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path: root/src/plugins/nat/in2out.c
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/*
 * Copyright (c) 2015 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.
 */
/*
 * node_format.c: node formatting
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <vlib/vlib.h>

u8 *
format_vlib_node_graph (u8 * s, va_list * va)
{
  vlib_node_main_t *nm = va_arg (*va, vlib_node_main_t *);
  vlib_node_t *n = va_arg (*va, vlib_node_t *);
  int i, j;
  u32 indent;
  typedef struct
  {
    u32 next_node;
    u32 next_slot;
    u32 prev_node;
  } tmp_t;
  tmp_t *tmps = 0;
  tmp_t empty = {.next_node = ~0,.prev_node = ~0 };

  if (!n)
    return format (s, "%=26s%=26s%=26s", "Name", "Next", "Previous");

  s = format (s, "%-26v", n->name);

  indent = format_get_indent (s);

  for (i = j = 0; i < vec_len (n->next_nodes); i++)
    {
      if (n->next_nodes[i] == VLIB_INVALID_NODE_INDEX)
	continue;
      vec_validate_init_empty (tmps, j, empty);
      tmps[j].next_node = n->next_nodes[i];
      tmps[j].next_slot = i;
      j++;
    }

  j = 0;
  /* *INDENT-OFF* */
  clib_bitmap_foreach (i, n->prev_node_bitmap)  {
	vec_validate_init_empty (tmps, j, empty);
	tmps[j].prev_node = i;
	j++;
      }
  /* *INDENT-ON* */

  for (i = 0; i < vec_len (tmps); i++)
    {
      if (i > 0)
	s = format (s, "\n%U", format_white_space, indent);

      if (tmps[i].next_node != ~0)
	{
	  vlib_node_t *x;
	  u8 *t = 0;

	  x = vec_elt (nm->nodes, tmps[i].next_node);
	  t = format (t, "%v [%d]", x->name, tmps[i].next_slot);
	  s = format (s, "%=26v", t);
	  vec_free (t);
	}
      else
	s = format (s, "%26s", "");

      if (tmps[i].prev_node != ~0)
	{
	  vlib_node_t *x;
	  x = vec_elt (nm->nodes, tmps[i].prev_node);
	  s = format (s, "%=26v", x->name);
	}
    }

  vec_free (tmps);

  return s;
}

u8 *
format_vlib_node_and_next (u8 * s, va_list * va)
{
  vlib_main_t *vm = va_arg (*va, vlib_main_t *);
  vlib_node_t *n = va_arg (*va, vlib_node_t *);
  u32 next_index = va_arg (*va, u32);
  vlib_node_t *n_next;
  u32 *ni;

  ni = vec_elt_at_index (n->next_nodes, next_index);
  n_next = vlib_get_node (vm, ni[0]);
  return format (s, "%v -> %v", n->name, n_next->name);
}

u8 *
format_vlib_node_name (u8 * s, va_list * va)
{
  vlib_main_t *vm = va_arg (*va, vlib_main_t *);
  u32 node_index = va_arg (*va, u32);
  vlib_node_t *n = vlib_get_node (vm, node_index);

  return format (s, "%v", n->name);
}

u8 *
format_vlib_next_node_name (u8 * s, va_list * va)
{
  vlib_main_t *vm = va_arg (*va, vlib_main_t *);
  u32 node_index = va_arg (*va, u32);
  u32 next_index = va_arg (*va, u32);
  vlib_node_t *next = vlib_get_next_node (vm, node_index, next_index);
  return format (s, "%v", next->name);
}

/* Parse node name -> node index. */
uword
unformat_vlib_node (unformat_input_t * input, va_list * args)
{
  vlib_main_t *vm = va_arg (*args, vlib_main_t *);
  u32 *result = va_arg (*args, u32 *);

  return unformat_user (input, unformat_hash_vec_string,
			vm->node_main.node_by_name, result);
}

u8 *
format_vlib_time (u8 * s, va_list * va)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
  f64 time = va_arg (*va, f64);
  return format (s, "%12.4f", time);
}

u8 *
format_vlib_cpu_time (u8 * s, va_list * va)
{
  vlib_main_t *vm = va_arg (*va, vlib_main_t *);
  u64 cpu_time = va_arg (*va, u64);
  f64 dt;

  dt =
    (cpu_time -
     vm->clib_time.init_cpu_time) * vm->clib_time.seconds_per_clock;
  return format (s, "%U", format_vlib_time, vm, dt);
}

uword
unformat_vlib_node_variant (unformat_input_t *input, va_list *args)
{
  vlib_main_t *vm = vlib_get_main ();
  u32 *march_variant = va_arg (*args, u32 *);
  uword *p;
  u8 *str = 0;

  if (unformat (input, "%s", &str) == 0)
    return 0;

  p = hash_get (vm->node_main.node_fn_march_variant_by_suffix, str);

  vec_free (str);

  if (p)
    *march_variant = p[0];

  return p ? 1 : 0;
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */
0' href='#n1260'>1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981
/*
 * 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.
 */
/**
 * @file
 * @brief NAT44 inside to outside network translation
 */

#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/pg/pg.h>

#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/fib/ip4_fib.h>
#include <vnet/udp/udp.h>
#include <nat/nat.h>
#include <nat/nat_ipfix_logging.h>
#include <nat/nat_inlines.h>
#include <nat/nat44/inlines.h>
#include <nat/nat_syslog.h>
#include <nat/nat_ha.h>

#include <vppinfra/hash.h>
#include <vppinfra/error.h>
#include <vppinfra/elog.h>
#include <nat/lib/nat_inlines.h>

typedef struct
{
  u32 sw_if_index;
  u32 next_index;
  u32 session_index;
  u32 is_slow_path;
  u32 is_hairpinning;
} snat_in2out_trace_t;

/* packet trace format function */
static u8 *
format_snat_in2out_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  snat_in2out_trace_t *t = va_arg (*args, snat_in2out_trace_t *);
  char *tag;

  tag = t->is_slow_path ? "NAT44_IN2OUT_SLOW_PATH" : "NAT44_IN2OUT_FAST_PATH";

  s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag,
	      t->sw_if_index, t->next_index, t->session_index);
  if (t->is_hairpinning)
    {
      s = format (s, ", with-hairpinning");
    }

  return s;
}

static u8 *
format_snat_in2out_fast_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  snat_in2out_trace_t *t = va_arg (*args, snat_in2out_trace_t *);

  s = format (s, "NAT44_IN2OUT_FAST: sw_if_index %d, next index %d",
	      t->sw_if_index, t->next_index);

  return s;
}

#define foreach_snat_in2out_error                       \
_(UNSUPPORTED_PROTOCOL, "unsupported protocol")         \
_(OUT_OF_PORTS, "out of ports")                         \
_(BAD_OUTSIDE_FIB, "outside VRF ID not found")          \
_(BAD_ICMP_TYPE, "unsupported ICMP type")               \
_(NO_TRANSLATION, "no translation")                     \
_(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded")   \
_(CANNOT_CREATE_USER, "cannot create NAT user")

typedef enum
{
#define _(sym,str) SNAT_IN2OUT_ERROR_##sym,
  foreach_snat_in2out_error
#undef _
    SNAT_IN2OUT_N_ERROR,
} snat_in2out_error_t;

static char *snat_in2out_error_strings[] = {
#define _(sym,string) string,
  foreach_snat_in2out_error
#undef _
};

typedef enum
{
  SNAT_IN2OUT_NEXT_LOOKUP,
  SNAT_IN2OUT_NEXT_DROP,
  SNAT_IN2OUT_NEXT_ICMP_ERROR,
  SNAT_IN2OUT_NEXT_SLOW_PATH,
  SNAT_IN2OUT_N_NEXT,
} snat_in2out_next_t;

static inline int
snat_not_translate (snat_main_t * sm, vlib_node_runtime_t * node,
		    u32 sw_if_index0, ip4_header_t * ip0, u32 proto0,
		    u32 rx_fib_index0, u32 thread_index)
{
  udp_header_t *udp0 = ip4_next_header (ip0);
  clib_bihash_kv_8_8_t kv0, value0;

  init_nat_k (&kv0, ip0->dst_address, udp0->dst_port, sm->outside_fib_index,
	      proto0);

