_t * sm, 
                                         snat_session_key_t * k, 
                                         u32 address_index)
{
  snat_address_t *a;
  u16 port_host_byte_order = clib_net_to_host_u16 (k->port);
  
  ASSERT (address_index < vec_len (sm->addresses));

  a = sm->addresses + address_index;

  switch (k->protocol)
    {
#define _(N, i, n, s) \
    case SNAT_PROTOCOL_##N: \
      ASSERT (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, \
        port_host_byte_order) == 1); \
      clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, \
        port_host_byte_order, 0); \
      a->busy_##n##_ports--; \
      break;
      foreach_snat_protocol
#undef _
    default:
      clib_warning("unknown_protocol");
      return;
    }
}  

/**
 * @brief Match SNAT static mapping.
 *
 * @param sm          SNAT main.
 * @param match       Address and port to match.
 * @param mapping     External or local address and port of the matched mapping.
 * @param by_external If 0 match by local address otherwise match by external
 *                    address.
 * @param is_addr_only If matched mapping is address only
 *
 * @returns 0 if match found otherwise 1.
 */
int snat_static_mapping_match (snat_main_t * sm,
                               snat_session_key_t match,
                               snat_session_key_t * mapping,
                               u8 by_external,
                               u8 *is_addr_only)
{
  clib_bihash_kv_8_8_t kv, value;
  snat_static_mapping_t *m;
  snat_session_key_t m_key;
  clib_bihash_8_8_t *mapping_hash = &sm->static_mapping_by_local;

  if (by_external)
    mapping_hash = &sm->static_mapping_by_external;

  m_key.addr = match.addr;
  m_key.port = clib_net_to_host_u16 (match.port);
  m_key.protocol = match.protocol;
  m_key.fib_index = match.fib_index;

  kv.key = m_key.as_u64;

  if (clib_bihash_search_8_8 (mapping_hash, &kv, &value))
    {
      /* Try address only mapping */
      m_key.port = 0;
      m_key.protocol = 0;
      kv.key = m_key.as_u64;
      if (clib_bihash_search_8_8 (mapping_hash, &kv, &value))
        return 1;
    }

  m = pool_elt_at_index (sm->static_mappings, value.value);

  if (by_external)
    {
      mapping->addr = m->local_addr;
      /* Address only mapping doesn't change port */
      mapping->port = m->addr_only ? match.port
        : clib_host_to_net_u16 (m->local_port);
      mapping->fib_index = m->fib_index;
    }
  else
    {
      mapping->addr = m->external_addr;
      /* Address only mapping doesn't change port */
      mapping->port = m->addr_only ? match.port
        : clib_host_to_net_u16 (m->external_port);
      mapping->fib_index = sm->outside_fib_index;
    }

  if (PREDICT_FALSE(is_addr_only != 0))
    *is_addr_only = m->addr_only;

  return 0;
}

static_always_inline u16
snat_random_port (snat_main_t * sm, u16 min, u16 max)
{
  return min + random_u32 (&sm->random_seed) /
    (random_u32_max() / (max - min + 1) + 1);
}

int snat_alloc_outside_address_and_port (snat_main_t * sm,
                                         u32 fib_index,
                                         u32 thread_index,
                                         snat_session_key_t * k,
                                         u32 * address_indexp)
{
  int i;
  snat_address_t *a;
  u32 portnum;

  for (i = 0; i < vec_len (sm->addresses); i++)
    {
      a = sm->addresses + i;
      if (sm->vrf_mode && a->fib_index != ~0 && a->fib_index != fib_index)
        continue;
      switch (k->protocol)
        {
#define _(N, j, n, s) \
        case SNAT_PROTOCOL_##N: \
          if (a->busy_##n##_ports < (sm->port_per_thread * sm->num_snat_thread)) \
            { \
              while (1) \
                { \
                  portnum = (sm->port_per_thread * \
                    sm->per_thread_data[thread_index].snat_thread_index) + \
                    snat_random_port(sm, 0, sm->port_per_thread) + 1024; \
                  if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, portnum)) \
                    continue; \
                  clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, portnum, 1); \
                  a->busy_##n##_ports++; \
                  k->addr = a->addr; \
                  k->port = clib_host_to_net_u16(portnum); \
                  *address_indexp = i; \
                  return 0; \
                } \
            } \
          break;
          foreach_snat_protocol
#undef _
        default:
          clib_warning("unknown protocol");
          return 1;
        }

    }
  /* Totally out of translations to use... */
  snat_ipfix_logging_addresses_exhausted(0);
  return 1;
}


static clib_error_t *
add_address_command_fn (vlib_main_t * vm,
                        unformat_input_t * input,
                        vlib_cli_command_t * cmd)
{
  unformat_input_t _line_input, *line_input = &_line_input;
  snat_main_t * sm = &snat_main;
  ip4_address_t start_addr, end_addr, this_addr;
  u32 start_host_order, end_host_order;
  u32 vrf_id = ~0;
  int i, count;
  int is_add = 1;
  int rv = 0;
  clib_error_t *error = 0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "%U - %U",
                    unformat_ip4_address, &start_addr,
                    unformat_ip4_address, &end_addr))
        ;
      else if (unformat (line_input, "tenant-vrf %u", &vrf_id))
        ;
      else if (unformat (line_input, "%U", unformat_ip4_address, &start_addr))
        end_addr = start_addr;
      else if (unformat (line_input, "del"))
        is_add = 0;
      else
        {
          error = clib_error_return (0, "unknown input '%U'",
            format_unformat_error, line_input);
          goto done;
        }
     }

  if (sm->static_mapping_only)
    {
      error = clib_error_return (0, "static mapping only mode");
      goto done;
    }

  start_host_order = clib_host_to_net_u32 (start_addr.as_u32);
  end_host_order = clib_host_to_net_u32 (end_addr.as_u32);
  
  if (end_host_order < start_host_order)
    {
      error = clib_error_return (0, "end address less than start address");
      goto done;
    }

  count = (end_host_order - start_host_order) + 1;

  if (count > 1024)
    clib_warning ("%U - %U, %d addresses...",
                  format_ip4_address, &start_addr,
                  format_ip4_address, &end_addr,
                  count);
  
  this_addr = start_addr;

  for (i = 0; i < count; i++)
    {
      if (is_add)
        snat_add_address (sm, &this_addr, vrf_id);
      else
        rv = snat_del_address (sm, this_addr, 0);

      switch (rv)
        {
        case VNET_API_ERROR_NO_SUCH_ENTRY:
          error = clib_error_return (0, "S-NAT address not exist.");
          goto done;
        case VNET_API_ERROR_UNSPECIFIED:
          error = clib_error_return (0, "S-NAT address used in static mapping.");
          goto done;
        default:
          break;
        }

      increment_v4_address (&this_addr);
    }

done:
  unformat_free (line_input);

