netdev - [PATCHv2 net 2/2] team: reset team's flags when down link is P2P device

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Message-Id: <20230714081340.2064472-3-liuhangbin@gmail.com>
Date: Fri, 14 Jul 2023 16:13:40 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: netdev@...r.kernel.org
Cc: Jay Vosburgh <j.vosburgh@...il.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Liang Li <liali@...hat.com>,
	Jiri Pirko <jiri@...dia.com>,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCHv2 net 2/2] team: reset team's flags when down link is P2P device

When adding a point to point downlink to team device, we neglected to reset
the team's flags, which were still using flags like BROADCAST and
MULTICAST. Consequently, this would initiate ARP/DAD for P2P downlink
interfaces, such as when adding a GRE device to team device.

Fix this by remove multicast/broadcast flags and add p2p and noarp flags.

Reported-by: Liang Li <liali@...hat.com>
Links: https://bugzilla.redhat.com/show_bug.cgi?id=2221438
Fixes: 1d76efe1577b ("team: add support for non-ethernet devices")
Reviewed-by: Jiri Pirko <jiri@...dia.com>
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 drivers/net/team/team.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 555b0b1e9a78..9104e373c8cb 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -2135,6 +2135,11 @@ static void team_setup_by_port(struct net_device *dev,
 	dev->mtu = port_dev->mtu;
 	memcpy(dev->broadcast, port_dev->broadcast, port_dev->addr_len);
 	eth_hw_addr_inherit(dev, port_dev);
+
+	if (port_dev->flags & IFF_POINTOPOINT) {
+		dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);
+		dev->flags |= (IFF_POINTOPOINT | IFF_NOARP);
+	}
 }
 
 static int team_dev_type_check_change(struct net_device *dev,
-- 
2.38.1