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path: root/test/test_container.py
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#!/usr/bin/env python
""" Container integration tests """

import unittest
from framework import VppTestCase, VppTestRunner, running_extended_tests
from scapy.layers.l2 import Ether
from scapy.packet import Raw
from scapy.layers.inet import IP, UDP, TCP
from scapy.packet import Packet
from socket import inet_pton, AF_INET, AF_INET6
from scapy.layers.inet6 import IPv6, ICMPv6Unknown, ICMPv6EchoRequest
from scapy.layers.inet6 import ICMPv6EchoReply, IPv6ExtHdrRouting
from scapy.layers.inet6 import IPv6ExtHdrFragment
from pprint import pprint
from random import randint
from util import L4_Conn


class Conn(L4_Conn):
    # for now same as L4_Conn
    pass


@unittest.skipUnless(running_extended_tests, "part of extended tests")
class ContainerIntegrationTestCase(VppTestCase):
    """ Container integration extended testcases """

    @classmethod
    def setUpClass(cls):
        super(ContainerIntegrationTestCase, cls).setUpClass()
        # create pg0 and pg1
        cls.create_pg_interfaces(range(2))
        for i in cls.pg_interfaces:
            i.admin_up()
            i.config_ip4()
            i.config_ip6()
            i.resolve_arp()
            i.resolve_ndp()

    @classmethod
    def tearDownClass(cls):
        super(ContainerIntegrationTestCase, cls).tearDownClass()

    def tearDown(self):
        """Run standard test teardown and log various show commands
        """
        super(ContainerIntegrationTestCase, self).tearDown()
        if not self.vpp_dead:
            self.logger.info(self.vapi.cli("show ip arp"))
            self.logger.info(self.vapi.cli("show ip6 neighbors"))

    def run_basic_conn_test(self, af, acl_side):
        """ Basic connectivity test """
        conn1 = Conn(self, self.pg0, self.pg1, af, UDP, 42001, 4242)
        conn1.send_through(0)
        # the return packets should pass
        conn1.send_through(1)

    def run_negative_conn_test(self, af, acl_side):
        """ Packets with local spoofed address """
        conn1 = Conn(self, self.pg0, self.pg1, af, UDP, 42001, 4242)
        try:
            p2 = conn1.send_through(0).command()
        except:
            # If we asserted while waiting, it's good.
            # the conn should have timed out.
            p2 = None
        self.assert_equal(p2, None, ": packet should have been dropped")

    def test_0010_basic_conn_test(self):
        """ IPv4 basic connectivity test """
        self.run_basic_conn_test(AF_INET, 0)

    def test_0011_basic_conn_test(self):
        """ IPv6 basic connectivity test """
        self.run_basic_conn_test(AF_INET6, 0)

    def test_0050_loopback_prepare_test(self):
        """ Create loopbacks overlapping with remote addresses """
        self.create_loopback_interfaces(2)
        for i in range(2):
            intf = self.lo_interfaces[i]
            intf.admin_up()
            intf._local_ip4 = self.pg_interfaces[i].remote_ip4
            intf._local_ip4_prefix_len = 32
            intf.config_ip4()
            intf._local_ip6 = self.pg_interfaces[i].remote_ip6
            intf._local_ip6_prefix_len = 128
            intf.config_ip6()

    def test_0110_basic_conn_test(self):
        """ IPv4 local-spoof connectivity test """
        self.run_negative_conn_test(AF_INET, 0)

    def test_0111_basic_conn_test(self):
        """ IPv6 local-spoof connectivity test """
        self.run_negative_conn_test(AF_INET, 1)

    def test_0200_basic_conn_test(self):
        """ Configure container commands """
        for i in range(2):
            for addr in [self.pg_interfaces[i].remote_ip4,
                         self.pg_interfaces[i].remote_ip6]:
                self.vapi.ppcli("ip container " + addr + " " +
                                self.pg_interfaces[i].name)
                self.vapi.ppcli("stn rule address " + addr +
                                " interface " + self.pg_interfaces[i].name)

    def test_0210_basic_conn_test(self):
        """ IPv4 test after configuring container """
        self.run_basic_conn_test(AF_INET, 0)

    def test_0211_basic_conn_test(self):
        """ IPv6 test after configuring container """
        self.run_basic_conn_test(AF_INET, 1)

    def test_0300_unconfigure_commands(self):
        """ Unconfigure container commands """
        for i in range(2):
            for addr in [self.pg_interfaces[i].remote_ip4,
                         self.pg_interfaces[i].remote_ip6]:
                self.vapi.ppcli("ip container " + addr + " " +
                                self.pg_interfaces[i].name +
                                " del")
                self.vapi.ppcli("stn rule address " + addr +
                                " interface " + self.pg_interfaces[i].name +
                                " del")

    def test_0410_spoof_test(self):
        """ IPv4 local-spoof after unconfig test """
        self.run_negative_conn_test(AF_INET, 0)

    def test_0411_spoof_test(self):
        """ IPv6 local-spoof after unconfig test """
        self.run_negative_conn_test(AF_INET, 1)
d='n1033' href='#n1033'>1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 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
/*
 * 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.
 */
/*
 * interface.c: VNET interfaces/sub-interfaces
 *
 * 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 <vnet/vnet.h>
#include <vnet/plugin/plugin.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/adj/adj.h>
#include <vnet/adj/adj_mcast.h>
#include <vnet/l2/l2_input.h>

typedef enum vnet_interface_helper_flags_t_
{
  VNET_INTERFACE_SET_FLAGS_HELPER_IS_CREATE = (1 << 0),
  VNET_INTERFACE_SET_FLAGS_HELPER_WANT_REDISTRIBUTE = (1 << 1),
} vnet_interface_helper_flags_t;

static clib_error_t *vnet_hw_interface_set_flags_helper (vnet_main_t * vnm,
							 u32 hw_if_index,
							 vnet_hw_interface_flags_t
							 flags,
							 vnet_interface_helper_flags_t
							 helper_flags);

static clib_error_t *vnet_sw_interface_set_flags_helper (vnet_main_t * vnm,
							 u32 sw_if_index,
							 vnet_sw_interface_flags_t
							 flags,
							 vnet_interface_helper_flags_t
							 helper_flags);

static clib_error_t *vnet_hw_interface_set_class_helper (vnet_main_t * vnm,
							 u32 hw_if_index,
							 u32 hw_class_index,
							 u32 redistribute);

typedef struct
{
  /* Either sw or hw interface index. */
  u32 sw_hw_if_index;

  /* Flags. */
  u32 flags;
} vnet_sw_hw_interface_state_t;

static void
serialize_vec_vnet_sw_hw_interface_state (serialize_main_t * m, va_list * va)
{
  vnet_sw_hw_interface_state_t *s =
    va_arg (*va, vnet_sw_hw_interface_state_t *);
  u32 n = va_arg (*va, u32);
  u32 i;
  for (i = 0; i < n; i++)
    {
      serialize_integer (m, s[i].sw_hw_if_index,
			 sizeof (s[i].sw_hw_if_index));
      serialize_integer (m, s[i].flags, sizeof (s[i].flags));
    }
}

static void
unserialize_vec_vnet_sw_hw_interface_state (serialize_main_t * m,
					    va_list * va)
{
  vnet_sw_hw_interface_state_t *s =
    va_arg (*va, vnet_sw_hw_interface_state_t *);
  u32 n = va_arg (*va, u32);
  u32 i;
  for (i = 0; i < n; i++)
    {
      unserialize_integer (m, &s[i].sw_hw_if_index,
			   sizeof (s[i].sw_hw_if_index));
      unserialize_integer (m, &s[i].flags, sizeof (s[i].flags));
    }
}

static vnet_sw_interface_flags_t
vnet_hw_interface_flags_to_sw (vnet_hw_interface_flags_t hwf)
{
  vnet_sw_interface_flags_t swf = VNET_SW_INTERFACE_FLAG_NONE;

  if (hwf & VNET_HW_INTERFACE_FLAG_LINK_UP)
    swf |= VNET_SW_INTERFACE_FLAG_ADMIN_UP;

  return (swf);
}

void
serialize_vnet_interface_state (serialize_main_t * m, va_list * va)
{
  vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
  vnet_sw_hw_interface_state_t *sts = 0, *st;
  vnet_sw_interface_t *sif;
  vnet_hw_interface_t *hif;
  vnet_interface_main_t *im = &vnm->interface_main;

