[PATCH net-next v4 01/14] net: bridge: mcast: export ip{4,6}_active state to netlink

["Linus Lüssing" <linus.luessing@c0d3.blue>]

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>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
---
 include/uapi/linux/if_bridge.h |  2 ++
 include/uapi/linux/if_link.h   | 12 ++++++++++++
 net/bridge/br_netlink.c        | 20 +++++++++++++++++++-
 net/bridge/br_private.h        |  2 +-
 net/bridge/br_vlan_options.c   | 25 +++++++++++++++++++++++--
 net/core/rtnetlink.c           |  2 +-
 6 files changed, 58 insertions(+), 5 deletions(-)

diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index e52f8207ab27..910103b1ef03 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 83a96c56b8ca..66c59953d301 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -744,6 +744,16 @@ 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 IPv6 mcast active state, read only.
+ *
+ *   1 if an MLD querier is present, 0 otherwise.
  */
 enum {
 	IFLA_BR_UNSPEC,
@@ -796,6 +806,8 @@ 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 0264730938f4..7fff59c3bf76 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_REJECT },
 	[IFLA_BR_MCAST_MLD_VERSION] = { .type = NLA_U8 },
+	[IFLA_BR_MCAST_ACTIVE_V6] = { .type = NLA_REJECT },
 	[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)
@@ -1639,6 +1643,8 @@ 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);
@@ -1717,12 +1723,24 @@ 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,
+		       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)) ||
 	    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,
+		       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)))
 		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 9b55d38ea9ed..545be319b6cb 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1902,7 +1902,7 @@ 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,
-			      const struct net_bridge_vlan *v_opts);
+			      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 5514e1fc8d1f..06045d68a2d1 100644
--- a/net/bridge/br_vlan_options.c
+++ b/net/bridge/br_vlan_options.c
@@ -367,10 +367,13 @@ 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,
-			      const struct net_bridge_vlan *v_opts)
+			      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);
@@ -385,10 +388,17 @@ 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_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,
@@ -442,8 +452,15 @@ 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))
+		       v_opts->br_mcast_ctx.multicast_mld_version) ||
+	    nla_put_u8(skb, BRIDGE_VLANDB_GOPTS_MCAST_ACTIVE_V6, mcact))
 		goto out_err;
 #endif
 #endif
@@ -468,7 +485,9 @@ 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 */
@@ -650,9 +669,11 @@ 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_REJECT },
 	[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_REJECT },
 	[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 dad4b1054955..8febe7475f1f 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 {
-- 
2.53.0