| #!/usr/bin/python |
| # |
| # Copyright 2014 The Android Open Source Project |
| # |
| # 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. |
| |
| import errno |
| import os |
| import random |
| from socket import * # pylint: disable=wildcard-import |
| import struct |
| import time # pylint: disable=unused-import |
| import unittest |
| |
| from scapy import all as scapy |
| |
| import iproute |
| import multinetwork_base |
| import net_test |
| import packets |
| |
| # For brevity. |
| UDP_PAYLOAD = net_test.UDP_PAYLOAD |
| |
| IPV6_FLOWINFO = 11 |
| |
| IPV4_MARK_REFLECT_SYSCTL = "/proc/sys/net/ipv4/fwmark_reflect" |
| IPV6_MARK_REFLECT_SYSCTL = "/proc/sys/net/ipv6/fwmark_reflect" |
| SYNCOOKIES_SYSCTL = "/proc/sys/net/ipv4/tcp_syncookies" |
| TCP_MARK_ACCEPT_SYSCTL = "/proc/sys/net/ipv4/tcp_fwmark_accept" |
| |
| # The IP[V6]UNICAST_IF socket option was added between 3.1 and 3.4. |
| HAVE_UNICAST_IF = net_test.LINUX_VERSION >= (3, 4, 0) |
| |
| |
| class ConfigurationError(AssertionError): |
| pass |
| |
| |
| class InboundMarkingTest(multinetwork_base.MultiNetworkBaseTest): |
| |
| @classmethod |
| def _SetInboundMarking(cls, netid, is_add): |
| for version in [4, 6]: |
| # Run iptables to set up incoming packet marking. |
| iface = cls.GetInterfaceName(netid) |
| add_del = "-A" if is_add else "-D" |
| iptables = {4: "iptables", 6: "ip6tables"}[version] |
| args = "%s %s INPUT -t mangle -i %s -j MARK --set-mark %d" % ( |
| iptables, add_del, iface, netid) |
| iptables = "/sbin/" + iptables |
| ret = os.spawnvp(os.P_WAIT, iptables, args.split(" ")) |
| if ret: |
| raise ConfigurationError("Setup command failed: %s" % args) |
| |
| @classmethod |
| def setUpClass(cls): |
| super(InboundMarkingTest, cls).setUpClass() |
| for netid in cls.tuns: |
| cls._SetInboundMarking(netid, True) |
| |
| @classmethod |
| def tearDownClass(cls): |
| for netid in cls.tuns: |
| cls._SetInboundMarking(netid, False) |
| super(InboundMarkingTest, cls).tearDownClass() |
| |
| @classmethod |
| def SetMarkReflectSysctls(cls, value): |
| cls.SetSysctl(IPV4_MARK_REFLECT_SYSCTL, value) |
| try: |
| cls.SetSysctl(IPV6_MARK_REFLECT_SYSCTL, value) |
| except IOError: |
| # This does not exist if we use the version of the patch that uses a |
| # common sysctl for IPv4 and IPv6. |
| pass |
| |
| |
| class OutgoingTest(multinetwork_base.MultiNetworkBaseTest): |
| |
| # How many times to run outgoing packet tests. |
| ITERATIONS = 5 |
| |
| def CheckPingPacket(self, version, netid, routing_mode, dstaddr, packet): |
| s = self.BuildSocket(version, net_test.PingSocket, netid, routing_mode) |
| |
| myaddr = self.MyAddress(version, netid) |
| s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1) |
| s.bind((myaddr, packets.PING_IDENT)) |
| net_test.SetSocketTos(s, packets.PING_TOS) |
| |
| desc, expected = packets.ICMPEcho(version, myaddr, dstaddr) |
| msg = "IPv%d ping: expected %s on %s" % ( |
| version, desc, self.GetInterfaceName(netid)) |
| |
| s.sendto(packet + packets.PING_PAYLOAD, (dstaddr, 19321)) |
| |
| self.ExpectPacketOn(netid, msg, expected) |
| |
| def CheckTCPSYNPacket(self, version, netid, routing_mode, dstaddr): |
| s = self.BuildSocket(version, net_test.TCPSocket, netid, routing_mode) |
| |
| if version == 6 and dstaddr.startswith("::ffff"): |
| version = 4 |
| myaddr = self.MyAddress(version, netid) |
| desc, expected = packets.SYN(53, version, myaddr, dstaddr, |
| sport=None, seq=None) |
| |
| # Non-blocking TCP connects always return EINPROGRESS. |
| self.assertRaisesErrno(errno.EINPROGRESS, s.connect, (dstaddr, 53)) |
| msg = "IPv%s TCP connect: expected %s on %s" % ( |
| version, desc, self.GetInterfaceName(netid)) |
| self.ExpectPacketOn(netid, msg, expected) |
| s.close() |
| |
| def CheckUDPPacket(self, version, netid, routing_mode, dstaddr): |
| s = self.BuildSocket(version, net_test.UDPSocket, netid, routing_mode) |
| |
| if version == 6 and dstaddr.startswith("::ffff"): |
| version = 4 |
| myaddr = self.MyAddress(version, netid) |
| desc, expected = packets.UDP(version, myaddr, dstaddr, sport=None) |
| msg = "IPv%s UDP %%s: expected %s on %s" % ( |
| version, desc, self.GetInterfaceName(netid)) |
| |
