Use the new multicast ip{4,6}_active variables for the netlink output.
The result for the user should be the same. But this allows us to check
that from userspace tests, to ensure that ip{4,6}_active behave as intended
for the upcoming fast/data path changes.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
---
 net/bridge/br_netlink.c      | 10 ++--------
 net/bridge/br_private.h      |  2 +-
 net/bridge/br_vlan_options.c | 16 +++-------------
 3 files changed, 6 insertions(+), 22 deletions(-)

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 1b5ab1fb4558..e79fddf747f8 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -1650,8 +1650,6 @@ static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
 	u32 ageing_time = jiffies_to_clock_t(br->ageing_time);
 	u32 stp_enabled = br->stp_enabled;
 	u16 priority = (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1];
-	struct ethhdr eth6 = { .h_proto = htons(ETH_P_IPV6) };
-	struct ethhdr eth4 = { .h_proto = htons(ETH_P_IP) };
 	u8 vlan_enabled = br_vlan_enabled(br->dev);
 	struct br_boolopt_multi bm;
 	u64 clockval;
@@ -1724,9 +1722,7 @@ static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
 	    nla_put_u8(skb, IFLA_BR_MCAST_IGMP_VERSION,
 		       br->multicast_ctx.multicast_igmp_version) ||
 	    nla_put_u8(skb, IFLA_BR_MCAST_ACTIVE_V4,
-		       netif_running(brdev) && br_opt_get(br, BROPT_MULTICAST_ENABLED) &&
-		       !br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) &&
-		       br_multicast_querier_exists(&br->multicast_ctx, &eth4, NULL)) ||
+		       READ_ONCE(br->multicast_ctx.ip4_active)) ||
 	    br_multicast_dump_querier_state(skb, &br->multicast_ctx,
 					    IFLA_BR_MCAST_QUERIER_STATE))
 		return -EMSGSIZE;
@@ -1734,9 +1730,7 @@ static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
 	if (nla_put_u8(skb, IFLA_BR_MCAST_MLD_VERSION,
 		       br->multicast_ctx.multicast_mld_version) ||
 	    nla_put_u8(skb, IFLA_BR_MCAST_ACTIVE_V6,
-		       netif_running(brdev) && br_opt_get(br, BROPT_MULTICAST_ENABLED) &&
-		       !br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) &&
-		       br_multicast_querier_exists(&br->multicast_ctx, &eth6, NULL)))
+		       READ_ONCE(br->multicast_ctx.ip6_active)))
 		return -EMSGSIZE;
 #endif
 	clockval = jiffies_to_clock_t(br->multicast_ctx.multicast_last_member_interval);
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 4cc59abdb8e1..8150ecc2c919 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1899,7 +1899,7 @@ int br_vlan_rtm_process_global_options(struct net_device *dev,
 bool br_vlan_global_opts_can_enter_range(const struct net_bridge_vlan *v_curr,
 					 const struct net_bridge_vlan *r_end);
 bool br_vlan_global_opts_fill(struct sk_buff *skb, u16 vid, u16 vid_range,
-			      struct net_bridge_vlan *v_opts);
+			      const struct net_bridge_vlan *v_opts);
 
 /* vlan state manipulation helpers using *_ONCE to annotate lock-free access,
  * while br_vlan_set_state() may access data protected by multicast_lock.
diff --git a/net/bridge/br_vlan_options.c b/net/bridge/br_vlan_options.c
index 6425fa509b95..dcb214b5507d 100644
--- a/net/bridge/br_vlan_options.c
+++ b/net/bridge/br_vlan_options.c
@@ -347,10 +347,8 @@ bool br_vlan_global_opts_can_enter_range(const struct net_bridge_vlan *v_curr,
 }
 
 bool br_vlan_global_opts_fill(struct sk_buff *skb, u16 vid, u16 vid_range,
-			      struct net_bridge_vlan *v_opts)
+			      const struct net_bridge_vlan *v_opts)
 {
-	struct ethhdr eth6 = { .h_proto = htons(ETH_P_IPV6) };
-	struct ethhdr eth4 = { .h_proto = htons(ETH_P_IP) };
 	struct nlattr *nest2 __maybe_unused;
 	u64 clockval __maybe_unused;
 	struct nlattr *nest;
@@ -372,11 +370,7 @@ bool br_vlan_global_opts_fill(struct sk_buff *skb, u16 vid, u16 vid_range,
 	    nla_put_u8(skb, BRIDGE_VLANDB_GOPTS_MCAST_IGMP_VERSION,
 		       v_opts->br_mcast_ctx.multicast_igmp_version) ||
 	    nla_put_u8(skb, BRIDGE_VLANDB_GOPTS_MCAST_ACTIVE_V4,
-		       netif_running(v_opts->br->dev) &&
-		       br_opt_get(v_opts->br, BROPT_MULTICAST_ENABLED) &&
-		       br_opt_get(v_opts->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) &&
-		       !br_multicast_ctx_vlan_global_disabled(&v_opts->br_mcast_ctx) &&
-		       br_multicast_querier_exists(&v_opts->br_mcast_ctx, &eth4, NULL)) ||
+		       READ_ONCE(v_opts->br_mcast_ctx.ip4_active)) ||
 	    nla_put_u32(skb, BRIDGE_VLANDB_GOPTS_MCAST_LAST_MEMBER_CNT,
 			v_opts->br_mcast_ctx.multicast_last_member_count) ||
 	    nla_put_u32(skb, BRIDGE_VLANDB_GOPTS_MCAST_STARTUP_QUERY_CNT,
@@ -433,11 +427,7 @@ bool br_vlan_global_opts_fill(struct sk_buff *skb, u16 vid, u16 vid_range,
 	if (nla_put_u8(skb, BRIDGE_VLANDB_GOPTS_MCAST_MLD_VERSION,
 		       v_opts->br_mcast_ctx.multicast_mld_version) ||
 	    nla_put_u8(skb, BRIDGE_VLANDB_GOPTS_MCAST_ACTIVE_V6,
-		       netif_running(v_opts->br->dev) &&
-		       br_opt_get(v_opts->br, BROPT_MULTICAST_ENABLED) &&
-		       br_opt_get(v_opts->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) &&
-		       !br_multicast_ctx_vlan_global_disabled(&v_opts->br_mcast_ctx) &&
-		       br_multicast_querier_exists(&v_opts->br_mcast_ctx, &eth6, NULL)))
+		       READ_ONCE(v_opts->br_mcast_ctx.ip6_active)))
 		goto out_err;
 #endif
 #endif
-- 
2.51.0

On Fri, Feb 06, 2026 at 03:52:18AM +0100, Linus Lüssing wrote:
> Use the new multicast ip{4,6}_active variables for the netlink output.
> The result for the user should be the same. But this allows us to check
> that from userspace tests, to ensure that ip{4,6}_active behave as intended
> for the upcoming fast/data path changes.
> 
> Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>

Reviewed-by: Ido Schimmel <idosch@nvidia.com>