Subject: [PATCH v8 net-next 06/12] net: bridge: enable bridge to send and receive blackhole FDB entries

From: "Hans J. Schultz" <[email-masked]>
Date: Tue, 18 Oct 2022 18:56:13 +0200

Enable the bridge to receive blackhole FDB entries from drivers with
SWITCHDEV_FDB_ADD_TO_BRIDGE notifications and send them to drivers
with RTM_NEWNEIGH notifications.

Signed-off-by: Hans J. Schultz <[email-masked]>
---
 include/net/switchdev.h   |  1 +
 net/bridge/br.c           |  3 ++-
 net/bridge/br_fdb.c       | 19 ++++++++++++++++---
 net/bridge/br_private.h   |  3 ++-
 net/bridge/br_switchdev.c |  1 +
 5 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index ca0312b78294..39727902354e 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -249,6 +249,7 @@ struct switchdev_notifier_fdb_info {
 	u8 added_by_user:1,
 	   is_local:1,
 	   locked:1,
+	   blackhole:1,
 	   offloaded:1;
 };
 
diff --git a/net/bridge/br.c b/net/bridge/br.c
index e0e2df2fa278..85fc529b6a9f 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -166,7 +166,8 @@ static int br_switchdev_event(struct notifier_block *unused,
 	case SWITCHDEV_FDB_ADD_TO_BRIDGE:
 		fdb_info = ptr;
 		err = br_fdb_external_learn_add(br, p, fdb_info->addr, fdb_info->vid,
-						fdb_info->locked, false);
+						fdb_info->locked, fdb_info->is_local,
+						fdb_info->blackhole, false);
 		if (err) {
 			err = notifier_from_errno(err);
 			break;
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 8d207b1416f7..ef973d21d7bd 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -1145,7 +1145,7 @@ static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
 					   "FDB entry towards bridge must be permanent");
 			return -EINVAL;
 		}
-		err = br_fdb_external_learn_add(br, p, addr, vid, false, true);
+		err = br_fdb_external_learn_add(br, p, addr, vid, false, false, false, true);
 	} else {
 		spin_lock_bh(&br->hash_lock);
 		err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid, ext_flags, nfea_tb);
@@ -1401,7 +1401,7 @@ void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
 
 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 			      const unsigned char *addr, u16 vid, bool locked,
-			      bool swdev_notify)
+			      bool local, bool blackhole, bool swdev_notify)
 {
 	struct net_bridge_fdb_entry *fdb;
 	bool modified = false;
@@ -1418,12 +1418,15 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 		if (swdev_notify)
 			flags |= BIT(BR_FDB_ADDED_BY_USER);
 
-		if (!p)
+		if (!p || local)
 			flags |= BIT(BR_FDB_LOCAL);
 
 		if (locked)
 			flags |= BIT(BR_FDB_LOCKED);
 
+		if (blackhole)
+			flags |= BIT(BR_FDB_BLACKHOLE);
+
 		fdb = fdb_create(br, p, addr, vid, flags);
 		if (!fdb) {
 			err = -ENOMEM;
@@ -1447,11 +1450,21 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 			modified = true;
 		}
 
+		if (local != test_bit(BR_FDB_LOCAL, &fdb->flags)) {
+			change_bit(BR_FDB_LOCAL, &fdb->flags);
+			modified = true;
+		}
+
 		if (locked != test_bit(BR_FDB_LOCKED, &fdb->flags)) {
 			change_bit(BR_FDB_LOCKED, &fdb->flags);
 			modified = true;
 		}
 
+		if (blackhole != test_bit(BR_FDB_BLACKHOLE, &fdb->flags)) {
+			change_bit(BR_FDB_BLACKHOLE, &fdb->flags);
+			modified = true;
+		}
+
 		if (swdev_notify)
 			set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
 
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 3e9f4d1fbd60..4202c80e465e 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -812,7 +812,8 @@ int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 			      const unsigned char *addr, u16 vid,
-			      bool locked, bool swdev_notify);
+			      bool locked, bool local, bool blackhole,
+			      bool swdev_notify);
 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 			      const unsigned char *addr, u16 vid,
 			      bool swdev_notify);
diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index ccf1b4cffdd0..ce7b80c782ec 100644
--- a/net/bridge/br_switchdev.c
+++ b/net/bridge/br_switchdev.c
@@ -137,6 +137,7 @@ static void br_switchdev_fdb_populate(struct net_bridge *br,
 	item->offloaded = test_bit(BR_FDB_OFFLOADED, &fdb->flags);
 	item->is_local = test_bit(BR_FDB_LOCAL, &fdb->flags);
 	item->locked = test_bit(BR_FDB_LOCKED, &fdb->flags);
+	item->blackhole = test_bit(BR_FDB_BLACKHOLE, &fdb->flags);
 	item->info.dev = (!p || item->is_local) ? br->dev : p->dev;
 	item->info.ctx = ctx;
 }
-- 
2.34.1