--- /dev/null
+#!/usr/bin/env python3
+
+# Copyright (c) 2020 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.
+
+"""Traffic script for SRv6 verification."""
+
+import sys
+
+from scapy.layers.inet6 import IPv6, ICMPv6ND_NS, IPv6ExtHdrSegmentRouting,\
+ ipv6nh
+from scapy.layers.l2 import Ether
+from scapy.packet import Raw
+
+from .PacketVerifier import RxQueue, TxQueue
+from .TrafficScriptArg import TrafficScriptArg
+
+
+def check_srv6(
+ pkt_recv, src_mac, dst_mac, src_ip, dst_ip, dir_srcsid, dir_dstsid1,
+ dir_dstsid2, dir_dstsid3, segleft_corr, static_proxy=False):
+ """Check received SRv6 packet.
+
+ :param pkt_recv: Received packet to verify.
+ :param src_mac: Source MAC address.
+ :param dst_mac: Destination MAC address.
+ :param src_ip: Source IP/IPv6 address of original IP/IPv6 packet.
+ :param dst_ip: Destination IP/IPv6 address of original IP/IPv6 packet.
+ :param dir_srcsid: Source SID for SR in desired direction.
+ :param dir_dstsid1: Destination SID1 in desired direction.
+ :param dir_dstsid2: Destination SID2 in desired direction.
+ :param dir_dstsid3: Destination SID3 in desired direction.
+ :param segleft_corr: Correction for expected segleft value of SRH.
+ :type pkt_recv: scapy.Ether
+ :type src_mac: str
+ :type dst_mac: str
+ :type src_ip: str
+ :type dst_ip: str
+ :type dir_srcsid: str
+ :type dir_dstsid1: str
+ :type dir_dstsid2: str
+ :type dir_dstsid3: str
+ :type segleft_corr: int
+ :type static_proxy; bool
+ :raises RuntimeError: If received packet is invalid.
+ """
+ if pkt_recv[Ether].src != src_mac:
+ raise RuntimeError(
+ f"Received frame has invalid source MAC address: "
+ f"{pkt_recv[Ether].src} should be: {src_mac}"
+ )
+ if pkt_recv[Ether].dst != dst_mac:
+ raise RuntimeError(
+ f"Received frame has invalid destination MAC address: "
+ f"{pkt_recv[Ether].dst} should be: {dst_mac}"
+ )
+ if not pkt_recv.haslayer(IPv6):
+ raise RuntimeError(
+ f"Not an IPv6 packet received: {pkt_recv!r}"
+ )
+ ip6_pkt = pkt_recv[IPv6]
+ if ip6_pkt.src != dir_srcsid:
+ raise RuntimeError(
+ f"Outer IPv6 packet has invalid source address: "
+ f"{ip6_pkt.src} should be: {dir_srcsid}"
+ )
+ dir_dstsids = [dir_dstsid2, dir_dstsid1] if dir_dstsid3 == u"None" \
+ else [dir_dstsid3, dir_dstsid2, dir_dstsid1] if not static_proxy \
+ else [dir_dstsid3, dir_dstsid2]
+ segleft = len(dir_dstsids) - segleft_corr if not static_proxy \
+ else len(dir_dstsids) - segleft_corr + 1
+ if ip6_pkt.dst != dir_dstsids[segleft]:
+ raise RuntimeError(
+ f"Outer IPv6 packet has invalid destination address: "
+ f"{ip6_pkt.dst} should be: {dir_dstsids[segleft]}"
+ )
+ if dir_dstsid2 == u"None":
+ if ip6_pkt.haslayer(IPv6ExtHdrSegmentRouting):
+ raise RuntimeError(
+ f"Segment Routing Header in received packet: {pkt_recv!r}"
+ )
+ if ip6_pkt.nh != 41: # ipv6nh[41] == IPv6
+ raise RuntimeError(
+ f"Outer IPv6 packet has invalid next header: "
+ f"{ip6_pkt.nh} should be: 41 ({ipv6nh[41]})"
+ )
