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Certain kernel modules and thus iptables functionality was introduced at
later releases, so we need to properly reflect that in our default chain
initialization procedure.
`INPUT` chain for `nat` table was introduced with 2.6.36
`ip6table_nat` kernel module for NAT functionality with IPv6 was
introduced with 3.17
This commit implements the required conditional constraints and includes
the rspec tests to validate it.
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Previously it was neither possible to properly define custom chains nor
to define rules in tables other than the default filter table.
For various legitimate reasons it can be required to define rules in the
raw, nat or mangle tables, e.g. to use NOTRACK or to configure
DNAT/SNAT/MASQUERADE.
Additionally it might come in handy to define custom chains to group
certain rules and allow a more efficient evaluation for incoming packets
by not cramming all rules into the filter/INPUT chain so that
(worst-case) all packets need to traverse and evaluate all rules.
I have tried to maintain backwards compatibility and to not change
default filenames/paths so that it won't result in leftover obsolete unmaged
files from previous versions of this module.
In order to improve the naming schema the rule $policy has been renamed
to $action, however both parameters are available and optional now, with
some sanity checks that require at most one of them and issueing a
warning() for users of the now deprecated $policy parameter.
All previous tests have been adapted to the changes, a long with an
additional set of tests for the new feature.
Fixes #61
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Fixes #16. Ubuntu caches rules. This doesn't allow us to reload the
daemon and to apply new rules. Also this is a ubuntu only feature, it
works well on all other platforms without cache.
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