src: simplify getter logic

This patch refactors the getter code to simplify it. The default
cases have been removed so gcc will spot a warning if an attribute
is not handled appropriately.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/expr.c b/src/expr.c
index 711c18e..d2d345c 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -114,6 +114,9 @@ const void *nft_rule_expr_get(const struct nft_rule_expr *expr, uint16_t type, s
 		ret = expr->ops->name;
 		break;
 	default:
+		if (!(expr->flags & (1 << type)))
+			return NULL;
+
 		ret = expr->ops->get(expr, type, data_len);
 		break;
 	}