| s.sendto(UDP_PAYLOAD, (dstaddr, 53)) |
| self.ExpectPacketOn(netid, msg % "sendto", expected) |
| |
| # IP_UNICAST_IF doesn't seem to work on connected sockets, so no TCP. |
| if routing_mode != "ucast_oif": |
| s.connect((dstaddr, 53)) |
| s.send(UDP_PAYLOAD) |
| self.ExpectPacketOn(netid, msg % "connect/send", expected) |
| s.close() |
| |
| def CheckRawGrePacket(self, version, netid, routing_mode, dstaddr): |
| s = self.BuildSocket(version, net_test.RawGRESocket, netid, routing_mode) |
| |
| inner_version = {4: 6, 6: 4}[version] |
| inner_src = self.MyAddress(inner_version, netid) |
| inner_dst = self.GetRemoteAddress(inner_version) |
| inner = str(packets.UDP(inner_version, inner_src, inner_dst, sport=None)[1]) |
| |
| ethertype = {4: net_test.ETH_P_IP, 6: net_test.ETH_P_IPV6}[inner_version] |
| # A GRE header can be as simple as two zero bytes and the ethertype. |
| packet = struct.pack("!i", ethertype) + inner |
| myaddr = self.MyAddress(version, netid) |
| |
| s.sendto(packet, (dstaddr, IPPROTO_GRE)) |
| desc, expected = packets.GRE(version, myaddr, dstaddr, ethertype, inner) |
| msg = "Raw IPv%d GRE with inner IPv%d UDP: expected %s on %s" % ( |
| version, inner_version, desc, self.GetInterfaceName(netid)) |
| self.ExpectPacketOn(netid, msg, expected) |
| |
| def CheckOutgoingPackets(self, routing_mode): |
| v4addr = self.IPV4_ADDR |
| v6addr = self.IPV6_ADDR |
| v4mapped = "::ffff:" + v4addr |
| |
| for _ in xrange(self.ITERATIONS): |
| for netid in self.tuns: |
| |
| self.CheckPingPacket(4, netid, routing_mode, v4addr, self.IPV4_PING) |
| # Kernel bug. |
| if routing_mode != "oif": |
| self.CheckPingPacket(6, netid, routing_mode, v6addr, self.IPV6_PING) |
| |
| # IP_UNICAST_IF doesn't seem to work on connected sockets, so no TCP. |
| if routing_mode != "ucast_oif": |
| self.CheckTCPSYNPacket(4, netid, routing_mode, v4addr) |
| self.CheckTCPSYNPacket(6, netid, routing_mode, v6addr) |
| self.CheckTCPSYNPacket(6, netid, routing_mode, v4mapped) |
| |
| self.CheckUDPPacket(4, netid, routing_mode, v4addr) |
| self.CheckUDPPacket(6, netid, routing_mode, v6addr) |
| self.CheckUDPPacket(6, netid, routing_mode, v4mapped) |
| |
| # Creating raw sockets on non-root UIDs requires properly setting |
| # capabilities, which is hard to do from Python. |
| # IP_UNICAST_IF is not supported on raw sockets. |
| if routing_mode not in ["uid", "ucast_oif"]: |
| self.CheckRawGrePacket(4, netid, routing_mode, v4addr) |
| self.CheckRawGrePacket(6, netid, routing_mode, v6addr) |
| |
| def testMarkRouting(self): |
| """Checks that socket marking selects the right outgoing interface.""" |
| self.CheckOutgoingPackets("mark") |
| |
| @unittest.skipUnless(multinetwork_base.HAVE_UID_ROUTING, "no UID routes") |
| def testUidRouting(self): |
| """Checks that UID routing selects the right outgoing interface.""" |
| self.CheckOutgoingPackets("uid") |
| |
| def testOifRouting(self): |
| """Checks that oif routing selects the right outgoing interface.""" |
| self.CheckOutgoingPackets("oif") |
| |
| @unittest.skipUnless(HAVE_UNICAST_IF, "no support for UNICAST_IF") |
| def testUcastOifRouting(self): |
| """Checks that ucast oif routing selects the right outgoing interface.""" |
| self.CheckOutgoingPackets("ucast_oif") |
| |
| def CheckRemarking(self, version, use_connect): |
| # Remarking or resetting UNICAST_IF on connected sockets does not work. |
| if use_connect: |
| modes = ["oif"] |
| else: |
| modes = ["mark", "oif"] |
| if HAVE_UNICAST_IF: |
| modes += ["ucast_oif"] |
| |
| for mode in modes: |
| s = net_test.UDPSocket(self.GetProtocolFamily(version)) |
| |
| # Figure out what packets to expect. |
| sport = net_test.BindRandomPort(version, s) |
| dstaddr = {4: self.IPV4_ADDR, 6: self.IPV6_ADDR}[version] |
| unspec = {4: "0.0.0.0", 6: "::"}[version] # Placeholder. |
| desc, expected = packets.UDP(version, unspec, dstaddr, sport) |
| |
| # If we're testing connected sockets, connect the socket on the first |
| # netid now. |
| if use_connect: |
| netid = self.tuns.keys()[0] |
| self.SelectInterface(s, netid, mode) |
| s.connect((dstaddr, 53)) |
| expected.src = self.MyAddress(version, netid) |
| |