  /* NAT packet aimed at external address if */
  /* has active sessions */
  if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0,
			      &value0))
    {
      /* or is static mappings */
      ip4_address_t placeholder_addr;
      u16 placeholder_port;
      u32 placeholder_fib_index;
      if (!snat_static_mapping_match
	  (sm, ip0->dst_address, udp0->dst_port, sm->outside_fib_index,
	   proto0, &placeholder_addr, &placeholder_port,
	   &placeholder_fib_index, 1, 0, 0, 0, 0, 0))
	return 0;
    }
  else
    return 0;

  if (sm->forwarding_enabled)
    return 1;

  return snat_not_translate_fast (sm, node, sw_if_index0, ip0, proto0,
				  rx_fib_index0);
}

static inline int
nat_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip0,
				  u32 proto0, u16 src_port, u16 dst_port,
				  u32 thread_index, u32 sw_if_index)
{
  clib_bihash_kv_8_8_t kv0, value0;
  snat_interface_t *i;

  /* src NAT check */
  init_nat_k (&kv0, ip0->src_address, src_port,
	      ip4_fib_table_get_index_for_sw_if_index (sw_if_index), proto0);

  if (!clib_bihash_search_8_8
      (&sm->per_thread_data[thread_index].out2in, &kv0, &value0))
    return 1;

  /* dst NAT check */
  init_nat_k (&kv0, ip0->dst_address, dst_port,
	      ip4_fib_table_get_index_for_sw_if_index (sw_if_index), proto0);
  if (!clib_bihash_search_8_8
      (&sm->per_thread_data[thread_index].in2out, &kv0, &value0))
    {
      /* hairpinning */
    /* *INDENT-OFF* */
    pool_foreach (i, sm->output_feature_interfaces,
    ({
      if ((nat_interface_is_inside(i)) && (sw_if_index == i->sw_if_index))
        return 0;
    }));
    /* *INDENT-ON* */
      return 1;
    }

  return 0;
}

#ifndef CLIB_MARCH_VARIANT
int
nat44_i2o_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg)
{
  snat_main_t *sm = &snat_main;
  nat44_is_idle_session_ctx_t *ctx = arg;
  snat_session_t *s;
  u64 sess_timeout_time;
  snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
						       ctx->thread_index);
  clib_bihash_kv_8_8_t s_kv;

  s = pool_elt_at_index (tsm->sessions, kv->value);
  sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
  if (ctx->now >= sess_timeout_time)
    {
      init_nat_o2i_k (&s_kv, s);
      if (clib_bihash_add_del_8_8 (&tsm->out2in, &s_kv, 0))
	nat_elog_warn ("out2in key del failed");

      snat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
					   s->in2out.addr.as_u32,
					   s->out2in.addr.as_u32,
					   s->nat_proto,
					   s->in2out.port,
					   s->out2in.port,
					   s->in2out.fib_index);

      nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
			       &s->in2out.addr, s->in2out.port,
			       &s->out2in.addr, s->out2in.port, s->nat_proto);

      nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
		   s->ext_host_port, s->nat_proto, s->out2in.fib_index,
		   ctx->thread_index);

      if (!snat_is_session_static (s))
	snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
					    &s->out2in.addr,
					    s->out2in.port, s->nat_proto);

      nat44_delete_session (sm, s, ctx->thread_index);
      return 1;
    }

  return 0;
}
#endif

static u32
slow_path (snat_main_t * sm, vlib_buffer_t * b0,
	   ip4_header_t * ip0,
	   ip4_address_t i2o_addr,
	   u16 i2o_port,
	   u32 rx_fib_index0,
	   nat_protocol_t nat_proto,
	   snat_session_t ** sessionp,
	   vlib_node_runtime_t * node, u32 next0, u32 thread_index, f64 now)
{
  snat_user_t *u;
  snat_session_t *s = 0;
  clib_bihash_kv_8_8_t kv0;
  u8 is_sm = 0;
  nat_outside_fib_t *outside_fib;
  fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
  u8 identity_nat;
  fib_prefix_t pfx = {
    .fp_proto = FIB_PROTOCOL_IP4,
    .fp_len = 32,
    .fp_addr = {
		.ip4.as_u32 = ip0->dst_address.as_u32,
		},
  };
  nat44_is_idle_session_ctx_t ctx0;
  ip4_address_t sm_addr;
  u16 sm_port;
  u32 sm_fib_index;

  if (PREDICT_FALSE (nat44_maximum_sessions_exceeded (sm, thread_index)))
    {
      b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED];
      nat_ipfix_logging_max_sessions (thread_index,
				      sm->max_translations_per_thread);
      nat_elog_notice ("maximum sessions exceeded");
      return SNAT_IN2OUT_NEXT_DROP;
    }

  /* First try to match static mapping by local address and port */
  if (snat_static_mapping_match
      (sm, i2o_addr, i2o_port, rx_fib_index0, nat_proto, &sm_addr,
       &sm_port, &sm_fib_index, 0, 0, 0, 0, 0, &identity_nat))
    {
      /* Try to create dynamic translation */
      if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index0,
					       thread_index,
					       nat_proto,
					       &sm_addr, &sm_port,
					       sm->port_per_thread,
					       sm->per_thread_data
					       [thread_index].snat_thread_index))
	{
	  b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS];
	  return SNAT_IN2OUT_NEXT_DROP;
	}
    }
  else
    {
      if (PREDICT_FALSE (identity_nat))
	{
	  *sessionp = s;
	  return next0;
	}

      is_sm = 1;
    }

  u = nat_user_get_or_create (sm, &ip0->src_address, rx_fib_index0,
			      thread_index);
  if (!u)
    {
      b0->error = node->errors[SNAT_IN2OUT_ERROR_CANNOT_CREATE_USER];
      return SNAT_IN2OUT_NEXT_DROP;
    }

  s = nat_session_alloc_or_recycle (sm, u, thread_index, now);
  if (!s)
    {
      nat44_delete_user_with_no_session (sm, u, thread_index);
      nat_elog_warn ("create NAT session failed");
      return SNAT_IN2OUT_NEXT_DROP;
    }

  if (is_sm)
    s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
  user_session_increment (sm, u, is_sm);
  s->in2out.addr = i2o_addr;
  s->in2out.port = i2o_port;
  s->in2out.fib_index = rx_fib_index0;
  s->nat_proto = nat_proto;
  s->out2in.addr = sm_addr;
  s->out2in.port = sm_port;
  s->out2in.fib_index = sm->outside_fib_index;
  switch (vec_len (sm->outside_fibs))
    {
    case 0:
      s->out2in.fib_index = sm->outside_fib_index;
      break;
    case 1:
      s->out2in.fib_index = sm->outside_fibs[0].fib_index;
      break;
    default:
      /* *INDENT-OFF* */
      vec_foreach (outside_fib, sm->outside_fibs)
        {
          fei = fib_table_lookup (outside_fib->fib_index, &pfx);
          if (FIB_NODE_INDEX_INVALID != fei)
            {
              if (fib_entry_get_resolving_interface (fei) != ~0)
                {
                  s->out2in.fib_index = outside_fib->fib_index;
                  break;
                }
            }
        }
      /* *INDENT-ON* */
      break;
    }
  s->ext_host_addr.as_u32 = ip0->dst_address.as_u32;
  s->ext_host_port = vnet_buffer (b0)->ip.reass.l4_dst_port;
  *sessionp = s;

