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Miller" , David Ahern , Donald Hunter , Eric Dumazet , Ido Schimmel , Jacob Keller , Jakub Kicinski , Kuniyuki Iwashima , Nicolas Dichtel , Nikolaos Gkarlis , Paolo Abeni , Sabrina Dubroca , Shuah Khan , Simon Horman , Stanislav Fomichev , Willem de Bruijn , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH net-next v8 5/5] selftests: net: test AF_PACKET multicast dumps Date: Sun, 27 Sep 2026 09:24:27 +0900 Message-ID: <20260927002427.4519-6-sigefriedhyy@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260927002427.4519-1-sigefriedhyy@gmail.com> References: <20260927002427.4519-1-sigefriedhyy@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Dump the link-layer multicast addresses of a dummy device and verify that ifa_index restricts the dump to that device, that the all-hosts address joined on link up is listed without IFA_F_GLOBAL, that an address added with SIOCADDMULTI is listed with IFA_F_GLOBAL and IFA_MC_USERS, and that IFA_TARGET_NETNSID dumps another netns. Signed-off-by: Yuyang Huang Reviewed-by: Nicolas Dichtel --- tools/testing/selftests/net/rtnetlink.py | 73 +++++++++++++++++++++++- 1 file changed, 71 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/net/rtnetlink.py b/tools/testing/selftests/net/rtnetlink.py index dc8c77db4897..5534ade056a5 100755 --- a/tools/testing/selftests/net/rtnetlink.py +++ b/tools/testing/selftests/net/rtnetlink.py @@ -5,13 +5,18 @@ import socket import struct import time from lib.py import bkg, ip, ksft_exit, ksft_run, ksft_eq, ksft_ge, ksft_true, KsftSkipEx -from lib.py import ksft_not_in, ksft_not_none +from lib.py import ksft_in, ksft_not_in, ksft_not_none from lib.py import CmdExitFailure, NetNS, NetNSEnter, RtnlAddrFamily, RtnlRouteFamily from lib.py import defer IPV4_ALL_HOSTS_MULTICAST = b'\xe0\x00\x00\x01' IPV4_TEST_MULTICAST = b'\xef\x01\x01\x01' IPV6_TEST_MULTICAST = bytes.fromhex('ff020000000000000000000000000123') +ETH_ALL_HOSTS_MULTICAST = bytes.fromhex('01005e000001') +ETH_TEST_MULTICAST_STR = '01:00:5e:01:01:01' +ETH_TEST_MULTICAST = bytes.fromhex(ETH_TEST_MULTICAST_STR.replace(':', '')) +ETH_PEER_MULTICAST_STR = '01:00:5e:02:02:02' +ETH_PEER_MULTICAST = bytes.fromhex(ETH_PEER_MULTICAST_STR.replace(':', '')) def _users_for(rtnl: RtnlAddrFamily, family: int, grp: bytes, ifindex: int): @@ -105,6 +110,69 @@ def dump_mcaddr6_check() -> None: s2.close() +def dump_mcaddr_l2_check() -> None: + """ + Verify link-layer multicast addresses in an AF_PACKET RTM_GETMULTICAST + dump: the ifa-index filter, mc-users, the global flag and + target-netnsid. + """ + + with NetNS() as ns, NetNSEnter(str(ns)): + for ifname in ("dummy1", "dummy2"): + ip(f"link add name {ifname} type dummy") + ip(f"link set {ifname} up") + dev_idx = socket.if_nametoindex("dummy1") + ip(f"maddr add {ETH_TEST_MULTICAST_STR} dev dummy1") + + rtnl = RtnlAddrFamily() + defer(rtnl.close) + addresses = rtnl.getmulticast( + {"ifa-family": socket.AF_PACKET, "ifa-index": dev_idx}, + dump=True) + + # dummy2 has entries as well, only dummy1 may be listed + ksft_eq({addr['ifa-index'] for addr in addresses}, {dev_idx}, + "AF_PACKET multicast dump ignored ifa-index filter") + + entries = {addr['multicast']: addr for addr in addresses} + + # Bringing an Ethernet device up joins 224.0.0.1, which maps + # to 01:00:5e:00:00:01 in the device multicast list. + all_hosts = entries.get(ETH_ALL_HOSTS_MULTICAST) + ksft_not_none(all_hosts, + "dummy1 does not have the all-hosts link-layer address") + if all_hosts is not None: + ksft_not_in('global', all_hosts['flags'], + "protocol entry is global") + + static = entries.get(ETH_TEST_MULTICAST) + ksft_not_none(static, "dummy1 does not have the SIOCADDMULTI address") + if static is not None: + ksft_eq(static['mc-users'], 1, + "unexpected mc-users for the SIOCADDMULTI address") + ksft_in('global', static['flags'], + "SIOCADDMULTI entry is not global") + + # target-netnsid dumps another netns, ifa-index is relative to it + with NetNS() as peer: + ip(f"netns set {peer} 5") + ip("link add name dummy3 type dummy", ns=peer) + ip("link set dummy3 up", ns=peer) + ip(f"maddr add {ETH_PEER_MULTICAST_STR} dev dummy3", ns=peer) + peer_idx = ip("link show dummy3", json=True, ns=peer)[0]['ifindex'] + + addresses = rtnl.getmulticast( + {"ifa-family": socket.AF_PACKET, "target-netnsid": 5, + "ifa-index": peer_idx}, dump=True) + ksft_eq({(addr['ifa-index'], addr['target-netnsid']) + for addr in addresses}, {(peer_idx, 5)}, + "target-netnsid did not dump the peer netns") + # dummy1 in this netns can have the same ifindex as dummy3 + ksft_in(ETH_PEER_MULTICAST, + {addr['multicast'] for addr in addresses}, + "target-netnsid did not dump the peer device") + + def ipv4_devconf_notify() -> None: """ Configure an interface and set ipv4-devconf values through netlink @@ -424,7 +492,8 @@ def ipv6_verify_inter_scope_addr_order() -> None: def main() -> None: - ksft_run([dump_mcaddr_check, dump_mcaddr6_check, ipv4_devconf_notify, + ksft_run([dump_mcaddr_check, dump_mcaddr6_check, dump_mcaddr_l2_check, + ipv4_devconf_notify, ipv6_route_del_reason_expired, ipv6_route_del_reason_ra_withdrawn, ipv6_route_del_reason_absent, -- 2.43.0