diff mbox series

[net-next,2/5] net: bridge: mcast: export ip{4,6}_active state to netlink

Message ID 20250522195952.29265-3-linus.luessing@c0d3.blue
State New
Headers show
Series net: bridge: propagate safe mcast snooping to switchdev + DSA | expand

Commit Message

Linus Lüssing May 22, 2025, 7:17 p.m. UTC 
Export the new ip{4,6}_active variables to netlink, to be able to
check from userspace that they are updated as intended.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
---
 include/uapi/linux/if_bridge.h |  2 ++
 include/uapi/linux/if_link.h   | 12 ++++++++++++
 net/bridge/br_netlink.c        | 10 +++++++++-
 net/bridge/br_vlan_options.c   | 10 +++++++++-
 net/core/rtnetlink.c           |  2 +-
 5 files changed, 33 insertions(+), 3 deletions(-)

Comments

Ido Schimmel May 25, 2025, 5:20 p.m. UTC | #1 
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On Thu, May 22, 2025 at 09:17:04PM +0200, Linus Lüssing wrote:
> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
> index 318386cc5b0d..41f6c461ab32 100644
> --- a/include/uapi/linux/if_link.h
> +++ b/include/uapi/linux/if_link.h
> @@ -742,6 +742,16 @@ enum in6_addr_gen_mode {
>   * @IFLA_BR_FDB_MAX_LEARNED
>   *   Set the number of max dynamically learned FDB entries for the current
>   *   bridge.
> + *
> + * @IFLA_BR_MCAST_ACTIVE_V4
> + *   Bridge IPv4 mcast active state, read only.
> + *
> + *   1 if an IGMP querier is present, 0 otherwise.
> + *
> + * @IFLA_BR_MCAST_ACTIVE_V6
> + *   Bridge IPv4 mcast active state, read only.
> + *
> + *   1 if an MLD querier is present, 0 otherwise.
>   */

[...]

> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 6e337937d0d7..7829d2842851 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -1264,7 +1264,9 @@ static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
>  	[IFLA_BR_VLAN_STATS_ENABLED] = { .type = NLA_U8 },
>  	[IFLA_BR_MCAST_STATS_ENABLED] = { .type = NLA_U8 },
>  	[IFLA_BR_MCAST_IGMP_VERSION] = { .type = NLA_U8 },
> +	[IFLA_BR_MCAST_ACTIVE_V4] = { .type = NLA_U8 },
>  	[IFLA_BR_MCAST_MLD_VERSION] = { .type = NLA_U8 },
> +	[IFLA_BR_MCAST_ACTIVE_V6] = { .type = NLA_U8 },

The new attributes should be set to 'NLA_REJECT' if they are meant to be
read only. They can also be removed from the policy, but being explicit
and using 'NLA_REJECT' is better IMO.
diff mbox series

Patch

diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index a5b743a2f775..fe26646c38c8 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -584,6 +584,8 @@  enum {
 	BRIDGE_VLANDB_GOPTS_MCAST_ROUTER_PORTS,
 	BRIDGE_VLANDB_GOPTS_MCAST_QUERIER_STATE,
 	BRIDGE_VLANDB_GOPTS_MSTI,
+	BRIDGE_VLANDB_GOPTS_MCAST_ACTIVE_V4,
+	BRIDGE_VLANDB_GOPTS_MCAST_ACTIVE_V6,
 	__BRIDGE_VLANDB_GOPTS_MAX
 };
 #define BRIDGE_VLANDB_GOPTS_MAX (__BRIDGE_VLANDB_GOPTS_MAX - 1)
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 318386cc5b0d..41f6c461ab32 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -742,6 +742,16 @@  enum in6_addr_gen_mode {
  * @IFLA_BR_FDB_MAX_LEARNED
  *   Set the number of max dynamically learned FDB entries for the current
  *   bridge.
+ *
+ * @IFLA_BR_MCAST_ACTIVE_V4
+ *   Bridge IPv4 mcast active state, read only.
+ *
+ *   1 if an IGMP querier is present, 0 otherwise.
+ *
+ * @IFLA_BR_MCAST_ACTIVE_V6
+ *   Bridge IPv4 mcast active state, read only.
+ *
+ *   1 if an MLD querier is present, 0 otherwise.
  */
 enum {
 	IFLA_BR_UNSPEC,
@@ -794,6 +804,8 @@  enum {
 	IFLA_BR_MCAST_QUERIER_STATE,
 	IFLA_BR_FDB_N_LEARNED,
 	IFLA_BR_FDB_MAX_LEARNED,
+	IFLA_BR_MCAST_ACTIVE_V4,
+	IFLA_BR_MCAST_ACTIVE_V6,
 	__IFLA_BR_MAX,
 };
 
