tools/testing/selftests/net/link_netns.py

#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0

import time

from lib.py import ksft_run, ksft_exit, ksft_true
from lib.py import ip
from lib.py import NetNS, NetNSEnter
from lib.py import RtnlFamily


LINK_NETNSID = 100


def test_event() -> None:
    with NetNS() as ns1, NetNS() as ns2:
        with NetNSEnter(str(ns2)):
            rtnl = RtnlFamily()

        rtnl.ntf_subscribe("rtnlgrp-link")

        ip(f"netns set {ns2} {LINK_NETNSID}", ns=str(ns1))
        ip(f"link add netns {ns1} link-netnsid {LINK_NETNSID} dummy1 type dummy")
        ip(f"link add netns {ns1} dummy2 type dummy", ns=str(ns2))

        ip("link del dummy1", ns=str(ns1))
        ip("link del dummy2", ns=str(ns1))

        time.sleep(1)
        rtnl.check_ntf()
        ksft_true(rtnl.async_msg_queue.empty(),
                  "Received unexpected link notification")


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:
        return False
    return link_info[0].get("link_netnsid") == link_netnsid


def test_link_net() -> None:
    configs = [
        # type, common args, type args, fallback to dev_net
        ("ipvlan", "link dummy1", "", False),
        ("macsec", "link dummy1", "", False),
        ("macvlan", "link dummy1", "", False),
        ("macvtap", "link dummy1", "", False),
        ("vlan", "link dummy1", "id 100", False),
        ("gre", "", "local 192.0.2.1", True),
        ("vti", "", "local 192.0.2.1", True),
        ("ipip", "", "local 192.0.2.1", True),
        ("ip6gre", "", "local 2001:db8::1", True),
        ("ip6tnl", "", "local 2001:db8::1", True),
        ("vti6", "", "local 2001:db8::1", True),
        ("sit", "", "local 192.0.2.1", True),
        ("xfrm", "", "if_id 1", True),
    ]

    with NetNS() as ns1, NetNS() as ns2, NetNS() as ns3:
        net1, net2, net3 = str(ns1), str(ns2), str(ns3)

        # prepare link netnsid  and a dummy link needed by certain drivers
        ip(f"netns set {net3} {LINK_NETNSID}", ns=str(net2))
        ip("link add dummy1 type dummy", ns=net3)

        cases = [
            # source, "netns", "link-netns", expected link-netns
            (net3, None, None, None, None),
            (net3, net2, None, None, LINK_NETNSID),
            (net2, None, net3, LINK_NETNSID, LINK_NETNSID),
            (net1, net2, net3, LINK_NETNSID, LINK_NETNSID),
        ]

        for src_net, netns, link_netns, exp1, exp2 in cases:
            tgt_net = netns or src_net
            for typ, cargs, targs, fb_dev_net in configs:
                cmd = "link add"
                if netns:
                    cmd += f" netns {netns}"
                if link_netns:
                    cmd += f" link-netns {link_netns}"
                cmd += f" {cargs} foo type {typ} {targs}"
                ip(cmd, ns=src_net)
                if fb_dev_net:
                    ksft_true(validate_link_netns(tgt_net, "foo", exp1),
                              f"{typ} link_netns validation failed")
                else:
                    ksft_true(validate_link_netns(tgt_net, "foo", exp2),
                              f"{typ} link_netns validation failed")
                ip(f"link del foo", ns=tgt_net)


def test_peer_net() -> None:
    types = [
        "vxcan",
        "netkit",
        "veth",
    ]

    with NetNS() as ns1, NetNS() as ns2, NetNS() as ns3, NetNS() as ns4:
        net1, net2, net3, net4 = str(ns1), str(ns2), str(ns3), str(ns4)

        ip(f"netns set {net3} {LINK_NETNSID}", ns=str(net2))

        cases = [
            # source, "netns", "link-netns", "peer netns", expected
            (net1, None, None, None, None),
            (net1, net2, None, None, None),
            (net2, None, net3, None, LINK_NETNSID),
            (net1, net2, net3, None, None),
            (net2, None, None, net3, LINK_NETNSID),
            (net1, net2, None, net3, LINK_NETNSID),
            (net2, None, net2, net3, LINK_NETNSID),
            (net1, net2, net4, net3, LINK_NETNSID),
        ]

        for src_net, netns, link_netns, peer_netns, exp in cases:
            tgt_net = netns or src_net
            for typ in types:
                cmd = "link add"
                if netns:
                    cmd += f" netns {netns}"
                if link_netns:
                    cmd += f" link-netns {link_netns}"
                cmd += f" foo type {typ}"
                if peer_netns:
                    cmd += f" peer netns {peer_netns}"
                ip(cmd, ns=src_net)
                ksft_true(validate_link_netns(tgt_net, "foo", exp),
                          f"{typ} peer_netns validation failed")
                ip(f"link del foo", ns=tgt_net)


def main() -> None:
    ksft_run([test_event, test_link_net, test_peer_net])
    ksft_exit()


if __name__ == "__main__":
    main()