  /* Serialize hardware interface classes since they may have changed.
     Must do this before sending up/down flags. */
  /* *INDENT-OFF* */
  pool_foreach (hif, im->hw_interfaces, ({
    vnet_hw_interface_class_t * hw_class = vnet_get_hw_interface_class (vnm, hif->hw_class_index);
    serialize_cstring (m, hw_class->name);
  }));
  /* *INDENT-ON* */

  /* Send sw/hw interface state when non-zero. */
  /* *INDENT-OFF* */
  pool_foreach (sif, im->sw_interfaces, ({
    if (sif->flags != 0)
      {
	vec_add2 (sts, st, 1);
	st->sw_hw_if_index = sif->sw_if_index;
	st->flags = sif->flags;
      }
  }));
  /* *INDENT-ON* */

  vec_serialize (m, sts, serialize_vec_vnet_sw_hw_interface_state);

  if (sts)
    _vec_len (sts) = 0;

  /* *INDENT-OFF* */
  pool_foreach (hif, im->hw_interfaces, ({
    if (hif->flags != 0)
      {
	vec_add2 (sts, st, 1);
	st->sw_hw_if_index = hif->hw_if_index;
	st->flags = vnet_hw_interface_flags_to_sw(hif->flags);
      }
  }));
  /* *INDENT-ON* */

  vec_serialize (m, sts, serialize_vec_vnet_sw_hw_interface_state);

  vec_free (sts);
}

static vnet_hw_interface_flags_t
vnet_sw_interface_flags_to_hw (vnet_sw_interface_flags_t swf)
{
  vnet_hw_interface_flags_t hwf = VNET_HW_INTERFACE_FLAG_NONE;

  if (swf & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
    hwf |= VNET_HW_INTERFACE_FLAG_LINK_UP;

  return (hwf);
}

void
unserialize_vnet_interface_state (serialize_main_t * m, va_list * va)
{
  vnet_main_t *vnm = va_arg (*va, vnet_main_t *);
  vnet_sw_hw_interface_state_t *sts = 0, *st;

  /* First set interface hardware class. */
  {
    vnet_interface_main_t *im = &vnm->interface_main;
    vnet_hw_interface_t *hif;
    char *class_name;
    uword *p;
    clib_error_t *error;

    /* *INDENT-OFF* */
    pool_foreach (hif, im->hw_interfaces, ({
      unserialize_cstring (m, &class_name);
      p = hash_get_mem (im->hw_interface_class_by_name, class_name);
      if (p)
        {
          error = vnet_hw_interface_set_class_helper
            (vnm, hif->hw_if_index, p[0], /* redistribute */ 0);
        }
      else
        error = clib_error_return (0, "hw class %s AWOL?", class_name);

      if (error)
	clib_error_report (error);
      vec_free (class_name);
    }));
    /* *INDENT-ON* */
  }

  vec_unserialize (m, &sts, unserialize_vec_vnet_sw_hw_interface_state);
  vec_foreach (st, sts)
    vnet_sw_interface_set_flags_helper (vnm, st->sw_hw_if_index, st->flags,
					/* no distribute */ 0);
  vec_free (sts);

  vec_unserialize (m, &sts, unserialize_vec_vnet_sw_hw_interface_state);
  vec_foreach (st, sts)
  {
    vnet_hw_interface_set_flags_helper
      (vnm, st->sw_hw_if_index, vnet_sw_interface_flags_to_hw (st->flags),
       /* no distribute */ 0);
  }
  vec_free (sts);
}

static clib_error_t *
call_elf_section_interface_callbacks (vnet_main_t * vnm, u32 if_index,
				      u32 flags,
				      _vnet_interface_function_list_elt_t **
				      elts)
{
  _vnet_interface_function_list_elt_t *elt;
  vnet_interface_function_priority_t prio;
  clib_error_t *error = 0;

  for (prio = VNET_ITF_FUNC_PRIORITY_LOW;
       prio <= VNET_ITF_FUNC_PRIORITY_HIGH; prio++)
    {
      elt = elts[prio];

      while (elt)
	{
	  error = elt->fp (vnm, if_index, flags);
	  if (error)
	    return error;
	  elt = elt->next_interface_function;
	}
    }
  return error;
}

static clib_error_t *
call_hw_interface_add_del_callbacks (vnet_main_t * vnm, u32 hw_if_index,
				     u32 is_create)
{
  vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
  vnet_hw_interface_class_t *hw_class =
    vnet_get_hw_interface_class (vnm, hi->hw_class_index);
  vnet_device_class_t *dev_class =
    vnet_get_device_class (vnm, hi->dev_class_index);
  clib_error_t *error = 0;

  if (hw_class->interface_add_del_function
      && (error =
	  hw_class->interface_add_del_function (vnm, hw_if_index, is_create)))
    return error;

  if (dev_class->interface_add_del_function
      && (error =
	  dev_class->interface_add_del_function (vnm, hw_if_index,
						 is_create)))
    return error;

  error = call_elf_section_interface_callbacks
    (vnm, hw_if_index, is_create, vnm->hw_interface_add_del_functions);

  return error;
}

static clib_error_t *
call_sw_interface_add_del_callbacks (vnet_main_t * vnm, u32 sw_if_index,
				     u32 is_create)
{
  return call_elf_section_interface_callbacks
    (vnm, sw_if_index, is_create, vnm->sw_interface_add_del_functions);
}

static clib_error_t *
vnet_hw_interface_set_flags_helper (vnet_main_t * vnm, u32 hw_if_index,
				    vnet_hw_interface_flags_t flags,
				    vnet_interface_helper_flags_t
				    helper_flags)
{
  vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
  vnet_hw_interface_class_t *hw_class =
    vnet_get_hw_interface_class (vnm, hi->hw_class_index);
  u32 mask;
  clib_error_t *error = 0;
  u32 is_create =
    (helper_flags & VNET_INTERFACE_SET_FLAGS_HELPER_IS_CREATE) != 0;

  mask =
    (VNET_HW_INTERFACE_FLAG_LINK_UP | VNET_HW_INTERFACE_FLAG_DUPLEX_MASK);
  flags &= mask;

  /* Call hardware interface add/del callbacks. */
  if (is_create)
    call_hw_interface_add_del_callbacks (vnm, hw_if_index, is_create);

  /* Already in the desired state? */
  if (!is_create && (hi->flags & mask) == flags)
    goto done;

  if ((hi->flags & VNET_HW_INTERFACE_FLAG_LINK_UP) !=
      (flags & VNET_HW_INTERFACE_FLAG_LINK_UP))
    {
      /* Do hardware class (e.g. ethernet). */
      if (hw_class->link_up_down_function
	  && (error = hw_class->link_up_down_function (vnm, hw_if_index,
						       flags)))
	goto done;

      error = call_elf_section_interface_callbacks
	(vnm, hw_if_index, flags, vnm->hw_interface_link_up_down_functions);

      if (error)
	goto done;
    }

  hi->flags &= ~mask;
  hi->flags |= flags;

done:
  return error;
}

static clib_error_t *
vnet_sw_interface_set_flags_helper (vnet_main_t * vnm, u32 sw_if_index,
				    vnet_sw_interface_flags_t flags,
				    vnet_interface_helper_flags_t
				    helper_flags)
{
  vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index);
  u32 mask;
  clib_error_t *error = 0;
  u32 is_create =
    (helper_flags & VNET_INTERFACE_SET_FLAGS_HELPER_IS_CREATE) != 0;
  u32 old_flags;

  mask = VNET_SW_INTERFACE_FLAG_ADMIN_UP | VNET_SW_INTERFACE_FLAG_PUNT;
  flags &= mask;

  if (is_create)
    {
      error =
	call_sw_interface_add_del_callbacks (vnm, sw_if_index, is_create);
      if (error)
	goto done;

      if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
	{
	  /* Notify everyone when the interface is created as admin up */
	  error = call_elf_section_interface_callbacks (vnm, sw_if_index,
							flags,
							vnm->
							sw_interface_admin_up_down_functions);
	  if (error)
	    goto done;
	}
    }
  else
    {
      vnet_sw_interface_t *si_sup = si;

