parser: restrict relational rhs expression recursion

The relational expression allows recursion from both sides, this doesn't
allow us to know what hand side the input is coming from. This patch
adds a new expr_rhs rule that specifies what can be found on the
constant side of the relational.

Besides making it easier to understand what is actually supported, this
allows us to use reserve words both as constant and statements. This is
used by the following patch to allow to use redirect as constant from
the icmp payload match.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

0 files changed, 0 insertions, 0 deletions