netdev - Re: tc ipt action

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Message-ID: <alpine.LNX.2.01.1212160144110.26218@nerf07.vanv.qr>
Date:	Sun, 16 Dec 2012 01:59:33 +0100 (CET)
From:	Jan Engelhardt <jengelh@...i.de>
To:	Pablo Neira Ayuso <pablo@...filter.org>
cc:	Jamal Hadi Salim <jhs@...atatu.com>,
	Yury Stankevich <urykhy@...il.com>, shemonc@...il.com,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	netfilter-devel@...r.kernel.org
Subject: Re: tc ipt action


On Sunday 2012-12-16 01:27, Pablo Neira Ayuso wrote:
>On Sat, Dec 15, 2012 at 04:19:29PM -0500, Jamal Hadi Salim wrote:
>> Example, the following should work for
>> tc filter add dev eth0 parent ffff: protocol ip u32 match u32 0 0
>> action ipt -j CONNMARK \
>> action mirred egress redirect dev ifb0
>> 
>commit 7299fa4b615d7f7ee12cde444266f6b31f667f9f
>    libxt_CONNMARK: use guided option parser
>
>BTW, I think it would be good if we find the way to check for
>libxtables current version (see iptables/configure.ac), so you can
>know that we broke binary compatibility again.

For the C level, there is XTABLES_VERSION_CODE.

#if XTABLES_VERSION_CODE >= 6
	if (m != NULL && m->x6_parse != NULL)
		m->x6_parse(...)
#else
	else if (m != NULL && m->parse != NULL)
		m->parse(...)
	...

We can also export this through pkgconfig, similar to how
downstream users are to discover the plugin dir
(`pkg-config xtables --variable libdir`).
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