      /* Check that super interface is in correct state. */
      if (si->type == VNET_SW_INTERFACE_TYPE_SUB)
	{
	  si_sup = vnet_get_sw_interface (vnm, si->sup_sw_if_index);

	  /* Check to see if we're bringing down the soft interface and if it's parent is up */
	  if ((flags != (si_sup->flags & mask)) &&
	      (!((flags == 0)
		 && ((si_sup->flags & mask) ==
		     VNET_SW_INTERFACE_FLAG_ADMIN_UP))))
	    {
	      error = clib_error_return (0, "super-interface %U must be %U",
					 format_vnet_sw_interface_name, vnm,
					 si_sup,
					 format_vnet_sw_interface_flags,
					 flags);
	      goto done;
	    }
	}

      /* Already in the desired state? */
      if ((si->flags & mask) == flags)
	goto done;

      /* Sub-interfaces of hardware interfaces that do no redistribute,
         do not redistribute themselves. */
      if (si_sup->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
	{
	  vnet_hw_interface_t *hi =
	    vnet_get_hw_interface (vnm, si_sup->hw_if_index);
	  vnet_device_class_t *dev_class =
	    vnet_get_device_class (vnm, hi->dev_class_index);
	  if (!dev_class->redistribute)
	    helper_flags &=
	      ~VNET_INTERFACE_SET_FLAGS_HELPER_WANT_REDISTRIBUTE;
	}

      /* set the flags now before invoking the registered clients
       * so that the state they query is consistent with the state here notified */
      old_flags = si->flags;
      si->flags &= ~mask;
      si->flags |= flags;
      if ((flags | old_flags) & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
	error = call_elf_section_interface_callbacks
	  (vnm, sw_if_index, flags,
	   vnm->sw_interface_admin_up_down_functions);

      if (error)
	{
	  /* restore flags on error */
	  si->flags = old_flags;
	  goto done;
	}

      if (si->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
	{
	  vnet_hw_interface_t *hi =
	    vnet_get_hw_interface (vnm, si->hw_if_index);
	  vnet_hw_interface_class_t *hw_class =
	    vnet_get_hw_interface_class (vnm, hi->hw_class_index);
	  vnet_device_class_t *dev_class =
	    vnet_get_device_class (vnm, hi->dev_class_index);

	  if ((flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) &&
	      (si->flags & VNET_SW_INTERFACE_FLAG_ERROR))
	    {
	      error = clib_error_return (0, "Interface in the error state");
	      goto done;
	    }

	  /* save the si admin up flag */
	  old_flags = si->flags;

	  /* update si admin up flag in advance if we are going admin down */
	  if (!(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
	    si->flags &= ~VNET_SW_INTERFACE_FLAG_ADMIN_UP;

	  if (dev_class->admin_up_down_function
	      && (error = dev_class->admin_up_down_function (vnm,
							     si->hw_if_index,
							     flags)))
	    {
	      /* restore si admin up flag to it's original state on errors */
	      si->flags = old_flags;
	      goto done;
	    }

	  if (hw_class->admin_up_down_function
	      && (error = hw_class->admin_up_down_function (vnm,
							    si->hw_if_index,
							    flags)))
	    {
	      /* restore si admin up flag to it's original state on errors */
	      si->flags = old_flags;
	      goto done;
	    }

	  /* Admin down implies link down. */
	  if (!(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
	      && (hi->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))
	    vnet_hw_interface_set_flags_helper (vnm, si->hw_if_index,
						hi->flags &
						~VNET_HW_INTERFACE_FLAG_LINK_UP,
						helper_flags);
	}
    }

  si->flags &= ~mask;
  si->flags |= flags;

done:
  return error;
}

clib_error_t *
vnet_hw_interface_set_flags (vnet_main_t * vnm, u32 hw_if_index,
			     vnet_hw_interface_flags_t flags)
{
  return vnet_hw_interface_set_flags_helper
    (vnm, hw_if_index, flags,
     VNET_INTERFACE_SET_FLAGS_HELPER_WANT_REDISTRIBUTE);
}

clib_error_t *
vnet_sw_interface_set_flags (vnet_main_t * vnm, u32 sw_if_index,
			     vnet_sw_interface_flags_t flags)
{
  return vnet_sw_interface_set_flags_helper
    (vnm, sw_if_index, flags,
     VNET_INTERFACE_SET_FLAGS_HELPER_WANT_REDISTRIBUTE);
}

void
vnet_sw_interface_admin_up (vnet_main_t * vnm, u32 sw_if_index)
{
  u32 flags = vnet_sw_interface_get_flags (vnm, sw_if_index);

  if (!(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
    {
      flags |= VNET_SW_INTERFACE_FLAG_ADMIN_UP;
      vnet_sw_interface_set_flags (vnm, sw_if_index, flags);
    }
}

void
vnet_sw_interface_admin_down (vnet_main_t * vnm, u32 sw_if_index)
{
  u32 flags = vnet_sw_interface_get_flags (vnm, sw_if_index);

  if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
    {
      flags &= ~(VNET_SW_INTERFACE_FLAG_ADMIN_UP);
      vnet_sw_interface_set_flags (vnm, sw_if_index, flags);
    }
}

static u32
vnet_create_sw_interface_no_callbacks (vnet_main_t * vnm,
				       vnet_sw_interface_t * template)
{
  vnet_interface_main_t *im = &vnm->interface_main;
  vnet_sw_interface_t *sw;
  u32 sw_if_index;

  pool_get (im->sw_interfaces, sw);
  sw_if_index = sw - im->sw_interfaces;

  sw[0] = template[0];

  sw->flags = 0;
  sw->sw_if_index = sw_if_index;
  if (sw->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
    sw->sup_sw_if_index = sw->sw_if_index;

  /* Allocate counters for this interface. */
  {
    u32 i;

    vnet_interface_counter_lock (im);

    for (i = 0; i < vec_len (im->sw_if_counters); i++)
      {
	vlib_validate_simple_counter (&im->sw_if_counters[i], sw_if_index);
	vlib_zero_simple_counter (&im->sw_if_counters[i], sw_if_index);
      }

    for (i = 0; i < vec_len (im->combined_sw_if_counters); i++)
      {
	vlib_validate_combined_counter (&im->combined_sw_if_counters[i],
					sw_if_index);
	vlib_zero_combined_counter (&im->combined_sw_if_counters[i],
				    sw_if_index);
      }

    vnet_interface_counter_unlock (im);
  }

  return sw_if_index;
}

clib_error_t *
vnet_create_sw_interface (vnet_main_t * vnm, vnet_sw_interface_t * template,
			  u32 * sw_if_index)
{
  clib_error_t *error;
  vnet_hw_interface_t *hi;
  vnet_device_class_t *dev_class;

  if (template->sub.eth.flags.two_tags == 1
      && template->sub.eth.flags.exact_match == 1
      && (template->sub.eth.flags.inner_vlan_id_any == 1
	  || template->sub.eth.flags.outer_vlan_id_any == 1))
    {
      error = clib_error_return (0,
				 "inner-dot1q any exact-match is unsupported");
      return error;
    }

  hi = vnet_get_sup_hw_interface (vnm, template->sup_sw_if_index);
  dev_class = vnet_get_device_class (vnm, hi->dev_class_index);

  if (template->type == VNET_SW_INTERFACE_TYPE_SUB &&
      dev_class->subif_add_del_function)
    {
      error = dev_class->subif_add_del_function (vnm, hi->hw_if_index,
						 (struct vnet_sw_interface_t
						  *) template, 1);
      if (error)
	return error;
    }

