netdev - Re: tc ipt action

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Message-ID: <alpine.LNX.2.01.1212161815310.27614@nerf07.vanv.qr>
Date:	Sun, 16 Dec 2012 18:21:08 +0100 (CET)
From:	Jan Engelhardt <jengelh@...i.de>
To:	Jamal Hadi Salim <jhs@...atatu.com>
cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	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 11:43, Jamal Hadi Salim wrote:

> On 12-12-15 07:59 PM, Jan Engelhardt wrote:
>>
>
>> 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(...)
>> 	...
>>
>
> I think you are suggesting this to be done in tc. That would make it easier to
> fix.
> IMO, it is easier to keep backward compat if you left the old
> APIs around for a period of time

As you can see, the old ->parse() that goes back to libxtables.so.0
still remains. It's just that... only 5 out of 99 plugins still come
with an old parse function.

	[m_xt] -> [libxtables] <- (plugins: libxt_*.so)

> and maybe log a warning that they
> will be deprecated over a period of time (sort of like kernel approach to
> changing APIs).

old parse has not entered any deprecation stage yet, since there are still
plugins out there (both the 5 and external ones) that make use of it.
Right now, both parse and x6_parse are valid.

> BTW: another interface that seems to have changed that we
> need is m->final_check().

Yes, all those with an x6_ prefix are new.
Mh, I already dream of plans reducing m_xt to something that
does not require libxtables.so anymore.
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