1#!/usr/bin/env python3 2# SPDX-License-Identifier: GPL-2.0 3 4import socket 5import time 6from lib.py import bkg, ip, ksft_exit, ksft_run, ksft_ge, ksft_true, KsftSkipEx 7from lib.py import CmdExitFailure, NetNS, NetNSEnter, RtnlAddrFamily 8 9IPV4_ALL_HOSTS_MULTICAST = b'\xe0\x00\x00\x01' 10 11def dump_mcaddr_check() -> None: 12 """ 13 Verify that at least one interface has the IPv4 all-hosts multicast address. 14 At least the loopback interface should have this address. 15 """ 16 17 rtnl = RtnlAddrFamily() 18 addresses = rtnl.getmulticast({"ifa-family": socket.AF_INET}, dump=True) 19 20 all_host_multicasts = [ 21 addr for addr in addresses if addr['multicast'] == IPV4_ALL_HOSTS_MULTICAST 22 ] 23 24 ksft_ge(len(all_host_multicasts), 1, 25 "No interface found with the IPv4 all-hosts multicast address") 26 27def ipv4_devconf_notify() -> None: 28 """ 29 Configure an interface and set ipv4-devconf values through netlink 30 to verify that the appropriate netlink notifications are being sent. 31 """ 32 33 with NetNS() as ns: 34 with NetNSEnter(str(ns)): 35 ifname = "dummy1" 36 ip(f"link add name {ifname} type dummy", ns=str(ns)) 37 38 with bkg("ip monitor", ns=str(ns)) as cmd_obj: 39 time.sleep(1) 40 try: 41 ip(f"link set dev {ifname} inet forwarding on") 42 ip(f"link set dev {ifname} inet proxy_arp on") 43 ip(f"link set dev {ifname} inet rp_filter 1") 44 ip(f"link set dev {ifname} inet ignore_routes_with_linkdown on") 45 except CmdExitFailure: 46 raise KsftSkipEx("iproute2 does not support IPv4 devconf attributes") 47 time.sleep(1) 48 49 ksft_true(f"inet {ifname} ignore_routes_with_linkdown on" in cmd_obj.stdout, 50 f"No 'ignore_routes_with_linkdown on' notificiation found for interface {ifname}") 51 ksft_true(f"inet {ifname} rp_filter strict" in cmd_obj.stdout, 52 f"No 'rp_filter strict' notificiation found for interface {ifname}") 53 ksft_true(f"inet {ifname} proxy_neigh on" in cmd_obj.stdout, 54 f"No 'proxy_neigh on' notificiation found for interface {ifname}") 55 ksft_true(f"inet {ifname} forwarding on" in cmd_obj.stdout, 56 f"No 'forwarding on' notificiation found for interface {ifname}") 57 58def main() -> None: 59 ksft_run([dump_mcaddr_check, ipv4_devconf_notify]) 60 ksft_exit() 61 62if __name__ == "__main__": 63 main() 64