  *sw_if_index = vnet_create_sw_interface_no_callbacks (vnm, template);
  error = vnet_sw_interface_set_flags_helper
    (vnm, *sw_if_index, template->flags,
     VNET_INTERFACE_SET_FLAGS_HELPER_IS_CREATE);

  if (error)
    {
      /* undo the work done by vnet_create_sw_interface_no_callbacks() */
      vnet_interface_main_t *im = &vnm->interface_main;
      vnet_sw_interface_t *sw =
	pool_elt_at_index (im->sw_interfaces, *sw_if_index);
      pool_put (im->sw_interfaces, sw);
    }

  return error;
}

void
vnet_delete_sw_interface (vnet_main_t * vnm, u32 sw_if_index)
{
  vnet_interface_main_t *im = &vnm->interface_main;
  vnet_sw_interface_t *sw =
    pool_elt_at_index (im->sw_interfaces, sw_if_index);

  /* Check if the interface has config and is removed from L2 BD or XConnect */
  vlib_main_t *vm = vlib_get_main ();
  l2_input_config_t *config;
  if (sw_if_index < vec_len (l2input_main.configs))
    {
      config = vec_elt_at_index (l2input_main.configs, sw_if_index);
      if (config->xconnect)
	set_int_l2_mode (vm, vnm, MODE_L3, config->output_sw_if_index, 0,
			 L2_BD_PORT_TYPE_NORMAL, 0, 0);
      if (config->xconnect || config->bridge)
	set_int_l2_mode (vm, vnm, MODE_L3, sw_if_index, 0,
			 L2_BD_PORT_TYPE_NORMAL, 0, 0);
    }
  vnet_clear_sw_interface_tag (vnm, sw_if_index);

  /* Bring down interface in case it is up. */
  if (sw->flags != 0)
    vnet_sw_interface_set_flags (vnm, sw_if_index, /* flags */ 0);

  call_sw_interface_add_del_callbacks (vnm, sw_if_index, /* is_create */ 0);

  pool_put (im->sw_interfaces, sw);
}

static clib_error_t *
call_sw_interface_mtu_change_callbacks (vnet_main_t * vnm, u32 sw_if_index)
{
  return call_elf_section_interface_callbacks
    (vnm, sw_if_index, 0, vnm->sw_interface_mtu_change_functions);
}

void
vnet_sw_interface_set_mtu (vnet_main_t * vnm, u32 sw_if_index, u32 mtu)
{
  vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index);

  if (si->mtu[VNET_MTU_L3] != mtu)
    {
      si->mtu[VNET_MTU_L3] = mtu;
      call_sw_interface_mtu_change_callbacks (vnm, sw_if_index);
    }
}

void
vnet_sw_interface_set_protocol_mtu (vnet_main_t * vnm, u32 sw_if_index,
				    u32 mtu[])
{
  vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index);
  bool changed = false;
  int i;

  for (i = 0; i < VNET_N_MTU; i++)
    {
      if (si->mtu[i] != mtu[i])
	{
	  si->mtu[i] = mtu[i];
	  changed = true;
	}
    }
  /* Notify interested parties */
  if (changed)
    call_sw_interface_mtu_change_callbacks (vnm, sw_if_index);
}

void
vnet_sw_interface_ip_directed_broadcast (vnet_main_t * vnm,
					 u32 sw_if_index, u8 enable)
{
  vnet_sw_interface_t *si;

  si = vnet_get_sw_interface (vnm, sw_if_index);

  if (enable)
    si->flags |= VNET_SW_INTERFACE_FLAG_DIRECTED_BCAST;
  else
    si->flags &= ~VNET_SW_INTERFACE_FLAG_DIRECTED_BCAST;

  ip4_directed_broadcast (sw_if_index, enable);
}

/*
 * Reflect a change in hardware MTU on protocol MTUs
 */
static walk_rc_t
sw_interface_walk_callback (vnet_main_t * vnm, u32 sw_if_index, void *ctx)
{
  u32 *link_mtu = ctx;
  vnet_sw_interface_set_mtu (vnm, sw_if_index, *link_mtu);
  return WALK_CONTINUE;
}

void
vnet_hw_interface_set_mtu (vnet_main_t * vnm, u32 hw_if_index, u32 mtu)
{
  vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);

  if (hi->max_packet_bytes != mtu)
    {
      hi->max_packet_bytes = mtu;
      ethernet_set_flags (vnm, hw_if_index, ETHERNET_INTERFACE_FLAG_MTU);
      vnet_hw_interface_walk_sw (vnm, hw_if_index, sw_interface_walk_callback,
				 &mtu);
    }
}

static void
setup_tx_node (vlib_main_t * vm,
	       u32 node_index, vnet_device_class_t * dev_class)
{
  vlib_node_t *n = vlib_get_node (vm, node_index);

  n->function = dev_class->tx_function;
  n->format_trace = dev_class->format_tx_trace;

  vlib_register_errors (vm, node_index,
			dev_class->tx_function_n_errors,
			dev_class->tx_function_error_strings);
}

static void
setup_output_node (vlib_main_t * vm,
		   u32 node_index, vnet_hw_interface_class_t * hw_class)
{
  vlib_node_t *n = vlib_get_node (vm, node_index);
  n->format_buffer = hw_class->format_header;
  n->unformat_buffer = hw_class->unformat_header;
}

/* Register an interface instance. */
u32
vnet_register_interface (vnet_main_t * vnm,
			 u32 dev_class_index,
			 u32 dev_instance,
			 u32 hw_class_index, u32 hw_instance)
{
  vnet_interface_main_t *im = &vnm->interface_main;
  vnet_hw_interface_t *hw;
  vnet_device_class_t *dev_class =
    vnet_get_device_class (vnm, dev_class_index);
  vnet_hw_interface_class_t *hw_class =
    vnet_get_hw_interface_class (vnm, hw_class_index);
  vlib_main_t *vm = vnm->vlib_main;
  vnet_feature_config_main_t *fcm;
  vnet_config_main_t *cm;
  u32 hw_index, i;
  char *tx_node_name = NULL, *output_node_name = NULL;

  pool_get (im->hw_interfaces, hw);
  clib_memset (hw, 0, sizeof (*hw));
  hw->trace_classify_table_index = ~0;

  hw_index = hw - im->hw_interfaces;
  hw->hw_if_index = hw_index;
  hw->default_rx_mode = VNET_HW_INTERFACE_RX_MODE_POLLING;

  if (dev_class->format_device_name)
    hw->name = format (0, "%U", dev_class->format_device_name, dev_instance);
  else if (hw_class->format_interface_name)
    hw->name = format (0, "%U", hw_class->format_interface_name,
		       dev_instance);
  else
    hw->name = format (0, "%s%x", hw_class->name, dev_instance);

  if (!im->hw_interface_by_name)
    im->hw_interface_by_name = hash_create_vec ( /* size */ 0,
						sizeof (hw->name[0]),
						sizeof (uword));

  hash_set_mem (im->hw_interface_by_name, hw->name, hw_index);

