[PATCH nft] evaluate: error reporting for missing statements in set/map declaration

[Pablo Neira Ayuso <pablo@netfilter.org>]

Assuming this map:

        map y {
                type ipv4_addr : verdict
        }

This patch slightly improves error reporting to refer to the missing
'counter' statement in the map declaration.

 # nft 'add element x y { 1.2.3.4 counter packets 1 bytes 1 : accept, * counter : drop }'
 Error: missing statement in map declaration
 add element x y { 1.2.3.4 counter packets 10 bytes 640 : accept, * counter : drop }
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 src/evaluate.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/evaluate.c b/src/evaluate.c
index 98309ea83ac0..4609576b2a61 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -1351,10 +1351,12 @@ static int __expr_evaluate_set_elem(struct eval_ctx *ctx, struct expr *elem)
 					  "but element has %d", num_set_exprs,
 					  num_elem_exprs);
 		} else if (num_set_exprs == 0) {
-			if (!(set->flags & NFT_SET_EVAL))
-				return expr_error(ctx->msgs, elem,
-						  "missing statements in %s definition",
+			if (!(set->flags & NFT_SET_EVAL)) {
+				elem_stmt = list_first_entry(&elem->stmt_list, struct stmt, list);
+				return stmt_error(ctx, elem_stmt,
+						  "missing statement in %s declaration",
 						  set_is_map(set->flags) ? "map" : "set");
+			}
 			return 0;
 		}
 
-- 
2.20.1