netdev - Re: [PATCH v2] netfilter: nf_sockopt_find() / nf_register

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Date:	Thu, 31 Jul 2014 12:55:25 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH v2] netfilter: nf_sockopt_find() / nf_register_sockopt()
 should not return EINTR

On Thu, Jul 24, 2014 at 10:41:35PM +0200, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> getsockopt() or setsockopt() sometimes returns -EINTR instead of
> -ENOPROTOOPT, causing headaches to application developers.
> 
> This is because unsupported commands might go through nf_sockopt_find()
> and this function returns -EINTR if a signal is pending.
> 
> Just use non interruptible mutex functions, as there is no reason
> we should sleep for a long time here.

On top of this patch, I think that at least we can also ged rid of
these interruptible mutex from the netfilter/core code too (see
preliminary patch attached).

I can also adapt the callers so they don't check anymore the return
value as they will always succeed.

Comments? Thanks.

View attachment "x.patch" of type "text/x-diff" (849 bytes)