  /* Add to translation hashes */
  ctx0.now = now;
  ctx0.thread_index = thread_index;
  init_nat_i2o_kv (&kv0, s, s - sm->per_thread_data[thread_index].sessions);
  if (clib_bihash_add_or_overwrite_stale_8_8
      (&sm->per_thread_data[thread_index].in2out, &kv0,
       nat44_i2o_is_idle_session_cb, &ctx0))
    nat_elog_notice ("in2out key add failed");

  init_nat_o2i_kv (&kv0, s, s - sm->per_thread_data[thread_index].sessions);
  if (clib_bihash_add_or_overwrite_stale_8_8
      (&sm->per_thread_data[thread_index].out2in, &kv0,
       nat44_o2i_is_idle_session_cb, &ctx0))
    nat_elog_notice ("out2in key add failed");

  /* log NAT event */
  snat_ipfix_logging_nat44_ses_create (thread_index,
				       s->in2out.addr.as_u32,
				       s->out2in.addr.as_u32,
				       s->nat_proto,
				       s->in2out.port,
				       s->out2in.port, s->in2out.fib_index);

  nat_syslog_nat44_apmadd (s->user_index, s->in2out.fib_index,
			   &s->in2out.addr, s->in2out.port, &s->out2in.addr,
			   s->out2in.port, s->nat_proto);

  nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
	       s->out2in.port, &s->ext_host_addr, s->ext_host_port,
	       &s->ext_host_nat_addr, s->ext_host_nat_port,
	       s->nat_proto, s->in2out.fib_index, s->flags, thread_index, 0);

  return next0;
}

#ifndef CLIB_MARCH_VARIANT
static_always_inline snat_in2out_error_t
icmp_get_key (vlib_buffer_t * b, ip4_header_t * ip0,
	      ip4_address_t * addr, u16 * port, nat_protocol_t * nat_proto)
{
  icmp46_header_t *icmp0;
  icmp_echo_header_t *echo0, *inner_echo0 = 0;
  ip4_header_t *inner_ip0 = 0;
  void *l4_header = 0;
  icmp46_header_t *inner_icmp0;

  icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
  echo0 = (icmp_echo_header_t *) (icmp0 + 1);

  if (!icmp_type_is_error_message
      (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
    {
      *nat_proto = NAT_PROTOCOL_ICMP;
      *addr = ip0->src_address;
      *port = vnet_buffer (b)->ip.reass.l4_src_port;
    }
  else
    {
      inner_ip0 = (ip4_header_t *) (echo0 + 1);
      l4_header = ip4_next_header (inner_ip0);
      *nat_proto = ip_proto_to_nat_proto (inner_ip0->protocol);
      *addr = inner_ip0->dst_address;
      switch (*nat_proto)
	{
	case NAT_PROTOCOL_ICMP:
	  inner_icmp0 = (icmp46_header_t *) l4_header;
	  inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
	  *port = inner_echo0->identifier;
	  break;
	case NAT_PROTOCOL_UDP:
	case NAT_PROTOCOL_TCP:
	  *port = ((tcp_udp_header_t *) l4_header)->dst_port;
	  break;
	default:
	  return SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL;
	}
    }
  return -1;			/* success */
}

/**
 * Get address and port values to be used for ICMP packet translation
 * and create session if needed
 *
 * @param[in,out] sm             NAT main
 * @param[in,out] node           NAT node runtime
 * @param[in] thread_index       thread index
 * @param[in,out] b0             buffer containing packet to be translated
 * @param[in,out] ip0            ip header
 * @param[out] p_proto           protocol used for matching
 * @param[out] p_value           address and port after NAT translation
 * @param[out] p_dont_translate  if packet should not be translated
 * @param d                      optional parameter
 * @param e                      optional parameter
 */
u32
icmp_match_in2out_slow (snat_main_t * sm, vlib_node_runtime_t * node,
			u32 thread_index, vlib_buffer_t * b0,
			ip4_header_t * ip0, ip4_address_t * addr, u16 * port,
			u32 * fib_index, nat_protocol_t * proto, void *d,
			void *e, u8 * dont_translate)
{
  snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
  u32 sw_if_index0;
  snat_session_t *s0 = 0;
  clib_bihash_kv_8_8_t kv0, value0;
  u32 next0 = ~0;
  int err;
  vlib_main_t *vm = vlib_get_main ();
  *dont_translate = 0;

  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
  *fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);

  err = icmp_get_key (b0, ip0, addr, port, proto);
  if (err != -1)
    {
      b0->error = node->errors[err];
      next0 = SNAT_IN2OUT_NEXT_DROP;
      goto out;
    }

  init_nat_k (&kv0, *addr, *port, *fib_index, *proto);
  if (clib_bihash_search_8_8 (&tsm->in2out, &kv0, &value0))
    {
      if (vnet_buffer (b0)->sw_if_index[VLIB_TX] != ~0)
	{
	  if (PREDICT_FALSE
	      (nat_not_translate_output_feature
	       (sm, ip0, *proto, *port, *port, thread_index, sw_if_index0)))
	    {
	      *dont_translate = 1;
	      goto out;
	    }
	}
      else
	{
	  if (PREDICT_FALSE (snat_not_translate (sm, node, sw_if_index0,
						 ip0, NAT_PROTOCOL_ICMP,
						 *fib_index, thread_index)))
	    {
	      *dont_translate = 1;
	      goto out;
	    }
	}

      if (PREDICT_FALSE
	  (icmp_type_is_error_message
	   (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags)))
	{
	  b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
	  next0 = SNAT_IN2OUT_NEXT_DROP;
	  goto out;
	}

      next0 =
	slow_path (sm, b0, ip0, *addr, *port, *fib_index, *proto, &s0, node,
		   next0, thread_index, vlib_time_now (vm));

      if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
	goto out;

      if (!s0)
	{
	  *dont_translate = 1;
	  goto out;
	}
    }
  else
    {
      if (PREDICT_FALSE
	  (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
	   ICMP4_echo_request
	   && vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
	   ICMP4_echo_reply
	   && !icmp_type_is_error_message (vnet_buffer (b0)->ip.
					   reass.icmp_type_or_tcp_flags)))
	{
	  b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
	  next0 = SNAT_IN2OUT_NEXT_DROP;
	  goto out;
	}

      s0 = pool_elt_at_index (tsm->sessions, value0.value);
    }

out:
  if (s0)
    {
      *addr = s0->out2in.addr;
      *port = s0->out2in.port;
      *fib_index = s0->out2in.fib_index;
    }
  if (d)
    *(snat_session_t **) (d) = s0;
  return next0;
}
#endif

#ifndef CLIB_MARCH_VARIANT
/**
 * Get address and port values to be used for ICMP packet translation
 *
 * @param[in] sm                 NAT main
 * @param[in,out] node           NAT node runtime
 * @param[in] thread_index       thread index
 * @param[in,out] b0             buffer containing packet to be translated
 * @param[in,out] ip0            ip header
 * @param[out] p_proto           protocol used for matching
 * @param[out] p_value           address and port after NAT translation
 * @param[out] p_dont_translate  if packet should not be translated
 * @param d                      optional parameter
 * @param e                      optional parameter
 */
u32
icmp_match_in2out_fast (snat_main_t * sm, vlib_node_runtime_t * node,
			u32 thread_index, vlib_buffer_t * b0,
			ip4_header_t * ip0, ip4_address_t * addr, u16 * port,
			u32 * fib_index, nat_protocol_t * proto, void *d,
			void *e, u8 * dont_translate)
{
  u32 sw_if_index0;
  u8 is_addr_only;
  u32 next0 = ~0;
  int err;
  *dont_translate = 0;