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 6e337937d0d7..7829d2842851 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -1264,7 +1264,9 @@  static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
 	[IFLA_BR_VLAN_STATS_ENABLED] = { .type = NLA_U8 },
 	[IFLA_BR_MCAST_STATS_ENABLED] = { .type = NLA_U8 },
 	[IFLA_BR_MCAST_IGMP_VERSION] = { .type = NLA_U8 },
+	[IFLA_BR_MCAST_ACTIVE_V4] = { .type = NLA_U8 },
 	[IFLA_BR_MCAST_MLD_VERSION] = { .type = NLA_U8 },
+	[IFLA_BR_MCAST_ACTIVE_V6] = { .type = NLA_U8 },
 	[IFLA_BR_VLAN_STATS_PER_PORT] = { .type = NLA_U8 },
 	[IFLA_BR_MULTI_BOOLOPT] =
 		NLA_POLICY_EXACT_LEN(sizeof(struct br_boolopt_multi)),
@@ -1625,7 +1627,9 @@  static size_t br_get_size(const struct net_device *brdev)
 	       nla_total_size_64bit(sizeof(u64)) + /* IFLA_BR_MCAST_QUERY_RESPONSE_INTVL */
 	       nla_total_size_64bit(sizeof(u64)) + /* IFLA_BR_MCAST_STARTUP_QUERY_INTVL */
 	       nla_total_size(sizeof(u8)) +	/* IFLA_BR_MCAST_IGMP_VERSION */
+	       nla_total_size(sizeof(u8)) +     /* IFLA_BR_MCAST_ACTIVE_V4 */
 	       nla_total_size(sizeof(u8)) +	/* IFLA_BR_MCAST_MLD_VERSION */
+	       nla_total_size(sizeof(u8)) +     /* IFLA_BR_MCAST_ACTIVE_V6 */
 	       br_multicast_querier_state_size() + /* IFLA_BR_MCAST_QUERIER_STATE */
 #endif
 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
@@ -1717,12 +1721,16 @@  static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
 			br->multicast_ctx.multicast_startup_query_count) ||
 	    nla_put_u8(skb, IFLA_BR_MCAST_IGMP_VERSION,
 		       br->multicast_ctx.multicast_igmp_version) ||
+	    nla_put_u8(skb, IFLA_BR_MCAST_ACTIVE_V4,
+		       br->multicast_ctx.ip4_active) ||
 	    br_multicast_dump_querier_state(skb, &br->multicast_ctx,
 					    IFLA_BR_MCAST_QUERIER_STATE))
 		return -EMSGSIZE;
 #if IS_ENABLED(CONFIG_IPV6)
 	if (nla_put_u8(skb, IFLA_BR_MCAST_MLD_VERSION,
-		       br->multicast_ctx.multicast_mld_version))
+		       br->multicast_ctx.multicast_mld_version) ||
+	    nla_put_u8(skb, IFLA_BR_MCAST_ACTIVE_V6,
+		       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_vlan_options.c b/net/bridge/br_vlan_options.c
index 8fa89b04ee94..a97657be51a7 100644
--- a/net/bridge/br_vlan_options.c
+++ b/net/bridge/br_vlan_options.c
@@ -369,6 +369,8 @@  bool br_vlan_global_opts_fill(struct sk_buff *skb, u16 vid, u16 vid_range,
 		       !!(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,
+		       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,
@@ -423,7 +425,9 @@  bool br_vlan_global_opts_fill(struct sk_buff *skb, u16 vid, u16 vid_range,
 