| # For each netid, select that network without closing the socket, and |
| # check that the packets sent on that socket go out on the right network. |
| for netid in self.tuns: |
| self.SelectInterface(s, netid, mode) |
| if not use_connect: |
| expected.src = self.MyAddress(version, netid) |
| s.sendto(UDP_PAYLOAD, (dstaddr, 53)) |
| connected_str = "Connected" if use_connect else "Unconnected" |
| msg = "%s UDPv%d socket remarked using %s: expecting %s on %s" % ( |
| connected_str, version, mode, desc, self.GetInterfaceName(netid)) |
| self.ExpectPacketOn(netid, msg, expected) |
| self.SelectInterface(s, None, mode) |
| |
| def testIPv4Remarking(self): |
| """Checks that updating the mark on an IPv4 socket changes routing.""" |
| self.CheckRemarking(4, False) |
| self.CheckRemarking(4, True) |
| |
| def testIPv6Remarking(self): |
| """Checks that updating the mark on an IPv6 socket changes routing.""" |
| self.CheckRemarking(6, False) |
| self.CheckRemarking(6, True) |
| |
| def testIPv6StickyPktinfo(self): |
| for _ in xrange(self.ITERATIONS): |
| for netid in self.tuns: |
| s = net_test.UDPSocket(AF_INET6) |
| |
| # Set a flowlabel. |
| net_test.SetFlowLabel(s, net_test.IPV6_ADDR, 0xdead) |
| s.setsockopt(net_test.SOL_IPV6, net_test.IPV6_FLOWINFO_SEND, 1) |
| |
| # Set some destination options. |
| nonce = "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c" |
| dstopts = "".join([ |
| "\x11\x02", # Next header=UDP, 24 bytes of options. |
| "\x01\x06", "\x00" * 6, # PadN, 6 bytes of padding. |
| "\x8b\x0c", # ILNP nonce, 12 bytes. |
| nonce |
| ]) |
| s.setsockopt(net_test.SOL_IPV6, IPV6_DSTOPTS, dstopts) |
| s.setsockopt(net_test.SOL_IPV6, IPV6_UNICAST_HOPS, 255) |
| |
| pktinfo = multinetwork_base.MakePktInfo(6, None, self.ifindices[netid]) |
| |
| # Set the sticky pktinfo option. |
| s.setsockopt(net_test.SOL_IPV6, IPV6_PKTINFO, pktinfo) |
| |
| # Specify the flowlabel in the destination address. |
| s.sendto(UDP_PAYLOAD, (net_test.IPV6_ADDR, 53, 0xdead, 0)) |
| |
| sport = s.getsockname()[1] |
| srcaddr = self.MyAddress(6, netid) |
| expected = (scapy.IPv6(src=srcaddr, dst=net_test.IPV6_ADDR, |
| fl=0xdead, hlim=255) / |
| scapy.IPv6ExtHdrDestOpt( |
| options=[scapy.PadN(optdata="\x00\x00\x00\x00\x00\x00"), |
| scapy.HBHOptUnknown(otype=0x8b, |
| optdata=nonce)]) / |
| scapy.UDP(sport=sport, dport=53) / |
| UDP_PAYLOAD) |
| msg = "IPv6 UDP using sticky pktinfo: expected UDP packet on %s" % ( |
| self.GetInterfaceName(netid)) |
| self.ExpectPacketOn(netid, msg, expected) |
| |
| def CheckPktinfoRouting(self, version): |
| for _ in xrange(self.ITERATIONS): |
| for netid in self.tuns: |
| family = self.GetProtocolFamily(version) |
| s = net_test.UDPSocket(family) |
| |
| if version == 6: |
| # Create a flowlabel so we can use it. |
| net_test.SetFlowLabel(s, net_test.IPV6_ADDR, 0xbeef) |
| |
| # Specify some arbitrary options. |
| cmsgs = [ |
| (net_test.SOL_IPV6, IPV6_HOPLIMIT, 39), |
| (net_test.SOL_IPV6, IPV6_TCLASS, 0x83), |
| (net_test.SOL_IPV6, IPV6_FLOWINFO, int(htonl(0xbeef))), |
| ] |
| else: |
| # Support for setting IPv4 TOS and TTL via cmsg only appeared in 3.13. |
| cmsgs = [] |
| s.setsockopt(net_test.SOL_IP, IP_TTL, 39) |
| s.setsockopt(net_test.SOL_IP, IP_TOS, 0x83) |
| |
| dstaddr = self.GetRemoteAddress(version) |
| self.SendOnNetid(version, s, dstaddr, 53, netid, UDP_PAYLOAD, cmsgs) |
| |
| sport = s.getsockname()[1] |
| srcaddr = self.MyAddress(version, netid) |
| |
| desc, expected = packets.UDPWithOptions(version, srcaddr, dstaddr, |
| sport=sport) |
| |
| msg = "IPv%d UDP using pktinfo routing: expected %s on %s" % ( |
| version, desc, self.GetInterfaceName(netid)) |
| self.ExpectPacketOn(netid, msg, expected) |
| |
| def testIPv4PktinfoRouting(self): |
| self.CheckPktinfoRouting(4) |
| |
| def testIPv6PktinfoRouting(self): |
| self.CheckPktinfoRouting(6) |
| |
| |
| class MarkTest(InboundMarkingTest): |
| |
| def CheckReflection(self, version, gen_packet, gen_reply): |
| """Checks that replies go out on the same interface as the original. |
| |
| For each combination: |
| - Calls gen_packet to generate a packet to that IP address. |
| - Writes the packet generated by gen_packet on the given tun |
