netdev - Re: [PATCH] SCTP: Reduce log spamming for sctp setsockopt

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Message-ID: <1387207301.18217.30.camel@joe-AO722>
Date:	Mon, 16 Dec 2013 07:21:41 -0800
From:	Joe Perches <joe@...ches.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	Neil Horman <nhorman@...driver.com>, linux-sctp@...r.kernel.org,
	Vlad Yasevich <vyasevich@...il.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] SCTP: Reduce log spamming for sctp setsockopt

On Mon, 2013-12-16 at 16:13 +0100, Daniel Borkmann wrote:
> On 12/16/2013 04:03 PM, Joe Perches wrote:
> > On Mon, 2013-12-16 at 09:44 -0500, Neil Horman wrote:
> >> During a recent discussion regarding some sctp socket options, it was noted that
> >> we have several points at which we issue log warnings that can be flooded at an
> >> unbounded rate by any user.  Fix this by converting all the pr_warns in the
> >> sctp_setsockopt path to be pr_warn_ratelimited.
> >
> > trivial note:
> [...]
> >> @@ -5311,8 +5311,8 @@ static int sctp_getsockopt_maxburst(struct sock *sk, int len,
> > []
> >> +		pr_warn_ratelimited("Use of int in max_burst socket option deprecated\n");
> >> +		pr_warn_ratelimited("Use struct sctp_assoc_value instead\n");
> >
> > Perhaps a dedicated "deprecated" warning function
> > to centralize these?
> >
> > void _sctp_warn_deprecated(const char *func, const char *from, const char *to);
> > {
> > 	etc.
> > }
> > #define sctp_warn_deprecated(from, to)		\
> > 	_sctp_warn_deprecated(__func__, from, to)
> 
> If so, then this should better get even more "centralized" ... as e.g.
> pr_warn_deprecated() [which internally is ratelimited]. I don't see the
> point why only SCTP should have this special-cased.

Sure, if it's useful outside of sctp, but I didn't
notice any other uses like it.

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