  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
  *fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);

  err = icmp_get_key (b0, ip0, addr, port, proto);
  if (err != -1)
    {
      b0->error = node->errors[err];
      next0 = SNAT_IN2OUT_NEXT_DROP;
      goto out;
    }

  ip4_address_t sm_addr;
  u16 sm_port;
  u32 sm_fib_index;

  if (snat_static_mapping_match
      (sm, *addr, *port, *fib_index, *proto, &sm_addr, &sm_port,
       &sm_fib_index, 0, &is_addr_only, 0, 0, 0, 0))
    {
      if (PREDICT_FALSE (snat_not_translate_fast (sm, node, sw_if_index0, ip0,
						  IP_PROTOCOL_ICMP,
						  *fib_index)))
	{
	  *dont_translate = 1;
	  goto out;
	}

      if (icmp_type_is_error_message
	  (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags))
	{
	  next0 = SNAT_IN2OUT_NEXT_DROP;
	  goto out;
	}

      b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
      next0 = SNAT_IN2OUT_NEXT_DROP;
      goto out;
    }

  if (PREDICT_FALSE
      (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_request
       && (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
	   ICMP4_echo_reply || !is_addr_only)
       && !icmp_type_is_error_message (vnet_buffer (b0)->ip.
				       reass.icmp_type_or_tcp_flags)))
    {
      b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE];
      next0 = SNAT_IN2OUT_NEXT_DROP;
      goto out;
    }

out:
  return next0;
}
#endif

#ifndef CLIB_MARCH_VARIANT
u32
icmp_in2out (snat_main_t * sm,
	     vlib_buffer_t * b0,
	     ip4_header_t * ip0,
	     icmp46_header_t * icmp0,
	     u32 sw_if_index0,
	     u32 rx_fib_index0,
	     vlib_node_runtime_t * node,
	     u32 next0, u32 thread_index, void *d, void *e)
{
  vlib_main_t *vm = vlib_get_main ();
  ip4_address_t addr;
  u16 port;
  u32 fib_index;
  nat_protocol_t protocol;
  icmp_echo_header_t *echo0, *inner_echo0 = 0;
  ip4_header_t *inner_ip0;
  void *l4_header = 0;
  icmp46_header_t *inner_icmp0;
  u8 dont_translate;
  u32 new_addr0, old_addr0;
  u16 old_id0, new_id0;
  u16 old_checksum0, new_checksum0;
  ip_csum_t sum0;
  u16 checksum0;
  u32 next0_tmp;

  echo0 = (icmp_echo_header_t *) (icmp0 + 1);

  next0_tmp =
    sm->icmp_match_in2out_cb (sm, node, thread_index, b0, ip0, &addr, &port,
			      &fib_index, &protocol, d, e, &dont_translate);
  if (next0_tmp != ~0)
    next0 = next0_tmp;
  if (next0 == SNAT_IN2OUT_NEXT_DROP || dont_translate)
    goto out;

  if (PREDICT_TRUE (!ip4_is_fragment (ip0)))
    {
      sum0 =
	ip_incremental_checksum_buffer (vm, b0,
					(u8 *) icmp0 -
					(u8 *) vlib_buffer_get_current (b0),
					ntohs (ip0->length) -
					ip4_header_bytes (ip0), 0);
      checksum0 = ~ip_csum_fold (sum0);
      if (PREDICT_FALSE (checksum0 != 0 && checksum0 != 0xffff))
	{
	  next0 = SNAT_IN2OUT_NEXT_DROP;
	  goto out;
	}
    }

  old_addr0 = ip0->src_address.as_u32;
  new_addr0 = ip0->src_address.as_u32 = addr.as_u32;

  sum0 = ip0->checksum;
  sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
			 src_address /* changed member */ );
  ip0->checksum = ip_csum_fold (sum0);

  if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
    {
      if (icmp0->checksum == 0)
	icmp0->checksum = 0xffff;

      if (!icmp_type_is_error_message (icmp0->type))
	{
	  new_id0 = port;
	  if (PREDICT_FALSE (new_id0 != echo0->identifier))
	    {
	      old_id0 = echo0->identifier;
	      new_id0 = port;
	      echo0->identifier = new_id0;

	      sum0 = icmp0->checksum;
	      sum0 =
		ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
				identifier);
	      icmp0->checksum = ip_csum_fold (sum0);
	    }
	}
      else
	{
	  inner_ip0 = (ip4_header_t *) (echo0 + 1);
	  l4_header = ip4_next_header (inner_ip0);

	  if (!ip4_header_checksum_is_valid (inner_ip0))
	    {
	      next0 = SNAT_IN2OUT_NEXT_DROP;
	      goto out;
	    }

	  /* update inner destination IP address */
	  old_addr0 = inner_ip0->dst_address.as_u32;
	  inner_ip0->dst_address = addr;
	  new_addr0 = inner_ip0->dst_address.as_u32;
	  sum0 = icmp0->checksum;
	  sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
				 dst_address /* changed member */ );
	  icmp0->checksum = ip_csum_fold (sum0);

	  /* update inner IP header checksum */
	  old_checksum0 = inner_ip0->checksum;
	  sum0 = inner_ip0->checksum;
	  sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
				 dst_address /* changed member */ );
	  inner_ip0->checksum = ip_csum_fold (sum0);
	  new_checksum0 = inner_ip0->checksum;
	  sum0 = icmp0->checksum;
	  sum0 =
	    ip_csum_update (sum0, old_checksum0, new_checksum0, ip4_header_t,
			    checksum);
	  icmp0->checksum = ip_csum_fold (sum0);

	  switch (protocol)
	    {
	    case NAT_PROTOCOL_ICMP:
	      inner_icmp0 = (icmp46_header_t *) l4_header;
	      inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);

	      old_id0 = inner_echo0->identifier;
	      new_id0 = port;
	      inner_echo0->identifier = new_id0;

	      sum0 = icmp0->checksum;
	      sum0 =
		ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
				identifier);
	      icmp0->checksum = ip_csum_fold (sum0);
	      break;
	    case NAT_PROTOCOL_UDP:
	    case NAT_PROTOCOL_TCP:
	      old_id0 = ((tcp_udp_header_t *) l4_header)->dst_port;
	      new_id0 = port;
	      ((tcp_udp_header_t *) l4_header)->dst_port = new_id0;

	      sum0 = icmp0->checksum;
	      sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t,
				     dst_port);
	      icmp0->checksum = ip_csum_fold (sum0);
	      break;
	    default:
	      ASSERT (0);
	    }
	}
    }

  if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0)
    {
      if (0 != snat_icmp_hairpinning (sm, b0, ip0, icmp0,
				      sm->endpoint_dependent))
	vnet_buffer (b0)->sw_if_index[VLIB_TX] = fib_index;
    }

out:
  return next0;
}
#endif

static inline u32
icmp_in2out_slow_path (snat_main_t * sm,
		       vlib_buffer_t * b0,
		       ip4_header_t * ip0,
		       icmp46_header_t * icmp0,
		       u32 sw_if_index0,
		       u32 rx_fib_index0,
		       vlib_node_runtime_t * node,
		       u32 next0,
		       f64 now, u32 thread_index, snat_session_t ** p_s0)
{
  vlib_main_t *vm = vlib_get_main ();

  next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
		       next0, thread_index, p_s0, 0);
  snat_session_t *s0 = *p_s0;
  if (PREDICT_TRUE (next0 != SNAT_IN2OUT_NEXT_DROP && s0))
    {
      /* Accounting */
      nat44_session_update_counters (s0, now,
				     vlib_buffer_length_in_chain
				     (vm, b0), thread_index);
      /* Per-user LRU list maintenance */
      nat44_session_update_lru (sm, s0, thread_index);
    }
  return next0;
}

static int
nat_in2out_sm_unknown_proto (snat_main_t * sm,
			     vlib_buffer_t * b,
			     ip4_header_t * ip, u32 rx_fib_index)
{
  clib_bihash_kv_8_8_t kv, value;
  snat_static_mapping_t *m;
  u32 old_addr, new_addr;
  ip_csum_t sum;

  init_nat_k (&kv, ip->src_address, 0, rx_fib_index, 0);
  if (clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value))
    return 1;

