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#
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (c) 2024 Klara, Inc.
#
import argparse
import scapy.all as sp
import sys
#
# Emit a router advertisement with the specified prefix.
#
def main():
parser = argparse.ArgumentParser("ra.py",
description="Emits Router Advertisement packets")
parser.add_argument('--sendif', nargs=1, required=True,
help='The interface through which the packet will be sent')
parser.add_argument('--src', nargs=1, required=True,
help='The source IP address')
parser.add_argument('--dst', nargs=1, required=True,
help='The destination IP address')
parser.add_argument('--prefix', nargs=1, required=True,
help='The prefix to be advertised')
parser.add_argument('--prefixlen', nargs=1, required=True, type=int,
help='The prefix length to be advertised')
parser.add_argument('--validlifetime', nargs=1, required=False,
type=int, default=4294967295,
help='The valid lifetime of the prefix')
parser.add_argument('--preferredlifetime', nargs=1, required=False,
type=int, default=4294967295,
help='The preferred lifetime of the prefix')
args = parser.parse_args()
pkt = sp.Ether() / \
sp.IPv6(src=args.src, dst=args.dst) / \
sp.ICMPv6ND_RA(chlim=64) / \
sp.ICMPv6NDOptPrefixInfo(prefix=args.prefix,
prefixlen=args.prefixlen,
validlifetime=args.validlifetime,
preferredlifetime=args.preferredlifetime)
sp.sendp(pkt, iface=args.sendif[0], verbose=False)
sys.exit(0)
if __name__ == '__main__':
main()
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