| #!/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.getmulticast({"ifa-family": socket.AF_INET}, dump=True) |
| |
| all_host_multicasts = [ |
| addr for addr in addresses if addr['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() |