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

  old_addr = ip->src_address.as_u32;
  new_addr = ip->src_address.as_u32 = m->external_addr.as_u32;
  sum = ip->checksum;
  sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address);
  ip->checksum = ip_csum_fold (sum);


  /* Hairpinning */
  if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
    {
      vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
      nat_hairpinning_sm_unknown_proto (sm, b, ip);
    }

  return 0;
}

static inline uword
snat_in2out_node_fn_inline (vlib_main_t * vm,
			    vlib_node_runtime_t * node,
			    vlib_frame_t * frame, int is_slow_path,
			    int is_output_feature)
{
  u32 n_left_from, *from;
  snat_main_t *sm = &snat_main;
  f64 now = vlib_time_now (vm);
  u32 thread_index = vm->thread_index;

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;

  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
  u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
  vlib_get_buffers (vm, from, b, n_left_from);

  while (n_left_from >= 2)
    {
      vlib_buffer_t *b0, *b1;
      u32 next0, next1;
      u32 sw_if_index0, sw_if_index1;
      ip4_header_t *ip0, *ip1;
      ip_csum_t sum0, sum1;
      u32 new_addr0, old_addr0, new_addr1, old_addr1;
      u16 old_port0, new_port0, old_port1, new_port1;
      udp_header_t *udp0, *udp1;
      tcp_header_t *tcp0, *tcp1;
      icmp46_header_t *icmp0, *icmp1;
      u32 rx_fib_index0, rx_fib_index1;
      u32 proto0, proto1;
      snat_session_t *s0 = 0, *s1 = 0;
      clib_bihash_kv_8_8_t kv0, value0, kv1, value1;
      u32 iph_offset0 = 0, iph_offset1 = 0;

      b0 = *b;
      b++;
      b1 = *b;
      b++;

      /* Prefetch next iteration. */
      if (PREDICT_TRUE (n_left_from >= 4))
	{
	  vlib_buffer_t *p2, *p3;

	  p2 = *b;
	  p3 = *(b + 1);

	  vlib_prefetch_buffer_header (p2, LOAD);
	  vlib_prefetch_buffer_header (p3, LOAD);

	  CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, LOAD);
	  CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, LOAD);
	}

      if (is_output_feature)
	iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;

      ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
			      iph_offset0);

      udp0 = ip4_next_header (ip0);
      tcp0 = (tcp_header_t *) udp0;
      icmp0 = (icmp46_header_t *) udp0;

      sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
      rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
			       sw_if_index0);

      next0 = next1 = SNAT_IN2OUT_NEXT_LOOKUP;

      if (PREDICT_FALSE (ip0->ttl == 1))
	{
	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
	  icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
				       ICMP4_time_exceeded_ttl_exceeded_in_transit,
				       0);
	  next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
	  goto trace00;
	}

      proto0 = ip_proto_to_nat_proto (ip0->protocol);

      /* Next configured feature, probably ip4-lookup */
      if (is_slow_path)
	{
	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
	    {
	      if (nat_in2out_sm_unknown_proto (sm, b0, ip0, rx_fib_index0))
		{
		  next0 = SNAT_IN2OUT_NEXT_DROP;
		  b0->error =
		    node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
		}
	      vlib_increment_simple_counter (is_slow_path ? &sm->
					     counters.slowpath.in2out.
					     other : &sm->counters.fastpath.
					     in2out.other, thread_index,
					     sw_if_index0, 1);
	      goto trace00;
	    }

	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
	    {
	      next0 = icmp_in2out_slow_path
		(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0,
		 node, next0, now, thread_index, &s0);
	      vlib_increment_simple_counter (is_slow_path ? &sm->
					     counters.slowpath.in2out.
					     icmp : &sm->counters.fastpath.
					     in2out.icmp, thread_index,
					     sw_if_index0, 1);
	      goto trace00;
	    }
	}
      else
	{
	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
	    {
	      next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
	      goto trace00;
	    }

	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
	    {
	      next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
	      goto trace00;
	    }
	}

      init_nat_k (&kv0, ip0->src_address,
		  vnet_buffer (b0)->ip.reass.l4_src_port, rx_fib_index0,
		  proto0);
      if (PREDICT_FALSE
	  (clib_bihash_search_8_8
	   (&sm->per_thread_data[thread_index].in2out, &kv0, &value0) != 0))
	{
	  if (is_slow_path)
	    {
	      if (is_output_feature)
		{
		  if (PREDICT_FALSE
		      (nat_not_translate_output_feature
		       (sm, ip0, proto0,
			vnet_buffer (b0)->ip.reass.l4_src_port,
			vnet_buffer (b0)->ip.reass.l4_dst_port,
			thread_index, sw_if_index0)))
		    goto trace00;

		  /*
		   * Send DHCP packets to the ipv4 stack, or we won't
		   * be able to use dhcp client on the outside interface
		   */
		  if (PREDICT_FALSE
		      (proto0 == NAT_PROTOCOL_UDP
		       && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
			   clib_host_to_net_u16
			   (UDP_DST_PORT_dhcp_to_server))
		       && ip0->dst_address.as_u32 == 0xffffffff))
		    goto trace00;
		}
	      else
		{
		  if (PREDICT_FALSE
		      (snat_not_translate
		       (sm, node, sw_if_index0, ip0, proto0,
			rx_fib_index0, thread_index)))
		    goto trace00;
		}

	      next0 = slow_path (sm, b0, ip0,
				 ip0->src_address,
				 vnet_buffer (b0)->ip.reass.l4_src_port,
				 rx_fib_index0,
				 proto0, &s0, node, next0, thread_index, now);
	      if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
		goto trace00;

	      if (PREDICT_FALSE (!s0))
		goto trace00;
	    }
	  else
	    {
	      next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
	      goto trace00;
	    }
	}
      else
	s0 =
	  pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
			     value0.value);

      b0->flags |= VNET_BUFFER_F_IS_NATED;

      old_addr0 = ip0->src_address.as_u32;
      ip0->src_address = s0->out2in.addr;
      new_addr0 = ip0->src_address.as_u32;
      if (!is_output_feature)
	vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;

      sum0 = ip0->checksum;
      sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
			     ip4_header_t, src_address /* changed member */ );
      ip0->checksum = ip_csum_fold (sum0);


      if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
	{
	  if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
	    {
	      old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
	      new_port0 = udp0->src_port = s0->out2in.port;
	      sum0 = tcp0->checksum;
	      sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
				     ip4_header_t,
				     dst_address /* changed member */ );
	      sum0 = ip_csum_update (sum0, old_port0, new_port0,
				     ip4_header_t /* cheat */ ,
				     length /* changed member */ );
	      mss_clamping (sm->mss_clamping, tcp0, &sum0);
	      tcp0->checksum = ip_csum_fold (sum0);
	    }
	  vlib_increment_simple_counter (is_slow_path ? &sm->
					 counters.slowpath.in2out.tcp : &sm->
					 counters.fastpath.in2out.tcp,
					 thread_index, sw_if_index0, 1);
	}
      else
	{
	  if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
	    {
	      udp0->src_port = s0->out2in.port;
	      if (PREDICT_FALSE (udp0->checksum))
		{
		  old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
		  new_port0 = udp0->src_port;
		  sum0 = udp0->checksum;
		  sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address	/* changed member */
		    );
		  sum0 =
		    ip_csum_update (sum0, old_port0, new_port0,
				    ip4_header_t /* cheat */ ,
				    length /* changed member */ );
		  udp0->checksum = ip_csum_fold (sum0);
		}
	    }
	  vlib_increment_simple_counter (is_slow_path ? &sm->
					 counters.slowpath.in2out.udp : &sm->
					 counters.fastpath.in2out.udp,
					 thread_index, sw_if_index0, 1);
	}

