netdev - Re: [PATCH net-next] ipv6: Reject routes configurations that specify dsfield (tos)

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Message-ID: <6952fd74-0202-47ed-a0f8-4b776bdf3ff2@gmail.com>
Date:   Thu, 10 Feb 2022 10:11:05 -0800
From:   David Ahern <dsahern@...il.com>
To:     Guillaume Nault <gnault@...hat.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: [PATCH net-next] ipv6: Reject routes configurations that specify
 dsfield (tos)

On 2/10/22 7:08 AM, Guillaume Nault wrote:
> The ->rtm_tos option is normally used to route packets based on both
> the destination address and the DS field. However it's ignored for
> IPv6 routes. Setting ->rtm_tos for IPv6 is thus invalid as the route
> is going to work only on the destination address anyway, so it won't
> behave as specified.
> 
> Suggested-by: Toke Høiland-Jørgensen <toke@...hat.com>
> Signed-off-by: Guillaume Nault <gnault@...hat.com>
> ---
> The same problem exists for ->rtm_scope. I'm working only on ->rtm_tos
> here because IPv4 recently started to validate this option too (as part
> of the DSCP/ECN clarification effort).
> I'll give this patch some soak time, then send another one for
> rejecting ->rtm_scope in IPv6 routes if nobody complains.
> 
>  net/ipv6/route.c                         |  6 ++++++
>  tools/testing/selftests/net/fib_tests.sh | 13 +++++++++++++
>  2 files changed, 19 insertions(+)
> 


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