src: Allow goto and jump to a variable

This patch introduces the use of nft input files variables in 'jump' and 'goto'
statements, e.g.

define dest = ber

add table ip foo
add chain ip foo bar {type filter hook input priority 0;}
add chain ip foo ber
add rule ip foo ber counter
add rule ip foo bar jump $dest

table ip foo {
        chain bar {
                type filter hook input priority filter; policy accept;
                jump ber
        }

        chain ber {
                counter packets 71 bytes 6664
        }
}

Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/parser_bison.y b/src/parser_bison.y
index f2583ade..62e76fe6 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -3841,7 +3841,8 @@ verdict_expr		:	ACCEPT
 			}
 			;
 
-chain_expr		:	identifier
+chain_expr		:	variable_expr
+			|	identifier
 			{
 				$$ = constant_expr_alloc(&@$, &string_type,
 							 BYTEORDER_HOST_ENDIAN,