+ ip6_pkt = ip6_pkt[IPv6][1]
+ else:
+ if not pkt_recv.haslayer(IPv6ExtHdrSegmentRouting):
+ raise RuntimeError(
+ f"No Segment Routing Header in received packet: {pkt_recv!r}"
+ )
+ if ip6_pkt.nh != 43: # ipv6nh[43] == Routing Header
+ raise RuntimeError(
+ f"Outer IPv6 packet has invalid next header: "
+ f"{pkt_recv[IPv6][0].nh} should be: 43 ({ipv6nh[43]})"
+ )
+ ip6_pkt = ip6_pkt[IPv6ExtHdrSegmentRouting]
+ if ip6_pkt.addresses != dir_dstsids:
+ raise RuntimeError(
+ f"Segment Routing Header has invalid addresses: "
+ f"{ip6_pkt.addresses} should be: {dir_dstsids}"
+ )
+ if ip6_pkt.segleft != segleft:
+ raise RuntimeError(
+ f"Segment Routing Header has invalid segleft value: "
+ f"{ip6_pkt.segleft} should be: {segleft}"
+ )
+ if ip6_pkt.nh != 41: # ipv6nh[41] == IPv6
+ raise RuntimeError(
+ f"Segment Routing Header has invalid next header: "
+ f"{ip6_pkt.nh} should be: 41 ({ipv6nh[41]})"
+ )
+ ip6_pkt = ip6_pkt[IPv6]
+ if ip6_pkt.src != src_ip:
+ raise RuntimeError(
+ f"Inner IPv6 packet has invalid source address: "
+ f"{ip6_pkt.src} should be: {src_ip}"
+ )
+ if ip6_pkt.dst != dst_ip:
+ raise RuntimeError(
+ f"Inner IPv6 packet has invalid destination address: "
+ f"{ip6_pkt.dst} should be: {dst_ip}"
+ )
+ if ip6_pkt.nh != 59: # ipv6nh[59] == No Next Header
+ raise RuntimeError(
+ f"Inner IPv6 packet has invalid next header: "
+ f"{ip6_pkt.nh} should be: 59 ({ipv6nh[59]})"
+ )
+
+
+def check_ip(pkt_recv, src_mac, dst_mac, src_ip, dst_ip):
+ """Check received IPv6 packet.
+
+ :param pkt_recv: Received packet to verify.
+ :param src_mac: Source MAC address.
+ :param dst_mac: Destination MAC address.
+ :param src_ip: Source IP/IPv6 address.
+ :param dst_ip: Destination IP/IPv6 address.
+ :type pkt_recv: scapy.Ether
+ :type src_mac: str
+ :type dst_mac: str
+ :type src_ip: str
+ :type dst_ip: str
+ :raises RuntimeError: If received packet is invalid.
+ """
+ if pkt_recv[Ether].src != src_mac:
+ raise RuntimeError(
+ f"Received frame has invalid source MAC address: "
+ f"{pkt_recv[Ether].src} should be: {src_mac}"
+ )
+
+ if pkt_recv[Ether].dst != dst_mac:
+ raise RuntimeError(
+ f"Received frame has invalid destination MAC address: "
+ f"{pkt_recv[Ether].dst} should be: {dst_mac}"
+ )
+
+ if not pkt_recv.haslayer(IPv6):
+ raise RuntimeError(
+ f"Not an {IPv6.name} packet received: {pkt_recv!r}"
+ )
+
+ if pkt_recv[IPv6].dst != dst_ip:
+ raise RuntimeError(
+ f"Received packet has invalid destination address: "
+ f"{pkt_recv[IPv6.name].dst} should be: {dst_ip}"
+ )
+
+ if pkt_recv[IPv6].src != src_ip:
+ raise RuntimeError(
+ f"Received packet has invalid destination address: "
+ f"{pkt_recv[IPv6.name].dst} should be: {src_ip}"
+ )
+
+ if pkt_recv[IPv6].nh != 59: # ipv6nh[59] == No Next Header
+ raise RuntimeError(
+ f"Received IPv6 packet has invalid next header: "
+ f"{IPv6.nh} should be: 59 ({ipv6nh[59]})"
+ )
+
+
+def main():
+ """Send, receive and check IPv6 and IPv6ExtHdrSegmentRouting packets."""