| interface, causing the kernel to receive it. |
| - Checks that the kernel's reply matches the packet generated by |
| gen_reply. |
| |
| Args: |
| version: An integer, 4 or 6. |
| gen_packet: A function taking an IP version (an integer), a source |
| address and a destination address (strings), and returning a scapy |
| packet. |
| gen_reply: A function taking the same arguments as gen_packet, |
| plus a scapy packet, and returning a scapy packet. |
| """ |
| for netid, iif, ip_if, myaddr, remoteaddr in self.Combinations(version): |
| # Generate a test packet. |
| desc, packet = gen_packet(version, remoteaddr, myaddr) |
| |
| # Test with mark reflection enabled and disabled. |
| for reflect in [0, 1]: |
| self.SetMarkReflectSysctls(reflect) |
| # HACK: IPv6 ping replies always do a routing lookup with the |
| # interface the ping came in on. So even if mark reflection is not |
| # working, IPv6 ping replies will be properly reflected. Don't |
| # fail when that happens. |
| if reflect or desc == "ICMPv6 echo": |
| reply_desc, reply = gen_reply(version, myaddr, remoteaddr, packet) |
| else: |
| reply_desc, reply = None, None |
| |
| msg = self._FormatMessage(iif, ip_if, "reflect=%d" % reflect, |
| desc, reply_desc) |
| self._ReceiveAndExpectResponse(netid, packet, reply, msg) |
| |
| def SYNToClosedPort(self, *args): |
| return packets.SYN(999, *args) |
| |
| def testIPv4ICMPErrorsReflectMark(self): |
| self.CheckReflection(4, packets.UDP, packets.ICMPPortUnreachable) |
| |
| def testIPv6ICMPErrorsReflectMark(self): |
| self.CheckReflection(6, packets.UDP, packets.ICMPPortUnreachable) |
| |
| def testIPv4PingRepliesReflectMarkAndTos(self): |
| self.CheckReflection(4, packets.ICMPEcho, packets.ICMPReply) |
| |
| def testIPv6PingRepliesReflectMarkAndTos(self): |
| self.CheckReflection(6, packets.ICMPEcho, packets.ICMPReply) |
| |
| def testIPv4RSTsReflectMark(self): |
| self.CheckReflection(4, self.SYNToClosedPort, packets.RST) |
| |
| def testIPv6RSTsReflectMark(self): |
| self.CheckReflection(6, self.SYNToClosedPort, packets.RST) |
| |
| |
| class TCPAcceptTest(InboundMarkingTest): |
| |
| MODE_BINDTODEVICE = "SO_BINDTODEVICE" |
| MODE_INCOMING_MARK = "incoming mark" |
| MODE_EXPLICIT_MARK = "explicit mark" |
| MODE_UID = "uid" |
| |
| @classmethod |
| def setUpClass(cls): |
| super(TCPAcceptTest, cls).setUpClass() |
| |
| # Open a port so we can observe SYN+ACKs. Since it's a dual-stack socket it |
| # will accept both IPv4 and IPv6 connections. We do this here instead of in |
| # each test so we can use the same socket every time. That way, if a kernel |
| # bug causes incoming packets to mark the listening socket instead of the |
| # accepted socket, the test will fail as soon as the next address/interface |
| # combination is tried. |
| cls.listensocket = net_test.IPv6TCPSocket() |
| cls.listenport = net_test.BindRandomPort(6, cls.listensocket) |
| |
| def BounceSocket(self, s): |
| """Attempts to invalidate a socket's destination cache entry.""" |
| if s.family == AF_INET: |
| tos = s.getsockopt(SOL_IP, IP_TOS) |
| s.setsockopt(net_test.SOL_IP, IP_TOS, 53) |
| s.setsockopt(net_test.SOL_IP, IP_TOS, tos) |
| else: |
| # UDP, 8 bytes dstopts; PAD1, 4 bytes padding; 4 bytes zeros. |
| pad8 = "".join(["\x11\x00", "\x01\x04", "\x00" * 4]) |
| s.setsockopt(net_test.SOL_IPV6, IPV6_DSTOPTS, pad8) |
| s.setsockopt(net_test.SOL_IPV6, IPV6_DSTOPTS, "") |
| |
| def _SetTCPMarkAcceptSysctl(self, value): |
| self.SetSysctl(TCP_MARK_ACCEPT_SYSCTL, value) |
| |
| def CheckTCPConnection(self, mode, listensocket, netid, version, |
| myaddr, remoteaddr, packet, reply, msg): |
| establishing_ack = packets.ACK(version, remoteaddr, myaddr, reply)[1] |
| |
| # Attempt to confuse the kernel. |
| self.BounceSocket(listensocket) |
| |
| self.ReceivePacketOn(netid, establishing_ack) |
| |
| # If we're using UID routing, the accept() call has to be run as a UID that |
| # is routed to the specified netid, because the UID of the socket returned |
| # by accept() is the effective UID of the process that calls it. It doesn't |
| # need to be the same UID; any UID that selects the same interface will do. |
| with net_test.RunAsUid(self.UidForNetid(netid)): |
