[PATCH net-next v4 12/14] net: bridge: mcast: use combined active state in netlink

Linus Lüssing
2026-03-07T04:46:19Z

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>
---
net/bridge/br_netlink.c | 14 ++------------
net/bridge/br_private.h | 2 +-
net/bridge/br_vlan_options.c | 23 +++++------------------
3 files changed, 8 insertions(+), 31 deletions(-)

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 7fff59c3bf76..e79fddf747f8 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -1643,8 +1643,6 @@ static size_t br_get_size(const struct net_device *brdev)

static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
{
- struct ethhdr eth6 __maybe_unused = { .h_proto = htons(ETH_P_IPV6) };
- struct ethhdr eth4 __maybe_unused = { .h_proto = htons(ETH_P_IP) };
struct net_bridge *br = netdev_priv(brdev);
u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
u32 hello_time = jiffies_to_clock_t(br->hello_time);
@@ -1724,11 +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;
@@ -1736,11 +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 8d1c869eb522..2bdfc93499fc 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1909,7 +1909,7 @@ 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 06045d68a2d1..47ad35583a3f 100644
--- a/net/bridge/br_vlan_options.c
+++ b/net/bridge/br_vlan_options.c
@@ -367,13 +367,10 @@ 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 __maybe_unused = { .h_proto = htons(ETH_P_IPV6) };
- struct ethhdr eth4 __maybe_unused = { .h_proto = htons(ETH_P_IP) };
struct nlattr *nest2 __maybe_unused;
u64 clockval __maybe_unused;
- bool mcact __maybe_unused;
struct nlattr *nest;

nest = nla_nest_start(skb, BRIDGE_VLANDB_GLOBAL_OPTIONS);
@@ -388,17 +385,12 @@ bool br_vlan_global_opts_fill(struct sk_buff *skb, u16 vid, u16 vid_range,
goto out_err;

#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
- mcact = 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);
-
if (nla_put_u8(skb, BRIDGE_VLANDB_GOPTS_MCAST_SNOOPING,
!!(v_opts->priv_flags & BR_VLFLAG_GLOBAL_MCAST_ENABLED)) ||
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, mcact) ||
+ nla_put_u8(skb, BRIDGE_VLANDB_GOPTS_MCAST_ACTIVE_V4,
+ 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,
@@ -452,15 +444,10 @@ bool br_vlan_global_opts_fill(struct sk_buff *skb, u16 vid, u16 vid_range,
}

#if IS_ENABLED(CONFIG_IPV6)
- mcact = 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);
-
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, mcact))
+ nla_put_u8(skb, BRIDGE_VLANDB_GOPTS_MCAST_ACTIVE_V6,
+ READ_ONCE(v_opts->br_mcast_ctx.ip6_active)))
goto out_err;
#endif
#endif
--
2.53.0