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Miller" , Andrew Lunn , David Ahern , Donald Hunter , Eric Dumazet , Ido Schimmel , Jakub Kicinski , Paolo Abeni , Shuah Khan , Simon Horman , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH net-next 0/3] net: report multicast group user count Date: Tue, 30 Jun 2026 20:02:04 +0900 Message-ID: <20260630110207.37841-1-sigefriedhyy@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit RTM_GETMULTICAST reports IPv4 and IPv6 multicast group membership, but does not include the per-group user count. Userspace therefore still has to parse /proc/net/igmp and /proc/net/igmp6 to obtain the Users column. In particular, this prevents iproute2 from moving "ip maddr show" entirely from procfs to rtnetlink. Add IFA_MC_USERS to carry the user count in RTM_GETMULTICAST dumps and RTM_NEWMULTICAST / RTM_DELMULTICAST notifications for both address families. Update the rt-addr YNL specification and extend the rtnetlink selftest to verify that two joins increase the reported count by two. Yuyang Huang (3): net: ipv4: report multicast group user count net: ipv6: report multicast group user count selftests: net: check multicast group user count Documentation/netlink/specs/rt-addr.yaml | 4 + include/uapi/linux/if_addr.h | 1 + net/ipv4/igmp.c | 2 + net/ipv6/addrconf.c | 1 + net/ipv6/mcast.c | 1 + tools/testing/selftests/net/rtnetlink.py | 101 ++++++++++++++++++++--- 6 files changed, 99 insertions(+), 11 deletions(-) -- 2.43.0