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.
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| @@ -36,6 +36,7 @@ enum { · 35 unmodified lines | ||
| 36 | 36 | IFA_RT_PRIORITY, /* u32, priority/metric for prefix route */ |
| 37 | 37 | IFA_TARGET_NETNSID, |
| 38 | 38 | IFA_PROTO, /* u8, address protocol */ |
| 39 | + IFA_MC_USERS, /* u32, multicast group users */ | |
| 39 | 40 | __IFA_MAX, |
| 40 | 41 | }; |
| 41 | 42 | |