tree 81951e3cb17713cd0cedfec9d4d3823d3fe264f5
parent a7d51738e757c1ab94595e7d05594c61f0fb32ce
author Jan Engelhardt <jengelh@medozas.de> 1247172893 +0200
committer Jan Engelhardt <jengelh@medozas.de> 1249904129 +0200

netfilter: xtables: check for unconditionality of policies

This adds a check that iptables's original author Rusty set forth in
a FIXME comment.

Underflows in iptables are better known as chain policies, and are
required to be unconditional or there would be a stochastical chance
for the policy rule to be skipped if it does not match. If that were
to happen, rule execution would continue in an unexpected spurious
fashion.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>