netdev - Re: [PATCH v7 04/22] net/tcp: Prevent TCP-MD5 with TCP-AO being set

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Date: Sun, 18 Jun 2023 10:50:38 -0700
From: David Ahern <dsahern@...nel.org>
To: Dmitry Safonov <dima@...sta.com>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, Jakub Kicinski <kuba@...nel.org>,
 "David S. Miller" <davem@...emloft.net>
Cc: linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...capital.net>,
 Ard Biesheuvel <ardb@...nel.org>, Bob Gilligan <gilligan@...sta.com>,
 Dan Carpenter <error27@...il.com>, David Laight <David.Laight@...lab.com>,
 Dmitry Safonov <0x7f454c46@...il.com>, Donald Cassidy <dcassidy@...hat.com>,
 Eric Biggers <ebiggers@...nel.org>, "Eric W. Biederman"
 <ebiederm@...ssion.com>, Francesco Ruggeri <fruggeri05@...il.com>,
 Herbert Xu <herbert@...dor.apana.org.au>,
 Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
 Ivan Delalande <colona@...sta.com>, Leonard Crestez <cdleonard@...il.com>,
 Salam Noureddine <noureddine@...sta.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v7 04/22] net/tcp: Prevent TCP-MD5 with TCP-AO being set

On 6/14/23 4:09 PM, Dmitry Safonov wrote:
> Be as conservative as possible: if there is TCP-MD5 key for a given peer
> regardless of L3 interface - don't allow setting TCP-AO key for the same
> peer. According to RFC5925, TCP-AO is supposed to replace TCP-MD5 and
> there can't be any switch between both on any connected tuple.
> Later it can be relaxed, if there's a use, but in the beginning restrict
> any intersection.
> 
> Note: it's still should be possible to set both TCP-MD5 and TCP-AO keys
> on a listening socket for *different* peers.

Does the testsuite cover use of both MD5 and AO for a single listening
socket with different peers and then other tests covering attempts to
use both for a same peer?