  /* Make hardware interface point to software interface. */
  {
    vnet_sw_interface_t sw = {
      .type = VNET_SW_INTERFACE_TYPE_HARDWARE,
      .flood_class = VNET_FLOOD_CLASS_NORMAL,
      .hw_if_index = hw_index
    };
    hw->sw_if_index = vnet_create_sw_interface_no_callbacks (vnm, &sw);
  }

  hw->dev_class_index = dev_class_index;
  hw->dev_instance = dev_instance;
  hw->hw_class_index = hw_class_index;
  hw->hw_instance = hw_instance;

  hw->max_rate_bits_per_sec = 0;
  hw->min_packet_bytes = 0;
  vnet_sw_interface_set_mtu (vnm, hw->sw_if_index, 0);

  if (dev_class->tx_function == 0)
    goto no_output_nodes;	/* No output/tx nodes to create */

  tx_node_name = (char *) format (0, "%v-tx", hw->name);
  output_node_name = (char *) format (0, "%v-output", hw->name);

  /* If we have previously deleted interface nodes, re-use them. */
  if (vec_len (im->deleted_hw_interface_nodes) > 0)
    {
      vnet_hw_interface_nodes_t *hn;
      vlib_node_t *node;
      vlib_node_runtime_t *nrt;

      hn = vec_end (im->deleted_hw_interface_nodes) - 1;

      hw->tx_node_index = hn->tx_node_index;
      hw->output_node_index = hn->output_node_index;

      vlib_node_rename (vm, hw->tx_node_index, "%v", tx_node_name);
      vlib_node_rename (vm, hw->output_node_index, "%v", output_node_name);

      /* *INDENT-OFF* */
      foreach_vlib_main ({
        vnet_interface_output_runtime_t *rt;

	rt = vlib_node_get_runtime_data (this_vlib_main, hw->output_node_index);
	ASSERT (rt->is_deleted == 1);
	rt->is_deleted = 0;
	rt->hw_if_index = hw_index;
	rt->sw_if_index = hw->sw_if_index;
	rt->dev_instance = hw->dev_instance;

	rt = vlib_node_get_runtime_data (this_vlib_main, hw->tx_node_index);
	rt->hw_if_index = hw_index;
	rt->sw_if_index = hw->sw_if_index;
	rt->dev_instance = hw->dev_instance;
      });
      /* *INDENT-ON* */

      /* The new class may differ from the old one.
       * Functions have to be updated. */
      node = vlib_get_node (vm, hw->output_node_index);
      node->function = vnet_interface_output_node;
      node->format_trace = format_vnet_interface_output_trace;
      /* *INDENT-OFF* */
      foreach_vlib_main ({
        nrt = vlib_node_get_runtime (this_vlib_main, hw->output_node_index);
        nrt->function = node->function;
      });
      /* *INDENT-ON* */

      node = vlib_get_node (vm, hw->tx_node_index);
      node->function = dev_class->tx_function;
      node->format_trace = dev_class->format_tx_trace;
      /* *INDENT-OFF* */
      foreach_vlib_main ({
        nrt = vlib_node_get_runtime (this_vlib_main, hw->tx_node_index);
        nrt->function = node->function;
      });
      /* *INDENT-ON* */

      _vec_len (im->deleted_hw_interface_nodes) -= 1;
    }
  else
    {
      vlib_node_registration_t r;
      vnet_interface_output_runtime_t rt = {
	.hw_if_index = hw_index,
	.sw_if_index = hw->sw_if_index,
	.dev_instance = hw->dev_instance,
	.is_deleted = 0,
      };

      clib_memset (&r, 0, sizeof (r));
      r.type = VLIB_NODE_TYPE_INTERNAL;
      r.runtime_data = &rt;
      r.runtime_data_bytes = sizeof (rt);
      r.scalar_size = 0;
      r.vector_size = sizeof (u32);

      r.flags = VLIB_NODE_FLAG_IS_OUTPUT;
      r.name = tx_node_name;
      r.function = dev_class->tx_function;

      hw->tx_node_index = vlib_register_node (vm, &r);

      vlib_node_add_named_next_with_slot (vm, hw->tx_node_index,
					  "error-drop",
					  VNET_INTERFACE_TX_NEXT_DROP);

      r.flags = 0;
      r.name = output_node_name;
      r.function = vnet_interface_output_node;
      r.format_trace = format_vnet_interface_output_trace;

      {
	static char *e[] = {
	  "interface is down",
	  "interface is deleted",
	  "no buffers to segment GSO",
	};

	r.n_errors = ARRAY_LEN (e);
	r.error_strings = e;
      }
      hw->output_node_index = vlib_register_node (vm, &r);

      vlib_node_add_named_next_with_slot (vm, hw->output_node_index,
					  "error-drop",
					  VNET_INTERFACE_OUTPUT_NEXT_DROP);
      vlib_node_add_next_with_slot (vm, hw->output_node_index,
				    hw->tx_node_index,
				    VNET_INTERFACE_OUTPUT_NEXT_TX);

      /* add interface to the list of "output-interface" feature arc start nodes
         and clone nexts from 1st interface if it exists */
      fcm = vnet_feature_get_config_main (im->output_feature_arc_index);
      cm = &fcm->config_main;
      i = vec_len (cm->start_node_indices);
      vec_validate (cm->start_node_indices, i);
      cm->start_node_indices[i] = hw->output_node_index;
      if (hw_index)
	{
	  /* copy nexts from 1st interface */
	  vnet_hw_interface_t *first_hw;
	  vlib_node_t *first_node;

	  first_hw = vnet_get_hw_interface (vnm, /* hw_if_index */ 0);
	  first_node = vlib_get_node (vm, first_hw->output_node_index);

	  /* 1st 2 nexts are already added above */
	  for (i = 2; i < vec_len (first_node->next_nodes); i++)
	    vlib_node_add_next_with_slot (vm, hw->output_node_index,
					  first_node->next_nodes[i], i);
	}
    }

  setup_output_node (vm, hw->output_node_index, hw_class);
  setup_tx_node (vm, hw->tx_node_index, dev_class);

no_output_nodes:
  /* Call all up/down callbacks with zero flags when interface is created. */
  vnet_sw_interface_set_flags_helper (vnm, hw->sw_if_index, /* flags */ 0,
				      VNET_INTERFACE_SET_FLAGS_HELPER_IS_CREATE);
  vnet_hw_interface_set_flags_helper (vnm, hw_index, /* flags */ 0,
				      VNET_INTERFACE_SET_FLAGS_HELPER_IS_CREATE);
  vec_free (tx_node_name);
  vec_free (output_node_name);

  return hw_index;
}

void
vnet_delete_hw_interface (vnet_main_t * vnm, u32 hw_if_index)
{
  vnet_interface_main_t *im = &vnm->interface_main;
  vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
  vlib_main_t *vm = vnm->vlib_main;
  vnet_device_class_t *dev_class = vnet_get_device_class (vnm,
							  hw->dev_class_index);
  /* If it is up, mark it down. */
  if (hw->flags != 0)
    vnet_hw_interface_set_flags (vnm, hw_if_index, /* flags */ 0);

  /* Call delete callbacks. */
  call_hw_interface_add_del_callbacks (vnm, hw_if_index, /* is_create */ 0);

  /* Delete any sub-interfaces. */
  {
    u32 id, sw_if_index;
    /* *INDENT-OFF* */
    hash_foreach (id, sw_if_index, hw->sub_interface_sw_if_index_by_id,
    ({
      vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index);
      u64 sup_and_sub_key =
	((u64) (si->sup_sw_if_index) << 32) | (u64) si->sub.id;
      hash_unset_mem_free (&im->sw_if_index_by_sup_and_sub, &sup_and_sub_key);
      vnet_delete_sw_interface (vnm, sw_if_index);
    }));
    hash_free (hw->sub_interface_sw_if_index_by_id);
    /* *INDENT-ON* */
  }

