Re: [PATCH net-next] net: ipip: use tunnel parameters for fill_forward_path route lookup

[David Ahern <dsahern@kernel.org>]

On 7/8/26 5:25 AM, Lorenzo Bianconi wrote:
> Pass source address, DSCP and output interface from the tunnel
> configuration to ip_route_output() in ipip_fill_forward_path(), aligning
> the route lookup with the slow path in ipip_tunnel_xmit().
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> ---
>  net/ipv4/ipip.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
> index b643194f57d2..d1aa048a6099 100644
> --- a/net/ipv4/ipip.c
> +++ b/net/ipv4/ipip.c
> @@ -360,8 +360,9 @@ static int ipip_fill_forward_path(struct net_device_path_ctx *ctx,
>  	const struct iphdr *tiph = &tunnel->parms.iph;
>  	struct rtable *rt;
>  
> -	rt = ip_route_output(dev_net(ctx->dev), tiph->daddr, 0, 0, 0,
> -			     RT_SCOPE_UNIVERSE);
> +	rt = ip_route_output(dev_net(ctx->dev), tiph->daddr, tiph->saddr,
> +			     inet_dsfield_to_dscp(tiph->tos),
> +			     tunnel->parms.link, RT_SCOPE_UNIVERSE);
>  	if (IS_ERR(rt))
>  		return PTR_ERR(rt);
>  
> 
> ---
> base-commit: 155c68aef2397f8c5d72ef10acf48ae159bf1869
> change-id: 20260708-ipip-route-lookup-fill_forward_path-6a8a1f45084c
> 
> Best regards,

Reviewed-by: David Ahern <dsahern@kernel.org>