| s, _ = listensocket.accept() |
| |
| try: |
| # Check that data sent on the connection goes out on the right interface. |
| desc, data = packets.ACK(version, myaddr, remoteaddr, establishing_ack, |
| payload=UDP_PAYLOAD) |
| s.send(UDP_PAYLOAD) |
| self.ExpectPacketOn(netid, msg + ": expecting %s" % desc, data) |
| self.BounceSocket(s) |
| |
| # Keep up our end of the conversation. |
| ack = packets.ACK(version, remoteaddr, myaddr, data)[1] |
| self.BounceSocket(listensocket) |
| self.ReceivePacketOn(netid, ack) |
| |
| mark = self.GetSocketMark(s) |
| finally: |
| self.BounceSocket(s) |
| s.close() |
| |
| if mode == self.MODE_INCOMING_MARK: |
| self.assertEquals(netid, mark, |
| msg + ": Accepted socket: Expected mark %d, got %d" % ( |
| netid, mark)) |
| elif mode != self.MODE_EXPLICIT_MARK: |
| self.assertEquals(0, self.GetSocketMark(listensocket)) |
| |
| # Check the FIN was sent on the right interface, and ack it. We don't expect |
| # this to fail because by the time the connection is established things are |
| # likely working, but a) extra tests are always good and b) extra packets |
| # like the FIN (and retransmitted FINs) could cause later tests that expect |
| # no packets to fail. |
| desc, fin = packets.FIN(version, myaddr, remoteaddr, ack) |
| self.ExpectPacketOn(netid, msg + ": expecting %s after close" % desc, fin) |
| |
| desc, finack = packets.FIN(version, remoteaddr, myaddr, fin) |
| self.ReceivePacketOn(netid, finack) |
| |
| # Since we called close() earlier, the userspace socket object is gone, so |
| # the socket has no UID. If we're doing UID routing, the ack might be routed |
| # incorrectly. Not much we can do here. |
| desc, finackack = packets.ACK(version, myaddr, remoteaddr, finack) |
| if mode != self.MODE_UID: |
| self.ExpectPacketOn(netid, msg + ": expecting final ack", finackack) |
| else: |
| self.ClearTunQueues() |
| |
| def CheckTCP(self, version, modes): |
| """Checks that incoming TCP connections work. |
| |
| Args: |
| version: An integer, 4 or 6. |
| modes: A list of modes to excercise. |
| """ |
| for syncookies in [0, 2]: |
| for mode in modes: |
| for netid, iif, ip_if, myaddr, remoteaddr in self.Combinations(version): |
| if mode == self.MODE_UID: |
| listensocket = self.BuildSocket(6, net_test.TCPSocket, netid, mode) |
| listensocket.listen(100) |
| else: |
| listensocket = self.listensocket |
| |
| listenport = listensocket.getsockname()[1] |
| |
| accept_sysctl = 1 if mode == self.MODE_INCOMING_MARK else 0 |
| self._SetTCPMarkAcceptSysctl(accept_sysctl) |
| |
| bound_dev = iif if mode == self.MODE_BINDTODEVICE else None |
| self.BindToDevice(listensocket, bound_dev) |
| |
| mark = netid if mode == self.MODE_EXPLICIT_MARK else 0 |
| self.SetSocketMark(listensocket, mark) |
| |
| # Generate the packet here instead of in the outer loop, so |
| # subsequent TCP connections use different source ports and |
| # retransmissions from old connections don't confuse subsequent |
| # tests. |
| desc, packet = packets.SYN(listenport, version, remoteaddr, myaddr) |
| |
| if mode: |
| reply_desc, reply = packets.SYNACK(version, myaddr, remoteaddr, |
| packet) |
| else: |
| reply_desc, reply = None, None |
| |
| extra = "mode=%s, syncookies=%d" % (mode, syncookies) |
| msg = self._FormatMessage(iif, ip_if, extra, desc, reply_desc) |
| reply = self._ReceiveAndExpectResponse(netid, packet, reply, msg) |
| if reply: |
| self.CheckTCPConnection(mode, listensocket, netid, version, myaddr, |
| remoteaddr, packet, reply, msg) |
| |
| def testBasicTCP(self): |
| self.CheckTCP(4, [None, self.MODE_BINDTODEVICE, self.MODE_EXPLICIT_MARK]) |
| self.CheckTCP(6, [None, self.MODE_BINDTODEVICE, self.MODE_EXPLICIT_MARK]) |
| |
| def testIPv4MarkAccept(self): |
| self.CheckTCP(4, [self.MODE_INCOMING_MARK]) |
| |
| def testIPv6MarkAccept(self): |
| self.CheckTCP(6, [self.MODE_INCOMING_MARK]) |
| |
| @unittest.skipUnless(multinetwork_base.HAVE_UID_ROUTING, "no UID routes") |
| def testIPv4UidAccept(self): |
| self.CheckTCP(4, [self.MODE_UID]) |
| |
| @unittest.skipUnless(multinetwork_base.HAVE_UID_ROUTING, "no UID routes") |
| def testIPv6UidAccept(self): |
