linux-kernel - [PATCH net v2] net: bridge: mst: Check vlan state for egress decision

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Message-ID: <20240711045926.756958-1-elliot.ayrey@alliedtelesis.co.nz>
Date: Thu, 11 Jul 2024 16:59:25 +1200
From: Elliot Ayrey <elliot.ayrey@...iedtelesis.co.nz>
To: davem@...emloft.net
Cc: Elliot Ayrey <elliot.ayrey@...iedtelesis.co.nz>,
	Roopa Prabhu <roopa@...dia.com>,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Tobias Waldekranz <tobias@...dekranz.com>,
	bridge@...ts.linux.dev,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net v2] net: bridge: mst: Check vlan state for egress decision

If a port is blocking in the common instance but forwarding in an MST
instance, traffic egressing the bridge will be dropped because the
state of the common instance is overriding that of the MST instance.

Fix this by skipping the port state check in MST mode to allow
checking the vlan state via br_allowed_egress(). This is similar to
what happens in br_handle_frame_finish() when checking ingress
traffic, which was introduced in the change below.

Fixes: ec7328b59176 ("net: bridge: mst: Multiple Spanning Tree (MST) mode")
Signed-off-by: Elliot Ayrey <elliot.ayrey@...iedtelesis.co.nz>
---

v2:
  - Restructure the MST mode check to make it read better
v1: https://lore.kernel.org/all/20240705030041.1248472-1-elliot.ayrey@alliedtelesis.co.nz/

 net/bridge/br_forward.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index d97064d460dc..e63d6f6308f8 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -25,8 +25,8 @@ static inline int should_deliver(const struct net_bridge_port *p,
 
 	vg = nbp_vlan_group_rcu(p);
 	return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) &&
-		p->state == BR_STATE_FORWARDING && br_allowed_egress(vg, skb) &&
-		nbp_switchdev_allowed_egress(p, skb) &&
+		(br_mst_is_enabled(p->br) || state == BR_STATE_FORWARDING) &&
+		br_allowed_egress(vg, skb) && nbp_switchdev_allowed_egress(p, skb) &&
 		!br_skb_isolated(p, skb);
 }
 
-- 
2.45.2