  return error;
}

VLIB_CLI_COMMAND (add_address_command, static) = {
  .path = "snat add address",
  .short_help = "snat add addresses <ip4-range-start> [- <ip4-range-end>] "
                "[tenant-vrf <vrf-id>] [del]",
  .function = add_address_command_fn,
};

static clib_error_t *
snat_feature_command_fn (vlib_main_t * vm,
                          unformat_input_t * input,
                          vlib_cli_command_t * cmd)
{
  unformat_input_t _line_input, *line_input = &_line_input;
  vnet_main_t * vnm = vnet_get_main();
  clib_error_t * error = 0;
  u32 sw_if_index;
  u32 * inside_sw_if_indices = 0;
  u32 * outside_sw_if_indices = 0;
  u8 is_output_feature = 0;
  int is_del = 0;
  int i;

  sw_if_index = ~0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "in %U", unformat_vnet_sw_interface,
                    vnm, &sw_if_index))
        vec_add1 (inside_sw_if_indices, sw_if_index);
      else if (unformat (line_input, "out %U", unformat_vnet_sw_interface,
                         vnm, &sw_if_index))
        vec_add1 (outside_sw_if_indices, sw_if_index);
      else if (unformat (line_input, "output-feature"))
        is_output_feature = 1;
      else if (unformat (line_input, "del"))
        is_del = 1;
      else
        {
          error = clib_error_return (0, "unknown input '%U'",
            format_unformat_error, line_input);
          goto done;
        }
    }

  if (vec_len (inside_sw_if_indices))
    {
      for (i = 0; i < vec_len(inside_sw_if_indices); i++)
        {
          sw_if_index = inside_sw_if_indices[i];
          if (is_output_feature)
            {
              if (snat_interface_add_del_output_feature (sw_if_index, 1, is_del))
                {
                  error = clib_error_return (0, "%s %U failed",
                                             is_del ? "del" : "add",
                                             format_vnet_sw_interface_name, vnm,
                                             vnet_get_sw_interface (vnm,
                                                                    sw_if_index));
                  goto done;
                }
            }
          else
            {
              if (snat_interface_add_del (sw_if_index, 1, is_del))
                {
                  error = clib_error_return (0, "%s %U failed",
                                             is_del ? "del" : "add",
                                             format_vnet_sw_interface_name, vnm,
                                             vnet_get_sw_interface (vnm,
                                                                    sw_if_index));
                  goto done;
                }
            }
        }
    }

  if (vec_len (outside_sw_if_indices))
    {
      for (i = 0; i < vec_len(outside_sw_if_indices); i++)
        {
          sw_if_index = outside_sw_if_indices[i];
          if (is_output_feature)
            {
              if (snat_interface_add_del_output_feature (sw_if_index, 0, is_del))
                {
                  error = clib_error_return (0, "%s %U failed",
                                             is_del ? "del" : "add",
                                             format_vnet_sw_interface_name, vnm,
                                             vnet_get_sw_interface (vnm,
                                                                    sw_if_index));
                  goto done;
                }
            }
          else
            {
              if (snat_interface_add_del (sw_if_index, 0, is_del))
                {
                  error = clib_error_return (0, "%s %U failed",
                                             is_del ? "del" : "add",
                                             format_vnet_sw_interface_name, vnm,
                                             vnet_get_sw_interface (vnm,
                                                                    sw_if_index));
                  goto done;
                }
            }
        }
    }

done:
  unformat_free (line_input);
  vec_free (inside_sw_if_indices);
  vec_free (outside_sw_if_indices);

  return error;
}

VLIB_CLI_COMMAND (set_interface_snat_command, static) = {
  .path = "set interface snat",
  .function = snat_feature_command_fn,
  .short_help = "set interface snat in <intfc> out <intfc> [output-feature] "
                "[del]",
};

uword
unformat_snat_protocol (unformat_input_t * input, va_list * args)
{
  u32 *r = va_arg (*args, u32 *);

  if (0);
#define _(N, i, n, s) else if (unformat (input, s)) *r = SNAT_PROTOCOL_##N;
  foreach_snat_protocol
#undef _
  else
    return 0;
  return 1;
}

u8 *
format_snat_protocol (u8 * s, va_list * args)
{
  u32 i = va_arg (*args, u32);
  u8 *t = 0;

  switch (i)
    {
#define _(N, j, n, str) case SNAT_PROTOCOL_##N: t = (u8 *) str; break;
      foreach_snat_protocol
#undef _
    default:
      s = format (s, "unknown");
      return s;
    }
  s = format (s, "%s", t);
  return s;
}

static clib_error_t *
add_static_mapping_command_fn (vlib_main_t * vm,
                               unformat_input_t * input,
                               vlib_cli_command_t * cmd)
{
  unformat_input_t _line_input, *line_input = &_line_input;
  clib_error_t * error = 0;
  ip4_address_t l_addr, e_addr;
  u32 l_port = 0, e_port = 0, vrf_id = ~0;
  int is_add = 1;
  int addr_only = 1;
  u32 sw_if_index = ~0;
  vnet_main_t * vnm = vnet_get_main();
  int rv;
  snat_protocol_t proto;
  u8 proto_set = 0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "local %U %u", unformat_ip4_address, &l_addr,
                    &l_port))
        addr_only = 0;
      else if (unformat (line_input, "local %U", unformat_ip4_address, &l_addr))
        ;
      else if (unformat (line_input, "external %U %u", unformat_ip4_address,
                         &e_addr, &e_port))
        addr_only = 0;
      else if (unformat (line_input, "external %U", unformat_ip4_address,
                         &e_addr))
        ;
      else if (unformat (line_input, "external %U %u",
                         unformat_vnet_sw_interface, vnm, &sw_if_index,
                         &e_port))
        addr_only = 0;

      else if (unformat (line_input, "external %U",
                         unformat_vnet_sw_interface, vnm, &sw_if_index))
        ;
      else if (unformat (line_input, "vrf %u", &vrf_id))
        ;
      else if (unformat (line_input, "%U", unformat_snat_protocol, &proto))
        proto_set = 1;
      else if (unformat (line_input, "del"))
        is_add = 0;
      else
        {
          error = clib_error_return (0, "unknown input: '%U'",
            format_unformat_error, line_input);
          goto done;
        }
    }

  if (!addr_only && !proto_set)
    {
      error = clib_error_return (0, "missing protocol");
      goto done;
    }

  rv = snat_add_static_mapping(l_addr, e_addr, (u16) l_port, (u16) e_port,
                               vrf_id, addr_only, sw_if_index, proto, is_add);

  switch (rv)
    {
    case VNET_API_ERROR_INVALID_VALUE:
      error = clib_error_return (0, "External port already in use.");
      goto done;
    case VNET_API_ERROR_NO_SUCH_ENTRY:
      if (is_add)
        error = clib_error_return (0, "External addres must be allocated.");
      else
        error = clib_error_return (0, "Mapping not exist.");
      goto done;
    case VNET_API_ERROR_NO_SUCH_FIB:
      error = clib_error_return (0, "No such VRF id.");
      goto done;
    case VNET_API_ERROR_VALUE_EXIST:
      error = clib_error_return (0, "Mapping already exist.");
      goto done;
    default:
      break;
    }