  /* Delete software interface corresponding to hardware interface. */
  vnet_delete_sw_interface (vnm, hw->sw_if_index);

  if (dev_class->tx_function)
    {
      /* Put output/tx nodes into recycle pool */
      vnet_hw_interface_nodes_t *dn;

      /* *INDENT-OFF* */
      foreach_vlib_main
	({
	  vnet_interface_output_runtime_t *rt =
	    vlib_node_get_runtime_data (this_vlib_main, hw->output_node_index);

	  /* Mark node runtime as deleted so output node (if called)
	   * will drop packets. */
	  rt->is_deleted = 1;
	});
      /* *INDENT-ON* */

      vlib_node_rename (vm, hw->output_node_index,
			"interface-%d-output-deleted", hw_if_index);
      vlib_node_rename (vm, hw->tx_node_index, "interface-%d-tx-deleted",
			hw_if_index);
      vec_add2 (im->deleted_hw_interface_nodes, dn, 1);
      dn->tx_node_index = hw->tx_node_index;
      dn->output_node_index = hw->output_node_index;
    }

  hash_unset_mem (im->hw_interface_by_name, hw->name);
  vec_free (hw->name);
  vec_free (hw->hw_address);
  vec_free (hw->input_node_thread_index_by_queue);
  vec_free (hw->dq_runtime_index_by_queue);

  pool_put (im->hw_interfaces, hw);
}

void
vnet_hw_interface_walk_sw (vnet_main_t * vnm,
			   u32 hw_if_index,
			   vnet_hw_sw_interface_walk_t fn, void *ctx)
{
  vnet_hw_interface_t *hi;
  u32 id, sw_if_index;

  hi = vnet_get_hw_interface (vnm, hw_if_index);
  /* the super first, then the sub interfaces */
  if (WALK_STOP == fn (vnm, hi->sw_if_index, ctx))
    return;

  /* *INDENT-OFF* */
  hash_foreach (id, sw_if_index,
                hi->sub_interface_sw_if_index_by_id,
  ({
    if (WALK_STOP == fn (vnm, sw_if_index, ctx))
      break;
  }));
  /* *INDENT-ON* */
}

void
vnet_hw_interface_walk (vnet_main_t * vnm,
			vnet_hw_interface_walk_t fn, void *ctx)
{
  vnet_interface_main_t *im;
  vnet_hw_interface_t *hi;

  im = &vnm->interface_main;

  /* *INDENT-OFF* */
  pool_foreach (hi, im->hw_interfaces,
  ({
    if (WALK_STOP == fn(vnm, hi->hw_if_index, ctx))
      break;
  }));
  /* *INDENT-ON* */
}

void
vnet_sw_interface_walk (vnet_main_t * vnm,
			vnet_sw_interface_walk_t fn, void *ctx)
{
  vnet_interface_main_t *im;
  vnet_sw_interface_t *si;

  im = &vnm->interface_main;

  /* *INDENT-OFF* */
  pool_foreach (si, im->sw_interfaces,
  {
    if (WALK_STOP == fn (vnm, si, ctx))
      break;
  });
  /* *INDENT-ON* */
}

void
vnet_hw_interface_init_for_class (vnet_main_t * vnm, u32 hw_if_index,
				  u32 hw_class_index, u32 hw_instance)
{
  vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
  vnet_hw_interface_class_t *hc =
    vnet_get_hw_interface_class (vnm, hw_class_index);

  hi->hw_class_index = hw_class_index;
  hi->hw_instance = hw_instance;
  setup_output_node (vnm->vlib_main, hi->output_node_index, hc);
}

static clib_error_t *
vnet_hw_interface_set_class_helper (vnet_main_t * vnm, u32 hw_if_index,
				    u32 hw_class_index, u32 redistribute)
{
  vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
  vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, hi->sw_if_index);
  vnet_hw_interface_class_t *old_class =
    vnet_get_hw_interface_class (vnm, hi->hw_class_index);
  vnet_hw_interface_class_t *new_class =
    vnet_get_hw_interface_class (vnm, hw_class_index);
  vnet_device_class_t *dev_class =
    vnet_get_device_class (vnm, hi->dev_class_index);
  clib_error_t *error = 0;

  /* New class equals old class?  Nothing to do. */
  if (hi->hw_class_index == hw_class_index)
    return 0;

  /* No need (and incorrect since admin up flag may be set) to do error checking when
     receiving unserialize message. */
  if (redistribute)
    {
      if (si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
	return clib_error_return (0,
				  "%v must be admin down to change class from %s to %s",
				  hi->name, old_class->name, new_class->name);

      /* Make sure interface supports given class. */
      if ((new_class->is_valid_class_for_interface
	   && !new_class->is_valid_class_for_interface (vnm, hw_if_index,
							hw_class_index))
	  || (dev_class->is_valid_class_for_interface
	      && !dev_class->is_valid_class_for_interface (vnm, hw_if_index,
							   hw_class_index)))
	return clib_error_return (0,
				  "%v class cannot be changed from %s to %s",
				  hi->name, old_class->name, new_class->name);

    }

  if (old_class->hw_class_change)
    old_class->hw_class_change (vnm, hw_if_index, old_class->index,
				new_class->index);

  vnet_hw_interface_init_for_class (vnm, hw_if_index, new_class->index,
				    /* instance */ ~0);

  if (new_class->hw_class_change)
    new_class->hw_class_change (vnm, hw_if_index, old_class->index,
				new_class->index);

  if (dev_class->hw_class_change)
    dev_class->hw_class_change (vnm, hw_if_index, new_class->index);

  return error;
}

clib_error_t *
vnet_hw_interface_set_class (vnet_main_t * vnm, u32 hw_if_index,
			     u32 hw_class_index)
{
  return vnet_hw_interface_set_class_helper (vnm, hw_if_index, hw_class_index,
					     /* redistribute */ 1);
}

static int
vnet_hw_interface_rx_redirect_to_node_helper (vnet_main_t * vnm,
					      u32 hw_if_index,
					      u32 node_index,
					      u32 redistribute)
{
  vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
  vnet_device_class_t *dev_class = vnet_get_device_class
    (vnm, hi->dev_class_index);

  if (dev_class->rx_redirect_to_node)
    {
      dev_class->rx_redirect_to_node (vnm, hw_if_index, node_index);
      return 0;
    }

  return VNET_API_ERROR_UNIMPLEMENTED;
}

int
vnet_hw_interface_rx_redirect_to_node (vnet_main_t * vnm, u32 hw_if_index,
				       u32 node_index)
{
  return vnet_hw_interface_rx_redirect_to_node_helper (vnm, hw_if_index,
						       node_index,
						       1 /* redistribute */ );
}

word
vnet_sw_interface_compare (vnet_main_t * vnm,
			   uword sw_if_index0, uword sw_if_index1)
{
  vnet_sw_interface_t *sup0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
  vnet_sw_interface_t *sup1 = vnet_get_sup_sw_interface (vnm, sw_if_index1);
  vnet_hw_interface_t *h0 = vnet_get_hw_interface (vnm, sup0->hw_if_index);
  vnet_hw_interface_t *h1 = vnet_get_hw_interface (vnm, sup1->hw_if_index);

  if (h0 != h1)
    return vec_cmp (h0->name, h1->name);
  return (word) h0->hw_instance - (word) h1->hw_instance;
}

word
vnet_hw_interface_compare (vnet_main_t * vnm,
			   uword hw_if_index0, uword hw_if_index1)
{
  vnet_hw_interface_t *h0 = vnet_get_hw_interface (vnm, hw_if_index0);
  vnet_hw_interface_t *h1 = vnet_get_hw_interface (vnm, hw_if_index1);

  if (h0 != h1)
    return vec_cmp (h0->name, h1->name);
  return (word) h0->hw_instance - (word) h1->hw_instance;
}

int
vnet_sw_interface_is_p2p (vnet_main_t * vnm, u32 sw_if_index)
{
  vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index);
  if ((si->type == VNET_SW_INTERFACE_TYPE_P2P) ||
      (si->type == VNET_SW_INTERFACE_TYPE_PIPE))
    return 1;

  vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
  vnet_hw_interface_class_t *hc =
    vnet_get_hw_interface_class (vnm, hw->hw_class_index);

  return (hc->flags & VNET_HW_INTERFACE_CLASS_FLAG_P2P);
}

int
vnet_sw_interface_is_nbma (vnet_main_t * vnm, u32 sw_if_index)
{
  vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
  vnet_hw_interface_class_t *hc =
    vnet_get_hw_interface_class (vnm, hw->hw_class_index);

  return (hc->flags & VNET_HW_INTERFACE_CLASS_FLAG_NBMA);
}

clib_error_t *
vnet_interface_init (vlib_main_t * vm)
{
  vnet_main_t *vnm = vnet_get_main ();
  vnet_interface_main_t *im = &vnm->interface_main;
  vlib_buffer_t *b = 0;
  vnet_buffer_opaque_t *o = 0;
  clib_error_t *error;

