[PATCH nft] evaluate: element key cannot in map cannot be a set

[Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>]

 # cat x.nft
 define lala = { eth0, eth1 }

 table ip x {
        chain y {
                iifname vmap { lo : accept, $lala : drop }
        }
 }
 # nft -f x.nft
 x.nft:5:16-44: Error: Could not process rule: Invalid argument
                iifname vmap { lo : accept, $lala : drop }
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

instead:

 x.nft:1:15-28: Error: Element key in map cannot be a set
 define lala = { eth0, eth1 }
               ^^^^^^^^^^^^^^

Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
 src/evaluate.c | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/src/evaluate.c b/src/evaluate.c
index 8b5f51cee01c..110a40413c1c 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -1395,16 +1395,23 @@ static int expr_evaluate_set_elem(struct eval_ctx *ctx, struct expr **expr)
 	if (expr_evaluate(ctx, &elem->key) < 0)
 		return -1;
 
-	if (ctx->set &&
-	    !(ctx->set->flags & (NFT_SET_ANONYMOUS | NFT_SET_INTERVAL))) {
-		switch (elem->key->etype) {
-		case EXPR_PREFIX:
-		case EXPR_RANGE:
-			return expr_error(ctx->msgs, elem,
-					  "You must add 'flags interval' to your %s declaration if you want to add %s elements",
-					  set_is_map(ctx->set->flags) ? "map" : "set", expr_name(elem->key));
-		default:
-			break;
+	if (ctx->set) {
+		if (!(ctx->set->flags & (NFT_SET_ANONYMOUS | NFT_SET_INTERVAL))) {
+			switch (elem->key->etype) {
+			case EXPR_PREFIX:
+			case EXPR_RANGE:
+				return expr_error(ctx->msgs, elem,
+						  "You must add 'flags interval' to your %s declaration if you want to add %s elements",
+						  set_is_map(ctx->set->flags) ? "map" : "set", expr_name(elem->key));
+				break;
+			default:
+				break;
+			}
+		}
+		if (set_is_map(ctx->set->flags) &&
+		    elem->key->etype == EXPR_SET) {
+			return expr_error(ctx->msgs, elem->key,
+					  "Element key in map cannot be a set");
 		}
 	}
 
-- 
2.20.1