done:
  unformat_free (line_input);

  return error;
}

/*?
 * @cliexpar
 * @cliexstart{snat add static mapping}
 * Static mapping allows hosts on the external network to initiate connection
 * to to the local network host.
 * To create static mapping between local host address 10.0.0.3 port 6303 and
 * external address 4.4.4.4 port 3606 for TCP protocol use:
 *  vpp# snat add static mapping local tcp 10.0.0.3 6303 external 4.4.4.4 3606
 * If not runnig "static mapping only" S-NAT plugin mode use before:
 *  vpp# snat add address 4.4.4.4
 * To create static mapping between local and external address use:
 *  vpp# snat add static mapping local 10.0.0.3 external 4.4.4.4
 * @cliexend
?*/
VLIB_CLI_COMMAND (add_static_mapping_command, static) = {
  .path = "snat add static mapping",
  .function = add_static_mapping_command_fn,
  .short_help =
    "snat add static mapping local tcp|udp|icmp <addr> [<port>] external <addr> [<port>] [vrf <table-id>] [del]",
};

static clib_error_t *
set_workers_command_fn (vlib_main_t * vm,
                        unformat_input_t * input,
                        vlib_cli_command_t * cmd)
{
  unformat_input_t _line_input, *line_input = &_line_input;
  uword *bitmap = 0;
  int rv = 0;
  clib_error_t *error = 0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "%U", unformat_bitmap_list, &bitmap))
        ;
      else
        {
          error = clib_error_return (0, "unknown input '%U'",
            format_unformat_error, line_input);
          goto done;
        }
     }

  if (bitmap == 0)
    {
      error = clib_error_return (0, "List of workers must be specified.");
      goto done;
    }

  rv = snat_set_workers(bitmap);

  clib_bitmap_free (bitmap);

  switch (rv)
    {
    case VNET_API_ERROR_INVALID_WORKER:
      error = clib_error_return (0, "Invalid worker(s).");
      goto done;
    case VNET_API_ERROR_FEATURE_DISABLED:
      error = clib_error_return (0,
        "Supported only if 2 or more workes available.");
      goto done;
    default:
      break;
    }

done:
  unformat_free (line_input);

  return error;
}

/*?
 * @cliexpar
 * @cliexstart{set snat workers}
 * Set SNAT workers if 2 or more workers available, use:
 *  vpp# set snat workers 0-2,5
 * @cliexend
?*/
VLIB_CLI_COMMAND (set_workers_command, static) = {
  .path = "set snat workers",
  .function = set_workers_command_fn,
  .short_help =
    "set snat workers <workers-list>",
};

static clib_error_t *
snat_ipfix_logging_enable_disable_command_fn (vlib_main_t * vm,
                                              unformat_input_t * input,
                                              vlib_cli_command_t * cmd)
{
  unformat_input_t _line_input, *line_input = &_line_input;
  u32 domain_id = 0;
  u32 src_port = 0;
  u8 enable = 1;
  int rv = 0;
  clib_error_t *error = 0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "domain %d", &domain_id))
        ;
      else if (unformat (line_input, "src-port %d", &src_port))
        ;
      else if (unformat (line_input, "disable"))
        enable = 0;
      else
        {
          error = clib_error_return (0, "unknown input '%U'",
            format_unformat_error, line_input);
          goto done;
        }
     }

  rv = snat_ipfix_logging_enable_disable (enable, domain_id, (u16) src_port);

  if (rv)
    {
      error = clib_error_return (0, "ipfix logging enable failed");
      goto done;
    }

done:
  unformat_free (line_input);

  return error;
}

/*?
 * @cliexpar
 * @cliexstart{snat ipfix logging}
 * To enable SNAT IPFIX logging use:
 *  vpp# snat ipfix logging
 * To set IPFIX exporter use:
 *  vpp# set ipfix exporter collector 10.10.10.3 src 10.10.10.1
 * @cliexend
?*/
VLIB_CLI_COMMAND (snat_ipfix_logging_enable_disable_command, static) = {
  .path = "snat ipfix logging",
  .function = snat_ipfix_logging_enable_disable_command_fn,
  .short_help = "snat ipfix logging [domain <domain-id>] [src-port <port>] [disable]",
};

static u32
snat_get_worker_in2out_cb (ip4_header_t * ip0, u32 rx_fib_index0)
{
  snat_main_t *sm = &snat_main;
  snat_user_key_t key0;
  clib_bihash_kv_8_8_t kv0, value0;
  u32 next_worker_index = 0;

  key0.addr = ip0->src_address;
  key0.fib_index = rx_fib_index0;

  kv0.key = key0.as_u64;

  /* Ever heard of of the "user" before? */
  if (clib_bihash_search_8_8 (&sm->worker_by_in, &kv0, &value0))
    {
      /* No, assign next available worker (RR) */
      next_worker_index = sm->first_worker_index;
      if (vec_len (sm->workers))
        {
          next_worker_index +=
            sm->workers[sm->next_worker++ % _vec_len (sm->workers)];
        }

      /* add non-traslated packets worker lookup */
      kv0.value = next_worker_index;
      clib_bihash_add_del_8_8 (&sm->worker_by_in, &kv0, 1);
    }
  else
    next_worker_index = value0.value;

  return next_worker_index;
}

static u32
snat_get_worker_out2in_cb (ip4_header_t * ip0, u32 rx_fib_index0)
{
  snat_main_t *sm = &snat_main;
  snat_worker_key_t key0;
  clib_bihash_kv_8_8_t kv0, value0;
  udp_header_t * udp0;
  u32 next_worker_index = 0;

  udp0 = ip4_next_header (ip0);

  key0.addr = ip0->dst_address;
  key0.port = udp0->dst_port;
  key0.fib_index = rx_fib_index0;

  if (PREDICT_FALSE(ip0->protocol == IP_PROTOCOL_ICMP))
    {
      icmp46_header_t * icmp0 = (icmp46_header_t *) udp0;
      icmp_echo_header_t *echo0 = (icmp_echo_header_t *)(icmp0+1);
      key0.port = echo0->identifier;
    }

  kv0.key = key0.as_u64;

  /* Ever heard of of the "user" before? */
  if (clib_bihash_search_8_8 (&sm->worker_by_out, &kv0, &value0))
    {
      key0.port = 0;
      kv0.key = key0.as_u64;

      if (clib_bihash_search_8_8 (&sm->worker_by_out, &kv0, &value0))
        {
          /* No, assign next available worker (RR) */
          next_worker_index = sm->first_worker_index;
          if (vec_len (sm->workers))
            {
              next_worker_index +=
                sm->workers[sm->next_worker++ % _vec_len (sm->workers)];
            }
        }
      else
        {
          /* Static mapping without port */
          next_worker_index = value0.value;
        }

