Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#!/usr/bin/env python3
2# SPDX-License-Identifier: GPL-2.0
3
4from lib.py import ksft_exit, ksft_run, ksft_ge, RtnlAddrFamily
5import socket
6
7IPV4_ALL_HOSTS_MULTICAST = b'\xe0\x00\x00\x01'
8
9def dump_mcaddr_check(rtnl: RtnlAddrFamily) -> None:
10 """
11 Verify that at least one interface has the IPv4 all-hosts multicast address.
12 At least the loopback interface should have this address.
13 """
14
15 addresses = rtnl.getmulticast({"ifa-family": socket.AF_INET}, dump=True)
16
17 all_host_multicasts = [
18 addr for addr in addresses if addr['multicast'] == IPV4_ALL_HOSTS_MULTICAST
19 ]
20
21 ksft_ge(len(all_host_multicasts), 1,
22 "No interface found with the IPv4 all-hosts multicast address")
23
24def main() -> None:
25 rtnl = RtnlAddrFamily()
26 ksft_run([dump_mcaddr_check], args=(rtnl, ))
27 ksft_exit()
28
29if __name__ == "__main__":
30 main()