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selftests: net: add a test case for nsid in all nsid notifications

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The test subscribes to link events from all namespaces and makes
sure that local events do not carry NSID in their ancillary data
(even if there is a self-referential NSID allocated for the local
namespace), and remote events do.

Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Link: https://patch.msgid.link/20260520172317.175168-5-i.maximets@ovn.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ilya Maximets 2026-05-20 19:22:38 +02:00 committed by Jakub Kicinski
parent 88b126b39f
commit 2e43b64248
1 changed files with 59 additions and 2 deletions
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61
tools/testing/selftests/net/link_netns.py
View File

@ -3,13 +3,14 @@
import time
from lib.py import ksft_run, ksft_exit, ksft_true
from lib.py import ksft_run, ksft_exit, ksft_eq, ksft_true
from lib.py import ip
from lib.py import NetNS, NetNSEnter
from lib.py import RtnlFamily
LINK_NETNSID = 100
LINK_NETNSID2 = 200
def test_event() -> None:
@ -32,6 +33,57 @@ def test_event() -> None:
"Received unexpected link notification")
def test_event_all_nsid() -> None:
"""NETLINK_LISTEN_ALL_NSID notifications: local events must not
carry nsid even with a self-referential mapping. Remote events
must carry the correct nsid."""
with NetNS() as ns1, NetNS() as ns2:
net1, net2 = str(ns1), str(ns2)
with NetNSEnter(net1):
rtnl = RtnlFamily()
rtnl.ntf_listen_all_nsid()
rtnl.ntf_subscribe("rtnlgrp-link")
# Case 1: no nsid assigned, local event, no nsid expected.
ip("link add dummy-lo type dummy", ns=net1)
# Case 2: self-referential nsid, local event, still no nsid.
ip(f"netns set {net1} {LINK_NETNSID}", ns=net1)
ip("link add dummy-sr type dummy", ns=net1)
# Case 3: remote event, nsid present.
ip(f"netns set {net2} {LINK_NETNSID2}", ns=net1)
ip("link add dummy-re type dummy", ns=net2)
# Collect the three newlink events, ignoring unrelated noise.
events = {}
for msg in rtnl.poll_ntf(duration=1):
if msg['name'] == 'getlink':
ifname = msg['msg'].get('ifname')
if ifname in ('dummy-lo', 'dummy-sr', 'dummy-re'):
events[ifname] = msg
if len(events) == 3:
break
ksft_true('dummy-lo' in events, "missing local event")
ksft_true(events['dummy-lo'].get('nsid') is None,
"local event without nsid should not carry nsid")
ksft_true('dummy-sr' in events, "missing self-ref event")
ksft_true(events['dummy-sr'].get('nsid') is None,
"local event with self-ref nsid should not carry nsid")
ksft_true('dummy-re' in events, "missing remote event")
ksft_eq(events['dummy-re'].get('nsid'), LINK_NETNSID2,
"remote event should carry nsid")
ip("link del dummy-lo", ns=net1)
ip("link del dummy-sr", ns=net1)
ip("link del dummy-re", ns=net2)
def validate_link_netns(netns, ifname, link_netnsid) -> bool:
link_info = ip(f"-d link show dev {ifname}", ns=netns, json=True)
if not link_info:
@ -133,7 +185,12 @@ def test_peer_net() -> None:
def main() -> None:
ksft_run([test_event, test_link_net, test_peer_net])
ksft_run([
test_event,
test_event_all_nsid,
test_link_net,
test_peer_net,
])
ksft_exit()