[PATCH nft 02/12] evaluate: transfer right shifts to range side

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

This provides a generic way to transfer shifts from the left hand side
to the right hand range side of a relational expression when performing
transformations from the evaluation step.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 src/evaluate.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/evaluate.c b/src/evaluate.c
index f862cd0..60bbce1 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -1146,6 +1146,18 @@ static int binop_transfer(struct eval_ctx *ctx, struct expr **expr)
 		if (binop_transfer_one(ctx, left, &(*expr)->right) < 0)
 			return -1;
 		break;
+	case EXPR_RANGE:
+		err = binop_can_transfer(ctx, left, (*expr)->right->left);
+		if (err <= 0)
+			return err;
+		err = binop_can_transfer(ctx, left, (*expr)->right->right);
+		if (err <= 0)
+			return err;
+		if (binop_transfer_one(ctx, left, &(*expr)->right->left) < 0)
+			return -1;
+		if (binop_transfer_one(ctx, left, &(*expr)->right->right) < 0)
+			return -1;
+		break;
 	case EXPR_SET:
 		list_for_each_entry(i, &(*expr)->right->expressions, list) {
 			err = binop_can_transfer(ctx, left, i);
-- 
2.1.4