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selftests: net: add test for IPv4 devconf netlink notifications

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Introduce a new test, `ipv4_devconf_notify`, to verify that the kernel
sends the appropriate netlink notifications when IPv4 devconf parameters
are modified.

The test depends on the newly introduced iproute2 command:

`ip link set dev <ifname> inet`

Signed-off-by: Fernando Fernandez Mancera <fmancera@suse.de>
Link: https://patch.msgid.link/20260609204520.4670-3-fmancera@suse.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Fernando Fernandez Mancera 2026-06-09 22:45:20 +02:00 committed by Jakub Kicinski
parent 489730ec2a
commit 32229484e3
1 changed files with 37 additions and 4 deletions
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41
tools/testing/selftests/net/rtnetlink.py
View File

@ -1,17 +1,20 @@
#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0
from lib.py import ksft_exit, ksft_run, ksft_ge, RtnlAddrFamily
import socket
import time
from lib.py import bkg, ip, ksft_exit, ksft_run, ksft_ge, ksft_true, KsftSkipEx
from lib.py import CmdExitFailure, NetNS, NetNSEnter, RtnlAddrFamily
IPV4_ALL_HOSTS_MULTICAST = b'\xe0\x00\x00\x01'
def dump_mcaddr_check(rtnl: RtnlAddrFamily) -> None:
def dump_mcaddr_check() -> None:
"""
Verify that at least one interface has the IPv4 all-hosts multicast address.
At least the loopback interface should have this address.
"""
rtnl = RtnlAddrFamily()
addresses = rtnl.getmulticast({"ifa-family": socket.AF_INET}, dump=True)
all_host_multicasts = [
@ -21,9 +24,39 @@ def dump_mcaddr_check(rtnl: RtnlAddrFamily) -> None:
ksft_ge(len(all_host_multicasts), 1,
"No interface found with the IPv4 all-hosts multicast address")
def ipv4_devconf_notify() -> None:
"""
Configure an interface and set ipv4-devconf values through netlink
to verify that the appropriate netlink notifications are being sent.
"""
with NetNS() as ns:
with NetNSEnter(str(ns)):
ifname = "dummy1"
ip(f"link add name {ifname} type dummy", ns=str(ns))
with bkg("ip monitor", ns=str(ns)) as cmd_obj:
time.sleep(1)
try:
ip(f"link set dev {ifname} inet forwarding on")
ip(f"link set dev {ifname} inet proxy_arp on")
ip(f"link set dev {ifname} inet rp_filter 1")
ip(f"link set dev {ifname} inet ignore_routes_with_linkdown on")
except CmdExitFailure:
raise KsftSkipEx("iproute2 does not support IPv4 devconf attributes")
time.sleep(1)
ksft_true(f"inet {ifname} ignore_routes_with_linkdown on" in cmd_obj.stdout,
f"No 'ignore_routes_with_linkdown on' notificiation found for interface {ifname}")
ksft_true(f"inet {ifname} rp_filter strict" in cmd_obj.stdout,
f"No 'rp_filter strict' notificiation found for interface {ifname}")
ksft_true(f"inet {ifname} proxy_neigh on" in cmd_obj.stdout,
f"No 'proxy_neigh on' notificiation found for interface {ifname}")
ksft_true(f"inet {ifname} forwarding on" in cmd_obj.stdout,
f"No 'forwarding on' notificiation found for interface {ifname}")
def main() -> None:
rtnl = RtnlAddrFamily()
ksft_run([dump_mcaddr_check], args=(rtnl, ))
ksft_run([dump_mcaddr_check, ipv4_devconf_notify])
ksft_exit()
if __name__ == "__main__":