      /* Add to translated packets worker lookup */
      kv0.value = next_worker_index;
      clib_bihash_add_del_8_8 (&sm->worker_by_out, &kv0, 1);
    }
  else
    next_worker_index = value0.value;

  return next_worker_index;
}

static clib_error_t *
snat_config (vlib_main_t * vm, unformat_input_t * input)
{
  snat_main_t * sm = &snat_main;
  u32 translation_buckets = 1024;
  u32 translation_memory_size = 128<<20;
  u32 user_buckets = 128;
  u32 user_memory_size = 64<<20;
  u32 max_translations_per_user = 100;
  u32 outside_vrf_id = 0;
  u32 inside_vrf_id = 0;
  u32 static_mapping_buckets = 1024;
  u32 static_mapping_memory_size = 64<<20;
  u8 static_mapping_only = 0;
  u8 static_mapping_connection_tracking = 0;

  sm->deterministic = 0;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "translation hash buckets %d", &translation_buckets))
        ;
      else if (unformat (input, "translation hash memory %d",
                         &translation_memory_size));
      else if (unformat (input, "user hash buckets %d", &user_buckets))
        ;
      else if (unformat (input, "user hash memory %d",
                         &user_memory_size))
        ;
      else if (unformat (input, "max translations per user %d",
                         &max_translations_per_user))
        ;
      else if (unformat (input, "outside VRF id %d",
                         &outside_vrf_id))
        ;
      else if (unformat (input, "inside VRF id %d",
                         &inside_vrf_id))
        ;
      else if (unformat (input, "static mapping only"))
        {
          static_mapping_only = 1;
          if (unformat (input, "connection tracking"))
            static_mapping_connection_tracking = 1;
        }
      else if (unformat (input, "deterministic"))
        sm->deterministic = 1;
      else
	return clib_error_return (0, "unknown input '%U'",
				  format_unformat_error, input);
    }

  /* for show commands, etc. */
  sm->translation_buckets = translation_buckets;
  sm->translation_memory_size = translation_memory_size;
  sm->user_buckets = user_buckets;
  sm->user_memory_size = user_memory_size;
  sm->max_translations_per_user = max_translations_per_user;
  sm->outside_vrf_id = outside_vrf_id;
  sm->outside_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4,
                                                             outside_vrf_id);
  sm->inside_vrf_id = inside_vrf_id;
  sm->inside_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4,
                                                            inside_vrf_id);
  sm->static_mapping_only = static_mapping_only;
  sm->static_mapping_connection_tracking = static_mapping_connection_tracking;

  if (sm->deterministic)
    {
      sm->in2out_node_index = snat_det_in2out_node.index;
      sm->in2out_output_node_index = ~0;
      sm->out2in_node_index = snat_det_out2in_node.index;
      sm->icmp_match_in2out_cb = icmp_match_in2out_det;
      sm->icmp_match_out2in_cb = icmp_match_out2in_det;
    }
  else
    {
      sm->worker_in2out_cb = snat_get_worker_in2out_cb;
      sm->worker_out2in_cb = snat_get_worker_out2in_cb;
      sm->in2out_node_index = snat_in2out_node.index;
      sm->in2out_output_node_index = snat_in2out_output_node.index;
      sm->out2in_node_index = snat_out2in_node.index;
      if (!static_mapping_only ||
          (static_mapping_only && static_mapping_connection_tracking))
        {
          sm->icmp_match_in2out_cb = icmp_match_in2out_slow;
          sm->icmp_match_out2in_cb = icmp_match_out2in_slow;

          clib_bihash_init_8_8 (&sm->worker_by_in, "worker-by-in", user_buckets,
                                user_memory_size);

          clib_bihash_init_8_8 (&sm->worker_by_out, "worker-by-out", user_buckets,
                                user_memory_size);

          clib_bihash_init_8_8 (&sm->in2out, "in2out", translation_buckets,
                                translation_memory_size);

          clib_bihash_init_8_8 (&sm->out2in, "out2in", translation_buckets,
                                translation_memory_size);

          clib_bihash_init_8_8 (&sm->user_hash, "users", user_buckets,
                                user_memory_size);

          clib_bihash_init_16_8 (&sm->in2out_unk_proto, "in2out-unk-proto",
                                 translation_buckets, translation_memory_size);

          clib_bihash_init_16_8 (&sm->out2in_unk_proto, "out2in-unk-proto",
                                 translation_buckets, translation_memory_size);
        }
      else
        {
          sm->icmp_match_in2out_cb = icmp_match_in2out_fast;
          sm->icmp_match_out2in_cb = icmp_match_out2in_fast;
        }
      clib_bihash_init_8_8 (&sm->static_mapping_by_local,
                            "static_mapping_by_local", static_mapping_buckets,
                            static_mapping_memory_size);

      clib_bihash_init_8_8 (&sm->static_mapping_by_external,
                            "static_mapping_by_external", static_mapping_buckets,
                            static_mapping_memory_size);
    }

  return 0;
}

VLIB_CONFIG_FUNCTION (snat_config, "snat");

u8 * format_snat_session_state (u8 * s, va_list * args)
{
  u32 i = va_arg (*args, u32);
  u8 *t = 0;

  switch (i)
    {
#define _(v, N, str) case SNAT_SESSION_##N: t = (u8 *) str; break;
    foreach_snat_session_state
#undef _
    default:
      t = format (t, "unknown");
    }
  s = format (s, "%s", t);
  return s;
}

u8 * format_snat_key (u8 * s, va_list * args)
{
  snat_session_key_t * key = va_arg (*args, snat_session_key_t *);
  char * protocol_string = "unknown";
  static char *protocol_strings[] = {
      "UDP",
      "TCP",
      "ICMP",
  };

  if (key->protocol < ARRAY_LEN(protocol_strings))
      protocol_string = protocol_strings[key->protocol];

  s = format (s, "%U proto %s port %d fib %d",
              format_ip4_address, &key->addr, protocol_string,
              clib_net_to_host_u16 (key->port), key->fib_index);
  return s;
}

u8 * format_snat_session (u8 * s, va_list * args)
{
  snat_main_t * sm __attribute__((unused)) = va_arg (*args, snat_main_t *);
  snat_session_t * sess = va_arg (*args, snat_session_t *);

  if (snat_is_unk_proto_session (sess))
    {
      s = format (s, "  i2o %U proto %u fib %u\n",
                  format_ip4_address, &sess->in2out.addr, sess->in2out.port,
                  sess->in2out.fib_index);
      s = format (s, "    o2i %U proto %u fib %u\n",
                  format_ip4_address, &sess->out2in.addr, sess->out2in.port,
                  sess->out2in.fib_index);
    }
  else
    {
      s = format (s, "  i2o %U\n", format_snat_key, &sess->in2out);
      s = format (s, "    o2i %U\n", format_snat_key, &sess->out2in);
    }
  s = format (s, "       last heard %.2f\n", sess->last_heard);
  s = format (s, "       total pkts %d, total bytes %lld\n",
              sess->total_pkts, sess->total_bytes);
  if (snat_is_session_static (sess))
    s = format (s, "       static translation\n");
  else
    s = format (s, "       dynamic translation\n");

