tests: add regression tests for xtables-translate

This test suite is intended to detect regressions in the translation
infrastructure. The script checks if ip[6]tables-translate produces the
expected output, otherwise it prints the wrong translation and the
expected one.

** Arguments

  --all     # Show also passed tests
  [test]    # Run only the specified test file

** Test files structure

Test files are located under extensions directory. Every file contains
tests about specific extension translations. A test file name must end
with ".txlate".

Inside the files, every single test is defined by two consecutive lines:
ip[6]tables-translate command and expected result. One blank line is left
between tests by convention.

e.g.

  $ cat extensions/libxt_cpu.txlate
  iptables-translate -A INPUT -p tcp --dport 80 -m cpu --cpu 0 -j ACCEPT
  nft add rule ip filter INPUT tcp dport 80 cpu 0 counter accept

  iptables-translate -A INPUT -p tcp --dport 80 -m cpu ! --cpu 1 -j ACCEPT
  nft add rule ip filter INPUT tcp dport 80 cpu != 1 counter accept

Signed-off-by: Pablo M. Bermudo Garay <pablombg@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/extensions/libxt_cgroup.txlate b/extensions/libxt_cgroup.txlate
new file mode 100644
index 00000000..75f2e6ae
--- /dev/null
+++ b/extensions/libxt_cgroup.txlate
@@ -0,0 +1,5 @@
+iptables-translate -t filter -A INPUT -m cgroup --cgroup 0 -j ACCEPT
+nft add rule ip filter INPUT meta cgroup 0 counter accept
+
+iptables-translate -t filter -A INPUT -m cgroup ! --cgroup 0 -j ACCEPT
+nft add rule ip filter INPUT meta cgroup != 0 counter accept