netdev - Re: [PATCH 32/33] net: add a new bind

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Message-ID: <20200521135443.GY2491@localhost.localdomain>
Date:   Thu, 21 May 2020 10:54:43 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Jon Maloy <jmaloy@...hat.com>,
        Ying Xue <ying.xue@...driver.com>, drbd-dev@...ts.linbit.com,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-nvme@...ts.infradead.org, target-devel@...r.kernel.org,
        linux-afs@...ts.infradead.org, linux-cifs@...r.kernel.org,
        cluster-devel@...hat.com, ocfs2-devel@....oracle.com,
        netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        ceph-devel@...r.kernel.org, rds-devel@....oracle.com,
        linux-nfs@...r.kernel.org
Subject: Re: [PATCH 32/33] net: add a new bind_add method

On Thu, May 21, 2020 at 10:42:24AM +0200, Christoph Hellwig wrote:
> On Wed, May 20, 2020 at 08:00:25PM -0300, Marcelo Ricardo Leitner wrote:
> > > +	if (err)
> > > +		return err;
> > > +
> > > +	lock_sock(sk);
> > > +	err = sctp_do_bind(sk, (union sctp_addr *)addr, af->sockaddr_len);
> > > +	if (!err)
> > > +		err = sctp_send_asconf_add_ip(sk, addr, 1);
> > 
> > Some problems here.
> > - addr may contain a list of addresses
> > - the addresses, then, are not being validated
> > - sctp_do_bind may fail, on which it requires some undoing
> >   (like sctp_bindx_add does)
> > - code duplication with sctp_setsockopt_bindx.
> 
> sctp_do_bind and thus this function only support a single address, as
> that is the only thing that the DLM code requires.  I could move the

I see.

> user copy out of sctp_setsockopt_bindx and reuse that, but it is a
> rather rcane API.

Yes. With David's patch, which is doing that, it can be as simple as:

static int sctp_bind_add(struct sock *sk, struct sockaddr *addr,
               int addrlen)
{
	int ret;
	lock_sock(sk);
	ret = sctp_setsockopt_bindx(sk, addr, addrlen, SCTP_BINDX_ADD_ADDR);
	release_sock(sk);
	return ret;
}

and then dlm would be using code that we can test through sctp-only tests as
well.

> 
> > 
> > This patch will conflict with David's one,
> > [PATCH net-next] sctp: Pull the user copies out of the individual sockopt functions.
> 
> Do you have a link?  A quick google search just finds your mail that
> I'm replying to.

https://lore.kernel.org/netdev/fd94b5e41a7c4edc8f743c56a04ed2c9%40AcuMS.aculab.com/T/

> 
> > (I'll finish reviewing it in the sequence)
> > 
> > AFAICT, this patch could reuse/build on his work in there. The goal is
> > pretty much the same and would avoid the issues above.
> > 
> > This patch could, then, point the new bind_add proto op to the updated
> > sctp_setsockopt_bindx almost directly.
> > 
> > Question then is: dlm never removes an addr from the bind list. Do we
> > want to add ops for both? Or one that handles both operations?
> > Anyhow, having the add operation but not the del seems very weird to
> > me.
> 
> We generally only add operations for things that we actually use.
> bind_del is another logical op, but we can trivially add that when we
> need it.

Right, okay.