  return s;
}

u8 * format_snat_user (u8 * s, va_list * args)
{
  snat_main_per_thread_data_t * sm = va_arg (*args, snat_main_per_thread_data_t *);
  snat_user_t * u = va_arg (*args, snat_user_t *);
  int verbose = va_arg (*args, int);
  dlist_elt_t * head, * elt;
  u32 elt_index, head_index;
  u32 session_index;
  snat_session_t * sess;

  s = format (s, "%U: %d dynamic translations, %d static translations\n",
              format_ip4_address, &u->addr, u->nsessions, u->nstaticsessions);

  if (verbose == 0)
    return s;

  if (u->nsessions || u->nstaticsessions)
    {
      head_index = u->sessions_per_user_list_head_index;
      head = pool_elt_at_index (sm->list_pool, head_index);

      elt_index = head->next;
      elt = pool_elt_at_index (sm->list_pool, elt_index);
      session_index = elt->value;

      while (session_index != ~0)
        {
          sess = pool_elt_at_index (sm->sessions, session_index);

          s = format (s, "  %U\n", format_snat_session, sm, sess);

          elt_index = elt->next;
          elt = pool_elt_at_index (sm->list_pool, elt_index);
          session_index = elt->value;
        }
    }

  return s;
}

u8 * format_snat_static_mapping (u8 * s, va_list * args)
{
  snat_static_mapping_t *m = va_arg (*args, snat_static_mapping_t *);

  if (m->addr_only)
      s = format (s, "local %U external %U vrf %d",
                  format_ip4_address, &m->local_addr,
                  format_ip4_address, &m->external_addr,
                  m->vrf_id);
  else
      s = format (s, "%U local %U:%d external %U:%d vrf %d",
                  format_snat_protocol, m->proto,
                  format_ip4_address, &m->local_addr, m->local_port,
                  format_ip4_address, &m->external_addr, m->external_port,
                  m->vrf_id);

  return s;
}

u8 * format_snat_static_map_to_resolve (u8 * s, va_list * args)
{
  snat_static_map_resolve_t *m = va_arg (*args, snat_static_map_resolve_t *);
  vnet_main_t *vnm = vnet_get_main();

  if (m->addr_only)
      s = format (s, "local %U external %U vrf %d",
                  format_ip4_address, &m->l_addr,
                  format_vnet_sw_interface_name, vnm,
                  vnet_get_sw_interface (vnm, m->sw_if_index),
                  m->vrf_id);
  else
      s = format (s, "%U local %U:%d external %U:%d vrf %d",
                  format_snat_protocol, m->proto,
                  format_ip4_address, &m->l_addr, m->l_port,
                  format_vnet_sw_interface_name, vnm,
                  vnet_get_sw_interface (vnm, m->sw_if_index), m->e_port,
                  m->vrf_id);

  return s;
}

u8 * format_det_map_ses (u8 * s, va_list * args)
{
  snat_det_map_t * det_map = va_arg (*args, snat_det_map_t *);
  ip4_address_t in_addr, out_addr;
  u32 in_offset, out_offset;
  snat_det_session_t * ses = va_arg (*args, snat_det_session_t *);
  u32 * i = va_arg (*args, u32 *);

  u32 user_index = *i / SNAT_DET_SES_PER_USER;
  in_addr.as_u32 = clib_host_to_net_u32 (
    clib_net_to_host_u32(det_map->in_addr.as_u32) + user_index);
  in_offset = clib_net_to_host_u32(in_addr.as_u32) -
    clib_net_to_host_u32(det_map->in_addr.as_u32);
  out_offset = in_offset / det_map->sharing_ratio;
  out_addr.as_u32 = clib_host_to_net_u32(
    clib_net_to_host_u32(det_map->out_addr.as_u32) + out_offset);
  s = format (s, "in %U:%d out %U:%d external host %U:%d state: %U expire: %d\n",
              format_ip4_address, &in_addr,
              clib_net_to_host_u16 (ses->in_port),
              format_ip4_address, &out_addr,
              clib_net_to_host_u16 (ses->out.out_port),
              format_ip4_address, &ses->out.ext_host_addr,
              clib_net_to_host_u16 (ses->out.ext_host_port),
              format_snat_session_state, ses->state,
              ses->expire);

  return s;
}

static clib_error_t *
show_snat_command_fn (vlib_main_t * vm,
		 unformat_input_t * input,
		 vlib_cli_command_t * cmd)
{
  int verbose = 0;
  snat_main_t * sm = &snat_main;
  snat_user_t * u;
  snat_static_mapping_t *m;
  snat_interface_t *i;
  snat_address_t * ap;
  vnet_main_t *vnm = vnet_get_main();
  snat_main_per_thread_data_t *tsm;
  u32 users_num = 0, sessions_num = 0, *worker, *sw_if_index;
  uword j = 0;
  snat_static_map_resolve_t *rp;
  snat_det_map_t * dm;
  snat_det_session_t * ses;

  if (unformat (input, "detail"))
    verbose = 1;
  else if (unformat (input, "verbose"))
    verbose = 2;

  if (sm->static_mapping_only)
    {
      if (sm->static_mapping_connection_tracking)
        vlib_cli_output (vm, "SNAT mode: static mapping only connection "
                         "tracking");
      else
        vlib_cli_output (vm, "SNAT mode: static mapping only");
    }
  else if (sm->deterministic)
    {
      vlib_cli_output (vm, "SNAT mode: deterministic mapping");
    }
  else
    {
      vlib_cli_output (vm, "SNAT mode: dynamic translations enabled");
    }

  if (verbose > 0)
    {
      pool_foreach (i, sm->interfaces,
      ({
        vlib_cli_output (vm, "%U %s", format_vnet_sw_interface_name, vnm,
                         vnet_get_sw_interface (vnm, i->sw_if_index),
                         i->is_inside ? "in" : "out");
      }));

      pool_foreach (i, sm->output_feature_interfaces,
      ({
        vlib_cli_output (vm, "%U output-feature %s",
                         format_vnet_sw_interface_name, vnm,
                         vnet_get_sw_interface (vnm, i->sw_if_index),
                         i->is_inside ? "in" : "out");
      }));

      if (vec_len (sm->auto_add_sw_if_indices))
        {
          vlib_cli_output (vm, "SNAT pool addresses interfaces:");
          vec_foreach (sw_if_index, sm->auto_add_sw_if_indices)
            {
              vlib_cli_output (vm, "%U", format_vnet_sw_interface_name, vnm,
                               vnet_get_sw_interface (vnm, *sw_if_index));
            }
        }

      vec_foreach (ap, sm->addresses)
        {
          vlib_cli_output (vm, "%U", format_ip4_address, &ap->addr);
          if (ap->fib_index != ~0)
              vlib_cli_output (vm, "  tenant VRF: %u",
                               ip4_fib_get(ap->fib_index)->table_id);
          else
            vlib_cli_output (vm, "  tenant VRF independent");
#define _(N, i, n, s) \
          vlib_cli_output (vm, "  %d busy %s ports", ap->busy_##n##_ports, s);
          foreach_snat_protocol
#undef _
        }
    }

