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This patch adds the following utilities:
* xtables
* xtables-restore
* xtables-save
* xtables-config
They all use Patrick's nf_tables infrastructure plus my compatibility
layer.
xtables, xtables-restore and xtables-save are syntax compatible with
ip[6]tables, ip[6]tables-restore and ip[6]tables-save.
Semantics aims to be similar, still the main exception is that there
is no commit operation. Thus, we incrementally add/delete rules without
entire table locking.
The following options are also not yet implemented:
-Z (this requires adding expr->ops->reset(...) so nft_counters can reset
internal state of expressions while dumping it)
-R and -E (this requires adding this feature to nf_tables)
-f (can be implemented with expressions: payload 6 (2-bytes) + bitwise a&b^!b + cmp neq 0)
-IPv6 support.
But those are a matter of time to get them done.
A new utility, xtables-config, is available to register tables and
chains. By default there is a configuration file that adds backward
compatible tables and chains under iptables/etc/xtables.conf. You have
to call this utility first to register tables and chains.
However, it would be possible to automagically register tables and
chains while using xtables and xtables-restore to get similar operation
than with iptables.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Pablo suggested to make it depend on lnf-conntrack, and get rid of
the example config file as well.
The problem is that the file must be in a fixed path,
/etc/xtables/connlabel.conf, else userspace needs to "guess-the-right-file"
when translating names to their bit values (and vice versa).
Originally "make install" did put an example file into /etc/xtables/,
but distributors complained about iptables ignoring the sysconfdir.
So rather remove the example file, the man-page explains the format,
and connlabels are inherently system-specific anyway.
Signed-off-by: Florian Westphal <fw@strlen.de>
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allows to "tag" connections with up to 128 label names.
Labels are defined in /etc/xtables/connlabel.conf, example:
0 from eth0
1 via eth0
Labels can then be attached to flows, e.g.
-A PREROUTING -i eth0 -m connlabel --label "from eth0" --set
Signed-off-by: Florian Westphal <fw@strlen.de>
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