netdev - Re: [PATCH net-next v3] openvswitch: add TTL decrement action

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Message-ID: <CAGnkfhy=GtFzwEUabfnZ9L7q3D0PHjUmntKxD6bQGk6vqrwcZQ@mail.gmail.com>
Date:   Fri, 17 Jan 2020 14:58:45 +0100
From:   Matteo Croce <mcroce@...hat.com>
To:     Jeremy Harris <jgh@...hat.com>
Cc:     netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v3] openvswitch: add TTL decrement action

On Fri, Jan 17, 2020 at 2:44 PM Jeremy Harris <jgh@...hat.com> wrote:
>
> On 15/01/2020 16:40, Matteo Croce wrote:
> > New action to decrement TTL instead of setting it to a fixed value.
> > This action will decrement the TTL and, in case of expired TTL, drop it
> > or execute an action passed via a nested attribute.
> > The default TTL expired action is to drop the packet.
>
> On drop, will it emit an ICMP?
> --
> Cheers,
>   Jeremy
>

No, drop will silently drop it.

But if you add an action which sends the packet to userspace, the
controller can send an ICMP TTL exceeded response.

-- 
Matteo Croce
per aspera ad upstream