Commit 85cb3711 authored by Xiao Liang's avatar Xiao Liang Committed by Jakub Kicinski
Browse files

selftests: net: Add test cases for link and peer netns 



- Add test for creating link in another netns when a link of the same
   name and ifindex exists in current netns.
 - Add test to verify that link is created in target netns directly -
   no link new/del events should be generated in link netns or current
   netns.
 - Add test cases to verify that link-netns is set as expected for
   various drivers and combination of namespace-related parameters.

Signed-off-by: default avatarXiao Liang <shaw.leon@gmail.com>
Link: https://patch.msgid.link/20250219125039.18024-14-shaw.leon@gmail.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 03032941

tools/testing/selftests/net/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ TEST_PROGS += cmsg_so_priority.sh 
TEST_PROGS += test_so_rcv.sh

TEST_PROGS += cmsg_time.sh cmsg_ipv6.sh

TEST_PROGS += netns-name.sh

TEST_PROGS += link_netns.py

TEST_PROGS += nl_netdev.py

TEST_PROGS += rtnetlink.py

TEST_PROGS += srv6_end_dt46_l3vpn_test.sh

tools/testing/selftests/net/config

+5 −0
Original line number Diff line number Diff line
@@ -107,3 +107,8 @@ CONFIG_XFRM_INTERFACE=m 
CONFIG_XFRM_USER=m

CONFIG_IP_NF_MATCH_RPFILTER=m

CONFIG_IP6_NF_MATCH_RPFILTER=m

CONFIG_IPVLAN=m

CONFIG_CAN=m

CONFIG_CAN_DEV=m

CONFIG_CAN_VXCAN=m

CONFIG_NETKIT=y

tools/testing/selftests/net/link_netns.py

0 → 100755
+141 −0
Original line number Diff line number Diff line 
#!/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()

tools/testing/selftests/net/netns-name.sh

+10 −0
Original line number Diff line number Diff line
@@ -78,6 +78,16 @@ ip -netns $NS link show dev $ALT_NAME 2> /dev/null && 
    fail "Can still find alt-name after move"

ip -netns $test_ns link del $DEV || fail



#

# Test no conflict of the same name/ifindex in different netns

#

ip -netns $NS link add name $DEV index 100 type dummy || fail

ip -netns $NS link add netns $test_ns name $DEV index 100 type dummy ||

    fail "Can create in netns without moving"

ip -netns $test_ns link show dev $DEV >> /dev/null || fail "Device not found"

ip -netns $NS link del $DEV || fail

ip -netns $test_ns link del $DEV || fail



echo -ne "$(basename $0) \t\t\t\t"

if [ $RET_CODE -eq 0 ]; then

    echo "[  OK  ]"