ip_policies.py 文件源码

def ensure_default_policy(cidrs, subnets):
    policy_cidrs = netaddr.IPSet(cidrs)
    for subnet in subnets:
        subnet_cidr = netaddr.IPNetwork(subnet["cidr"])
        network_ip = subnet_cidr.network
        broadcast_ip = subnet_cidr.broadcast
        prefix_len = '32' if subnet_cidr.version == 4 else '128'
        default_policy_cidrs = ["%s/%s" % (network_ip, prefix_len),
                                "%s/%s" % (broadcast_ip, prefix_len)]
        for cidr in default_policy_cidrs:
            if (netaddr.IPNetwork(cidr) not in policy_cidrs
                    and cidr not in cidrs):
                cidrs.append(cidr)