src: allow for variables in the log prefix string

For example:

 define test = "state"
 define foo = "match"

 table x {
        chain y {
                ct state invalid log prefix "invalid $test $foo:"
        }
 }

This patch scans for variables in the log prefix string. The log prefix
expression is a list of constant and variable expression that are
converted into a constant expression from the evaluation phase.

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

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/shell/testcases/optionals/log_prefix_0 b/tests/shell/testcases/optionals/log_prefix_0
new file mode 100755
index 00000000..513a9e74
--- /dev/null
+++ b/tests/shell/testcases/optionals/log_prefix_0
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -e
+
+TMP=$(mktemp)
+
+RULESET='define test = "state"
+define foo = "match, logging"
+
+table x {
+        chain y {
+                ct state invalid log prefix "invalid $test $foo:"
+        }
+}'
+
+$NFT -f - <<< "$RULESET"