netdev - Re: [PATCH 00/31] net/tcp: Add TCP-AO support

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Date:   Wed, 24 Aug 2022 10:55:47 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Leonard Crestez <cdleonard@...il.com>,
        Dmitry Safonov <dima@...sta.com>,
        David Ahern <dsahern@...nel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Bob Gilligan <gilligan@...sta.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Eric Biggers <ebiggers@...nel.org>,
        Francesco Ruggeri <fruggeri@...sta.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Ivan Delalande <colona@...sta.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Salam Noureddine <noureddine@...sta.com>,
        Shuah Khan <shuah@...nel.org>, netdev@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH 00/31] net/tcp: Add TCP-AO support

On Wed, 24 Aug 2022 14:46:32 +0200 Andrew Lunn wrote:
> > I think it would make sense to push key validity times and the key selection
> > policy entirely in the kernel so that it can handle key rotation/expiration
> > by itself. This way userspace only has to configure the keys and doesn't
> > have to touch established connections at all.  
> 
> I know nothing aobut TCP-AO, nor much about kTLS. But doesn't kTLS
> have the same issue? Is there anything which can be learnt from kTLS?
> Maybe the same mechanisms can be used? No point inventing something
> new if you can copy/refactor working code?

kTLS does not support key rotation FWIW. It's extremely rare.

> > My series has a "flags" field on the key struct where it can filter by IP,
> > prefix, ifindex and so on. It would be possible to add additional flags for
> > making the key only valid between certain times (by wall time).  
> 
> What out for wall clock time, it jumps around in funny ways. Plus the
> kernel has no idea what time zone the wall the wall clock is mounted
> on is in.

I'd do all of this over netlink, next-gen crypto on sockets is *the*
reason I started the YAML work. Sadly my crypto config via netlink
does not exist yet and is probably 2mo out ;(