netdev - Re: [PATCH net-next v3 1/2] mpls: allow TTL propagation to IP packets to be configured

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Date:   Mon, 13 Mar 2017 12:42:44 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Robert Shearman <rshearma@...cade.com>, davem@...emloft.net
Cc:     netdev@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        roopa <roopa@...ulusnetworks.com>
Subject: Re: [PATCH net-next v3 1/2] mpls: allow TTL propagation to IP packets
 to be configured

On 3/10/17 1:43 PM, Robert Shearman wrote:
> Provide the ability to control on a per-route basis whether the TTL
> value from an MPLS packet is propagated to an IPv4/IPv6 packet when
> the last label is popped as per the theoretical model in RFC 3443
> through a new route attribute, RTA_TTL_PROPAGATE which can be 0 to
> mean disable propagation and 1 to mean enable propagation.
> 
> In order to provide the ability to change the behaviour for packets
> arriving with IPv4/IPv6 Explicit Null labels and to provide an easy
> way for a user to change the behaviour for all existing routes without
> having to reprogram them, a global knob is provided. This is done
> through the addition of a new per-namespace sysctl,
> "net.mpls.ip_ttl_propagate", which defaults to enabled. If the
> per-route attribute is set (either enabled or disabled) then it
> overrides the global configuration.
> 
> Signed-off-by: Robert Shearman <rshearma@...cade.com>
> ---
>  Documentation/networking/mpls-sysctl.txt | 11 ++++
>  include/net/netns/mpls.h                 |  2 +
>  include/uapi/linux/rtnetlink.h           |  1 +
>  net/mpls/af_mpls.c                       | 87 +++++++++++++++++++++++++++++---
>  net/mpls/internal.h                      |  7 +++
>  5 files changed, 100 insertions(+), 8 deletions(-)

Acked-by: David Ahern <dsa@...ulusnetworks.com>
Tested-by: David Ahern <dsa@...ulusnetworks.com>