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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0
from lib.py import ksft_exit, ksft_run, ksft_ge, RtnlAddrFamily
import socket
IPV4_ALL_HOSTS_MULTICAST = b'\xe0\x00\x00\x01'
def dump_mcaddr_check(rtnl: RtnlAddrFamily) -> None:
"""
Verify that at least one interface has the IPv4 all-hosts multicast address.
At least the loopback interface should have this address.
"""
addresses = rtnl.getmaddrs({"ifa-family": socket.AF_INET}, dump=True)
all_host_multicasts = [
addr for addr in addresses if addr['ifa-multicast'] == IPV4_ALL_HOSTS_MULTICAST
]
ksft_ge(len(all_host_multicasts), 1,
"No interface found with the IPv4 all-hosts multicast address")
def main() -> None:
rtnl = RtnlAddrFamily()
ksft_run([dump_mcaddr_check], args=(rtnl, ))
ksft_exit()
if __name__ == "__main__":
main()
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