summaryrefslogtreecommitdiffstats
path: root/test/vpp_pg_interface.py
blob: 44bd1a2d520c3c520827c640d049454d994341ef (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
import os
import time
from scapy.utils import wrpcap, rdpcap, PcapReader
from vpp_interface import VppInterface

from scapy.layers.l2 import Ether, ARP
from scapy.layers.inet6 import IPv6, ICMPv6ND_NS, ICMPv6ND_NA,\
    ICMPv6NDOptSrcLLAddr, ICMPv6NDOptDstLLAddr
from util import ppp, ppc


class VppPGInterface(VppInterface):
    """
    VPP packet-generator interface
    """

    @property
    def pg_index(self):
        """packet-generator interface index assigned by VPP"""
        return self._pg_index

    @property
    def out_path(self):
        """pcap file path - captured packets"""
        return self._out_path

    @property
    def in_path(self):
        """ pcap file path - injected packets"""
        return self._in_path

    @property
    def capture_cli(self):
        """CLI string to start capture on this interface"""
        return self._capture_cli

    @property
    def cap_name(self):
        """capture name for this interface"""
        return self._cap_name

    @property
    def input_cli(self):
        """CLI string to load the injected packets"""
        return self._input_cli

    @property
    def in_history_counter(self):
        """Self-incrementing counter used when renaming old pcap files"""
        v = self._in_history_counter
        self._in_history_counter += 1
        return v

    @property
    def out_history_counter(self):
        """Self-incrementing counter used when renaming old pcap files"""
        v = self._out_history_counter
        self._out_history_counter += 1
        return v

    def __init__(self, test, pg_index):
        """ Create VPP packet-generator interface """
        r = test.vapi.pg_create_interface(pg_index)
        self._sw_if_index = r.sw_if_index

        super(VppPGInterface, self).__init__(test)

        self._in_history_counter = 0
        self._out_history_counter = 0
        self._pg_index = pg_index
        self._out_file = "pg%u_out.pcap" % self.pg_index
        self._out_path = self.test.tempdir + "/" + self._out_file
        self._in_file = "pg%u_in.pcap" % self.pg_index
        self._in_path = self.test.tempdir + "/" + self._in_file
        self._capture_cli = "packet-generator capture pg%u pcap %s" % (
            self.pg_index, self.out_path)
        self._cap_name = "pcap%u" % self.sw_if_index
        self._input_cli = "packet-generator new pcap %s source pg%u name %s" % (
            self.in_path, self.pg_index, self.cap_name)

    def enable_capture(self):
        """ Enable capture on this packet-generator interface"""
        try:
            if os.path.isfile(self.out_path):
                os.rename(self.out_path,
                          "%s/history.[timestamp:%f].[%s-counter:%04d].%s" %
                          (self.test.tempdir,
                           time.time(),
                           self.name,
                           self.out_history_counter,
                           self._out_file))
        except:
            pass
        # FIXME this should be an API, but no such exists atm
        self.test.vapi.cli(self.capture_cli)
        self._pcap_reader = None

    def add_stream(self, pkts):
        """
        Add a stream of packets to this packet-generator

        :param pkts: iterable packets

        """
        try:
            if os.path.isfile(self.in_path):
                os.rename(self.in_path,
                          "%s/history.[timestamp:%f].[%s-counter:%04d].%s" %
                          (self.test.tempdir,
                           time.time(),
                           self.name,
                           self.in_history_counter,
                           self._in_file))
        except:
            pass
        wrpcap(self.in_path, pkts)
        self.test.register_capture(self.cap_name)
        # FIXME this should be an API, but no such exists atm
        self.test.vapi.cli(self.input_cli)

    def get_capture(self, remark=None):
        """
        Get captured packets

        :returns: iterable packets
        """
        try:
            self.wait_for_capture_file()
            output = rdpcap(self.out_path)
        except IOError:  # TODO
            self.test.logger.debug("File %s does not exist, probably because no"
                                   " packets arrived" % self.out_path)
            if remark:
                raise Exception("No packets captured on %s(%s)" %
                                (self.name, remark))
            else:
                raise Exception("No packets captured on %s" % self.name)
        return output

    def assert_nothing_captured(self, remark=None):
        if os.path.isfile(self.out_path):
            try:
                capture = self.get_capture()
                self.test.logger.error(
                    ppc("Unexpected packets captured:", capture))
            except:
                pass
            if remark:
                raise AssertionError(
                    "Capture file present for interface %s(%s)" %
                    (self.name, remark))
            else:
                raise AssertionError("Capture file present for interface %s" %
                                     self.name)

    def wait_for_capture_file(self, timeout=1):
        """
        Wait until pcap capture file appears

        :param timeout: How long to wait for the packet (default 1s)

