+++ /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 resources.libraries.python.PacketVerifier import RxQueue, TxQueue
-from resources.libraries.python.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