On Tue, Jun 30, 2026 at 08:02:05PM +0900, Yuyang Huang wrote: > RTM_GETMULTICAST has been part of the rtnetlink ABI for a long time > and already reports IPv4 multicast group membership through > IFA_MULTICAST and IFA_CACHEINFO. It does not report how many consumers > hold each membership, so userspace still has to parse /proc/net/igmp to > get the Users column. > > Add IFA_MC_USERS as a u32 attribute carrying ip_mc_list::users in > RTM_GETMULTICAST replies and entry-lifecycle notifications. > > This gives iproute2 enough information to migrate the IPv4 part of > "ip maddr show" from procfs parsing to rtnetlink. > > Signed-off-by: Yuyang Huang <[email protected]>
Reviewed-by: Ido Schimmel <[email protected]>
