netdev - Re: [PATCHv2 1/2] bonding: don't set oif to bond dev when getting NS target destination

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Message-ID: <2850156.1757371893@famine>
Date: Mon, 08 Sep 2025 15:51:33 -0700
From: Jay Vosburgh <jv@...sburgh.net>
To: Hangbin Liu <liuhangbin@...il.com>
cc: netdev@...r.kernel.org, Andrew Lunn <andrew+netdev@...n.ch>,
    "David S. Miller" <davem@...emloft.net>,
    Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
    Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
    Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
    David Wilder <wilder@...ibm.com>
Subject: Re: [PATCHv2 1/2] bonding: don't set oif to bond dev when getting NS
 target destination

Hangbin Liu <liuhangbin@...il.com> wrote:

>Unlike IPv4, IPv6 routing strictly requires the source address to be valid
>on the outgoing interface. If the NS target is set to a remote VLAN interface,
>and the source address is also configured on a VLAN over a bond interface,
>setting the oif to the bond device will fail to retrieve the correct
>destination route.
>
>Fix this by not setting the oif to the bond device when retrieving the NS
>target destination. This allows the correct destination device (the VLAN
>interface) to be determined, so that bond_verify_device_path can return the
>proper VLAN tags for sending NS messages.
>
>Reported-by: David Wilder <wilder@...ibm.com>
>Closes: https://lore.kernel.org/netdev/aGOKggdfjv0cApTO@fedora/
>Suggested-by: Jay Vosburgh <jv@...sburgh.net>
>Fixes: 4e24be018eb9 ("bonding: add new parameter ns_targets")
>Signed-off-by: Hangbin Liu <liuhangbin@...il.com>

Acked-by: Jay Vosburgh <jv@...sburgh.net>

>---
>
>v2: split the patch into 2 parts, the kernel change and test update (Jay Vosburgh)
>
>---
> drivers/net/bonding/bond_main.c | 1 -
> 1 file changed, 1 deletion(-)
>
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index 257333c88710..30cf97f4e814 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -3355,7 +3355,6 @@ static void bond_ns_send_all(struct bonding *bond, struct slave *slave)
> 		/* Find out through which dev should the packet go */
> 		memset(&fl6, 0, sizeof(struct flowi6));
> 		fl6.daddr = targets[i];
>-		fl6.flowi6_oif = bond->dev->ifindex;
> 
> 		dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6);
> 		if (dst->error) {
>-- 
>2.50.1
>