      /* Accounting */
      nat44_session_update_counters (s0, now,
				     vlib_buffer_length_in_chain (vm, b0),
				     thread_index);
      /* Per-user LRU list maintenance */
      nat44_session_update_lru (sm, s0, thread_index);
    trace00:

      if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
			 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
	{
	  snat_in2out_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
	  t->is_slow_path = is_slow_path;
	  t->sw_if_index = sw_if_index0;
	  t->next_index = next0;
	  t->session_index = ~0;
	  if (s0)
	    t->session_index =
	      s0 - sm->per_thread_data[thread_index].sessions;
	}

      if (next0 == SNAT_IN2OUT_NEXT_DROP)
	{
	  vlib_increment_simple_counter (is_slow_path ? &sm->
					 counters.slowpath.in2out.
					 drops : &sm->counters.fastpath.
					 in2out.drops, thread_index,
					 sw_if_index0, 1);
	}

      if (is_output_feature)
	iph_offset1 = vnet_buffer (b1)->ip.reass.save_rewrite_length;

      ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) +
			      iph_offset1);

      udp1 = ip4_next_header (ip1);
      tcp1 = (tcp_header_t *) udp1;
      icmp1 = (icmp46_header_t *) udp1;

      sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
      rx_fib_index1 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
			       sw_if_index1);

      if (PREDICT_FALSE (ip1->ttl == 1))
	{
	  vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
	  icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
				       ICMP4_time_exceeded_ttl_exceeded_in_transit,
				       0);
	  next1 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
	  goto trace01;
	}

      proto1 = ip_proto_to_nat_proto (ip1->protocol);

      /* Next configured feature, probably ip4-lookup */
      if (is_slow_path)
	{
	  if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_OTHER))
	    {
	      if (nat_in2out_sm_unknown_proto (sm, b1, ip1, rx_fib_index1))
		{
		  next1 = SNAT_IN2OUT_NEXT_DROP;
		  b1->error =
		    node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
		}
	      vlib_increment_simple_counter (is_slow_path ? &sm->
					     counters.slowpath.in2out.
					     other : &sm->counters.fastpath.
					     in2out.other, thread_index,
					     sw_if_index1, 1);
	      goto trace01;
	    }

	  if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP))
	    {
	      next1 = icmp_in2out_slow_path
		(sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
		 next1, now, thread_index, &s1);
	      vlib_increment_simple_counter (is_slow_path ? &sm->
					     counters.slowpath.in2out.
					     icmp : &sm->counters.fastpath.
					     in2out.icmp, thread_index,
					     sw_if_index1, 1);
	      goto trace01;
	    }
	}
      else
	{
	  if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_OTHER))
	    {
	      next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
	      goto trace01;
	    }

	  if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP))
	    {
	      next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
	      goto trace01;
	    }
	}

      init_nat_k (&kv1, ip1->src_address,
		  vnet_buffer (b1)->ip.reass.l4_src_port, rx_fib_index1,
		  proto1);
      if (PREDICT_FALSE
	  (clib_bihash_search_8_8
	   (&sm->per_thread_data[thread_index].in2out, &kv1, &value1) != 0))
	{
	  if (is_slow_path)
	    {
	      if (is_output_feature)
		{
		  if (PREDICT_FALSE
		      (nat_not_translate_output_feature
		       (sm, ip1, proto1,
			vnet_buffer (b1)->ip.reass.l4_src_port,
			vnet_buffer (b1)->ip.reass.l4_dst_port,
			thread_index, sw_if_index1)))
		    goto trace01;

		  /*
		   * Send DHCP packets to the ipv4 stack, or we won't
		   * be able to use dhcp client on the outside interface
		   */
		  if (PREDICT_FALSE
		      (proto1 == NAT_PROTOCOL_UDP
		       && (vnet_buffer (b1)->ip.reass.l4_dst_port ==
			   clib_host_to_net_u16
			   (UDP_DST_PORT_dhcp_to_server))
		       && ip1->dst_address.as_u32 == 0xffffffff))
		    goto trace01;
		}
	      else
		{
		  if (PREDICT_FALSE
		      (snat_not_translate
		       (sm, node, sw_if_index1, ip1, proto1,
			rx_fib_index1, thread_index)))
		    goto trace01;
		}

	      next1 =
		slow_path (sm, b1, ip1, ip1->src_address,
			   vnet_buffer (b1)->ip.reass.l4_src_port,
			   rx_fib_index1, proto1, &s1, node, next1,
			   thread_index, now);
	      if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP))
		goto trace01;

	      if (PREDICT_FALSE (!s1))
		goto trace01;
	    }
	  else
	    {
	      next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
	      goto trace01;
	    }
	}
      else
	s1 =
	  pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
			     value1.value);

      b1->flags |= VNET_BUFFER_F_IS_NATED;

      old_addr1 = ip1->src_address.as_u32;
      ip1->src_address = s1->out2in.addr;
      new_addr1 = ip1->src_address.as_u32;
      if (!is_output_feature)
	vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index;

      sum1 = ip1->checksum;
      sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
			     ip4_header_t, src_address /* changed member */ );
      ip1->checksum = ip_csum_fold (sum1);

      if (PREDICT_TRUE (proto1 == NAT_PROTOCOL_TCP))
	{
	  if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment)
	    {
	      old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port;
	      new_port1 = udp1->src_port = s1->out2in.port;
	      sum1 = tcp1->checksum;
	      sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
				     ip4_header_t,
				     dst_address /* changed member */ );
	      sum1 = ip_csum_update (sum1, old_port1, new_port1,
				     ip4_header_t /* cheat */ ,
				     length /* changed member */ );
	      mss_clamping (sm->mss_clamping, tcp1, &sum1);
	      tcp1->checksum = ip_csum_fold (sum1);
	    }
	  vlib_increment_simple_counter (is_slow_path ? &sm->
					 counters.slowpath.in2out.tcp : &sm->
					 counters.fastpath.in2out.tcp,
					 thread_index, sw_if_index1, 1);
	}
      else
	{
	  if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment)
	    {
	      udp1->src_port = s1->out2in.port;
	      if (PREDICT_FALSE (udp1->checksum))
		{
		  old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port;
		  new_port1 = udp1->src_port;
		  sum1 = udp1->checksum;
		  sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, dst_address	/* changed member */
		    );
		  sum1 =
		    ip_csum_update (sum1, old_port1, new_port1,
				    ip4_header_t /* cheat */ ,
				    length /* changed member */ );
		  udp1->checksum = ip_csum_fold (sum1);
		}
	    }
	  vlib_increment_simple_counter (is_slow_path ? &sm->
					 counters.slowpath.in2out.udp : &sm->
					 counters.fastpath.in2out.udp,
					 thread_index, sw_if_index1, 1);
	}

      /* Accounting */
      nat44_session_update_counters (s1, now,
				     vlib_buffer_length_in_chain (vm, b1),
				     thread_index);
      /* Per-user LRU list maintenance */
      nat44_session_update_lru (sm, s1, thread_index);
    trace01:

      if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
			 && (b1->flags & VLIB_BUFFER_IS_TRACED)))
	{
	  snat_in2out_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t));
	  t->sw_if_index = sw_if_index1;
	  t->next_index = next1;
	  t->session_index = ~0;
	  if (s1)
	    t->session_index =
	      s1 - sm->per_thread_data[thread_index].sessions;
	}

      if (next1 == SNAT_IN2OUT_NEXT_DROP)
	{
	  vlib_increment_simple_counter (is_slow_path ? &sm->
					 counters.slowpath.in2out.
					 drops : &sm->counters.fastpath.
					 in2out.drops, thread_index,
					 sw_if_index1, 1);
	}

      n_left_from -= 2;
      next[0] = next0;
      next[1] = next1;
      next += 2;
    }

  while (n_left_from > 0)
    {
      vlib_buffer_t *b0;
      u32 next0;
      u32 sw_if_index0;
      ip4_header_t *ip0;
      ip_csum_t sum0;
      u32 new_addr0, old_addr0;
      u16 old_port0, new_port0;
      udp_header_t *udp0;
      tcp_header_t *tcp0;
      icmp46_header_t *icmp0;
      u32 rx_fib_index0;
      u32 proto0;
      snat_session_t *s0 = 0;
      clib_bihash_kv_8_8_t kv0, value0;
      u32 iph_offset0 = 0;

      b0 = *b;
      b++;
      next0 = SNAT_IN2OUT_NEXT_LOOKUP;

      if (is_output_feature)
	iph_offset0 = vnet_buffer (b0)->ip.reass.save_rewrite_length;

      ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
			      iph_offset0);

      udp0 = ip4_next_header (ip0);
      tcp0 = (tcp_header_t *) udp0;
      icmp0 = (icmp46_header_t *) udp0;

      sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
      rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
			       sw_if_index0);

      if (PREDICT_FALSE (ip0->ttl == 1))
	{
	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
	  icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
				       ICMP4_time_exceeded_ttl_exceeded_in_transit,
				       0);
	  next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
	  goto trace0;
	}

      proto0 = ip_proto_to_nat_proto (ip0->protocol);

      /* Next configured feature, probably ip4-lookup */
      if (is_slow_path)
	{
	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
	    {
	      if (nat_in2out_sm_unknown_proto (sm, b0, ip0, rx_fib_index0))
		{
		  next0 = SNAT_IN2OUT_NEXT_DROP;
		  b0->error =
		    node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
		}
	      vlib_increment_simple_counter (is_slow_path ? &sm->
					     counters.slowpath.in2out.
					     other : &sm->counters.fastpath.
					     in2out.other, thread_index,
					     sw_if_index0, 1);
	      goto trace0;
	    }

	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
	    {
	      next0 = icmp_in2out_slow_path
		(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
		 next0, now, thread_index, &s0);
	      vlib_increment_simple_counter (is_slow_path ? &sm->
					     counters.slowpath.in2out.
					     icmp : &sm->counters.fastpath.
					     in2out.icmp, thread_index,
					     sw_if_index0, 1);
	      goto trace0;
	    }
	}
      else
	{
	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
	    {
	      next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
	      goto trace0;
	    }

	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
	    {
	      next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
	      goto trace0;
	    }
	}

      init_nat_k (&kv0, ip0->src_address,
		  vnet_buffer (b0)->ip.reass.l4_src_port, rx_fib_index0,
		  proto0);

      if (clib_bihash_search_8_8
	  (&sm->per_thread_data[thread_index].in2out, &kv0, &value0))
	{
	  if (is_slow_path)
	    {
	      if (is_output_feature)
		{
		  if (PREDICT_FALSE
		      (nat_not_translate_output_feature
		       (sm, ip0, proto0,
			vnet_buffer (b0)->ip.reass.l4_src_port,
			vnet_buffer (b0)->ip.reass.l4_dst_port,
			thread_index, sw_if_index0)))
		    goto trace0;

		  /*
		   * Send DHCP packets to the ipv4 stack, or we won't
		   * be able to use dhcp client on the outside interface
		   */
		  if (PREDICT_FALSE
		      (proto0 == NAT_PROTOCOL_UDP
		       && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
			   clib_host_to_net_u16
			   (UDP_DST_PORT_dhcp_to_server))
		       && ip0->dst_address.as_u32 == 0xffffffff))
		    goto trace0;
		}
	      else
		{
		  if (PREDICT_FALSE
		      (snat_not_translate
		       (sm, node, sw_if_index0, ip0, proto0, rx_fib_index0,
			thread_index)))
		    goto trace0;
		}

	      next0 =
		slow_path (sm, b0, ip0, ip0->src_address,
			   vnet_buffer (b0)->ip.reass.l4_src_port,
			   rx_fib_index0, proto0, &s0, node, next0,
			   thread_index, now);

	      if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
		goto trace0;

	      if (PREDICT_FALSE (!s0))
		goto trace0;
	    }
	  else
	    {
	      next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
	      goto trace0;
	    }
	}
      else
	s0 =
	  pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
			     value0.value);

      b0->flags |= VNET_BUFFER_F_IS_NATED;

      old_addr0 = ip0->src_address.as_u32;
      ip0->src_address = s0->out2in.addr;
      new_addr0 = ip0->src_address.as_u32;
      if (!is_output_feature)
	vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;

      sum0 = ip0->checksum;
      sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
			     ip4_header_t, src_address /* changed member */ );
      ip0->checksum = ip_csum_fold (sum0);

      if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
	{
	  if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
	    {
	      old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
	      new_port0 = udp0->src_port = s0->out2in.port;
	      sum0 = tcp0->checksum;
	      sum0 =
		ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
				dst_address /* changed member */ );
	      sum0 =
		ip_csum_update (sum0, old_port0, new_port0,
				ip4_header_t /* cheat */ ,
				length /* changed member */ );
	      mss_clamping (sm->mss_clamping, tcp0, &sum0);
	      tcp0->checksum = ip_csum_fold (sum0);
	    }
	  vlib_increment_simple_counter (is_slow_path ? &sm->
					 counters.slowpath.in2out.tcp : &sm->
					 counters.fastpath.in2out.tcp,
					 thread_index, sw_if_index0, 1);
	}
      else
	{
	  if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
	    {
	      udp0->src_port = s0->out2in.port;
	      if (PREDICT_FALSE (udp0->checksum))
		{
		  old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port;
		  new_port0 = udp0->src_port;
		  sum0 = udp0->checksum;
		  sum0 =
		    ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
				    dst_address /* changed member */ );
		  sum0 =
		    ip_csum_update (sum0, old_port0, new_port0,
				    ip4_header_t /* cheat */ ,
				    length /* changed member */ );
		  udp0->checksum = ip_csum_fold (sum0);
		}
	    }
	  vlib_increment_simple_counter (is_slow_path ? &sm->
					 counters.slowpath.in2out.udp : &sm->
					 counters.fastpath.in2out.udp,
					 thread_index, sw_if_index0, 1);
	}

      /* Accounting */
      nat44_session_update_counters (s0, now,
				     vlib_buffer_length_in_chain (vm, b0),
				     thread_index);
      /* Per-user LRU list maintenance */
      nat44_session_update_lru (sm, s0, thread_index);

    trace0:
      if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
			 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
	{
	  snat_in2out_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
	  t->is_slow_path = is_slow_path;
	  t->sw_if_index = sw_if_index0;
	  t->next_index = next0;
	  t->session_index = ~0;
	  if (s0)
	    t->session_index =
	      s0 - sm->per_thread_data[thread_index].sessions;
	}

      if (next0 == SNAT_IN2OUT_NEXT_DROP)
	{
	  vlib_increment_simple_counter (is_slow_path ? &sm->
					 counters.slowpath.in2out.
					 drops : &sm->counters.fastpath.
					 in2out.drops, thread_index,
					 sw_if_index0, 1);
	}

      n_left_from--;
      next[0] = next0;
      next++;
    }

  vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
			       frame->n_vectors);
  return frame->n_vectors;
}

VLIB_NODE_FN (snat_in2out_node) (vlib_main_t * vm,
				 vlib_node_runtime_t * node,
				 vlib_frame_t * frame)
{
  return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */ ,
				     0);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (snat_in2out_node) = {
  .name = "nat44-in2out",
  .vector_size = sizeof (u32),
  .format_trace = format_snat_in2out_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(snat_in2out_error_strings),
  .error_strings = snat_in2out_error_strings,

  .runtime_data_bytes = sizeof (snat_runtime_t),

  .n_next_nodes = SNAT_IN2OUT_N_NEXT,

  /* edit / add dispositions here */
  .next_nodes = {
    [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
    [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
    [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
    [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
  },
};
/* *INDENT-ON* */

