[PATCH net-next v4 06/14] net: bridge: mcast: track active state, IPv6 address availability
From: Linus Lüssing <hidden>
Date: 2026-03-07 04:46:14
Also in:
bridge, linux-kselftest, lkml
Subsystem:
ethernet bridge, networking [general], the rest · Maintainers:
Nikolay Aleksandrov, Ido Schimmel, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
If we are the only potential MLD querier but don't have an IPv6 link-local address configured on our bridge interface then we can't create a valid MLD query and in turn can't reliably receive MLD reports and can't build a complete MDB. Hence disable the new multicast active state variable then. Or reenable it if an IPv6 link-local address became available. No functional change for the fast/data path yet. Signed-off-by: Linus Lüssing <redacted> Reviewed-by: Ido Schimmel <idosch@nvidia.com> --- net/bridge/br_multicast.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 64aac9c415e2..2eebfb7c5ff9 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c@@ -1125,6 +1125,8 @@ static void br_multicast_notify_active(struct net_bridge_mcast *brmctx, * The multicast active state is set, per protocol family, if: * * - an IGMP/MLD querier is present + * - for own IPv6 MLD querier: an IPv6 link-local address is configured on the + * bridge * * And is unset otherwise. *
@@ -1223,10 +1225,12 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge_mcast *brm &ip6h->daddr, 0, &ip6h->saddr)) { kfree_skb(skb); br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, false); + br_multicast_update_active(brmctx); return NULL; } br_opt_toggle(brmctx->br, BROPT_HAS_IPV6_ADDR, true); + br_multicast_update_active(brmctx); ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); hopopt = (u8 *)(ip6h + 1);
--
2.53.0