parser_bison: allow to use variable to add/create/delete elements

Using variable definitions from element command doesn't work, eg.

-test.nft-
 define whitelist_v4 = { 1.1.1.1 }
 table inet filter {
	set whitelist_v4 { type ipv4_addr; }
 }
 add element inet filter whitelist_v4 $whitelist_v4
-EOF-

 # nft -f test.nft
 test.nft:7:38-38: Error: syntax error, unexpected '$', expecting '{'
 add element inet filter whitelist_v4 $whitelist_v4
                                      ^

Fix this by using set_block_expr rule for every element command.
This patch also comes with a new regression test.

Reported-by: Leon Merten Lohse <leon@green-side.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/tests/shell/testcases/nft-f/0010variable_0 b/tests/shell/testcases/nft-f/0010variable_0
new file mode 100755
index 00000000..2df71b13
--- /dev/null
+++ b/tests/shell/testcases/nft-f/0010variable_0
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -e
+
+tmpfile=$(mktemp)
+if [ ! -w $tmpfile ] ; then
+        echo "Failed to create tmp file" >&2
+        exit 0
+fi
+
+trap "rm -rf $tmpfile" EXIT # cleanup if aborted
+
+RULESET="define whitelist_v4 = { 1.1.1.1 }
+
+table inet filter {
+	set whitelist_v4 { type ipv4_addr; }
+}
+add element inet filter whitelist_v4 \$whitelist_v4
+"
+
+echo "$RULESET" > $tmpfile
+$NFT -f $tmpfile