import socket from scapy.layers.inet import IP, UDP from scapy.layers.inet6 import IPv6 from scapy.layers.l2 import Ether, GRE from scapy.packet import Raw from scapy.data import IP_PROTOS from framework import VppTestCase from util import ppp """ TestLB is a subclass of VPPTestCase classes. TestLB class defines Load Balancer test cases for: - IP4 to GRE4 encap on per-port vip case - IP4 to GRE6 encap on per-port vip case - IP6 to GRE4 encap on per-port vip case - IP6 to GRE6 encap on per-port vip case - IP4 to L3DSR encap on vip case - IP4 to L3DSR encap on per-port vip case - IP4 to NAT4 encap on per-port vip case - IP6 to NAT6 encap on per-port vip case As stated in comments below, GRE has issues with IPv6. All test cases involving IPv6 are executed, but received packets are not parsed and checked. """ class TestLB(VppTestCase): """ Load Balancer Test Case """ @classmethod def setUpClass(cls): super(TestLB, cls).setUpClass() cls.ass = range(5) cls.packets = range(1) try: cls.create_pg_interfaces(range(2)) cls.interfaces = list(cls.pg_interfaces) for i in cls.interfaces: i.admin_up() i.config_ip4() i.config_ip6() i.disable_ipv6_ra() i.resolve_arp() i.resolve_ndp() dst4 = socket.inet_pton(socket.AF_INET, "10.0.0.0") dst6 = socket.inet_pton(socket.AF_INET6, "2002::") cls.vapi.ip_add_del_route(dst4, 24, cls.pg1.remote_ip4n) cls.vapi.ip_add_del_route(dst6, 16, cls.pg1.remote_ip6n, is_ipv6=1) cls.vapi.cli("lb conf ip4-src-address 39.40.41.42") cls.vapi.cli("lb conf ip6-src-address 2004::1") except Exception: super(TestLB, cls).tearDownClass() raise def tearDown(self): super(TestLB, self).tearDown() if not self.vpp_dead: self.logger.info(self.vapi.cli("show lb vip verbose")) def getIPv4Flow(self, id): return (IP(dst="90.0.%u.%u" % (id / 255, id % 255), src="40.0.%u.%u" % (id / 255, id % 255)) / UDP(sport=10000 + id, dport=20000)) def getIPv6Flow(self, id): return (IPv6(dst="2001::%u" % (id), src="fd00:f00d:ffff::%u" % (id)) / UDP(sport=10000 + id, dport=20000)) def generatePackets(self, src_if, isv4): self.reset_packet_infos() pkts = [] for pktid in self.packets: info = self.create_packet_info(src_if, self.pg1) payload = self.info_to_payload(info) ip = self.getIPv4Flow(pktid) if isv4 else self.getIPv6Flow(pktid) packet = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) / ip / Raw(payload)) self.extend_packet(packet, 128) info.data = packet.copy() pkts.append(packet) return pkts def checkInner(self, gre, isv4): IPver = IP if isv4 else IPv6 self.assertEqual(gre.proto, 0x0800 if isv4 else 0x86DD) self.assertEqual(gre.flags, 0) self.assertEqual(gre.version, 0) inner = IPver(str(gre.payload)) payload_info = self.payload_to_info(inner[Raw]) self.info = self.packet_infos[payload_info.index] self.assertEqual(payload_info.src, self.pg0.sw_if_index) self.assertEqual(str(inner), str(self.info.data[IPver])) def checkCapture(self, encap, isv4): self.pg0.assert_nothing_captured() out = self.pg1.get_capture(len(self.packets)) load = [0] * len(self.ass) self.info = None for p in out: try: asid = 0 gre = None if (encap == 'gre4'): ip = p[IP] asid = int(ip.dst.split(".")[3]) self.assertEqual(ip.version, 4) self.assertEqual(ip.flags, 0) self.assertEqual(ip.src, "39.40.41.42") self.assertEqual(ip.dst, "10.0.0.%u" % asid) self.assertEqual(ip.proto, 47) self.assertEqual(len(ip.options), 0) gre = p[GRE] self.checkInner(gre, isv4) elif (encap == 'gre6'): ip = p[IPv6] asid = ip.dst.split(":") asid = asid[len(asid) - 1] asid = 0 if asid == "" else int(asid) self.assertEqual(ip.version, 6) self.assertEqual(ip.tc, 0) self.assertEqual(ip.fl, 0) self.assertEqual(ip.src, "2004::1") self.assertEqual( socket.inet_pton(socket.AF_INET6, ip.dst), socket.inet_pton(socket.AF_INET6, "2002::%u" % asid) ) self.assertEqual(ip.nh, 47) # self.assertEqual(len(ip.options), 0) gre = GRE(str(p[IPv6].payload)) self.checkInner(gre, isv4) elif (encap == 'l3dsr'): ip = p[IP] asid = int(ip.dst.split(".")[3]) self.assertEqual(ip.version, 4) self.assertEqual(ip.flags, 0) self.assertEqual(ip.dst, "10.0.0.%u" % asid) self.assertEqual(ip.tos, 0x1c) self.assertEqual(len(ip.options), 0) self.assert_ip_checksum_valid(p) if ip.proto == IP_PROTOS.tcp: self.assert_tcp_checksum_valid(p) elif ip.proto == IP_PROTOS.udp: self.assert_udp_checksum_valid(p) elif (encap == 'nat4'): ip = p[IP] asid = int(ip.dst.split(".")[3]) self.assertEqual(ip.version, 4) self.assertEqual(ip.flags, 0) self.assertEqual(ip.dst, "10.0.0.%u" % asid) self.assertEqual(ip.proto, 17) self.assertEqual(len(ip.options), 0) udp = p[UDP] self.assertEqual(udp.dport, 3307) elif (encap == 'nat6'): ip = p[IPv6] asid = ip.dst.split(":") asid = asid[len(asid) - 1] asid = 0 if asid == "" else int(asid) self.assertEqual(ip.version, 6) self.assertEqual(ip.tc, 0) self.assertEqual(ip.fl, 0) self.assertEqual( socket.inet_pton(socket.AF_INET6, ip.dst), socket.inet_pton(socket.AF_INET6, "2002::%u" % asid) ) self.assertEqual(ip.nh, 17) self.assertGreaterEqual(ip.hlim, 63) udp = UDP(str(p[IPv6].payload)) self.assertEqual(udp.dport, 3307) load[asid] += 1 except: self.logger.error(ppp("Unexpected or invalid packet:", p)) raise # This is just to 1roughly check that the balancing algorithm # is not completly biased. for asid in self.ass: if load[asid] < len(self.packets) / (len(self.ass) * 2): self.logger.error( "ASS is not balanced: load[%d] = %d" % (asid, load[asid])) raise Exception("Load Balancer algorithm is biased") def test_lb_ip4_gre4(self): """ Load Balancer IP4 GRE4 on vip case """ try: self.vapi.cli( "lb vip 90.0.0.0/8 encap gre4") for asid in self.ass: self.vapi.cli( "lb as 90.0.0.0/8 10.0.0.%u" % (asid)) self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True)) self.pg_enable_capture(self.pg_interfaces) self.pg_start() self.checkCapture(encap='gre4', isv4=True) finally: for asid in self.ass: self.vapi.cli( "lb as 90.0.0.0/8 10.0.0.%u del" % (asid)) self.vapi.cli( "lb vip 90.0.0.0/8 encap gre4 del") 
/*
 * 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.
 */
/*
 * physmem.h: virtual <-> physical memory mapping for VLIB buffers
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a c