linux-kernel - Re: [PATCH 0/1] net: ioctl: Use kernel buffer on proto ioctl callbacks

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Message-ID: <ZGeTbsnCZtkewPzu@gmail.com>
Date:   Fri, 19 May 2023 08:19:10 -0700
From:   Breno Leitao <leitao@...ian.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     axboe@...nel.dk, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, willemdebruijn.kernel@...il.com,
        courmisch@...il.com, nhorman@...driver.com, asml.silence@...il.com,
        alex.aring@...il.com, dccp@...r.kernel.org, mptcp@...ts.linux.dev,
        linux-kernel@...r.kernel.org, matthieu.baerts@...sares.net,
        marcelo.leitner@...il.com, linux-wpan@...r.kernel.org,
        linux-sctp@...r.kernel.org, leit@...com, David.Laight@...lab.com,
        dsahern@...nel.org
Subject: Re: [PATCH 0/1] net: ioctl: Use kernel buffer on proto ioctl
 callbacks

On Fri, May 19, 2023 at 08:15:26AM -0700, Jakub Kicinski wrote:
> On Fri, 19 May 2023 06:58:20 -0700 Breno Leitao wrote:
> > With the implementation of network ioctl on io_uring[1], Willem
> > suggested[2] that the "struct proto" ioctls functions should be reused,
> > instead of duplicating the code.
> > For that, the ioctl callbacks need to be more flexible, and avoid
> > operating on userspace buffers (doing get/put_user()) directly on the
> > callbacks. This patch adds this flexibility, so, the io_uring plumbing
> > becomes more clean, avoiding duplicating code. This may also benefit
> > BPF.
> > 
> > For that, a wrapper is created, which will copy from/to userspace, and
> > the ioctl callback will rely on the wrapper to do userspace memory
> > copies.
> > 
> > I've tested this patch in three different ways:
> > 1) Created a simple testcase for TCP/UDP [3]
> > 2) Run relevant LTP tests, such as: sockioctl, setsockopt, bind, sendto,
> > 				    fanout, ns-udpsender, etc
> > 3) Run basics network selftests
> > 
> > PS: There are some `strcmp()` in the `sock_skprot_ioctl()`, that I was
> > not able to find a better way to deal with it. Any feedback is
> > appreciated.
> 
> Why not CC netdev@ on this?

Oops, my mistake. I will do it on V2.