Security group rule for multiple SGs

multi_sg_rule.tf

resource "aws_security_group_rule" "allow_all" {
    count = "${length(split(",", var.security_group_ids))}"
    
    type = "ingress"
    from_port = 0
    to_port = 65535
    protocol = "tcp"
    cidr_blocks = ["0.0.0.0/0"]

    security_group_id = "${element(split(",", var.security_group_ids), count.index)}"
}