| self.CheckTCP(6, [self.MODE_UID]) |
| |
| def testIPv6ExplicitMark(self): |
| self.CheckTCP(6, [self.MODE_EXPLICIT_MARK]) |
| |
| |
| class RATest(multinetwork_base.MultiNetworkBaseTest): |
| |
| def testDoesNotHaveObsoleteSysctl(self): |
| self.assertFalse(os.path.isfile( |
| "/proc/sys/net/ipv6/route/autoconf_table_offset")) |
| |
| @unittest.skipUnless(multinetwork_base.HAVE_AUTOCONF_TABLE, |
| "no support for per-table autoconf") |
| def testPurgeDefaultRouters(self): |
| |
| def CheckIPv6Connectivity(expect_connectivity): |
| for netid in self.NETIDS: |
| s = net_test.UDPSocket(AF_INET6) |
| self.SetSocketMark(s, netid) |
| if expect_connectivity: |
| self.assertTrue(s.sendto(UDP_PAYLOAD, (net_test.IPV6_ADDR, 1234))) |
| else: |
| self.assertRaisesErrno(errno.ENETUNREACH, s.sendto, UDP_PAYLOAD, |
| (net_test.IPV6_ADDR, 1234)) |
| |
| try: |
| CheckIPv6Connectivity(True) |
| self.SetIPv6SysctlOnAllIfaces("accept_ra", 1) |
| self.SetSysctl("/proc/sys/net/ipv6/conf/all/forwarding", 1) |
| CheckIPv6Connectivity(False) |
| finally: |
| self.SetSysctl("/proc/sys/net/ipv6/conf/all/forwarding", 0) |
| for netid in self.NETIDS: |
| self.SendRA(netid) |
| CheckIPv6Connectivity(True) |
| |
| def testOnlinkCommunication(self): |
| """Checks that on-link communication goes direct and not through routers.""" |
| for netid in self.tuns: |
| # Send a UDP packet to a random on-link destination. |
| s = net_test.UDPSocket(AF_INET6) |
| iface = self.GetInterfaceName(netid) |
| self.BindToDevice(s, iface) |
| # dstaddr can never be our address because GetRandomDestination only fills |
| # in the lower 32 bits, but our address has 0xff in the byte before that |
| # (since it's constructed from the EUI-64 and so has ff:fe in the middle). |
| dstaddr = self.GetRandomDestination(self.IPv6Prefix(netid)) |
| s.sendto(UDP_PAYLOAD, (dstaddr, 53)) |
| |
| # Expect an NS for that destination on the interface. |
| myaddr = self.MyAddress(6, netid) |
| mymac = self.MyMacAddress(netid) |
| desc, expected = packets.NS(myaddr, dstaddr, mymac) |
| msg = "Sending UDP packet to on-link destination: expecting %s" % desc |
| time.sleep(0.0001) # Required to make the test work on kernel 3.1(!) |
| self.ExpectPacketOn(netid, msg, expected) |
| |
| # Send an NA. |
| tgtmac = "02:00:00:00:%02x:99" % netid |
| _, reply = packets.NA(dstaddr, myaddr, tgtmac) |
| # Don't use ReceivePacketOn, since that uses the router's MAC address as |
| # the source. Instead, construct our own Ethernet header with source |
| # MAC of tgtmac. |
| reply = scapy.Ether(src=tgtmac, dst=mymac) / reply |
| self.ReceiveEtherPacketOn(netid, reply) |
| |
| # Expect the kernel to send the original UDP packet now that the ND cache |
| # entry has been populated. |
| sport = s.getsockname()[1] |
| desc, expected = packets.UDP(6, myaddr, dstaddr, sport=sport) |
| msg = "After NA response, expecting %s" % desc |
| self.ExpectPacketOn(netid, msg, expected) |
| |
| # This test documents a known issue: routing tables are never deleted. |
| @unittest.skipUnless(multinetwork_base.HAVE_AUTOCONF_TABLE, |
| "no support for per-table autoconf") |
| def testLeftoverRoutes(self): |
| def GetNumRoutes(): |
| return len(open("/proc/net/ipv6_route").readlines()) |
| |
| num_routes = GetNumRoutes() |
| for i in xrange(10, 20): |
| try: |
| self.tuns[i] = self.CreateTunInterface(i) |
| self.SendRA(i) |
| self.tuns[i].close() |
| finally: |
| del self.tuns[i] |
| self.assertLess(num_routes, GetNumRoutes()) |
| |
| |
| class PMTUTest(InboundMarkingTest): |
| |
| PAYLOAD_SIZE = 1400 |
| |
| # Socket options to change PMTU behaviour. |
| IP_MTU_DISCOVER = 10 |
| IP_PMTUDISC_DO = 1 |
| IPV6_DONTFRAG = 62 |
| |
| # Socket options to get the MTU. |
| IP_MTU = 14 |
| IPV6_PATHMTU = 61 |
| |
| def GetSocketMTU(self, version, s): |
| if version == 6: |
| ip6_mtuinfo = s.getsockopt(net_test.SOL_IPV6, self.IPV6_PATHMTU, 32) |
| unused_sockaddr, mtu = struct.unpack("=28sI", ip6_mtuinfo) |
| return mtu |
| else: |
| return s.getsockopt(net_test.SOL_IP, self.IP_MTU) |
| |
| def DisableFragmentationAndReportErrors(self, version, s): |
| if version == 4: |
| s.setsockopt(net_test.SOL_IP, self.IP_MTU_DISCOVER, self.IP_PMTUDISC_DO) |