  if (sm->num_workers > 1)
    {
      vlib_cli_output (vm, "%d workers", vec_len (sm->workers));
      if (verbose > 0)
        {
          vec_foreach (worker, sm->workers)
            {
              vlib_worker_thread_t *w =
                vlib_worker_threads + *worker + sm->first_worker_index;
              vlib_cli_output (vm, "  %s", w->name);
            }
        }
    }

  if (sm->deterministic)
    {
      vlib_cli_output (vm, "udp timeout: %dsec", sm->udp_timeout);
      vlib_cli_output (vm, "tcp-established timeout: %dsec",
                       sm->tcp_established_timeout);
      vlib_cli_output (vm, "tcp-transitory timeout: %dsec",
                       sm->tcp_transitory_timeout);
      vlib_cli_output (vm, "icmp timeout: %dsec", sm->icmp_timeout);
      vlib_cli_output (vm, "%d deterministic mappings",
                       pool_elts (sm->det_maps));
      if (verbose > 0)
        {
          pool_foreach (dm, sm->det_maps,
          ({
            vlib_cli_output (vm, "in %U/%d out %U/%d\n",
                             format_ip4_address, &dm->in_addr, dm->in_plen,
                             format_ip4_address, &dm->out_addr, dm->out_plen);
            vlib_cli_output (vm, " outside address sharing ratio: %d\n",
                             dm->sharing_ratio);
            vlib_cli_output (vm, " number of ports per inside host: %d\n",
                             dm->ports_per_host);
            vlib_cli_output (vm, " sessions number: %d\n", dm->ses_num);
            if (verbose > 1)
              {
                vec_foreach_index (j, dm->sessions)
                  {
                    ses = vec_elt_at_index (dm->sessions, j);
                    if (ses->in_port)
                      vlib_cli_output (vm, "  %U", format_det_map_ses, dm, ses,
                                       &j);
                  }
              }
          }));
        }
    }
  else
    {
      if (sm->static_mapping_only && !(sm->static_mapping_connection_tracking))
        {
          vlib_cli_output (vm, "%d static mappings",
                           pool_elts (sm->static_mappings));

          if (verbose > 0)
            {
              pool_foreach (m, sm->static_mappings,
              ({
                vlib_cli_output (vm, "%U", format_snat_static_mapping, m);
              }));
            }
        }
      else
        {
          vec_foreach (tsm, sm->per_thread_data)
            {
              users_num += pool_elts (tsm->users);
              sessions_num += pool_elts (tsm->sessions);
            }

          vlib_cli_output (vm, "%d users, %d outside addresses, %d active sessions,"
                           " %d static mappings",
                           users_num,
                           vec_len (sm->addresses),
                           sessions_num,
                           pool_elts (sm->static_mappings));

          if (verbose > 0)
            {
              vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->in2out,
                               verbose - 1);
              vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->out2in,
                               verbose - 1);
              vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->worker_by_in,
                               verbose - 1);
              vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->worker_by_out,
                               verbose - 1);
              vec_foreach_index (j, sm->per_thread_data)
                {
                  tsm = vec_elt_at_index (sm->per_thread_data, j);

                  if (pool_elts (tsm->users) == 0)
                    continue;

                  vlib_worker_thread_t *w = vlib_worker_threads + j;
                  vlib_cli_output (vm, "Thread %d (%s at lcore %u):", j, w->name,
                                   w->lcore_id);
                  vlib_cli_output (vm, "  %d list pool elements",
                                   pool_elts (tsm->list_pool));

                  pool_foreach (u, tsm->users,
                  ({
                    vlib_cli_output (vm, "  %U", format_snat_user, tsm, u,
                                     verbose - 1);
                  }));
                }

              if (pool_elts (sm->static_mappings))
                {
                  vlib_cli_output (vm, "static mappings:");
                  pool_foreach (m, sm->static_mappings,
                  ({
                    vlib_cli_output (vm, "%U", format_snat_static_mapping, m);
                  }));
                  for (j = 0; j < vec_len (sm->to_resolve); j++)
                    {
                      rp = sm->to_resolve + j;
                      vlib_cli_output (vm, "%U",
                                       format_snat_static_map_to_resolve, rp);
                    }
                }
            }
        }
    }
  return 0;
}

VLIB_CLI_COMMAND (show_snat_command, static) = {
    .path = "show snat",
    .short_help = "show snat",
    .function = show_snat_command_fn,
};


static void
snat_ip4_add_del_interface_address_cb (ip4_main_t * im,
                                       uword opaque,
                                       u32 sw_if_index,
                                       ip4_address_t * address,
                                       u32 address_length,
                                       u32 if_address_index,
                                       u32 is_delete)
{
  snat_main_t *sm = &snat_main;
  snat_static_map_resolve_t *rp;
  u32 *indices_to_delete = 0;
  int i, j;
  int rv;

  for (i = 0; i < vec_len(sm->auto_add_sw_if_indices); i++)
    {
      if (sw_if_index == sm->auto_add_sw_if_indices[i])
        {
          if (!is_delete)
            {
              /* Don't trip over lease renewal, static config */
              for (j = 0; j < vec_len(sm->addresses); j++)
                if (sm->addresses[j].addr.as_u32 == address->as_u32)
                  return;

              snat_add_address (sm, address, ~0);
              /* Scan static map resolution vector */
              for (j = 0; j < vec_len (sm->to_resolve); j++)
                {
                  rp = sm->to_resolve + j;
                  /* On this interface? */
                  if (rp->sw_if_index == sw_if_index)
                    {
                      /* Add the static mapping */
                      rv = snat_add_static_mapping (rp->l_addr,
                                                    address[0],
                                                    rp->l_port,
                                                    rp->e_port,
                                                    rp->vrf_id,
                                                    rp->addr_only,
                                                    ~0 /* sw_if_index */,
                                                    rp->proto,
                                                    rp->is_add);
                      if (rv)
                        clib_warning ("snat_add_static_mapping returned %d", 
                                      rv);
                      vec_add1 (indices_to_delete, j);
                    }
                }
              /* If we resolved any of the outstanding static mappings */
              if (vec_len(indices_to_delete))
                {
                  /* Delete them */
                  for (j = vec_len(indices_to_delete)-1; j >= 0; j--)
                    vec_delete(sm->to_resolve, 1, j);
                  vec_free(indices_to_delete);
                }
              return;
            }
          else
            {
              (void) snat_del_address(sm, address[0], 1);
              return;
            }
        }
    }
}


int snat_add_interface_address (snat_main_t *sm, u32 sw_if_index, int is_del)
{
  ip4_main_t * ip4_main = sm->ip4_main;
  ip4_address_t * first_int_addr;
  snat_static_map_resolve_t *rp;
  u32 *indices_to_delete = 0;
  int i, j;