        :raises Exception: if the capture file does not appear within timeout
        """
        limit = time.time() + timeout
        if not os.path.isfile(self.out_path):
            self.test.logger.debug(
                "Waiting for capture file to appear, timeout is %ss", timeout)
        else:
            self.test.logger.debug("Capture file already exists")
            return
        while time.time() < limit:
            if os.path.isfile(self.out_path):
                break
            time.sleep(0)  # yield
        if os.path.isfile(self.out_path):
            self.test.logger.debug("Capture file appeared after %fs" %
                                   (time.time() - (limit - timeout)))
        else:
            self.test.logger.debug("Timeout - capture file still nowhere")
            raise Exception("Capture file did not appear within timeout")

    def wait_for_packet(self, timeout):
        """
        Wait for next packet captured with a timeout

        :param timeout: How long to wait for the packet

        :returns: Captured packet if no packet arrived within timeout
        :raises Exception: if no packet arrives within timeout
        """
        limit = time.time() + timeout
        if self._pcap_reader is None:
            self.wait_for_capture_file(timeout)
            self._pcap_reader = PcapReader(self.out_path)

        self.test.logger.debug("Waiting for packet")
        while time.time() < limit:
            p = self._pcap_reader.recv()
            if p is not None:
                self.test.logger.debug("Packet received after %fs",
                                       (time.time() - (limit - timeout)))
                return p
            time.sleep(0)  # yield
        self.test.logger.debug("Timeout - no packets received")
        raise Exception("Packet didn't arrive within timeout")

    def create_arp_req(self):
        """Create ARP request applicable for this interface"""
        return (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.remote_mac) /
                ARP(op=ARP.who_has, pdst=self.local_ip4,
                    psrc=self.remote_ip4, hwsrc=self.remote_mac))

    def create_ndp_req(self):
        """Create NDP - NS applicable for this interface"""
        return (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.remote_mac) /
                IPv6(src=self.remote_ip6, dst=self.local_ip6) /
                ICMPv6ND_NS(tgt=self.local_ip6) /
                ICMPv6NDOptSrcLLAddr(lladdr=self.remote_mac))

    def resolve_arp(self, pg_interface=None):
        """Resolve ARP using provided packet-generator interface

        :param pg_interface: interface used to resolve, if None then this
            interface is used

        """
        if pg_interface is None:
            pg_interface = self
        self.test.logger.info("Sending ARP request for %s on port %s" %
                              (self.local_ip4, pg_interface.name))
        arp_req = self.create_arp_req()
        pg_interface.add_stream(arp_req)
        pg_interface.enable_capture()
        self.test.pg_start()
        self.test.logger.info(self.test.vapi.cli("show trace"))
        try:
            arp_reply = pg_interface.get_capture()
        except:
            self.test.logger.info("No ARP received on port %s" %
                                  pg_interface.name)
            return
        arp_reply = arp_reply[0]
        # Make Dot1AD packet content recognizable to scapy
        if arp_reply.type == 0x88a8:
            arp_reply.type = 0x8100
            arp_reply = Ether(str(arp_reply))
        try:
            if arp_reply[ARP].op == ARP.is_at:
                self.test.logger.info("VPP %s MAC address is %s " %
                                      (self.name, arp_reply[ARP].hwsrc))
                self._local_mac = arp_reply[ARP].hwsrc
            else:
                self.test.logger.info(
                    "No ARP received on port %s" %
                    pg_interface.name)
        except:
            self.test.logger.error(
                ppp("Unexpected response to ARP request:", arp_reply))
            raise

    def resolve_ndp(self, pg_interface=None):
        """Resolve NDP using provided packet-generator interface

        :param pg_interface: interface used to resolve, if None then this
            interface is used

        """
        if pg_interface is None:
            pg_interface = self
        self.test.logger.info("Sending NDP request for %s on port %s" %
                              (self.local_ip6, pg_interface.name))
        ndp_req = self.create_ndp_req()
        pg_interface.add_stream(ndp_req)
        pg_interface.enable_capture()
        self.test.pg_start()
        self.test.logger.info(self.test.vapi.cli("show trace"))
        replies = pg_interface.get_capture()
        if replies is None or len(replies) == 0:
            self.test.logger.info(
                "No NDP received on port %s" %
                pg_interface.name)
            return
        # Enabling IPv6 on an interface can generate more than the
        # ND reply we are looking for (namely MLD). So loop through
        # the replies to look for want we want.
        for ndp_reply in replies:
            # Make Dot1AD packet content recognizable to scapy
            if ndp_reply.type == 0x88a8:
                ndp_reply.type = 0x8100
                ndp_reply = Ether(str(ndp_reply))
            try:
                ndp_na = ndp_reply[ICMPv6ND_NA]
                opt = ndp_na[ICMPv6NDOptDstLLAddr]
                self.test.logger.info("VPP %s MAC address is %s " %
                                      (self.name, opt.lladdr))
                self._local_mac = opt.lladdr
            except:
                self.test.logger.info(
                    ppp("Unexpected response to NDP request:", ndp_reply))
        # if no packets above provided the local MAC, then this failed.
        if not hasattr(self, '_local_mac'):
            raise