VLIB_NODE_FN (snat_in2out_output_node) (vlib_main_t * vm,
					vlib_node_runtime_t * node,
					vlib_frame_t * frame)
{
  return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */ ,
				     1);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (snat_in2out_output_node) = {
  .name = "nat44-in2out-output",
  .vector_size = sizeof (u32),
  .format_trace = format_snat_in2out_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(snat_in2out_error_strings),
  .error_strings = snat_in2out_error_strings,

  .runtime_data_bytes = sizeof (snat_runtime_t),

  .n_next_nodes = SNAT_IN2OUT_N_NEXT,

  /* edit / add dispositions here */
  .next_nodes = {
    [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
    [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
    [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
    [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
  },
};
/* *INDENT-ON* */

VLIB_NODE_FN (snat_in2out_slowpath_node) (vlib_main_t * vm,
					  vlib_node_runtime_t * node,
					  vlib_frame_t * frame)
{
  return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */ ,
				     0);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = {
  .name = "nat44-in2out-slowpath",
  .vector_size = sizeof (u32),
  .format_trace = format_snat_in2out_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(snat_in2out_error_strings),
  .error_strings = snat_in2out_error_strings,

  .runtime_data_bytes = sizeof (snat_runtime_t),

  .n_next_nodes = SNAT_IN2OUT_N_NEXT,

  /* edit / add dispositions here */
  .next_nodes = {
    [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
    [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
    [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
    [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
  },
};
/* *INDENT-ON* */

VLIB_NODE_FN (snat_in2out_output_slowpath_node) (vlib_main_t * vm,
						 vlib_node_runtime_t * node,
						 vlib_frame_t * frame)
{
  return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */ ,
				     1);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (snat_in2out_output_slowpath_node) = {
  .name = "nat44-in2out-output-slowpath",
  .vector_size = sizeof (u32),
  .format_trace = format_snat_in2out_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(snat_in2out_error_strings),
  .error_strings = snat_in2out_error_strings,

  .runtime_data_bytes = sizeof (snat_runtime_t),

  .n_next_nodes = SNAT_IN2OUT_N_NEXT,

  /* edit / add dispositions here */
  .next_nodes = {
    [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
    [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
    [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
    [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
  },
};
/* *INDENT-ON* */

VLIB_NODE_FN (snat_in2out_fast_node) (vlib_main_t * vm,
				      vlib_node_runtime_t * node,
				      vlib_frame_t * frame)
{
  u32 n_left_from, *from, *to_next;
  snat_in2out_next_t next_index;
  snat_main_t *sm = &snat_main;
  int is_hairpinning = 0;

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  u32 bi0;
	  vlib_buffer_t *b0;
	  u32 next0;
	  u32 sw_if_index0;
	  ip4_header_t *ip0;
	  ip_csum_t sum0;
	  u32 new_addr0, old_addr0;
	  u16 old_port0, new_port0;
	  udp_header_t *udp0;
	  tcp_header_t *tcp0;
	  icmp46_header_t *icmp0;
	  u32 proto0;
	  u32 rx_fib_index0;
	  ip4_address_t sm0_addr;
	  u16 sm0_port;
	  u32 sm0_fib_index;


	  /* speculatively enqueue b0 to the current next frame */
	  bi0 = from[0];
	  to_next[0] = bi0;
	  from += 1;
	  to_next += 1;
	  n_left_from -= 1;
	  n_left_to_next -= 1;

	  b0 = vlib_get_buffer (vm, bi0);
	  next0 = SNAT_IN2OUT_NEXT_LOOKUP;

	  ip0 = vlib_buffer_get_current (b0);
	  udp0 = ip4_next_header (ip0);
	  tcp0 = (tcp_header_t *) udp0;
	  icmp0 = (icmp46_header_t *) udp0;

	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
	  rx_fib_index0 =
	    ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);

	  if (PREDICT_FALSE (ip0->ttl == 1))
	    {
	      vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
	      icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
					   ICMP4_time_exceeded_ttl_exceeded_in_transit,
					   0);
	      next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR;
	      goto trace0;
	    }

	  proto0 = ip_proto_to_nat_proto (ip0->protocol);

	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
	    goto trace0;

	  if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
	    {
	      next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0,
				   rx_fib_index0, node, next0, ~0, 0, 0);
	      goto trace0;
	    }

	  if (snat_static_mapping_match
	      (sm, ip0->src_address, udp0->src_port, rx_fib_index0, proto0,
	       &sm0_addr, &sm0_port, &sm0_fib_index, 0, 0, 0, 0, 0, 0))
	    {
	      b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION];
	      next0 = SNAT_IN2OUT_NEXT_DROP;
	      goto trace0;
	    }

	  new_addr0 = sm0_addr.as_u32;
	  new_port0 = sm0_port;
	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0_fib_index;
	  old_addr0 = ip0->src_address.as_u32;
	  ip0->src_address.as_u32 = new_addr0;

	  sum0 = ip0->checksum;
	  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
				 ip4_header_t,
				 src_address /* changed member */ );
	  ip0->checksum = ip_csum_fold (sum0);

	  if (PREDICT_FALSE (new_port0 != udp0->dst_port))
	    {
	      old_port0 = udp0->src_port;
	      udp0->src_port = new_port0;

	      if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
		{
		  sum0 = tcp0->checksum;
		  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
					 ip4_header_t,
					 dst_address /* changed member */ );
		  sum0 = ip_csum_update (sum0, old_port0, new_port0,
					 ip4_header_t /* cheat */ ,
					 length /* changed member */ );
		  mss_clamping (sm->mss_clamping, tcp0, &sum0);
		  tcp0->checksum = ip_csum_fold (sum0);
		}
	      else if (udp0->checksum)
		{
		  sum0 = udp0->checksum;
		  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
					 ip4_header_t,
					 dst_address /* changed member */ );
		  sum0 = ip_csum_update (sum0, old_port0, new_port0,
					 ip4_header_t /* cheat */ ,
					 length /* changed member */ );
		  udp0->checksum = ip_csum_fold (sum0);
		}
	    }
	  else
	    {
	      if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
		{
		  sum0 = tcp0->checksum;
		  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
					 ip4_header_t,
					 dst_address /* changed member */ );
		  mss_clamping (sm->mss_clamping, tcp0, &sum0);
		  tcp0->checksum = ip_csum_fold (sum0);
		}
	      else if (udp0->checksum)
		{
		  sum0 = udp0->checksum;
		  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
					 ip4_header_t,
					 dst_address /* changed member */ );
		  udp0->checksum = ip_csum_fold (sum0);
		}
	    }

	  /* Hairpinning */
	  snat_hairpinning (vm, node, sm, b0, ip0, udp0, tcp0, proto0, 0,
			    0 /* do_trace */ );
	  is_hairpinning = 1;

	trace0:
	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
	    {
	      snat_in2out_trace_t *t =
		vlib_add_trace (vm, node, b0, sizeof (*t));
	      t->sw_if_index = sw_if_index0;
	      t->next_index = next0;
	      t->is_hairpinning = is_hairpinning;
	    }

	  if (next0 != SNAT_IN2OUT_NEXT_DROP)
	    {

	      vlib_increment_simple_counter (&sm->counters.fastpath.
					     in2out.other, sw_if_index0,
					     vm->thread_index, 1);
	    }

	  /* verify speculative enqueue, maybe switch current next frame */
	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
					   to_next, n_left_to_next,
					   bi0, next0);
	}

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  return frame->n_vectors;
}


/* *INDENT-OFF* */
VLIB_REGISTER_NODE (snat_in2out_fast_node) = {
  .name = "nat44-in2out-fast",
  .vector_size = sizeof (u32),
  .format_trace = format_snat_in2out_fast_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(snat_in2out_error_strings),
  .error_strings = snat_in2out_error_strings,

  .runtime_data_bytes = sizeof (snat_runtime_t),

  .n_next_nodes = SNAT_IN2OUT_N_NEXT,

  /* edit / add dispositions here */
  .next_nodes = {
    [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
    [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
    [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
    [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
  },
};
/* *INDENT-ON* */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */