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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , David Ahern , netdev@vger.kernel.org, Donald Hunter , Shuah Khan , Nikolay Aleksandrov , Hangbin Liu , Daniel Borkmann , linux-kselftest@vger.kernel.org, " =?utf-8?q?Maciej_=C5=BBenczykowski?= " , Lorenzo Colitti This change introduces a new selftest case to verify the functionality of dumping IPv4 multicast addresses using the RTM_GETMULTICAST netlink message. The test utilizes the ynl library to interact with the netlink interface and validate that the kernel correctly reports the joined IPv4 multicast addresses. To run the test, execute the following command: $ vng -v --user root --cpus 16 -- \ make -C tools/testing/selftests TARGETS=net \ TEST_PROGS=rtnetlink.py TEST_GEN_PROGS="" run_tests Cc: Maciej Żenczykowski Cc: Lorenzo Colitti Signed-off-by: Yuyang Huang --- Documentation/netlink/specs/rt_link.yaml | 70 ++++++++++++++++++++++++ tools/testing/selftests/net/Makefile | 1 + tools/testing/selftests/net/rtnetlink.py | 30 ++++++++++ 3 files changed, 101 insertions(+) create mode 100755 tools/testing/selftests/net/rtnetlink.py diff --git a/Documentation/netlink/specs/rt_link.yaml b/Documentation/netlink/specs/rt_link.yaml index 0d492500c7e5..7dcd5fddac9d 100644 --- a/Documentation/netlink/specs/rt_link.yaml +++ b/Documentation/netlink/specs/rt_link.yaml @@ -92,6 +92,41 @@ definitions: - name: ifi-change type: u32 + - + name: ifaddrmsg + type: struct + members: + - + name: ifa-family + type: u8 + - + name: ifa-prefixlen + type: u8 + - + name: ifa-flags + type: u8 + - + name: ifa-scope + type: u8 + - + name: ifa-index + type: u32 + - + name: ifacacheinfo + type: struct + members: + - + name: ifa-prefered + type: u32 + - + name: ifa-valid + type: u32 + - + name: cstamp + type: u32 + - + name: tstamp + type: u32 - name: ifla-bridge-id type: struct @@ -2253,6 +2288,18 @@ attribute-sets: - name: tailroom type: u16 + - + name: ifmcaddr-attrs + attributes: + - + name: addr + type: binary + value: 7 + - + name: cacheinfo + type: binary + struct: ifacacheinfo + value: 6 sub-messages: - @@ -2493,6 +2540,29 @@ operations: reply: value: 92 attributes: *link-stats-attrs + - + name: getmaddrs + doc: Get / dump IPv4/IPv6 multicast addresses. + attribute-set: ifmcaddr-attrs + fixed-header: ifaddrmsg + do: + request: + value: 58 + attributes: + - ifa-family + - ifa-index + reply: + value: 58 + attributes: &mcaddr-attrs + - addr + - cacheinfo + dump: + request: + value: 58 + - ifa-family + reply: + value: 58 + attributes: *mcaddr-attrs mcast-groups: list: diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index 73ee88d6b043..e2f03211f9b3 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -36,6 +36,7 @@ TEST_PROGS += cmsg_so_priority.sh TEST_PROGS += cmsg_time.sh cmsg_ipv6.sh TEST_PROGS += netns-name.sh TEST_PROGS += nl_netdev.py +TEST_PROGS += rtnetlink.py TEST_PROGS += srv6_end_dt46_l3vpn_test.sh TEST_PROGS += srv6_end_dt4_l3vpn_test.sh TEST_PROGS += srv6_end_dt6_l3vpn_test.sh diff --git a/tools/testing/selftests/net/rtnetlink.py b/tools/testing/selftests/net/rtnetlink.py new file mode 100755 index 000000000000..9b9dfbe4dd7b --- /dev/null +++ b/tools/testing/selftests/net/rtnetlink.py @@ -0,0 +1,30 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0 + +from lib.py import ksft_exit, ksft_run, ksft_ge, RtnlFamily +import socket + +IPV4_ALL_HOSTS_MULTICAST = b'\xe0\x00\x00\x01' + +def dump_mcaddr_check(rtnl: RtnlFamily) -> None: + """ + Verify that at least one interface has the IPv4 all-hosts multicast address. + At least the loopback interface should have this address. + """ + + addresses = rtnl.getmaddrs({"ifa-family": socket.AF_INET}, dump=True) + + all_host_multicasts = [ + addr for addr in addresses if addr['addr'] == IPV4_ALL_HOSTS_MULTICAST + ] + + ksft_ge(len(all_host_multicasts), 1, + "No interface found with the IPv4 all-hosts multicast address") + +def main() -> None: + rtnl = RtnlFamily() + ksft_run([dump_mcaddr_check], args=(rtnl, )) + ksft_exit() + +if __name__ == "__main__": + main()