| s.setsockopt(net_test.SOL_IP, net_test.IP_RECVERR, 1) |
| else: |
| s.setsockopt(net_test.SOL_IPV6, self.IPV6_DONTFRAG, 1) |
| s.setsockopt(net_test.SOL_IPV6, net_test.IPV6_RECVERR, 1) |
| |
| def CheckPMTU(self, version, use_connect, modes): |
| |
| def SendBigPacket(version, s, dstaddr, netid, payload): |
| if use_connect: |
| s.send(payload) |
| else: |
| self.SendOnNetid(version, s, dstaddr, 1234, netid, payload, []) |
| |
| for netid in self.tuns: |
| for mode in modes: |
| s = self.BuildSocket(version, net_test.UDPSocket, netid, mode) |
| self.DisableFragmentationAndReportErrors(version, s) |
| |
| srcaddr = self.MyAddress(version, netid) |
| dst_prefix, intermediate = { |
| 4: ("172.19.", "172.16.9.12"), |
| 6: ("2001:db8::", "2001:db8::1") |
| }[version] |
| dstaddr = self.GetRandomDestination(dst_prefix) |
| |
| if use_connect: |
| s.connect((dstaddr, 1234)) |
| |
| payload = self.PAYLOAD_SIZE * "a" |
| |
| # Send a packet and receive a packet too big. |
| SendBigPacket(version, s, dstaddr, netid, payload) |
| received = self.ReadAllPacketsOn(netid) |
| self.assertEquals(1, len(received)) |
| _, toobig = packets.ICMPPacketTooBig(version, intermediate, srcaddr, |
| received[0]) |
| self.ReceivePacketOn(netid, toobig) |
| |
| # Check that another send on the same socket returns EMSGSIZE. |
| self.assertRaisesErrno( |
| errno.EMSGSIZE, |
| SendBigPacket, version, s, dstaddr, netid, payload) |
| |
| # If this is a connected socket, make sure the socket MTU was set. |
| # Note that in IPv4 this only started working in Linux 3.6! |
| if use_connect and (version == 6 or net_test.LINUX_VERSION >= (3, 6)): |
| self.assertEquals(1280, self.GetSocketMTU(version, s)) |
| |
| s.close() |
| |
| # Check that other sockets pick up the PMTU we have been told about by |
| # connecting another socket to the same destination and getting its MTU. |
| # This new socket can use any method to select its outgoing interface; |
| # here we use a mark for simplicity. |
| s2 = self.BuildSocket(version, net_test.UDPSocket, netid, "mark") |
| s2.connect((dstaddr, 1234)) |
| self.assertEquals(1280, self.GetSocketMTU(version, s2)) |
| |
| # Also check the MTU reported by ip route get, this time using the oif. |
| routes = self.iproute.GetRoutes(dstaddr, self.ifindices[netid], 0, None) |
| self.assertTrue(routes) |
| route = routes[0] |
| rtmsg, attributes = route |
| self.assertEquals(iproute.RTN_UNICAST, rtmsg.type) |
| metrics = attributes["RTA_METRICS"] |
| self.assertEquals(metrics["RTAX_MTU"], 1280) |
| |
| def testIPv4BasicPMTU(self): |
| """Tests IPv4 path MTU discovery. |
| |
| Relevant kernel commits: |
| upstream net-next: |
| 6a66271 ipv4, fib: pass LOOPBACK_IFINDEX instead of 0 to flowi4_iif |
| |
| android-3.10: |
| 4bc64dd ipv4, fib: pass LOOPBACK_IFINDEX instead of 0 to flowi4_iif |
| """ |
| |
| self.CheckPMTU(4, True, ["mark", "oif"]) |
| self.CheckPMTU(4, False, ["mark", "oif"]) |
| |
| def testIPv6BasicPMTU(self): |
| self.CheckPMTU(6, True, ["mark", "oif"]) |
| self.CheckPMTU(6, False, ["mark", "oif"]) |
| |
| @unittest.skipUnless(multinetwork_base.HAVE_UID_ROUTING, "no UID routes") |
| def testIPv4UIDPMTU(self): |
| self.CheckPMTU(4, True, ["uid"]) |
| self.CheckPMTU(4, False, ["uid"]) |
| |
| @unittest.skipUnless(multinetwork_base.HAVE_UID_ROUTING, "no UID routes") |
| def testIPv6UIDPMTU(self): |
| self.CheckPMTU(6, True, ["uid"]) |
| self.CheckPMTU(6, False, ["uid"]) |
| |
| # Making Path MTU Discovery work on unmarked sockets requires that mark |
| # reflection be enabled. Otherwise the kernel has no way to know what routing |
| # table the original packet used, and thus it won't be able to clone the |
| # correct route. |
| |
| def testIPv4UnmarkedSocketPMTU(self): |
| self.SetMarkReflectSysctls(1) |
| try: |
| self.CheckPMTU(4, False, [None]) |
| finally: |
| self.SetMarkReflectSysctls(0) |
| |
| def testIPv6UnmarkedSocketPMTU(self): |
| self.SetMarkReflectSysctls(1) |
| try: |
| self.CheckPMTU(6, False, [None]) |
| finally: |
| self.SetMarkReflectSysctls(0) |
| |
| |
| @unittest.skipUnless(multinetwork_base.HAVE_UID_ROUTING, "no UID routes") |
| class UidRoutingTest(multinetwork_base.MultiNetworkBaseTest): |
