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net: ipv6: report multicast group user count

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The previous patch added IFA_MC_USERS and emits it for IPv4 multicast
groups. Add the same snapshot attribute to IPv6 RTM_GETMULTICAST
replies and entry-lifecycle notifications, carrying
ifmcaddr6::mca_users.

This makes the multicast rtnetlink ABI symmetric across IPv4 and IPv6
and gives userspace the same user count that /proc/net/igmp6 exposes.

Signed-off-by: Yuyang Huang <sigefriedhyy@gmail.com>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260630110207.37841-3-sigefriedhyy@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Yuyang Huang
2026-06-30 20:02:06 +09:00
committed by Paolo Abeni
parent 7cb8198761
commit e1d0f3f083
2 changed files with 2 additions and 0 deletions
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1
net/ipv6/addrconf.c
View File

@@ -5264,6 +5264,7 @@ int inet6_fill_ifmcaddr(struct sk_buff *skb,
put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
nla_put_u32(skb, IFA_MC_USERS, READ_ONCE(ifmca->mca_users)) < 0 ||
put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp),
INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
nlmsg_cancel(skb, nlh);

1
net/ipv6/mcast.c
View File

@@ -908,6 +908,7 @@ static void inet6_ifmcaddr_notify(struct net_device *dev,
skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
nla_total_size(sizeof(struct in6_addr)) +
nla_total_size(sizeof(u32)) +
nla_total_size(sizeof(struct ifa_cacheinfo)),
GFP_KERNEL);
if (!skb)