netdev - [PATCH net-next v2 3/8] net: bridge: fdb: add ndo_fdb

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Date:   Mon, 11 Apr 2022 20:29:29 +0300
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     netdev@...r.kernel.org
Cc:     roopa@...dia.com, idosch@...sch.org, kuba@...nel.org,
        davem@...emloft.net, bridge@...ts.linux-foundation.org,
        Nikolay Aleksandrov <razor@...ckwall.org>
Subject: [PATCH net-next v2 3/8] net: bridge: fdb: add ndo_fdb_flush op

Add a minimal ndo_fdb_flush implementation which flushes all entries.
Support for more fine-grained filtering will be added in the following
patches.

Signed-off-by: Nikolay Aleksandrov <razor@...ckwall.org>
---
 net/bridge/br_device.c   |  1 +
 net/bridge/br_fdb.c      | 25 ++++++++++++++++++++++++-
 net/bridge/br_netlink.c  |  2 +-
 net/bridge/br_private.h  |  6 +++++-
 net/bridge/br_sysfs_br.c |  2 +-
 5 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 8d6bab244c4a..76ee2675457a 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -466,6 +466,7 @@ static const struct net_device_ops br_netdev_ops = {
 	.ndo_fdb_add		 = br_fdb_add,
 	.ndo_fdb_del		 = br_fdb_delete,
 	.ndo_fdb_dump		 = br_fdb_dump,
+	.ndo_fdb_flush		 = br_fdb_flush,
 	.ndo_fdb_get		 = br_fdb_get,
 	.ndo_bridge_getlink	 = br_getlink,
 	.ndo_bridge_setlink	 = br_setlink,
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 6ccda68bd473..64a549acdac8 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -559,7 +559,7 @@ void br_fdb_cleanup(struct work_struct *work)
 }
 
 /* Completely flush all dynamic entries in forwarding database.*/
-void br_fdb_flush(struct net_bridge *br)
+void __br_fdb_flush(struct net_bridge *br)
 {
 	struct net_bridge_fdb_entry *f;
 	struct hlist_node *tmp;
@@ -572,6 +572,29 @@ void br_fdb_flush(struct net_bridge *br)
 	spin_unlock_bh(&br->hash_lock);
 }
 
+int br_fdb_flush(struct ndmsg *ndm, struct nlattr *tb[],
+		 struct net_device *dev, u16 vid,
+		 struct netlink_ext_ack *extack)
+{
+	struct net_bridge *br;
+
+	if (netif_is_bridge_master(dev)) {
+		br = netdev_priv(dev);
+	} else {
+		struct net_bridge_port *p = br_port_get_rtnl(dev);
+
+		if (!p) {
+			NL_SET_ERR_MSG_MOD(extack, "Device is not a bridge port");
+			return -EINVAL;
+		}
+		br = p->br;
+	}
+
+	__br_fdb_flush(br);
+
+	return 0;
+}
+
 /* Flush all entries referring to a specific port.
  * if do_all is set also flush static entries
  * if vid is set delete all entries that match the vlan_id
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 200ad05b296f..c59c775730bb 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -1327,7 +1327,7 @@ static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
 	}
 
 	if (data[IFLA_BR_FDB_FLUSH])
-		br_fdb_flush(br);
+		__br_fdb_flush(br);
 
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 	if (data[IFLA_BR_MCAST_ROUTER]) {
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 6e62af2e07e9..23ef2982d1bc 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -759,7 +759,11 @@ int br_fdb_init(void);
 void br_fdb_fini(void);
 int br_fdb_hash_init(struct net_bridge *br);
 void br_fdb_hash_fini(struct net_bridge *br);
-void br_fdb_flush(struct net_bridge *br);
+void __br_fdb_flush(struct net_bridge *br);
+int br_fdb_flush(struct ndmsg *ndm, struct nlattr *tb[],
+		 struct net_device *dev, u16 vid,
+		 struct netlink_ext_ack *extack);
+
 void br_fdb_find_delete_local(struct net_bridge *br,
 			      const struct net_bridge_port *p,
 			      const unsigned char *addr, u16 vid);
diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c
index 3f7ca88c2aa3..7a2cf3aebc84 100644
--- a/net/bridge/br_sysfs_br.c
+++ b/net/bridge/br_sysfs_br.c
@@ -344,7 +344,7 @@ static DEVICE_ATTR_RW(group_addr);
 static int set_flush(struct net_bridge *br, unsigned long val,
 		     struct netlink_ext_ack *extack)
 {
-	br_fdb_flush(br);
+	__br_fdb_flush(br);
 	return 0;
 }
 
-- 
2.35.1