  /*
   * Keep people from shooting themselves in the foot.
   */
  if (sizeof (b->opaque) != sizeof (vnet_buffer_opaque_t))
    {
#define _(a) if (sizeof(o->a) > sizeof (o->unused))                     \
      clib_warning                                                      \
        ("FATAL: size of opaque union subtype %s is %d (max %d)",       \
         #a, sizeof(o->a), sizeof (o->unused));
      foreach_buffer_opaque_union_subtype;
#undef _

      return clib_error_return
	(0, "FATAL: size of vlib buffer opaque %d, size of vnet opaque %d",
	 sizeof (b->opaque), sizeof (vnet_buffer_opaque_t));
    }

  clib_spinlock_init (&im->sw_if_counter_lock);
  clib_spinlock_lock (&im->sw_if_counter_lock);	/* should be no need */

  vec_validate (im->sw_if_counters, VNET_N_SIMPLE_INTERFACE_COUNTER - 1);
#define _(E,n,p)							\
  im->sw_if_counters[VNET_INTERFACE_COUNTER_##E].name = #n;		\
  im->sw_if_counters[VNET_INTERFACE_COUNTER_##E].stat_segment_name = "/" #p "/" #n;
  foreach_simple_interface_counter_name
#undef _
    vec_validate (im->combined_sw_if_counters,
		  VNET_N_COMBINED_INTERFACE_COUNTER - 1);
#define _(E,n,p)							\
  im->combined_sw_if_counters[VNET_INTERFACE_COUNTER_##E].name = #n;	\
  im->combined_sw_if_counters[VNET_INTERFACE_COUNTER_##E].stat_segment_name = "/" #p "/" #n;
  foreach_combined_interface_counter_name
#undef _
    clib_spinlock_unlock (&im->sw_if_counter_lock);

  im->device_class_by_name = hash_create_string ( /* size */ 0,
						 sizeof (uword));
  {
    vnet_device_class_t *c;

    c = vnm->device_class_registrations;

    while (c)
      {
	c->index = vec_len (im->device_classes);
	hash_set_mem (im->device_class_by_name, c->name, c->index);

	if (c->tx_fn_registrations)
	  {
	    vlib_node_fn_registration_t *fnr = c->tx_fn_registrations;
	    int priority = -1;

	    /* to avoid confusion, please remove ".tx_function" statement
	       from VNET_DEVICE_CLASS() if using function candidates */
	    ASSERT (c->tx_function == 0);

	    while (fnr)
	      {
		if (fnr->priority > priority)
		  {
		    priority = fnr->priority;
		    c->tx_function = fnr->function;
		  }
		fnr = fnr->next_registration;
	      }
	  }

	vec_add1 (im->device_classes, c[0]);
	c = c->next_class_registration;
      }
  }

  im->hw_interface_class_by_name = hash_create_string ( /* size */ 0,
						       sizeof (uword));

  im->sw_if_index_by_sup_and_sub = hash_create_mem (0, sizeof (u64),
						    sizeof (uword));
  {
    vnet_hw_interface_class_t *c;

    c = vnm->hw_interface_class_registrations;

    while (c)
      {
	c->index = vec_len (im->hw_interface_classes);
	hash_set_mem (im->hw_interface_class_by_name, c->name, c->index);

	if (NULL == c->build_rewrite)
	  c->build_rewrite = default_build_rewrite;
	if (NULL == c->update_adjacency)
	  c->update_adjacency = default_update_adjacency;

	vec_add1 (im->hw_interface_classes, c[0]);
	c = c->next_class_registration;
      }
  }

  /* init per-thread data */
  vec_validate_aligned (im->per_thread_data, vlib_num_workers (),
			CLIB_CACHE_LINE_BYTES);

  if ((error = vlib_call_init_function (vm, vnet_interface_cli_init)))
    return error;

  vnm->interface_tag_by_sw_if_index = hash_create (0, sizeof (uword));

#if VLIB_BUFFER_TRACE_TRAJECTORY > 0
  if ((error = vlib_call_init_function (vm, trajectory_trace_init)))
    return error;
#endif

  return 0;
}

VLIB_INIT_FUNCTION (vnet_interface_init);

/* Kludge to renumber interface names [only!] */
int
vnet_interface_name_renumber (u32 sw_if_index, u32 new_show_dev_instance)
{
  int rv;
  vnet_main_t *vnm = vnet_get_main ();
  vnet_interface_main_t *im = &vnm->interface_main;
  vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);

  vnet_device_class_t *dev_class = vnet_get_device_class
    (vnm, hi->dev_class_index);

  if (dev_class->name_renumber == 0 || dev_class->format_device_name == 0)
    return VNET_API_ERROR_UNIMPLEMENTED;

  rv = dev_class->name_renumber (hi, new_show_dev_instance);

  if (rv)
    return rv;

  hash_unset_mem (im->hw_interface_by_name, hi->name);
  vec_free (hi->name);
  /* Use the mapping we set up to call it Ishmael */
  hi->name = format (0, "%U", dev_class->format_device_name,
		     hi->dev_instance);

  hash_set_mem (im->hw_interface_by_name, hi->name, hi->hw_if_index);
  return rv;
}

clib_error_t *
vnet_rename_interface (vnet_main_t * vnm, u32 hw_if_index, char *new_name)
{
  vnet_interface_main_t *im = &vnm->interface_main;
  vlib_main_t *vm = vnm->vlib_main;
  vnet_hw_interface_t *hw;
  u8 *old_name;
  clib_error_t *error = 0;

  hw = vnet_get_hw_interface (vnm, hw_if_index);
  if (!hw)
    {
      return clib_error_return (0,
				"unable to find hw interface for index %u",
				hw_if_index);
    }

  old_name = hw->name;

  /* set new hw->name */
  hw->name = format (0, "%s", new_name);

  /* remove the old name to hw_if_index mapping and install the new one */
  hash_unset_mem (im->hw_interface_by_name, old_name);
  hash_set_mem (im->hw_interface_by_name, hw->name, hw_if_index);

  /* rename tx/output nodes */
  vlib_node_rename (vm, hw->tx_node_index, "%v-tx", hw->name);
  vlib_node_rename (vm, hw->output_node_index, "%v-output", hw->name);

  /* free the old name vector */
  vec_free (old_name);

  return error;
}

clib_error_t *
vnet_hw_interface_add_del_mac_address (vnet_main_t * vnm,
				       u32 hw_if_index,
				       const u8 * mac_address, u8 is_add)
{
  clib_error_t *error = 0;
  vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);

  vnet_device_class_t *dev_class =
    vnet_get_device_class (vnm, hi->dev_class_index);

  if (!hi->hw_address)
    {
      error =
	clib_error_return
	(0, "Secondary MAC Addresses not supported for interface index %u",
	 hw_if_index);
      goto done;
    }

  if (dev_class->mac_addr_add_del_function)
    error = dev_class->mac_addr_add_del_function (hi, mac_address, is_add);

  if (!error)
    {
      vnet_hw_interface_class_t *hw_class;

      hw_class = vnet_get_hw_interface_class (vnm, hi->hw_class_index);

      if (NULL != hw_class->mac_addr_add_del_function)
	error = hw_class->mac_addr_add_del_function (hi, mac_address, is_add);
    }

