netdev - Re: [PATCH v5 net-next 5/6] ip6tlvs: Add netlink interface

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Date:   Mon, 22 Apr 2019 08:55:31 -0600
From:   David Ahern <dsahern@...il.com>
To:     Tom Herbert <tom@...ntonium.net>
Cc:     Tom Herbert <tom@...bertland.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v5 net-next 5/6] ip6tlvs: Add netlink interface

On 4/22/19 6:33 AM, Tom Herbert wrote:
> 
> 
> On Sun, Apr 21, 2019, 11:43 PM David Ahern <dsahern@...il.com
> <mailto:dsahern@...il.com>> wrote:
> 
>     On 4/19/19 4:36 PM, Tom Herbert wrote:
>     > Add a netlink interface to manage the TX TLV parameters. Managed
>     > parameters include those for validating and sending TLVs being sent
>     > such as alignment, TLV ordering, length limits, etc.
>     >
> 
>     Why generic netlink for managing IPv6 extensions?
> 
> 
> Hi David,
> 
> It allows control over permissions to use specific options. Also, admin
> can add TLVs in the system without requiring specific kernel support.
> The latter in combination with datagram interfaces made bringing up Path
> MTU option at IETF hackathon a breeze (much easier time than FreeBSD
> guys were having :-) ).
> 

Hi Tom: I was asking why can't this be done with rtnetlink? How does the
genl interface make this easier / better?