  first_int_addr = ip4_interface_first_address (ip4_main, sw_if_index,
                                                0 /* just want the address*/);

  for (i = 0; i < vec_len(sm->auto_add_sw_if_indices); i++)
    {
      if (sm->auto_add_sw_if_indices[i] == sw_if_index)
        {
          if (is_del)
            {
              /* if have address remove it */
              if (first_int_addr)
                  (void) snat_del_address (sm, first_int_addr[0], 1);
              else
                {
                  for (j = 0; j < vec_len (sm->to_resolve); j++)
                    {
                      rp = sm->to_resolve + j;
                      if (rp->sw_if_index == sw_if_index)
                        vec_add1 (indices_to_delete, j);
                    }
                  if (vec_len(indices_to_delete))
                    {
                      for (j = vec_len(indices_to_delete)-1; j >= 0; j--)
                        vec_del1(sm->to_resolve, j);
                      vec_free(indices_to_delete);
                    }
                }
              vec_del1(sm->auto_add_sw_if_indices, i);
            }
          else
            return VNET_API_ERROR_VALUE_EXIST;

          return 0;
        }
    }
  
  if (is_del)
    return VNET_API_ERROR_NO_SUCH_ENTRY;

  /* add to the auto-address list */
  vec_add1(sm->auto_add_sw_if_indices, sw_if_index);

  /* If the address is already bound - or static - add it now */
  if (first_int_addr)
      snat_add_address (sm, first_int_addr, ~0);

  return 0;
}

static clib_error_t *
snat_add_interface_address_command_fn (vlib_main_t * vm,
                                       unformat_input_t * input,
                                       vlib_cli_command_t * cmd)
{
  snat_main_t *sm = &snat_main;
  unformat_input_t _line_input, *line_input = &_line_input;
  u32 sw_if_index;
  int rv;
  int is_del = 0;
  clib_error_t *error = 0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "%U", unformat_vnet_sw_interface,
                    sm->vnet_main, &sw_if_index))
        ;
      else if (unformat (line_input, "del"))
        is_del = 1;
      else
        {
          error = clib_error_return (0, "unknown input '%U'",
				     format_unformat_error, line_input);
          goto done;
        }
    }

  rv = snat_add_interface_address (sm, sw_if_index, is_del);

  switch (rv)
    {
    case 0:
      break;

    default:
      error = clib_error_return (0, "snat_add_interface_address returned %d",
                                 rv);
      goto done;
    }

done:
  unformat_free (line_input);

  return error;
}

VLIB_CLI_COMMAND (snat_add_interface_address_command, static) = {
    .path = "snat add interface address",
    .short_help = "snat add interface address <interface> [del]",
    .function = snat_add_interface_address_command_fn,
};

static clib_error_t *
snat_det_map_command_fn (vlib_main_t * vm,
                         unformat_input_t * input,
                         vlib_cli_command_t * cmd)
{
  snat_main_t *sm = &snat_main;
  unformat_input_t _line_input, *line_input = &_line_input;
  ip4_address_t in_addr, out_addr;
  u32 in_plen, out_plen;
  int is_add = 1, rv;
  clib_error_t *error = 0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "in %U/%u", unformat_ip4_address, &in_addr, &in_plen))
        ;
      else if (unformat (line_input, "out %U/%u", unformat_ip4_address, &out_addr, &out_plen))
        ;
      else if (unformat (line_input, "del"))
        is_add = 0;
      else
        {
          error = clib_error_return (0, "unknown input '%U'",
                                     format_unformat_error, line_input);
          goto done;
        }
    }

  unformat_free (line_input);

  rv = snat_det_add_map(sm, &in_addr, (u8) in_plen, &out_addr, (u8)out_plen,
                        is_add);

  if (rv)
    {
      error = clib_error_return (0, "snat_det_add_map return %d", rv);
      goto done;
    }

done:
  unformat_free (line_input);

  return error;
}

/*?
 * @cliexpar
 * @cliexstart{snat deterministic add}
 * Create bijective mapping of inside address to outside address and port range
 * pairs, with the purpose of enabling deterministic NAT to reduce logging in
 * CGN deployments.
 * To create deterministic mapping between inside network 10.0.0.0/18 and
 * outside network 1.1.1.0/30 use:
 * # vpp# snat deterministic add in 10.0.0.0/18 out 1.1.1.0/30
 * @cliexend
?*/
VLIB_CLI_COMMAND (snat_det_map_command, static) = {
    .path = "snat deterministic add",
    .short_help = "snat deterministic add in <addr>/<plen> out <addr>/<plen> [del]",
    .function = snat_det_map_command_fn,
};

static clib_error_t *
snat_det_forward_command_fn (vlib_main_t * vm,
                             unformat_input_t * input,
                             vlib_cli_command_t * cmd)
{
  snat_main_t *sm = &snat_main;
  unformat_input_t _line_input, *line_input = &_line_input;
  ip4_address_t in_addr, out_addr;
  u16 lo_port;
  snat_det_map_t * dm;
  clib_error_t *error = 0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "%U", unformat_ip4_address, &in_addr))
        ;
      else
        {
          error = clib_error_return (0, "unknown input '%U'",
                                     format_unformat_error, line_input);
          goto done;
        }
    }

  unformat_free (line_input);

  dm = snat_det_map_by_user(sm, &in_addr);
  if (!dm)
    vlib_cli_output (vm, "no match");
  else
    {
      snat_det_forward (dm, &in_addr, &out_addr, &lo_port);
      vlib_cli_output (vm, "%U:<%d-%d>", format_ip4_address, &out_addr,
                       lo_port, lo_port + dm->ports_per_host - 1);
    }

done:
  unformat_free (line_input);

  return error;
}

/*?
 * @cliexpar
 * @cliexstart{snat deterministic forward}
 * Return outside address and port range from inside address for deterministic
 * NAT.
 * To obtain outside address and port of inside host use:
 *  vpp# snat deterministic forward 10.0.0.2
 *  1.1.1.0:<1054-1068>
 * @cliexend
?*/
VLIB_CLI_COMMAND (snat_det_forward_command, static) = {
    .path = "snat deterministic forward",
    .short_help = "snat deterministic forward <addr>",
    .function = snat_det_forward_command_fn,
};

static clib_error_t *
snat_det_reverse_command_fn (vlib_main_t * vm,
                             unformat_input_t * input,
                             vlib_cli_command_t * cmd)
{
  snat_main_t *sm = &snat_main;
  unformat_input_t _line_input, *line_input = &_line_input;
  ip4_address_t in_addr, out_addr;
  u32 out_port;
  snat_det_map_t * dm;
  clib_error_t *error = 0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "%U:%d", unformat_ip4_address, &out_addr, &out_port))
        ;
      else
        {
          error =  clib_error_return (0, "unknown input '%U'",
                                      format_unformat_error, line_input);
        }
    }

  unformat_free (line_input);

  if (out_port < 1024 || out_port > 65535)
    {
      error = clib_error_return (0, "wrong port, must be <1024-65535>");
      goto done;
    }

