[PATCH net-next 5/6] net: bridge: fdb: add support for flush filtering based on ifindex

[Nikolay Aleksandrov <razor@blackwall.org>]

Add support for fdb flush filtering based on destination ifindex. The
ifindex must either match a port's device ifindex or the bridge's.

Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>
---
 include/uapi/linux/if_bridge.h | 1 +
 net/bridge/br_fdb.c            | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index 4638d7e39f2a..67ee12586844 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -819,6 +819,7 @@ enum {
 	FDB_FLUSH_NDM_STATE_MASK,
 	FDB_FLUSH_NDM_FLAGS,
 	FDB_FLUSH_NDM_FLAGS_MASK,
+	FDB_FLUSH_PORT_IFINDEX,
 	__FDB_FLUSH_MAX
 };
 #define FDB_FLUSH_MAX (__FDB_FLUSH_MAX - 1)
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 340a2ace1d5e..53208adf7474 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -628,6 +628,7 @@ static const struct nla_policy br_fdb_flush_policy[FDB_FLUSH_MAX + 1] = {
 	[FDB_FLUSH_NDM_FLAGS]	= { .type = NLA_U16 },
 	[FDB_FLUSH_NDM_STATE_MASK]	= { .type = NLA_U16 },
 	[FDB_FLUSH_NDM_FLAGS_MASK]	= { .type = NLA_U16 },
+	[FDB_FLUSH_PORT_IFINDEX]	= { .type = NLA_S32 },
 };
 
 int br_fdb_flush_nlattr(struct net_bridge *br, struct nlattr *fdb_flush_attr,
@@ -664,6 +665,12 @@ int br_fdb_flush_nlattr(struct net_bridge *br, struct nlattr *fdb_flush_attr,
 		ndm_flags_mask = nla_get_u16(fdb_flush_tb[FDB_FLUSH_NDM_FLAGS_MASK]);
 		desc.flags_mask |= __ndm_flags_to_fdb_flags(ndm_flags_mask);
 	}
+	if (fdb_flush_tb[FDB_FLUSH_PORT_IFINDEX]) {
+		int port_ifidx;
+
+		port_ifidx = nla_get_u32(fdb_flush_tb[FDB_FLUSH_PORT_IFINDEX]);
+		desc.port_ifindex = port_ifidx;
+	}
 
 	br_debug(br, "flushing port ifindex: %d vlan id: %u flags: 0x%lx flags mask: 0x%lx\n",
 		 desc.port_ifindex, desc.vlan_id, desc.flags, desc.flags_mask);
-- 
2.35.1