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OpenStack Study: net_util.py**** CubicPower OpenStack Study **** def subnet_str(cidr): """Convert the cidr string to x.x.x.x_y format :param cidr: CIDR in x.x.x.x/y format """ if cidr is None: return None return cidr.replace("/", "_")
**** CubicPower OpenStack Study **** def net_addr(addr): """Get network address prefix and length from a given address.""" if addr is None: return (None, None) nw_addr, nw_len = addr.split('/') nw_len = int(nw_len) return nw_addr, nw_len
**** CubicPower OpenStack Study **** def get_ethertype_value(ethertype): """Convert string representation of ethertype to the numerical.""" if ethertype is None: return None mapping = { 'ipv4': 0x0800, 'ipv6': 0x86DD, 'arp': 0x806 } return mapping.get(ethertype.lower())
**** CubicPower OpenStack Study **** def get_protocol_value(protocol): """Convert string representation of protocol to the numerical.""" if protocol is None: return None if isinstance(protocol, int): return protocol mapping = { constants.PROTO_NAME_TCP: constants.PROTO_NUM_TCP, constants.PROTO_NAME_UDP: constants.PROTO_NUM_UDP, constants.PROTO_NAME_ICMP: constants.PROTO_NUM_ICMP } return mapping.get(protocol.lower())
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