  dm = snat_det_map_by_out(sm, &out_addr);
  if (!dm)
    vlib_cli_output (vm, "no match");
  else
    {
      snat_det_reverse (dm, &out_addr, (u16) out_port, &in_addr);
      vlib_cli_output (vm, "%U", format_ip4_address, &in_addr);
    }

done:
  unformat_free (line_input);

  return error;
}

/*?
 * @cliexpar
 * @cliexstart{snat deterministic reverse}
 * Return inside address from outside address and port for deterministic NAT.
 * To obtain inside host address from outside address and port use:
 *  #vpp snat deterministic reverse 1.1.1.1:1276
 *  10.0.16.16
 * @cliexend
?*/
VLIB_CLI_COMMAND (snat_det_reverse_command, static) = {
    .path = "snat deterministic reverse",
    .short_help = "snat deterministic reverse <addr>:<port>",
    .function = snat_det_reverse_command_fn,
};

static clib_error_t *
set_timeout_command_fn (vlib_main_t * vm,
                        unformat_input_t * input,
                        vlib_cli_command_t * cmd)
{
  snat_main_t *sm = &snat_main;
  unformat_input_t _line_input, *line_input = &_line_input;
  clib_error_t *error = 0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "udp %u", &sm->udp_timeout))
        ;
      else if (unformat (line_input, "tcp-established %u",
               &sm->tcp_established_timeout))
        ;
      else if (unformat (line_input, "tcp-transitory %u",
               &sm->tcp_transitory_timeout))
        ;
      else if (unformat (line_input, "icmp %u", &sm->icmp_timeout))
        ;
      else if (unformat (line_input, "reset"))
        {
          sm->udp_timeout = SNAT_UDP_TIMEOUT;
          sm->tcp_established_timeout = SNAT_TCP_ESTABLISHED_TIMEOUT;
          sm->tcp_transitory_timeout = SNAT_TCP_TRANSITORY_TIMEOUT;
          sm->icmp_timeout = SNAT_ICMP_TIMEOUT;
        }
      else
        {
          error = clib_error_return (0, "unknown input '%U'",
                                     format_unformat_error, line_input);
          goto done;
        }
    }

  unformat_free (line_input);

done:
  unformat_free (line_input);

  return error;
}

/*?
 * @cliexpar
 * @cliexstart{set snat deterministic timeout}
 * Set values of timeouts for deterministic NAT (in seconds), use:
 *  vpp# set snat deterministic timeout udp 120 tcp-established 7500
 *  tcp-transitory 250 icmp 90
 * To reset default values use:
 *  vpp# set snat deterministic timeout reset
 * @cliexend
?*/
VLIB_CLI_COMMAND (set_timeout_command, static) = {
  .path = "set snat deterministic timeout",
  .function = set_timeout_command_fn,
  .short_help =
    "set snat deterministic timeout [udp <sec> | tcp-established <sec> "
    "tcp-transitory <sec> | icmp <sec> | reset]",
};

static clib_error_t *
snat_det_close_session_out_fn (vlib_main_t *vm,
                               unformat_input_t * input,
                               vlib_cli_command_t * cmd)
{
  snat_main_t *sm = &snat_main;
  unformat_input_t _line_input, *line_input = &_line_input;
  ip4_address_t out_addr, ext_addr, in_addr;
  u16 out_port, ext_port;
  snat_det_map_t * dm;
  snat_det_session_t * ses;
  snat_det_out_key_t key;
  clib_error_t *error = 0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "%U:%d %U:%d",
                    unformat_ip4_address, &out_addr, &out_port,
                    unformat_ip4_address, &ext_addr, &ext_port))
        ;
      else
        {
          error = clib_error_return (0, "unknown input '%U'",
                                     format_unformat_error, line_input);
          goto done;
        }
    }

  unformat_free (line_input);

  dm = snat_det_map_by_out(sm, &out_addr);
  if (!dm)
    vlib_cli_output (vm, "no match");
  else
    {
      snat_det_reverse(dm, &ext_addr, out_port, &in_addr);
      key.ext_host_addr = out_addr;
      key.ext_host_port = ntohs(ext_port);
      key.out_port = ntohs(out_port);
      ses = snat_det_get_ses_by_out(dm, &out_addr, key.as_u64);
      if (!ses)
        vlib_cli_output (vm, "no match");
      else
       snat_det_ses_close(dm, ses);
    }

done:
  unformat_free (line_input);

  return error;
}

/*?
 * @cliexpar
 * @cliexstart{snat deterministic close session out}
 * Close session using outside ip address and port
 * and external ip address and port, use:
 *  vpp# snat deterministic close session out 1.1.1.1:1276 2.2.2.2:2387
 * @cliexend
?*/
VLIB_CLI_COMMAND (snat_det_close_sesion_out_command, static) = {
  .path = "snat deterministic close session out",
  .short_help = "snat deterministic close session out "
                "<out_addr>:<out_port> <ext_addr>:<ext_port>",
  .function = snat_det_close_session_out_fn,
};

static clib_error_t *
snat_det_close_session_in_fn (vlib_main_t *vm,
                              unformat_input_t * input,
                              vlib_cli_command_t * cmd)
{
  snat_main_t *sm = &snat_main;
  unformat_input_t _line_input, *line_input = &_line_input;
  ip4_address_t in_addr, ext_addr;
  u16 in_port, ext_port;
  snat_det_map_t * dm;
  snat_det_session_t * ses;
  snat_det_out_key_t key;
  clib_error_t *error = 0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "%U:%d %U:%d",
                    unformat_ip4_address, &in_addr, &in_port,
                    unformat_ip4_address, &ext_addr, &ext_port))
        ;
      else
        {
          error = clib_error_return (0, "unknown input '%U'",
                                     format_unformat_error, line_input);
          goto done;
        }
    }

  unformat_free (line_input);

  dm = snat_det_map_by_user (sm, &in_addr);
  if (!dm)
    vlib_cli_output (vm, "no match");
  else
    {
      key.ext_host_addr = ext_addr;
      key.ext_host_port = ntohs (ext_port);
      ses = snat_det_find_ses_by_in (dm, &in_addr, ntohs(in_port), key);
      if (!ses)
        vlib_cli_output (vm, "no match");
      else
        snat_det_ses_close(dm, ses);
    }

done:
  unformat_free(line_input);

  return error;
}

/*?
 * @cliexpar
 * @cliexstart{snat deterministic close_session_in}
 * Close session using inside ip address and port
 * and external ip address and port, use:
 *  vpp# snat deterministic close session in 3.3.3.3:3487 2.2.2.2:2387
 * @cliexend
?*/
VLIB_CLI_COMMAND (snat_det_close_session_in_command, static) = {
  .path = "snat deterministic close session in",
  .short_help = "snat deterministic close session in "
                "<in_addr>:<in_port> <ext_addr>:<ext_port>",
  .function = snat_det_close_session_in_fn,
};