| """Tests that per-UID routing works properly. |
| |
| Relevant kernel commits: |
| android-3.4: |
| 0b42874 net: core: Support UID-based routing. |
| 0836a0c Handle 'sk' being NULL in UID-based routing. |
| |
| android-3.10: |
| 99a6ea4 net: core: Support UID-based routing. |
| 455b09d Handle 'sk' being NULL in UID-based routing. |
| """ |
| |
| def GetRulesAtPriority(self, version, priority): |
| rules = self.iproute.DumpRules(version) |
| out = [(rule, attributes) for rule, attributes in rules |
| if attributes.get("FRA_PRIORITY", 0) == priority] |
| return out |
| |
| def CheckInitialTablesHaveNoUIDs(self, version): |
| rules = [] |
| for priority in [0, 32766, 32767]: |
| rules.extend(self.GetRulesAtPriority(version, priority)) |
| for _, attributes in rules: |
| self.assertNotIn("FRA_UID_START", attributes) |
| self.assertNotIn("FRA_UID_END", attributes) |
| |
| def testIPv4InitialTablesHaveNoUIDs(self): |
| self.CheckInitialTablesHaveNoUIDs(4) |
| |
| def testIPv6InitialTablesHaveNoUIDs(self): |
| self.CheckInitialTablesHaveNoUIDs(6) |
| |
| def CheckGetAndSetRules(self, version): |
| def Random(): |
| return random.randint(1000000, 2000000) |
| |
| start, end = tuple(sorted([Random(), Random()])) |
| table = Random() |
| priority = Random() |
| |
| try: |
| self.iproute.UidRangeRule(version, True, start, end, table, |
| priority=priority) |
| |
| rules = self.GetRulesAtPriority(version, priority) |
| self.assertTrue(rules) |
| _, attributes = rules[-1] |
| self.assertEquals(priority, attributes["FRA_PRIORITY"]) |
| self.assertEquals(start, attributes["FRA_UID_START"]) |
| self.assertEquals(end, attributes["FRA_UID_END"]) |
| self.assertEquals(table, attributes["FRA_TABLE"]) |
| finally: |
| self.iproute.UidRangeRule(version, False, start, end, table, |
| priority=priority) |
| |
| def testIPv4GetAndSetRules(self): |
| self.CheckGetAndSetRules(4) |
| |
| def testIPv6GetAndSetRules(self): |
| self.CheckGetAndSetRules(6) |
| |
| def ExpectNoRoute(self, addr, oif, mark, uid): |
| # The lack of a route may be either an error, or an unreachable route. |
| try: |
| routes = self.iproute.GetRoutes(addr, oif, mark, uid) |
| rtmsg, _ = routes[0] |
| self.assertEquals(iproute.RTN_UNREACHABLE, rtmsg.type) |
| except IOError, e: |
| if int(e.errno) != -int(errno.ENETUNREACH): |
| raise e |
| |
| def ExpectRoute(self, addr, oif, mark, uid): |
| routes = self.iproute.GetRoutes(addr, oif, mark, uid) |
| rtmsg, _ = routes[0] |
| self.assertEquals(iproute.RTN_UNICAST, rtmsg.type) |
| |
| def CheckGetRoute(self, version, addr): |
| self.ExpectNoRoute(addr, 0, 0, 0) |
| for netid in self.NETIDS: |
| uid = self.UidForNetid(netid) |
| self.ExpectRoute(addr, 0, 0, uid) |
| self.ExpectNoRoute(addr, 0, 0, 0) |
| |
| def testIPv4RouteGet(self): |
| self.CheckGetRoute(4, net_test.IPV4_ADDR) |
| |
| def testIPv6RouteGet(self): |
| self.CheckGetRoute(6, net_test.IPV6_ADDR) |
| |
| |
| class RulesTest(net_test.NetworkTest): |
| |
| RULE_PRIORITY = 99999 |
| |
| def setUp(self): |
| self.iproute = iproute.IPRoute() |
| for version in [4, 6]: |
| self.iproute.DeleteRulesAtPriority(version, self.RULE_PRIORITY) |
| |
| def tearDown(self): |
| for version in [4, 6]: |
| self.iproute.DeleteRulesAtPriority(version, self.RULE_PRIORITY) |
| |
| def testRuleDeletionMatchesTable(self): |
| for version in [4, 6]: |
| # Add rules with mark 300 pointing at tables 301 and 302. |
| # This checks for a kernel bug where deletion request for tables > 256 |
| # ignored the table. |
| self.iproute.FwmarkRule(version, True, 300, 301, |
| priority=self.RULE_PRIORITY) |
| self.iproute.FwmarkRule(version, True, 300, 302, |
| priority=self.RULE_PRIORITY) |
| # Delete rule with mark 300 pointing at table 302. |
| self.iproute.FwmarkRule(version, False, 300, 302, |
| priority=self.RULE_PRIORITY) |
| # Check that the rule pointing at table 301 is still around. |
| attributes = [a for _, a in self.iproute.DumpRules(version) |
| if a.get("FRA_PRIORITY", 0) == self.RULE_PRIORITY] |
| self.assertEquals(1, len(attributes)) |
| self.assertEquals(301, attributes[0]["FRA_TABLE"]) |
| |
| |
| if __name__ == "__main__": |
| unittest.main() |
