If a user uses a variable payload expression in a payload statement, we
need to undo any munging during delinearization.
Signed-off-by: Jeremy Sowden <jeremy@xxxxxxxxxx>
---
src/netlink_delinearize.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/src/netlink_delinearize.c b/src/netlink_delinearize.c
index 571cab1d932b..73faa93c862e 100644
--- a/src/netlink_delinearize.c
+++ b/src/netlink_delinearize.c
@@ -2125,6 +2125,30 @@ static void relational_binop_postprocess(struct rule_pp_ctx *ctx, struct expr *e
}
}
+static bool payload_binop_postprocess(struct rule_pp_ctx *ctx, struct expr **exprp)
+{
+ struct expr *expr = *exprp;
+
+ if (expr->op != OP_RSHIFT)
+ return false;
+
+ if (expr->left->etype != EXPR_BINOP || expr->left->op != OP_AND)
+ return false;
+
+ if (expr->left->left->etype != EXPR_PAYLOAD)
+ return false;
+
+ expr_set_type(expr->right, &integer_type,
+ BYTEORDER_HOST_ENDIAN);
+ expr_postprocess(ctx, &expr->right);
+
+ binop_postprocess(ctx, expr);
+ *exprp = expr_get(expr->left);
+ expr_free(expr);
+
+ return true;
+}
+
static struct expr *string_wildcard_expr_alloc(struct location *loc,
const struct expr *mask,
const struct expr *expr)
@@ -2258,6 +2282,9 @@ static void expr_postprocess(struct rule_pp_ctx *ctx, struct expr **exprp)
expr_set_type(expr, expr->arg->dtype, !expr->arg->byteorder);
break;
case EXPR_BINOP:
+ if (payload_binop_postprocess(ctx, exprp))
+ break;
+
expr_postprocess(ctx, &expr->left);
switch (expr->op) {
case OP_LSHIFT:
--
2.25.1