+
+ args = TrafficScriptArg(
+ [
+ u"tx_src_mac", u"tx_dst_mac", u"rx_src_mac", u"rx_dst_mac",
+ u"src_ip", u"dst_ip", u"dir0_srcsid", u"dir0_dstsid1",
+ u"dir0_dstsid2", u"dir1_srcsid", u"dir1_dstsid1", u"dir1_dstsid2",
+ u"decap", u"dir0_dstsid3", u"dir1_dstsid3", u"static_proxy"
+ ]
+ )
+
+ tx_txq = TxQueue(args.get_arg(u"tx_if"))
+ tx_rxq = RxQueue(args.get_arg(u"tx_if"))
+ rx_txq = TxQueue(args.get_arg(u"rx_if"))
+ rx_rxq = RxQueue(args.get_arg(u"rx_if"))
+
+ tx_src_mac = args.get_arg(u"tx_src_mac")
+ tx_dst_mac = args.get_arg(u"tx_dst_mac")
+ rx_src_mac = args.get_arg(u"rx_src_mac")
+ rx_dst_mac = args.get_arg(u"rx_dst_mac")
+ src_ip = args.get_arg(u"src_ip")
+ dst_ip = args.get_arg(u"dst_ip")
+
+ dir0_srcsid = args.get_arg(u"dir0_srcsid")
+ dir0_dstsid1 = args.get_arg(u"dir0_dstsid1")
+ dir0_dstsid2 = args.get_arg(u"dir0_dstsid2")
+ dir1_srcsid = args.get_arg(u"dir1_srcsid")
+ dir1_dstsid1 = args.get_arg(u"dir1_dstsid1")
+ dir1_dstsid2 = args.get_arg(u"dir1_dstsid2")
+ decap = args.get_arg(u"decap")
+ dir0_dstsid3 = args.get_arg(u"dir0_dstsid3")
+ dir1_dstsid3 = args.get_arg(u"dir1_dstsid3")
+ static_proxy = args.get_arg(u"static_proxy")
+
+ ip_pkt = IPv6(src=src_ip, dst=dst_ip)
+
+ sent_packets = list()
+ tx_pkt_send = (Ether(src=tx_src_mac, dst=tx_dst_mac) / ip_pkt)
+ tx_pkt_send /= Raw()
+ size_limit = 78
+ if len(tx_pkt_send) < size_limit:
+ tx_pkt_send[Raw].load += (b"\0" * (size_limit - len(tx_pkt_send)))
+ sent_packets.append(tx_pkt_send)
+ tx_txq.send(tx_pkt_send)
+
+ while True:
+ rx_pkt_recv = rx_rxq.recv(2)
+
+ if rx_pkt_recv is None:
+ raise RuntimeError(f"{IPv6.name} packet Rx timeout")
+
+ if rx_pkt_recv.haslayer(ICMPv6ND_NS):
+ # read another packet in the queue if the current one is ICMPv6ND_NS
+ continue
+ else:
+ # otherwise process the current packet
+ break
+
+ check_srv6(
+ rx_pkt_recv, rx_src_mac, rx_dst_mac, src_ip, dst_ip, dir0_srcsid,
+ dir0_dstsid1, dir0_dstsid2, dir0_dstsid3, 1
+ )
+
+ ip_pkt = IPv6(src=dst_ip, dst=src_ip)
+ ip_pkt /= Raw()
+ if len(ip_pkt) < (size_limit - 14):
+ ip_pkt[Raw].load += (b"\0" * (size_limit - 14 - len(ip_pkt)))
+
+ rx_pkt_send = (
+ Ether(src=rx_dst_mac, dst=rx_src_mac) /
+ IPv6(src=dir1_srcsid, dst=dir1_dstsid1) /
+ IPv6ExtHdrSegmentRouting(
+ segleft=1 if dir1_dstsid3 == u"None" else 2,
+ lastentry=1 if dir1_dstsid3 == u"None" else 2,
+ addresses=[dir1_dstsid2, dir1_dstsid1]
+ if dir1_dstsid3 == u"None"
+ else [dir1_dstsid3, dir1_dstsid2, dir1_dstsid1]
+ ) /
+ ip_pkt
+ ) if dir1_dstsid2 != u"None" else (
+ Ether(src=rx_dst_mac, dst=rx_src_mac) /
+ IPv6(src=dir1_srcsid, dst=dir1_dstsid1) /
+ ip_pkt
+ )
+ rx_txq.send(rx_pkt_send)
+
+ while True:
+ tx_pkt_recv = tx_rxq.recv(2, ignore=sent_packets)
+
+ if tx_pkt_recv is None:
+ raise RuntimeError(f"{IPv6.name} packet Rx timeout")
+
+ if tx_pkt_recv.haslayer(ICMPv6ND_NS):
+ # read another packet in the queue if the current one is ICMPv6ND_NS
+ continue
+ else:
+ # otherwise process the current packet
+ break
+
+ if decap == u"True":
+ check_ip(tx_pkt_recv, tx_dst_mac, tx_src_mac, dst_ip, src_ip)
+ else:
+ check_srv6(
+ tx_pkt_recv, tx_dst_mac, tx_src_mac, dst_ip, src_ip, dir1_srcsid,
+ dir1_dstsid1, dir1_dstsid2, dir1_dstsid3, 2,
+ bool(static_proxy == u"True")
+ )
+
+ sys.exit(0)
+
+
+if __name__ == u"__main__":
+ main()
Code Review / csit.git / blobdiff