  /* If no errors, add to the list of secondary MACs on the ethernet intf */
  if (!error)
    ethernet_interface_add_del_address (&ethernet_main, hw_if_index,
					mac_address, is_add);

done:
  return error;
}

static clib_error_t *
vnet_hw_interface_change_mac_address_helper (vnet_main_t * vnm,
					     u32 hw_if_index,
					     const u8 * mac_address)
{
  clib_error_t *error = 0;
  vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);

  if (hi->hw_address)
    {
      u8 *old_address = vec_dup (hi->hw_address);
      vnet_device_class_t *dev_class =
	vnet_get_device_class (vnm, hi->dev_class_index);
      if (dev_class->mac_addr_change_function)
	{
	  error =
	    dev_class->mac_addr_change_function (hi, old_address,
						 mac_address);
	}
      if (!error)
	{
	  vnet_hw_interface_class_t *hw_class;

	  hw_class = vnet_get_hw_interface_class (vnm, hi->hw_class_index);

	  if (NULL != hw_class->mac_addr_change_function)
	    hw_class->mac_addr_change_function (hi, old_address, mac_address);
	}
      else
	{
	  error =
	    clib_error_return (0,
			       "MAC Address Change is not supported on this interface");
	}
      vec_free (old_address);
    }
  else
    {
      error =
	clib_error_return (0,
			   "mac address change is not supported for interface index %u",
			   hw_if_index);
    }
  return error;
}

clib_error_t *
vnet_hw_interface_change_mac_address (vnet_main_t * vnm, u32 hw_if_index,
				      const u8 * mac_address)
{
  return vnet_hw_interface_change_mac_address_helper
    (vnm, hw_if_index, mac_address);
}

/* update the unnumbered state of an interface*/
void
vnet_sw_interface_update_unnumbered (u32 unnumbered_sw_if_index,
				     u32 ip_sw_if_index, u8 enable)
{
  vnet_main_t *vnm = vnet_get_main ();
  vnet_sw_interface_t *si;
  u32 was_unnum;

  si = vnet_get_sw_interface (vnm, unnumbered_sw_if_index);
  was_unnum = (si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED);

  if (enable)
    {
      si->flags |= VNET_SW_INTERFACE_FLAG_UNNUMBERED;
      si->unnumbered_sw_if_index = ip_sw_if_index;

      ip4_main.lookup_main.if_address_pool_index_by_sw_if_index
	[unnumbered_sw_if_index] =
	ip4_main.
	lookup_main.if_address_pool_index_by_sw_if_index[ip_sw_if_index];
      ip6_main.
	lookup_main.if_address_pool_index_by_sw_if_index
	[unnumbered_sw_if_index] =
	ip6_main.
	lookup_main.if_address_pool_index_by_sw_if_index[ip_sw_if_index];
    }
  else
    {
      si->flags &= ~(VNET_SW_INTERFACE_FLAG_UNNUMBERED);
      si->unnumbered_sw_if_index = (u32) ~ 0;

      ip4_main.lookup_main.if_address_pool_index_by_sw_if_index
	[unnumbered_sw_if_index] = ~0;
      ip6_main.lookup_main.if_address_pool_index_by_sw_if_index
	[unnumbered_sw_if_index] = ~0;
    }

  if (was_unnum != (si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED))
    {
      ip4_sw_interface_enable_disable (unnumbered_sw_if_index, enable);
      ip6_sw_interface_enable_disable (unnumbered_sw_if_index, enable);
    }
}

vnet_l3_packet_type_t
vnet_link_to_l3_proto (vnet_link_t link)
{
  switch (link)
    {
    case VNET_LINK_IP4:
      return (VNET_L3_PACKET_TYPE_IP4);
    case VNET_LINK_IP6:
      return (VNET_L3_PACKET_TYPE_IP6);
    case VNET_LINK_MPLS:
      return (VNET_L3_PACKET_TYPE_MPLS);
    case VNET_LINK_ARP:
      return (VNET_L3_PACKET_TYPE_ARP);
    case VNET_LINK_ETHERNET:
    case VNET_LINK_NSH:
      ASSERT (0);
      break;
    }
  ASSERT (0);
  return (0);
}

vnet_mtu_t
vnet_link_to_mtu (vnet_link_t link)
{
  switch (link)
    {
    case VNET_LINK_IP4:
      return (VNET_MTU_IP4);
    case VNET_LINK_IP6:
      return (VNET_MTU_IP6);
    case VNET_LINK_MPLS:
      return (VNET_MTU_MPLS);
    default:
      return (VNET_MTU_L3);
    }
}

u8 *
default_build_rewrite (vnet_main_t * vnm,
		       u32 sw_if_index,
		       vnet_link_t link_type, const void *dst_address)
{
  return (NULL);
}

void
default_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
{
  ip_adjacency_t *adj;

  adj = adj_get (ai);

  switch (adj->lookup_next_index)
    {
    case IP_LOOKUP_NEXT_GLEAN:
      adj_glean_update_rewrite (ai);
      break;
    case IP_LOOKUP_NEXT_ARP:
    case IP_LOOKUP_NEXT_BCAST:
      /*
       * default rewrite in neighbour adj
       */
      adj_nbr_update_rewrite
	(ai,
	 ADJ_NBR_REWRITE_FLAG_COMPLETE,
	 vnet_build_rewrite_for_sw_interface (vnm,
					      sw_if_index,
					      adj_get_link_type (ai), NULL));
      break;
    case IP_LOOKUP_NEXT_MCAST:
      /*
       * mcast traffic also uses default rewrite string with no mcast
       * switch time updates.
       */
      adj_mcast_update_rewrite
	(ai,
	 vnet_build_rewrite_for_sw_interface (vnm,
					      sw_if_index,
					      adj_get_link_type (ai),
					      NULL), 0);
      break;
    case IP_LOOKUP_NEXT_DROP:
    case IP_LOOKUP_NEXT_PUNT:
    case IP_LOOKUP_NEXT_LOCAL:
    case IP_LOOKUP_NEXT_REWRITE:
    case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
    case IP_LOOKUP_NEXT_MIDCHAIN:
    case IP_LOOKUP_NEXT_ICMP_ERROR:
    case IP_LOOKUP_N_NEXT:
      ASSERT (0);
      break;
    }
}

int collect_detailed_interface_stats_flag = 0;

void
collect_detailed_interface_stats_flag_set (void)
{
  collect_detailed_interface_stats_flag = 1;
}

void
collect_detailed_interface_stats_flag_clear (void)
{
  collect_detailed_interface_stats_flag = 0;
}

static clib_error_t *
collect_detailed_interface_stats_cli (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 = NULL;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return clib_error_return (0, "expected enable | disable");

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "enable") || unformat (line_input, "on"))
	collect_detailed_interface_stats_flag_set ();
      else if (unformat (line_input, "disable")
	       || unformat (line_input, "off"))
	collect_detailed_interface_stats_flag_clear ();
      else
	{
	  error = clib_error_return (0, "unknown input `%U'",
				     format_unformat_error, line_input);
	  goto done;
	}
    }

done:
  unformat_free (line_input);
  return error;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (collect_detailed_interface_stats_command, static) = {
  .path = "interface collect detailed-stats",
  .short_help = "interface collect detailed-stats <enable|disable>",
  .function = collect_detailed_interface_stats_cli,
};
/* *INDENT-ON* */

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