tests: shell: add a new testcase for ruleset loading bug

There seems to be a bug that prevent loading a ruleset twice in a row
if the ruleset contains sets with intervals. This seems related to the
nft cache.

By the time of this commit, the bug is not fixed yet.

Signed-off-by: Arturo Borrero Gonzalez <arturo@debian.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/tests/shell/testcases/cache/0002_interval_0 b/tests/shell/testcases/cache/0002_interval_0
new file mode 100755 (executable)
index 0000000..f500911
--- /dev/null
+++ b/tests/shell/testcases/cache/0002_interval_0
@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# This testcase checks that we can load a ruleset twice in a row.
+# bug --> Error: interval overlaps with an existing one
+
+set -e
+
+tmpfile=$(mktemp)
+if [ ! -w $tmpfile ] ; then
+        echo "Failed to create tmp file" >&2
+        exit 0
+fi
+
+trap "rm -rf $tmpfile" EXIT # cleanup if aborted
+
+RULESET="flush ruleset
+table inet t {
+       set s { type ipv4_addr; flags interval; }
+}
+
+add element inet t s {
+       192.168.0.1/24,
+}"
+
+echo "$RULESET" > $tmpfile
+$NFT -f $tmpfile
+$NFT -f $tmpfile