 #if IS_ENABLED(CONFIG_IPV6)
 	if (nla_put_u8(skb, BRIDGE_VLANDB_GOPTS_MCAST_MLD_VERSION,
-		       v_opts->br_mcast_ctx.multicast_mld_version))
+		       v_opts->br_mcast_ctx.multicast_mld_version) ||
+	    nla_put_u8(skb, BRIDGE_VLANDB_GOPTS_MCAST_ACTIVE_V6,
+		       v_opts->br_mcast_ctx.ip4_active))
 		goto out_err;
 #endif
 #endif
@@ -448,7 +452,9 @@  static size_t rtnl_vlan_global_opts_nlmsg_size(const struct net_bridge_vlan *v)
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 		+ nla_total_size(sizeof(u8)) /* BRIDGE_VLANDB_GOPTS_MCAST_SNOOPING */
 		+ nla_total_size(sizeof(u8)) /* BRIDGE_VLANDB_GOPTS_MCAST_IGMP_VERSION */
+		+ nla_total_size(sizeof(u8)) /* BRIDGE_VLANDB_GOPTS_MCAST_ACTIVE_V4 */
 		+ nla_total_size(sizeof(u8)) /* BRIDGE_VLANDB_GOPTS_MCAST_MLD_VERSION */
+		+ nla_total_size(sizeof(u8)) /* BRIDGE_VLANDB_GOPTS_MCAST_ACTIVE_V6 */
 		+ nla_total_size(sizeof(u32)) /* BRIDGE_VLANDB_GOPTS_MCAST_LAST_MEMBER_CNT */
 		+ nla_total_size(sizeof(u32)) /* BRIDGE_VLANDB_GOPTS_MCAST_STARTUP_QUERY_CNT */
 		+ nla_total_size(sizeof(u64)) /* BRIDGE_VLANDB_GOPTS_MCAST_LAST_MEMBER_INTVL */
@@ -630,9 +636,11 @@  static const struct nla_policy br_vlan_db_gpol[BRIDGE_VLANDB_GOPTS_MAX + 1] = {
 	[BRIDGE_VLANDB_GOPTS_RANGE]	= { .type = NLA_U16 },
 	[BRIDGE_VLANDB_GOPTS_MCAST_SNOOPING]	= { .type = NLA_U8 },
 	[BRIDGE_VLANDB_GOPTS_MCAST_MLD_VERSION]	= { .type = NLA_U8 },
+	[BRIDGE_VLANDB_GOPTS_MCAST_ACTIVE_V6]	= { .type = NLA_U8 },
 	[BRIDGE_VLANDB_GOPTS_MCAST_QUERY_INTVL]	= { .type = NLA_U64 },
 	[BRIDGE_VLANDB_GOPTS_MCAST_QUERIER]	= { .type = NLA_U8 },
 	[BRIDGE_VLANDB_GOPTS_MCAST_IGMP_VERSION]	= { .type = NLA_U8 },
+	[BRIDGE_VLANDB_GOPTS_MCAST_ACTIVE_V4]	= { .type = NLA_U8 },
 	[BRIDGE_VLANDB_GOPTS_MCAST_LAST_MEMBER_CNT]	= { .type = NLA_U32 },
 	[BRIDGE_VLANDB_GOPTS_MCAST_STARTUP_QUERY_CNT]	= { .type = NLA_U32 },
 	[BRIDGE_VLANDB_GOPTS_MCAST_LAST_MEMBER_INTVL]	= { .type = NLA_U64 },
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index c5a7f41982a5..dee32084be59 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -62,7 +62,7 @@ 
 
 #include "dev.h"
 
-#define RTNL_MAX_TYPE		50
+#define RTNL_MAX_TYPE		52
 #define RTNL_SLAVE_MAX_TYPE	44
 
 struct rtnl_link {