netdev - Re: [PATCH net-next 1/2] net/ipv6: Handle onlink flag with multipath routes

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Date:   Fri, 16 Mar 2018 11:40:36 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     dsahern@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] net/ipv6: Handle onlink flag with
 multipath routes

From: David Ahern <dsahern@...il.com>
Date: Tue, 13 Mar 2018 08:40:09 -0700

> For multipath routes the ONLINK flag is specified per nexthop in rtnh_flags
> (as opposed to rtm_flags for unicast routes). Update ip6_route_multipath_add
> to set fc_flags based on rtnh_flags.
> 
> Fixes: fc1e64e1092f ("net/ipv6: Add support for onlink flag")
> Signed-off-by: David Ahern <dsahern@...il.com>
> ---
>  net/ipv6/route.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index f0ae58424c45..b223dffa8521 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -4166,6 +4166,7 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
>  				r_cfg.fc_encap_type = nla_get_u16(nla);
>  		}
>  
> +		r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK);
>  		rt = ip6_route_info_create(&r_cfg, extack);
>  		if (IS_ERR(rt)) {
>  			err = PTR_ERR(rt);

Hmmm, this actually "accumulates" the flag rather than sets it.

Have you thought about what should happen if the cfg has RTNH_F_ONLINK
set?

I think you should either change this logic to a true 'set', or adjust
your commit message to address this aspect of the new behavior.

Thank you.